diff options
Diffstat (limited to 'drivers/char')
| -rw-r--r-- | drivers/char/Kconfig | 2 | ||||
| -rw-r--r-- | drivers/char/Makefile | 13 | ||||
| -rw-r--r-- | drivers/char/hvc_beat.c | 134 | ||||
| -rw-r--r-- | drivers/char/hvc_console.c | 914 | ||||
| -rw-r--r-- | drivers/char/hvc_console.h | 119 | ||||
| -rw-r--r-- | drivers/char/hvc_dcc.c | 133 | ||||
| -rw-r--r-- | drivers/char/hvc_irq.c | 49 | ||||
| -rw-r--r-- | drivers/char/hvc_iseries.c | 598 | ||||
| -rw-r--r-- | drivers/char/hvc_iucv.c | 1337 | ||||
| -rw-r--r-- | drivers/char/hvc_rtas.c | 133 | ||||
| -rw-r--r-- | drivers/char/hvc_tile.c | 68 | ||||
| -rw-r--r-- | drivers/char/hvc_udbg.c | 96 | ||||
| -rw-r--r-- | drivers/char/hvc_vio.c | 173 | ||||
| -rw-r--r-- | drivers/char/hvc_xen.c | 271 | ||||
| -rw-r--r-- | drivers/char/hvcs.c | 1604 | ||||
| -rw-r--r-- | drivers/char/hvsi.c | 1314 | ||||
| -rw-r--r-- | drivers/char/virtio_console.c | 1838 |
17 files changed, 1 insertions, 8795 deletions
diff --git a/drivers/char/Kconfig b/drivers/char/Kconfig index 4237602fd4c..b7980a83ce2 100644 --- a/drivers/char/Kconfig +++ b/drivers/char/Kconfig @@ -426,7 +426,7 @@ config SGI_MBCS If you have an SGI Altix with an attached SABrick say Y or M here, otherwise say N. -source "drivers/serial/Kconfig" +source "drivers/tty/serial/Kconfig" config UNIX98_PTYS bool "Unix98 PTY support" if EXPERT diff --git a/drivers/char/Makefile b/drivers/char/Makefile index 1e9dffb3377..5bc765d4c3c 100644 --- a/drivers/char/Makefile +++ b/drivers/char/Makefile @@ -30,25 +30,12 @@ obj-$(CONFIG_SYNCLINK_GT) += synclink_gt.o obj-$(CONFIG_AMIGA_BUILTIN_SERIAL) += amiserial.o obj-$(CONFIG_SX) += sx.o generic_serial.o obj-$(CONFIG_RIO) += rio/ generic_serial.o -obj-$(CONFIG_HVC_CONSOLE) += hvc_vio.o hvsi.o -obj-$(CONFIG_HVC_ISERIES) += hvc_iseries.o -obj-$(CONFIG_HVC_RTAS) += hvc_rtas.o -obj-$(CONFIG_HVC_TILE) += hvc_tile.o -obj-$(CONFIG_HVC_DCC) += hvc_dcc.o -obj-$(CONFIG_HVC_BEAT) += hvc_beat.o -obj-$(CONFIG_HVC_DRIVER) += hvc_console.o -obj-$(CONFIG_HVC_IRQ) += hvc_irq.o -obj-$(CONFIG_HVC_XEN) += hvc_xen.o -obj-$(CONFIG_HVC_IUCV) += hvc_iucv.o -obj-$(CONFIG_HVC_UDBG) += hvc_udbg.o -obj-$(CONFIG_VIRTIO_CONSOLE) += virtio_console.o obj-$(CONFIG_RAW_DRIVER) += raw.o obj-$(CONFIG_SGI_SNSC) += snsc.o snsc_event.o obj-$(CONFIG_MSPEC) += mspec.o obj-$(CONFIG_MMTIMER) += mmtimer.o obj-$(CONFIG_UV_MMTIMER) += uv_mmtimer.o obj-$(CONFIG_VIOTAPE) += viotape.o -obj-$(CONFIG_HVCS) += hvcs.o obj-$(CONFIG_IBM_BSR) += bsr.o obj-$(CONFIG_SGI_MBCS) += mbcs.o obj-$(CONFIG_BRIQ_PANEL) += briq_panel.o diff --git a/drivers/char/hvc_beat.c b/drivers/char/hvc_beat.c deleted file mode 100644 index 5fe4631e2a6..00000000000 --- a/drivers/char/hvc_beat.c +++ /dev/null @@ -1,134 +0,0 @@ -/* - * Beat hypervisor console driver - * - * (C) Copyright 2006 TOSHIBA CORPORATION - * - * This code is based on drivers/char/hvc_rtas.c: - * (C) Copyright IBM Corporation 2001-2005 - * (C) Copyright Red Hat, Inc. 2005 - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2 of the License, or - * (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License along - * with this program; if not, write to the Free Software Foundation, Inc., - * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. - */ - -#include <linux/module.h> -#include <linux/init.h> -#include <linux/err.h> -#include <linux/string.h> -#include <linux/console.h> -#include <asm/prom.h> -#include <asm/hvconsole.h> -#include <asm/firmware.h> - -#include "hvc_console.h" - -extern int64_t beat_get_term_char(uint64_t, uint64_t *, uint64_t *, uint64_t *); -extern int64_t beat_put_term_char(uint64_t, uint64_t, uint64_t, uint64_t); - -struct hvc_struct *hvc_beat_dev = NULL; - -/* bug: only one queue is available regardless of vtermno */ -static int hvc_beat_get_chars(uint32_t vtermno, char *buf, int cnt) -{ - static unsigned char q[sizeof(unsigned long) * 2] - __attribute__((aligned(sizeof(unsigned long)))); - static int qlen = 0; - u64 got; - -again: - if (qlen) { - if (qlen > cnt) { - memcpy(buf, q, cnt); - qlen -= cnt; - memmove(q + cnt, q, qlen); - return cnt; - } else { /* qlen <= cnt */ - int r; - - memcpy(buf, q, qlen); - r = qlen; - qlen = 0; - return r; - } - } - if (beat_get_term_char(vtermno, &got, - ((u64 *)q), ((u64 *)q) + 1) == 0) { - qlen = got; - goto again; - } - return 0; -} - -static int hvc_beat_put_chars(uint32_t vtermno, const char *buf, int cnt) -{ - unsigned long kb[2]; - int rest, nlen; - - for (rest = cnt; rest > 0; rest -= nlen) { - nlen = (rest > 16) ? 16 : rest; - memcpy(kb, buf, nlen); - beat_put_term_char(vtermno, nlen, kb[0], kb[1]); - buf += nlen; - } - return cnt; -} - -static const struct hv_ops hvc_beat_get_put_ops = { - .get_chars = hvc_beat_get_chars, - .put_chars = hvc_beat_put_chars, -}; - -static int hvc_beat_useit = 1; - -static int hvc_beat_config(char *p) -{ - hvc_beat_useit = simple_strtoul(p, NULL, 0); - return 0; -} - -static int __init hvc_beat_console_init(void) -{ - if (hvc_beat_useit && of_machine_is_compatible("Beat")) { - hvc_instantiate(0, 0, &hvc_beat_get_put_ops); - } - return 0; -} - -/* temp */ -static int __init hvc_beat_init(void) -{ - struct hvc_struct *hp; - - if (!firmware_has_feature(FW_FEATURE_BEAT)) - return -ENODEV; - - hp = hvc_alloc(0, NO_IRQ, &hvc_beat_get_put_ops, 16); - if (IS_ERR(hp)) - return PTR_ERR(hp); - hvc_beat_dev = hp; - return 0; -} - -static void __exit hvc_beat_exit(void) -{ - if (hvc_beat_dev) - hvc_remove(hvc_beat_dev); -} - -module_init(hvc_beat_init); -module_exit(hvc_beat_exit); - -__setup("hvc_beat=", hvc_beat_config); - -console_initcall(hvc_beat_console_init); diff --git a/drivers/char/hvc_console.c b/drivers/char/hvc_console.c deleted file mode 100644 index e9cba13ee80..00000000000 --- a/drivers/char/hvc_console.c +++ /dev/null @@ -1,914 +0,0 @@ -/* - * Copyright (C) 2001 Anton Blanchard <anton@au.ibm.com>, IBM - * Copyright (C) 2001 Paul Mackerras <paulus@au.ibm.com>, IBM - * Copyright (C) 2004 Benjamin Herrenschmidt <benh@kernel.crashing.org>, IBM Corp. - * Copyright (C) 2004 IBM Corporation - * - * Additional Author(s): - * Ryan S. Arnold <rsa@us.ibm.com> - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2 of the License, or - * (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA - */ - -#include <linux/console.h> -#include <linux/cpumask.h> -#include <linux/init.h> -#include <linux/kbd_kern.h> -#include <linux/kernel.h> -#include <linux/kthread.h> -#include <linux/list.h> -#include <linux/module.h> -#include <linux/major.h> -#include <linux/sysrq.h> -#include <linux/tty.h> -#include <linux/tty_flip.h> -#include <linux/sched.h> -#include <linux/spinlock.h> -#include <linux/delay.h> -#include <linux/freezer.h> -#include <linux/slab.h> - -#include <asm/uaccess.h> - -#include "hvc_console.h" - -#define HVC_MAJOR 229 -#define HVC_MINOR 0 - -/* - * Wait this long per iteration while trying to push buffered data to the - * hypervisor before allowing the tty to complete a close operation. - */ -#define HVC_CLOSE_WAIT (HZ/100) /* 1/10 of a second */ - -/* - * These sizes are most efficient for vio, because they are the - * native transfer size. We could make them selectable in the - * future to better deal with backends that want other buffer sizes. - */ -#define N_OUTBUF 16 -#define N_INBUF 16 - -#define __ALIGNED__ __attribute__((__aligned__(sizeof(long)))) - -static struct tty_driver *hvc_driver; -static struct task_struct *hvc_task; - -/* Picks up late kicks after list walk but before schedule() */ -static int hvc_kicked; - -static int hvc_init(void); - -#ifdef CONFIG_MAGIC_SYSRQ -static int sysrq_pressed; -#endif - -/* dynamic list of hvc_struct instances */ -static LIST_HEAD(hvc_structs); - -/* - * Protect the list of hvc_struct instances from inserts and removals during - * list traversal. - */ -static DEFINE_SPINLOCK(hvc_structs_lock); - -/* - * This value is used to assign a tty->index value to a hvc_struct based - * upon order of exposure via hvc_probe(), when we can not match it to - * a console candidate registered with hvc_instantiate(). - */ -static int last_hvc = -1; - -/* - * Do not call this function with either the hvc_structs_lock or the hvc_struct - * lock held. If successful, this function increments the kref reference - * count against the target hvc_struct so it should be released when finished. - */ -static struct hvc_struct *hvc_get_by_index(int index) -{ - struct hvc_struct *hp; - unsigned long flags; - - spin_lock(&hvc_structs_lock); - - list_for_each_entry(hp, &hvc_structs, next) { - spin_lock_irqsave(&hp->lock, flags); - if (hp->index == index) { - kref_get(&hp->kref); - spin_unlock_irqrestore(&hp->lock, flags); - spin_unlock(&hvc_structs_lock); - return hp; - } - spin_unlock_irqrestore(&hp->lock, flags); - } - hp = NULL; - - spin_unlock(&hvc_structs_lock); - return hp; -} - - -/* - * Initial console vtermnos for console API usage prior to full console - * initialization. Any vty adapter outside this range will not have usable - * console interfaces but can still be used as a tty device. This has to be - * static because kmalloc will not work during early console init. - */ -static const struct hv_ops *cons_ops[MAX_NR_HVC_CONSOLES]; -static uint32_t vtermnos[MAX_NR_HVC_CONSOLES] = - {[0 ... MAX_NR_HVC_CONSOLES - 1] = -1}; - -/* - * Console APIs, NOT TTY. These APIs are available immediately when - * hvc_console_setup() finds adapters. - */ - -static void hvc_console_print(struct console *co, const char *b, - unsigned count) -{ - char c[N_OUTBUF] __ALIGNED__; - unsigned i = 0, n = 0; - int r, donecr = 0, index = co->index; - - /* Console access attempt outside of acceptable console range. */ - if (index >= MAX_NR_HVC_CONSOLES) - return; - - /* This console adapter was removed so it is not usable. */ - if (vtermnos[index] == -1) - return; - - while (count > 0 || i > 0) { - if (count > 0 && i < sizeof(c)) { - if (b[n] == '\n' && !donecr) { - c[i++] = '\r'; - donecr = 1; - } else { - c[i++] = b[n++]; - donecr = 0; - --count; - } - } else { - r = cons_ops[index]->put_chars(vtermnos[index], c, i); - if (r <= 0) { - /* throw away chars on error */ - i = 0; - } else if (r > 0) { - i -= r; - if (i > 0) - memmove(c, c+r, i); - } - } - } -} - -static struct tty_driver *hvc_console_device(struct console *c, int *index) -{ - if (vtermnos[c->index] == -1) - return NULL; - - *index = c->index; - return hvc_driver; -} - -static int __init hvc_console_setup(struct console *co, char *options) -{ - if (co->index < 0 || co->index >= MAX_NR_HVC_CONSOLES) - return -ENODEV; - - if (vtermnos[co->index] == -1) - return -ENODEV; - - return 0; -} - -static struct console hvc_console = { - .name = "hvc", - .write = hvc_console_print, - .device = hvc_console_device, - .setup = hvc_console_setup, - .flags = CON_PRINTBUFFER, - .index = -1, -}; - -/* - * Early console initialization. Precedes driver initialization. - * - * (1) we are first, and the user specified another driver - * -- index will remain -1 - * (2) we are first and the user specified no driver - * -- index will be set to 0, then we will fail setup. - * (3) we are first and the user specified our driver - * -- index will be set to user specified driver, and we will fail - * (4) we are after driver, and this initcall will register us - * -- if the user didn't specify a driver then the console will match - * - * Note that for cases 2 and 3, we will match later when the io driver - * calls hvc_instantiate() and call register again. - */ -static int __init hvc_console_init(void) -{ - register_console(&hvc_console); - return 0; -} -console_initcall(hvc_console_init); - -/* callback when the kboject ref count reaches zero. */ -static void destroy_hvc_struct(struct kref *kref) -{ - struct hvc_struct *hp = container_of(kref, struct hvc_struct, kref); - unsigned long flags; - - spin_lock(&hvc_structs_lock); - - spin_lock_irqsave(&hp->lock, flags); - list_del(&(hp->next)); - spin_unlock_irqrestore(&hp->lock, flags); - - spin_unlock(&hvc_structs_lock); - - kfree(hp); -} - -/* - * hvc_instantiate() is an early console discovery method which locates - * consoles * prior to the vio subsystem discovering them. Hotplugged - * vty adapters do NOT get an hvc_instantiate() callback since they - * appear after early console init. - */ -int hvc_instantiate(uint32_t vtermno, int index, const struct hv_ops *ops) -{ - struct hvc_struct *hp; - - if (index < 0 || index >= MAX_NR_HVC_CONSOLES) - return -1; - - if (vtermnos[index] != -1) - return -1; - - /* make sure no no tty has been registered in this index */ - hp = hvc_get_by_index(index); - if (hp) { - kref_put(&hp->kref, destroy_hvc_struct); - return -1; - } - - vtermnos[index] = vtermno; - cons_ops[index] = ops; - - /* reserve all indices up to and including this index */ - if (last_hvc < index) - last_hvc = index; - - /* if this index is what the user requested, then register - * now (setup won't fail at this point). It's ok to just - * call register again if previously .setup failed. - */ - if (index == hvc_console.index) - register_console(&hvc_console); - - return 0; -} -EXPORT_SYMBOL_GPL(hvc_instantiate); - -/* Wake the sleeping khvcd */ -void hvc_kick(void) -{ - hvc_kicked = 1; - wake_up_process(hvc_task); -} -EXPORT_SYMBOL_GPL(hvc_kick); - -static void hvc_unthrottle(struct tty_struct *tty) -{ - hvc_kick(); -} - -/* - * The TTY interface won't be used until after the vio layer has exposed the vty - * adapter to the kernel. - */ -static int hvc_open(struct tty_struct *tty, struct file * filp) -{ - struct hvc_struct *hp; - unsigned long flags; - int rc = 0; - - /* Auto increments kref reference if found. */ - if (!(hp = hvc_get_by_index(tty->index))) - return -ENODEV; - - spin_lock_irqsave(&hp->lock, flags); - /* Check and then increment for fast path open. */ - if (hp->count++ > 0) { - tty_kref_get(tty); - spin_unlock_irqrestore(&hp->lock, flags); - hvc_kick(); - return 0; - } /* else count == 0 */ - - tty->driver_data = hp; - - hp->tty = tty_kref_get(tty); - - spin_unlock_irqrestore(&hp->lock, flags); - - if (hp->ops->notifier_add) - rc = hp->ops->notifier_add(hp, hp->data); - - /* - * If the notifier fails we return an error. The tty layer - * will call hvc_close() after a failed open but we don't want to clean - * up there so we'll clean up here and clear out the previously set - * tty fields and return the kref reference. - */ - if (rc) { - spin_lock_irqsave(&hp->lock, flags); - hp->tty = NULL; - spin_unlock_irqrestore(&hp->lock, flags); - tty_kref_put(tty); - tty->driver_data = NULL; - kref_put(&hp->kref, destroy_hvc_struct); - printk(KERN_ERR "hvc_open: request_irq failed with rc %d.\n", rc); - } - /* Force wakeup of the polling thread */ - hvc_kick(); - - return rc; -} - -static void hvc_close(struct tty_struct *tty, struct file * filp) -{ - struct hvc_struct *hp; - unsigned long flags; - - if (tty_hung_up_p(filp)) - return; - - /* - * No driver_data means that this close was issued after a failed - * hvc_open by the tty layer's release_dev() function and we can just - * exit cleanly because the kref reference wasn't made. - */ - if (!tty->driver_data) - return; - - hp = tty->driver_data; - - spin_lock_irqsave(&hp->lock, flags); - - if (--hp->count == 0) { - /* We are done with the tty pointer now. */ - hp->tty = NULL; - spin_unlock_irqrestore(&hp->lock, flags); - - if (hp->ops->notifier_del) - hp->ops->notifier_del(hp, hp->data); - - /* cancel pending tty resize work */ - cancel_work_sync(&hp->tty_resize); - - /* - * Chain calls chars_in_buffer() and returns immediately if - * there is no buffered data otherwise sleeps on a wait queue - * waking periodically to check chars_in_buffer(). - */ - tty_wait_until_sent(tty, HVC_CLOSE_WAIT); - } else { - if (hp->count < 0) - printk(KERN_ERR "hvc_close %X: oops, count is %d\n", - hp->vtermno, hp->count); - spin_unlock_irqrestore(&hp->lock, flags); - } - - tty_kref_put(tty); - kref_put(&hp->kref, destroy_hvc_struct); -} - -static void hvc_hangup(struct tty_struct *tty) -{ - struct hvc_struct *hp = tty->driver_data; - unsigned long flags; - int temp_open_count; - - if (!hp) - return; - - /* cancel pending tty resize work */ - cancel_work_sync(&hp->tty_resize); - - spin_lock_irqsave(&hp->lock, flags); - - /* - * The N_TTY line discipline has problems such that in a close vs - * open->hangup case this can be called after the final close so prevent - * that from happening for now. - */ - if (hp->count <= 0) { - spin_unlock_irqrestore(&hp->lock, flags); - return; - } - - temp_open_count = hp->count; - hp->count = 0; - hp->n_outbuf = 0; - hp->tty = NULL; - - spin_unlock_irqrestore(&hp->lock, flags); - - if (hp->ops->notifier_hangup) - hp->ops->notifier_hangup(hp, hp->data); - - while(temp_open_count) { - --temp_open_count; - tty_kref_put(tty); - kref_put(&hp->kref, destroy_hvc_struct); - } -} - -/* - * Push buffered characters whether they were just recently buffered or waiting - * on a blocked hypervisor. Call this function with hp->lock held. - */ -static int hvc_push(struct hvc_struct *hp) -{ - int n; - - n = hp->ops->put_chars(hp->vtermno, hp->outbuf, hp->n_outbuf); - if (n <= 0) { - if (n == 0) { - hp->do_wakeup = 1; - return 0; - } - /* throw away output on error; this happens when - there is no session connected to the vterm. */ - hp->n_outbuf = 0; - } else - hp->n_outbuf -= n; - if (hp->n_outbuf > 0) - memmove(hp->outbuf, hp->outbuf + n, hp->n_outbuf); - else - hp->do_wakeup = 1; - - return n; -} - -static int hvc_write(struct tty_struct *tty, const unsigned char *buf, int count) -{ - struct hvc_struct *hp = tty->driver_data; - unsigned long flags; - int rsize, written = 0; - - /* This write was probably executed during a tty close. */ - if (!hp) - return -EPIPE; - - if (hp->count <= 0) - return -EIO; - - spin_lock_irqsave(&hp->lock, flags); - - /* Push pending writes */ - if (hp->n_outbuf > 0) - hvc_push(hp); - - while (count > 0 && (rsize = hp->outbuf_size - hp->n_outbuf) > 0) { - if (rsize > count) - rsize = count; - memcpy(hp->outbuf + hp->n_outbuf, buf, rsize); - count -= rsize; - buf += rsize; - hp->n_outbuf += rsize; - written += rsize; - hvc_push(hp); - } - spin_unlock_irqrestore(&hp->lock, flags); - - /* - * Racy, but harmless, kick thread if there is still pending data. - */ - if (hp->n_outbuf) - hvc_kick(); - - return written; -} - -/** - * hvc_set_winsz() - Resize the hvc tty terminal window. - * @work: work structure. - * - * The routine shall not be called within an atomic context because it - * might sleep. - * - * Locking: hp->lock - */ -static void hvc_set_winsz(struct work_struct *work) -{ - struct hvc_struct *hp; - unsigned long hvc_flags; - struct tty_struct *tty; - struct winsize ws; - - hp = container_of(work, struct hvc_struct, tty_resize); - - spin_lock_irqsave(&hp->lock, hvc_flags); - if (!hp->tty) { - spin_unlock_irqrestore(&hp->lock, hvc_flags); - return; - } - ws = hp->ws; - tty = tty_kref_get(hp->tty); - spin_unlock_irqrestore(&hp->lock, hvc_flags); - - tty_do_resize(tty, &ws); - tty_kref_put(tty); -} - -/* - * This is actually a contract between the driver and the tty layer outlining - * how much write room the driver can guarantee will be sent OR BUFFERED. This - * driver MUST honor the return value. - */ -static int hvc_write_room(struct tty_struct *tty) -{ - struct hvc_struct *hp = tty->driver_data; - - if (!hp) - return -1; - - return hp->outbuf_size - hp->n_outbuf; -} - -static int hvc_chars_in_buffer(struct tty_struct *tty) -{ - struct hvc_struct *hp = tty->driver_data; - - if (!hp) - return 0; - return hp->n_outbuf; -} - -/* - * timeout will vary between the MIN and MAX values defined here. By default - * and during console activity we will use a default MIN_TIMEOUT of 10. When - * the console is idle, we increase the timeout value on each pass through - * msleep until we reach the max. This may be noticeable as a brief (average - * one second) delay on the console before the console responds to input when - * there has been no input for some time. - */ -#define MIN_TIMEOUT (10) -#define MAX_TIMEOUT (2000) -static u32 timeout = MIN_TIMEOUT; - -#define HVC_POLL_READ 0x00000001 -#define HVC_POLL_WRITE 0x00000002 - -int hvc_poll(struct hvc_struct *hp) -{ - struct tty_struct *tty; - int i, n, poll_mask = 0; - char buf[N_INBUF] __ALIGNED__; - unsigned long flags; - int read_total = 0; - int written_total = 0; - - spin_lock_irqsave(&hp->lock, flags); - - /* Push pending writes */ - if (hp->n_outbuf > 0) - written_total = hvc_push(hp); - - /* Reschedule us if still some write pending */ - if (hp->n_outbuf > 0) { - poll_mask |= HVC_POLL_WRITE; - /* If hvc_push() was not able to write, sleep a few msecs */ - timeout = (written_total) ? 0 : MIN_TIMEOUT; - } - - /* No tty attached, just skip */ - tty = tty_kref_get(hp->tty); - if (tty == NULL) - goto bail; - - /* Now check if we can get data (are we throttled ?) */ - if (test_bit(TTY_THROTTLED, &tty->flags)) - goto throttled; - - /* If we aren't notifier driven and aren't throttled, we always - * request a reschedule - */ - if (!hp->irq_requested) - poll_mask |= HVC_POLL_READ; - - /* Read data if any */ - for (;;) { - int count = tty_buffer_request_room(tty, N_INBUF); - - /* If flip is full, just reschedule a later read */ - if (count == 0) { - poll_mask |= HVC_POLL_READ; - break; - } - - n = hp->ops->get_chars(hp->vtermno, buf, count); - if (n <= 0) { - /* Hangup the tty when disconnected from host */ - if (n == -EPIPE) { - spin_unlock_irqrestore(&hp->lock, flags); - tty_hangup(tty); - spin_lock_irqsave(&hp->lock, flags); - } else if ( n == -EAGAIN ) { - /* - * Some back-ends can only ensure a certain min - * num of bytes read, which may be > 'count'. - * Let the tty clear the flip buff to make room. - */ - poll_mask |= HVC_POLL_READ; - } - break; - } - for (i = 0; i < n; ++i) { -#ifdef CONFIG_MAGIC_SYSRQ - if (hp->index == hvc_console.index) { - /* Handle the SysRq Hack */ - /* XXX should support a sequence */ - if (buf[i] == '\x0f') { /* ^O */ - /* if ^O is pressed again, reset - * sysrq_pressed and flip ^O char */ - sysrq_pressed = !sysrq_pressed; - if (sysrq_pressed) - continue; - } else if (sysrq_pressed) { - handle_sysrq(buf[i]); - sysrq_pressed = 0; - continue; - } - } -#endif /* CONFIG_MAGIC_SYSRQ */ - tty_insert_flip_char(tty, buf[i], 0); - } - - read_total += n; - } - throttled: - /* Wakeup write queue if necessary */ - if (hp->do_wakeup) { - hp->do_wakeup = 0; - tty_wakeup(tty); - } - bail: - spin_unlock_irqrestore(&hp->lock, flags); - - if (read_total) { - /* Activity is occurring, so reset the polling backoff value to - a minimum for performance. */ - timeout = MIN_TIMEOUT; - - tty_flip_buffer_push(tty); - } - if (tty) - tty_kref_put(tty); - - return poll_mask; -} -EXPORT_SYMBOL_GPL(hvc_poll); - -/** - * __hvc_resize() - Update terminal window size information. - * @hp: HVC console pointer - * @ws: Terminal window size structure - * - * Stores the specified window size information in the hvc structure of @hp. - * The function schedule the tty resize update. - * - * Locking: Locking free; the function MUST be called holding hp->lock - */ -void __hvc_resize(struct hvc_struct *hp, struct winsize ws) -{ - hp->ws = ws; - schedule_work(&hp->tty_resize); -} -EXPORT_SYMBOL_GPL(__hvc_resize); - -/* - * This kthread is either polling or interrupt driven. This is determined by - * calling hvc_poll() who determines whether a console adapter support - * interrupts. - */ -static int khvcd(void *unused) -{ - int poll_mask; - struct hvc_struct *hp; - - set_freezable(); - do { - poll_mask = 0; - hvc_kicked = 0; - try_to_freeze(); - wmb(); - if (!cpus_are_in_xmon()) { - spin_lock(&hvc_structs_lock); - list_for_each_entry(hp, &hvc_structs, next) { - poll_mask |= hvc_poll(hp); - } - spin_unlock(&hvc_structs_lock); - } else - poll_mask |= HVC_POLL_READ; - if (hvc_kicked) - continue; - set_current_state(TASK_INTERRUPTIBLE); - if (!hvc_kicked) { - if (poll_mask == 0) - schedule(); - else { - if (timeout < MAX_TIMEOUT) - timeout += (timeout >> 6) + 1; - - msleep_interruptible(timeout); - } - } - __set_current_state(TASK_RUNNING); - } while (!kthread_should_stop()); - - return 0; -} - -static const struct tty_operations hvc_ops = { - .open = hvc_open, - .close = hvc_close, - .write = hvc_write, - .hangup = hvc_hangup, - .unthrottle = hvc_unthrottle, - .write_room = hvc_write_room, - .chars_in_buffer = hvc_chars_in_buffer, -}; - -struct hvc_struct *hvc_alloc(uint32_t vtermno, int data, - const struct hv_ops *ops, - int outbuf_size) -{ - struct hvc_struct *hp; - int i; - - /* We wait until a driver actually comes along */ - if (!hvc_driver) { - int err = hvc_init(); - if (err) - return ERR_PTR(err); - } - - hp = kzalloc(ALIGN(sizeof(*hp), sizeof(long)) + outbuf_size, - GFP_KERNEL); - if (!hp) - return ERR_PTR(-ENOMEM); - - hp->vtermno = vtermno; - hp->data = data; - hp->ops = ops; - hp->outbuf_size = outbuf_size; - hp->outbuf = &((char *)hp)[ALIGN(sizeof(*hp), sizeof(long))]; - - kref_init(&hp->kref); - - INIT_WORK(&hp->tty_resize, hvc_set_winsz); - spin_lock_init(&hp->lock); - spin_lock(&hvc_structs_lock); - - /* - * find index to use: - * see if this vterm id matches one registered for console. - */ - for (i=0; i < MAX_NR_HVC_CONSOLES; i++) - if (vtermnos[i] == hp->vtermno && - cons_ops[i] == hp->ops) - break; - - /* no matching slot, just use a counter */ - if (i >= MAX_NR_HVC_CONSOLES) - i = ++last_hvc; - - hp->index = i; - - list_add_tail(&(hp->next), &hvc_structs); - spin_unlock(&hvc_structs_lock); - - return hp; -} -EXPORT_SYMBOL_GPL(hvc_alloc); - -int hvc_remove(struct hvc_struct *hp) -{ - unsigned long flags; - struct tty_struct *tty; - - spin_lock_irqsave(&hp->lock, flags); - tty = tty_kref_get(hp->tty); - - if (hp->index < MAX_NR_HVC_CONSOLES) - vtermnos[hp->index] = -1; - - /* Don't whack hp->irq because tty_hangup() will need to free the irq. */ - - spin_unlock_irqrestore(&hp->lock, flags); - - /* - * We 'put' the instance that was grabbed when the kref instance - * was initialized using kref_init(). Let the last holder of this - * kref cause it to be removed, which will probably be the tty_vhangup - * below. - */ - kref_put(&hp->kref, destroy_hvc_struct); - - /* - * This function call will auto chain call hvc_hangup. - */ - if (tty) { - tty_vhangup(tty); - tty_kref_put(tty); - } - return 0; -} -EXPORT_SYMBOL_GPL(hvc_remove); - -/* Driver initialization: called as soon as someone uses hvc_alloc(). */ -static int hvc_init(void) -{ - struct tty_driver *drv; - int err; - - /* We need more than hvc_count adapters due to hotplug additions. */ - drv = alloc_tty_driver(HVC_ALLOC_TTY_ADAPTERS); - if (!drv) { - err = -ENOMEM; - goto out; - } - - drv->owner = THIS_MODULE; - drv->driver_name = "hvc"; - drv->name = "hvc"; - drv->major = HVC_MAJOR; - drv->minor_start = HVC_MINOR; - drv->type = TTY_DRIVER_TYPE_SYSTEM; - drv->init_termios = tty_std_termios; - drv->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS; - tty_set_operations(drv, &hvc_ops); - - /* Always start the kthread because there can be hotplug vty adapters - * added later. */ - hvc_task = kthread_run(khvcd, NULL, "khvcd"); - if (IS_ERR(hvc_task)) { - printk(KERN_ERR "Couldn't create kthread for console.\n"); - err = PTR_ERR(hvc_task); - goto put_tty; - } - - err = tty_register_driver(drv); - if (err) { - printk(KERN_ERR "Couldn't register hvc console driver\n"); - goto stop_thread; - } - - /* - * Make sure tty is fully registered before allowing it to be - * found by hvc_console_device. - */ - smp_mb(); - hvc_driver = drv; - return 0; - -stop_thread: - kthread_stop(hvc_task); - hvc_task = NULL; -put_tty: - put_tty_driver(drv); -out: - return err; -} - -/* This isn't particularly necessary due to this being a console driver - * but it is nice to be thorough. - */ -static void __exit hvc_exit(void) -{ - if (hvc_driver) { - kthread_stop(hvc_task); - - tty_unregister_driver(hvc_driver); - /* return tty_struct instances allocated in hvc_init(). */ - put_tty_driver(hvc_driver); - unregister_console(&hvc_console); - } -} -module_exit(hvc_exit); diff --git a/drivers/char/hvc_console.h b/drivers/char/hvc_console.h deleted file mode 100644 index 54381eba4e4..00000000000 --- a/drivers/char/hvc_console.h +++ /dev/null @@ -1,119 +0,0 @@ -/* - * hvc_console.h - * Copyright (C) 2005 IBM Corporation - * - * Author(s): - * Ryan S. Arnold <rsa@us.ibm.com> - * - * hvc_console header information: - * moved here from arch/powerpc/include/asm/hvconsole.h - * and drivers/char/hvc_console.c - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2 of the License, or - * (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA - */ - -#ifndef HVC_CONSOLE_H -#define HVC_CONSOLE_H -#include <linux/kref.h> -#include <linux/tty.h> -#include <linux/spinlock.h> - -/* - * This is the max number of console adapters that can/will be found as - * console devices on first stage console init. Any number beyond this range - * can't be used as a console device but is still a valid tty device. - */ -#define MAX_NR_HVC_CONSOLES 16 - -/* - * The Linux TTY code does not support dynamic addition of tty derived devices - * so we need to know how many tty devices we might need when space is allocated - * for the tty device. Since this driver supports hotplug of vty adapters we - * need to make sure we have enough allocated. - */ -#define HVC_ALLOC_TTY_ADAPTERS 8 - -struct hvc_struct { - spinlock_t lock; - int index; - struct tty_struct *tty; - int count; - int do_wakeup; - char *outbuf; - int outbuf_size; - int n_outbuf; - uint32_t vtermno; - const struct hv_ops *ops; - int irq_requested; - int data; - struct winsize ws; - struct work_struct tty_resize; - struct list_head next; - struct kref kref; /* ref count & hvc_struct lifetime */ -}; - -/* implemented by a low level driver */ -struct hv_ops { - int (*get_chars)(uint32_t vtermno, char *buf, int count); - int (*put_chars)(uint32_t vtermno, const char *buf, int count); - - /* Callbacks for notification. Called in open, close and hangup */ - int (*notifier_add)(struct hvc_struct *hp, int irq); - void (*notifier_del)(struct hvc_struct *hp, int irq); - void (*notifier_hangup)(struct hvc_struct *hp, int irq); -}; - -/* Register a vterm and a slot index for use as a console (console_init) */ -extern int hvc_instantiate(uint32_t vtermno, int index, - const struct hv_ops *ops); - -/* register a vterm for hvc tty operation (module_init or hotplug add) */ -extern struct hvc_struct * hvc_alloc(uint32_t vtermno, int data, - const struct hv_ops *ops, int outbuf_size); -/* remove a vterm from hvc tty operation (module_exit or hotplug remove) */ -extern int hvc_remove(struct hvc_struct *hp); - -/* data available */ -int hvc_poll(struct hvc_struct *hp); -void hvc_kick(void); - -/* Resize hvc tty terminal window */ -extern void __hvc_resize(struct hvc_struct *hp, struct winsize ws); - -static inline void hvc_resize(struct hvc_struct *hp, struct winsize ws) -{ - unsigned long flags; - - spin_lock_irqsave(&hp->lock, flags); - __hvc_resize(hp, ws); - spin_unlock_irqrestore(&hp->lock, flags); -} - -/* default notifier for irq based notification */ -extern int notifier_add_irq(struct hvc_struct *hp, int data); -extern void notifier_del_irq(struct hvc_struct *hp, int data); -extern void notifier_hangup_irq(struct hvc_struct *hp, int data); - - -#if defined(CONFIG_XMON) && defined(CONFIG_SMP) -#include <asm/xmon.h> -#else -static inline int cpus_are_in_xmon(void) -{ - return 0; -} -#endif - -#endif // HVC_CONSOLE_H diff --git a/drivers/char/hvc_dcc.c b/drivers/char/hvc_dcc.c deleted file mode 100644 index 6470f63deb4..00000000000 --- a/drivers/char/hvc_dcc.c +++ /dev/null @@ -1,133 +0,0 @@ -/* Copyright (c) 2010, Code Aurora Forum. All rights reserved. - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 and - * only version 2 as published by the Free Software Foundation. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA - * 02110-1301, USA. - */ - -#include <linux/console.h> -#include <linux/delay.h> -#include <linux/err.h> -#include <linux/init.h> -#include <linux/moduleparam.h> -#include <linux/types.h> - -#include <asm/processor.h> - -#include "hvc_console.h" - -/* DCC Status Bits */ -#define DCC_STATUS_RX (1 << 30) -#define DCC_STATUS_TX (1 << 29) - -static inline u32 __dcc_getstatus(void) -{ - u32 __ret; - - asm("mrc p14, 0, %0, c0, c1, 0 @ read comms ctrl reg" - : "=r" (__ret) : : "cc"); - - return __ret; -} - - -#if defined(CONFIG_CPU_V7) -static inline char __dcc_getchar(void) -{ - char __c; - - asm("get_wait: mrc p14, 0, pc, c0, c1, 0 \n\ - bne get_wait \n\ - mrc p14, 0, %0, c0, c5, 0 @ read comms data reg" - : "=r" (__c) : : "cc"); - - return __c; -} -#else -static inline char __dcc_getchar(void) -{ - char __c; - - asm("mrc p14, 0, %0, c0, c5, 0 @ read comms data reg" - : "=r" (__c)); - - return __c; -} -#endif - -#if defined(CONFIG_CPU_V7) -static inline void __dcc_putchar(char c) -{ - asm("put_wait: mrc p14, 0, pc, c0, c1, 0 \n\ - bcs put_wait \n\ - mcr p14, 0, %0, c0, c5, 0 " - : : "r" (c) : "cc"); -} -#else -static inline void __dcc_putchar(char c) -{ - asm("mcr p14, 0, %0, c0, c5, 0 @ write a char" - : /* no output register */ - : "r" (c)); -} -#endif - -static int hvc_dcc_put_chars(uint32_t vt, const char *buf, int count) -{ - int i; - - for (i = 0; i < count; i++) { - while (__dcc_getstatus() & DCC_STATUS_TX) - cpu_relax(); - - __dcc_putchar((char)(buf[i] & 0xFF)); - } - - return count; -} - -static int hvc_dcc_get_chars(uint32_t vt, char *buf, int count) -{ - int i; - - for (i = 0; i < count; ++i) { - int c = -1; - - if (__dcc_getstatus() & DCC_STATUS_RX) - c = __dcc_getchar(); - if (c < 0) - break; - buf[i] = c; - } - - return i; -} - -static const struct hv_ops hvc_dcc_get_put_ops = { - .get_chars = hvc_dcc_get_chars, - .put_chars = hvc_dcc_put_chars, -}; - -static int __init hvc_dcc_console_init(void) -{ - hvc_instantiate(0, 0, &hvc_dcc_get_put_ops); - return 0; -} -console_initcall(hvc_dcc_console_init); - -static int __init hvc_dcc_init(void) -{ - hvc_alloc(0, 0, &hvc_dcc_get_put_ops, 128); - return 0; -} -device_initcall(hvc_dcc_init); diff --git a/drivers/char/hvc_irq.c b/drivers/char/hvc_irq.c deleted file mode 100644 index 2623e177e8d..00000000000 --- a/drivers/char/hvc_irq.c +++ /dev/null @@ -1,49 +0,0 @@ -/* - * Copyright IBM Corp. 2001,2008 - * - * This file contains the IRQ specific code for hvc_console - * - */ - -#include <linux/interrupt.h> - -#include "hvc_console.h" - -static irqreturn_t hvc_handle_interrupt(int irq, void *dev_instance) -{ - /* if hvc_poll request a repoll, then kick the hvcd thread */ - if (hvc_poll(dev_instance)) - hvc_kick(); - return IRQ_HANDLED; -} - -/* - * For IRQ based systems these callbacks can be used - */ -int notifier_add_irq(struct hvc_struct *hp, int irq) -{ - int rc; - - if (!irq) { - hp->irq_requested = 0; - return 0; - } - rc = request_irq(irq, hvc_handle_interrupt, IRQF_DISABLED, - "hvc_console", hp); - if (!rc) - hp->irq_requested = 1; - return rc; -} - -void notifier_del_irq(struct hvc_struct *hp, int irq) -{ - if (!hp->irq_requested) - return; - free_irq(irq, hp); - hp->irq_requested = 0; -} - -void notifier_hangup_irq(struct hvc_struct *hp, int irq) -{ - notifier_del_irq(hp, irq); -} diff --git a/drivers/char/hvc_iseries.c b/drivers/char/hvc_iseries.c deleted file mode 100644 index 21c54955084..00000000000 --- a/drivers/char/hvc_iseries.c +++ /dev/null @@ -1,598 +0,0 @@ -/* - * iSeries vio driver interface to hvc_console.c - * - * This code is based heavily on hvc_vio.c and viocons.c - * - * Copyright (C) 2006 Stephen Rothwell, IBM Corporation - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2 of the License, or - * (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA - */ -#include <stdarg.h> -#include <linux/types.h> -#include <linux/init.h> -#include <linux/kernel.h> -#include <linux/spinlock.h> -#include <linux/console.h> - -#include <asm/hvconsole.h> -#include <asm/vio.h> -#include <asm/prom.h> -#include <asm/firmware.h> -#include <asm/iseries/vio.h> -#include <asm/iseries/hv_call.h> -#include <asm/iseries/hv_lp_config.h> -#include <asm/iseries/hv_lp_event.h> - -#include "hvc_console.h" - -#define VTTY_PORTS 10 - -static DEFINE_SPINLOCK(consolelock); -static DEFINE_SPINLOCK(consoleloglock); - -static const char hvc_driver_name[] = "hvc_console"; - -#define IN_BUF_SIZE 200 - -/* - * Our port information. - */ -static struct port_info { - HvLpIndex lp; - u64 seq; /* sequence number of last HV send */ - u64 ack; /* last ack from HV */ - struct hvc_struct *hp; - int in_start; - int in_end; - unsigned char in_buf[IN_BUF_SIZE]; -} port_info[VTTY_PORTS] = { - [ 0 ... VTTY_PORTS - 1 ] = { - .lp = HvLpIndexInvalid - } -}; - -#define viochar_is_console(pi) ((pi) == &port_info[0]) - -static struct vio_device_id hvc_driver_table[] __devinitdata = { - {"serial", "IBM,iSeries-vty"}, - { "", "" } -}; -MODULE_DEVICE_TABLE(vio, hvc_driver_table); - -static void hvlog(char *fmt, ...) -{ - int i; - unsigned long flags; - va_list args; - static char buf[256]; - - spin_lock_irqsave(&consoleloglock, flags); - va_start(args, fmt); - i = vscnprintf(buf, sizeof(buf) - 1, fmt, args); - va_end(args); - buf[i++] = '\r'; - HvCall_writeLogBuffer(buf, i); - spin_unlock_irqrestore(&consoleloglock, flags); -} - -/* - * Initialize the common fields in a charLpEvent - */ -static void init_data_event(struct viocharlpevent *viochar, HvLpIndex lp) -{ - struct HvLpEvent *hev = &viochar->event; - - memset(viochar, 0, sizeof(struct viocharlpevent)); - - hev->flags = HV_LP_EVENT_VALID | HV_LP_EVENT_DEFERRED_ACK | - HV_LP_EVENT_INT; - hev->xType = HvLpEvent_Type_VirtualIo; - hev->xSubtype = viomajorsubtype_chario | viochardata; - hev->xSourceLp = HvLpConfig_getLpIndex(); - hev->xTargetLp = lp; - hev->xSizeMinus1 = sizeof(struct viocharlpevent); - hev->xSourceInstanceId = viopath_sourceinst(lp); - hev->xTargetInstanceId = viopath_targetinst(lp); -} - -static int get_chars(uint32_t vtermno, char *buf, int count) -{ - struct port_info *pi; - int n = 0; - unsigned long flags; - - if (vtermno >= VTTY_PORTS) - return -EINVAL; - if (count == 0) - return 0; - - pi = &port_info[vtermno]; - spin_lock_irqsave(&consolelock, flags); - - if (pi->in_end == 0) - goto done; - - n = pi->in_end - pi->in_start; - if (n > count) - n = count; - memcpy(buf, &pi->in_buf[pi->in_start], n); - pi->in_start += n; - if (pi->in_start == pi->in_end) { - pi->in_start = 0; - pi->in_end = 0; - } -done: - spin_unlock_irqrestore(&consolelock, flags); - return n; -} - -static int put_chars(uint32_t vtermno, const char *buf, int count) -{ - struct viocharlpevent *viochar; - struct port_info *pi; - HvLpEvent_Rc hvrc; - unsigned long flags; - int sent = 0; - - if (vtermno >= VTTY_PORTS) - return -EINVAL; - - pi = &port_info[vtermno]; - - spin_lock_irqsave(&consolelock, flags); - - if (viochar_is_console(pi) && !viopath_isactive(pi->lp)) { - HvCall_writeLogBuffer(buf, count); - sent = count; - goto done; - } - - viochar = vio_get_event_buffer(viomajorsubtype_chario); - if (viochar == NULL) { - hvlog("\n\rviocons: Can't get viochar buffer."); - goto done; - } - - while ((count > 0) && ((pi->seq - pi->ack) < VIOCHAR_WINDOW)) { - int len; - - len = (count > VIOCHAR_MAX_DATA) ? VIOCHAR_MAX_DATA : count; - - if (viochar_is_console(pi)) - HvCall_writeLogBuffer(buf, len); - - init_data_event(viochar, pi->lp); - - viochar->len = len; - viochar->event.xCorrelationToken = pi->seq++; - viochar->event.xSizeMinus1 = - offsetof(struct viocharlpevent, data) + len; - - memcpy(viochar->data, buf, len); - - hvrc = HvCallEvent_signalLpEvent(&viochar->event); - if (hvrc) - hvlog("\n\rerror sending event! return code %d\n\r", - (int)hvrc); - sent += len; - count -= len; - buf += len; - } - - vio_free_event_buffer(viomajorsubtype_chario, viochar); -done: - spin_unlock_irqrestore(&consolelock, flags); - return sent; -} - -static const struct hv_ops hvc_get_put_ops = { - .get_chars = get_chars, - .put_chars = put_chars, - .notifier_add = notifier_add_irq, - .notifier_del = notifier_del_irq, - .notifier_hangup = notifier_hangup_irq, -}; - -static int __devinit hvc_vio_probe(struct vio_dev *vdev, - const struct vio_device_id *id) -{ - struct hvc_struct *hp; - struct port_info *pi; - - /* probed with invalid parameters. */ - if (!vdev || !id) - return -EPERM; - - if (vdev->unit_address >= VTTY_PORTS) - return -ENODEV; - - pi = &port_info[vdev->unit_address]; - - hp = hvc_alloc(vdev->unit_address, vdev->irq, &hvc_get_put_ops, - VIOCHAR_MAX_DATA); - if (IS_ERR(hp)) - return PTR_ERR(hp); - pi->hp = hp; - dev_set_drvdata(&vdev->dev, pi); - - return 0; -} - -static int __devexit hvc_vio_remove(struct vio_dev *vdev) -{ - struct port_info *pi = dev_get_drvdata(&vdev->dev); - struct hvc_struct *hp = pi->hp; - - return hvc_remove(hp); -} - -static struct vio_driver hvc_vio_driver = { - .id_table = hvc_driver_table, - .probe = hvc_vio_probe, - .remove = __devexit_p(hvc_vio_remove), - .driver = { - .name = hvc_driver_name, - .owner = THIS_MODULE, - } -}; - -static void hvc_open_event(struct HvLpEvent *event) -{ - unsigned long flags; - struct viocharlpevent *cevent = (struct viocharlpevent *)event; - u8 port = cevent->virtual_device; - struct port_info *pi; - int reject = 0; - - if (hvlpevent_is_ack(event)) { - if (port >= VTTY_PORTS) - return; - - spin_lock_irqsave(&consolelock, flags); - - pi = &port_info[port]; - if (event->xRc == HvLpEvent_Rc_Good) { - pi->seq = pi->ack = 0; - /* - * This line allows connections from the primary - * partition but once one is connected from the - * primary partition nothing short of a reboot - * of linux will allow access from the hosting - * partition again without a required iSeries fix. - */ - pi->lp = event->xTargetLp; - } - - spin_unlock_irqrestore(&consolelock, flags); - if (event->xRc != HvLpEvent_Rc_Good) - printk(KERN_WARNING - "hvc: handle_open_event: event->xRc == (%d).\n", - event->xRc); - - if (event->xCorrelationToken != 0) { - atomic_t *aptr= (atomic_t *)event->xCorrelationToken; - atomic_set(aptr, 1); - } else - printk(KERN_WARNING - "hvc: weird...got open ack without atomic\n"); - return; - } - - /* This had better require an ack, otherwise complain */ - if (!hvlpevent_need_ack(event)) { - printk(KERN_WARNING "hvc: viocharopen without ack bit!\n"); - return; - } - - spin_lock_irqsave(&consolelock, flags); - - /* Make sure this is a good virtual tty */ - if (port >= VTTY_PORTS) { - event->xRc = HvLpEvent_Rc_SubtypeError; - cevent->subtype_result_code = viorc_openRejected; - /* - * Flag state here since we can't printk while holding - * the consolelock spinlock. - */ - reject = 1; - } else { - pi = &port_info[port]; - if ((pi->lp != HvLpIndexInvalid) && - (pi->lp != event->xSourceLp)) { - /* - * If this is tty is already connected to a different - * partition, fail. - */ - event->xRc = HvLpEvent_Rc_SubtypeError; - cevent->subtype_result_code = viorc_openRejected; - reject = 2; - } else { - pi->lp = event->xSourceLp; - event->xRc = HvLpEvent_Rc_Good; - cevent->subtype_result_code = viorc_good; - pi->seq = pi->ack = 0; - } - } - - spin_unlock_irqrestore(&consolelock, flags); - - if (reject == 1) - printk(KERN_WARNING "hvc: open rejected: bad virtual tty.\n"); - else if (reject == 2) - printk(KERN_WARNING "hvc: open rejected: console in exclusive " - "use by another partition.\n"); - - /* Return the acknowledgement */ - HvCallEvent_ackLpEvent(event); -} - -/* - * Handle a close charLpEvent. This should ONLY be an Interrupt because the - * virtual console should never actually issue a close event to the hypervisor - * because the virtual console never goes away. A close event coming from the - * hypervisor simply means that there are no client consoles connected to the - * virtual console. - */ -static void hvc_close_event(struct HvLpEvent *event) -{ - unsigned long flags; - struct viocharlpevent *cevent = (struct viocharlpevent *)event; - u8 port = cevent->virtual_device; - - if (!hvlpevent_is_int(event)) { - printk(KERN_WARNING - "hvc: got unexpected close acknowledgement\n"); - return; - } - - if (port >= VTTY_PORTS) { - printk(KERN_WARNING - "hvc: close message from invalid virtual device.\n"); - return; - } - - /* For closes, just mark the console partition invalid */ - spin_lock_irqsave(&consolelock, flags); - - if (port_info[port].lp == event->xSourceLp) - port_info[port].lp = HvLpIndexInvalid; - - spin_unlock_irqrestore(&consolelock, flags); -} - -static void hvc_data_event(struct HvLpEvent *event) -{ - unsigned long flags; - struct viocharlpevent *cevent = (struct viocharlpevent *)event; - struct port_info *pi; - int n; - u8 port = cevent->virtual_device; - - if (port >= VTTY_PORTS) { - printk(KERN_WARNING "hvc: data on invalid virtual device %d\n", - port); - return; - } - if (cevent->len == 0) - return; - - /* - * Change 05/01/2003 - Ryan Arnold: If a partition other than - * the current exclusive partition tries to send us data - * events then just drop them on the floor because we don't - * want his stinking data. He isn't authorized to receive - * data because he wasn't the first one to get the console, - * therefore he shouldn't be allowed to send data either. - * This will work without an iSeries fix. - */ - pi = &port_info[port]; - if (pi->lp != event->xSourceLp) - return; - - spin_lock_irqsave(&consolelock, flags); - - n = IN_BUF_SIZE - pi->in_end; - if (n > cevent->len) - n = cevent->len; - if (n > 0) { - memcpy(&pi->in_buf[pi->in_end], cevent->data, n); - pi->in_end += n; - } - spin_unlock_irqrestore(&consolelock, flags); - if (n == 0) - printk(KERN_WARNING "hvc: input buffer overflow\n"); -} - -static void hvc_ack_event(struct HvLpEvent *event) -{ - struct viocharlpevent *cevent = (struct viocharlpevent *)event; - unsigned long flags; - u8 port = cevent->virtual_device; - - if (port >= VTTY_PORTS) { - printk(KERN_WARNING "hvc: data on invalid virtual device\n"); - return; - } - - spin_lock_irqsave(&consolelock, flags); - port_info[port].ack = event->xCorrelationToken; - spin_unlock_irqrestore(&consolelock, flags); -} - -static void hvc_config_event(struct HvLpEvent *event) -{ - struct viocharlpevent *cevent = (struct viocharlpevent *)event; - - if (cevent->data[0] == 0x01) - printk(KERN_INFO "hvc: window resized to %d: %d: %d: %d\n", - cevent->data[1], cevent->data[2], - cevent->data[3], cevent->data[4]); - else - printk(KERN_WARNING "hvc: unknown config event\n"); -} - -static void hvc_handle_event(struct HvLpEvent *event) -{ - int charminor; - - if (event == NULL) - return; - - charminor = event->xSubtype & VIOMINOR_SUBTYPE_MASK; - switch (charminor) { - case viocharopen: - hvc_open_event(event); - break; - case viocharclose: - hvc_close_event(event); - break; - case viochardata: - hvc_data_event(event); - break; - case viocharack: - hvc_ack_event(event); - break; - case viocharconfig: - hvc_config_event(event); - break; - default: - if (hvlpevent_is_int(event) && hvlpevent_need_ack(event)) { - event->xRc = HvLpEvent_Rc_InvalidSubtype; - HvCallEvent_ackLpEvent(event); - } - } -} - -static int __init send_open(HvLpIndex remoteLp, void *sem) -{ - return HvCallEvent_signalLpEventFast(remoteLp, - HvLpEvent_Type_VirtualIo, - viomajorsubtype_chario | viocharopen, - HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck, - viopath_sourceinst(remoteLp), - viopath_targetinst(remoteLp), - (u64)(unsigned long)sem, VIOVERSION << 16, - 0, 0, 0, 0); -} - -static int __init hvc_vio_init(void) -{ - atomic_t wait_flag; - int rc; - - if (!firmware_has_feature(FW_FEATURE_ISERIES)) - return -EIO; - - /* +2 for fudge */ - rc = viopath_open(HvLpConfig_getPrimaryLpIndex(), - viomajorsubtype_chario, VIOCHAR_WINDOW + 2); - if (rc) - printk(KERN_WARNING "hvc: error opening to primary %d\n", rc); - - if (viopath_hostLp == HvLpIndexInvalid) - vio_set_hostlp(); - - /* - * And if the primary is not the same as the hosting LP, open to the - * hosting lp - */ - if ((viopath_hostLp != HvLpIndexInvalid) && - (viopath_hostLp != HvLpConfig_getPrimaryLpIndex())) { - printk(KERN_INFO "hvc: open path to hosting (%d)\n", - viopath_hostLp); - rc = viopath_open(viopath_hostLp, viomajorsubtype_chario, - VIOCHAR_WINDOW + 2); /* +2 for fudge */ - if (rc) - printk(KERN_WARNING - "error opening to partition %d: %d\n", - viopath_hostLp, rc); - } - - if (vio_setHandler(viomajorsubtype_chario, hvc_handle_event) < 0) - printk(KERN_WARNING - "hvc: error seting handler for console events!\n"); - - /* - * First, try to open the console to the hosting lp. - * Wait on a semaphore for the response. - */ - atomic_set(&wait_flag, 0); - if ((viopath_isactive(viopath_hostLp)) && - (send_open(viopath_hostLp, &wait_flag) == 0)) { - printk(KERN_INFO "hvc: hosting partition %d\n", viopath_hostLp); - while (atomic_read(&wait_flag) == 0) - mb(); - atomic_set(&wait_flag, 0); - } - - /* - * If we don't have an active console, try the primary - */ - if ((!viopath_isactive(port_info[0].lp)) && - (viopath_isactive(HvLpConfig_getPrimaryLpIndex())) && - (send_open(HvLpConfig_getPrimaryLpIndex(), &wait_flag) == 0)) { - printk(KERN_INFO "hvc: opening console to primary partition\n"); - while (atomic_read(&wait_flag) == 0) - mb(); - } - - /* Register as a vio device to receive callbacks */ - rc = vio_register_driver(&hvc_vio_driver); - - return rc; -} -module_init(hvc_vio_init); /* after drivers/char/hvc_console.c */ - -static void __exit hvc_vio_exit(void) -{ - vio_unregister_driver(&hvc_vio_driver); -} -module_exit(hvc_vio_exit); - -/* the device tree order defines our numbering */ -static int __init hvc_find_vtys(void) -{ - struct device_node *vty; - int num_found = 0; - - for (vty = of_find_node_by_name(NULL, "vty"); vty != NULL; - vty = of_find_node_by_name(vty, "vty")) { - const uint32_t *vtermno; - - /* We have statically defined space for only a certain number - * of console adapters. - */ - if ((num_found >= MAX_NR_HVC_CONSOLES) || - (num_found >= VTTY_PORTS)) { - of_node_put(vty); - break; - } - - vtermno = of_get_property(vty, "reg", NULL); - if (!vtermno) - continue; - - if (!of_device_is_compatible(vty, "IBM,iSeries-vty")) - continue; - - if (num_found == 0) - add_preferred_console("hvc", 0, NULL); - hvc_instantiate(*vtermno, num_found, &hvc_get_put_ops); - ++num_found; - } - - return num_found; -} -console_initcall(hvc_find_vtys); diff --git a/drivers/char/hvc_iucv.c b/drivers/char/hvc_iucv.c deleted file mode 100644 index c3425bb3a1f..00000000000 --- a/drivers/char/hvc_iucv.c +++ /dev/null @@ -1,1337 +0,0 @@ -/* - * hvc_iucv.c - z/VM IUCV hypervisor console (HVC) device driver - * - * This HVC device driver provides terminal access using - * z/VM IUCV communication paths. - * - * Copyright IBM Corp. 2008, 2009 - * - * Author(s): Hendrik Brueckner <brueckner@linux.vnet.ibm.com> - */ -#define KMSG_COMPONENT "hvc_iucv" -#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt - -#include <linux/types.h> -#include <linux/slab.h> -#include <asm/ebcdic.h> -#include <linux/ctype.h> -#include <linux/delay.h> -#include <linux/device.h> -#include <linux/init.h> -#include <linux/mempool.h> -#include <linux/moduleparam.h> -#include <linux/tty.h> -#include <linux/wait.h> -#include <net/iucv/iucv.h> - -#include "hvc_console.h" - - -/* General device driver settings */ -#define HVC_IUCV_MAGIC 0xc9e4c3e5 -#define MAX_HVC_IUCV_LINES HVC_ALLOC_TTY_ADAPTERS -#define MEMPOOL_MIN_NR (PAGE_SIZE / sizeof(struct iucv_tty_buffer)/4) - -/* IUCV TTY message */ -#define MSG_VERSION 0x02 /* Message version */ -#define MSG_TYPE_ERROR 0x01 /* Error message */ -#define MSG_TYPE_TERMENV 0x02 /* Terminal environment variable */ -#define MSG_TYPE_TERMIOS 0x04 /* Terminal IO struct update */ -#define MSG_TYPE_WINSIZE 0x08 /* Terminal window size update */ -#define MSG_TYPE_DATA 0x10 /* Terminal data */ - -struct iucv_tty_msg { - u8 version; /* Message version */ - u8 type; /* Message type */ -#define MSG_MAX_DATALEN ((u16)(~0)) - u16 datalen; /* Payload length */ - u8 data[]; /* Payload buffer */ -} __attribute__((packed)); -#define MSG_SIZE(s) ((s) + offsetof(struct iucv_tty_msg, data)) - -enum iucv_state_t { - IUCV_DISCONN = 0, - IUCV_CONNECTED = 1, - IUCV_SEVERED = 2, -}; - -enum tty_state_t { - TTY_CLOSED = 0, - TTY_OPENED = 1, -}; - -struct hvc_iucv_private { - struct hvc_struct *hvc; /* HVC struct reference */ - u8 srv_name[8]; /* IUCV service name (ebcdic) */ - unsigned char is_console; /* Linux console usage flag */ - enum iucv_state_t iucv_state; /* IUCV connection status */ - enum tty_state_t tty_state; /* TTY status */ - struct iucv_path *path; /* IUCV path pointer */ - spinlock_t lock; /* hvc_iucv_private lock */ -#define SNDBUF_SIZE (PAGE_SIZE) /* must be < MSG_MAX_DATALEN */ - void *sndbuf; /* send buffer */ - size_t sndbuf_len; /* length of send buffer */ -#define QUEUE_SNDBUF_DELAY (HZ / 25) - struct delayed_work sndbuf_work; /* work: send iucv msg(s) */ - wait_queue_head_t sndbuf_waitq; /* wait for send completion */ - struct list_head tty_outqueue; /* outgoing IUCV messages */ - struct list_head tty_inqueue; /* incoming IUCV messages */ - struct device *dev; /* device structure */ -}; - -struct iucv_tty_buffer { - struct list_head list; /* list pointer */ - struct iucv_message msg; /* store an IUCV message */ - size_t offset; /* data buffer offset */ - struct iucv_tty_msg *mbuf; /* buffer to store input/output data */ -}; - -/* IUCV callback handler */ -static int hvc_iucv_path_pending(struct iucv_path *, u8[8], u8[16]); -static void hvc_iucv_path_severed(struct iucv_path *, u8[16]); -static void hvc_iucv_msg_pending(struct iucv_path *, struct iucv_message *); -static void hvc_iucv_msg_complete(struct iucv_path *, struct iucv_message *); - - -/* Kernel module parameter: use one terminal device as default */ -static unsigned long hvc_iucv_devices = 1; - -/* Array of allocated hvc iucv tty lines... */ -static struct hvc_iucv_private *hvc_iucv_table[MAX_HVC_IUCV_LINES]; -#define IUCV_HVC_CON_IDX (0) -/* List of z/VM user ID filter entries (struct iucv_vmid_filter) */ -#define MAX_VMID_FILTER (500) -static size_t hvc_iucv_filter_size; -static void *hvc_iucv_filter; -static const char *hvc_iucv_filter_string; -static DEFINE_RWLOCK(hvc_iucv_filter_lock); - -/* Kmem cache and mempool for iucv_tty_buffer elements */ -static struct kmem_cache *hvc_iucv_buffer_cache; -static mempool_t *hvc_iucv_mempool; - -/* IUCV handler callback functions */ -static struct iucv_handler hvc_iucv_handler = { - .path_pending = hvc_iucv_path_pending, - .path_severed = hvc_iucv_path_severed, - .message_complete = hvc_iucv_msg_complete, - .message_pending = hvc_iucv_msg_pending, -}; - - -/** - * hvc_iucv_get_private() - Return a struct hvc_iucv_private instance. - * @num: The HVC virtual terminal number (vtermno) - * - * This function returns the struct hvc_iucv_private instance that corresponds - * to the HVC virtual terminal number specified as parameter @num. - */ -struct hvc_iucv_private *hvc_iucv_get_private(uint32_t num) -{ - if ((num < HVC_IUCV_MAGIC) || (num - HVC_IUCV_MAGIC > hvc_iucv_devices)) - return NULL; - return hvc_iucv_table[num - HVC_IUCV_MAGIC]; -} - -/** - * alloc_tty_buffer() - Return a new struct iucv_tty_buffer element. - * @size: Size of the internal buffer used to store data. - * @flags: Memory allocation flags passed to mempool. - * - * This function allocates a new struct iucv_tty_buffer element and, optionally, - * allocates an internal data buffer with the specified size @size. - * The internal data buffer is always allocated with GFP_DMA which is - * required for receiving and sending data with IUCV. - * Note: The total message size arises from the internal buffer size and the - * members of the iucv_tty_msg structure. - * The function returns NULL if memory allocation has failed. - */ -static struct iucv_tty_buffer *alloc_tty_buffer(size_t size, gfp_t flags) -{ - struct iucv_tty_buffer *bufp; - - bufp = mempool_alloc(hvc_iucv_mempool, flags); - if (!bufp) - return NULL; - memset(bufp, 0, sizeof(*bufp)); - - if (size > 0) { - bufp->msg.length = MSG_SIZE(size); - bufp->mbuf = kmalloc(bufp->msg.length, flags | GFP_DMA); - if (!bufp->mbuf) { - mempool_free(bufp, hvc_iucv_mempool); - return NULL; - } - bufp->mbuf->version = MSG_VERSION; - bufp->mbuf->type = MSG_TYPE_DATA; - bufp->mbuf->datalen = (u16) size; - } - return bufp; -} - -/** - * destroy_tty_buffer() - destroy struct iucv_tty_buffer element. - * @bufp: Pointer to a struct iucv_tty_buffer element, SHALL NOT be NULL. - */ -static void destroy_tty_buffer(struct iucv_tty_buffer *bufp) -{ - kfree(bufp->mbuf); - mempool_free(bufp, hvc_iucv_mempool); -} - -/** - * destroy_tty_buffer_list() - call destroy_tty_buffer() for each list element. - * @list: List containing struct iucv_tty_buffer elements. - */ -static void destroy_tty_buffer_list(struct list_head *list) -{ - struct iucv_tty_buffer *ent, *next; - - list_for_each_entry_safe(ent, next, list, list) { - list_del(&ent->list); - destroy_tty_buffer(ent); - } -} - -/** - * hvc_iucv_write() - Receive IUCV message & write data to HVC buffer. - * @priv: Pointer to struct hvc_iucv_private - * @buf: HVC buffer for writing received terminal data. - * @count: HVC buffer size. - * @has_more_data: Pointer to an int variable. - * - * The function picks up pending messages from the input queue and receives - * the message data that is then written to the specified buffer @buf. - * If the buffer size @count is less than the data message size, the - * message is kept on the input queue and @has_more_data is set to 1. - * If all message data has been written, the message is removed from - * the input queue. - * - * The function returns the number of bytes written to the terminal, zero if - * there are no pending data messages available or if there is no established - * IUCV path. - * If the IUCV path has been severed, then -EPIPE is returned to cause a - * hang up (that is issued by the HVC layer). - */ -static int hvc_iucv_write(struct hvc_iucv_private *priv, - char *buf, int count, int *has_more_data) -{ - struct iucv_tty_buffer *rb; - int written; - int rc; - - /* immediately return if there is no IUCV connection */ - if (priv->iucv_state == IUCV_DISCONN) - return 0; - - /* if the IUCV path has been severed, return -EPIPE to inform the - * HVC layer to hang up the tty device. */ - if (priv->iucv_state == IUCV_SEVERED) - return -EPIPE; - - /* check if there are pending messages */ - if (list_empty(&priv->tty_inqueue)) - return 0; - - /* receive an iucv message and flip data to the tty (ldisc) */ - rb = list_first_entry(&priv->tty_inqueue, struct iucv_tty_buffer, list); - - written = 0; - if (!rb->mbuf) { /* message not yet received ... */ - /* allocate mem to store msg data; if no memory is available - * then leave the buffer on the list and re-try later */ - rb->mbuf = kmalloc(rb->msg.length, GFP_ATOMIC | GFP_DMA); - if (!rb->mbuf) - return -ENOMEM; - - rc = __iucv_message_receive(priv->path, &rb->msg, 0, - rb->mbuf, rb->msg.length, NULL); - switch (rc) { - case 0: /* Successful */ - break; - case 2: /* No message found */ - case 9: /* Message purged */ - break; - default: - written = -EIO; - } - /* remove buffer if an error has occured or received data - * is not correct */ - if (rc || (rb->mbuf->version != MSG_VERSION) || - (rb->msg.length != MSG_SIZE(rb->mbuf->datalen))) - goto out_remove_buffer; - } - - switch (rb->mbuf->type) { - case MSG_TYPE_DATA: - written = min_t(int, rb->mbuf->datalen - rb->offset, count); - memcpy(buf, rb->mbuf->data + rb->offset, written); - if (written < (rb->mbuf->datalen - rb->offset)) { - rb->offset += written; - *has_more_data = 1; - goto out_written; - } - break; - - case MSG_TYPE_WINSIZE: - if (rb->mbuf->datalen != sizeof(struct winsize)) - break; - /* The caller must ensure that the hvc is locked, which - * is the case when called from hvc_iucv_get_chars() */ - __hvc_resize(priv->hvc, *((struct winsize *) rb->mbuf->data)); - break; - - case MSG_TYPE_ERROR: /* ignored ... */ - case MSG_TYPE_TERMENV: /* ignored ... */ - case MSG_TYPE_TERMIOS: /* ignored ... */ - break; - } - -out_remove_buffer: - list_del(&rb->list); - destroy_tty_buffer(rb); - *has_more_data = !list_empty(&priv->tty_inqueue); - -out_written: - return written; -} - -/** - * hvc_iucv_get_chars() - HVC get_chars operation. - * @vtermno: HVC virtual terminal number. - * @buf: Pointer to a buffer to store data - * @count: Size of buffer available for writing - * - * The HVC thread calls this method to read characters from the back-end. - * If an IUCV communication path has been established, pending IUCV messages - * are received and data is copied into buffer @buf up to @count bytes. - * - * Locking: The routine gets called under an irqsave() spinlock; and - * the routine locks the struct hvc_iucv_private->lock to call - * helper functions. - */ -static int hvc_iucv_get_chars(uint32_t vtermno, char *buf, int count) -{ - struct hvc_iucv_private *priv = hvc_iucv_get_private(vtermno); - int written; - int has_more_data; - - if (count <= 0) - return 0; - - if (!priv) - return -ENODEV; - - spin_lock(&priv->lock); - has_more_data = 0; - written = hvc_iucv_write(priv, buf, count, &has_more_data); - spin_unlock(&priv->lock); - - /* if there are still messages on the queue... schedule another run */ - if (has_more_data) - hvc_kick(); - - return written; -} - -/** - * hvc_iucv_queue() - Buffer terminal data for sending. - * @priv: Pointer to struct hvc_iucv_private instance. - * @buf: Buffer containing data to send. - * @count: Size of buffer and amount of data to send. - * - * The function queues data for sending. To actually send the buffered data, - * a work queue function is scheduled (with QUEUE_SNDBUF_DELAY). - * The function returns the number of data bytes that has been buffered. - * - * If the device is not connected, data is ignored and the function returns - * @count. - * If the buffer is full, the function returns 0. - * If an existing IUCV communicaton path has been severed, -EPIPE is returned - * (that can be passed to HVC layer to cause a tty hangup). - */ -static int hvc_iucv_queue(struct hvc_iucv_private *priv, const char *buf, - int count) -{ - size_t len; - - if (priv->iucv_state == IUCV_DISCONN) - return count; /* ignore data */ - - if (priv->iucv_state == IUCV_SEVERED) - return -EPIPE; - - len = min_t(size_t, count, SNDBUF_SIZE - priv->sndbuf_len); - if (!len) - return 0; - - memcpy(priv->sndbuf + priv->sndbuf_len, buf, len); - priv->sndbuf_len += len; - - if (priv->iucv_state == IUCV_CONNECTED) - schedule_delayed_work(&priv->sndbuf_work, QUEUE_SNDBUF_DELAY); - - return len; -} - -/** - * hvc_iucv_send() - Send an IUCV message containing terminal data. - * @priv: Pointer to struct hvc_iucv_private instance. - * - * If an IUCV communication path has been established, the buffered output data - * is sent via an IUCV message and the number of bytes sent is returned. - * Returns 0 if there is no established IUCV communication path or - * -EPIPE if an existing IUCV communicaton path has been severed. - */ -static int hvc_iucv_send(struct hvc_iucv_private *priv) -{ - struct iucv_tty_buffer *sb; - int rc, len; - - if (priv->iucv_state == IUCV_SEVERED) - return -EPIPE; - - if (priv->iucv_state == IUCV_DISCONN) - return -EIO; - - if (!priv->sndbuf_len) - return 0; - - /* allocate internal buffer to store msg data and also compute total - * message length */ - sb = alloc_tty_buffer(priv->sndbuf_len, GFP_ATOMIC); - if (!sb) - return -ENOMEM; - - memcpy(sb->mbuf->data, priv->sndbuf, priv->sndbuf_len); - sb->mbuf->datalen = (u16) priv->sndbuf_len; - sb->msg.length = MSG_SIZE(sb->mbuf->datalen); - - list_add_tail(&sb->list, &priv->tty_outqueue); - - rc = __iucv_message_send(priv->path, &sb->msg, 0, 0, - (void *) sb->mbuf, sb->msg.length); - if (rc) { - /* drop the message here; however we might want to handle - * 0x03 (msg limit reached) by trying again... */ - list_del(&sb->list); - destroy_tty_buffer(sb); - } - len = priv->sndbuf_len; - priv->sndbuf_len = 0; - - return len; -} - -/** - * hvc_iucv_sndbuf_work() - Send buffered data over IUCV - * @work: Work structure. - * - * This work queue function sends buffered output data over IUCV and, - * if not all buffered data could be sent, reschedules itself. - */ -static void hvc_iucv_sndbuf_work(struct work_struct *work) -{ - struct hvc_iucv_private *priv; - - priv = container_of(work, struct hvc_iucv_private, sndbuf_work.work); - if (!priv) - return; - - spin_lock_bh(&priv->lock); - hvc_iucv_send(priv); - spin_unlock_bh(&priv->lock); -} - -/** - * hvc_iucv_put_chars() - HVC put_chars operation. - * @vtermno: HVC virtual terminal number. - * @buf: Pointer to an buffer to read data from - * @count: Size of buffer available for reading - * - * The HVC thread calls this method to write characters to the back-end. - * The function calls hvc_iucv_queue() to queue terminal data for sending. - * - * Locking: The method gets called under an irqsave() spinlock; and - * locks struct hvc_iucv_private->lock. - */ -static int hvc_iucv_put_chars(uint32_t vtermno, const char *buf, int count) -{ - struct hvc_iucv_private *priv = hvc_iucv_get_private(vtermno); - int queued; - - if (count <= 0) - return 0; - - if (!priv) - return -ENODEV; - - spin_lock(&priv->lock); - queued = hvc_iucv_queue(priv, buf, count); - spin_unlock(&priv->lock); - - return queued; -} - -/** - * hvc_iucv_notifier_add() - HVC notifier for opening a TTY for the first time. - * @hp: Pointer to the HVC device (struct hvc_struct) - * @id: Additional data (originally passed to hvc_alloc): the index of an struct - * hvc_iucv_private instance. - * - * The function sets the tty state to TTY_OPENED for the struct hvc_iucv_private - * instance that is derived from @id. Always returns 0. - * - * Locking: struct hvc_iucv_private->lock, spin_lock_bh - */ -static int hvc_iucv_notifier_add(struct hvc_struct *hp, int id) -{ - struct hvc_iucv_private *priv; - - priv = hvc_iucv_get_private(id); - if (!priv) - return 0; - - spin_lock_bh(&priv->lock); - priv->tty_state = TTY_OPENED; - spin_unlock_bh(&priv->lock); - - return 0; -} - -/** - * hvc_iucv_cleanup() - Clean up and reset a z/VM IUCV HVC instance. - * @priv: Pointer to the struct hvc_iucv_private instance. - */ -static void hvc_iucv_cleanup(struct hvc_iucv_private *priv) -{ - destroy_tty_buffer_list(&priv->tty_outqueue); - destroy_tty_buffer_list(&priv->tty_inqueue); - - priv->tty_state = TTY_CLOSED; - priv->iucv_state = IUCV_DISCONN; - - priv->sndbuf_len = 0; -} - -/** - * tty_outqueue_empty() - Test if the tty outq is empty - * @priv: Pointer to struct hvc_iucv_private instance. - */ -static inline int tty_outqueue_empty(struct hvc_iucv_private *priv) -{ - int rc; - - spin_lock_bh(&priv->lock); - rc = list_empty(&priv->tty_outqueue); - spin_unlock_bh(&priv->lock); - - return rc; -} - -/** - * flush_sndbuf_sync() - Flush send buffer and wait for completion - * @priv: Pointer to struct hvc_iucv_private instance. - * - * The routine cancels a pending sndbuf work, calls hvc_iucv_send() - * to flush any buffered terminal output data and waits for completion. - */ -static void flush_sndbuf_sync(struct hvc_iucv_private *priv) -{ - int sync_wait; - - cancel_delayed_work_sync(&priv->sndbuf_work); - - spin_lock_bh(&priv->lock); - hvc_iucv_send(priv); /* force sending buffered data */ - sync_wait = !list_empty(&priv->tty_outqueue); /* anything queued ? */ - spin_unlock_bh(&priv->lock); - - if (sync_wait) - wait_event_timeout(priv->sndbuf_waitq, - tty_outqueue_empty(priv), HZ/10); -} - -/** - * hvc_iucv_hangup() - Sever IUCV path and schedule hvc tty hang up - * @priv: Pointer to hvc_iucv_private structure - * - * This routine severs an existing IUCV communication path and hangs - * up the underlying HVC terminal device. - * The hang-up occurs only if an IUCV communication path is established; - * otherwise there is no need to hang up the terminal device. - * - * The IUCV HVC hang-up is separated into two steps: - * 1. After the IUCV path has been severed, the iucv_state is set to - * IUCV_SEVERED. - * 2. Later, when the HVC thread calls hvc_iucv_get_chars(), the - * IUCV_SEVERED state causes the tty hang-up in the HVC layer. - * - * If the tty has not yet been opened, clean up the hvc_iucv_private - * structure to allow re-connects. - * If the tty has been opened, let get_chars() return -EPIPE to signal - * the HVC layer to hang up the tty and, if so, wake up the HVC thread - * to call get_chars()... - * - * Special notes on hanging up a HVC terminal instantiated as console: - * Hang-up: 1. do_tty_hangup() replaces file ops (= hung_up_tty_fops) - * 2. do_tty_hangup() calls tty->ops->close() for console_filp - * => no hangup notifier is called by HVC (default) - * 2. hvc_close() returns because of tty_hung_up_p(filp) - * => no delete notifier is called! - * Finally, the back-end is not being notified, thus, the tty session is - * kept active (TTY_OPEN) to be ready for re-connects. - * - * Locking: spin_lock(&priv->lock) w/o disabling bh - */ -static void hvc_iucv_hangup(struct hvc_iucv_private *priv) -{ - struct iucv_path *path; - - path = NULL; - spin_lock(&priv->lock); - if (priv->iucv_state == IUCV_CONNECTED) { - path = priv->path; - priv->path = NULL; - priv->iucv_state = IUCV_SEVERED; - if (priv->tty_state == TTY_CLOSED) - hvc_iucv_cleanup(priv); - else - /* console is special (see above) */ - if (priv->is_console) { - hvc_iucv_cleanup(priv); - priv->tty_state = TTY_OPENED; - } else - hvc_kick(); - } - spin_unlock(&priv->lock); - - /* finally sever path (outside of priv->lock due to lock ordering) */ - if (path) { - iucv_path_sever(path, NULL); - iucv_path_free(path); - } -} - -/** - * hvc_iucv_notifier_hangup() - HVC notifier for TTY hangups. - * @hp: Pointer to the HVC device (struct hvc_struct) - * @id: Additional data (originally passed to hvc_alloc): - * the index of an struct hvc_iucv_private instance. - * - * This routine notifies the HVC back-end that a tty hangup (carrier loss, - * virtual or otherwise) has occured. - * The z/VM IUCV HVC device driver ignores virtual hangups (vhangup()) - * to keep an existing IUCV communication path established. - * (Background: vhangup() is called from user space (by getty or login) to - * disable writing to the tty by other applications). - * If the tty has been opened and an established IUCV path has been severed - * (we caused the tty hangup), the function calls hvc_iucv_cleanup(). - * - * Locking: struct hvc_iucv_private->lock - */ -static void hvc_iucv_notifier_hangup(struct hvc_struct *hp, int id) -{ - struct hvc_iucv_private *priv; - - priv = hvc_iucv_get_private(id); - if (!priv) - return; - - flush_sndbuf_sync(priv); - - spin_lock_bh(&priv->lock); - /* NOTE: If the hangup was scheduled by ourself (from the iucv - * path_servered callback [IUCV_SEVERED]), we have to clean up - * our structure and to set state to TTY_CLOSED. - * If the tty was hung up otherwise (e.g. vhangup()), then we - * ignore this hangup and keep an established IUCV path open... - * (...the reason is that we are not able to connect back to the - * client if we disconnect on hang up) */ - priv->tty_state = TTY_CLOSED; - - if (priv->iucv_state == IUCV_SEVERED) - hvc_iucv_cleanup(priv); - spin_unlock_bh(&priv->lock); -} - -/** - * hvc_iucv_notifier_del() - HVC notifier for closing a TTY for the last time. - * @hp: Pointer to the HVC device (struct hvc_struct) - * @id: Additional data (originally passed to hvc_alloc): - * the index of an struct hvc_iucv_private instance. - * - * This routine notifies the HVC back-end that the last tty device fd has been - * closed. The function calls hvc_iucv_cleanup() to clean up the struct - * hvc_iucv_private instance. - * - * Locking: struct hvc_iucv_private->lock - */ -static void hvc_iucv_notifier_del(struct hvc_struct *hp, int id) -{ - struct hvc_iucv_private *priv; - struct iucv_path *path; - - priv = hvc_iucv_get_private(id); - if (!priv) - return; - - flush_sndbuf_sync(priv); - - spin_lock_bh(&priv->lock); - path = priv->path; /* save reference to IUCV path */ - priv->path = NULL; - hvc_iucv_cleanup(priv); - spin_unlock_bh(&priv->lock); - - /* sever IUCV path outside of priv->lock due to lock ordering of: - * priv->lock <--> iucv_table_lock */ - if (path) { - iucv_path_sever(path, NULL); - iucv_path_free(path); - } -} - -/** - * hvc_iucv_filter_connreq() - Filter connection request based on z/VM user ID - * @ipvmid: Originating z/VM user ID (right padded with blanks) - * - * Returns 0 if the z/VM user ID @ipvmid is allowed to connection, otherwise - * non-zero. - */ -static int hvc_iucv_filter_connreq(u8 ipvmid[8]) -{ - size_t i; - - /* Note: default policy is ACCEPT if no filter is set */ - if (!hvc_iucv_filter_size) - return 0; - - for (i = 0; i < hvc_iucv_filter_size; i++) - if (0 == memcmp(ipvmid, hvc_iucv_filter + (8 * i), 8)) - return 0; - return 1; -} - -/** - * hvc_iucv_path_pending() - IUCV handler to process a connection request. - * @path: Pending path (struct iucv_path) - * @ipvmid: z/VM system identifier of originator - * @ipuser: User specified data for this path - * (AF_IUCV: port/service name and originator port) - * - * The function uses the @ipuser data to determine if the pending path belongs - * to a terminal managed by this device driver. - * If the path belongs to this driver, ensure that the terminal is not accessed - * multiple times (only one connection to a terminal is allowed). - * If the terminal is not yet connected, the pending path is accepted and is - * associated to the appropriate struct hvc_iucv_private instance. - * - * Returns 0 if @path belongs to a terminal managed by the this device driver; - * otherwise returns -ENODEV in order to dispatch this path to other handlers. - * - * Locking: struct hvc_iucv_private->lock - */ -static int hvc_iucv_path_pending(struct iucv_path *path, - u8 ipvmid[8], u8 ipuser[16]) -{ - struct hvc_iucv_private *priv; - u8 nuser_data[16]; - u8 vm_user_id[9]; - int i, rc; - - priv = NULL; - for (i = 0; i < hvc_iucv_devices; i++) - if (hvc_iucv_table[i] && - (0 == memcmp(hvc_iucv_table[i]->srv_name, ipuser, 8))) { - priv = hvc_iucv_table[i]; - break; - } - if (!priv) - return -ENODEV; - - /* Enforce that ipvmid is allowed to connect to us */ - read_lock(&hvc_iucv_filter_lock); - rc = hvc_iucv_filter_connreq(ipvmid); - read_unlock(&hvc_iucv_filter_lock); - if (rc) { - iucv_path_sever(path, ipuser); - iucv_path_free(path); - memcpy(vm_user_id, ipvmid, 8); - vm_user_id[8] = 0; - pr_info("A connection request from z/VM user ID %s " - "was refused\n", vm_user_id); - return 0; - } - - spin_lock(&priv->lock); - - /* If the terminal is already connected or being severed, then sever - * this path to enforce that there is only ONE established communication - * path per terminal. */ - if (priv->iucv_state != IUCV_DISCONN) { - iucv_path_sever(path, ipuser); - iucv_path_free(path); - goto out_path_handled; - } - - /* accept path */ - memcpy(nuser_data, ipuser + 8, 8); /* remote service (for af_iucv) */ - memcpy(nuser_data + 8, ipuser, 8); /* local service (for af_iucv) */ - path->msglim = 0xffff; /* IUCV MSGLIMIT */ - path->flags &= ~IUCV_IPRMDATA; /* TODO: use IUCV_IPRMDATA */ - rc = iucv_path_accept(path, &hvc_iucv_handler, nuser_data, priv); - if (rc) { - iucv_path_sever(path, ipuser); - iucv_path_free(path); - goto out_path_handled; - } - priv->path = path; - priv->iucv_state = IUCV_CONNECTED; - - /* flush buffered output data... */ - schedule_delayed_work(&priv->sndbuf_work, 5); - -out_path_handled: - spin_unlock(&priv->lock); - return 0; -} - -/** - * hvc_iucv_path_severed() - IUCV handler to process a path sever. - * @path: Pending path (struct iucv_path) - * @ipuser: User specified data for this path - * (AF_IUCV: port/service name and originator port) - * - * This function calls the hvc_iucv_hangup() function for the - * respective IUCV HVC terminal. - * - * Locking: struct hvc_iucv_private->lock - */ -static void hvc_iucv_path_severed(struct iucv_path *path, u8 ipuser[16]) -{ - struct hvc_iucv_private *priv = path->private; - - hvc_iucv_hangup(priv); -} - -/** - * hvc_iucv_msg_pending() - IUCV handler to process an incoming IUCV message. - * @path: Pending path (struct iucv_path) - * @msg: Pointer to the IUCV message - * - * The function puts an incoming message on the input queue for later - * processing (by hvc_iucv_get_chars() / hvc_iucv_write()). - * If the tty has not yet been opened, the message is rejected. - * - * Locking: struct hvc_iucv_private->lock - */ -static void hvc_iucv_msg_pending(struct iucv_path *path, - struct iucv_message *msg) -{ - struct hvc_iucv_private *priv = path->private; - struct iucv_tty_buffer *rb; - - /* reject messages that exceed max size of iucv_tty_msg->datalen */ - if (msg->length > MSG_SIZE(MSG_MAX_DATALEN)) { - iucv_message_reject(path, msg); - return; - } - - spin_lock(&priv->lock); - - /* reject messages if tty has not yet been opened */ - if (priv->tty_state == TTY_CLOSED) { - iucv_message_reject(path, msg); - goto unlock_return; - } - - /* allocate tty buffer to save iucv msg only */ - rb = alloc_tty_buffer(0, GFP_ATOMIC); - if (!rb) { - iucv_message_reject(path, msg); - goto unlock_return; /* -ENOMEM */ - } - rb->msg = *msg; - - list_add_tail(&rb->list, &priv->tty_inqueue); - - hvc_kick(); /* wake up hvc thread */ - -unlock_return: - spin_unlock(&priv->lock); -} - -/** - * hvc_iucv_msg_complete() - IUCV handler to process message completion - * @path: Pending path (struct iucv_path) - * @msg: Pointer to the IUCV message - * - * The function is called upon completion of message delivery to remove the - * message from the outqueue. Additional delivery information can be found - * msg->audit: rejected messages (0x040000 (IPADRJCT)), and - * purged messages (0x010000 (IPADPGNR)). - * - * Locking: struct hvc_iucv_private->lock - */ -static void hvc_iucv_msg_complete(struct iucv_path *path, - struct iucv_message *msg) -{ - struct hvc_iucv_private *priv = path->private; - struct iucv_tty_buffer *ent, *next; - LIST_HEAD(list_remove); - - spin_lock(&priv->lock); - list_for_each_entry_safe(ent, next, &priv->tty_outqueue, list) - if (ent->msg.id == msg->id) { - list_move(&ent->list, &list_remove); - break; - } - wake_up(&priv->sndbuf_waitq); - spin_unlock(&priv->lock); - destroy_tty_buffer_list(&list_remove); -} - -/** - * hvc_iucv_pm_freeze() - Freeze PM callback - * @dev: IUVC HVC terminal device - * - * Sever an established IUCV communication path and - * trigger a hang-up of the underlying HVC terminal. - */ -static int hvc_iucv_pm_freeze(struct device *dev) -{ - struct hvc_iucv_private *priv = dev_get_drvdata(dev); - - local_bh_disable(); - hvc_iucv_hangup(priv); - local_bh_enable(); - - return 0; -} - -/** - * hvc_iucv_pm_restore_thaw() - Thaw and restore PM callback - * @dev: IUVC HVC terminal device - * - * Wake up the HVC thread to trigger hang-up and respective - * HVC back-end notifier invocations. - */ -static int hvc_iucv_pm_restore_thaw(struct device *dev) -{ - hvc_kick(); - return 0; -} - - -/* HVC operations */ -static const struct hv_ops hvc_iucv_ops = { - .get_chars = hvc_iucv_get_chars, - .put_chars = hvc_iucv_put_chars, - .notifier_add = hvc_iucv_notifier_add, - .notifier_del = hvc_iucv_notifier_del, - .notifier_hangup = hvc_iucv_notifier_hangup, -}; - -/* Suspend / resume device operations */ -static const struct dev_pm_ops hvc_iucv_pm_ops = { - .freeze = hvc_iucv_pm_freeze, - .thaw = hvc_iucv_pm_restore_thaw, - .restore = hvc_iucv_pm_restore_thaw, -}; - -/* IUCV HVC device driver */ -static struct device_driver hvc_iucv_driver = { - .name = KMSG_COMPONENT, - .bus = &iucv_bus, - .pm = &hvc_iucv_pm_ops, -}; - -/** - * hvc_iucv_alloc() - Allocates a new struct hvc_iucv_private instance - * @id: hvc_iucv_table index - * @is_console: Flag if the instance is used as Linux console - * - * This function allocates a new hvc_iucv_private structure and stores - * the instance in hvc_iucv_table at index @id. - * Returns 0 on success; otherwise non-zero. - */ -static int __init hvc_iucv_alloc(int id, unsigned int is_console) -{ - struct hvc_iucv_private *priv; - char name[9]; - int rc; - - priv = kzalloc(sizeof(struct hvc_iucv_private), GFP_KERNEL); - if (!priv) - return -ENOMEM; - - spin_lock_init(&priv->lock); - INIT_LIST_HEAD(&priv->tty_outqueue); - INIT_LIST_HEAD(&priv->tty_inqueue); - INIT_DELAYED_WORK(&priv->sndbuf_work, hvc_iucv_sndbuf_work); - init_waitqueue_head(&priv->sndbuf_waitq); - - priv->sndbuf = (void *) get_zeroed_page(GFP_KERNEL); - if (!priv->sndbuf) { - kfree(priv); - return -ENOMEM; - } - - /* set console flag */ - priv->is_console = is_console; - - /* allocate hvc device */ - priv->hvc = hvc_alloc(HVC_IUCV_MAGIC + id, /* PAGE_SIZE */ - HVC_IUCV_MAGIC + id, &hvc_iucv_ops, 256); - if (IS_ERR(priv->hvc)) { - rc = PTR_ERR(priv->hvc); - goto out_error_hvc; - } - - /* notify HVC thread instead of using polling */ - priv->hvc->irq_requested = 1; - - /* setup iucv related information */ - snprintf(name, 9, "lnxhvc%-2d", id); - memcpy(priv->srv_name, name, 8); - ASCEBC(priv->srv_name, 8); - - /* create and setup device */ - priv->dev = kzalloc(sizeof(*priv->dev), GFP_KERNEL); - if (!priv->dev) { - rc = -ENOMEM; - goto out_error_dev; - } - dev_set_name(priv->dev, "hvc_iucv%d", id); - dev_set_drvdata(priv->dev, priv); - priv->dev->bus = &iucv_bus; - priv->dev->parent = iucv_root; - priv->dev->driver = &hvc_iucv_driver; - priv->dev->release = (void (*)(struct device *)) kfree; - rc = device_register(priv->dev); - if (rc) { - put_device(priv->dev); - goto out_error_dev; - } - - hvc_iucv_table[id] = priv; - return 0; - -out_error_dev: - hvc_remove(priv->hvc); -out_error_hvc: - free_page((unsigned long) priv->sndbuf); - kfree(priv); - - return rc; -} - -/** - * hvc_iucv_destroy() - Destroy and free hvc_iucv_private instances - */ -static void __init hvc_iucv_destroy(struct hvc_iucv_private *priv) -{ - hvc_remove(priv->hvc); - device_unregister(priv->dev); - free_page((unsigned long) priv->sndbuf); - kfree(priv); -} - -/** - * hvc_iucv_parse_filter() - Parse filter for a single z/VM user ID - * @filter: String containing a comma-separated list of z/VM user IDs - */ -static const char *hvc_iucv_parse_filter(const char *filter, char *dest) -{ - const char *nextdelim, *residual; - size_t len; - - nextdelim = strchr(filter, ','); - if (nextdelim) { - len = nextdelim - filter; - residual = nextdelim + 1; - } else { - len = strlen(filter); - residual = filter + len; - } - - if (len == 0) - return ERR_PTR(-EINVAL); - - /* check for '\n' (if called from sysfs) */ - if (filter[len - 1] == '\n') - len--; - - if (len > 8) - return ERR_PTR(-EINVAL); - - /* pad with blanks and save upper case version of user ID */ - memset(dest, ' ', 8); - while (len--) - dest[len] = toupper(filter[len]); - return residual; -} - -/** - * hvc_iucv_setup_filter() - Set up z/VM user ID filter - * @filter: String consisting of a comma-separated list of z/VM user IDs - * - * The function parses the @filter string and creates an array containing - * the list of z/VM user ID filter entries. - * Return code 0 means success, -EINVAL if the filter is syntactically - * incorrect, -ENOMEM if there was not enough memory to allocate the - * filter list array, or -ENOSPC if too many z/VM user IDs have been specified. - */ -static int hvc_iucv_setup_filter(const char *val) -{ - const char *residual; - int err; - size_t size, count; - void *array, *old_filter; - - count = strlen(val); - if (count == 0 || (count == 1 && val[0] == '\n')) { - size = 0; - array = NULL; - goto out_replace_filter; /* clear filter */ - } - - /* count user IDs in order to allocate sufficient memory */ - size = 1; - residual = val; - while ((residual = strchr(residual, ',')) != NULL) { - residual++; - size++; - } - - /* check if the specified list exceeds the filter limit */ - if (size > MAX_VMID_FILTER) - return -ENOSPC; - - array = kzalloc(size * 8, GFP_KERNEL); - if (!array) - return -ENOMEM; - - count = size; - residual = val; - while (*residual && count) { - residual = hvc_iucv_parse_filter(residual, - array + ((size - count) * 8)); - if (IS_ERR(residual)) { - err = PTR_ERR(residual); - kfree(array); - goto out_err; - } - count--; - } - -out_replace_filter: - write_lock_bh(&hvc_iucv_filter_lock); - old_filter = hvc_iucv_filter; - hvc_iucv_filter_size = size; - hvc_iucv_filter = array; - write_unlock_bh(&hvc_iucv_filter_lock); - kfree(old_filter); - - err = 0; -out_err: - return err; -} - -/** - * param_set_vmidfilter() - Set z/VM user ID filter parameter - * @val: String consisting of a comma-separated list of z/VM user IDs - * @kp: Kernel parameter pointing to hvc_iucv_filter array - * - * The function sets up the z/VM user ID filter specified as comma-separated - * list of user IDs in @val. - * Note: If it is called early in the boot process, @val is stored and - * parsed later in hvc_iucv_init(). - */ -static int param_set_vmidfilter(const char *val, const struct kernel_param *kp) -{ - int rc; - - if (!MACHINE_IS_VM || !hvc_iucv_devices) - return -ENODEV; - - if (!val) - return -EINVAL; - - rc = 0; - if (slab_is_available()) - rc = hvc_iucv_setup_filter(val); - else - hvc_iucv_filter_string = val; /* defer... */ - return rc; -} - -/** - * param_get_vmidfilter() - Get z/VM user ID filter - * @buffer: Buffer to store z/VM user ID filter, - * (buffer size assumption PAGE_SIZE) - * @kp: Kernel parameter pointing to the hvc_iucv_filter array - * - * The function stores the filter as a comma-separated list of z/VM user IDs - * in @buffer. Typically, sysfs routines call this function for attr show. - */ -static int param_get_vmidfilter(char *buffer, const struct kernel_param *kp) -{ - int rc; - size_t index, len; - void *start, *end; - - if (!MACHINE_IS_VM || !hvc_iucv_devices) - return -ENODEV; - - rc = 0; - read_lock_bh(&hvc_iucv_filter_lock); - for (index = 0; index < hvc_iucv_filter_size; index++) { - start = hvc_iucv_filter + (8 * index); - end = memchr(start, ' ', 8); - len = (end) ? end - start : 8; - memcpy(buffer + rc, start, len); - rc += len; - buffer[rc++] = ','; - } - read_unlock_bh(&hvc_iucv_filter_lock); - if (rc) - buffer[--rc] = '\0'; /* replace last comma and update rc */ - return rc; -} - -#define param_check_vmidfilter(name, p) __param_check(name, p, void) - -static struct kernel_param_ops param_ops_vmidfilter = { - .set = param_set_vmidfilter, - .get = param_get_vmidfilter, -}; - -/** - * hvc_iucv_init() - z/VM IUCV HVC device driver initialization - */ -static int __init hvc_iucv_init(void) -{ - int rc; - unsigned int i; - - if (!hvc_iucv_devices) - return -ENODEV; - - if (!MACHINE_IS_VM) { - pr_notice("The z/VM IUCV HVC device driver cannot " - "be used without z/VM\n"); - rc = -ENODEV; - goto out_error; - } - - if (hvc_iucv_devices > MAX_HVC_IUCV_LINES) { - pr_err("%lu is not a valid value for the hvc_iucv= " - "kernel parameter\n", hvc_iucv_devices); - rc = -EINVAL; - goto out_error; - } - - /* register IUCV HVC device driver */ - rc = driver_register(&hvc_iucv_driver); - if (rc) - goto out_error; - - /* parse hvc_iucv_allow string and create z/VM user ID filter list */ - if (hvc_iucv_filter_string) { - rc = hvc_iucv_setup_filter(hvc_iucv_filter_string); - switch (rc) { - case 0: - break; - case -ENOMEM: - pr_err("Allocating memory failed with " - "reason code=%d\n", 3); - goto out_error; - case -EINVAL: - pr_err("hvc_iucv_allow= does not specify a valid " - "z/VM user ID list\n"); - goto out_error; - case -ENOSPC: - pr_err("hvc_iucv_allow= specifies too many " - "z/VM user IDs\n"); - goto out_error; - default: - goto out_error; - } - } - - hvc_iucv_buffer_cache = kmem_cache_create(KMSG_COMPONENT, - sizeof(struct iucv_tty_buffer), - 0, 0, NULL); - if (!hvc_iucv_buffer_cache) { - pr_err("Allocating memory failed with reason code=%d\n", 1); - rc = -ENOMEM; - goto out_error; - } - - hvc_iucv_mempool = mempool_create_slab_pool(MEMPOOL_MIN_NR, - hvc_iucv_buffer_cache); - if (!hvc_iucv_mempool) { - pr_err("Allocating memory failed with reason code=%d\n", 2); - kmem_cache_destroy(hvc_iucv_buffer_cache); - rc = -ENOMEM; - goto out_error; - } - - /* register the first terminal device as console - * (must be done before allocating hvc terminal devices) */ - rc = hvc_instantiate(HVC_IUCV_MAGIC, IUCV_HVC_CON_IDX, &hvc_iucv_ops); - if (rc) { - pr_err("Registering HVC terminal device as " - "Linux console failed\n"); - goto out_error_memory; - } - - /* allocate hvc_iucv_private structs */ - for (i = 0; i < hvc_iucv_devices; i++) { - rc = hvc_iucv_alloc(i, (i == IUCV_HVC_CON_IDX) ? 1 : 0); - if (rc) { - pr_err("Creating a new HVC terminal device " - "failed with error code=%d\n", rc); - goto out_error_hvc; - } - } - - /* register IUCV callback handler */ - rc = iucv_register(&hvc_iucv_handler, 0); - if (rc) { - pr_err("Registering IUCV handlers failed with error code=%d\n", - rc); - goto out_error_hvc; - } - - return 0; - -out_error_hvc: - for (i = 0; i < hvc_iucv_devices; i++) - if (hvc_iucv_table[i]) - hvc_iucv_destroy(hvc_iucv_table[i]); -out_error_memory: - mempool_destroy(hvc_iucv_mempool); - kmem_cache_destroy(hvc_iucv_buffer_cache); -out_error: - if (hvc_iucv_filter) - kfree(hvc_iucv_filter); - hvc_iucv_devices = 0; /* ensure that we do not provide any device */ - return rc; -} - -/** - * hvc_iucv_config() - Parsing of hvc_iucv= kernel command line parameter - * @val: Parameter value (numeric) - */ -static int __init hvc_iucv_config(char *val) -{ - return strict_strtoul(val, 10, &hvc_iucv_devices); -} - - -device_initcall(hvc_iucv_init); -__setup("hvc_iucv=", hvc_iucv_config); -core_param(hvc_iucv_allow, hvc_iucv_filter, vmidfilter, 0640); diff --git a/drivers/char/hvc_rtas.c b/drivers/char/hvc_rtas.c deleted file mode 100644 index 61c4a61558d..00000000000 --- a/drivers/char/hvc_rtas.c +++ /dev/null @@ -1,133 +0,0 @@ -/* - * IBM RTAS driver interface to hvc_console.c - * - * (C) Copyright IBM Corporation 2001-2005 - * (C) Copyright Red Hat, Inc. 2005 - * - * Author(s): Maximino Augilar <IBM STI Design Center> - * : Ryan S. Arnold <rsa@us.ibm.com> - * : Utz Bacher <utz.bacher@de.ibm.com> - * : David Woodhouse <dwmw2@infradead.org> - * - * inspired by drivers/char/hvc_console.c - * written by Anton Blanchard and Paul Mackerras - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2 of the License, or - * (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA - */ - -#include <linux/console.h> -#include <linux/delay.h> -#include <linux/err.h> -#include <linux/init.h> -#include <linux/moduleparam.h> -#include <linux/types.h> - -#include <asm/irq.h> -#include <asm/rtas.h> -#include "hvc_console.h" - -#define hvc_rtas_cookie 0x67781e15 -struct hvc_struct *hvc_rtas_dev; - -static int rtascons_put_char_token = RTAS_UNKNOWN_SERVICE; -static int rtascons_get_char_token = RTAS_UNKNOWN_SERVICE; - -static inline int hvc_rtas_write_console(uint32_t vtermno, const char *buf, - int count) -{ - int i; - - for (i = 0; i < count; i++) { - if (rtas_call(rtascons_put_char_token, 1, 1, NULL, buf[i])) - break; - } - - return i; -} - -static int hvc_rtas_read_console(uint32_t vtermno, char *buf, int count) -{ - int i, c; - - for (i = 0; i < count; i++) { - if (rtas_call(rtascons_get_char_token, 0, 2, &c)) - break; - - buf[i] = c; - } - - return i; -} - -static const struct hv_ops hvc_rtas_get_put_ops = { - .get_chars = hvc_rtas_read_console, - .put_chars = hvc_rtas_write_console, -}; - -static int __init hvc_rtas_init(void) -{ - struct hvc_struct *hp; - - if (rtascons_put_char_token == RTAS_UNKNOWN_SERVICE) - rtascons_put_char_token = rtas_token("put-term-char"); - if (rtascons_put_char_token == RTAS_UNKNOWN_SERVICE) - return -EIO; - - if (rtascons_get_char_token == RTAS_UNKNOWN_SERVICE) - rtascons_get_char_token = rtas_token("get-term-char"); - if (rtascons_get_char_token == RTAS_UNKNOWN_SERVICE) - return -EIO; - - BUG_ON(hvc_rtas_dev); - - /* Allocate an hvc_struct for the console device we instantiated - * earlier. Save off hp so that we can return it on exit */ - hp = hvc_alloc(hvc_rtas_cookie, NO_IRQ, &hvc_rtas_get_put_ops, 16); - if (IS_ERR(hp)) - return PTR_ERR(hp); - - hvc_rtas_dev = hp; - - return 0; -} -module_init(hvc_rtas_init); - -/* This will tear down the tty portion of the driver */ -static void __exit hvc_rtas_exit(void) -{ - /* Really the fun isn't over until the worker thread breaks down and - * the tty cleans up */ - if (hvc_rtas_dev) - hvc_remove(hvc_rtas_dev); -} -module_exit(hvc_rtas_exit); - -/* This will happen prior to module init. There is no tty at this time? */ -static int __init hvc_rtas_console_init(void) -{ - rtascons_put_char_token = rtas_token("put-term-char"); - if (rtascons_put_char_token == RTAS_UNKNOWN_SERVICE) - return -EIO; - - rtascons_get_char_token = rtas_token("get-term-char"); - if (rtascons_get_char_token == RTAS_UNKNOWN_SERVICE) - return -EIO; - - hvc_instantiate(hvc_rtas_cookie, 0, &hvc_rtas_get_put_ops); - add_preferred_console("hvc", 0, NULL); - - return 0; -} -console_initcall(hvc_rtas_console_init); diff --git a/drivers/char/hvc_tile.c b/drivers/char/hvc_tile.c deleted file mode 100644 index 7a84a059547..00000000000 --- a/drivers/char/hvc_tile.c +++ /dev/null @@ -1,68 +0,0 @@ -/* - * Copyright 2010 Tilera Corporation. All Rights Reserved. - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License - * as published by the Free Software Foundation, version 2. - * - * This program is distributed in the hope that it will be useful, but - * WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or - * NON INFRINGEMENT. See the GNU General Public License for - * more details. - * - * Tilera TILE Processor hypervisor console - */ - -#include <linux/console.h> -#include <linux/delay.h> -#include <linux/err.h> -#include <linux/init.h> -#include <linux/moduleparam.h> -#include <linux/types.h> - -#include <hv/hypervisor.h> - -#include "hvc_console.h" - -static int hvc_tile_put_chars(uint32_t vt, const char *buf, int count) -{ - return hv_console_write((HV_VirtAddr)buf, count); -} - -static int hvc_tile_get_chars(uint32_t vt, char *buf, int count) -{ - int i, c; - - for (i = 0; i < count; ++i) { - c = hv_console_read_if_ready(); - if (c < 0) - break; - buf[i] = c; - } - - return i; -} - -static const struct hv_ops hvc_tile_get_put_ops = { - .get_chars = hvc_tile_get_chars, - .put_chars = hvc_tile_put_chars, -}; - -static int __init hvc_tile_console_init(void) -{ - extern void disable_early_printk(void); - hvc_instantiate(0, 0, &hvc_tile_get_put_ops); - add_preferred_console("hvc", 0, NULL); - disable_early_printk(); - return 0; -} -console_initcall(hvc_tile_console_init); - -static int __init hvc_tile_init(void) -{ - struct hvc_struct *s; - s = hvc_alloc(0, 0, &hvc_tile_get_put_ops, 128); - return IS_ERR(s) ? PTR_ERR(s) : 0; -} -device_initcall(hvc_tile_init); diff --git a/drivers/char/hvc_udbg.c b/drivers/char/hvc_udbg.c deleted file mode 100644 index b0957e61a7b..00000000000 --- a/drivers/char/hvc_udbg.c +++ /dev/null @@ -1,96 +0,0 @@ -/* - * udbg interface to hvc_console.c - * - * (C) Copyright David Gibson, IBM Corporation 2008. - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2 of the License, or - * (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA - */ - -#include <linux/console.h> -#include <linux/delay.h> -#include <linux/err.h> -#include <linux/init.h> -#include <linux/moduleparam.h> -#include <linux/types.h> -#include <linux/irq.h> - -#include <asm/udbg.h> - -#include "hvc_console.h" - -struct hvc_struct *hvc_udbg_dev; - -static int hvc_udbg_put(uint32_t vtermno, const char *buf, int count) -{ - int i; - - for (i = 0; i < count; i++) - udbg_putc(buf[i]); - - return i; -} - -static int hvc_udbg_get(uint32_t vtermno, char *buf, int count) -{ - int i, c; - - if (!udbg_getc_poll) - return 0; - - for (i = 0; i < count; i++) { - if ((c = udbg_getc_poll()) == -1) - break; - buf[i] = c; - } - - return i; -} - -static const struct hv_ops hvc_udbg_ops = { - .get_chars = hvc_udbg_get, - .put_chars = hvc_udbg_put, -}; - -static int __init hvc_udbg_init(void) -{ - struct hvc_struct *hp; - - BUG_ON(hvc_udbg_dev); - - hp = hvc_alloc(0, NO_IRQ, &hvc_udbg_ops, 16); - if (IS_ERR(hp)) - return PTR_ERR(hp); - - hvc_udbg_dev = hp; - - return 0; -} -module_init(hvc_udbg_init); - -static void __exit hvc_udbg_exit(void) -{ - if (hvc_udbg_dev) - hvc_remove(hvc_udbg_dev); -} -module_exit(hvc_udbg_exit); - -static int __init hvc_udbg_console_init(void) -{ - hvc_instantiate(0, 0, &hvc_udbg_ops); - add_preferred_console("hvc", 0, NULL); - - return 0; -} -console_initcall(hvc_udbg_console_init); diff --git a/drivers/char/hvc_vio.c b/drivers/char/hvc_vio.c deleted file mode 100644 index 5e2f52b3332..00000000000 --- a/drivers/char/hvc_vio.c +++ /dev/null @@ -1,173 +0,0 @@ -/* - * vio driver interface to hvc_console.c - * - * This code was moved here to allow the remaing code to be reused as a - * generic polling mode with semi-reliable transport driver core to the - * console and tty subsystems. - * - * - * Copyright (C) 2001 Anton Blanchard <anton@au.ibm.com>, IBM - * Copyright (C) 2001 Paul Mackerras <paulus@au.ibm.com>, IBM - * Copyright (C) 2004 Benjamin Herrenschmidt <benh@kernel.crashing.org>, IBM Corp. - * Copyright (C) 2004 IBM Corporation - * - * Additional Author(s): - * Ryan S. Arnold <rsa@us.ibm.com> - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2 of the License, or - * (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA - */ - -#include <linux/types.h> -#include <linux/init.h> - -#include <asm/hvconsole.h> -#include <asm/vio.h> -#include <asm/prom.h> -#include <asm/firmware.h> - -#include "hvc_console.h" - -static const char hvc_driver_name[] = "hvc_console"; - -static struct vio_device_id hvc_driver_table[] __devinitdata = { - {"serial", "hvterm1"}, - { "", "" } -}; -MODULE_DEVICE_TABLE(vio, hvc_driver_table); - -static int filtered_get_chars(uint32_t vtermno, char *buf, int count) -{ - unsigned long got; - int i; - - /* - * Vio firmware will read up to SIZE_VIO_GET_CHARS at its own discretion - * so we play safe and avoid the situation where got > count which could - * overload the flip buffer. - */ - if (count < SIZE_VIO_GET_CHARS) - return -EAGAIN; - - got = hvc_get_chars(vtermno, buf, count); - - /* - * Work around a HV bug where it gives us a null - * after every \r. -- paulus - */ - for (i = 1; i < got; ++i) { - if (buf[i] == 0 && buf[i-1] == '\r') { - --got; - if (i < got) - memmove(&buf[i], &buf[i+1], - got - i); - } - } - return got; -} - -static const struct hv_ops hvc_get_put_ops = { - .get_chars = filtered_get_chars, - .put_chars = hvc_put_chars, - .notifier_add = notifier_add_irq, - .notifier_del = notifier_del_irq, - .notifier_hangup = notifier_hangup_irq, -}; - -static int __devinit hvc_vio_probe(struct vio_dev *vdev, - const struct vio_device_id *id) -{ - struct hvc_struct *hp; - - /* probed with invalid parameters. */ - if (!vdev || !id) - return -EPERM; - - hp = hvc_alloc(vdev->unit_address, vdev->irq, &hvc_get_put_ops, - MAX_VIO_PUT_CHARS); - if (IS_ERR(hp)) - return PTR_ERR(hp); - dev_set_drvdata(&vdev->dev, hp); - - return 0; -} - -static int __devexit hvc_vio_remove(struct vio_dev *vdev) -{ - struct hvc_struct *hp = dev_get_drvdata(&vdev->dev); - - return hvc_remove(hp); -} - -static struct vio_driver hvc_vio_driver = { - .id_table = hvc_driver_table, - .probe = hvc_vio_probe, - .remove = __devexit_p(hvc_vio_remove), - .driver = { - .name = hvc_driver_name, - .owner = THIS_MODULE, - } -}; - -static int __init hvc_vio_init(void) -{ - int rc; - - if (firmware_has_feature(FW_FEATURE_ISERIES)) - return -EIO; - - /* Register as a vio device to receive callbacks */ - rc = vio_register_driver(&hvc_vio_driver); - - return rc; -} -module_init(hvc_vio_init); /* after drivers/char/hvc_console.c */ - -static void __exit hvc_vio_exit(void) -{ - vio_unregister_driver(&hvc_vio_driver); -} -module_exit(hvc_vio_exit); - -/* the device tree order defines our numbering */ -static int hvc_find_vtys(void) -{ - struct device_node *vty; - int num_found = 0; - - for (vty = of_find_node_by_name(NULL, "vty"); vty != NULL; - vty = of_find_node_by_name(vty, "vty")) { - const uint32_t *vtermno; - - /* We have statically defined space for only a certain number - * of console adapters. - */ - if (num_found >= MAX_NR_HVC_CONSOLES) { - of_node_put(vty); - break; - } - - vtermno = of_get_property(vty, "reg", NULL); - if (!vtermno) - continue; - - if (of_device_is_compatible(vty, "hvterm1")) { - hvc_instantiate(*vtermno, num_found, &hvc_get_put_ops); - ++num_found; - } - } - - return num_found; -} -console_initcall(hvc_find_vtys); diff --git a/drivers/char/hvc_xen.c b/drivers/char/hvc_xen.c deleted file mode 100644 index 3740e327f18..00000000000 --- a/drivers/char/hvc_xen.c +++ /dev/null @@ -1,271 +0,0 @@ -/* - * xen console driver interface to hvc_console.c - * - * (c) 2007 Gerd Hoffmann <kraxel@suse.de> - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2 of the License, or - * (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA - */ - -#include <linux/console.h> -#include <linux/delay.h> -#include <linux/err.h> -#include <linux/init.h> -#include <linux/types.h> - -#include <asm/xen/hypervisor.h> - -#include <xen/xen.h> -#include <xen/page.h> -#include <xen/events.h> -#include <xen/interface/io/console.h> -#include <xen/hvc-console.h> - -#include "hvc_console.h" - -#define HVC_COOKIE 0x58656e /* "Xen" in hex */ - -static struct hvc_struct *hvc; -static int xencons_irq; - -/* ------------------------------------------------------------------ */ - -static unsigned long console_pfn = ~0ul; - -static inline struct xencons_interface *xencons_interface(void) -{ - if (console_pfn == ~0ul) - return mfn_to_virt(xen_start_info->console.domU.mfn); - else - return __va(console_pfn << PAGE_SHIFT); -} - -static inline void notify_daemon(void) -{ - /* Use evtchn: this is called early, before irq is set up. */ - notify_remote_via_evtchn(xen_start_info->console.domU.evtchn); -} - -static int __write_console(const char *data, int len) -{ - struct xencons_interface *intf = xencons_interface(); - XENCONS_RING_IDX cons, prod; - int sent = 0; - - cons = intf->out_cons; - prod = intf->out_prod; - mb(); /* update queue values before going on */ - BUG_ON((prod - cons) > sizeof(intf->out)); - - while ((sent < len) && ((prod - cons) < sizeof(intf->out))) - intf->out[MASK_XENCONS_IDX(prod++, intf->out)] = data[sent++]; - - wmb(); /* write ring before updating pointer */ - intf->out_prod = prod; - - if (sent) - notify_daemon(); - return sent; -} - -static int domU_write_console(uint32_t vtermno, const char *data, int len) -{ - int ret = len; - - /* - * Make sure the whole buffer is emitted, polling if - * necessary. We don't ever want to rely on the hvc daemon - * because the most interesting console output is when the - * kernel is crippled. - */ - while (len) { - int sent = __write_console(data, len); - - data += sent; - len -= sent; - - if (unlikely(len)) - HYPERVISOR_sched_op(SCHEDOP_yield, NULL); - } - - return ret; -} - -static int domU_read_console(uint32_t vtermno, char *buf, int len) -{ - struct xencons_interface *intf = xencons_interface(); - XENCONS_RING_IDX cons, prod; - int recv = 0; - - cons = intf->in_cons; - prod = intf->in_prod; - mb(); /* get pointers before reading ring */ - BUG_ON((prod - cons) > sizeof(intf->in)); - - while (cons != prod && recv < len) - buf[recv++] = intf->in[MASK_XENCONS_IDX(cons++, intf->in)]; - - mb(); /* read ring before consuming */ - intf->in_cons = cons; - - notify_daemon(); - return recv; -} - -static struct hv_ops domU_hvc_ops = { - .get_chars = domU_read_console, - .put_chars = domU_write_console, - .notifier_add = notifier_add_irq, - .notifier_del = notifier_del_irq, - .notifier_hangup = notifier_hangup_irq, -}; - -static int dom0_read_console(uint32_t vtermno, char *buf, int len) -{ - return HYPERVISOR_console_io(CONSOLEIO_read, len, buf); -} - -/* - * Either for a dom0 to write to the system console, or a domU with a - * debug version of Xen - */ -static int dom0_write_console(uint32_t vtermno, const char *str, int len) -{ - int rc = HYPERVISOR_console_io(CONSOLEIO_write, len, (char *)str); - if (rc < 0) - return 0; - - return len; -} - -static struct hv_ops dom0_hvc_ops = { - .get_chars = dom0_read_console, - .put_chars = dom0_write_console, - .notifier_add = notifier_add_irq, - .notifier_del = notifier_del_irq, - .notifier_hangup = notifier_hangup_irq, -}; - -static int __init xen_hvc_init(void) -{ - struct hvc_struct *hp; - struct hv_ops *ops; - - if (!xen_pv_domain()) - return -ENODEV; - - if (xen_initial_domain()) { - ops = &dom0_hvc_ops; - xencons_irq = bind_virq_to_irq(VIRQ_CONSOLE, 0); - } else { - if (!xen_start_info->console.domU.evtchn) - return -ENODEV; - - ops = &domU_hvc_ops; - xencons_irq = bind_evtchn_to_irq(xen_start_info->console.domU.evtchn); - } - if (xencons_irq < 0) - xencons_irq = 0; /* NO_IRQ */ - - hp = hvc_alloc(HVC_COOKIE, xencons_irq, ops, 256); - if (IS_ERR(hp)) - return PTR_ERR(hp); - - hvc = hp; - - console_pfn = mfn_to_pfn(xen_start_info->console.domU.mfn); - - return 0; -} - -void xen_console_resume(void) -{ - if (xencons_irq) - rebind_evtchn_irq(xen_start_info->console.domU.evtchn, xencons_irq); -} - -static void __exit xen_hvc_fini(void) -{ - if (hvc) - hvc_remove(hvc); -} - -static int xen_cons_init(void) -{ - struct hv_ops *ops; - - if (!xen_pv_domain()) - return 0; - - if (xen_initial_domain()) - ops = &dom0_hvc_ops; - else - ops = &domU_hvc_ops; - - hvc_instantiate(HVC_COOKIE, 0, ops); - return 0; -} - -module_init(xen_hvc_init); -module_exit(xen_hvc_fini); -console_initcall(xen_cons_init); - -#ifdef CONFIG_EARLY_PRINTK -static void xenboot_write_console(struct console *console, const char *string, - unsigned len) -{ - unsigned int linelen, off = 0; - const char *pos; - - dom0_write_console(0, string, len); - - if (xen_initial_domain()) - return; - - domU_write_console(0, "(early) ", 8); - while (off < len && NULL != (pos = strchr(string+off, '\n'))) { - linelen = pos-string+off; - if (off + linelen > len) - break; - domU_write_console(0, string+off, linelen); - domU_write_console(0, "\r\n", 2); - off += linelen + 1; - } - if (off < len) - domU_write_console(0, string+off, len-off); -} - -struct console xenboot_console = { - .name = "xenboot", - .write = xenboot_write_console, - .flags = CON_PRINTBUFFER | CON_BOOT | CON_ANYTIME, -}; -#endif /* CONFIG_EARLY_PRINTK */ - -void xen_raw_console_write(const char *str) -{ - dom0_write_console(0, str, strlen(str)); -} - -void xen_raw_printk(const char *fmt, ...) -{ - static char buf[512]; - va_list ap; - - va_start(ap, fmt); - vsnprintf(buf, sizeof(buf), fmt, ap); - va_end(ap); - - xen_raw_console_write(buf); -} diff --git a/drivers/char/hvcs.c b/drivers/char/hvcs.c deleted file mode 100644 index bedc6c1b6fa..00000000000 --- a/drivers/char/hvcs.c +++ /dev/null @@ -1,1604 +0,0 @@ -/* - * IBM eServer Hypervisor Virtual Console Server Device Driver - * Copyright (C) 2003, 2004 IBM Corp. - * Ryan S. Arnold (rsa@us.ibm.com) - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2 of the License, or - * (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA - * - * Author(s) : Ryan S. Arnold <rsa@us.ibm.com> - * - * This is the device driver for the IBM Hypervisor Virtual Console Server, - * "hvcs". The IBM hvcs provides a tty driver interface to allow Linux - * user space applications access to the system consoles of logically - * partitioned operating systems, e.g. Linux, running on the same partitioned - * Power5 ppc64 system. Physical hardware consoles per partition are not - * practical on this hardware so system consoles are accessed by this driver - * using inter-partition firmware interfaces to virtual terminal devices. - * - * A vty is known to the HMC as a "virtual serial server adapter". It is a - * virtual terminal device that is created by firmware upon partition creation - * to act as a partitioned OS's console device. - * - * Firmware dynamically (via hotplug) exposes vty-servers to a running ppc64 - * Linux system upon their creation by the HMC or their exposure during boot. - * The non-user interactive backend of this driver is implemented as a vio - * device driver so that it can receive notification of vty-server lifetimes - * after it registers with the vio bus to handle vty-server probe and remove - * callbacks. - * - * Many vty-servers can be configured to connect to one vty, but a vty can - * only be actively connected to by a single vty-server, in any manner, at one - * time. If the HMC is currently hosting the console for a target Linux - * partition; attempts to open the tty device to the partition's console using - * the hvcs on any partition will return -EBUSY with every open attempt until - * the HMC frees the connection between its vty-server and the desired - * partition's vty device. Conversely, a vty-server may only be connected to - * a single vty at one time even though it may have several configured vty - * partner possibilities. - * - * Firmware does not provide notification of vty partner changes to this - * driver. This means that an HMC Super Admin may add or remove partner vtys - * from a vty-server's partner list but the changes will not be signaled to - * the vty-server. Firmware only notifies the driver when a vty-server is - * added or removed from the system. To compensate for this deficiency, this - * driver implements a sysfs update attribute which provides a method for - * rescanning partner information upon a user's request. - * - * Each vty-server, prior to being exposed to this driver is reference counted - * using the 2.6 Linux kernel kref construct. - * - * For direction on installation and usage of this driver please reference - * Documentation/powerpc/hvcs.txt. - */ - -#include <linux/device.h> -#include <linux/init.h> -#include <linux/interrupt.h> -#include <linux/kernel.h> -#include <linux/kref.h> -#include <linux/kthread.h> -#include <linux/list.h> -#include <linux/major.h> -#include <linux/module.h> -#include <linux/moduleparam.h> -#include <linux/sched.h> -#include <linux/slab.h> -#include <linux/spinlock.h> -#include <linux/stat.h> -#include <linux/tty.h> -#include <linux/tty_flip.h> -#include <asm/hvconsole.h> -#include <asm/hvcserver.h> -#include <asm/uaccess.h> -#include <asm/vio.h> - -/* - * 1.3.0 -> 1.3.1 In hvcs_open memset(..,0x00,..) instead of memset(..,0x3F,00). - * Removed braces around single statements following conditionals. Removed '= - * 0' after static int declarations since these default to zero. Removed - * list_for_each_safe() and replaced with list_for_each_entry() in - * hvcs_get_by_index(). The 'safe' version is un-needed now that the driver is - * using spinlocks. Changed spin_lock_irqsave() to spin_lock() when locking - * hvcs_structs_lock and hvcs_pi_lock since these are not touched in an int - * handler. Initialized hvcs_structs_lock and hvcs_pi_lock to - * SPIN_LOCK_UNLOCKED at declaration time rather than in hvcs_module_init(). - * Added spin_lock around list_del() in destroy_hvcs_struct() to protect the - * list traversals from a deletion. Removed '= NULL' from pointer declaration - * statements since they are initialized NULL by default. Removed wmb() - * instances from hvcs_try_write(). They probably aren't needed with locking in - * place. Added check and cleanup for hvcs_pi_buff = kmalloc() in - * hvcs_module_init(). Exposed hvcs_struct.index via a sysfs attribute so that - * the coupling between /dev/hvcs* and a vty-server can be automatically - * determined. Moved kobject_put() in hvcs_open outside of the - * spin_unlock_irqrestore(). - * - * 1.3.1 -> 1.3.2 Changed method for determining hvcs_struct->index and had it - * align with how the tty layer always assigns the lowest index available. This - * change resulted in a list of ints that denotes which indexes are available. - * Device additions and removals use the new hvcs_get_index() and - * hvcs_return_index() helper functions. The list is created with - * hvsc_alloc_index_list() and it is destroyed with hvcs_free_index_list(). - * Without these fixes hotplug vty-server adapter support goes crazy with this - * driver if the user removes a vty-server adapter. Moved free_irq() outside of - * the hvcs_final_close() function in order to get it out of the spinlock. - * Rearranged hvcs_close(). Cleaned up some printks and did some housekeeping - * on the changelog. Removed local CLC_LENGTH and used HVCS_CLC_LENGTH from - * arch/powerepc/include/asm/hvcserver.h - * - * 1.3.2 -> 1.3.3 Replaced yield() in hvcs_close() with tty_wait_until_sent() to - * prevent possible lockup with realtime scheduling as similarily pointed out by - * akpm in hvc_console. Changed resulted in the removal of hvcs_final_close() - * to reorder cleanup operations and prevent discarding of pending data during - * an hvcs_close(). Removed spinlock protection of hvcs_struct data members in - * hvcs_write_room() and hvcs_chars_in_buffer() because they aren't needed. - */ - -#define HVCS_DRIVER_VERSION "1.3.3" - -MODULE_AUTHOR("Ryan S. Arnold <rsa@us.ibm.com>"); -MODULE_DESCRIPTION("IBM hvcs (Hypervisor Virtual Console Server) Driver"); -MODULE_LICENSE("GPL"); -MODULE_VERSION(HVCS_DRIVER_VERSION); - -/* - * Wait this long per iteration while trying to push buffered data to the - * hypervisor before allowing the tty to complete a close operation. - */ -#define HVCS_CLOSE_WAIT (HZ/100) /* 1/10 of a second */ - -/* - * Since the Linux TTY code does not currently (2-04-2004) support dynamic - * addition of tty derived devices and we shouldn't allocate thousands of - * tty_device pointers when the number of vty-server & vty partner connections - * will most often be much lower than this, we'll arbitrarily allocate - * HVCS_DEFAULT_SERVER_ADAPTERS tty_structs and cdev's by default when we - * register the tty_driver. This can be overridden using an insmod parameter. - */ -#define HVCS_DEFAULT_SERVER_ADAPTERS 64 - -/* - * The user can't insmod with more than HVCS_MAX_SERVER_ADAPTERS hvcs device - * nodes as a sanity check. Theoretically there can be over 1 Billion - * vty-server & vty partner connections. - */ -#define HVCS_MAX_SERVER_ADAPTERS 1024 - -/* - * We let Linux assign us a major number and we start the minors at zero. There - * is no intuitive mapping between minor number and the target vty-server - * adapter except that each new vty-server adapter is always assigned to the - * smallest minor number available. - */ -#define HVCS_MINOR_START 0 - -/* - * The hcall interface involves putting 8 chars into each of two registers. - * We load up those 2 registers (in arch/powerpc/platforms/pseries/hvconsole.c) - * by casting char[16] to long[2]. It would work without __ALIGNED__, but a - * little (tiny) bit slower because an unaligned load is slower than aligned - * load. - */ -#define __ALIGNED__ __attribute__((__aligned__(8))) - -/* - * How much data can firmware send with each hvc_put_chars()? Maybe this - * should be moved into an architecture specific area. - */ -#define HVCS_BUFF_LEN 16 - -/* - * This is the maximum amount of data we'll let the user send us (hvcs_write) at - * once in a chunk as a sanity check. - */ -#define HVCS_MAX_FROM_USER 4096 - -/* - * Be careful when adding flags to this line discipline. Don't add anything - * that will cause echoing or we'll go into recursive loop echoing chars back - * and forth with the console drivers. - */ -static struct ktermios hvcs_tty_termios = { - .c_iflag = IGNBRK | IGNPAR, - .c_oflag = OPOST, - .c_cflag = B38400 | CS8 | CREAD | HUPCL, - .c_cc = INIT_C_CC, - .c_ispeed = 38400, - .c_ospeed = 38400 -}; - -/* - * This value is used to take the place of a command line parameter when the - * module is inserted. It starts as -1 and stays as such if the user doesn't - * specify a module insmod parameter. If they DO specify one then it is set to - * the value of the integer passed in. - */ -static int hvcs_parm_num_devs = -1; -module_param(hvcs_parm_num_devs, int, 0); - -static const char hvcs_driver_name[] = "hvcs"; -static const char hvcs_device_node[] = "hvcs"; -static const char hvcs_driver_string[] - = "IBM hvcs (Hypervisor Virtual Console Server) Driver"; - -/* Status of partner info rescan triggered via sysfs. */ -static int hvcs_rescan_status; - -static struct tty_driver *hvcs_tty_driver; - -/* - * In order to be somewhat sane this driver always associates the hvcs_struct - * index element with the numerically equal tty->index. This means that a - * hotplugged vty-server adapter will always map to the lowest index valued - * device node. If vty-servers were hotplug removed from the system and then - * new ones added the new vty-server may have the largest slot number of all - * the vty-server adapters in the partition but it may have the lowest dev node - * index of all the adapters due to the hole left by the hotplug removed - * adapter. There are a set of functions provided to get the lowest index for - * a new device as well as return the index to the list. This list is allocated - * with a number of elements equal to the number of device nodes requested when - * the module was inserted. - */ -static int *hvcs_index_list; - -/* - * How large is the list? This is kept for traversal since the list is - * dynamically created. - */ -static int hvcs_index_count; - -/* - * Used by the khvcsd to pick up I/O operations when the kernel_thread is - * already awake but potentially shifted to TASK_INTERRUPTIBLE state. - */ -static int hvcs_kicked; - -/* - * Use by the kthread construct for task operations like waking the sleeping - * thread and stopping the kthread. - */ -static struct task_struct *hvcs_task; - -/* - * We allocate this for the use of all of the hvcs_structs when they fetch - * partner info. - */ -static unsigned long *hvcs_pi_buff; - -/* Only allow one hvcs_struct to use the hvcs_pi_buff at a time. */ -static DEFINE_SPINLOCK(hvcs_pi_lock); - -/* One vty-server per hvcs_struct */ -struct hvcs_struct { - spinlock_t lock; - - /* - * This index identifies this hvcs device as the complement to a - * specific tty index. - */ - unsigned int index; - - struct tty_struct *tty; - int open_count; - - /* - * Used to tell the driver kernel_thread what operations need to take - * place upon this hvcs_struct instance. - */ - int todo_mask; - - /* - * This buffer is required so that when hvcs_write_room() reports that - * it can send HVCS_BUFF_LEN characters that it will buffer the full - * HVCS_BUFF_LEN characters if need be. This is essential for opost - * writes since they do not do high level buffering and expect to be - * able to send what the driver commits to sending buffering - * [e.g. tab to space conversions in n_tty.c opost()]. - */ - char buffer[HVCS_BUFF_LEN]; - int chars_in_buffer; - - /* - * Any variable below the kref is valid before a tty is connected and - * stays valid after the tty is disconnected. These shouldn't be - * whacked until the koject refcount reaches zero though some entries - * may be changed via sysfs initiatives. - */ - struct kref kref; /* ref count & hvcs_struct lifetime */ - int connected; /* is the vty-server currently connected to a vty? */ - uint32_t p_unit_address; /* partner unit address */ - uint32_t p_partition_ID; /* partner partition ID */ - char p_location_code[HVCS_CLC_LENGTH + 1]; /* CLC + Null Term */ - struct list_head next; /* list management */ - struct vio_dev *vdev; -}; - -/* Required to back map a kref to its containing object */ -#define from_kref(k) container_of(k, struct hvcs_struct, kref) - -static LIST_HEAD(hvcs_structs); -static DEFINE_SPINLOCK(hvcs_structs_lock); - -static void hvcs_unthrottle(struct tty_struct *tty); -static void hvcs_throttle(struct tty_struct *tty); -static irqreturn_t hvcs_handle_interrupt(int irq, void *dev_instance); - -static int hvcs_write(struct tty_struct *tty, - const unsigned char *buf, int count); -static int hvcs_write_room(struct tty_struct *tty); -static int hvcs_chars_in_buffer(struct tty_struct *tty); - -static int hvcs_has_pi(struct hvcs_struct *hvcsd); -static void hvcs_set_pi(struct hvcs_partner_info *pi, - struct hvcs_struct *hvcsd); -static int hvcs_get_pi(struct hvcs_struct *hvcsd); -static int hvcs_rescan_devices_list(void); - -static int hvcs_partner_connect(struct hvcs_struct *hvcsd); -static void hvcs_partner_free(struct hvcs_struct *hvcsd); - -static int hvcs_enable_device(struct hvcs_struct *hvcsd, - uint32_t unit_address, unsigned int irq, struct vio_dev *dev); - -static int hvcs_open(struct tty_struct *tty, struct file *filp); -static void hvcs_close(struct tty_struct *tty, struct file *filp); -static void hvcs_hangup(struct tty_struct * tty); - -static int __devinit hvcs_probe(struct vio_dev *dev, - const struct vio_device_id *id); -static int __devexit hvcs_remove(struct vio_dev *dev); -static int __init hvcs_module_init(void); -static void __exit hvcs_module_exit(void); - -#define HVCS_SCHED_READ 0x00000001 -#define HVCS_QUICK_READ 0x00000002 -#define HVCS_TRY_WRITE 0x00000004 -#define HVCS_READ_MASK (HVCS_SCHED_READ | HVCS_QUICK_READ) - -static inline struct hvcs_struct *from_vio_dev(struct vio_dev *viod) -{ - return dev_get_drvdata(&viod->dev); -} -/* The sysfs interface for the driver and devices */ - -static ssize_t hvcs_partner_vtys_show(struct device *dev, struct device_attribute *attr, char *buf) -{ - struct vio_dev *viod = to_vio_dev(dev); - struct hvcs_struct *hvcsd = from_vio_dev(viod); - unsigned long flags; - int retval; - - spin_lock_irqsave(&hvcsd->lock, flags); - retval = sprintf(buf, "%X\n", hvcsd->p_unit_address); - spin_unlock_irqrestore(&hvcsd->lock, flags); - return retval; -} -static DEVICE_ATTR(partner_vtys, S_IRUGO, hvcs_partner_vtys_show, NULL); - -static ssize_t hvcs_partner_clcs_show(struct device *dev, struct device_attribute *attr, char *buf) -{ - struct vio_dev *viod = to_vio_dev(dev); - struct hvcs_struct *hvcsd = from_vio_dev(viod); - unsigned long flags; - int retval; - - spin_lock_irqsave(&hvcsd->lock, flags); - retval = sprintf(buf, "%s\n", &hvcsd->p_location_code[0]); - spin_unlock_irqrestore(&hvcsd->lock, flags); - return retval; -} -static DEVICE_ATTR(partner_clcs, S_IRUGO, hvcs_partner_clcs_show, NULL); - -static ssize_t hvcs_current_vty_store(struct device *dev, struct device_attribute *attr, const char * buf, - size_t count) -{ - /* - * Don't need this feature at the present time because firmware doesn't - * yet support multiple partners. - */ - printk(KERN_INFO "HVCS: Denied current_vty change: -EPERM.\n"); - return -EPERM; -} - -static ssize_t hvcs_current_vty_show(struct device *dev, struct device_attribute *attr, char *buf) -{ - struct vio_dev *viod = to_vio_dev(dev); - struct hvcs_struct *hvcsd = from_vio_dev(viod); - unsigned long flags; - int retval; - - spin_lock_irqsave(&hvcsd->lock, flags); - retval = sprintf(buf, "%s\n", &hvcsd->p_location_code[0]); - spin_unlock_irqrestore(&hvcsd->lock, flags); - return retval; -} - -static DEVICE_ATTR(current_vty, - S_IRUGO | S_IWUSR, hvcs_current_vty_show, hvcs_current_vty_store); - -static ssize_t hvcs_vterm_state_store(struct device *dev, struct device_attribute *attr, const char *buf, - size_t count) -{ - struct vio_dev *viod = to_vio_dev(dev); - struct hvcs_struct *hvcsd = from_vio_dev(viod); - unsigned long flags; - - /* writing a '0' to this sysfs entry will result in the disconnect. */ - if (simple_strtol(buf, NULL, 0) != 0) - return -EINVAL; - - spin_lock_irqsave(&hvcsd->lock, flags); - - if (hvcsd->open_count > 0) { - spin_unlock_irqrestore(&hvcsd->lock, flags); - printk(KERN_INFO "HVCS: vterm state unchanged. " - "The hvcs device node is still in use.\n"); - return -EPERM; - } - - if (hvcsd->connected == 0) { - spin_unlock_irqrestore(&hvcsd->lock, flags); - printk(KERN_INFO "HVCS: vterm state unchanged. The" - " vty-server is not connected to a vty.\n"); - return -EPERM; - } - - hvcs_partner_free(hvcsd); - printk(KERN_INFO "HVCS: Closed vty-server@%X and" - " partner vty@%X:%d connection.\n", - hvcsd->vdev->unit_address, - hvcsd->p_unit_address, - (uint32_t)hvcsd->p_partition_ID); - - spin_unlock_irqrestore(&hvcsd->lock, flags); - return count; -} - -static ssize_t hvcs_vterm_state_show(struct device *dev, struct device_attribute *attr, char *buf) -{ - struct vio_dev *viod = to_vio_dev(dev); - struct hvcs_struct *hvcsd = from_vio_dev(viod); - unsigned long flags; - int retval; - - spin_lock_irqsave(&hvcsd->lock, flags); - retval = sprintf(buf, "%d\n", hvcsd->connected); - spin_unlock_irqrestore(&hvcsd->lock, flags); - return retval; -} -static DEVICE_ATTR(vterm_state, S_IRUGO | S_IWUSR, - hvcs_vterm_state_show, hvcs_vterm_state_store); - -static ssize_t hvcs_index_show(struct device *dev, struct device_attribute *attr, char *buf) -{ - struct vio_dev *viod = to_vio_dev(dev); - struct hvcs_struct *hvcsd = from_vio_dev(viod); - unsigned long flags; - int retval; - - spin_lock_irqsave(&hvcsd->lock, flags); - retval = sprintf(buf, "%d\n", hvcsd->index); - spin_unlock_irqrestore(&hvcsd->lock, flags); - return retval; -} - -static DEVICE_ATTR(index, S_IRUGO, hvcs_index_show, NULL); - -static struct attribute *hvcs_attrs[] = { - &dev_attr_partner_vtys.attr, - &dev_attr_partner_clcs.attr, - &dev_attr_current_vty.attr, - &dev_attr_vterm_state.attr, - &dev_attr_index.attr, - NULL, -}; - -static struct attribute_group hvcs_attr_group = { - .attrs = hvcs_attrs, -}; - -static ssize_t hvcs_rescan_show(struct device_driver *ddp, char *buf) -{ - /* A 1 means it is updating, a 0 means it is done updating */ - return snprintf(buf, PAGE_SIZE, "%d\n", hvcs_rescan_status); -} - -static ssize_t hvcs_rescan_store(struct device_driver *ddp, const char * buf, - size_t count) -{ - if ((simple_strtol(buf, NULL, 0) != 1) - && (hvcs_rescan_status != 0)) - return -EINVAL; - - hvcs_rescan_status = 1; - printk(KERN_INFO "HVCS: rescanning partner info for all" - " vty-servers.\n"); - hvcs_rescan_devices_list(); - hvcs_rescan_status = 0; - return count; -} - -static DRIVER_ATTR(rescan, - S_IRUGO | S_IWUSR, hvcs_rescan_show, hvcs_rescan_store); - -static void hvcs_kick(void) -{ - hvcs_kicked = 1; - wmb(); - wake_up_process(hvcs_task); -} - -static void hvcs_unthrottle(struct tty_struct *tty) -{ - struct hvcs_struct *hvcsd = tty->driver_data; - unsigned long flags; - - spin_lock_irqsave(&hvcsd->lock, flags); - hvcsd->todo_mask |= HVCS_SCHED_READ; - spin_unlock_irqrestore(&hvcsd->lock, flags); - hvcs_kick(); -} - -static void hvcs_throttle(struct tty_struct *tty) -{ - struct hvcs_struct *hvcsd = tty->driver_data; - unsigned long flags; - - spin_lock_irqsave(&hvcsd->lock, flags); - vio_disable_interrupts(hvcsd->vdev); - spin_unlock_irqrestore(&hvcsd->lock, flags); -} - -/* - * If the device is being removed we don't have to worry about this interrupt - * handler taking any further interrupts because they are disabled which means - * the hvcs_struct will always be valid in this handler. - */ -static irqreturn_t hvcs_handle_interrupt(int irq, void *dev_instance) -{ - struct hvcs_struct *hvcsd = dev_instance; - - spin_lock(&hvcsd->lock); - vio_disable_interrupts(hvcsd->vdev); - hvcsd->todo_mask |= HVCS_SCHED_READ; - spin_unlock(&hvcsd->lock); - hvcs_kick(); - - return IRQ_HANDLED; -} - -/* This function must be called with the hvcsd->lock held */ -static void hvcs_try_write(struct hvcs_struct *hvcsd) -{ - uint32_t unit_address = hvcsd->vdev->unit_address; - struct tty_struct *tty = hvcsd->tty; - int sent; - - if (hvcsd->todo_mask & HVCS_TRY_WRITE) { - /* won't send partial writes */ - sent = hvc_put_chars(unit_address, - &hvcsd->buffer[0], - hvcsd->chars_in_buffer ); - if (sent > 0) { - hvcsd->chars_in_buffer = 0; - /* wmb(); */ - hvcsd->todo_mask &= ~(HVCS_TRY_WRITE); - /* wmb(); */ - - /* - * We are still obligated to deliver the data to the - * hypervisor even if the tty has been closed because - * we commited to delivering it. But don't try to wake - * a non-existent tty. - */ - if (tty) { - tty_wakeup(tty); - } - } - } -} - -static int hvcs_io(struct hvcs_struct *hvcsd) -{ - uint32_t unit_address; - struct tty_struct *tty; - char buf[HVCS_BUFF_LEN] __ALIGNED__; - unsigned long flags; - int got = 0; - - spin_lock_irqsave(&hvcsd->lock, flags); - - unit_address = hvcsd->vdev->unit_address; - tty = hvcsd->tty; - - hvcs_try_write(hvcsd); - - if (!tty || test_bit(TTY_THROTTLED, &tty->flags)) { - hvcsd->todo_mask &= ~(HVCS_READ_MASK); - goto bail; - } else if (!(hvcsd->todo_mask & (HVCS_READ_MASK))) - goto bail; - - /* remove the read masks */ - hvcsd->todo_mask &= ~(HVCS_READ_MASK); - - if (tty_buffer_request_room(tty, HVCS_BUFF_LEN) >= HVCS_BUFF_LEN) { - got = hvc_get_chars(unit_address, - &buf[0], - HVCS_BUFF_LEN); - tty_insert_flip_string(tty, buf, got); - } - - /* Give the TTY time to process the data we just sent. */ - if (got) - hvcsd->todo_mask |= HVCS_QUICK_READ; - - spin_unlock_irqrestore(&hvcsd->lock, flags); - /* This is synch because tty->low_latency == 1 */ - if(got) - tty_flip_buffer_push(tty); - - if (!got) { - /* Do this _after_ the flip_buffer_push */ - spin_lock_irqsave(&hvcsd->lock, flags); - vio_enable_interrupts(hvcsd->vdev); - spin_unlock_irqrestore(&hvcsd->lock, flags); - } - - return hvcsd->todo_mask; - - bail: - spin_unlock_irqrestore(&hvcsd->lock, flags); - return hvcsd->todo_mask; -} - -static int khvcsd(void *unused) -{ - struct hvcs_struct *hvcsd; - int hvcs_todo_mask; - - __set_current_state(TASK_RUNNING); - - do { - hvcs_todo_mask = 0; - hvcs_kicked = 0; - wmb(); - - spin_lock(&hvcs_structs_lock); - list_for_each_entry(hvcsd, &hvcs_structs, next) { - hvcs_todo_mask |= hvcs_io(hvcsd); - } - spin_unlock(&hvcs_structs_lock); - - /* - * If any of the hvcs adapters want to try a write or quick read - * don't schedule(), yield a smidgen then execute the hvcs_io - * thread again for those that want the write. - */ - if (hvcs_todo_mask & (HVCS_TRY_WRITE | HVCS_QUICK_READ)) { - yield(); - continue; - } - - set_current_state(TASK_INTERRUPTIBLE); - if (!hvcs_kicked) - schedule(); - __set_current_state(TASK_RUNNING); - } while (!kthread_should_stop()); - - return 0; -} - -static struct vio_device_id hvcs_driver_table[] __devinitdata= { - {"serial-server", "hvterm2"}, - { "", "" } -}; -MODULE_DEVICE_TABLE(vio, hvcs_driver_table); - -static void hvcs_return_index(int index) -{ - /* Paranoia check */ - if (!hvcs_index_list) - return; - if (index < 0 || index >= hvcs_index_count) - return; - if (hvcs_index_list[index] == -1) - return; - else - hvcs_index_list[index] = -1; -} - -/* callback when the kref ref count reaches zero */ -static void destroy_hvcs_struct(struct kref *kref) -{ - struct hvcs_struct *hvcsd = from_kref(kref); - struct vio_dev *vdev; - unsigned long flags; - - spin_lock(&hvcs_structs_lock); - spin_lock_irqsave(&hvcsd->lock, flags); - - /* the list_del poisons the pointers */ - list_del(&(hvcsd->next)); - - if (hvcsd->connected == 1) { - hvcs_partner_free(hvcsd); - printk(KERN_INFO "HVCS: Closed vty-server@%X and" - " partner vty@%X:%d connection.\n", - hvcsd->vdev->unit_address, - hvcsd->p_unit_address, - (uint32_t)hvcsd->p_partition_ID); - } - printk(KERN_INFO "HVCS: Destroyed hvcs_struct for vty-server@%X.\n", - hvcsd->vdev->unit_address); - - vdev = hvcsd->vdev; - hvcsd->vdev = NULL; - - hvcsd->p_unit_address = 0; - hvcsd->p_partition_ID = 0; - hvcs_return_index(hvcsd->index); - memset(&hvcsd->p_location_code[0], 0x00, HVCS_CLC_LENGTH + 1); - - spin_unlock_irqrestore(&hvcsd->lock, flags); - spin_unlock(&hvcs_structs_lock); - - sysfs_remove_group(&vdev->dev.kobj, &hvcs_attr_group); - - kfree(hvcsd); -} - -static int hvcs_get_index(void) -{ - int i; - /* Paranoia check */ - if (!hvcs_index_list) { - printk(KERN_ERR "HVCS: hvcs_index_list NOT valid!.\n"); - return -EFAULT; - } - /* Find the numerically lowest first free index. */ - for(i = 0; i < hvcs_index_count; i++) { - if (hvcs_index_list[i] == -1) { - hvcs_index_list[i] = 0; - return i; - } - } - return -1; -} - -static int __devinit hvcs_probe( - struct vio_dev *dev, - const struct vio_device_id *id) -{ - struct hvcs_struct *hvcsd; - int index; - int retval; - - if (!dev || !id) { - printk(KERN_ERR "HVCS: probed with invalid parameter.\n"); - return -EPERM; - } - - /* early to avoid cleanup on failure */ - index = hvcs_get_index(); - if (index < 0) { - return -EFAULT; - } - - hvcsd = kzalloc(sizeof(*hvcsd), GFP_KERNEL); - if (!hvcsd) - return -ENODEV; - - - spin_lock_init(&hvcsd->lock); - /* Automatically incs the refcount the first time */ - kref_init(&hvcsd->kref); - - hvcsd->vdev = dev; - dev_set_drvdata(&dev->dev, hvcsd); - - hvcsd->index = index; - - /* hvcsd->index = ++hvcs_struct_count; */ - hvcsd->chars_in_buffer = 0; - hvcsd->todo_mask = 0; - hvcsd->connected = 0; - - /* - * This will populate the hvcs_struct's partner info fields for the - * first time. - */ - if (hvcs_get_pi(hvcsd)) { - printk(KERN_ERR "HVCS: Failed to fetch partner" - " info for vty-server@%X on device probe.\n", - hvcsd->vdev->unit_address); - } - - /* - * If a user app opens a tty that corresponds to this vty-server before - * the hvcs_struct has been added to the devices list then the user app - * will get -ENODEV. - */ - spin_lock(&hvcs_structs_lock); - list_add_tail(&(hvcsd->next), &hvcs_structs); - spin_unlock(&hvcs_structs_lock); - - retval = sysfs_create_group(&dev->dev.kobj, &hvcs_attr_group); - if (retval) { - printk(KERN_ERR "HVCS: Can't create sysfs attrs for vty-server@%X\n", - hvcsd->vdev->unit_address); - return retval; - } - - printk(KERN_INFO "HVCS: vty-server@%X added to the vio bus.\n", dev->unit_address); - - /* - * DON'T enable interrupts here because there is no user to receive the - * data. - */ - return 0; -} - -static int __devexit hvcs_remove(struct vio_dev *dev) -{ - struct hvcs_struct *hvcsd = dev_get_drvdata(&dev->dev); - unsigned long flags; - struct tty_struct *tty; - - if (!hvcsd) - return -ENODEV; - - /* By this time the vty-server won't be getting any more interrupts */ - - spin_lock_irqsave(&hvcsd->lock, flags); - - tty = hvcsd->tty; - - spin_unlock_irqrestore(&hvcsd->lock, flags); - - /* - * Let the last holder of this object cause it to be removed, which - * would probably be tty_hangup below. - */ - kref_put(&hvcsd->kref, destroy_hvcs_struct); - - /* - * The hangup is a scheduled function which will auto chain call - * hvcs_hangup. The tty should always be valid at this time unless a - * simultaneous tty close already cleaned up the hvcs_struct. - */ - if (tty) - tty_hangup(tty); - - printk(KERN_INFO "HVCS: vty-server@%X removed from the" - " vio bus.\n", dev->unit_address); - return 0; -}; - -static struct vio_driver hvcs_vio_driver = { - .id_table = hvcs_driver_table, - .probe = hvcs_probe, - .remove = __devexit_p(hvcs_remove), - .driver = { - .name = hvcs_driver_name, - .owner = THIS_MODULE, - } -}; - -/* Only called from hvcs_get_pi please */ -static void hvcs_set_pi(struct hvcs_partner_info *pi, struct hvcs_struct *hvcsd) -{ - int clclength; - - hvcsd->p_unit_address = pi->unit_address; - hvcsd->p_partition_ID = pi->partition_ID; - clclength = strlen(&pi->location_code[0]); - if (clclength > HVCS_CLC_LENGTH) - clclength = HVCS_CLC_LENGTH; - - /* copy the null-term char too */ - strncpy(&hvcsd->p_location_code[0], - &pi->location_code[0], clclength + 1); -} - -/* - * Traverse the list and add the partner info that is found to the hvcs_struct - * struct entry. NOTE: At this time I know that partner info will return a - * single entry but in the future there may be multiple partner info entries per - * vty-server and you'll want to zero out that list and reset it. If for some - * reason you have an old version of this driver but there IS more than one - * partner info then hvcsd->p_* will hold the last partner info data from the - * firmware query. A good way to update this code would be to replace the three - * partner info fields in hvcs_struct with a list of hvcs_partner_info - * instances. - * - * This function must be called with the hvcsd->lock held. - */ -static int hvcs_get_pi(struct hvcs_struct *hvcsd) -{ - struct hvcs_partner_info *pi; - uint32_t unit_address = hvcsd->vdev->unit_address; - struct list_head head; - int retval; - - spin_lock(&hvcs_pi_lock); - if (!hvcs_pi_buff) { - spin_unlock(&hvcs_pi_lock); - return -EFAULT; - } - retval = hvcs_get_partner_info(unit_address, &head, hvcs_pi_buff); - spin_unlock(&hvcs_pi_lock); - if (retval) { - printk(KERN_ERR "HVCS: Failed to fetch partner" - " info for vty-server@%x.\n", unit_address); - return retval; - } - - /* nixes the values if the partner vty went away */ - hvcsd->p_unit_address = 0; - hvcsd->p_partition_ID = 0; - - list_for_each_entry(pi, &head, node) - hvcs_set_pi(pi, hvcsd); - - hvcs_free_partner_info(&head); - return 0; -} - -/* - * This function is executed by the driver "rescan" sysfs entry. It shouldn't - * be executed elsewhere, in order to prevent deadlock issues. - */ -static int hvcs_rescan_devices_list(void) -{ - struct hvcs_struct *hvcsd; - unsigned long flags; - - spin_lock(&hvcs_structs_lock); - - list_for_each_entry(hvcsd, &hvcs_structs, next) { - spin_lock_irqsave(&hvcsd->lock, flags); - hvcs_get_pi(hvcsd); - spin_unlock_irqrestore(&hvcsd->lock, flags); - } - - spin_unlock(&hvcs_structs_lock); - - return 0; -} - -/* - * Farm this off into its own function because it could be more complex once - * multiple partners support is added. This function should be called with - * the hvcsd->lock held. - */ -static int hvcs_has_pi(struct hvcs_struct *hvcsd) -{ - if ((!hvcsd->p_unit_address) || (!hvcsd->p_partition_ID)) - return 0; - return 1; -} - -/* - * NOTE: It is possible that the super admin removed a partner vty and then - * added a different vty as the new partner. - * - * This function must be called with the hvcsd->lock held. - */ -static int hvcs_partner_connect(struct hvcs_struct *hvcsd) -{ - int retval; - unsigned int unit_address = hvcsd->vdev->unit_address; - - /* - * If there wasn't any pi when the device was added it doesn't meant - * there isn't any now. This driver isn't notified when a new partner - * vty is added to a vty-server so we discover changes on our own. - * Please see comments in hvcs_register_connection() for justification - * of this bizarre code. - */ - retval = hvcs_register_connection(unit_address, - hvcsd->p_partition_ID, - hvcsd->p_unit_address); - if (!retval) { - hvcsd->connected = 1; - return 0; - } else if (retval != -EINVAL) - return retval; - - /* - * As per the spec re-get the pi and try again if -EINVAL after the - * first connection attempt. - */ - if (hvcs_get_pi(hvcsd)) - return -ENOMEM; - - if (!hvcs_has_pi(hvcsd)) - return -ENODEV; - - retval = hvcs_register_connection(unit_address, - hvcsd->p_partition_ID, - hvcsd->p_unit_address); - if (retval != -EINVAL) { - hvcsd->connected = 1; - return retval; - } - - /* - * EBUSY is the most likely scenario though the vty could have been - * removed or there really could be an hcall error due to the parameter - * data but thanks to ambiguous firmware return codes we can't really - * tell. - */ - printk(KERN_INFO "HVCS: vty-server or partner" - " vty is busy. Try again later.\n"); - return -EBUSY; -} - -/* This function must be called with the hvcsd->lock held */ -static void hvcs_partner_free(struct hvcs_struct *hvcsd) -{ - int retval; - do { - retval = hvcs_free_connection(hvcsd->vdev->unit_address); - } while (retval == -EBUSY); - hvcsd->connected = 0; -} - -/* This helper function must be called WITHOUT the hvcsd->lock held */ -static int hvcs_enable_device(struct hvcs_struct *hvcsd, uint32_t unit_address, - unsigned int irq, struct vio_dev *vdev) -{ - unsigned long flags; - int rc; - - /* - * It is possible that the vty-server was removed between the time that - * the conn was registered and now. - */ - if (!(rc = request_irq(irq, &hvcs_handle_interrupt, - IRQF_DISABLED, "ibmhvcs", hvcsd))) { - /* - * It is possible the vty-server was removed after the irq was - * requested but before we have time to enable interrupts. - */ - if (vio_enable_interrupts(vdev) == H_SUCCESS) - return 0; - else { - printk(KERN_ERR "HVCS: int enable failed for" - " vty-server@%X.\n", unit_address); - free_irq(irq, hvcsd); - } - } else - printk(KERN_ERR "HVCS: irq req failed for" - " vty-server@%X.\n", unit_address); - - spin_lock_irqsave(&hvcsd->lock, flags); - hvcs_partner_free(hvcsd); - spin_unlock_irqrestore(&hvcsd->lock, flags); - - return rc; - -} - -/* - * This always increments the kref ref count if the call is successful. - * Please remember to dec when you are done with the instance. - * - * NOTICE: Do NOT hold either the hvcs_struct.lock or hvcs_structs_lock when - * calling this function or you will get deadlock. - */ -static struct hvcs_struct *hvcs_get_by_index(int index) -{ - struct hvcs_struct *hvcsd = NULL; - unsigned long flags; - - spin_lock(&hvcs_structs_lock); - /* We can immediately discard OOB requests */ - if (index >= 0 && index < HVCS_MAX_SERVER_ADAPTERS) { - list_for_each_entry(hvcsd, &hvcs_structs, next) { - spin_lock_irqsave(&hvcsd->lock, flags); - if (hvcsd->index == index) { - kref_get(&hvcsd->kref); - spin_unlock_irqrestore(&hvcsd->lock, flags); - spin_unlock(&hvcs_structs_lock); - return hvcsd; - } - spin_unlock_irqrestore(&hvcsd->lock, flags); - } - hvcsd = NULL; - } - - spin_unlock(&hvcs_structs_lock); - return hvcsd; -} - -/* - * This is invoked via the tty_open interface when a user app connects to the - * /dev node. - */ -static int hvcs_open(struct tty_struct *tty, struct file *filp) -{ - struct hvcs_struct *hvcsd; - int rc, retval = 0; - unsigned long flags; - unsigned int irq; - struct vio_dev *vdev; - unsigned long unit_address; - - if (tty->driver_data) - goto fast_open; - - /* - * Is there a vty-server that shares the same index? - * This function increments the kref index. - */ - if (!(hvcsd = hvcs_get_by_index(tty->index))) { - printk(KERN_WARNING "HVCS: open failed, no device associated" - " with tty->index %d.\n", tty->index); - return -ENODEV; - } - - spin_lock_irqsave(&hvcsd->lock, flags); - - if (hvcsd->connected == 0) - if ((retval = hvcs_partner_connect(hvcsd))) - goto error_release; - - hvcsd->open_count = 1; - hvcsd->tty = tty; - tty->driver_data = hvcsd; - - memset(&hvcsd->buffer[0], 0x00, HVCS_BUFF_LEN); - - /* - * Save these in the spinlock for the enable operations that need them - * outside of the spinlock. - */ - irq = hvcsd->vdev->irq; - vdev = hvcsd->vdev; - unit_address = hvcsd->vdev->unit_address; - - hvcsd->todo_mask |= HVCS_SCHED_READ; - spin_unlock_irqrestore(&hvcsd->lock, flags); - - /* - * This must be done outside of the spinlock because it requests irqs - * and will grab the spinlock and free the connection if it fails. - */ - if (((rc = hvcs_enable_device(hvcsd, unit_address, irq, vdev)))) { - kref_put(&hvcsd->kref, destroy_hvcs_struct); - printk(KERN_WARNING "HVCS: enable device failed.\n"); - return rc; - } - - goto open_success; - -fast_open: - hvcsd = tty->driver_data; - - spin_lock_irqsave(&hvcsd->lock, flags); - kref_get(&hvcsd->kref); - hvcsd->open_count++; - hvcsd->todo_mask |= HVCS_SCHED_READ; - spin_unlock_irqrestore(&hvcsd->lock, flags); - -open_success: - hvcs_kick(); - - printk(KERN_INFO "HVCS: vty-server@%X connection opened.\n", - hvcsd->vdev->unit_address ); - - return 0; - -error_release: - spin_unlock_irqrestore(&hvcsd->lock, flags); - kref_put(&hvcsd->kref, destroy_hvcs_struct); - - printk(KERN_WARNING "HVCS: partner connect failed.\n"); - return retval; -} - -static void hvcs_close(struct tty_struct *tty, struct file *filp) -{ - struct hvcs_struct *hvcsd; - unsigned long flags; - int irq = NO_IRQ; - - /* - * Is someone trying to close the file associated with this device after - * we have hung up? If so tty->driver_data wouldn't be valid. - */ - if (tty_hung_up_p(filp)) - return; - - /* - * No driver_data means that this close was probably issued after a - * failed hvcs_open by the tty layer's release_dev() api and we can just - * exit cleanly. - */ - if (!tty->driver_data) - return; - - hvcsd = tty->driver_data; - - spin_lock_irqsave(&hvcsd->lock, flags); - if (--hvcsd->open_count == 0) { - - vio_disable_interrupts(hvcsd->vdev); - - /* - * NULL this early so that the kernel_thread doesn't try to - * execute any operations on the TTY even though it is obligated - * to deliver any pending I/O to the hypervisor. - */ - hvcsd->tty = NULL; - - irq = hvcsd->vdev->irq; - spin_unlock_irqrestore(&hvcsd->lock, flags); - - tty_wait_until_sent(tty, HVCS_CLOSE_WAIT); - - /* - * This line is important because it tells hvcs_open that this - * device needs to be re-configured the next time hvcs_open is - * called. - */ - tty->driver_data = NULL; - - free_irq(irq, hvcsd); - kref_put(&hvcsd->kref, destroy_hvcs_struct); - return; - } else if (hvcsd->open_count < 0) { - printk(KERN_ERR "HVCS: vty-server@%X open_count: %d" - " is missmanaged.\n", - hvcsd->vdev->unit_address, hvcsd->open_count); - } - - spin_unlock_irqrestore(&hvcsd->lock, flags); - kref_put(&hvcsd->kref, destroy_hvcs_struct); -} - -static void hvcs_hangup(struct tty_struct * tty) -{ - struct hvcs_struct *hvcsd = tty->driver_data; - unsigned long flags; - int temp_open_count; - int irq = NO_IRQ; - - spin_lock_irqsave(&hvcsd->lock, flags); - /* Preserve this so that we know how many kref refs to put */ - temp_open_count = hvcsd->open_count; - - /* - * Don't kref put inside the spinlock because the destruction - * callback may use the spinlock and it may get called before the - * spinlock has been released. - */ - vio_disable_interrupts(hvcsd->vdev); - - hvcsd->todo_mask = 0; - - /* I don't think the tty needs the hvcs_struct pointer after a hangup */ - hvcsd->tty->driver_data = NULL; - hvcsd->tty = NULL; - - hvcsd->open_count = 0; - - /* This will drop any buffered data on the floor which is OK in a hangup - * scenario. */ - memset(&hvcsd->buffer[0], 0x00, HVCS_BUFF_LEN); - hvcsd->chars_in_buffer = 0; - - irq = hvcsd->vdev->irq; - - spin_unlock_irqrestore(&hvcsd->lock, flags); - - free_irq(irq, hvcsd); - - /* - * We need to kref_put() for every open_count we have since the - * tty_hangup() function doesn't invoke a close per open connection on a - * non-console device. - */ - while(temp_open_count) { - --temp_open_count; - /* - * The final put will trigger destruction of the hvcs_struct. - * NOTE: If this hangup was signaled from user space then the - * final put will never happen. - */ - kref_put(&hvcsd->kref, destroy_hvcs_struct); - } -} - -/* - * NOTE: This is almost always from_user since user level apps interact with the - * /dev nodes. I'm trusting that if hvcs_write gets called and interrupted by - * hvcs_remove (which removes the target device and executes tty_hangup()) that - * tty_hangup will allow hvcs_write time to complete execution before it - * terminates our device. - */ -static int hvcs_write(struct tty_struct *tty, - const unsigned char *buf, int count) -{ - struct hvcs_struct *hvcsd = tty->driver_data; - unsigned int unit_address; - const unsigned char *charbuf; - unsigned long flags; - int total_sent = 0; - int tosend = 0; - int result = 0; - - /* - * If they don't check the return code off of their open they may - * attempt this even if there is no connected device. - */ - if (!hvcsd) - return -ENODEV; - - /* Reasonable size to prevent user level flooding */ - if (count > HVCS_MAX_FROM_USER) { - printk(KERN_WARNING "HVCS write: count being truncated to" - " HVCS_MAX_FROM_USER.\n"); - count = HVCS_MAX_FROM_USER; - } - - charbuf = buf; - - spin_lock_irqsave(&hvcsd->lock, flags); - - /* - * Somehow an open succedded but the device was removed or the - * connection terminated between the vty-server and partner vty during - * the middle of a write operation? This is a crummy place to do this - * but we want to keep it all in the spinlock. - */ - if (hvcsd->open_count <= 0) { - spin_unlock_irqrestore(&hvcsd->lock, flags); - return -ENODEV; - } - - unit_address = hvcsd->vdev->unit_address; - - while (count > 0) { - tosend = min(count, (HVCS_BUFF_LEN - hvcsd->chars_in_buffer)); - /* - * No more space, this probably means that the last call to - * hvcs_write() didn't succeed and the buffer was filled up. - */ - if (!tosend) - break; - - memcpy(&hvcsd->buffer[hvcsd->chars_in_buffer], - &charbuf[total_sent], - tosend); - - hvcsd->chars_in_buffer += tosend; - - result = 0; - - /* - * If this is true then we don't want to try writing to the - * hypervisor because that is the kernel_threads job now. We'll - * just add to the buffer. - */ - if (!(hvcsd->todo_mask & HVCS_TRY_WRITE)) - /* won't send partial writes */ - result = hvc_put_chars(unit_address, - &hvcsd->buffer[0], - hvcsd->chars_in_buffer); - - /* - * Since we know we have enough room in hvcsd->buffer for - * tosend we record that it was sent regardless of whether the - * hypervisor actually took it because we have it buffered. - */ - total_sent+=tosend; - count-=tosend; - if (result == 0) { - hvcsd->todo_mask |= HVCS_TRY_WRITE; - hvcs_kick(); - break; - } - - hvcsd->chars_in_buffer = 0; - /* - * Test after the chars_in_buffer reset otherwise this could - * deadlock our writes if hvc_put_chars fails. - */ - if (result < 0) - break; - } - - spin_unlock_irqrestore(&hvcsd->lock, flags); - - if (result == -1) - return -EIO; - else - return total_sent; -} - -/* - * This is really asking how much can we guarentee that we can send or that we - * absolutely WILL BUFFER if we can't send it. This driver MUST honor the - * return value, hence the reason for hvcs_struct buffering. - */ -static int hvcs_write_room(struct tty_struct *tty) -{ - struct hvcs_struct *hvcsd = tty->driver_data; - - if (!hvcsd || hvcsd->open_count <= 0) - return 0; - - return HVCS_BUFF_LEN - hvcsd->chars_in_buffer; -} - -static int hvcs_chars_in_buffer(struct tty_struct *tty) -{ - struct hvcs_struct *hvcsd = tty->driver_data; - - return hvcsd->chars_in_buffer; -} - -static const struct tty_operations hvcs_ops = { - .open = hvcs_open, - .close = hvcs_close, - .hangup = hvcs_hangup, - .write = hvcs_write, - .write_room = hvcs_write_room, - .chars_in_buffer = hvcs_chars_in_buffer, - .unthrottle = hvcs_unthrottle, - .throttle = hvcs_throttle, -}; - -static int hvcs_alloc_index_list(int n) -{ - int i; - - hvcs_index_list = kmalloc(n * sizeof(hvcs_index_count),GFP_KERNEL); - if (!hvcs_index_list) - return -ENOMEM; - hvcs_index_count = n; - for (i = 0; i < hvcs_index_count; i++) - hvcs_index_list[i] = -1; - return 0; -} - -static void hvcs_free_index_list(void) -{ - /* Paranoia check to be thorough. */ - kfree(hvcs_index_list); - hvcs_index_list = NULL; - hvcs_index_count = 0; -} - -static int __init hvcs_module_init(void) -{ - int rc; - int num_ttys_to_alloc; - - printk(KERN_INFO "Initializing %s\n", hvcs_driver_string); - - /* Has the user specified an overload with an insmod param? */ - if (hvcs_parm_num_devs <= 0 || - (hvcs_parm_num_devs > HVCS_MAX_SERVER_ADAPTERS)) { - num_ttys_to_alloc = HVCS_DEFAULT_SERVER_ADAPTERS; - } else - num_ttys_to_alloc = hvcs_parm_num_devs; - - hvcs_tty_driver = alloc_tty_driver(num_ttys_to_alloc); - if (!hvcs_tty_driver) - return -ENOMEM; - - if (hvcs_alloc_index_list(num_ttys_to_alloc)) { - rc = -ENOMEM; - goto index_fail; - } - - hvcs_tty_driver->owner = THIS_MODULE; - - hvcs_tty_driver->driver_name = hvcs_driver_name; - hvcs_tty_driver->name = hvcs_device_node; - - /* - * We'll let the system assign us a major number, indicated by leaving - * it blank. - */ - - hvcs_tty_driver->minor_start = HVCS_MINOR_START; - hvcs_tty_driver->type = TTY_DRIVER_TYPE_SYSTEM; - - /* - * We role our own so that we DONT ECHO. We can't echo because the - * device we are connecting to already echoes by default and this would - * throw us into a horrible recursive echo-echo-echo loop. - */ - hvcs_tty_driver->init_termios = hvcs_tty_termios; - hvcs_tty_driver->flags = TTY_DRIVER_REAL_RAW; - - tty_set_operations(hvcs_tty_driver, &hvcs_ops); - - /* - * The following call will result in sysfs entries that denote the - * dynamically assigned major and minor numbers for our devices. - */ - if (tty_register_driver(hvcs_tty_driver)) { - printk(KERN_ERR "HVCS: registration as a tty driver failed.\n"); - rc = -EIO; - goto register_fail; - } - - hvcs_pi_buff = kmalloc(PAGE_SIZE, GFP_KERNEL); - if (!hvcs_pi_buff) { - rc = -ENOMEM; - goto buff_alloc_fail; - } - - hvcs_task = kthread_run(khvcsd, NULL, "khvcsd"); - if (IS_ERR(hvcs_task)) { - printk(KERN_ERR "HVCS: khvcsd creation failed. Driver not loaded.\n"); - rc = -EIO; - goto kthread_fail; - } - - rc = vio_register_driver(&hvcs_vio_driver); - if (rc) { - printk(KERN_ERR "HVCS: can't register vio driver\n"); - goto vio_fail; - } - - /* - * This needs to be done AFTER the vio_register_driver() call or else - * the kobjects won't be initialized properly. - */ - rc = driver_create_file(&(hvcs_vio_driver.driver), &driver_attr_rescan); - if (rc) { - printk(KERN_ERR "HVCS: sysfs attr create failed\n"); - goto attr_fail; - } - - printk(KERN_INFO "HVCS: driver module inserted.\n"); - - return 0; - -attr_fail: - vio_unregister_driver(&hvcs_vio_driver); -vio_fail: - kthread_stop(hvcs_task); -kthread_fail: - kfree(hvcs_pi_buff); -buff_alloc_fail: - tty_unregister_driver(hvcs_tty_driver); -register_fail: - hvcs_free_index_list(); -index_fail: - put_tty_driver(hvcs_tty_driver); - hvcs_tty_driver = NULL; - return rc; -} - -static void __exit hvcs_module_exit(void) -{ - /* - * This driver receives hvcs_remove callbacks for each device upon - * module removal. - */ - - /* - * This synchronous operation will wake the khvcsd kthread if it is - * asleep and will return when khvcsd has terminated. - */ - kthread_stop(hvcs_task); - - spin_lock(&hvcs_pi_lock); - kfree(hvcs_pi_buff); - hvcs_pi_buff = NULL; - spin_unlock(&hvcs_pi_lock); - - driver_remove_file(&hvcs_vio_driver.driver, &driver_attr_rescan); - - vio_unregister_driver(&hvcs_vio_driver); - - tty_unregister_driver(hvcs_tty_driver); - - hvcs_free_index_list(); - - put_tty_driver(hvcs_tty_driver); - - printk(KERN_INFO "HVCS: driver module removed.\n"); -} - -module_init(hvcs_module_init); -module_exit(hvcs_module_exit); diff --git a/drivers/char/hvsi.c b/drivers/char/hvsi.c deleted file mode 100644 index 67a75a502c0..00000000000 --- a/drivers/char/hvsi.c +++ /dev/null @@ -1,1314 +0,0 @@ -/* - * Copyright (C) 2004 Hollis Blanchard <hollisb@us.ibm.com>, IBM - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2 of the License, or - * (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA - */ - -/* Host Virtual Serial Interface (HVSI) is a protocol between the hosted OS - * and the service processor on IBM pSeries servers. On these servers, there - * are no serial ports under the OS's control, and sometimes there is no other - * console available either. However, the service processor has two standard - * serial ports, so this over-complicated protocol allows the OS to control - * those ports by proxy. - * - * Besides data, the procotol supports the reading/writing of the serial - * port's DTR line, and the reading of the CD line. This is to allow the OS to - * control a modem attached to the service processor's serial port. Note that - * the OS cannot change the speed of the port through this protocol. - */ - -#undef DEBUG - -#include <linux/console.h> -#include <linux/ctype.h> -#include <linux/delay.h> -#include <linux/init.h> -#include <linux/interrupt.h> -#include <linux/module.h> -#include <linux/major.h> -#include <linux/kernel.h> -#include <linux/spinlock.h> -#include <linux/sysrq.h> -#include <linux/tty.h> -#include <linux/tty_flip.h> -#include <asm/hvcall.h> -#include <asm/hvconsole.h> -#include <asm/prom.h> -#include <asm/uaccess.h> -#include <asm/vio.h> -#include <asm/param.h> - -#define HVSI_MAJOR 229 -#define HVSI_MINOR 128 -#define MAX_NR_HVSI_CONSOLES 4 - -#define HVSI_TIMEOUT (5*HZ) -#define HVSI_VERSION 1 -#define HVSI_MAX_PACKET 256 -#define HVSI_MAX_READ 16 -#define HVSI_MAX_OUTGOING_DATA 12 -#define N_OUTBUF 12 - -/* - * we pass data via two 8-byte registers, so we would like our char arrays - * properly aligned for those loads. - */ -#define __ALIGNED__ __attribute__((__aligned__(sizeof(long)))) - -struct hvsi_struct { - struct delayed_work writer; - struct work_struct handshaker; - wait_queue_head_t emptyq; /* woken when outbuf is emptied */ - wait_queue_head_t stateq; /* woken when HVSI state changes */ - spinlock_t lock; - int index; - struct tty_struct *tty; - int count; - uint8_t throttle_buf[128]; - uint8_t outbuf[N_OUTBUF]; /* to implement write_room and chars_in_buffer */ - /* inbuf is for packet reassembly. leave a little room for leftovers. */ - uint8_t inbuf[HVSI_MAX_PACKET + HVSI_MAX_READ]; - uint8_t *inbuf_end; - int n_throttle; - int n_outbuf; - uint32_t vtermno; - uint32_t virq; - atomic_t seqno; /* HVSI packet sequence number */ - uint16_t mctrl; - uint8_t state; /* HVSI protocol state */ - uint8_t flags; -#ifdef CONFIG_MAGIC_SYSRQ - uint8_t sysrq; -#endif /* CONFIG_MAGIC_SYSRQ */ -}; -static struct hvsi_struct hvsi_ports[MAX_NR_HVSI_CONSOLES]; - -static struct tty_driver *hvsi_driver; -static int hvsi_count; -static int (*hvsi_wait)(struct hvsi_struct *hp, int state); - -enum HVSI_PROTOCOL_STATE { - HVSI_CLOSED, - HVSI_WAIT_FOR_VER_RESPONSE, - HVSI_WAIT_FOR_VER_QUERY, - HVSI_OPEN, - HVSI_WAIT_FOR_MCTRL_RESPONSE, - HVSI_FSP_DIED, -}; -#define HVSI_CONSOLE 0x1 - -#define VS_DATA_PACKET_HEADER 0xff -#define VS_CONTROL_PACKET_HEADER 0xfe -#define VS_QUERY_PACKET_HEADER 0xfd -#define VS_QUERY_RESPONSE_PACKET_HEADER 0xfc - -/* control verbs */ -#define VSV_SET_MODEM_CTL 1 /* to service processor only */ -#define VSV_MODEM_CTL_UPDATE 2 /* from service processor only */ -#define VSV_CLOSE_PROTOCOL 3 - -/* query verbs */ -#define VSV_SEND_VERSION_NUMBER 1 -#define VSV_SEND_MODEM_CTL_STATUS 2 - -/* yes, these masks are not consecutive. */ -#define HVSI_TSDTR 0x01 -#define HVSI_TSCD 0x20 - -struct hvsi_header { - uint8_t type; - uint8_t len; - uint16_t seqno; -} __attribute__((packed)); - -struct hvsi_data { - uint8_t type; - uint8_t len; - uint16_t seqno; - uint8_t data[HVSI_MAX_OUTGOING_DATA]; -} __attribute__((packed)); - -struct hvsi_control { - uint8_t type; - uint8_t len; - uint16_t seqno; - uint16_t verb; - /* optional depending on verb: */ - uint32_t word; - uint32_t mask; -} __attribute__((packed)); - -struct hvsi_query { - uint8_t type; - uint8_t len; - uint16_t seqno; - uint16_t verb; -} __attribute__((packed)); - -struct hvsi_query_response { - uint8_t type; - uint8_t len; - uint16_t seqno; - uint16_t verb; - uint16_t query_seqno; - union { - uint8_t version; - uint32_t mctrl_word; - } u; -} __attribute__((packed)); - - - -static inline int is_console(struct hvsi_struct *hp) -{ - return hp->flags & HVSI_CONSOLE; -} - -static inline int is_open(struct hvsi_struct *hp) -{ - /* if we're waiting for an mctrl then we're already open */ - return (hp->state == HVSI_OPEN) - || (hp->state == HVSI_WAIT_FOR_MCTRL_RESPONSE); -} - -static inline void print_state(struct hvsi_struct *hp) -{ -#ifdef DEBUG - static const char *state_names[] = { - "HVSI_CLOSED", - "HVSI_WAIT_FOR_VER_RESPONSE", - "HVSI_WAIT_FOR_VER_QUERY", - "HVSI_OPEN", - "HVSI_WAIT_FOR_MCTRL_RESPONSE", - "HVSI_FSP_DIED", - }; - const char *name = (hp->state < ARRAY_SIZE(state_names)) - ? state_names[hp->state] : "UNKNOWN"; - - pr_debug("hvsi%i: state = %s\n", hp->index, name); -#endif /* DEBUG */ -} - -static inline void __set_state(struct hvsi_struct *hp, int state) -{ - hp->state = state; - print_state(hp); - wake_up_all(&hp->stateq); -} - -static inline void set_state(struct hvsi_struct *hp, int state) -{ - unsigned long flags; - - spin_lock_irqsave(&hp->lock, flags); - __set_state(hp, state); - spin_unlock_irqrestore(&hp->lock, flags); -} - -static inline int len_packet(const uint8_t *packet) -{ - return (int)((struct hvsi_header *)packet)->len; -} - -static inline int is_header(const uint8_t *packet) -{ - struct hvsi_header *header = (struct hvsi_header *)packet; - return header->type >= VS_QUERY_RESPONSE_PACKET_HEADER; -} - -static inline int got_packet(const struct hvsi_struct *hp, uint8_t *packet) -{ - if (hp->inbuf_end < packet + sizeof(struct hvsi_header)) - return 0; /* don't even have the packet header */ - - if (hp->inbuf_end < (packet + len_packet(packet))) - return 0; /* don't have the rest of the packet */ - - return 1; -} - -/* shift remaining bytes in packetbuf down */ -static void compact_inbuf(struct hvsi_struct *hp, uint8_t *read_to) -{ - int remaining = (int)(hp->inbuf_end - read_to); - - pr_debug("%s: %i chars remain\n", __func__, remaining); - - if (read_to != hp->inbuf) - memmove(hp->inbuf, read_to, remaining); - - hp->inbuf_end = hp->inbuf + remaining; -} - -#ifdef DEBUG -#define dbg_dump_packet(packet) dump_packet(packet) -#define dbg_dump_hex(data, len) dump_hex(data, len) -#else -#define dbg_dump_packet(packet) do { } while (0) -#define dbg_dump_hex(data, len) do { } while (0) -#endif - -static void dump_hex(const uint8_t *data, int len) -{ - int i; - - printk(" "); - for (i=0; i < len; i++) - printk("%.2x", data[i]); - - printk("\n "); - for (i=0; i < len; i++) { - if (isprint(data[i])) - printk("%c", data[i]); - else - printk("."); - } - printk("\n"); -} - -static void dump_packet(uint8_t *packet) -{ - struct hvsi_header *header = (struct hvsi_header *)packet; - - printk("type 0x%x, len %i, seqno %i:\n", header->type, header->len, - header->seqno); - - dump_hex(packet, header->len); -} - -static int hvsi_read(struct hvsi_struct *hp, char *buf, int count) -{ - unsigned long got; - - got = hvc_get_chars(hp->vtermno, buf, count); - - return got; -} - -static void hvsi_recv_control(struct hvsi_struct *hp, uint8_t *packet, - struct tty_struct **to_hangup, struct hvsi_struct **to_handshake) -{ - struct hvsi_control *header = (struct hvsi_control *)packet; - - switch (header->verb) { - case VSV_MODEM_CTL_UPDATE: - if ((header->word & HVSI_TSCD) == 0) { - /* CD went away; no more connection */ - pr_debug("hvsi%i: CD dropped\n", hp->index); - hp->mctrl &= TIOCM_CD; - /* If userland hasn't done an open(2) yet, hp->tty is NULL. */ - if (hp->tty && !(hp->tty->flags & CLOCAL)) - *to_hangup = hp->tty; - } - break; - case VSV_CLOSE_PROTOCOL: - pr_debug("hvsi%i: service processor came back\n", hp->index); - if (hp->state != HVSI_CLOSED) { - *to_handshake = hp; - } - break; - default: - printk(KERN_WARNING "hvsi%i: unknown HVSI control packet: ", - hp->index); - dump_packet(packet); - break; - } -} - -static void hvsi_recv_response(struct hvsi_struct *hp, uint8_t *packet) -{ - struct hvsi_query_response *resp = (struct hvsi_query_response *)packet; - - switch (hp->state) { - case HVSI_WAIT_FOR_VER_RESPONSE: - __set_state(hp, HVSI_WAIT_FOR_VER_QUERY); - break; - case HVSI_WAIT_FOR_MCTRL_RESPONSE: - hp->mctrl = 0; - if (resp->u.mctrl_word & HVSI_TSDTR) - hp->mctrl |= TIOCM_DTR; - if (resp->u.mctrl_word & HVSI_TSCD) - hp->mctrl |= TIOCM_CD; - __set_state(hp, HVSI_OPEN); - break; - default: - printk(KERN_ERR "hvsi%i: unexpected query response: ", hp->index); - dump_packet(packet); - break; - } -} - -/* respond to service processor's version query */ -static int hvsi_version_respond(struct hvsi_struct *hp, uint16_t query_seqno) -{ - struct hvsi_query_response packet __ALIGNED__; - int wrote; - - packet.type = VS_QUERY_RESPONSE_PACKET_HEADER; - packet.len = sizeof(struct hvsi_query_response); - packet.seqno = atomic_inc_return(&hp->seqno); - packet.verb = VSV_SEND_VERSION_NUMBER; - packet.u.version = HVSI_VERSION; - packet.query_seqno = query_seqno+1; - - pr_debug("%s: sending %i bytes\n", __func__, packet.len); - dbg_dump_hex((uint8_t*)&packet, packet.len); - - wrote = hvc_put_chars(hp->vtermno, (char *)&packet, packet.len); - if (wrote != packet.len) { - printk(KERN_ERR "hvsi%i: couldn't send query response!\n", - hp->index); - return -EIO; - } - - return 0; -} - -static void hvsi_recv_query(struct hvsi_struct *hp, uint8_t *packet) -{ - struct hvsi_query *query = (struct hvsi_query *)packet; - - switch (hp->state) { - case HVSI_WAIT_FOR_VER_QUERY: - hvsi_version_respond(hp, query->seqno); - __set_state(hp, HVSI_OPEN); - break; - default: - printk(KERN_ERR "hvsi%i: unexpected query: ", hp->index); - dump_packet(packet); - break; - } -} - -static void hvsi_insert_chars(struct hvsi_struct *hp, const char *buf, int len) -{ - int i; - - for (i=0; i < len; i++) { - char c = buf[i]; -#ifdef CONFIG_MAGIC_SYSRQ - if (c == '\0') { - hp->sysrq = 1; - continue; - } else if (hp->sysrq) { - handle_sysrq(c); - hp->sysrq = 0; - continue; - } -#endif /* CONFIG_MAGIC_SYSRQ */ - tty_insert_flip_char(hp->tty, c, 0); - } -} - -/* - * We could get 252 bytes of data at once here. But the tty layer only - * throttles us at TTY_THRESHOLD_THROTTLE (128) bytes, so we could overflow - * it. Accordingly we won't send more than 128 bytes at a time to the flip - * buffer, which will give the tty buffer a chance to throttle us. Should the - * value of TTY_THRESHOLD_THROTTLE change in n_tty.c, this code should be - * revisited. - */ -#define TTY_THRESHOLD_THROTTLE 128 -static struct tty_struct *hvsi_recv_data(struct hvsi_struct *hp, - const uint8_t *packet) -{ - const struct hvsi_header *header = (const struct hvsi_header *)packet; - const uint8_t *data = packet + sizeof(struct hvsi_header); - int datalen = header->len - sizeof(struct hvsi_header); - int overflow = datalen - TTY_THRESHOLD_THROTTLE; - - pr_debug("queueing %i chars '%.*s'\n", datalen, datalen, data); - - if (datalen == 0) - return NULL; - - if (overflow > 0) { - pr_debug("%s: got >TTY_THRESHOLD_THROTTLE bytes\n", __func__); - datalen = TTY_THRESHOLD_THROTTLE; - } - - hvsi_insert_chars(hp, data, datalen); - - if (overflow > 0) { - /* - * we still have more data to deliver, so we need to save off the - * overflow and send it later - */ - pr_debug("%s: deferring overflow\n", __func__); - memcpy(hp->throttle_buf, data + TTY_THRESHOLD_THROTTLE, overflow); - hp->n_throttle = overflow; - } - - return hp->tty; -} - -/* - * Returns true/false indicating data successfully read from hypervisor. - * Used both to get packets for tty connections and to advance the state - * machine during console handshaking (in which case tty = NULL and we ignore - * incoming data). - */ -static int hvsi_load_chunk(struct hvsi_struct *hp, struct tty_struct **flip, - struct tty_struct **hangup, struct hvsi_struct **handshake) -{ - uint8_t *packet = hp->inbuf; - int chunklen; - - *flip = NULL; - *hangup = NULL; - *handshake = NULL; - - chunklen = hvsi_read(hp, hp->inbuf_end, HVSI_MAX_READ); - if (chunklen == 0) { - pr_debug("%s: 0-length read\n", __func__); - return 0; - } - - pr_debug("%s: got %i bytes\n", __func__, chunklen); - dbg_dump_hex(hp->inbuf_end, chunklen); - - hp->inbuf_end += chunklen; - - /* handle all completed packets */ - while ((packet < hp->inbuf_end) && got_packet(hp, packet)) { - struct hvsi_header *header = (struct hvsi_header *)packet; - - if (!is_header(packet)) { - printk(KERN_ERR "hvsi%i: got malformed packet\n", hp->index); - /* skip bytes until we find a header or run out of data */ - while ((packet < hp->inbuf_end) && (!is_header(packet))) - packet++; - continue; - } - - pr_debug("%s: handling %i-byte packet\n", __func__, - len_packet(packet)); - dbg_dump_packet(packet); - - switch (header->type) { - case VS_DATA_PACKET_HEADER: - if (!is_open(hp)) - break; - if (hp->tty == NULL) - break; /* no tty buffer to put data in */ - *flip = hvsi_recv_data(hp, packet); - break; - case VS_CONTROL_PACKET_HEADER: - hvsi_recv_control(hp, packet, hangup, handshake); - break; - case VS_QUERY_RESPONSE_PACKET_HEADER: - hvsi_recv_response(hp, packet); - break; - case VS_QUERY_PACKET_HEADER: - hvsi_recv_query(hp, packet); - break; - default: - printk(KERN_ERR "hvsi%i: unknown HVSI packet type 0x%x\n", - hp->index, header->type); - dump_packet(packet); - break; - } - - packet += len_packet(packet); - - if (*hangup || *handshake) { - pr_debug("%s: hangup or handshake\n", __func__); - /* - * we need to send the hangup now before receiving any more data. - * If we get "data, hangup, data", we can't deliver the second - * data before the hangup. - */ - break; - } - } - - compact_inbuf(hp, packet); - - return 1; -} - -static void hvsi_send_overflow(struct hvsi_struct *hp) -{ - pr_debug("%s: delivering %i bytes overflow\n", __func__, - hp->n_throttle); - - hvsi_insert_chars(hp, hp->throttle_buf, hp->n_throttle); - hp->n_throttle = 0; -} - -/* - * must get all pending data because we only get an irq on empty->non-empty - * transition - */ -static irqreturn_t hvsi_interrupt(int irq, void *arg) -{ - struct hvsi_struct *hp = (struct hvsi_struct *)arg; - struct tty_struct *flip; - struct tty_struct *hangup; - struct hvsi_struct *handshake; - unsigned long flags; - int again = 1; - - pr_debug("%s\n", __func__); - - while (again) { - spin_lock_irqsave(&hp->lock, flags); - again = hvsi_load_chunk(hp, &flip, &hangup, &handshake); - spin_unlock_irqrestore(&hp->lock, flags); - - /* - * we have to call tty_flip_buffer_push() and tty_hangup() outside our - * spinlock. But we also have to keep going until we've read all the - * available data. - */ - - if (flip) { - /* there was data put in the tty flip buffer */ - tty_flip_buffer_push(flip); - flip = NULL; - } - - if (hangup) { - tty_hangup(hangup); - } - - if (handshake) { - pr_debug("hvsi%i: attempting re-handshake\n", handshake->index); - schedule_work(&handshake->handshaker); - } - } - - spin_lock_irqsave(&hp->lock, flags); - if (hp->tty && hp->n_throttle - && (!test_bit(TTY_THROTTLED, &hp->tty->flags))) { - /* we weren't hung up and we weren't throttled, so we can deliver the - * rest now */ - flip = hp->tty; - hvsi_send_overflow(hp); - } - spin_unlock_irqrestore(&hp->lock, flags); - - if (flip) { - tty_flip_buffer_push(flip); - } - - return IRQ_HANDLED; -} - -/* for boot console, before the irq handler is running */ -static int __init poll_for_state(struct hvsi_struct *hp, int state) -{ - unsigned long end_jiffies = jiffies + HVSI_TIMEOUT; - - for (;;) { - hvsi_interrupt(hp->virq, (void *)hp); /* get pending data */ - - if (hp->state == state) - return 0; - - mdelay(5); - if (time_after(jiffies, end_jiffies)) - return -EIO; - } -} - -/* wait for irq handler to change our state */ -static int wait_for_state(struct hvsi_struct *hp, int state) -{ - int ret = 0; - - if (!wait_event_timeout(hp->stateq, (hp->state == state), HVSI_TIMEOUT)) - ret = -EIO; - - return ret; -} - -static int hvsi_query(struct hvsi_struct *hp, uint16_t verb) -{ - struct hvsi_query packet __ALIGNED__; - int wrote; - - packet.type = VS_QUERY_PACKET_HEADER; - packet.len = sizeof(struct hvsi_query); - packet.seqno = atomic_inc_return(&hp->seqno); - packet.verb = verb; - - pr_debug("%s: sending %i bytes\n", __func__, packet.len); - dbg_dump_hex((uint8_t*)&packet, packet.len); - - wrote = hvc_put_chars(hp->vtermno, (char *)&packet, packet.len); - if (wrote != packet.len) { - printk(KERN_ERR "hvsi%i: couldn't send query (%i)!\n", hp->index, - wrote); - return -EIO; - } - - return 0; -} - -static int hvsi_get_mctrl(struct hvsi_struct *hp) -{ - int ret; - - set_state(hp, HVSI_WAIT_FOR_MCTRL_RESPONSE); - hvsi_query(hp, VSV_SEND_MODEM_CTL_STATUS); - - ret = hvsi_wait(hp, HVSI_OPEN); - if (ret < 0) { - printk(KERN_ERR "hvsi%i: didn't get modem flags\n", hp->index); - set_state(hp, HVSI_OPEN); - return ret; - } - - pr_debug("%s: mctrl 0x%x\n", __func__, hp->mctrl); - - return 0; -} - -/* note that we can only set DTR */ -static int hvsi_set_mctrl(struct hvsi_struct *hp, uint16_t mctrl) -{ - struct hvsi_control packet __ALIGNED__; - int wrote; - - packet.type = VS_CONTROL_PACKET_HEADER, - packet.seqno = atomic_inc_return(&hp->seqno); - packet.len = sizeof(struct hvsi_control); - packet.verb = VSV_SET_MODEM_CTL; - packet.mask = HVSI_TSDTR; - - if (mctrl & TIOCM_DTR) - packet.word = HVSI_TSDTR; - - pr_debug("%s: sending %i bytes\n", __func__, packet.len); - dbg_dump_hex((uint8_t*)&packet, packet.len); - - wrote = hvc_put_chars(hp->vtermno, (char *)&packet, packet.len); - if (wrote != packet.len) { - printk(KERN_ERR "hvsi%i: couldn't set DTR!\n", hp->index); - return -EIO; - } - - return 0; -} - -static void hvsi_drain_input(struct hvsi_struct *hp) -{ - uint8_t buf[HVSI_MAX_READ] __ALIGNED__; - unsigned long end_jiffies = jiffies + HVSI_TIMEOUT; - - while (time_before(end_jiffies, jiffies)) - if (0 == hvsi_read(hp, buf, HVSI_MAX_READ)) - break; -} - -static int hvsi_handshake(struct hvsi_struct *hp) -{ - int ret; - - /* - * We could have a CLOSE or other data waiting for us before we even try - * to open; try to throw it all away so we don't get confused. (CLOSE - * is the first message sent up the pipe when the FSP comes online. We - * need to distinguish between "it came up a while ago and we're the first - * user" and "it was just reset before it saw our handshake packet".) - */ - hvsi_drain_input(hp); - - set_state(hp, HVSI_WAIT_FOR_VER_RESPONSE); - ret = hvsi_query(hp, VSV_SEND_VERSION_NUMBER); - if (ret < 0) { - printk(KERN_ERR "hvsi%i: couldn't send version query\n", hp->index); - return ret; - } - - ret = hvsi_wait(hp, HVSI_OPEN); - if (ret < 0) - return ret; - - return 0; -} - -static void hvsi_handshaker(struct work_struct *work) -{ - struct hvsi_struct *hp = - container_of(work, struct hvsi_struct, handshaker); - - if (hvsi_handshake(hp) >= 0) - return; - - printk(KERN_ERR "hvsi%i: re-handshaking failed\n", hp->index); - if (is_console(hp)) { - /* - * ttys will re-attempt the handshake via hvsi_open, but - * the console will not. - */ - printk(KERN_ERR "hvsi%i: lost console!\n", hp->index); - } -} - -static int hvsi_put_chars(struct hvsi_struct *hp, const char *buf, int count) -{ - struct hvsi_data packet __ALIGNED__; - int ret; - - BUG_ON(count > HVSI_MAX_OUTGOING_DATA); - - packet.type = VS_DATA_PACKET_HEADER; - packet.seqno = atomic_inc_return(&hp->seqno); - packet.len = count + sizeof(struct hvsi_header); - memcpy(&packet.data, buf, count); - - ret = hvc_put_chars(hp->vtermno, (char *)&packet, packet.len); - if (ret == packet.len) { - /* return the number of chars written, not the packet length */ - return count; - } - return ret; /* return any errors */ -} - -static void hvsi_close_protocol(struct hvsi_struct *hp) -{ - struct hvsi_control packet __ALIGNED__; - - packet.type = VS_CONTROL_PACKET_HEADER; - packet.seqno = atomic_inc_return(&hp->seqno); - packet.len = 6; - packet.verb = VSV_CLOSE_PROTOCOL; - - pr_debug("%s: sending %i bytes\n", __func__, packet.len); - dbg_dump_hex((uint8_t*)&packet, packet.len); - - hvc_put_chars(hp->vtermno, (char *)&packet, packet.len); -} - -static int hvsi_open(struct tty_struct *tty, struct file *filp) -{ - struct hvsi_struct *hp; - unsigned long flags; - int line = tty->index; - int ret; - - pr_debug("%s\n", __func__); - - if (line < 0 || line >= hvsi_count) - return -ENODEV; - hp = &hvsi_ports[line]; - - tty->driver_data = hp; - - mb(); - if (hp->state == HVSI_FSP_DIED) - return -EIO; - - spin_lock_irqsave(&hp->lock, flags); - hp->tty = tty; - hp->count++; - atomic_set(&hp->seqno, 0); - h_vio_signal(hp->vtermno, VIO_IRQ_ENABLE); - spin_unlock_irqrestore(&hp->lock, flags); - - if (is_console(hp)) - return 0; /* this has already been handshaked as the console */ - - ret = hvsi_handshake(hp); - if (ret < 0) { - printk(KERN_ERR "%s: HVSI handshaking failed\n", tty->name); - return ret; - } - - ret = hvsi_get_mctrl(hp); - if (ret < 0) { - printk(KERN_ERR "%s: couldn't get initial modem flags\n", tty->name); - return ret; - } - - ret = hvsi_set_mctrl(hp, hp->mctrl | TIOCM_DTR); - if (ret < 0) { - printk(KERN_ERR "%s: couldn't set DTR\n", tty->name); - return ret; - } - - return 0; -} - -/* wait for hvsi_write_worker to empty hp->outbuf */ -static void hvsi_flush_output(struct hvsi_struct *hp) -{ - wait_event_timeout(hp->emptyq, (hp->n_outbuf <= 0), HVSI_TIMEOUT); - - /* 'writer' could still be pending if it didn't see n_outbuf = 0 yet */ - cancel_delayed_work_sync(&hp->writer); - flush_work_sync(&hp->handshaker); - - /* - * it's also possible that our timeout expired and hvsi_write_worker - * didn't manage to push outbuf. poof. - */ - hp->n_outbuf = 0; -} - -static void hvsi_close(struct tty_struct *tty, struct file *filp) -{ - struct hvsi_struct *hp = tty->driver_data; - unsigned long flags; - - pr_debug("%s\n", __func__); - - if (tty_hung_up_p(filp)) - return; - - spin_lock_irqsave(&hp->lock, flags); - - if (--hp->count == 0) { - hp->tty = NULL; - hp->inbuf_end = hp->inbuf; /* discard remaining partial packets */ - - /* only close down connection if it is not the console */ - if (!is_console(hp)) { - h_vio_signal(hp->vtermno, VIO_IRQ_DISABLE); /* no more irqs */ - __set_state(hp, HVSI_CLOSED); - /* - * any data delivered to the tty layer after this will be - * discarded (except for XON/XOFF) - */ - tty->closing = 1; - - spin_unlock_irqrestore(&hp->lock, flags); - - /* let any existing irq handlers finish. no more will start. */ - synchronize_irq(hp->virq); - - /* hvsi_write_worker will re-schedule until outbuf is empty. */ - hvsi_flush_output(hp); - - /* tell FSP to stop sending data */ - hvsi_close_protocol(hp); - - /* - * drain anything FSP is still in the middle of sending, and let - * hvsi_handshake drain the rest on the next open. - */ - hvsi_drain_input(hp); - - spin_lock_irqsave(&hp->lock, flags); - } - } else if (hp->count < 0) - printk(KERN_ERR "hvsi_close %lu: oops, count is %d\n", - hp - hvsi_ports, hp->count); - - spin_unlock_irqrestore(&hp->lock, flags); -} - -static void hvsi_hangup(struct tty_struct *tty) -{ - struct hvsi_struct *hp = tty->driver_data; - unsigned long flags; - - pr_debug("%s\n", __func__); - - spin_lock_irqsave(&hp->lock, flags); - - hp->count = 0; - hp->n_outbuf = 0; - hp->tty = NULL; - - spin_unlock_irqrestore(&hp->lock, flags); -} - -/* called with hp->lock held */ -static void hvsi_push(struct hvsi_struct *hp) -{ - int n; - - if (hp->n_outbuf <= 0) - return; - - n = hvsi_put_chars(hp, hp->outbuf, hp->n_outbuf); - if (n > 0) { - /* success */ - pr_debug("%s: wrote %i chars\n", __func__, n); - hp->n_outbuf = 0; - } else if (n == -EIO) { - __set_state(hp, HVSI_FSP_DIED); - printk(KERN_ERR "hvsi%i: service processor died\n", hp->index); - } -} - -/* hvsi_write_worker will keep rescheduling itself until outbuf is empty */ -static void hvsi_write_worker(struct work_struct *work) -{ - struct hvsi_struct *hp = - container_of(work, struct hvsi_struct, writer.work); - unsigned long flags; -#ifdef DEBUG - static long start_j = 0; - - if (start_j == 0) - start_j = jiffies; -#endif /* DEBUG */ - - spin_lock_irqsave(&hp->lock, flags); - - pr_debug("%s: %i chars in buffer\n", __func__, hp->n_outbuf); - - if (!is_open(hp)) { - /* - * We could have a non-open connection if the service processor died - * while we were busily scheduling ourselves. In that case, it could - * be minutes before the service processor comes back, so only try - * again once a second. - */ - schedule_delayed_work(&hp->writer, HZ); - goto out; - } - - hvsi_push(hp); - if (hp->n_outbuf > 0) - schedule_delayed_work(&hp->writer, 10); - else { -#ifdef DEBUG - pr_debug("%s: outbuf emptied after %li jiffies\n", __func__, - jiffies - start_j); - start_j = 0; -#endif /* DEBUG */ - wake_up_all(&hp->emptyq); - tty_wakeup(hp->tty); - } - -out: - spin_unlock_irqrestore(&hp->lock, flags); -} - -static int hvsi_write_room(struct tty_struct *tty) -{ - struct hvsi_struct *hp = tty->driver_data; - - return N_OUTBUF - hp->n_outbuf; -} - -static int hvsi_chars_in_buffer(struct tty_struct *tty) -{ - struct hvsi_struct *hp = tty->driver_data; - - return hp->n_outbuf; -} - -static int hvsi_write(struct tty_struct *tty, - const unsigned char *buf, int count) -{ - struct hvsi_struct *hp = tty->driver_data; - const char *source = buf; - unsigned long flags; - int total = 0; - int origcount = count; - - spin_lock_irqsave(&hp->lock, flags); - - pr_debug("%s: %i chars in buffer\n", __func__, hp->n_outbuf); - - if (!is_open(hp)) { - /* we're either closing or not yet open; don't accept data */ - pr_debug("%s: not open\n", __func__); - goto out; - } - - /* - * when the hypervisor buffer (16K) fills, data will stay in hp->outbuf - * and hvsi_write_worker will be scheduled. subsequent hvsi_write() calls - * will see there is no room in outbuf and return. - */ - while ((count > 0) && (hvsi_write_room(hp->tty) > 0)) { - int chunksize = min(count, hvsi_write_room(hp->tty)); - - BUG_ON(hp->n_outbuf < 0); - memcpy(hp->outbuf + hp->n_outbuf, source, chunksize); - hp->n_outbuf += chunksize; - - total += chunksize; - source += chunksize; - count -= chunksize; - hvsi_push(hp); - } - - if (hp->n_outbuf > 0) { - /* - * we weren't able to write it all to the hypervisor. - * schedule another push attempt. - */ - schedule_delayed_work(&hp->writer, 10); - } - -out: - spin_unlock_irqrestore(&hp->lock, flags); - - if (total != origcount) - pr_debug("%s: wanted %i, only wrote %i\n", __func__, origcount, - total); - - return total; -} - -/* - * I have never seen throttle or unthrottle called, so this little throttle - * buffering scheme may or may not work. - */ -static void hvsi_throttle(struct tty_struct *tty) -{ - struct hvsi_struct *hp = tty->driver_data; - - pr_debug("%s\n", __func__); - - h_vio_signal(hp->vtermno, VIO_IRQ_DISABLE); -} - -static void hvsi_unthrottle(struct tty_struct *tty) -{ - struct hvsi_struct *hp = tty->driver_data; - unsigned long flags; - int shouldflip = 0; - - pr_debug("%s\n", __func__); - - spin_lock_irqsave(&hp->lock, flags); - if (hp->n_throttle) { - hvsi_send_overflow(hp); - shouldflip = 1; - } - spin_unlock_irqrestore(&hp->lock, flags); - - if (shouldflip) - tty_flip_buffer_push(hp->tty); - - h_vio_signal(hp->vtermno, VIO_IRQ_ENABLE); -} - -static int hvsi_tiocmget(struct tty_struct *tty, struct file *file) -{ - struct hvsi_struct *hp = tty->driver_data; - - hvsi_get_mctrl(hp); - return hp->mctrl; -} - -static int hvsi_tiocmset(struct tty_struct *tty, struct file *file, - unsigned int set, unsigned int clear) -{ - struct hvsi_struct *hp = tty->driver_data; - unsigned long flags; - uint16_t new_mctrl; - - /* we can only alter DTR */ - clear &= TIOCM_DTR; - set &= TIOCM_DTR; - - spin_lock_irqsave(&hp->lock, flags); - - new_mctrl = (hp->mctrl & ~clear) | set; - - if (hp->mctrl != new_mctrl) { - hvsi_set_mctrl(hp, new_mctrl); - hp->mctrl = new_mctrl; - } - spin_unlock_irqrestore(&hp->lock, flags); - - return 0; -} - - -static const struct tty_operations hvsi_ops = { - .open = hvsi_open, - .close = hvsi_close, - .write = hvsi_write, - .hangup = hvsi_hangup, - .write_room = hvsi_write_room, - .chars_in_buffer = hvsi_chars_in_buffer, - .throttle = hvsi_throttle, - .unthrottle = hvsi_unthrottle, - .tiocmget = hvsi_tiocmget, - .tiocmset = hvsi_tiocmset, -}; - -static int __init hvsi_init(void) -{ - int i; - - hvsi_driver = alloc_tty_driver(hvsi_count); - if (!hvsi_driver) - return -ENOMEM; - - hvsi_driver->owner = THIS_MODULE; - hvsi_driver->driver_name = "hvsi"; - hvsi_driver->name = "hvsi"; - hvsi_driver->major = HVSI_MAJOR; - hvsi_driver->minor_start = HVSI_MINOR; - hvsi_driver->type = TTY_DRIVER_TYPE_SYSTEM; - hvsi_driver->init_termios = tty_std_termios; - hvsi_driver->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL; - hvsi_driver->init_termios.c_ispeed = 9600; - hvsi_driver->init_termios.c_ospeed = 9600; - hvsi_driver->flags = TTY_DRIVER_REAL_RAW; - tty_set_operations(hvsi_driver, &hvsi_ops); - - for (i=0; i < hvsi_count; i++) { - struct hvsi_struct *hp = &hvsi_ports[i]; - int ret = 1; - - ret = request_irq(hp->virq, hvsi_interrupt, IRQF_DISABLED, "hvsi", hp); - if (ret) - printk(KERN_ERR "HVSI: couldn't reserve irq 0x%x (error %i)\n", - hp->virq, ret); - } - hvsi_wait = wait_for_state; /* irqs active now */ - - if (tty_register_driver(hvsi_driver)) - panic("Couldn't register hvsi console driver\n"); - - printk(KERN_DEBUG "HVSI: registered %i devices\n", hvsi_count); - - return 0; -} -device_initcall(hvsi_init); - -/***** console (not tty) code: *****/ - -static void hvsi_console_print(struct console *console, const char *buf, - unsigned int count) -{ - struct hvsi_struct *hp = &hvsi_ports[console->index]; - char c[HVSI_MAX_OUTGOING_DATA] __ALIGNED__; - unsigned int i = 0, n = 0; - int ret, donecr = 0; - - mb(); - if (!is_open(hp)) - return; - - /* - * ugh, we have to translate LF -> CRLF ourselves, in place. - * copied from hvc_console.c: - */ - while (count > 0 || i > 0) { - if (count > 0 && i < sizeof(c)) { - if (buf[n] == '\n' && !donecr) { - c[i++] = '\r'; - donecr = 1; - } else { - c[i++] = buf[n++]; - donecr = 0; - --count; - } - } else { - ret = hvsi_put_chars(hp, c, i); - if (ret < 0) - i = 0; - i -= ret; - } - } -} - -static struct tty_driver *hvsi_console_device(struct console *console, - int *index) -{ - *index = console->index; - return hvsi_driver; -} - -static int __init hvsi_console_setup(struct console *console, char *options) -{ - struct hvsi_struct *hp; - int ret; - - if (console->index < 0 || console->index >= hvsi_count) - return -1; - hp = &hvsi_ports[console->index]; - - /* give the FSP a chance to change the baud rate when we re-open */ - hvsi_close_protocol(hp); - - ret = hvsi_handshake(hp); - if (ret < 0) - return ret; - - ret = hvsi_get_mctrl(hp); - if (ret < 0) - return ret; - - ret = hvsi_set_mctrl(hp, hp->mctrl | TIOCM_DTR); - if (ret < 0) - return ret; - - hp->flags |= HVSI_CONSOLE; - - return 0; -} - -static struct console hvsi_console = { - .name = "hvsi", - .write = hvsi_console_print, - .device = hvsi_console_device, - .setup = hvsi_console_setup, - .flags = CON_PRINTBUFFER, - .index = -1, -}; - -static int __init hvsi_console_init(void) -{ - struct device_node *vty; - - hvsi_wait = poll_for_state; /* no irqs yet; must poll */ - - /* search device tree for vty nodes */ - for (vty = of_find_compatible_node(NULL, "serial", "hvterm-protocol"); - vty != NULL; - vty = of_find_compatible_node(vty, "serial", "hvterm-protocol")) { - struct hvsi_struct *hp; - const uint32_t *vtermno, *irq; - - vtermno = of_get_property(vty, "reg", NULL); - irq = of_get_property(vty, "interrupts", NULL); - if (!vtermno || !irq) - continue; - - if (hvsi_count >= MAX_NR_HVSI_CONSOLES) { - of_node_put(vty); - break; - } - - hp = &hvsi_ports[hvsi_count]; - INIT_DELAYED_WORK(&hp->writer, hvsi_write_worker); - INIT_WORK(&hp->handshaker, hvsi_handshaker); - init_waitqueue_head(&hp->emptyq); - init_waitqueue_head(&hp->stateq); - spin_lock_init(&hp->lock); - hp->index = hvsi_count; - hp->inbuf_end = hp->inbuf; - hp->state = HVSI_CLOSED; - hp->vtermno = *vtermno; - hp->virq = irq_create_mapping(NULL, irq[0]); - if (hp->virq == NO_IRQ) { - printk(KERN_ERR "%s: couldn't create irq mapping for 0x%x\n", - __func__, irq[0]); - continue; - } - - hvsi_count++; - } - - if (hvsi_count) - register_console(&hvsi_console); - return 0; -} -console_initcall(hvsi_console_init); diff --git a/drivers/char/virtio_console.c b/drivers/char/virtio_console.c deleted file mode 100644 index 896a2ced1d2..00000000000 --- a/drivers/char/virtio_console.c +++ /dev/null @@ -1,1838 +0,0 @@ -/* - * Copyright (C) 2006, 2007, 2009 Rusty Russell, IBM Corporation - * Copyright (C) 2009, 2010 Red Hat, Inc. - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2 of the License, or - * (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA - */ -#include <linux/cdev.h> -#include <linux/debugfs.h> -#include <linux/device.h> -#include <linux/err.h> -#include <linux/fs.h> -#include <linux/init.h> -#include <linux/list.h> -#include <linux/poll.h> -#include <linux/sched.h> -#include <linux/slab.h> -#include <linux/spinlock.h> -#include <linux/virtio.h> -#include <linux/virtio_console.h> -#include <linux/wait.h> -#include <linux/workqueue.h> -#include "hvc_console.h" - -/* - * This is a global struct for storing common data for all the devices - * this driver handles. - * - * Mainly, it has a linked list for all the consoles in one place so - * that callbacks from hvc for get_chars(), put_chars() work properly - * across multiple devices and multiple ports per device. - */ -struct ports_driver_data { - /* Used for registering chardevs */ - struct class *class; - - /* Used for exporting per-port information to debugfs */ - struct dentry *debugfs_dir; - - /* List of all the devices we're handling */ - struct list_head portdevs; - - /* Number of devices this driver is handling */ - unsigned int index; - - /* - * This is used to keep track of the number of hvc consoles - * spawned by this driver. This number is given as the first - * argument to hvc_alloc(). To correctly map an initial - * console spawned via hvc_instantiate to the console being - * hooked up via hvc_alloc, we need to pass the same vtermno. - * - * We also just assume the first console being initialised was - * the first one that got used as the initial console. - */ - unsigned int next_vtermno; - - /* All the console devices handled by this driver */ - struct list_head consoles; -}; -static struct ports_driver_data pdrvdata; - -DEFINE_SPINLOCK(pdrvdata_lock); - -/* This struct holds information that's relevant only for console ports */ -struct console { - /* We'll place all consoles in a list in the pdrvdata struct */ - struct list_head list; - - /* The hvc device associated with this console port */ - struct hvc_struct *hvc; - - /* The size of the console */ - struct winsize ws; - - /* - * This number identifies the number that we used to register - * with hvc in hvc_instantiate() and hvc_alloc(); this is the - * number passed on by the hvc callbacks to us to - * differentiate between the other console ports handled by - * this driver - */ - u32 vtermno; -}; - -struct port_buffer { - char *buf; - - /* size of the buffer in *buf above */ - size_t size; - - /* used length of the buffer */ - size_t len; - /* offset in the buf from which to consume data */ - size_t offset; -}; - -/* - * This is a per-device struct that stores data common to all the - * ports for that device (vdev->priv). - */ -struct ports_device { - /* Next portdev in the list, head is in the pdrvdata struct */ - struct list_head list; - - /* - * Workqueue handlers where we process deferred work after - * notification - */ - struct work_struct control_work; - - struct list_head ports; - - /* To protect the list of ports */ - spinlock_t ports_lock; - - /* To protect the vq operations for the control channel */ - spinlock_t cvq_lock; - - /* The current config space is stored here */ - struct virtio_console_config config; - - /* The virtio device we're associated with */ - struct virtio_device *vdev; - - /* - * A couple of virtqueues for the control channel: one for - * guest->host transfers, one for host->guest transfers - */ - struct virtqueue *c_ivq, *c_ovq; - - /* Array of per-port IO virtqueues */ - struct virtqueue **in_vqs, **out_vqs; - - /* Used for numbering devices for sysfs and debugfs */ - unsigned int drv_index; - - /* Major number for this device. Ports will be created as minors. */ - int chr_major; -}; - -/* This struct holds the per-port data */ -struct port { - /* Next port in the list, head is in the ports_device */ - struct list_head list; - - /* Pointer to the parent virtio_console device */ - struct ports_device *portdev; - - /* The current buffer from which data has to be fed to readers */ - struct port_buffer *inbuf; - - /* - * To protect the operations on the in_vq associated with this - * port. Has to be a spinlock because it can be called from - * interrupt context (get_char()). - */ - spinlock_t inbuf_lock; - - /* Protect the operations on the out_vq. */ - spinlock_t outvq_lock; - - /* The IO vqs for this port */ - struct virtqueue *in_vq, *out_vq; - - /* File in the debugfs directory that exposes this port's information */ - struct dentry *debugfs_file; - - /* - * The entries in this struct will be valid if this port is - * hooked up to an hvc console - */ - struct console cons; - - /* Each port associates with a separate char device */ - struct cdev *cdev; - struct device *dev; - - /* Reference-counting to handle port hot-unplugs and file operations */ - struct kref kref; - - /* A waitqueue for poll() or blocking read operations */ - wait_queue_head_t waitqueue; - - /* The 'name' of the port that we expose via sysfs properties */ - char *name; - - /* We can notify apps of host connect / disconnect events via SIGIO */ - struct fasync_struct *async_queue; - - /* The 'id' to identify the port with the Host */ - u32 id; - - bool outvq_full; - - /* Is the host device open */ - bool host_connected; - - /* We should allow only one process to open a port */ - bool guest_connected; -}; - -/* This is the very early arch-specified put chars function. */ -static int (*early_put_chars)(u32, const char *, int); - -static struct port *find_port_by_vtermno(u32 vtermno) -{ - struct port *port; - struct console *cons; - unsigned long flags; - - spin_lock_irqsave(&pdrvdata_lock, flags); - list_for_each_entry(cons, &pdrvdata.consoles, list) { - if (cons->vtermno == vtermno) { - port = container_of(cons, struct port, cons); - goto out; - } - } - port = NULL; -out: - spin_unlock_irqrestore(&pdrvdata_lock, flags); - return port; -} - -static struct port *find_port_by_devt_in_portdev(struct ports_device *portdev, - dev_t dev) -{ - struct port *port; - unsigned long flags; - - spin_lock_irqsave(&portdev->ports_lock, flags); - list_for_each_entry(port, &portdev->ports, list) - if (port->cdev->dev == dev) - goto out; - port = NULL; -out: - spin_unlock_irqrestore(&portdev->ports_lock, flags); - - return port; -} - -static struct port *find_port_by_devt(dev_t dev) -{ - struct ports_device *portdev; - struct port *port; - unsigned long flags; - - spin_lock_irqsave(&pdrvdata_lock, flags); - list_for_each_entry(portdev, &pdrvdata.portdevs, list) { - port = find_port_by_devt_in_portdev(portdev, dev); - if (port) - goto out; - } - port = NULL; -out: - spin_unlock_irqrestore(&pdrvdata_lock, flags); - return port; -} - -static struct port *find_port_by_id(struct ports_device *portdev, u32 id) -{ - struct port *port; - unsigned long flags; - - spin_lock_irqsave(&portdev->ports_lock, flags); - list_for_each_entry(port, &portdev->ports, list) - if (port->id == id) - goto out; - port = NULL; -out: - spin_unlock_irqrestore(&portdev->ports_lock, flags); - - return port; -} - -static struct port *find_port_by_vq(struct ports_device *portdev, - struct virtqueue *vq) -{ - struct port *port; - unsigned long flags; - - spin_lock_irqsave(&portdev->ports_lock, flags); - list_for_each_entry(port, &portdev->ports, list) - if (port->in_vq == vq || port->out_vq == vq) - goto out; - port = NULL; -out: - spin_unlock_irqrestore(&portdev->ports_lock, flags); - return port; -} - -static bool is_console_port(struct port *port) -{ - if (port->cons.hvc) - return true; - return false; -} - -static inline bool use_multiport(struct ports_device *portdev) -{ - /* - * This condition can be true when put_chars is called from - * early_init - */ - if (!portdev->vdev) - return 0; - return portdev->vdev->features[0] & (1 << VIRTIO_CONSOLE_F_MULTIPORT); -} - -static void free_buf(struct port_buffer *buf) -{ - kfree(buf->buf); - kfree(buf); -} - -static struct port_buffer *alloc_buf(size_t buf_size) -{ - struct port_buffer *buf; - - buf = kmalloc(sizeof(*buf), GFP_KERNEL); - if (!buf) - goto fail; - buf->buf = kzalloc(buf_size, GFP_KERNEL); - if (!buf->buf) - goto free_buf; - buf->len = 0; - buf->offset = 0; - buf->size = buf_size; - return buf; - -free_buf: - kfree(buf); -fail: - return NULL; -} - -/* Callers should take appropriate locks */ -static void *get_inbuf(struct port *port) -{ - struct port_buffer *buf; - struct virtqueue *vq; - unsigned int len; - - vq = port->in_vq; - buf = virtqueue_get_buf(vq, &len); - if (buf) { - buf->len = len; - buf->offset = 0; - } - return buf; -} - -/* - * Create a scatter-gather list representing our input buffer and put - * it in the queue. - * - * Callers should take appropriate locks. - */ -static int add_inbuf(struct virtqueue *vq, struct port_buffer *buf) -{ - struct scatterlist sg[1]; - int ret; - - sg_init_one(sg, buf->buf, buf->size); - - ret = virtqueue_add_buf(vq, sg, 0, 1, buf); - virtqueue_kick(vq); - return ret; -} - -/* Discard any unread data this port has. Callers lockers. */ -static void discard_port_data(struct port *port) -{ - struct port_buffer *buf; - struct virtqueue *vq; - unsigned int len; - int ret; - - vq = port->in_vq; - if (port->inbuf) - buf = port->inbuf; - else - buf = virtqueue_get_buf(vq, &len); - - ret = 0; - while (buf) { - if (add_inbuf(vq, buf) < 0) { - ret++; - free_buf(buf); - } - buf = virtqueue_get_buf(vq, &len); - } - port->inbuf = NULL; - if (ret) - dev_warn(port->dev, "Errors adding %d buffers back to vq\n", - ret); -} - -static bool port_has_data(struct port *port) -{ - unsigned long flags; - bool ret; - - spin_lock_irqsave(&port->inbuf_lock, flags); - if (port->inbuf) { - ret = true; - goto out; - } - port->inbuf = get_inbuf(port); - if (port->inbuf) { - ret = true; - goto out; - } - ret = false; -out: - spin_unlock_irqrestore(&port->inbuf_lock, flags); - return ret; -} - -static ssize_t __send_control_msg(struct ports_device *portdev, u32 port_id, - unsigned int event, unsigned int value) -{ - struct scatterlist sg[1]; - struct virtio_console_control cpkt; - struct virtqueue *vq; - unsigned int len; - - if (!use_multiport(portdev)) - return 0; - - cpkt.id = port_id; - cpkt.event = event; - cpkt.value = value; - - vq = portdev->c_ovq; - - sg_init_one(sg, &cpkt, sizeof(cpkt)); - if (virtqueue_add_buf(vq, sg, 1, 0, &cpkt) >= 0) { - virtqueue_kick(vq); - while (!virtqueue_get_buf(vq, &len)) - cpu_relax(); - } - return 0; -} - -static ssize_t send_control_msg(struct port *port, unsigned int event, - unsigned int value) -{ - /* Did the port get unplugged before userspace closed it? */ - if (port->portdev) - return __send_control_msg(port->portdev, port->id, event, value); - return 0; -} - -/* Callers must take the port->outvq_lock */ -static void reclaim_consumed_buffers(struct port *port) -{ - void *buf; - unsigned int len; - - while ((buf = virtqueue_get_buf(port->out_vq, &len))) { - kfree(buf); - port->outvq_full = false; - } -} - -static ssize_t send_buf(struct port *port, void *in_buf, size_t in_count, - bool nonblock) -{ - struct scatterlist sg[1]; - struct virtqueue *out_vq; - ssize_t ret; - unsigned long flags; - unsigned int len; - - out_vq = port->out_vq; - - spin_lock_irqsave(&port->outvq_lock, flags); - - reclaim_consumed_buffers(port); - - sg_init_one(sg, in_buf, in_count); - ret = virtqueue_add_buf(out_vq, sg, 1, 0, in_buf); - - /* Tell Host to go! */ - virtqueue_kick(out_vq); - - if (ret < 0) { - in_count = 0; - goto done; - } - - if (ret == 0) - port->outvq_full = true; - - if (nonblock) - goto done; - - /* - * Wait till the host acknowledges it pushed out the data we - * sent. This is done for data from the hvc_console; the tty - * operations are performed with spinlocks held so we can't - * sleep here. An alternative would be to copy the data to a - * buffer and relax the spinning requirement. The downside is - * we need to kmalloc a GFP_ATOMIC buffer each time the - * console driver writes something out. - */ - while (!virtqueue_get_buf(out_vq, &len)) - cpu_relax(); -done: - spin_unlock_irqrestore(&port->outvq_lock, flags); - /* - * We're expected to return the amount of data we wrote -- all - * of it - */ - return in_count; -} - -/* - * Give out the data that's requested from the buffer that we have - * queued up. - */ -static ssize_t fill_readbuf(struct port *port, char *out_buf, size_t out_count, - bool to_user) -{ - struct port_buffer *buf; - unsigned long flags; - - if (!out_count || !port_has_data(port)) - return 0; - - buf = port->inbuf; - out_count = min(out_count, buf->len - buf->offset); - - if (to_user) { - ssize_t ret; - - ret = copy_to_user(out_buf, buf->buf + buf->offset, out_count); - if (ret) - return -EFAULT; - } else { - memcpy(out_buf, buf->buf + buf->offset, out_count); - } - - buf->offset += out_count; - - if (buf->offset == buf->len) { - /* - * We're done using all the data in this buffer. - * Re-queue so that the Host can send us more data. - */ - spin_lock_irqsave(&port->inbuf_lock, flags); - port->inbuf = NULL; - - if (add_inbuf(port->in_vq, buf) < 0) - dev_warn(port->dev, "failed add_buf\n"); - - spin_unlock_irqrestore(&port->inbuf_lock, flags); - } - /* Return the number of bytes actually copied */ - return out_count; -} - -/* The condition that must be true for polling to end */ -static bool will_read_block(struct port *port) -{ - if (!port->guest_connected) { - /* Port got hot-unplugged. Let's exit. */ - return false; - } - return !port_has_data(port) && port->host_connected; -} - -static bool will_write_block(struct port *port) -{ - bool ret; - - if (!port->guest_connected) { - /* Port got hot-unplugged. Let's exit. */ - return false; - } - if (!port->host_connected) - return true; - - spin_lock_irq(&port->outvq_lock); - /* - * Check if the Host has consumed any buffers since we last - * sent data (this is only applicable for nonblocking ports). - */ - reclaim_consumed_buffers(port); - ret = port->outvq_full; - spin_unlock_irq(&port->outvq_lock); - - return ret; -} - -static ssize_t port_fops_read(struct file *filp, char __user *ubuf, - size_t count, loff_t *offp) -{ - struct port *port; - ssize_t ret; - - port = filp->private_data; - - if (!port_has_data(port)) { - /* - * If nothing's connected on the host just return 0 in - * case of list_empty; this tells the userspace app - * that there's no connection - */ - if (!port->host_connected) - return 0; - if (filp->f_flags & O_NONBLOCK) - return -EAGAIN; - - ret = wait_event_interruptible(port->waitqueue, - !will_read_block(port)); - if (ret < 0) - return ret; - } - /* Port got hot-unplugged. */ - if (!port->guest_connected) - return -ENODEV; - /* - * We could've received a disconnection message while we were - * waiting for more data. - * - * This check is not clubbed in the if() statement above as we - * might receive some data as well as the host could get - * disconnected after we got woken up from our wait. So we - * really want to give off whatever data we have and only then - * check for host_connected. - */ - if (!port_has_data(port) && !port->host_connected) - return 0; - - return fill_readbuf(port, ubuf, count, true); -} - -static ssize_t port_fops_write(struct file *filp, const char __user *ubuf, - size_t count, loff_t *offp) -{ - struct port *port; - char *buf; - ssize_t ret; - bool nonblock; - - /* Userspace could be out to fool us */ - if (!count) - return 0; - - port = filp->private_data; - - nonblock = filp->f_flags & O_NONBLOCK; - - if (will_write_block(port)) { - if (nonblock) - return -EAGAIN; - - ret = wait_event_interruptible(port->waitqueue, - !will_write_block(port)); - if (ret < 0) - return ret; - } - /* Port got hot-unplugged. */ - if (!port->guest_connected) - return -ENODEV; - - count = min((size_t)(32 * 1024), count); - - buf = kmalloc(count, GFP_KERNEL); - if (!buf) - return -ENOMEM; - - ret = copy_from_user(buf, ubuf, count); - if (ret) { - ret = -EFAULT; - goto free_buf; - } - - /* - * We now ask send_buf() to not spin for generic ports -- we - * can re-use the same code path that non-blocking file - * descriptors take for blocking file descriptors since the - * wait is already done and we're certain the write will go - * through to the host. - */ - nonblock = true; - ret = send_buf(port, buf, count, nonblock); - - if (nonblock && ret > 0) - goto out; - -free_buf: - kfree(buf); -out: - return ret; -} - -static unsigned int port_fops_poll(struct file *filp, poll_table *wait) -{ - struct port *port; - unsigned int ret; - - port = filp->private_data; - poll_wait(filp, &port->waitqueue, wait); - - if (!port->guest_connected) { - /* Port got unplugged */ - return POLLHUP; - } - ret = 0; - if (!will_read_block(port)) - ret |= POLLIN | POLLRDNORM; - if (!will_write_block(port)) - ret |= POLLOUT; - if (!port->host_connected) - ret |= POLLHUP; - - return ret; -} - -static void remove_port(struct kref *kref); - -static int port_fops_release(struct inode *inode, struct file *filp) -{ - struct port *port; - - port = filp->private_data; - - /* Notify host of port being closed */ - send_control_msg(port, VIRTIO_CONSOLE_PORT_OPEN, 0); - - spin_lock_irq(&port->inbuf_lock); - port->guest_connected = false; - - discard_port_data(port); - - spin_unlock_irq(&port->inbuf_lock); - - spin_lock_irq(&port->outvq_lock); - reclaim_consumed_buffers(port); - spin_unlock_irq(&port->outvq_lock); - - /* - * Locks aren't necessary here as a port can't be opened after - * unplug, and if a port isn't unplugged, a kref would already - * exist for the port. Plus, taking ports_lock here would - * create a dependency on other locks taken by functions - * inside remove_port if we're the last holder of the port, - * creating many problems. - */ - kref_put(&port->kref, remove_port); - - return 0; -} - -static int port_fops_open(struct inode *inode, struct file *filp) -{ - struct cdev *cdev = inode->i_cdev; - struct port *port; - int ret; - - port = find_port_by_devt(cdev->dev); - filp->private_data = port; - - /* Prevent against a port getting hot-unplugged at the same time */ - spin_lock_irq(&port->portdev->ports_lock); - kref_get(&port->kref); - spin_unlock_irq(&port->portdev->ports_lock); - - /* - * Don't allow opening of console port devices -- that's done - * via /dev/hvc - */ - if (is_console_port(port)) { - ret = -ENXIO; - goto out; - } - - /* Allow only one process to open a particular port at a time */ - spin_lock_irq(&port->inbuf_lock); - if (port->guest_connected) { - spin_unlock_irq(&port->inbuf_lock); - ret = -EMFILE; - goto out; - } - - port->guest_connected = true; - spin_unlock_irq(&port->inbuf_lock); - - spin_lock_irq(&port->outvq_lock); - /* - * There might be a chance that we missed reclaiming a few - * buffers in the window of the port getting previously closed - * and opening now. - */ - reclaim_consumed_buffers(port); - spin_unlock_irq(&port->outvq_lock); - - nonseekable_open(inode, filp); - - /* Notify host of port being opened */ - send_control_msg(filp->private_data, VIRTIO_CONSOLE_PORT_OPEN, 1); - - return 0; -out: - kref_put(&port->kref, remove_port); - return ret; -} - -static int port_fops_fasync(int fd, struct file *filp, int mode) -{ - struct port *port; - - port = filp->private_data; - return fasync_helper(fd, filp, mode, &port->async_queue); -} - -/* - * The file operations that we support: programs in the guest can open - * a console device, read from it, write to it, poll for data and - * close it. The devices are at - * /dev/vport<device number>p<port number> - */ -static const struct file_operations port_fops = { - .owner = THIS_MODULE, - .open = port_fops_open, - .read = port_fops_read, - .write = port_fops_write, - .poll = port_fops_poll, - .release = port_fops_release, - .fasync = port_fops_fasync, - .llseek = no_llseek, -}; - -/* - * The put_chars() callback is pretty straightforward. - * - * We turn the characters into a scatter-gather list, add it to the - * output queue and then kick the Host. Then we sit here waiting for - * it to finish: inefficient in theory, but in practice - * implementations will do it immediately (lguest's Launcher does). - */ -static int put_chars(u32 vtermno, const char *buf, int count) -{ - struct port *port; - - if (unlikely(early_put_chars)) - return early_put_chars(vtermno, buf, count); - - port = find_port_by_vtermno(vtermno); - if (!port) - return -EPIPE; - - return send_buf(port, (void *)buf, count, false); -} - -/* - * get_chars() is the callback from the hvc_console infrastructure - * when an interrupt is received. - * - * We call out to fill_readbuf that gets us the required data from the - * buffers that are queued up. - */ -static int get_chars(u32 vtermno, char *buf, int count) -{ - struct port *port; - - /* If we've not set up the port yet, we have no input to give. */ - if (unlikely(early_put_chars)) - return 0; - - port = find_port_by_vtermno(vtermno); - if (!port) - return -EPIPE; - - /* If we don't have an input queue yet, we can't get input. */ - BUG_ON(!port->in_vq); - - return fill_readbuf(port, buf, count, false); -} - -static void resize_console(struct port *port) -{ - struct virtio_device *vdev; - - /* The port could have been hot-unplugged */ - if (!port || !is_console_port(port)) - return; - - vdev = port->portdev->vdev; - if (virtio_has_feature(vdev, VIRTIO_CONSOLE_F_SIZE)) - hvc_resize(port->cons.hvc, port->cons.ws); -} - -/* We set the configuration at this point, since we now have a tty */ -static int notifier_add_vio(struct hvc_struct *hp, int data) -{ - struct port *port; - - port = find_port_by_vtermno(hp->vtermno); - if (!port) - return -EINVAL; - - hp->irq_requested = 1; - resize_console(port); - - return 0; -} - -static void notifier_del_vio(struct hvc_struct *hp, int data) -{ - hp->irq_requested = 0; -} - -/* The operations for console ports. */ -static const struct hv_ops hv_ops = { - .get_chars = get_chars, - .put_chars = put_chars, - .notifier_add = notifier_add_vio, - .notifier_del = notifier_del_vio, - .notifier_hangup = notifier_del_vio, -}; - -/* - * Console drivers are initialized very early so boot messages can go - * out, so we do things slightly differently from the generic virtio - * initialization of the net and block drivers. - * - * At this stage, the console is output-only. It's too early to set - * up a virtqueue, so we let the drivers do some boutique early-output - * thing. - */ -int __init virtio_cons_early_init(int (*put_chars)(u32, const char *, int)) -{ - early_put_chars = put_chars; - return hvc_instantiate(0, 0, &hv_ops); -} - -int init_port_console(struct port *port) -{ - int ret; - - /* - * The Host's telling us this port is a console port. Hook it - * up with an hvc console. - * - * To set up and manage our virtual console, we call - * hvc_alloc(). - * - * The first argument of hvc_alloc() is the virtual console - * number. The second argument is the parameter for the - * notification mechanism (like irq number). We currently - * leave this as zero, virtqueues have implicit notifications. - * - * The third argument is a "struct hv_ops" containing the - * put_chars() get_chars(), notifier_add() and notifier_del() - * pointers. The final argument is the output buffer size: we - * can do any size, so we put PAGE_SIZE here. - */ - port->cons.vtermno = pdrvdata.next_vtermno; - - port->cons.hvc = hvc_alloc(port->cons.vtermno, 0, &hv_ops, PAGE_SIZE); - if (IS_ERR(port->cons.hvc)) { - ret = PTR_ERR(port->cons.hvc); - dev_err(port->dev, - "error %d allocating hvc for port\n", ret); - port->cons.hvc = NULL; - return ret; - } - spin_lock_irq(&pdrvdata_lock); - pdrvdata.next_vtermno++; - list_add_tail(&port->cons.list, &pdrvdata.consoles); - spin_unlock_irq(&pdrvdata_lock); - port->guest_connected = true; - - /* - * Start using the new console output if this is the first - * console to come up. - */ - if (early_put_chars) - early_put_chars = NULL; - - /* Notify host of port being opened */ - send_control_msg(port, VIRTIO_CONSOLE_PORT_OPEN, 1); - - return 0; -} - -static ssize_t show_port_name(struct device *dev, - struct device_attribute *attr, char *buffer) -{ - struct port *port; - - port = dev_get_drvdata(dev); - - return sprintf(buffer, "%s\n", port->name); -} - -static DEVICE_ATTR(name, S_IRUGO, show_port_name, NULL); - -static struct attribute *port_sysfs_entries[] = { - &dev_attr_name.attr, - NULL -}; - -static struct attribute_group port_attribute_group = { - .name = NULL, /* put in device directory */ - .attrs = port_sysfs_entries, -}; - -static int debugfs_open(struct inode *inode, struct file *filp) -{ - filp->private_data = inode->i_private; - return 0; -} - -static ssize_t debugfs_read(struct file *filp, char __user *ubuf, - size_t count, loff_t *offp) -{ - struct port *port; - char *buf; - ssize_t ret, out_offset, out_count; - - out_count = 1024; - buf = kmalloc(out_count, GFP_KERNEL); - if (!buf) - return -ENOMEM; - - port = filp->private_data; - out_offset = 0; - out_offset += snprintf(buf + out_offset, out_count, - "name: %s\n", port->name ? port->name : ""); - out_offset += snprintf(buf + out_offset, out_count - out_offset, - "guest_connected: %d\n", port->guest_connected); - out_offset += snprintf(buf + out_offset, out_count - out_offset, - "host_connected: %d\n", port->host_connected); - out_offset += snprintf(buf + out_offset, out_count - out_offset, - "outvq_full: %d\n", port->outvq_full); - out_offset += snprintf(buf + out_offset, out_count - out_offset, - "is_console: %s\n", - is_console_port(port) ? "yes" : "no"); - out_offset += snprintf(buf + out_offset, out_count - out_offset, - "console_vtermno: %u\n", port->cons.vtermno); - - ret = simple_read_from_buffer(ubuf, count, offp, buf, out_offset); - kfree(buf); - return ret; -} - -static const struct file_operations port_debugfs_ops = { - .owner = THIS_MODULE, - .open = debugfs_open, - .read = debugfs_read, -}; - -static void set_console_size(struct port *port, u16 rows, u16 cols) -{ - if (!port || !is_console_port(port)) - return; - - port->cons.ws.ws_row = rows; - port->cons.ws.ws_col = cols; -} - -static unsigned int fill_queue(struct virtqueue *vq, spinlock_t *lock) -{ - struct port_buffer *buf; - unsigned int nr_added_bufs; - int ret; - - nr_added_bufs = 0; - do { - buf = alloc_buf(PAGE_SIZE); - if (!buf) - break; - - spin_lock_irq(lock); - ret = add_inbuf(vq, buf); - if (ret < 0) { - spin_unlock_irq(lock); - free_buf(buf); - break; - } - nr_added_bufs++; - spin_unlock_irq(lock); - } while (ret > 0); - - return nr_added_bufs; -} - -static void send_sigio_to_port(struct port *port) -{ - if (port->async_queue && port->guest_connected) - kill_fasync(&port->async_queue, SIGIO, POLL_OUT); -} - -static int add_port(struct ports_device *portdev, u32 id) -{ - char debugfs_name[16]; - struct port *port; - struct port_buffer *buf; - dev_t devt; - unsigned int nr_added_bufs; - int err; - - port = kmalloc(sizeof(*port), GFP_KERNEL); - if (!port) { - err = -ENOMEM; - goto fail; - } - kref_init(&port->kref); - - port->portdev = portdev; - port->id = id; - - port->name = NULL; - port->inbuf = NULL; - port->cons.hvc = NULL; - port->async_queue = NULL; - - port->cons.ws.ws_row = port->cons.ws.ws_col = 0; - - port->host_connected = port->guest_connected = false; - - port->outvq_full = false; - - port->in_vq = portdev->in_vqs[port->id]; - port->out_vq = portdev->out_vqs[port->id]; - - port->cdev = cdev_alloc(); - if (!port->cdev) { - dev_err(&port->portdev->vdev->dev, "Error allocating cdev\n"); - err = -ENOMEM; - goto free_port; - } - port->cdev->ops = &port_fops; - - devt = MKDEV(portdev->chr_major, id); - err = cdev_add(port->cdev, devt, 1); - if (err < 0) { - dev_err(&port->portdev->vdev->dev, - "Error %d adding cdev for port %u\n", err, id); - goto free_cdev; - } - port->dev = device_create(pdrvdata.class, &port->portdev->vdev->dev, - devt, port, "vport%up%u", - port->portdev->drv_index, id); - if (IS_ERR(port->dev)) { - err = PTR_ERR(port->dev); - dev_err(&port->portdev->vdev->dev, - "Error %d creating device for port %u\n", - err, id); - goto free_cdev; - } - - spin_lock_init(&port->inbuf_lock); - spin_lock_init(&port->outvq_lock); - init_waitqueue_head(&port->waitqueue); - - /* Fill the in_vq with buffers so the host can send us data. */ - nr_added_bufs = fill_queue(port->in_vq, &port->inbuf_lock); - if (!nr_added_bufs) { - dev_err(port->dev, "Error allocating inbufs\n"); - err = -ENOMEM; - goto free_device; - } - - /* - * If we're not using multiport support, this has to be a console port - */ - if (!use_multiport(port->portdev)) { - err = init_port_console(port); - if (err) - goto free_inbufs; - } - - spin_lock_irq(&portdev->ports_lock); - list_add_tail(&port->list, &port->portdev->ports); - spin_unlock_irq(&portdev->ports_lock); - - /* - * Tell the Host we're set so that it can send us various - * configuration parameters for this port (eg, port name, - * caching, whether this is a console port, etc.) - */ - send_control_msg(port, VIRTIO_CONSOLE_PORT_READY, 1); - - if (pdrvdata.debugfs_dir) { - /* - * Finally, create the debugfs file that we can use to - * inspect a port's state at any time - */ - sprintf(debugfs_name, "vport%up%u", - port->portdev->drv_index, id); - port->debugfs_file = debugfs_create_file(debugfs_name, 0444, - pdrvdata.debugfs_dir, - port, - &port_debugfs_ops); - } - return 0; - -free_inbufs: - while ((buf = virtqueue_detach_unused_buf(port->in_vq))) - free_buf(buf); -free_device: - device_destroy(pdrvdata.class, port->dev->devt); -free_cdev: - cdev_del(port->cdev); -free_port: - kfree(port); -fail: - /* The host might want to notify management sw about port add failure */ - __send_control_msg(portdev, id, VIRTIO_CONSOLE_PORT_READY, 0); - return err; -} - -/* No users remain, remove all port-specific data. */ -static void remove_port(struct kref *kref) -{ - struct port *port; - - port = container_of(kref, struct port, kref); - - sysfs_remove_group(&port->dev->kobj, &port_attribute_group); - device_destroy(pdrvdata.class, port->dev->devt); - cdev_del(port->cdev); - - kfree(port->name); - - debugfs_remove(port->debugfs_file); - - kfree(port); -} - -/* - * Port got unplugged. Remove port from portdev's list and drop the - * kref reference. If no userspace has this port opened, it will - * result in immediate removal the port. - */ -static void unplug_port(struct port *port) -{ - struct port_buffer *buf; - - spin_lock_irq(&port->portdev->ports_lock); - list_del(&port->list); - spin_unlock_irq(&port->portdev->ports_lock); - - if (port->guest_connected) { - port->guest_connected = false; - port->host_connected = false; - wake_up_interruptible(&port->waitqueue); - - /* Let the app know the port is going down. */ - send_sigio_to_port(port); - } - - if (is_console_port(port)) { - spin_lock_irq(&pdrvdata_lock); - list_del(&port->cons.list); - spin_unlock_irq(&pdrvdata_lock); -#if 0 - /* - * hvc_remove() not called as removing one hvc port - * results in other hvc ports getting frozen. - * - * Once this is resolved in hvc, this functionality - * will be enabled. Till that is done, the -EPIPE - * return from get_chars() above will help - * hvc_console.c to clean up on ports we remove here. - */ - hvc_remove(port->cons.hvc); -#endif - } - - /* Remove unused data this port might have received. */ - discard_port_data(port); - - reclaim_consumed_buffers(port); - - /* Remove buffers we queued up for the Host to send us data in. */ - while ((buf = virtqueue_detach_unused_buf(port->in_vq))) - free_buf(buf); - - /* - * We should just assume the device itself has gone off -- - * else a close on an open port later will try to send out a - * control message. - */ - port->portdev = NULL; - - /* - * Locks around here are not necessary - a port can't be - * opened after we removed the port struct from ports_list - * above. - */ - kref_put(&port->kref, remove_port); -} - -/* Any private messages that the Host and Guest want to share */ -static void handle_control_message(struct ports_device *portdev, - struct port_buffer *buf) -{ - struct virtio_console_control *cpkt; - struct port *port; - size_t name_size; - int err; - - cpkt = (struct virtio_console_control *)(buf->buf + buf->offset); - - port = find_port_by_id(portdev, cpkt->id); - if (!port && cpkt->event != VIRTIO_CONSOLE_PORT_ADD) { - /* No valid header at start of buffer. Drop it. */ - dev_dbg(&portdev->vdev->dev, - "Invalid index %u in control packet\n", cpkt->id); - return; - } - - switch (cpkt->event) { - case VIRTIO_CONSOLE_PORT_ADD: - if (port) { - dev_dbg(&portdev->vdev->dev, - "Port %u already added\n", port->id); - send_control_msg(port, VIRTIO_CONSOLE_PORT_READY, 1); - break; - } - if (cpkt->id >= portdev->config.max_nr_ports) { - dev_warn(&portdev->vdev->dev, - "Request for adding port with out-of-bound id %u, max. supported id: %u\n", - cpkt->id, portdev->config.max_nr_ports - 1); - break; - } - add_port(portdev, cpkt->id); - break; - case VIRTIO_CONSOLE_PORT_REMOVE: - unplug_port(port); - break; - case VIRTIO_CONSOLE_CONSOLE_PORT: - if (!cpkt->value) - break; - if (is_console_port(port)) - break; - - init_port_console(port); - /* - * Could remove the port here in case init fails - but - * have to notify the host first. - */ - break; - case VIRTIO_CONSOLE_RESIZE: { - struct { - __u16 rows; - __u16 cols; - } size; - - if (!is_console_port(port)) - break; - - memcpy(&size, buf->buf + buf->offset + sizeof(*cpkt), - sizeof(size)); - set_console_size(port, size.rows, size.cols); - - port->cons.hvc->irq_requested = 1; - resize_console(port); - break; - } - case VIRTIO_CONSOLE_PORT_OPEN: - port->host_connected = cpkt->value; - wake_up_interruptible(&port->waitqueue); - /* - * If the host port got closed and the host had any - * unconsumed buffers, we'll be able to reclaim them - * now. - */ - spin_lock_irq(&port->outvq_lock); - reclaim_consumed_buffers(port); - spin_unlock_irq(&port->outvq_lock); - - /* - * If the guest is connected, it'll be interested in - * knowing the host connection state changed. - */ - send_sigio_to_port(port); - break; - case VIRTIO_CONSOLE_PORT_NAME: - /* - * Skip the size of the header and the cpkt to get the size - * of the name that was sent - */ - name_size = buf->len - buf->offset - sizeof(*cpkt) + 1; - - port->name = kmalloc(name_size, GFP_KERNEL); - if (!port->name) { - dev_err(port->dev, - "Not enough space to store port name\n"); - break; - } - strncpy(port->name, buf->buf + buf->offset + sizeof(*cpkt), - name_size - 1); - port->name[name_size - 1] = 0; - - /* - * Since we only have one sysfs attribute, 'name', - * create it only if we have a name for the port. - */ - err = sysfs_create_group(&port->dev->kobj, - &port_attribute_group); - if (err) { - dev_err(port->dev, - "Error %d creating sysfs device attributes\n", - err); - } else { - /* - * Generate a udev event so that appropriate - * symlinks can be created based on udev - * rules. - */ - kobject_uevent(&port->dev->kobj, KOBJ_CHANGE); - } - break; - } -} - -static void control_work_handler(struct work_struct *work) -{ - struct ports_device *portdev; - struct virtqueue *vq; - struct port_buffer *buf; - unsigned int len; - - portdev = container_of(work, struct ports_device, control_work); - vq = portdev->c_ivq; - - spin_lock(&portdev->cvq_lock); - while ((buf = virtqueue_get_buf(vq, &len))) { - spin_unlock(&portdev->cvq_lock); - - buf->len = len; - buf->offset = 0; - - handle_control_message(portdev, buf); - - spin_lock(&portdev->cvq_lock); - if (add_inbuf(portdev->c_ivq, buf) < 0) { - dev_warn(&portdev->vdev->dev, - "Error adding buffer to queue\n"); - free_buf(buf); - } - } - spin_unlock(&portdev->cvq_lock); -} - -static void in_intr(struct virtqueue *vq) -{ - struct port *port; - unsigned long flags; - - port = find_port_by_vq(vq->vdev->priv, vq); - if (!port) - return; - - spin_lock_irqsave(&port->inbuf_lock, flags); - if (!port->inbuf) - port->inbuf = get_inbuf(port); - - /* - * Don't queue up data when port is closed. This condition - * can be reached when a console port is not yet connected (no - * tty is spawned) and the host sends out data to console - * ports. For generic serial ports, the host won't - * (shouldn't) send data till the guest is connected. - */ - if (!port->guest_connected) - discard_port_data(port); - - spin_unlock_irqrestore(&port->inbuf_lock, flags); - - wake_up_interruptible(&port->waitqueue); - - /* Send a SIGIO indicating new data in case the process asked for it */ - send_sigio_to_port(port); - - if (is_console_port(port) && hvc_poll(port->cons.hvc)) - hvc_kick(); -} - -static void control_intr(struct virtqueue *vq) -{ - struct ports_device *portdev; - - portdev = vq->vdev->priv; - schedule_work(&portdev->control_work); -} - -static void config_intr(struct virtio_device *vdev) -{ - struct ports_device *portdev; - - portdev = vdev->priv; - - if (!use_multiport(portdev)) { - struct port *port; - u16 rows, cols; - - vdev->config->get(vdev, - offsetof(struct virtio_console_config, cols), - &cols, sizeof(u16)); - vdev->config->get(vdev, - offsetof(struct virtio_console_config, rows), - &rows, sizeof(u16)); - - port = find_port_by_id(portdev, 0); - set_console_size(port, rows, cols); - - /* - * We'll use this way of resizing only for legacy - * support. For newer userspace - * (VIRTIO_CONSOLE_F_MULTPORT+), use control messages - * to indicate console size changes so that it can be - * done per-port. - */ - resize_console(port); - } -} - -static int init_vqs(struct ports_device *portdev) -{ - vq_callback_t **io_callbacks; - char **io_names; - struct virtqueue **vqs; - u32 i, j, nr_ports, nr_queues; - int err; - - nr_ports = portdev->config.max_nr_ports; - nr_queues = use_multiport(portdev) ? (nr_ports + 1) * 2 : 2; - - vqs = kmalloc(nr_queues * sizeof(struct virtqueue *), GFP_KERNEL); - io_callbacks = kmalloc(nr_queues * sizeof(vq_callback_t *), GFP_KERNEL); - io_names = kmalloc(nr_queues * sizeof(char *), GFP_KERNEL); - portdev->in_vqs = kmalloc(nr_ports * sizeof(struct virtqueue *), - GFP_KERNEL); - portdev->out_vqs = kmalloc(nr_ports * sizeof(struct virtqueue *), - GFP_KERNEL); - if (!vqs || !io_callbacks || !io_names || !portdev->in_vqs || - !portdev->out_vqs) { - err = -ENOMEM; - goto free; - } - - /* - * For backward compat (newer host but older guest), the host - * spawns a console port first and also inits the vqs for port - * 0 before others. - */ - j = 0; - io_callbacks[j] = in_intr; - io_callbacks[j + 1] = NULL; - io_names[j] = "input"; - io_names[j + 1] = "output"; - j += 2; - - if (use_multiport(portdev)) { - io_callbacks[j] = control_intr; - io_callbacks[j + 1] = NULL; - io_names[j] = "control-i"; - io_names[j + 1] = "control-o"; - - for (i = 1; i < nr_ports; i++) { - j += 2; - io_callbacks[j] = in_intr; - io_callbacks[j + 1] = NULL; - io_names[j] = "input"; - io_names[j + 1] = "output"; - } - } - /* Find the queues. */ - err = portdev->vdev->config->find_vqs(portdev->vdev, nr_queues, vqs, - io_callbacks, - (const char **)io_names); - if (err) - goto free; - - j = 0; - portdev->in_vqs[0] = vqs[0]; - portdev->out_vqs[0] = vqs[1]; - j += 2; - if (use_multiport(portdev)) { - portdev->c_ivq = vqs[j]; - portdev->c_ovq = vqs[j + 1]; - - for (i = 1; i < nr_ports; i++) { - j += 2; - portdev->in_vqs[i] = vqs[j]; - portdev->out_vqs[i] = vqs[j + 1]; - } - } - kfree(io_names); - kfree(io_callbacks); - kfree(vqs); - - return 0; - -free: - kfree(portdev->out_vqs); - kfree(portdev->in_vqs); - kfree(io_names); - kfree(io_callbacks); - kfree(vqs); - - return err; -} - -static const struct file_operations portdev_fops = { - .owner = THIS_MODULE, -}; - -/* - * Once we're further in boot, we get probed like any other virtio - * device. - * - * If the host also supports multiple console ports, we check the - * config space to see how many ports the host has spawned. We - * initialize each port found. - */ -static int __devinit virtcons_probe(struct virtio_device *vdev) -{ - struct ports_device *portdev; - int err; - bool multiport; - - portdev = kmalloc(sizeof(*portdev), GFP_KERNEL); - if (!portdev) { - err = -ENOMEM; - goto fail; - } - - /* Attach this portdev to this virtio_device, and vice-versa. */ - portdev->vdev = vdev; - vdev->priv = portdev; - - spin_lock_irq(&pdrvdata_lock); - portdev->drv_index = pdrvdata.index++; - spin_unlock_irq(&pdrvdata_lock); - - portdev->chr_major = register_chrdev(0, "virtio-portsdev", - &portdev_fops); - if (portdev->chr_major < 0) { - dev_err(&vdev->dev, - "Error %d registering chrdev for device %u\n", - portdev->chr_major, portdev->drv_index); - err = portdev->chr_major; - goto free; - } - - multiport = false; - portdev->config.max_nr_ports = 1; - if (virtio_has_feature(vdev, VIRTIO_CONSOLE_F_MULTIPORT)) { - multiport = true; - vdev->features[0] |= 1 << VIRTIO_CONSOLE_F_MULTIPORT; - - vdev->config->get(vdev, offsetof(struct virtio_console_config, - max_nr_ports), - &portdev->config.max_nr_ports, - sizeof(portdev->config.max_nr_ports)); - } - - /* Let the Host know we support multiple ports.*/ - vdev->config->finalize_features(vdev); - - err = init_vqs(portdev); - if (err < 0) { - dev_err(&vdev->dev, "Error %d initializing vqs\n", err); - goto free_chrdev; - } - - spin_lock_init(&portdev->ports_lock); - INIT_LIST_HEAD(&portdev->ports); - - if (multiport) { - unsigned int nr_added_bufs; - - spin_lock_init(&portdev->cvq_lock); - INIT_WORK(&portdev->control_work, &control_work_handler); - - nr_added_bufs = fill_queue(portdev->c_ivq, &portdev->cvq_lock); - if (!nr_added_bufs) { - dev_err(&vdev->dev, - "Error allocating buffers for control queue\n"); - err = -ENOMEM; - goto free_vqs; - } - } else { - /* - * For backward compatibility: Create a console port - * if we're running on older host. - */ - add_port(portdev, 0); - } - - spin_lock_irq(&pdrvdata_lock); - list_add_tail(&portdev->list, &pdrvdata.portdevs); - spin_unlock_irq(&pdrvdata_lock); - - __send_control_msg(portdev, VIRTIO_CONSOLE_BAD_ID, - VIRTIO_CONSOLE_DEVICE_READY, 1); - return 0; - -free_vqs: - /* The host might want to notify mgmt sw about device add failure */ - __send_control_msg(portdev, VIRTIO_CONSOLE_BAD_ID, - VIRTIO_CONSOLE_DEVICE_READY, 0); - vdev->config->del_vqs(vdev); - kfree(portdev->in_vqs); - kfree(portdev->out_vqs); -free_chrdev: - unregister_chrdev(portdev->chr_major, "virtio-portsdev"); -free: - kfree(portdev); -fail: - return err; -} - -static void virtcons_remove(struct virtio_device *vdev) -{ - struct ports_device *portdev; - struct port *port, *port2; - - portdev = vdev->priv; - - spin_lock_irq(&pdrvdata_lock); - list_del(&portdev->list); - spin_unlock_irq(&pdrvdata_lock); - - /* Disable interrupts for vqs */ - vdev->config->reset(vdev); - /* Finish up work that's lined up */ - cancel_work_sync(&portdev->control_work); - - list_for_each_entry_safe(port, port2, &portdev->ports, list) - unplug_port(port); - - unregister_chrdev(portdev->chr_major, "virtio-portsdev"); - - /* - * When yanking out a device, we immediately lose the - * (device-side) queues. So there's no point in keeping the - * guest side around till we drop our final reference. This - * also means that any ports which are in an open state will - * have to just stop using the port, as the vqs are going - * away. - */ - if (use_multiport(portdev)) { - struct port_buffer *buf; - unsigned int len; - - while ((buf = virtqueue_get_buf(portdev->c_ivq, &len))) - free_buf(buf); - - while ((buf = virtqueue_detach_unused_buf(portdev->c_ivq))) - free_buf(buf); - } - - vdev->config->del_vqs(vdev); - kfree(portdev->in_vqs); - kfree(portdev->out_vqs); - - kfree(portdev); -} - -static struct virtio_device_id id_table[] = { - { VIRTIO_ID_CONSOLE, VIRTIO_DEV_ANY_ID }, - { 0 }, -}; - -static unsigned int features[] = { - VIRTIO_CONSOLE_F_SIZE, - VIRTIO_CONSOLE_F_MULTIPORT, -}; - -static struct virtio_driver virtio_console = { - .feature_table = features, - .feature_table_size = ARRAY_SIZE(features), - .driver.name = KBUILD_MODNAME, - .driver.owner = THIS_MODULE, - .id_table = id_table, - .probe = virtcons_probe, - .remove = virtcons_remove, - .config_changed = config_intr, -}; - -static int __init init(void) -{ - int err; - - pdrvdata.class = class_create(THIS_MODULE, "virtio-ports"); - if (IS_ERR(pdrvdata.class)) { - err = PTR_ERR(pdrvdata.class); - pr_err("Error %d creating virtio-ports class\n", err); - return err; - } - - pdrvdata.debugfs_dir = debugfs_create_dir("virtio-ports", NULL); - if (!pdrvdata.debugfs_dir) { - pr_warning("Error %ld creating debugfs dir for virtio-ports\n", - PTR_ERR(pdrvdata.debugfs_dir)); - } - INIT_LIST_HEAD(&pdrvdata.consoles); - INIT_LIST_HEAD(&pdrvdata.portdevs); - - return register_virtio_driver(&virtio_console); -} - -static void __exit fini(void) -{ - unregister_virtio_driver(&virtio_console); - - class_destroy(pdrvdata.class); - if (pdrvdata.debugfs_dir) - debugfs_remove_recursive(pdrvdata.debugfs_dir); -} -module_init(init); -module_exit(fini); - -MODULE_DEVICE_TABLE(virtio, id_table); -MODULE_DESCRIPTION("Virtio console driver"); -MODULE_LICENSE("GPL"); |