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-rw-r--r--drivers/xen/evtchn.c507
1 files changed, 507 insertions, 0 deletions
diff --git a/drivers/xen/evtchn.c b/drivers/xen/evtchn.c
new file mode 100644
index 00000000000..af031950f9b
--- /dev/null
+++ b/drivers/xen/evtchn.c
@@ -0,0 +1,507 @@
+/******************************************************************************
+ * evtchn.c
+ *
+ * Driver for receiving and demuxing event-channel signals.
+ *
+ * Copyright (c) 2004-2005, K A Fraser
+ * Multi-process extensions Copyright (c) 2004, Steven Smith
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License version 2
+ * as published by the Free Software Foundation; or, when distributed
+ * separately from the Linux kernel or incorporated into other
+ * software packages, subject to the following license:
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this source file (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use, copy, modify,
+ * merge, publish, distribute, sublicense, and/or sell copies of the Software,
+ * and to permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/slab.h>
+#include <linux/string.h>
+#include <linux/errno.h>
+#include <linux/fs.h>
+#include <linux/errno.h>
+#include <linux/miscdevice.h>
+#include <linux/major.h>
+#include <linux/proc_fs.h>
+#include <linux/stat.h>
+#include <linux/poll.h>
+#include <linux/irq.h>
+#include <linux/init.h>
+#include <linux/gfp.h>
+#include <linux/mutex.h>
+#include <linux/cpu.h>
+#include <xen/events.h>
+#include <xen/evtchn.h>
+#include <asm/xen/hypervisor.h>
+
+struct per_user_data {
+ struct mutex bind_mutex; /* serialize bind/unbind operations */
+
+ /* Notification ring, accessed via /dev/xen/evtchn. */
+#define EVTCHN_RING_SIZE (PAGE_SIZE / sizeof(evtchn_port_t))
+#define EVTCHN_RING_MASK(_i) ((_i)&(EVTCHN_RING_SIZE-1))
+ evtchn_port_t *ring;
+ unsigned int ring_cons, ring_prod, ring_overflow;
+ struct mutex ring_cons_mutex; /* protect against concurrent readers */
+
+ /* Processes wait on this queue when ring is empty. */
+ wait_queue_head_t evtchn_wait;
+ struct fasync_struct *evtchn_async_queue;
+ const char *name;
+};
+
+/* Who's bound to each port? */
+static struct per_user_data *port_user[NR_EVENT_CHANNELS];
+static DEFINE_SPINLOCK(port_user_lock); /* protects port_user[] and ring_prod */
+
+irqreturn_t evtchn_interrupt(int irq, void *data)
+{
+ unsigned int port = (unsigned long)data;
+ struct per_user_data *u;
+
+ spin_lock(&port_user_lock);
+
+ u = port_user[port];
+
+ disable_irq_nosync(irq);
+
+ if ((u->ring_prod - u->ring_cons) < EVTCHN_RING_SIZE) {
+ u->ring[EVTCHN_RING_MASK(u->ring_prod)] = port;
+ wmb(); /* Ensure ring contents visible */
+ if (u->ring_cons == u->ring_prod++) {
+ wake_up_interruptible(&u->evtchn_wait);
+ kill_fasync(&u->evtchn_async_queue,
+ SIGIO, POLL_IN);
+ }
+ } else {
+ u->ring_overflow = 1;
+ }
+
+ spin_unlock(&port_user_lock);
+
+ return IRQ_HANDLED;
+}
+
+static ssize_t evtchn_read(struct file *file, char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ int rc;
+ unsigned int c, p, bytes1 = 0, bytes2 = 0;
+ struct per_user_data *u = file->private_data;
+
+ /* Whole number of ports. */
+ count &= ~(sizeof(evtchn_port_t)-1);
+
+ if (count == 0)
+ return 0;
+
+ if (count > PAGE_SIZE)
+ count = PAGE_SIZE;
+
+ for (;;) {
+ mutex_lock(&u->ring_cons_mutex);
+
+ rc = -EFBIG;
+ if (u->ring_overflow)
+ goto unlock_out;
+
+ c = u->ring_cons;
+ p = u->ring_prod;
+ if (c != p)
+ break;
+
+ mutex_unlock(&u->ring_cons_mutex);
+
+ if (file->f_flags & O_NONBLOCK)
+ return -EAGAIN;
+
+ rc = wait_event_interruptible(u->evtchn_wait,
+ u->ring_cons != u->ring_prod);
+ if (rc)
+ return rc;
+ }
+
+ /* Byte lengths of two chunks. Chunk split (if any) is at ring wrap. */
+ if (((c ^ p) & EVTCHN_RING_SIZE) != 0) {
+ bytes1 = (EVTCHN_RING_SIZE - EVTCHN_RING_MASK(c)) *
+ sizeof(evtchn_port_t);
+ bytes2 = EVTCHN_RING_MASK(p) * sizeof(evtchn_port_t);
+ } else {
+ bytes1 = (p - c) * sizeof(evtchn_port_t);
+ bytes2 = 0;
+ }
+
+ /* Truncate chunks according to caller's maximum byte count. */
+ if (bytes1 > count) {
+ bytes1 = count;
+ bytes2 = 0;
+ } else if ((bytes1 + bytes2) > count) {
+ bytes2 = count - bytes1;
+ }
+
+ rc = -EFAULT;
+ rmb(); /* Ensure that we see the port before we copy it. */
+ if (copy_to_user(buf, &u->ring[EVTCHN_RING_MASK(c)], bytes1) ||
+ ((bytes2 != 0) &&
+ copy_to_user(&buf[bytes1], &u->ring[0], bytes2)))
+ goto unlock_out;
+
+ u->ring_cons += (bytes1 + bytes2) / sizeof(evtchn_port_t);
+ rc = bytes1 + bytes2;
+
+ unlock_out:
+ mutex_unlock(&u->ring_cons_mutex);
+ return rc;
+}
+
+static ssize_t evtchn_write(struct file *file, const char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ int rc, i;
+ evtchn_port_t *kbuf = (evtchn_port_t *)__get_free_page(GFP_KERNEL);
+ struct per_user_data *u = file->private_data;
+
+ if (kbuf == NULL)
+ return -ENOMEM;
+
+ /* Whole number of ports. */
+ count &= ~(sizeof(evtchn_port_t)-1);
+
+ rc = 0;
+ if (count == 0)
+ goto out;
+
+ if (count > PAGE_SIZE)
+ count = PAGE_SIZE;
+
+ rc = -EFAULT;
+ if (copy_from_user(kbuf, buf, count) != 0)
+ goto out;
+
+ spin_lock_irq(&port_user_lock);
+ for (i = 0; i < (count/sizeof(evtchn_port_t)); i++)
+ if ((kbuf[i] < NR_EVENT_CHANNELS) && (port_user[kbuf[i]] == u))
+ enable_irq(irq_from_evtchn(kbuf[i]));
+ spin_unlock_irq(&port_user_lock);
+
+ rc = count;
+
+ out:
+ free_page((unsigned long)kbuf);
+ return rc;
+}
+
+static int evtchn_bind_to_user(struct per_user_data *u, int port)
+{
+ int rc = 0;
+
+ /*
+ * Ports are never reused, so every caller should pass in a
+ * unique port.
+ *
+ * (Locking not necessary because we haven't registered the
+ * interrupt handler yet, and our caller has already
+ * serialized bind operations.)
+ */
+ BUG_ON(port_user[port] != NULL);
+ port_user[port] = u;
+
+ rc = bind_evtchn_to_irqhandler(port, evtchn_interrupt, IRQF_DISABLED,
+ u->name, (void *)(unsigned long)port);
+ if (rc >= 0)
+ rc = 0;
+
+ return rc;
+}
+
+static void evtchn_unbind_from_user(struct per_user_data *u, int port)
+{
+ int irq = irq_from_evtchn(port);
+
+ unbind_from_irqhandler(irq, (void *)(unsigned long)port);
+
+ /* make sure we unbind the irq handler before clearing the port */
+ barrier();
+
+ port_user[port] = NULL;
+}
+
+static long evtchn_ioctl(struct file *file,
+ unsigned int cmd, unsigned long arg)
+{
+ int rc;
+ struct per_user_data *u = file->private_data;
+ void __user *uarg = (void __user *) arg;
+
+ /* Prevent bind from racing with unbind */
+ mutex_lock(&u->bind_mutex);
+
+ switch (cmd) {
+ case IOCTL_EVTCHN_BIND_VIRQ: {
+ struct ioctl_evtchn_bind_virq bind;
+ struct evtchn_bind_virq bind_virq;
+
+ rc = -EFAULT;
+ if (copy_from_user(&bind, uarg, sizeof(bind)))
+ break;
+
+ bind_virq.virq = bind.virq;
+ bind_virq.vcpu = 0;
+ rc = HYPERVISOR_event_channel_op(EVTCHNOP_bind_virq,
+ &bind_virq);
+ if (rc != 0)
+ break;
+
+ rc = evtchn_bind_to_user(u, bind_virq.port);
+ if (rc == 0)
+ rc = bind_virq.port;
+ break;
+ }
+
+ case IOCTL_EVTCHN_BIND_INTERDOMAIN: {
+ struct ioctl_evtchn_bind_interdomain bind;
+ struct evtchn_bind_interdomain bind_interdomain;
+
+ rc = -EFAULT;
+ if (copy_from_user(&bind, uarg, sizeof(bind)))
+ break;
+
+ bind_interdomain.remote_dom = bind.remote_domain;
+ bind_interdomain.remote_port = bind.remote_port;
+ rc = HYPERVISOR_event_channel_op(EVTCHNOP_bind_interdomain,
+ &bind_interdomain);
+ if (rc != 0)
+ break;
+
+ rc = evtchn_bind_to_user(u, bind_interdomain.local_port);
+ if (rc == 0)
+ rc = bind_interdomain.local_port;
+ break;
+ }
+
+ case IOCTL_EVTCHN_BIND_UNBOUND_PORT: {
+ struct ioctl_evtchn_bind_unbound_port bind;
+ struct evtchn_alloc_unbound alloc_unbound;
+
+ rc = -EFAULT;
+ if (copy_from_user(&bind, uarg, sizeof(bind)))
+ break;
+
+ alloc_unbound.dom = DOMID_SELF;
+ alloc_unbound.remote_dom = bind.remote_domain;
+ rc = HYPERVISOR_event_channel_op(EVTCHNOP_alloc_unbound,
+ &alloc_unbound);
+ if (rc != 0)
+ break;
+
+ rc = evtchn_bind_to_user(u, alloc_unbound.port);
+ if (rc == 0)
+ rc = alloc_unbound.port;
+ break;
+ }
+
+ case IOCTL_EVTCHN_UNBIND: {
+ struct ioctl_evtchn_unbind unbind;
+
+ rc = -EFAULT;
+ if (copy_from_user(&unbind, uarg, sizeof(unbind)))
+ break;
+
+ rc = -EINVAL;
+ if (unbind.port >= NR_EVENT_CHANNELS)
+ break;
+
+ spin_lock_irq(&port_user_lock);
+
+ rc = -ENOTCONN;
+ if (port_user[unbind.port] != u) {
+ spin_unlock_irq(&port_user_lock);
+ break;
+ }
+
+ evtchn_unbind_from_user(u, unbind.port);
+
+ spin_unlock_irq(&port_user_lock);
+
+ rc = 0;
+ break;
+ }
+
+ case IOCTL_EVTCHN_NOTIFY: {
+ struct ioctl_evtchn_notify notify;
+
+ rc = -EFAULT;
+ if (copy_from_user(&notify, uarg, sizeof(notify)))
+ break;
+
+ if (notify.port >= NR_EVENT_CHANNELS) {
+ rc = -EINVAL;
+ } else if (port_user[notify.port] != u) {
+ rc = -ENOTCONN;
+ } else {
+ notify_remote_via_evtchn(notify.port);
+ rc = 0;
+ }
+ break;
+ }
+
+ case IOCTL_EVTCHN_RESET: {
+ /* Initialise the ring to empty. Clear errors. */
+ mutex_lock(&u->ring_cons_mutex);
+ spin_lock_irq(&port_user_lock);
+ u->ring_cons = u->ring_prod = u->ring_overflow = 0;
+ spin_unlock_irq(&port_user_lock);
+ mutex_unlock(&u->ring_cons_mutex);
+ rc = 0;
+ break;
+ }
+
+ default:
+ rc = -ENOSYS;
+ break;
+ }
+ mutex_unlock(&u->bind_mutex);
+
+ return rc;
+}
+
+static unsigned int evtchn_poll(struct file *file, poll_table *wait)
+{
+ unsigned int mask = POLLOUT | POLLWRNORM;
+ struct per_user_data *u = file->private_data;
+
+ poll_wait(file, &u->evtchn_wait, wait);
+ if (u->ring_cons != u->ring_prod)
+ mask |= POLLIN | POLLRDNORM;
+ if (u->ring_overflow)
+ mask = POLLERR;
+ return mask;
+}
+
+static int evtchn_fasync(int fd, struct file *filp, int on)
+{
+ struct per_user_data *u = filp->private_data;
+ return fasync_helper(fd, filp, on, &u->evtchn_async_queue);
+}
+
+static int evtchn_open(struct inode *inode, struct file *filp)
+{
+ struct per_user_data *u;
+
+ u = kzalloc(sizeof(*u), GFP_KERNEL);
+ if (u == NULL)
+ return -ENOMEM;
+
+ u->name = kasprintf(GFP_KERNEL, "evtchn:%s", current->comm);
+ if (u->name == NULL) {
+ kfree(u);
+ return -ENOMEM;
+ }
+
+ init_waitqueue_head(&u->evtchn_wait);
+
+ u->ring = (evtchn_port_t *)__get_free_page(GFP_KERNEL);
+ if (u->ring == NULL) {
+ kfree(u->name);
+ kfree(u);
+ return -ENOMEM;
+ }
+
+ mutex_init(&u->bind_mutex);
+ mutex_init(&u->ring_cons_mutex);
+
+ filp->private_data = u;
+
+ return 0;
+}
+
+static int evtchn_release(struct inode *inode, struct file *filp)
+{
+ int i;
+ struct per_user_data *u = filp->private_data;
+
+ spin_lock_irq(&port_user_lock);
+
+ free_page((unsigned long)u->ring);
+
+ for (i = 0; i < NR_EVENT_CHANNELS; i++) {
+ if (port_user[i] != u)
+ continue;
+
+ evtchn_unbind_from_user(port_user[i], i);
+ }
+
+ spin_unlock_irq(&port_user_lock);
+
+ kfree(u->name);
+ kfree(u);
+
+ return 0;
+}
+
+static const struct file_operations evtchn_fops = {
+ .owner = THIS_MODULE,
+ .read = evtchn_read,
+ .write = evtchn_write,
+ .unlocked_ioctl = evtchn_ioctl,
+ .poll = evtchn_poll,
+ .fasync = evtchn_fasync,
+ .open = evtchn_open,
+ .release = evtchn_release,
+};
+
+static struct miscdevice evtchn_miscdev = {
+ .minor = MISC_DYNAMIC_MINOR,
+ .name = "evtchn",
+ .fops = &evtchn_fops,
+};
+static int __init evtchn_init(void)
+{
+ int err;
+
+ if (!xen_domain())
+ return -ENODEV;
+
+ spin_lock_init(&port_user_lock);
+ memset(port_user, 0, sizeof(port_user));
+
+ /* Create '/dev/misc/evtchn'. */
+ err = misc_register(&evtchn_miscdev);
+ if (err != 0) {
+ printk(KERN_ALERT "Could not register /dev/misc/evtchn\n");
+ return err;
+ }
+
+ printk(KERN_INFO "Event-channel device installed.\n");
+
+ return 0;
+}
+
+static void __exit evtchn_cleanup(void)
+{
+ misc_deregister(&evtchn_miscdev);
+}
+
+module_init(evtchn_init);
+module_exit(evtchn_cleanup);
+
+MODULE_LICENSE("GPL");
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