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Diffstat (limited to 'drivers/s390/cio/cio.c')
-rw-r--r--drivers/s390/cio/cio.c341
1 files changed, 206 insertions, 135 deletions
diff --git a/drivers/s390/cio/cio.c b/drivers/s390/cio/cio.c
index b32d7eb3d81..3db2c386546 100644
--- a/drivers/s390/cio/cio.c
+++ b/drivers/s390/cio/cio.c
@@ -2,7 +2,7 @@
* drivers/s390/cio/cio.c
* S/390 common I/O routines -- low level i/o calls
*
- * Copyright (C) IBM Corp. 1999,2006
+ * Copyright IBM Corp. 1999,2008
* Author(s): Ingo Adlung (adlung@de.ibm.com)
* Cornelia Huck (cornelia.huck@de.ibm.com)
* Arnd Bergmann (arndb@de.ibm.com)
@@ -24,7 +24,9 @@
#include <asm/ipl.h>
#include <asm/chpid.h>
#include <asm/airq.h>
+#include <asm/isc.h>
#include <asm/cpu.h>
+#include <asm/fcx.h>
#include "cio.h"
#include "css.h"
#include "chsc.h"
@@ -72,7 +74,6 @@ out_unregister:
debug_unregister(cio_debug_trace_id);
if (cio_debug_crw_id)
debug_unregister(cio_debug_crw_id);
- printk(KERN_WARNING"cio: could not initialize debugging\n");
return -1;
}
@@ -113,6 +114,7 @@ cio_tpi(void)
struct tpi_info *tpi_info;
struct subchannel *sch;
struct irb *irb;
+ int irq_context;
tpi_info = (struct tpi_info *) __LC_SUBCHANNEL_ID;
if (tpi (NULL) != 1)
@@ -125,15 +127,18 @@ cio_tpi(void)
sch = (struct subchannel *)(unsigned long)tpi_info->intparm;
if (!sch)
return 1;
- local_bh_disable();
+ irq_context = in_interrupt();
+ if (!irq_context)
+ local_bh_disable();
irq_enter ();
spin_lock(sch->lock);
- memcpy (&sch->schib.scsw, &irb->scsw, sizeof (struct scsw));
+ memcpy(&sch->schib.scsw, &irb->scsw, sizeof(union scsw));
if (sch->driver && sch->driver->irq)
sch->driver->irq(sch);
spin_unlock(sch->lock);
irq_exit ();
- _local_bh_enable();
+ if (!irq_context)
+ _local_bh_enable();
return 1;
}
@@ -152,7 +157,7 @@ cio_start_handle_notoper(struct subchannel *sch, __u8 lpm)
CIO_MSG_EVENT(2, "cio_start: 'not oper' status for "
"subchannel 0.%x.%04x!\n", sch->schid.ssid,
sch->schid.sch_no);
- sprintf(dbf_text, "no%s", sch->dev.bus_id);
+ sprintf(dbf_text, "no%s", dev_name(&sch->dev));
CIO_TRACE_EVENT(0, dbf_text);
CIO_HEX_EVENT(0, &sch->schib, sizeof (struct schib));
@@ -167,30 +172,31 @@ cio_start_key (struct subchannel *sch, /* subchannel structure */
{
char dbf_txt[15];
int ccode;
- struct orb *orb;
+ union orb *orb;
CIO_TRACE_EVENT(4, "stIO");
- CIO_TRACE_EVENT(4, sch->dev.bus_id);
+ CIO_TRACE_EVENT(4, dev_name(&sch->dev));
orb = &to_io_private(sch)->orb;
+ memset(orb, 0, sizeof(union orb));
/* sch is always under 2G. */
- orb->intparm = (u32)(addr_t)sch;
- orb->fmt = 1;
+ orb->cmd.intparm = (u32)(addr_t)sch;
+ orb->cmd.fmt = 1;
- orb->pfch = sch->options.prefetch == 0;
- orb->spnd = sch->options.suspend;
- orb->ssic = sch->options.suspend && sch->options.inter;
- orb->lpm = (lpm != 0) ? lpm : sch->lpm;
+ orb->cmd.pfch = sch->options.prefetch == 0;
+ orb->cmd.spnd = sch->options.suspend;
+ orb->cmd.ssic = sch->options.suspend && sch->options.inter;
+ orb->cmd.lpm = (lpm != 0) ? lpm : sch->lpm;
#ifdef CONFIG_64BIT
/*
* for 64 bit we always support 64 bit IDAWs with 4k page size only
*/
- orb->c64 = 1;
- orb->i2k = 0;
+ orb->cmd.c64 = 1;
+ orb->cmd.i2k = 0;
#endif
- orb->key = key >> 4;
+ orb->cmd.key = key >> 4;
/* issue "Start Subchannel" */
- orb->cpa = (__u32) __pa(cpa);
+ orb->cmd.cpa = (__u32) __pa(cpa);
ccode = ssch(sch->schid, orb);
/* process condition code */
@@ -202,13 +208,15 @@ cio_start_key (struct subchannel *sch, /* subchannel structure */
/*
* initialize device status information
*/
- sch->schib.scsw.actl |= SCSW_ACTL_START_PEND;
+ sch->schib.scsw.cmd.actl |= SCSW_ACTL_START_PEND;
return 0;
case 1: /* status pending */
case 2: /* busy */
return -EBUSY;
- default: /* device/path not operational */
+ case 3: /* device/path not operational */
return cio_start_handle_notoper(sch, lpm);
+ default:
+ return ccode;
}
}
@@ -228,7 +236,7 @@ cio_resume (struct subchannel *sch)
int ccode;
CIO_TRACE_EVENT (4, "resIO");
- CIO_TRACE_EVENT (4, sch->dev.bus_id);
+ CIO_TRACE_EVENT(4, dev_name(&sch->dev));
ccode = rsch (sch->schid);
@@ -237,7 +245,7 @@ cio_resume (struct subchannel *sch)
switch (ccode) {
case 0:
- sch->schib.scsw.actl |= SCSW_ACTL_RESUME_PEND;
+ sch->schib.scsw.cmd.actl |= SCSW_ACTL_RESUME_PEND;
return 0;
case 1:
return -EBUSY;
@@ -265,7 +273,7 @@ cio_halt(struct subchannel *sch)
return -ENODEV;
CIO_TRACE_EVENT (2, "haltIO");
- CIO_TRACE_EVENT (2, sch->dev.bus_id);
+ CIO_TRACE_EVENT(2, dev_name(&sch->dev));
/*
* Issue "Halt subchannel" and process condition code
@@ -277,7 +285,7 @@ cio_halt(struct subchannel *sch)
switch (ccode) {
case 0:
- sch->schib.scsw.actl |= SCSW_ACTL_HALT_PEND;
+ sch->schib.scsw.cmd.actl |= SCSW_ACTL_HALT_PEND;
return 0;
case 1: /* status pending */
case 2: /* busy */
@@ -300,7 +308,7 @@ cio_clear(struct subchannel *sch)
return -ENODEV;
CIO_TRACE_EVENT (2, "clearIO");
- CIO_TRACE_EVENT (2, sch->dev.bus_id);
+ CIO_TRACE_EVENT(2, dev_name(&sch->dev));
/*
* Issue "Clear subchannel" and process condition code
@@ -312,7 +320,7 @@ cio_clear(struct subchannel *sch)
switch (ccode) {
case 0:
- sch->schib.scsw.actl |= SCSW_ACTL_CLEAR_PEND;
+ sch->schib.scsw.cmd.actl |= SCSW_ACTL_CLEAR_PEND;
return 0;
default: /* device not operational */
return -ENODEV;
@@ -336,7 +344,7 @@ cio_cancel (struct subchannel *sch)
return -ENODEV;
CIO_TRACE_EVENT (2, "cancelIO");
- CIO_TRACE_EVENT (2, sch->dev.bus_id);
+ CIO_TRACE_EVENT(2, dev_name(&sch->dev));
ccode = xsch (sch->schid);
@@ -387,8 +395,10 @@ cio_modify (struct subchannel *sch)
return ret;
}
-/*
- * Enable subchannel.
+/**
+ * cio_enable_subchannel - enable a subchannel.
+ * @sch: subchannel to be enabled
+ * @intparm: interruption parameter to set
*/
int cio_enable_subchannel(struct subchannel *sch, u32 intparm)
{
@@ -398,7 +408,7 @@ int cio_enable_subchannel(struct subchannel *sch, u32 intparm)
int ret;
CIO_TRACE_EVENT (2, "ensch");
- CIO_TRACE_EVENT (2, sch->dev.bus_id);
+ CIO_TRACE_EVENT(2, dev_name(&sch->dev));
if (sch_is_pseudo_sch(sch))
return -EINVAL;
@@ -434,12 +444,13 @@ int cio_enable_subchannel(struct subchannel *sch, u32 intparm)
CIO_TRACE_EVENT (2, dbf_txt);
return ret;
}
+EXPORT_SYMBOL_GPL(cio_enable_subchannel);
-/*
- * Disable subchannel.
+/**
+ * cio_disable_subchannel - disable a subchannel.
+ * @sch: subchannel to disable
*/
-int
-cio_disable_subchannel (struct subchannel *sch)
+int cio_disable_subchannel(struct subchannel *sch)
{
char dbf_txt[15];
int ccode;
@@ -447,7 +458,7 @@ cio_disable_subchannel (struct subchannel *sch)
int ret;
CIO_TRACE_EVENT (2, "dissch");
- CIO_TRACE_EVENT (2, sch->dev.bus_id);
+ CIO_TRACE_EVENT(2, dev_name(&sch->dev));
if (sch_is_pseudo_sch(sch))
return 0;
@@ -455,7 +466,7 @@ cio_disable_subchannel (struct subchannel *sch)
if (ccode == 3) /* Not operational. */
return -ENODEV;
- if (sch->schib.scsw.actl != 0)
+ if (scsw_actl(&sch->schib.scsw) != 0)
/*
* the disable function must not be called while there are
* requests pending for completion !
@@ -484,6 +495,7 @@ cio_disable_subchannel (struct subchannel *sch)
CIO_TRACE_EVENT (2, dbf_txt);
return ret;
}
+EXPORT_SYMBOL_GPL(cio_disable_subchannel);
int cio_create_sch_lock(struct subchannel *sch)
{
@@ -494,27 +506,61 @@ int cio_create_sch_lock(struct subchannel *sch)
return 0;
}
-/*
- * cio_validate_subchannel()
+static int cio_check_devno_blacklisted(struct subchannel *sch)
+{
+ if (is_blacklisted(sch->schid.ssid, sch->schib.pmcw.dev)) {
+ /*
+ * This device must not be known to Linux. So we simply
+ * say that there is no device and return ENODEV.
+ */
+ CIO_MSG_EVENT(6, "Blacklisted device detected "
+ "at devno %04X, subchannel set %x\n",
+ sch->schib.pmcw.dev, sch->schid.ssid);
+ return -ENODEV;
+ }
+ return 0;
+}
+
+static int cio_validate_io_subchannel(struct subchannel *sch)
+{
+ /* Initialization for io subchannels. */
+ if (!css_sch_is_valid(&sch->schib))
+ return -ENODEV;
+
+ /* Devno is valid. */
+ return cio_check_devno_blacklisted(sch);
+}
+
+static int cio_validate_msg_subchannel(struct subchannel *sch)
+{
+ /* Initialization for message subchannels. */
+ if (!css_sch_is_valid(&sch->schib))
+ return -ENODEV;
+
+ /* Devno is valid. */
+ return cio_check_devno_blacklisted(sch);
+}
+
+/**
+ * cio_validate_subchannel - basic validation of subchannel
+ * @sch: subchannel structure to be filled out
+ * @schid: subchannel id
*
* Find out subchannel type and initialize struct subchannel.
* Return codes:
- * SUBCHANNEL_TYPE_IO for a normal io subchannel
- * SUBCHANNEL_TYPE_CHSC for a chsc subchannel
- * SUBCHANNEL_TYPE_MESSAGE for a messaging subchannel
- * SUBCHANNEL_TYPE_ADM for a adm(?) subchannel
+ * 0 on success
* -ENXIO for non-defined subchannels
- * -ENODEV for subchannels with invalid device number or blacklisted devices
+ * -ENODEV for invalid subchannels or blacklisted devices
+ * -EIO for subchannels in an invalid subchannel set
*/
-int
-cio_validate_subchannel (struct subchannel *sch, struct subchannel_id schid)
+int cio_validate_subchannel(struct subchannel *sch, struct subchannel_id schid)
{
char dbf_txt[15];
int ccode;
int err;
- sprintf (dbf_txt, "valsch%x", schid.sch_no);
- CIO_TRACE_EVENT (4, dbf_txt);
+ sprintf(dbf_txt, "valsch%x", schid.sch_no);
+ CIO_TRACE_EVENT(4, dbf_txt);
/* Nuke all fields. */
memset(sch, 0, sizeof(struct subchannel));
@@ -529,8 +575,10 @@ cio_validate_subchannel (struct subchannel *sch, struct subchannel_id schid)
}
mutex_init(&sch->reg_mutex);
/* Set a name for the subchannel */
- snprintf (sch->dev.bus_id, BUS_ID_SIZE, "0.%x.%04x", schid.ssid,
- schid.sch_no);
+ if (cio_is_console(schid))
+ sch->dev.init_name = cio_get_console_sch_name(schid);
+ else
+ dev_set_name(&sch->dev, "0.%x.%04x", schid.ssid, schid.sch_no);
/*
* The first subchannel that is not-operational (ccode==3)
@@ -546,67 +594,21 @@ cio_validate_subchannel (struct subchannel *sch, struct subchannel_id schid)
/* Copy subchannel type from path management control word. */
sch->st = sch->schib.pmcw.st;
- /*
- * ... just being curious we check for non I/O subchannels
- */
- if (sch->st != 0) {
- CIO_MSG_EVENT(4, "Subchannel 0.%x.%04x reports "
- "non-I/O subchannel type %04X\n",
- sch->schid.ssid, sch->schid.sch_no, sch->st);
- /* We stop here for non-io subchannels. */
- err = sch->st;
- goto out;
- }
-
- /* Initialization for io subchannels. */
- if (!css_sch_is_valid(&sch->schib)) {
- err = -ENODEV;
- goto out;
+ switch (sch->st) {
+ case SUBCHANNEL_TYPE_IO:
+ err = cio_validate_io_subchannel(sch);
+ break;
+ case SUBCHANNEL_TYPE_MSG:
+ err = cio_validate_msg_subchannel(sch);
+ break;
+ default:
+ err = 0;
}
-
- /* Devno is valid. */
- if (is_blacklisted (sch->schid.ssid, sch->schib.pmcw.dev)) {
- /*
- * This device must not be known to Linux. So we simply
- * say that there is no device and return ENODEV.
- */
- CIO_MSG_EVENT(6, "Blacklisted device detected "
- "at devno %04X, subchannel set %x\n",
- sch->schib.pmcw.dev, sch->schid.ssid);
- err = -ENODEV;
+ if (err)
goto out;
- }
- if (cio_is_console(sch->schid)) {
- sch->opm = 0xff;
- sch->isc = 1;
- } else {
- sch->opm = chp_get_sch_opm(sch);
- sch->isc = 3;
- }
- sch->lpm = sch->schib.pmcw.pam & sch->opm;
-
- CIO_MSG_EVENT(6, "Detected device %04x on subchannel 0.%x.%04X "
- "- PIM = %02X, PAM = %02X, POM = %02X\n",
- sch->schib.pmcw.dev, sch->schid.ssid,
- sch->schid.sch_no, sch->schib.pmcw.pim,
- sch->schib.pmcw.pam, sch->schib.pmcw.pom);
- /*
- * We now have to initially ...
- * ... enable "concurrent sense"
- * ... enable "multipath mode" if more than one
- * CHPID is available. This is done regardless
- * whether multiple paths are available for us.
- */
- sch->schib.pmcw.csense = 1; /* concurrent sense */
- sch->schib.pmcw.ena = 0;
- if ((sch->lpm & (sch->lpm - 1)) != 0)
- sch->schib.pmcw.mp = 1; /* multipath mode */
- /* clean up possible residual cmf stuff */
- sch->schib.pmcw.mme = 0;
- sch->schib.pmcw.mbfc = 0;
- sch->schib.pmcw.mbi = 0;
- sch->schib.mba = 0;
+ CIO_MSG_EVENT(4, "Subchannel 0.%x.%04x reports subchannel type %04X\n",
+ sch->schid.ssid, sch->schid.sch_no, sch->st);
return 0;
out:
if (!cio_is_console(schid))
@@ -647,7 +649,7 @@ do_IRQ (struct pt_regs *regs)
*/
if (tpi_info->adapter_IO == 1 &&
tpi_info->int_type == IO_INTERRUPT_TYPE) {
- do_adapter_IO();
+ do_adapter_IO(tpi_info->isc);
continue;
}
sch = (struct subchannel *)(unsigned long)tpi_info->intparm;
@@ -681,6 +683,7 @@ do_IRQ (struct pt_regs *regs)
#ifdef CONFIG_CCW_CONSOLE
static struct subchannel console_subchannel;
+static char console_sch_name[10] = "0.x.xxxx";
static struct io_subchannel_private console_priv;
static int console_subchannel_in_use;
@@ -706,9 +709,9 @@ void wait_cons_dev(void)
if (!console_subchannel_in_use)
return;
- /* disable all but isc 1 (console device) */
+ /* disable all but the console isc */
__ctl_store (save_cr6, 6, 6);
- cr6 = 0x40000000;
+ cr6 = 1UL << (31 - CONSOLE_ISC);
__ctl_load (cr6, 6, 6);
do {
@@ -716,7 +719,7 @@ void wait_cons_dev(void)
if (!cio_tpi())
cpu_relax();
spin_lock(console_subchannel.lock);
- } while (console_subchannel.schib.scsw.actl != 0);
+ } while (console_subchannel.schib.scsw.cmd.actl != 0);
/*
* restore previous isc value
*/
@@ -761,7 +764,6 @@ cio_get_console_sch_no(void)
/* unlike in 2.4, we cannot autoprobe here, since
* the channel subsystem is not fully initialized.
* With some luck, the HWC console can take over */
- printk(KERN_WARNING "cio: No ccw console found!\n");
return -1;
}
return console_irq;
@@ -778,6 +780,7 @@ cio_probe_console(void)
sch_no = cio_get_console_sch_no();
if (sch_no == -1) {
console_subchannel_in_use = 0;
+ printk(KERN_WARNING "cio: No ccw console found!\n");
return ERR_PTR(-ENODEV);
}
memset(&console_subchannel, 0, sizeof(struct subchannel));
@@ -790,15 +793,15 @@ cio_probe_console(void)
}
/*
- * enable console I/O-interrupt subclass 1
+ * enable console I/O-interrupt subclass
*/
- ctl_set_bit(6, 30);
- console_subchannel.isc = 1;
- console_subchannel.schib.pmcw.isc = 1;
+ isc_register(CONSOLE_ISC);
+ console_subchannel.schib.pmcw.isc = CONSOLE_ISC;
console_subchannel.schib.pmcw.intparm =
(u32)(addr_t)&console_subchannel;
ret = cio_modify(&console_subchannel);
if (ret) {
+ isc_unregister(CONSOLE_ISC);
console_subchannel_in_use = 0;
return ERR_PTR(ret);
}
@@ -810,7 +813,7 @@ cio_release_console(void)
{
console_subchannel.schib.pmcw.intparm = 0;
cio_modify(&console_subchannel);
- ctl_clear_bit(6, 24);
+ isc_unregister(CONSOLE_ISC);
console_subchannel_in_use = 0;
}
@@ -831,6 +834,12 @@ cio_get_console_subchannel(void)
return &console_subchannel;
}
+const char *cio_get_console_sch_name(struct subchannel_id schid)
+{
+ snprintf(console_sch_name, 10, "0.%x.%04x", schid.ssid, schid.sch_no);
+ return (const char *)console_sch_name;
+}
+
#endif
static int
__disable_subchannel_easy(struct subchannel_id schid, struct schib *schib)
@@ -850,21 +859,8 @@ __disable_subchannel_easy(struct subchannel_id schid, struct schib *schib)
return -EBUSY; /* uhm... */
}
-/* we can't use the normal udelay here, since it enables external interrupts */
-
-static void udelay_reset(unsigned long usecs)
-{
- uint64_t start_cc, end_cc;
-
- asm volatile ("STCK %0" : "=m" (start_cc));
- do {
- cpu_relax();
- asm volatile ("STCK %0" : "=m" (end_cc));
- } while (((end_cc - start_cc)/4096) < usecs);
-}
-
static int
-__clear_subchannel_easy(struct subchannel_id schid)
+__clear_io_subchannel_easy(struct subchannel_id schid)
{
int retry;
@@ -878,11 +874,17 @@ __clear_subchannel_easy(struct subchannel_id schid)
if (schid_equal(&ti.schid, &schid))
return 0;
}
- udelay_reset(100);
+ udelay_simple(100);
}
return -EBUSY;
}
+static void __clear_chsc_subchannel_easy(void)
+{
+ /* It seems we can only wait for a bit here :/ */
+ udelay_simple(100);
+}
+
static int pgm_check_occured;
static void cio_reset_pgm_check_handler(void)
@@ -890,7 +892,7 @@ static void cio_reset_pgm_check_handler(void)
pgm_check_occured = 1;
}
-static int stsch_reset(struct subchannel_id schid, volatile struct schib *addr)
+static int stsch_reset(struct subchannel_id schid, struct schib *addr)
{
int rc;
@@ -921,11 +923,22 @@ static int __shutdown_subchannel_easy(struct subchannel_id schid, void *data)
case -ENODEV:
break;
default: /* -EBUSY */
- if (__clear_subchannel_easy(schid))
- break; /* give up... */
+ switch (schib.pmcw.st) {
+ case SUBCHANNEL_TYPE_IO:
+ if (__clear_io_subchannel_easy(schid))
+ goto out; /* give up... */
+ break;
+ case SUBCHANNEL_TYPE_CHSC:
+ __clear_chsc_subchannel_easy();
+ break;
+ default:
+ /* No default clear strategy */
+ break;
+ }
stsch(schid, &schib);
__disable_subchannel_easy(schid, &schib);
}
+out:
return 0;
}
@@ -1068,3 +1081,61 @@ int __init cio_get_iplinfo(struct cio_iplinfo *iplinfo)
iplinfo->is_qdio = schib.pmcw.qf;
return 0;
}
+
+/**
+ * cio_tm_start_key - perform start function
+ * @sch: subchannel on which to perform the start function
+ * @tcw: transport-command word to be started
+ * @lpm: mask of paths to use
+ * @key: storage key to use for storage access
+ *
+ * Start the tcw on the given subchannel. Return zero on success, non-zero
+ * otherwise.
+ */
+int cio_tm_start_key(struct subchannel *sch, struct tcw *tcw, u8 lpm, u8 key)
+{
+ int cc;
+ union orb *orb = &to_io_private(sch)->orb;
+
+ memset(orb, 0, sizeof(union orb));
+ orb->tm.intparm = (u32) (addr_t) sch;
+ orb->tm.key = key >> 4;
+ orb->tm.b = 1;
+ orb->tm.lpm = lpm ? lpm : sch->lpm;
+ orb->tm.tcw = (u32) (addr_t) tcw;
+ cc = ssch(sch->schid, orb);
+ switch (cc) {
+ case 0:
+ return 0;
+ case 1:
+ case 2:
+ return -EBUSY;
+ default:
+ return cio_start_handle_notoper(sch, lpm);
+ }
+}
+
+/**
+ * cio_tm_intrg - perform interrogate function
+ * @sch - subchannel on which to perform the interrogate function
+ *
+ * If the specified subchannel is running in transport-mode, perform the
+ * interrogate function. Return zero on success, non-zero otherwie.
+ */
+int cio_tm_intrg(struct subchannel *sch)
+{
+ int cc;
+
+ if (!to_io_private(sch)->orb.tm.b)
+ return -EINVAL;
+ cc = xsch(sch->schid);
+ switch (cc) {
+ case 0:
+ case 2:
+ return 0;
+ case 1:
+ return -EBUSY;
+ default:
+ return -ENODEV;
+ }
+}
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-12-03 12:39:11 +0000