* drivers/s390/cio/cio.c
* S/390 common I/O routines -- low level i/o calls
*
- * Copyright (C) 1999-2002 IBM Deutschland Entwicklung GmbH,
- * IBM Corporation
+ * Copyright (C) IBM Corp. 1999,2006
* Author(s): Ingo Adlung (adlung@de.ibm.com)
* Cornelia Huck (cornelia.huck@de.ibm.com)
* Arnd Bergmann (arndb@de.ibm.com)
#include <asm/cio.h>
#include <asm/delay.h>
#include <asm/irq.h>
+#include <asm/irq_regs.h>
#include <asm/setup.h>
+#include <asm/reset.h>
#include "airq.h"
#include "cio.h"
#include "css.h"
#include "ioasm.h"
#include "blacklist.h"
#include "cio_debug.h"
+#include "../s390mach.h"
debug_info_t *cio_debug_msg_id;
debug_info_t *cio_debug_trace_id;
return 1;
local_bh_disable();
irq_enter ();
- spin_lock(&sch->lock);
+ spin_lock(sch->lock);
memcpy (&sch->schib.scsw, &irb->scsw, sizeof (struct scsw));
if (sch->driver && sch->driver->irq)
sch->driver->irq(&sch->dev);
- spin_unlock(&sch->lock);
+ spin_unlock(sch->lock);
irq_exit ();
_local_bh_enable();
return 1;
CIO_TRACE_EVENT (2, "ensch");
CIO_TRACE_EVENT (2, sch->dev.bus_id);
+ if (sch_is_pseudo_sch(sch))
+ return -EINVAL;
ccode = stsch (sch->schid, &sch->schib);
if (ccode)
return -ENODEV;
CIO_TRACE_EVENT (2, "dissch");
CIO_TRACE_EVENT (2, sch->dev.bus_id);
+ if (sch_is_pseudo_sch(sch))
+ return 0;
ccode = stsch (sch->schid, &sch->schib);
if (ccode == 3) /* Not operational. */
return -ENODEV;
return ret;
}
+int cio_create_sch_lock(struct subchannel *sch)
+{
+ sch->lock = kmalloc(sizeof(spinlock_t), GFP_KERNEL);
+ if (!sch->lock)
+ return -ENOMEM;
+ spin_lock_init(sch->lock);
+ return 0;
+}
+
/*
* cio_validate_subchannel()
*
{
char dbf_txt[15];
int ccode;
+ int err;
sprintf (dbf_txt, "valsch%x", schid.sch_no);
CIO_TRACE_EVENT (4, dbf_txt);
/* Nuke all fields. */
memset(sch, 0, sizeof(struct subchannel));
- spin_lock_init(&sch->lock);
+ sch->schid = schid;
+ if (cio_is_console(schid)) {
+ sch->lock = cio_get_console_lock();
+ } else {
+ err = cio_create_sch_lock(sch);
+ if (err)
+ goto out;
+ }
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);
* is not valid.
*/
ccode = stsch_err (schid, &sch->schib);
- if (ccode)
- return (ccode == 3) ? -ENXIO : ccode;
-
- sch->schid = schid;
+ if (ccode) {
+ err = (ccode == 3) ? -ENXIO : ccode;
+ goto out;
+ }
/* Copy subchannel type from path management control word. */
sch->st = sch->schib.pmcw.st;
"non-I/O subchannel type %04X\n",
sch->schid.ssid, sch->schid.sch_no, sch->st);
/* We stop here for non-io subchannels. */
- return sch->st;
+ err = sch->st;
+ goto out;
}
/* Initialization for io subchannels. */
- if (!sch->schib.pmcw.dnv)
+ if (!sch->schib.pmcw.dnv) {
/* io subchannel but device number is invalid. */
- return -ENODEV;
-
+ err = -ENODEV;
+ goto out;
+ }
/* Devno is valid. */
if (is_blacklisted (sch->schid.ssid, sch->schib.pmcw.dev)) {
/*
CIO_MSG_EVENT(0, "Blacklisted device detected "
"at devno %04X, subchannel set %x\n",
sch->schib.pmcw.dev, sch->schid.ssid);
- return -ENODEV;
+ err = -ENODEV;
+ goto out;
}
sch->opm = 0xff;
if (!cio_is_console(sch->schid))
if ((sch->lpm & (sch->lpm - 1)) != 0)
sch->schib.pmcw.mp = 1; /* multipath mode */
return 0;
+out:
+ if (!cio_is_console(schid))
+ kfree(sch->lock);
+ sch->lock = NULL;
+ return err;
}
/*
struct tpi_info *tpi_info;
struct subchannel *sch;
struct irb *irb;
+ struct pt_regs *old_regs;
- irq_enter ();
+ old_regs = set_irq_regs(regs);
+ irq_enter();
asm volatile ("mc 0,0");
if (S390_lowcore.int_clock >= S390_lowcore.jiffy_timer)
/**
* Make sure that the i/o interrupt did not "overtake"
* the last HZ timer interrupt.
*/
- account_ticks(regs);
+ account_ticks();
/*
* Get interrupt information from lowcore
*/
}
sch = (struct subchannel *)(unsigned long)tpi_info->intparm;
if (sch)
- spin_lock(&sch->lock);
+ spin_lock(sch->lock);
/* Store interrupt response block to lowcore. */
if (tsch (tpi_info->schid, irb) == 0 && sch) {
/* Keep subchannel information word up to date. */
sch->driver->irq(&sch->dev);
}
if (sch)
- spin_unlock(&sch->lock);
+ spin_unlock(sch->lock);
/*
* Are more interrupts pending?
* If so, the tpi instruction will update the lowcore
* out of the sie which costs more cycles than it saves.
*/
} while (!MACHINE_IS_VM && tpi (NULL) != 0);
- irq_exit ();
+ irq_exit();
+ set_irq_regs(old_regs);
}
#ifdef CONFIG_CCW_CONSOLE
__ctl_load (cr6, 6, 6);
do {
- spin_unlock(&console_subchannel.lock);
+ spin_unlock(console_subchannel.lock);
if (!cio_tpi())
cpu_relax();
- spin_lock(&console_subchannel.lock);
+ spin_lock(console_subchannel.lock);
} while (console_subchannel.schib.scsw.actl != 0);
/*
* restore previous isc value
return -EBUSY;
}
-struct sch_match_id {
- struct subchannel_id schid;
- struct ccw_dev_id devid;
+static int pgm_check_occured;
+
+static void cio_reset_pgm_check_handler(void)
+{
+ pgm_check_occured = 1;
+}
+
+static int stsch_reset(struct subchannel_id schid, volatile struct schib *addr)
+{
int rc;
-};
-static int __shutdown_subchannel_easy_and_match(struct subchannel_id schid,
- void *data)
+ pgm_check_occured = 0;
+ s390_reset_pgm_handler = cio_reset_pgm_check_handler;
+ rc = stsch(schid, addr);
+ s390_reset_pgm_handler = NULL;
+
+ /* The program check handler could have changed pgm_check_occured */
+ barrier();
+
+ if (pgm_check_occured)
+ return -EIO;
+ else
+ return rc;
+}
+
+static int __shutdown_subchannel_easy(struct subchannel_id schid, void *data)
{
struct schib schib;
- struct sch_match_id *match_id = data;
- if (stsch_err(schid, &schib))
+ if (stsch_reset(schid, &schib))
return -ENXIO;
- if (match_id && schib.pmcw.dnv &&
- (schib.pmcw.dev == match_id->devid.devno) &&
- (schid.ssid == match_id->devid.ssid)) {
- match_id->schid = schid;
- match_id->rc = 0;
- }
if (!schib.pmcw.ena)
return 0;
switch(__disable_subchannel_easy(schid, &schib)) {
return 0;
}
-static int clear_all_subchannels_and_match(struct ccw_dev_id *devid,
- struct subchannel_id *schid)
+static atomic_t chpid_reset_count;
+
+static void s390_reset_chpids_mcck_handler(void)
+{
+ struct crw crw;
+ struct mci *mci;
+
+ /* Check for pending channel report word. */
+ mci = (struct mci *)&S390_lowcore.mcck_interruption_code;
+ if (!mci->cp)
+ return;
+ /* Process channel report words. */
+ while (stcrw(&crw) == 0) {
+ /* Check for responses to RCHP. */
+ if (crw.slct && crw.rsc == CRW_RSC_CPATH)
+ atomic_dec(&chpid_reset_count);
+ }
+}
+
+#define RCHP_TIMEOUT (30 * USEC_PER_SEC)
+static void css_reset(void)
+{
+ int i, ret;
+ unsigned long long timeout;
+
+ /* Reset subchannels. */
+ for_each_subchannel(__shutdown_subchannel_easy, NULL);
+ /* Reset channel paths. */
+ s390_reset_mcck_handler = s390_reset_chpids_mcck_handler;
+ /* Enable channel report machine checks. */
+ __ctl_set_bit(14, 28);
+ /* Temporarily reenable machine checks. */
+ local_mcck_enable();
+ for (i = 0; i <= __MAX_CHPID; i++) {
+ ret = rchp(i);
+ if ((ret == 0) || (ret == 2))
+ /*
+ * rchp either succeeded, or another rchp is already
+ * in progress. In either case, we'll get a crw.
+ */
+ atomic_inc(&chpid_reset_count);
+ }
+ /* Wait for machine check for all channel paths. */
+ timeout = get_clock() + (RCHP_TIMEOUT << 12);
+ while (atomic_read(&chpid_reset_count) != 0) {
+ if (get_clock() > timeout)
+ break;
+ cpu_relax();
+ }
+ /* Disable machine checks again. */
+ local_mcck_disable();
+ /* Disable channel report machine checks. */
+ __ctl_clear_bit(14, 28);
+ s390_reset_mcck_handler = NULL;
+}
+
+static struct reset_call css_reset_call = {
+ .fn = css_reset,
+};
+
+static int __init init_css_reset_call(void)
+{
+ atomic_set(&chpid_reset_count, 0);
+ register_reset_call(&css_reset_call);
+ return 0;
+}
+
+arch_initcall(init_css_reset_call);
+
+struct sch_match_id {
+ struct subchannel_id schid;
+ struct ccw_dev_id devid;
+ int rc;
+};
+
+static int __reipl_subchannel_match(struct subchannel_id schid, void *data)
+{
+ struct schib schib;
+ struct sch_match_id *match_id = data;
+
+ if (stsch_reset(schid, &schib))
+ return -ENXIO;
+ if (schib.pmcw.dnv &&
+ (schib.pmcw.dev == match_id->devid.devno) &&
+ (schid.ssid == match_id->devid.ssid)) {
+ match_id->schid = schid;
+ match_id->rc = 0;
+ return 1;
+ }
+ return 0;
+}
+
+static int reipl_find_schid(struct ccw_dev_id *devid,
+ struct subchannel_id *schid)
{
struct sch_match_id match_id;
match_id.devid = *devid;
match_id.rc = -ENODEV;
- local_irq_disable();
- for_each_subchannel(__shutdown_subchannel_easy_and_match, &match_id);
+ for_each_subchannel(__reipl_subchannel_match, &match_id);
if (match_id.rc == 0)
*schid = match_id.schid;
return match_id.rc;
}
-
-void clear_all_subchannels(void)
-{
- local_irq_disable();
- for_each_subchannel(__shutdown_subchannel_easy_and_match, NULL);
-}
-
extern void do_reipl_asm(__u32 schid);
/* Make sure all subchannels are quiet before we re-ipl an lpar. */
{
struct subchannel_id schid;
- if (clear_all_subchannels_and_match(devid, &schid))
+ s390_reset_system();
+ if (reipl_find_schid(devid, &schid) != 0)
panic("IPL Device not found\n");
- cio_reset_channel_paths();
do_reipl_asm(*((__u32*)&schid));
}
git.openpandora.org / pandora-kernel.git / blobdiff