/*
* drivers/s390/cio/cio.c
* S/390 common I/O routines -- low level i/o calls
- * $Revision: 1.121 $
*
- * 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 (cohuck@de.ibm.com)
+ * Cornelia Huck (cornelia.huck@de.ibm.com)
* Arnd Bergmann (arndb@de.ibm.com)
* Martin Schwidefsky (schwidefsky@de.ibm.com)
*/
#include <linux/module.h>
-#include <linux/config.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/device.h>
#include <linux/kernel_stat.h>
-
-#include <asm/hardirq.h>
+#include <linux/interrupt.h>
#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;
static int __init
cio_debug_init (void)
{
- cio_debug_msg_id = debug_register ("cio_msg", 4, 4, 16*sizeof (long));
+ cio_debug_msg_id = debug_register ("cio_msg", 16, 4, 16*sizeof (long));
if (!cio_debug_msg_id)
goto out_unregister;
debug_register_view (cio_debug_msg_id, &debug_sprintf_view);
- debug_set_level (cio_debug_msg_id, 6);
- cio_debug_trace_id = debug_register ("cio_trace", 4, 4, 8);
+ debug_set_level (cio_debug_msg_id, 2);
+ cio_debug_trace_id = debug_register ("cio_trace", 16, 4, 16);
if (!cio_debug_trace_id)
goto out_unregister;
debug_register_view (cio_debug_trace_id, &debug_hex_ascii_view);
- debug_set_level (cio_debug_trace_id, 6);
- cio_debug_crw_id = debug_register ("cio_crw", 2, 4, 16*sizeof (long));
+ debug_set_level (cio_debug_trace_id, 2);
+ cio_debug_crw_id = debug_register ("cio_crw", 4, 4, 16*sizeof (long));
if (!cio_debug_crw_id)
goto out_unregister;
debug_register_view (cio_debug_crw_id, &debug_sprintf_view);
- debug_set_level (cio_debug_crw_id, 6);
+ debug_set_level (cio_debug_crw_id, 2);
pr_debug("debugging initialized\n");
return 0;
return 0;
irb = (struct irb *) __LC_IRB;
/* Store interrupt response block to lowcore. */
- if (tsch (tpi_info->irq, irb) != 0)
+ if (tsch (tpi_info->schid, irb) != 0)
/* Not status pending or not operational. */
return 1;
sch = (struct subchannel *)(unsigned long)tpi_info->intparm;
if (!sch)
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;
}
else
sch->lpm = 0;
- stsch (sch->irq, &sch->schib);
+ stsch (sch->schid, &sch->schib);
CIO_MSG_EVENT(0, "cio_start: 'not oper' status for "
- "subchannel %04x!\n", sch->irq);
+ "subchannel 0.%x.%04x!\n", sch->schid.ssid,
+ sch->schid.sch_no);
sprintf(dbf_text, "no%s", sch->dev.bus_id);
CIO_TRACE_EVENT(0, dbf_text);
CIO_HEX_EVENT(0, &sch->schib, sizeof (struct schib));
}
int
-cio_start (struct subchannel *sch, /* subchannel structure */
- struct ccw1 * cpa, /* logical channel prog addr */
- __u8 lpm) /* logical path mask */
+cio_start_key (struct subchannel *sch, /* subchannel structure */
+ struct ccw1 * cpa, /* logical channel prog addr */
+ __u8 lpm, /* logical path mask */
+ __u8 key) /* storage key */
{
char dbf_txt[15];
int ccode;
sch->orb.pfch = sch->options.prefetch == 0;
sch->orb.spnd = sch->options.suspend;
sch->orb.ssic = sch->options.suspend && sch->options.inter;
- sch->orb.lpm = (lpm != 0) ? (lpm & sch->opm) : sch->lpm;
-#ifdef CONFIG_ARCH_S390X
+ sch->orb.lpm = (lpm != 0) ? lpm : sch->lpm;
+#ifdef CONFIG_64BIT
/*
* for 64 bit we always support 64 bit IDAWs with 4k page size only
*/
sch->orb.c64 = 1;
sch->orb.i2k = 0;
#endif
+ sch->orb.key = key >> 4;
+ /* issue "Start Subchannel" */
sch->orb.cpa = (__u32) __pa (cpa);
+ ccode = ssch (sch->schid, &sch->orb);
- /*
- * Issue "Start subchannel" and process condition code
- */
- ccode = ssch (sch->irq, &sch->orb);
+ /* process condition code */
sprintf (dbf_txt, "ccode:%d", ccode);
CIO_TRACE_EVENT (4, dbf_txt);
}
}
+int
+cio_start (struct subchannel *sch, struct ccw1 *cpa, __u8 lpm)
+{
+ return cio_start_key(sch, cpa, lpm, PAGE_DEFAULT_KEY);
+}
+
/*
* resume suspended I/O operation
*/
CIO_TRACE_EVENT (4, "resIO");
CIO_TRACE_EVENT (4, sch->dev.bus_id);
- ccode = rsch (sch->irq);
+ ccode = rsch (sch->schid);
sprintf (dbf_txt, "ccode:%d", ccode);
CIO_TRACE_EVENT (4, dbf_txt);
/*
* Issue "Halt subchannel" and process condition code
*/
- ccode = hsch (sch->irq);
+ ccode = hsch (sch->schid);
sprintf (dbf_txt, "ccode:%d", ccode);
CIO_TRACE_EVENT (2, dbf_txt);
/*
* Issue "Clear subchannel" and process condition code
*/
- ccode = csch (sch->irq);
+ ccode = csch (sch->schid);
sprintf (dbf_txt, "ccode:%d", ccode);
CIO_TRACE_EVENT (2, dbf_txt);
CIO_TRACE_EVENT (2, "cancelIO");
CIO_TRACE_EVENT (2, sch->dev.bus_id);
- ccode = xsch (sch->irq);
+ ccode = xsch (sch->schid);
sprintf (dbf_txt, "ccode:%d", ccode);
CIO_TRACE_EVENT (2, dbf_txt);
switch (ccode) {
case 0: /* success */
/* Update information in scsw. */
- stsch (sch->irq, &sch->schib);
+ stsch (sch->schid, &sch->schib);
return 0;
case 1: /* status pending */
return -EBUSY;
ret = 0;
for (retry = 0; retry < 5; retry++) {
- ccode = msch_err (sch->irq, &sch->schib);
+ ccode = msch_err (sch->schid, &sch->schib);
if (ccode < 0) /* -EIO if msch gets a program check. */
return ccode;
switch (ccode) {
CIO_TRACE_EVENT (2, "ensch");
CIO_TRACE_EVENT (2, sch->dev.bus_id);
- ccode = stsch (sch->irq, &sch->schib);
+ if (sch_is_pseudo_sch(sch))
+ return -EINVAL;
+ ccode = stsch (sch->schid, &sch->schib);
if (ccode)
return -ENODEV;
- sch->schib.pmcw.ena = 1;
- sch->schib.pmcw.isc = isc;
- sch->schib.pmcw.intparm = (__u32)(unsigned long)sch;
for (retry = 5, ret = 0; retry > 0; retry--) {
+ sch->schib.pmcw.ena = 1;
+ sch->schib.pmcw.isc = isc;
+ sch->schib.pmcw.intparm = (__u32)(unsigned long)sch;
ret = cio_modify(sch);
if (ret == -ENODEV)
break;
*/
sch->schib.pmcw.csense = 0;
if (ret == 0) {
- stsch (sch->irq, &sch->schib);
+ stsch (sch->schid, &sch->schib);
if (sch->schib.pmcw.ena)
break;
}
if (ret == -EBUSY) {
struct irb irb;
- if (tsch(sch->irq, &irb) != 0)
+ if (tsch(sch->schid, &irb) != 0)
break;
}
}
CIO_TRACE_EVENT (2, "dissch");
CIO_TRACE_EVENT (2, sch->dev.bus_id);
- ccode = stsch (sch->irq, &sch->schib);
+ if (sch_is_pseudo_sch(sch))
+ return 0;
+ ccode = stsch (sch->schid, &sch->schib);
if (ccode == 3) /* Not operational. */
return -ENODEV;
*/
return -EBUSY;
-
- sch->schib.pmcw.ena = 0;
for (retry = 5, ret = 0; retry > 0; retry--) {
+ sch->schib.pmcw.ena = 0;
ret = cio_modify(sch);
if (ret == -ENODEV)
break;
*/
break;
if (ret == 0) {
- stsch (sch->irq, &sch->schib);
+ stsch (sch->schid, &sch->schib);
if (!sch->schib.pmcw.ena)
break;
}
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()
*
* -ENODEV for subchannels with invalid device number or blacklisted devices
*/
int
-cio_validate_subchannel (struct subchannel *sch, unsigned int irq)
+cio_validate_subchannel (struct subchannel *sch, struct subchannel_id schid)
{
char dbf_txt[15];
int ccode;
+ int err;
- sprintf (dbf_txt, "valsch%x", irq);
+ 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, "0.0.%04x", irq);
+ snprintf (sch->dev.bus_id, BUS_ID_SIZE, "0.%x.%04x", schid.ssid,
+ schid.sch_no);
/*
* The first subchannel that is not-operational (ccode==3)
* indicates that there aren't any more devices available.
+ * If stsch gets an exception, it means the current subchannel set
+ * is not valid.
*/
- sch->irq = irq;
- ccode = stsch (irq, &sch->schib);
- if (ccode)
- return -ENXIO;
-
+ ccode = stsch_err (schid, &sch->schib);
+ if (ccode) {
+ err = (ccode == 3) ? -ENXIO : ccode;
+ goto out;
+ }
/* Copy subchannel type from path management control word. */
sch->st = sch->schib.pmcw.st;
*/
if (sch->st != 0) {
CIO_DEBUG(KERN_INFO, 0,
- "Subchannel %04X reports "
+ "Subchannel 0.%x.%04x reports "
"non-I/O subchannel type %04X\n",
- sch->irq, sch->st);
+ 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->schib.pmcw.dev)) {
+ 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(0, "Blacklisted device detected "
- "at devno %04X\n", sch->schib.pmcw.dev);
- return -ENODEV;
+ "at devno %04X, subchannel set %x\n",
+ sch->schib.pmcw.dev, sch->schid.ssid);
+ err = -ENODEV;
+ goto out;
}
sch->opm = 0xff;
- chsc_validate_chpids(sch);
- sch->lpm = sch->schib.pmcw.pim &
- sch->schib.pmcw.pam &
- sch->schib.pmcw.pom &
- sch->opm;
+ if (!cio_is_console(sch->schid))
+ chsc_validate_chpids(sch);
+ sch->lpm = sch->schib.pmcw.pam & sch->opm;
CIO_DEBUG(KERN_INFO, 0,
- "Detected device %04X on subchannel %04X"
+ "Detected device %04x on subchannel 0.%x.%04X"
" - PIM = %02X, PAM = %02X, POM = %02X\n",
- sch->schib.pmcw.dev, sch->irq, sch->schib.pmcw.pim,
+ sch->schib.pmcw.dev, sch->schid.ssid,
+ sch->schid.sch_no, sch->schib.pmcw.pim,
sch->schib.pmcw.pam, sch->schib.pmcw.pom);
/*
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)
- account_ticks(regs);
+ /**
+ * Make sure that the i/o interrupt did not "overtake"
+ * the last HZ timer interrupt.
+ */
+ 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->irq, irb) == 0 && sch) {
+ if (tsch (tpi_info->schid, irb) == 0 && sch) {
/* Keep subchannel information word up to date. */
memcpy (&sch->schib.scsw, &irb->scsw,
sizeof (irb->scsw));
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
}
static int
-cio_console_irq(void)
+cio_test_for_console(struct subchannel_id schid, void *data)
{
- int irq;
+ if (stsch_err(schid, &console_subchannel.schib) != 0)
+ return -ENXIO;
+ if (console_subchannel.schib.pmcw.dnv &&
+ console_subchannel.schib.pmcw.dev ==
+ console_devno) {
+ console_irq = schid.sch_no;
+ return 1; /* found */
+ }
+ return 0;
+}
+
+
+static int
+cio_get_console_sch_no(void)
+{
+ struct subchannel_id schid;
+ init_subchannel_id(&schid);
if (console_irq != -1) {
/* VM provided us with the irq number of the console. */
- if (stsch(console_irq, &console_subchannel.schib) != 0 ||
+ schid.sch_no = console_irq;
+ if (stsch(schid, &console_subchannel.schib) != 0 ||
!console_subchannel.schib.pmcw.dnv)
return -1;
- console_device = console_subchannel.schib.pmcw.dev;
- } else if (console_device != -1) {
+ console_devno = console_subchannel.schib.pmcw.dev;
+ } else if (console_devno != -1) {
/* At least the console device number is known. */
- for (irq = 0; irq < __MAX_SUBCHANNELS; irq++) {
- if (stsch(irq, &console_subchannel.schib) != 0)
- break;
- if (console_subchannel.schib.pmcw.dnv &&
- console_subchannel.schib.pmcw.dev ==
- console_device) {
- console_irq = irq;
- break;
- }
- }
+ for_each_subchannel(cio_test_for_console, NULL);
if (console_irq == -1)
return -1;
} else {
struct subchannel *
cio_probe_console(void)
{
- int irq, ret;
+ int sch_no, ret;
+ struct subchannel_id schid;
if (xchg(&console_subchannel_in_use, 1) != 0)
return ERR_PTR(-EBUSY);
- irq = cio_console_irq();
- if (irq == -1) {
+ sch_no = cio_get_console_sch_no();
+ if (sch_no == -1) {
console_subchannel_in_use = 0;
return ERR_PTR(-ENODEV);
}
memset(&console_subchannel, 0, sizeof(struct subchannel));
- ret = cio_validate_subchannel(&console_subchannel, irq);
+ init_subchannel_id(&schid);
+ schid.sch_no = sch_no;
+ ret = cio_validate_subchannel(&console_subchannel, schid);
if (ret) {
console_subchannel_in_use = 0;
return ERR_PTR(-ENODEV);
/* Bah... hack to catch console special sausages. */
int
-cio_is_console(int irq)
+cio_is_console(struct subchannel_id schid)
{
if (!console_subchannel_in_use)
return 0;
- return (irq == console_subchannel.irq);
+ return schid_equal(&schid, &console_subchannel.schid);
}
struct subchannel *
cio_get_console_subchannel(void)
{
if (!console_subchannel_in_use)
- return 0;
+ return NULL;
return &console_subchannel;
}
#endif
static inline int
-__disable_subchannel_easy(unsigned int schid, struct schib *schib)
+__disable_subchannel_easy(struct subchannel_id schid, struct schib *schib)
{
int retry, cc;
}
static inline int
-__clear_subchannel_easy(unsigned int schid)
+__clear_subchannel_easy(struct subchannel_id schid)
{
int retry;
struct tpi_info ti;
if (tpi(&ti)) {
- tsch(schid, (struct irb *)__LC_IRB);
- return 0;
+ tsch(ti.schid, (struct irb *)__LC_IRB);
+ if (schid_equal(&ti.schid, &schid))
+ return 0;
}
udelay(100);
}
return -EBUSY;
}
-extern void do_reipl(unsigned long devno);
-/* Make sure all subchannels are quiet before we re-ipl an lpar. */
-void
-reipl(unsigned long devno)
+static int pgm_check_occured;
+
+static void cio_reset_pgm_check_handler(void)
{
- unsigned int schid;
+ pgm_check_occured = 1;
+}
- local_irq_disable();
- for (schid=0;schid<=highest_subchannel;schid++) {
- struct schib schib;
- if (stsch(schid, &schib))
- goto out;
- if (!schib.pmcw.ena)
- continue;
- switch(__disable_subchannel_easy(schid, &schib)) {
- case 0:
- case -ENODEV:
+static int stsch_reset(struct subchannel_id schid, volatile struct schib *addr)
+{
+ int rc;
+
+ 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;
+
+ if (stsch_reset(schid, &schib))
+ return -ENXIO;
+ if (!schib.pmcw.ena)
+ return 0;
+ switch(__disable_subchannel_easy(schid, &schib)) {
+ case 0:
+ case -ENODEV:
+ break;
+ default: /* -EBUSY */
+ if (__clear_subchannel_easy(schid))
+ break; /* give up... */
+ stsch(schid, &schib);
+ __disable_subchannel_easy(schid, &schib);
+ }
+ return 0;
+}
+
+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;
- default: /* -EBUSY */
- if (__clear_subchannel_easy(schid))
- break; /* give up... */
- stsch(schid, &schib);
- __disable_subchannel_easy(schid, &schib);
- }
+ cpu_relax();
}
-out:
- do_reipl(devno);
+ /* 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;
+ for_each_subchannel(__reipl_subchannel_match, &match_id);
+ if (match_id.rc == 0)
+ *schid = match_id.schid;
+ return match_id.rc;
+}
+
+extern void do_reipl_asm(__u32 schid);
+
+/* Make sure all subchannels are quiet before we re-ipl an lpar. */
+void reipl_ccw_dev(struct ccw_dev_id *devid)
+{
+ struct subchannel_id schid;
+
+ s390_reset_system();
+ if (reipl_find_schid(devid, &schid) != 0)
+ panic("IPL Device not found\n");
+ do_reipl_asm(*((__u32*)&schid));
+}
+
+extern struct schib ipl_schib;
+
+/*
+ * ipl_save_parameters gets called very early. It is not allowed to access
+ * anything in the bss section at all. The bss section is not cleared yet,
+ * but may contain some ipl parameters written by the firmware.
+ * These parameters (if present) are copied to 0x2000.
+ * To avoid corruption of the ipl parameters, all variables used by this
+ * function must reside on the stack or in the data section.
+ */
+void ipl_save_parameters(void)
+{
+ struct subchannel_id schid;
+ unsigned int *ipl_ptr;
+ void *src, *dst;
+
+ schid = *(struct subchannel_id *)__LC_SUBCHANNEL_ID;
+ if (!schid.one)
+ return;
+ if (stsch(schid, &ipl_schib))
+ return;
+ if (!ipl_schib.pmcw.dnv)
+ return;
+ ipl_devno = ipl_schib.pmcw.dev;
+ ipl_flags |= IPL_DEVNO_VALID;
+ if (!ipl_schib.pmcw.qf)
+ return;
+ ipl_flags |= IPL_PARMBLOCK_VALID;
+ ipl_ptr = (unsigned int *)__LC_IPL_PARMBLOCK_PTR;
+ src = (void *)(unsigned long)*ipl_ptr;
+ dst = (void *)IPL_PARMBLOCK_ORIGIN;
+ memmove(dst, src, PAGE_SIZE);
+ *ipl_ptr = IPL_PARMBLOCK_ORIGIN;
}
git://git.onelab.eu / linux-2.6.git / blobdiff