/*
* drivers/s390/cio/cio.c
* S/390 common I/O routines -- low level i/o calls
- * $Revision: 1.138 $
*
- * Copyright (C) 1999-2002 IBM Deutschland Entwicklung GmbH,
- * IBM Corporation
+ * Copyright IBM Corp. 1999,2008
* 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)
*/
+#define KMSG_COMPONENT "cio"
+#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
+
+#include <linux/ftrace.h>
#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 <linux/interrupt.h>
-
#include <asm/cio.h>
#include <asm/delay.h>
#include <asm/irq.h>
-
-#include "airq.h"
+#include <asm/irq_regs.h>
+#include <asm/setup.h>
+#include <asm/reset.h>
+#include <asm/ipl.h>
+#include <asm/chpid.h>
+#include <asm/airq.h>
+#include <asm/isc.h>
+#include <asm/cputime.h>
+#include <asm/fcx.h>
+#include <asm/nmi.h>
+#include <asm/crw.h>
#include "cio.h"
#include "css.h"
#include "chsc.h"
#include "ioasm.h"
+#include "io_sch.h"
#include "blacklist.h"
#include "cio_debug.h"
+#include "chp.h"
debug_info_t *cio_debug_msg_id;
debug_info_t *cio_debug_trace_id;
debug_info_t *cio_debug_crw_id;
-int cio_show_msg;
-
-static int __init
-cio_setup (char *parm)
-{
- if (!strcmp (parm, "yes"))
- cio_show_msg = 1;
- else if (!strcmp (parm, "no"))
- cio_show_msg = 0;
- else
- printk (KERN_ERR "cio_setup : invalid cio_msg parameter '%s'",
- parm);
- return 1;
-}
-
-__setup ("cio_msg=", cio_setup);
-
/*
* Function: cio_debug_init
- * Initializes three debug logs (under /proc/s390dbf) for common I/O:
- * - cio_msg logs the messages which are printk'ed when CONFIG_DEBUG_IO is on
+ * Initializes three debug logs for common I/O:
+ * - cio_msg logs generic cio messages
* - cio_trace logs the calling of different functions
- * - cio_crw logs the messages which are printk'ed when CONFIG_DEBUG_CRW is on
- * debug levels depend on CONFIG_DEBUG_IO resp. CONFIG_DEBUG_CRW
+ * - cio_crw logs machine check related cio messages
*/
-static int __init
-cio_debug_init (void)
+static int __init cio_debug_init(void)
{
- cio_debug_msg_id = debug_register ("cio_msg", 16, 4, 16*sizeof (long));
+ cio_debug_msg_id = debug_register("cio_msg", 16, 1, 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, 2);
- cio_debug_trace_id = debug_register ("cio_trace", 16, 4, 8);
+ debug_register_view(cio_debug_msg_id, &debug_sprintf_view);
+ debug_set_level(cio_debug_msg_id, 2);
+ cio_debug_trace_id = debug_register("cio_trace", 16, 1, 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, 2);
- cio_debug_crw_id = debug_register ("cio_crw", 4, 4, 16*sizeof (long));
+ debug_register_view(cio_debug_trace_id, &debug_hex_ascii_view);
+ debug_set_level(cio_debug_trace_id, 2);
+ cio_debug_crw_id = debug_register("cio_crw", 16, 1, 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, 2);
- pr_debug("debugging initialized\n");
+ debug_register_view(cio_debug_crw_id, &debug_sprintf_view);
+ debug_set_level(cio_debug_crw_id, 4);
return 0;
out_unregister:
if (cio_debug_msg_id)
- debug_unregister (cio_debug_msg_id);
+ debug_unregister(cio_debug_msg_id);
if (cio_debug_trace_id)
- debug_unregister (cio_debug_trace_id);
+ debug_unregister(cio_debug_trace_id);
if (cio_debug_crw_id)
- debug_unregister (cio_debug_crw_id);
- pr_debug("could not initialize debugging\n");
+ debug_unregister(cio_debug_crw_id);
return -1;
}
return flags;
}
-/*
- * Use tpi to get a pending interrupt, call the interrupt handler and
- * return a pointer to the subchannel structure.
- */
-static inline int
-cio_tpi(void)
-{
- struct tpi_info *tpi_info;
- struct subchannel *sch;
- struct irb *irb;
-
- tpi_info = (struct tpi_info *) __LC_SUBCHANNEL_ID;
- if (tpi (NULL) != 1)
- return 0;
- irb = (struct irb *) __LC_IRB;
- /* Store interrupt response block to lowcore. */
- 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);
- memcpy (&sch->schib.scsw, &irb->scsw, sizeof (struct scsw));
- if (sch->driver && sch->driver->irq)
- sch->driver->irq(&sch->dev);
- spin_unlock(&sch->lock);
- irq_exit ();
- __local_bh_enable();
- return 1;
-}
-
-static inline int
+static int
cio_start_handle_notoper(struct subchannel *sch, __u8 lpm)
{
char dbf_text[15];
else
sch->lpm = 0;
- stsch (sch->schid, &sch->schib);
-
- CIO_MSG_EVENT(0, "cio_start: 'not oper' status for "
+ 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);
+
+ if (cio_update_schib(sch))
+ return -ENODEV;
+
+ sprintf(dbf_text, "no%s", dev_name(&sch->dev));
CIO_TRACE_EVENT(0, dbf_text);
CIO_HEX_EVENT(0, &sch->schib, sizeof (struct schib));
__u8 lpm, /* logical path mask */
__u8 key) /* storage key */
{
- char dbf_txt[15];
int ccode;
+ union orb *orb;
- CIO_TRACE_EVENT (4, "stIO");
- CIO_TRACE_EVENT (4, sch->dev.bus_id);
+ CIO_TRACE_EVENT(5, "stIO");
+ CIO_TRACE_EVENT(5, dev_name(&sch->dev));
+ orb = &to_io_private(sch)->orb;
+ memset(orb, 0, sizeof(union orb));
/* sch is always under 2G. */
- sch->orb.intparm = (__u32)(unsigned long)sch;
- sch->orb.fmt = 1;
-
- 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
+ orb->cmd.intparm = (u32)(addr_t)sch;
+ orb->cmd.fmt = 1;
+
+ 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
*/
- sch->orb.c64 = 1;
- sch->orb.i2k = 0;
+ orb->cmd.c64 = 1;
+ orb->cmd.i2k = 0;
#endif
- sch->orb.key = key >> 4;
+ orb->cmd.key = key >> 4;
/* issue "Start Subchannel" */
- sch->orb.cpa = (__u32) __pa (cpa);
- ccode = ssch (sch->schid, &sch->orb);
+ orb->cmd.cpa = (__u32) __pa(cpa);
+ ccode = ssch(sch->schid, orb);
/* process condition code */
- sprintf (dbf_txt, "ccode:%d", ccode);
- CIO_TRACE_EVENT (4, dbf_txt);
+ CIO_HEX_EVENT(5, &ccode, sizeof(ccode));
switch (ccode) {
case 0:
/*
* 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;
}
}
int
cio_resume (struct subchannel *sch)
{
- char dbf_txt[15];
int ccode;
- CIO_TRACE_EVENT (4, "resIO");
- CIO_TRACE_EVENT (4, sch->dev.bus_id);
+ CIO_TRACE_EVENT(4, "resIO");
+ CIO_TRACE_EVENT(4, dev_name(&sch->dev));
ccode = rsch (sch->schid);
- sprintf (dbf_txt, "ccode:%d", ccode);
- CIO_TRACE_EVENT (4, dbf_txt);
+ CIO_HEX_EVENT(4, &ccode, sizeof(ccode));
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;
int
cio_halt(struct subchannel *sch)
{
- char dbf_txt[15];
int ccode;
if (!sch)
return -ENODEV;
- CIO_TRACE_EVENT (2, "haltIO");
- CIO_TRACE_EVENT (2, sch->dev.bus_id);
+ CIO_TRACE_EVENT(2, "haltIO");
+ CIO_TRACE_EVENT(2, dev_name(&sch->dev));
/*
* Issue "Halt subchannel" and process condition code
*/
ccode = hsch (sch->schid);
- sprintf (dbf_txt, "ccode:%d", ccode);
- CIO_TRACE_EVENT (2, dbf_txt);
+ CIO_HEX_EVENT(2, &ccode, sizeof(ccode));
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 */
int
cio_clear(struct subchannel *sch)
{
- char dbf_txt[15];
int ccode;
if (!sch)
return -ENODEV;
- CIO_TRACE_EVENT (2, "clearIO");
- CIO_TRACE_EVENT (2, sch->dev.bus_id);
+ CIO_TRACE_EVENT(2, "clearIO");
+ CIO_TRACE_EVENT(2, dev_name(&sch->dev));
/*
* Issue "Clear subchannel" and process condition code
*/
ccode = csch (sch->schid);
- sprintf (dbf_txt, "ccode:%d", ccode);
- CIO_TRACE_EVENT (2, dbf_txt);
+ CIO_HEX_EVENT(2, &ccode, sizeof(ccode));
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;
int
cio_cancel (struct subchannel *sch)
{
- char dbf_txt[15];
int ccode;
if (!sch)
return -ENODEV;
- CIO_TRACE_EVENT (2, "cancelIO");
- CIO_TRACE_EVENT (2, sch->dev.bus_id);
+ CIO_TRACE_EVENT(2, "cancelIO");
+ CIO_TRACE_EVENT(2, dev_name(&sch->dev));
ccode = xsch (sch->schid);
- sprintf (dbf_txt, "ccode:%d", ccode);
- CIO_TRACE_EVENT (2, dbf_txt);
+ CIO_HEX_EVENT(2, &ccode, sizeof(ccode));
switch (ccode) {
case 0: /* success */
/* Update information in scsw. */
- stsch (sch->schid, &sch->schib);
+ if (cio_update_schib(sch))
+ return -ENODEV;
return 0;
case 1: /* status pending */
return -EBUSY;
}
}
+
+static void cio_apply_config(struct subchannel *sch, struct schib *schib)
+{
+ schib->pmcw.intparm = sch->config.intparm;
+ schib->pmcw.mbi = sch->config.mbi;
+ schib->pmcw.isc = sch->config.isc;
+ schib->pmcw.ena = sch->config.ena;
+ schib->pmcw.mme = sch->config.mme;
+ schib->pmcw.mp = sch->config.mp;
+ schib->pmcw.csense = sch->config.csense;
+ schib->pmcw.mbfc = sch->config.mbfc;
+ if (sch->config.mbfc)
+ schib->mba = sch->config.mba;
+}
+
+static int cio_check_config(struct subchannel *sch, struct schib *schib)
+{
+ return (schib->pmcw.intparm == sch->config.intparm) &&
+ (schib->pmcw.mbi == sch->config.mbi) &&
+ (schib->pmcw.isc == sch->config.isc) &&
+ (schib->pmcw.ena == sch->config.ena) &&
+ (schib->pmcw.mme == sch->config.mme) &&
+ (schib->pmcw.mp == sch->config.mp) &&
+ (schib->pmcw.csense == sch->config.csense) &&
+ (schib->pmcw.mbfc == sch->config.mbfc) &&
+ (!sch->config.mbfc || (schib->mba == sch->config.mba));
+}
+
/*
- * Function: cio_modify
- * Issues a "Modify Subchannel" on the specified subchannel
+ * cio_commit_config - apply configuration to the subchannel
*/
-int
-cio_modify (struct subchannel *sch)
+int cio_commit_config(struct subchannel *sch)
{
- int ccode, retry, ret;
+ struct schib schib;
+ int ccode, retry, ret = 0;
+
+ if (stsch_err(sch->schid, &schib) || !css_sch_is_valid(&schib))
+ return -ENODEV;
- ret = 0;
for (retry = 0; retry < 5; retry++) {
- ccode = msch_err (sch->schid, &sch->schib);
- if (ccode < 0) /* -EIO if msch gets a program check. */
+ /* copy desired changes to local schib */
+ cio_apply_config(sch, &schib);
+ ccode = msch_err(sch->schid, &schib);
+ if (ccode < 0) /* -EIO if msch gets a program check. */
return ccode;
switch (ccode) {
- case 0: /* successfull */
- return 0;
- case 1: /* status pending */
+ case 0: /* successful */
+ if (stsch_err(sch->schid, &schib) ||
+ !css_sch_is_valid(&schib))
+ return -ENODEV;
+ if (cio_check_config(sch, &schib)) {
+ /* commit changes from local schib */
+ memcpy(&sch->schib, &schib, sizeof(schib));
+ return 0;
+ }
+ ret = -EAGAIN;
+ break;
+ case 1: /* status pending */
return -EBUSY;
- case 2: /* busy */
- udelay (100); /* allow for recovery */
+ case 2: /* busy */
+ udelay(100); /* allow for recovery */
ret = -EBUSY;
break;
- case 3: /* not operational */
+ case 3: /* not operational */
return -ENODEV;
}
}
return ret;
}
-/*
- * Enable subchannel.
+/**
+ * cio_update_schib - Perform stsch and update schib if subchannel is valid.
+ * @sch: subchannel on which to perform stsch
+ * Return zero on success, -ENODEV otherwise.
*/
-int
-cio_enable_subchannel (struct subchannel *sch, unsigned int isc)
+int cio_update_schib(struct subchannel *sch)
+{
+ struct schib schib;
+
+ if (stsch_err(sch->schid, &schib) || !css_sch_is_valid(&schib))
+ return -ENODEV;
+
+ memcpy(&sch->schib, &schib, sizeof(schib));
+ return 0;
+}
+EXPORT_SYMBOL_GPL(cio_update_schib);
+
+/**
+ * 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)
{
- char dbf_txt[15];
- int ccode;
int retry;
int ret;
- CIO_TRACE_EVENT (2, "ensch");
- CIO_TRACE_EVENT (2, sch->dev.bus_id);
+ CIO_TRACE_EVENT(2, "ensch");
+ CIO_TRACE_EVENT(2, dev_name(&sch->dev));
- ccode = stsch (sch->schid, &sch->schib);
- if (ccode)
+ if (sch_is_pseudo_sch(sch))
+ return -EINVAL;
+ if (cio_update_schib(sch))
return -ENODEV;
- 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;
- if (ret == -EIO)
+ sch->config.ena = 1;
+ sch->config.isc = sch->isc;
+ sch->config.intparm = intparm;
+
+ for (retry = 0; retry < 3; retry++) {
+ ret = cio_commit_config(sch);
+ if (ret == -EIO) {
/*
- * Got a program check in cio_modify. Try without
+ * Got a program check in msch. Try without
* the concurrent sense bit the next time.
*/
- sch->schib.pmcw.csense = 0;
- if (ret == 0) {
- stsch (sch->schid, &sch->schib);
- if (sch->schib.pmcw.ena)
- break;
- }
- if (ret == -EBUSY) {
+ sch->config.csense = 0;
+ } else if (ret == -EBUSY) {
struct irb irb;
if (tsch(sch->schid, &irb) != 0)
break;
- }
+ } else
+ break;
}
- sprintf (dbf_txt, "ret:%d", ret);
- CIO_TRACE_EVENT (2, dbf_txt);
+ CIO_HEX_EVENT(2, &ret, sizeof(ret));
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;
int retry;
int ret;
- CIO_TRACE_EVENT (2, "dissch");
- CIO_TRACE_EVENT (2, sch->dev.bus_id);
+ CIO_TRACE_EVENT(2, "dissch");
+ CIO_TRACE_EVENT(2, dev_name(&sch->dev));
- ccode = stsch (sch->schid, &sch->schib);
- if (ccode == 3) /* Not operational. */
+ if (sch_is_pseudo_sch(sch))
+ return 0;
+ if (cio_update_schib(sch))
return -ENODEV;
- if (sch->schib.scsw.actl != 0)
- /*
- * the disable function must not be called while there are
- * requests pending for completion !
- */
- return -EBUSY;
+ sch->config.ena = 0;
- for (retry = 5, ret = 0; retry > 0; retry--) {
- sch->schib.pmcw.ena = 0;
- ret = cio_modify(sch);
- if (ret == -ENODEV)
- break;
- if (ret == -EBUSY)
- /*
- * The subchannel is busy or status pending.
- * We'll disable when the next interrupt was delivered
- * via the state machine.
- */
- break;
- if (ret == 0) {
- stsch (sch->schid, &sch->schib);
- if (!sch->schib.pmcw.ena)
+ for (retry = 0; retry < 3; retry++) {
+ ret = cio_commit_config(sch);
+ if (ret == -EBUSY) {
+ struct irb irb;
+ if (tsch(sch->schid, &irb) != 0)
break;
- }
+ } else
+ break;
}
- sprintf (dbf_txt, "ret:%d", ret);
- CIO_TRACE_EVENT (2, dbf_txt);
+ CIO_HEX_EVENT(2, &ret, sizeof(ret));
return ret;
}
+EXPORT_SYMBOL_GPL(cio_disable_subchannel);
-/*
- * cio_validate_subchannel()
+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;
+}
+
+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));
- spin_lock_init(&sch->lock);
-
- /* Set a name for the subchannel */
- snprintf (sch->dev.bus_id, BUS_ID_SIZE, "0.%x.%04x", schid.ssid,
- schid.sch_no);
+ 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);
/*
* The first subchannel that is not-operational (ccode==3)
* 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;
- /*
- * ... just being curious we check for non I/O subchannels
- */
- if (sch->st != 0) {
- CIO_DEBUG(KERN_INFO, 0,
- "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. */
- return sch->st;
- }
-
- /* Initialization for io subchannels. */
- if (!sch->schib.pmcw.dnv)
- /* io subchannel but device number is invalid. */
- return -ENODEV;
-
- /* 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(0, "Blacklisted device detected "
- "at devno %04X, subchannel set %x\n",
- sch->schib.pmcw.dev, sch->schid.ssid);
- return -ENODEV;
+ 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;
}
- sch->opm = 0xff;
- if (!cio_is_console(sch->schid))
- chsc_validate_chpids(sch);
- sch->lpm = sch->schib.pmcw.pim &
- sch->schib.pmcw.pam &
- sch->schib.pmcw.pom &
- sch->opm;
-
- CIO_DEBUG(KERN_INFO, 0,
- "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);
+ if (err)
+ goto out;
- /*
- * We now have to initially ...
- * ... set "interruption subclass"
- * ... 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.isc = 3; /* could be smth. else */
- 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 */
+ 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))
+ kfree(sch->lock);
+ sch->lock = NULL;
+ return err;
}
/*
* handlers).
*
*/
-void
-do_IRQ (struct pt_regs *regs)
+void __irq_entry do_IRQ(struct pt_regs *regs)
{
struct tpi_info *tpi_info;
struct subchannel *sch;
struct irb *irb;
-
- 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);
+ struct pt_regs *old_regs;
+
+ old_regs = set_irq_regs(regs);
+ s390_idle_check();
+ irq_enter();
+ __get_cpu_var(s390_idle).nohz_delay = 1;
+ if (S390_lowcore.int_clock >= S390_lowcore.clock_comparator)
+ /* Serve timer interrupts first. */
+ clock_comparator_work();
/*
* Get interrupt information from lowcore
*/
- tpi_info = (struct tpi_info *) __LC_SUBCHANNEL_ID;
- irb = (struct irb *) __LC_IRB;
+ tpi_info = (struct tpi_info *)&S390_lowcore.subchannel_id;
+ irb = (struct irb *)&S390_lowcore.irb;
do {
kstat_cpu(smp_processor_id()).irqs[IO_INTERRUPT]++;
/*
*/
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;
- if (sch)
- spin_lock(&sch->lock);
+ if (!sch) {
+ /* Clear pending interrupt condition. */
+ tsch(tpi_info->schid, irb);
+ continue;
+ }
+ spin_lock(sch->lock);
/* Store interrupt response block to lowcore. */
- if (tsch (tpi_info->schid, irb) == 0 && sch) {
+ if (tsch(tpi_info->schid, irb) == 0) {
/* Keep subchannel information word up to date. */
memcpy (&sch->schib.scsw, &irb->scsw,
sizeof (irb->scsw));
/* Call interrupt handler if there is one. */
if (sch->driver && sch->driver->irq)
- sch->driver->irq(&sch->dev);
+ sch->driver->irq(sch);
}
- if (sch)
- spin_unlock(&sch->lock);
+ spin_unlock(sch->lock);
/*
* Are more interrupts pending?
* If so, the tpi instruction will update the lowcore
* We don't do this for VM because a tpi drops the cpu
* out of the sie which costs more cycles than it saves.
*/
- } while (!MACHINE_IS_VM && tpi (NULL) != 0);
- irq_exit ();
+ } while (MACHINE_IS_LPAR && tpi(NULL) != 0);
+ irq_exit();
+ set_irq_regs(old_regs);
}
#ifdef CONFIG_CCW_CONSOLE
static struct subchannel console_subchannel;
+static struct io_subchannel_private console_priv;
static int console_subchannel_in_use;
/*
+ * Use tpi to get a pending interrupt, call the interrupt handler and
+ * return a pointer to the subchannel structure.
+ */
+static int cio_tpi(void)
+{
+ struct tpi_info *tpi_info;
+ struct subchannel *sch;
+ struct irb *irb;
+ int irq_context;
+
+ tpi_info = (struct tpi_info *)&S390_lowcore.subchannel_id;
+ if (tpi(NULL) != 1)
+ return 0;
+ irb = (struct irb *)&S390_lowcore.irb;
+ /* Store interrupt response block to lowcore. */
+ 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;
+ irq_context = in_interrupt();
+ if (!irq_context)
+ local_bh_disable();
+ irq_enter();
+ spin_lock(sch->lock);
+ 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();
+ if (!irq_context)
+ _local_bh_enable();
+ return 1;
+}
+
+void *cio_get_console_priv(void)
+{
+ return &console_priv;
+}
+
+/*
* busy wait for the next interrupt on the console
*/
-void
-wait_cons_dev (void)
+void wait_cons_dev(void)
+ __releases(console_subchannel.lock)
+ __acquires(console_subchannel.lock)
{
unsigned long cr6 __attribute__ ((aligned (8)));
unsigned long save_cr6 __attribute__ ((aligned (8)));
if (!console_subchannel_in_use)
return;
- /* disable all but isc 7 (console device) */
+ /* disable all but the console isc */
__ctl_store (save_cr6, 6, 6);
- cr6 = 0x01000000;
+ cr6 = 1UL << (31 - CONSOLE_ISC);
__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);
- } while (console_subchannel.schib.scsw.actl != 0);
+ spin_lock(console_subchannel.lock);
+ } while (console_subchannel.schib.scsw.cmd.actl != 0);
/*
* restore previous isc value
*/
{
if (stsch_err(schid, &console_subchannel.schib) != 0)
return -ENXIO;
- if (console_subchannel.schib.pmcw.dnv &&
- console_subchannel.schib.pmcw.dev ==
- console_devno) {
+ if ((console_subchannel.schib.pmcw.st == SUBCHANNEL_TYPE_IO) &&
+ console_subchannel.schib.pmcw.dnv &&
+ (console_subchannel.schib.pmcw.dev == console_devno)) {
console_irq = schid.sch_no;
return 1; /* found */
}
if (console_irq != -1) {
/* VM provided us with the irq number of the console. */
schid.sch_no = console_irq;
- if (stsch(schid, &console_subchannel.schib) != 0 ||
+ if (stsch_err(schid, &console_subchannel.schib) != 0 ||
+ (console_subchannel.schib.pmcw.st != SUBCHANNEL_TYPE_IO) ||
!console_subchannel.schib.pmcw.dnv)
return -1;
console_devno = console_subchannel.schib.pmcw.dev;
/* 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 "No ccw console found!\n");
return -1;
}
return console_irq;
sch_no = cio_get_console_sch_no();
if (sch_no == -1) {
console_subchannel_in_use = 0;
+ pr_warning("No CCW console was found\n");
return ERR_PTR(-ENODEV);
}
memset(&console_subchannel, 0, sizeof(struct subchannel));
}
/*
- * enable console I/O-interrupt subclass 7
+ * enable console I/O-interrupt subclass
*/
- ctl_set_bit(6, 24);
- console_subchannel.schib.pmcw.isc = 7;
- console_subchannel.schib.pmcw.intparm =
- (__u32)(unsigned long)&console_subchannel;
- ret = cio_modify(&console_subchannel);
+ isc_register(CONSOLE_ISC);
+ console_subchannel.config.isc = CONSOLE_ISC;
+ console_subchannel.config.intparm = (u32)(addr_t)&console_subchannel;
+ ret = cio_commit_config(&console_subchannel);
if (ret) {
+ isc_unregister(CONSOLE_ISC);
console_subchannel_in_use = 0;
return ERR_PTR(ret);
}
void
cio_release_console(void)
{
- console_subchannel.schib.pmcw.intparm = 0;
- cio_modify(&console_subchannel);
- ctl_clear_bit(6, 24);
+ console_subchannel.config.intparm = 0;
+ cio_commit_config(&console_subchannel);
+ isc_unregister(CONSOLE_ISC);
console_subchannel_in_use = 0;
}
cio_get_console_subchannel(void)
{
if (!console_subchannel_in_use)
- return 0;
+ return NULL;
return &console_subchannel;
}
#endif
-static inline int
+static int
__disable_subchannel_easy(struct subchannel_id schid, struct schib *schib)
{
int retry, cc;
cc = 0;
for (retry=0;retry<3;retry++) {
schib->pmcw.ena = 0;
- cc = msch(schid, schib);
+ cc = msch_err(schid, schib);
if (cc)
return (cc==3?-ENODEV:-EBUSY);
- stsch(schid, schib);
+ if (stsch_err(schid, schib) || !css_sch_is_valid(schib))
+ return -ENODEV;
if (!schib->pmcw.ena)
return 0;
}
return -EBUSY; /* uhm... */
}
-static inline int
-__clear_subchannel_easy(struct subchannel_id schid)
+static int
+__clear_io_subchannel_easy(struct subchannel_id schid)
{
int retry;
struct tpi_info ti;
if (tpi(&ti)) {
- tsch(ti.schid, (struct irb *)__LC_IRB);
+ tsch(ti.schid, (struct irb *)&S390_lowcore.irb);
if (schid_equal(&ti.schid, &schid))
return 0;
}
- udelay(100);
+ udelay_simple(100);
}
return -EBUSY;
}
-extern void do_reipl(unsigned long devno);
-static int
-__shutdown_subchannel_easy(struct subchannel_id schid, void *data)
+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)
+{
+ pgm_check_occured = 1;
+}
+
+static int stsch_reset(struct subchannel_id schid, struct schib *addr)
+{
+ int rc;
+
+ pgm_check_occured = 0;
+ s390_base_pgm_handler_fn = cio_reset_pgm_check_handler;
+ rc = stsch_err(schid, addr);
+ s390_base_pgm_handler_fn = 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_err(schid, &schib))
+ if (stsch_reset(schid, &schib))
return -ENXIO;
if (!schib.pmcw.ena)
return 0;
case -ENODEV:
break;
default: /* -EBUSY */
- if (__clear_subchannel_easy(schid))
- break; /* give up... */
- stsch(schid, &schib);
+ 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_err(schid, &schib);
__disable_subchannel_easy(schid, &schib);
}
+out:
return 0;
}
-void
-clear_all_subchannels(void)
+static atomic_t chpid_reset_count;
+
+static void s390_reset_chpids_mcck_handler(void)
{
- local_irq_disable();
- for_each_subchannel(__shutdown_subchannel_easy, NULL);
+ 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;
+ struct chp_id chpid;
+
+ /* Reset subchannels. */
+ for_each_subchannel(__shutdown_subchannel_easy, NULL);
+ /* Reset channel paths. */
+ s390_base_mcck_handler_fn = s390_reset_chpids_mcck_handler;
+ /* Enable channel report machine checks. */
+ __ctl_set_bit(14, 28);
+ /* Temporarily reenable machine checks. */
+ local_mcck_enable();
+ chp_id_init(&chpid);
+ for (i = 0; i <= __MAX_CHPID; i++) {
+ chpid.id = i;
+ ret = rchp(chpid);
+ 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_base_mcck_handler_fn = 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.st == SUBCHANNEL_TYPE_IO) && 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(unsigned long devno)
+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));
+}
+
+int __init cio_get_iplinfo(struct cio_iplinfo *iplinfo)
+{
+ struct subchannel_id schid;
+ struct schib schib;
+
+ schid = *(struct subchannel_id *)&S390_lowcore.subchannel_id;
+ if (!schid.one)
+ return -ENODEV;
+ if (stsch_err(schid, &schib))
+ return -ENODEV;
+ if (schib.pmcw.st != SUBCHANNEL_TYPE_IO)
+ return -ENODEV;
+ if (!schib.pmcw.dnv)
+ return -ENODEV;
+ iplinfo->devno = schib.pmcw.dev;
+ 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)
{
- clear_all_subchannels();
- do_reipl(devno);
+ 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;
+ }
}
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff