android_kernel_motorola_sm6225/drivers/s390/cio/device_status.c
Cornelia Huck 7e560814de [S390] path grouping and path verifications fixes.
1. Multipath devices for which SetPGID is not supported are not handled well.
   Use NOP ccws for path verification (sans path grouping) when SetPGID is not
   supported.
2. Check for PGIDs already set with SensePGID on _all_ paths (not just the
   first one) and try to find a common one. Moan if no common PGID can be
   found (and use NOP verification). If no PGIDs have been set, use the css
   global PGID (as before). (Rationale: SetPGID will get a command reject if
   the PGID it tries to set does not match the already set PGID.)
3. Immediately before reboot, issue RESET CHANNEL PATH (rcp) on all chpids. This
   will remove the old PGIDs. rcp will generate solicited CRWs which can be
   savely ignored by the machine check handler (all other actions create
   unsolicited CRWs).

Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2006-07-12 16:40:19 +02:00

383 lines
11 KiB
C

/*
* drivers/s390/cio/device_status.c
*
* Copyright (C) 2002 IBM Deutschland Entwicklung GmbH,
* IBM Corporation
* Author(s): Cornelia Huck (cornelia.huck@de.ibm.com)
* Martin Schwidefsky (schwidefsky@de.ibm.com)
*
* Status accumulation and basic sense functions.
*/
#include <linux/module.h>
#include <linux/init.h>
#include <asm/ccwdev.h>
#include <asm/cio.h>
#include "cio.h"
#include "cio_debug.h"
#include "css.h"
#include "device.h"
#include "ioasm.h"
/*
* Check for any kind of channel or interface control check but don't
* issue the message for the console device
*/
static inline void
ccw_device_msg_control_check(struct ccw_device *cdev, struct irb *irb)
{
if (!(irb->scsw.cstat & (SCHN_STAT_CHN_DATA_CHK |
SCHN_STAT_CHN_CTRL_CHK |
SCHN_STAT_INTF_CTRL_CHK)))
return;
CIO_MSG_EVENT(0, "Channel-Check or Interface-Control-Check "
"received"
" ... device %04x on subchannel 0.%x.%04x, dev_stat "
": %02X sch_stat : %02X\n",
cdev->private->devno, cdev->private->ssid,
cdev->private->sch_no,
irb->scsw.dstat, irb->scsw.cstat);
if (irb->scsw.cc != 3) {
char dbf_text[15];
sprintf(dbf_text, "chk%x", cdev->private->sch_no);
CIO_TRACE_EVENT(0, dbf_text);
CIO_HEX_EVENT(0, irb, sizeof (struct irb));
}
}
/*
* Some paths became not operational (pno bit in scsw is set).
*/
static void
ccw_device_path_notoper(struct ccw_device *cdev)
{
struct subchannel *sch;
sch = to_subchannel(cdev->dev.parent);
stsch (sch->schid, &sch->schib);
CIO_MSG_EVENT(0, "%s(0.%x.%04x) - path(s) %02x are "
"not operational \n", __FUNCTION__,
sch->schid.ssid, sch->schid.sch_no,
sch->schib.pmcw.pnom);
sch->lpm &= ~sch->schib.pmcw.pnom;
cdev->private->flags.doverify = 1;
}
/*
* Copy valid bits from the extended control word to device irb.
*/
static inline void
ccw_device_accumulate_ecw(struct ccw_device *cdev, struct irb *irb)
{
/*
* Copy extended control bit if it is valid... yes there
* are condition that have to be met for the extended control
* bit to have meaning. Sick.
*/
cdev->private->irb.scsw.ectl = 0;
if ((irb->scsw.stctl & SCSW_STCTL_ALERT_STATUS) &&
!(irb->scsw.stctl & SCSW_STCTL_INTER_STATUS))
cdev->private->irb.scsw.ectl = irb->scsw.ectl;
/* Check if extended control word is valid. */
if (!cdev->private->irb.scsw.ectl)
return;
/* Copy concurrent sense / model dependent information. */
memcpy (&cdev->private->irb.ecw, irb->ecw, sizeof (irb->ecw));
}
/*
* Check if extended status word is valid.
*/
static inline int
ccw_device_accumulate_esw_valid(struct irb *irb)
{
if (!irb->scsw.eswf && irb->scsw.stctl == SCSW_STCTL_STATUS_PEND)
return 0;
if (irb->scsw.stctl ==
(SCSW_STCTL_INTER_STATUS|SCSW_STCTL_STATUS_PEND) &&
!(irb->scsw.actl & SCSW_ACTL_SUSPENDED))
return 0;
return 1;
}
/*
* Copy valid bits from the extended status word to device irb.
*/
static inline void
ccw_device_accumulate_esw(struct ccw_device *cdev, struct irb *irb)
{
struct irb *cdev_irb;
struct sublog *cdev_sublog, *sublog;
if (!ccw_device_accumulate_esw_valid(irb))
return;
cdev_irb = &cdev->private->irb;
/* Copy last path used mask. */
cdev_irb->esw.esw1.lpum = irb->esw.esw1.lpum;
/* Copy subchannel logout information if esw is of format 0. */
if (irb->scsw.eswf) {
cdev_sublog = &cdev_irb->esw.esw0.sublog;
sublog = &irb->esw.esw0.sublog;
/* Copy extended status flags. */
cdev_sublog->esf = sublog->esf;
/*
* Copy fields that have a meaning for channel data check
* channel control check and interface control check.
*/
if (irb->scsw.cstat & (SCHN_STAT_CHN_DATA_CHK |
SCHN_STAT_CHN_CTRL_CHK |
SCHN_STAT_INTF_CTRL_CHK)) {
/* Copy ancillary report bit. */
cdev_sublog->arep = sublog->arep;
/* Copy field-validity-flags. */
cdev_sublog->fvf = sublog->fvf;
/* Copy storage access code. */
cdev_sublog->sacc = sublog->sacc;
/* Copy termination code. */
cdev_sublog->termc = sublog->termc;
/* Copy sequence code. */
cdev_sublog->seqc = sublog->seqc;
}
/* Copy device status check. */
cdev_sublog->devsc = sublog->devsc;
/* Copy secondary error. */
cdev_sublog->serr = sublog->serr;
/* Copy i/o-error alert. */
cdev_sublog->ioerr = sublog->ioerr;
/* Copy channel path timeout bit. */
if (irb->scsw.cstat & SCHN_STAT_INTF_CTRL_CHK)
cdev_irb->esw.esw0.erw.cpt = irb->esw.esw0.erw.cpt;
/* Copy failing storage address validity flag. */
cdev_irb->esw.esw0.erw.fsavf = irb->esw.esw0.erw.fsavf;
if (cdev_irb->esw.esw0.erw.fsavf) {
/* ... and copy the failing storage address. */
memcpy(cdev_irb->esw.esw0.faddr, irb->esw.esw0.faddr,
sizeof (irb->esw.esw0.faddr));
/* ... and copy the failing storage address format. */
cdev_irb->esw.esw0.erw.fsaf = irb->esw.esw0.erw.fsaf;
}
/* Copy secondary ccw address validity bit. */
cdev_irb->esw.esw0.erw.scavf = irb->esw.esw0.erw.scavf;
if (irb->esw.esw0.erw.scavf)
/* ... and copy the secondary ccw address. */
cdev_irb->esw.esw0.saddr = irb->esw.esw0.saddr;
}
/* FIXME: DCTI for format 2? */
/* Copy authorization bit. */
cdev_irb->esw.esw0.erw.auth = irb->esw.esw0.erw.auth;
/* Copy path verification required flag. */
cdev_irb->esw.esw0.erw.pvrf = irb->esw.esw0.erw.pvrf;
if (irb->esw.esw0.erw.pvrf)
cdev->private->flags.doverify = 1;
/* Copy concurrent sense bit. */
cdev_irb->esw.esw0.erw.cons = irb->esw.esw0.erw.cons;
if (irb->esw.esw0.erw.cons)
cdev_irb->esw.esw0.erw.scnt = irb->esw.esw0.erw.scnt;
}
/*
* Accumulate status from irb to devstat.
*/
void
ccw_device_accumulate_irb(struct ccw_device *cdev, struct irb *irb)
{
struct irb *cdev_irb;
/*
* Check if the status pending bit is set in stctl.
* If not, the remaining bit have no meaning and we must ignore them.
* The esw is not meaningful as well...
*/
if (!(irb->scsw.stctl & SCSW_STCTL_STATUS_PEND))
return;
/* Check for channel checks and interface control checks. */
ccw_device_msg_control_check(cdev, irb);
/* Check for path not operational. */
if (irb->scsw.pno && irb->scsw.fctl != 0 &&
(!(irb->scsw.stctl & SCSW_STCTL_INTER_STATUS) ||
(irb->scsw.actl & SCSW_ACTL_SUSPENDED)))
ccw_device_path_notoper(cdev);
/*
* Don't accumulate unsolicited interrupts.
*/
if ((irb->scsw.stctl ==
(SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) &&
(!irb->scsw.cc))
return;
cdev_irb = &cdev->private->irb;
/* Copy bits which are valid only for the start function. */
if (irb->scsw.fctl & SCSW_FCTL_START_FUNC) {
/* Copy key. */
cdev_irb->scsw.key = irb->scsw.key;
/* Copy suspend control bit. */
cdev_irb->scsw.sctl = irb->scsw.sctl;
/* Accumulate deferred condition code. */
cdev_irb->scsw.cc |= irb->scsw.cc;
/* Copy ccw format bit. */
cdev_irb->scsw.fmt = irb->scsw.fmt;
/* Copy prefetch bit. */
cdev_irb->scsw.pfch = irb->scsw.pfch;
/* Copy initial-status-interruption-control. */
cdev_irb->scsw.isic = irb->scsw.isic;
/* Copy address limit checking control. */
cdev_irb->scsw.alcc = irb->scsw.alcc;
/* Copy suppress suspend bit. */
cdev_irb->scsw.ssi = irb->scsw.ssi;
}
/* Take care of the extended control bit and extended control word. */
ccw_device_accumulate_ecw(cdev, irb);
/* Accumulate function control. */
cdev_irb->scsw.fctl |= irb->scsw.fctl;
/* Copy activity control. */
cdev_irb->scsw.actl= irb->scsw.actl;
/* Accumulate status control. */
cdev_irb->scsw.stctl |= irb->scsw.stctl;
/*
* Copy ccw address if it is valid. This is a bit simplified
* but should be close enough for all practical purposes.
*/
if ((irb->scsw.stctl & SCSW_STCTL_PRIM_STATUS) ||
((irb->scsw.stctl ==
(SCSW_STCTL_INTER_STATUS|SCSW_STCTL_STATUS_PEND)) &&
(irb->scsw.actl & SCSW_ACTL_DEVACT) &&
(irb->scsw.actl & SCSW_ACTL_SCHACT)) ||
(irb->scsw.actl & SCSW_ACTL_SUSPENDED))
cdev_irb->scsw.cpa = irb->scsw.cpa;
/* Accumulate device status, but not the device busy flag. */
cdev_irb->scsw.dstat &= ~DEV_STAT_BUSY;
cdev_irb->scsw.dstat |= irb->scsw.dstat;
/* Accumulate subchannel status. */
cdev_irb->scsw.cstat |= irb->scsw.cstat;
/* Copy residual count if it is valid. */
if ((irb->scsw.stctl & SCSW_STCTL_PRIM_STATUS) &&
(irb->scsw.cstat & ~(SCHN_STAT_PCI | SCHN_STAT_INCORR_LEN)) == 0)
cdev_irb->scsw.count = irb->scsw.count;
/* Take care of bits in the extended status word. */
ccw_device_accumulate_esw(cdev, irb);
/*
* Check whether we must issue a SENSE CCW ourselves if there is no
* concurrent sense facility installed for the subchannel.
* No sense is required if no delayed sense is pending
* and we did not get a unit check without sense information.
*
* Note: We should check for ioinfo[irq]->flags.consns but VM
* violates the ESA/390 architecture and doesn't present an
* operand exception for virtual devices without concurrent
* sense facility available/supported when enabling the
* concurrent sense facility.
*/
if ((cdev_irb->scsw.dstat & DEV_STAT_UNIT_CHECK) &&
!(cdev_irb->esw.esw0.erw.cons))
cdev->private->flags.dosense = 1;
}
/*
* Do a basic sense.
*/
int
ccw_device_do_sense(struct ccw_device *cdev, struct irb *irb)
{
struct subchannel *sch;
sch = to_subchannel(cdev->dev.parent);
/* A sense is required, can we do it now ? */
if ((irb->scsw.actl & (SCSW_ACTL_DEVACT | SCSW_ACTL_SCHACT)) != 0)
/*
* we received an Unit Check but we have no final
* status yet, therefore we must delay the SENSE
* processing. We must not report this intermediate
* status to the device interrupt handler.
*/
return -EBUSY;
/*
* We have ending status but no sense information. Do a basic sense.
*/
sch->sense_ccw.cmd_code = CCW_CMD_BASIC_SENSE;
sch->sense_ccw.cda = (__u32) __pa(cdev->private->irb.ecw);
sch->sense_ccw.count = SENSE_MAX_COUNT;
sch->sense_ccw.flags = CCW_FLAG_SLI;
return cio_start (sch, &sch->sense_ccw, 0xff);
}
/*
* Add information from basic sense to devstat.
*/
void
ccw_device_accumulate_basic_sense(struct ccw_device *cdev, struct irb *irb)
{
/*
* Check if the status pending bit is set in stctl.
* If not, the remaining bit have no meaning and we must ignore them.
* The esw is not meaningful as well...
*/
if (!(irb->scsw.stctl & SCSW_STCTL_STATUS_PEND))
return;
/* Check for channel checks and interface control checks. */
ccw_device_msg_control_check(cdev, irb);
/* Check for path not operational. */
if (irb->scsw.pno && irb->scsw.fctl != 0 &&
(!(irb->scsw.stctl & SCSW_STCTL_INTER_STATUS) ||
(irb->scsw.actl & SCSW_ACTL_SUSPENDED)))
ccw_device_path_notoper(cdev);
if (!(irb->scsw.dstat & DEV_STAT_UNIT_CHECK) &&
(irb->scsw.dstat & DEV_STAT_CHN_END)) {
cdev->private->irb.esw.esw0.erw.cons = 1;
cdev->private->flags.dosense = 0;
}
/* Check if path verification is required. */
if (ccw_device_accumulate_esw_valid(irb) &&
irb->esw.esw0.erw.pvrf)
cdev->private->flags.doverify = 1;
}
/*
* This function accumulates the status into the private devstat and
* starts a basic sense if one is needed.
*/
int
ccw_device_accumulate_and_sense(struct ccw_device *cdev, struct irb *irb)
{
ccw_device_accumulate_irb(cdev, irb);
if ((irb->scsw.actl & (SCSW_ACTL_DEVACT | SCSW_ACTL_SCHACT)) != 0)
return -EBUSY;
/* Check for basic sense. */
if (cdev->private->flags.dosense &&
!(irb->scsw.dstat & DEV_STAT_UNIT_CHECK)) {
cdev->private->irb.esw.esw0.erw.cons = 1;
cdev->private->flags.dosense = 0;
return 0;
}
if (cdev->private->flags.dosense) {
ccw_device_do_sense(cdev, irb);
return -EBUSY;
}
return 0;
}