kernel-ark/drivers/s390/cio/device_status.c
Cornelia Huck 8c3ce5bece [S390] cio: Fix handling of interrupt for csch().
Wipe internal irb if the clear function bit is set before accumulating
bits from the irb in order to follow hardware behaviour.

Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2007-04-04 14:37:39 +02:00

398 lines
12 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 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->dev_id.devno, cdev->private->schid.ssid,
cdev->private->schid.sch_no,
irb->scsw.dstat, irb->scsw.cstat);
if (irb->scsw.cc != 3) {
char dbf_text[15];
sprintf(dbf_text, "chk%x", cdev->private->schid.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 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 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 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;
/*
* If the clear function had been performed, all formerly pending
* status at the subchannel has been cleared and we must not pass
* intermediate accumulated status to the device driver.
*/
if (irb->scsw.fctl & SCSW_FCTL_CLEAR_FUNC)
memset(&cdev->private->irb, 0, sizeof(struct 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;
/* dstat is not always valid. */
if (irb->scsw.stctl &
(SCSW_STCTL_PRIM_STATUS | SCSW_STCTL_SEC_STATUS
| SCSW_STCTL_INTER_STATUS | SCSW_STCTL_ALERT_STATUS))
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;
/* Reset internal retry indication. */
cdev->private->flags.intretry = 0;
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;
}