400 lines
12 KiB
C
Executable File
400 lines
12 KiB
C
Executable File
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* Copyright IBM Corp. 2002
|
|
* 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"
|
|
#include "io_sch.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)
|
|
{
|
|
struct subchannel *sch = to_subchannel(cdev->dev.parent);
|
|
char dbf_text[15];
|
|
|
|
if (!scsw_is_valid_cstat(&irb->scsw) ||
|
|
!(scsw_cstat(&irb->scsw) & (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, sch->schid.ssid,
|
|
sch->schid.sch_no,
|
|
scsw_dstat(&irb->scsw), scsw_cstat(&irb->scsw));
|
|
sprintf(dbf_text, "chk%x", sch->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);
|
|
if (cio_update_schib(sch))
|
|
goto doverify;
|
|
|
|
CIO_MSG_EVENT(0, "%s(0.%x.%04x) - path(s) %02x are "
|
|
"not operational \n", __func__,
|
|
sch->schid.ssid, sch->schid.sch_no,
|
|
sch->schib.pmcw.pnom);
|
|
|
|
sch->lpm &= ~sch->schib.pmcw.pnom;
|
|
doverify:
|
|
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.cmd.ectl = 0;
|
|
if ((irb->scsw.cmd.stctl & SCSW_STCTL_ALERT_STATUS) &&
|
|
!(irb->scsw.cmd.stctl & SCSW_STCTL_INTER_STATUS))
|
|
cdev->private->irb.scsw.cmd.ectl = irb->scsw.cmd.ectl;
|
|
/* Check if extended control word is valid. */
|
|
if (!cdev->private->irb.scsw.cmd.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.cmd.eswf &&
|
|
(irb->scsw.cmd.stctl == SCSW_STCTL_STATUS_PEND))
|
|
return 0;
|
|
if (irb->scsw.cmd.stctl ==
|
|
(SCSW_STCTL_INTER_STATUS|SCSW_STCTL_STATUS_PEND) &&
|
|
!(irb->scsw.cmd.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.cmd.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.cmd.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.cmd.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 (!(scsw_stctl(&irb->scsw) & 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 (scsw_is_valid_pno(&irb->scsw) && scsw_pno(&irb->scsw))
|
|
ccw_device_path_notoper(cdev);
|
|
/* No irb accumulation for transport mode irbs. */
|
|
if (scsw_is_tm(&irb->scsw)) {
|
|
memcpy(&cdev->private->irb, irb, sizeof(struct irb));
|
|
return;
|
|
}
|
|
/*
|
|
* Don't accumulate unsolicited interrupts.
|
|
*/
|
|
if (!scsw_is_solicited(&irb->scsw))
|
|
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.cmd.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.cmd.fctl & SCSW_FCTL_START_FUNC) {
|
|
/* Copy key. */
|
|
cdev_irb->scsw.cmd.key = irb->scsw.cmd.key;
|
|
/* Copy suspend control bit. */
|
|
cdev_irb->scsw.cmd.sctl = irb->scsw.cmd.sctl;
|
|
/* Accumulate deferred condition code. */
|
|
cdev_irb->scsw.cmd.cc |= irb->scsw.cmd.cc;
|
|
/* Copy ccw format bit. */
|
|
cdev_irb->scsw.cmd.fmt = irb->scsw.cmd.fmt;
|
|
/* Copy prefetch bit. */
|
|
cdev_irb->scsw.cmd.pfch = irb->scsw.cmd.pfch;
|
|
/* Copy initial-status-interruption-control. */
|
|
cdev_irb->scsw.cmd.isic = irb->scsw.cmd.isic;
|
|
/* Copy address limit checking control. */
|
|
cdev_irb->scsw.cmd.alcc = irb->scsw.cmd.alcc;
|
|
/* Copy suppress suspend bit. */
|
|
cdev_irb->scsw.cmd.ssi = irb->scsw.cmd.ssi;
|
|
}
|
|
|
|
/* Take care of the extended control bit and extended control word. */
|
|
ccw_device_accumulate_ecw(cdev, irb);
|
|
|
|
/* Accumulate function control. */
|
|
cdev_irb->scsw.cmd.fctl |= irb->scsw.cmd.fctl;
|
|
/* Copy activity control. */
|
|
cdev_irb->scsw.cmd.actl = irb->scsw.cmd.actl;
|
|
/* Accumulate status control. */
|
|
cdev_irb->scsw.cmd.stctl |= irb->scsw.cmd.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.cmd.stctl & SCSW_STCTL_PRIM_STATUS) ||
|
|
((irb->scsw.cmd.stctl ==
|
|
(SCSW_STCTL_INTER_STATUS|SCSW_STCTL_STATUS_PEND)) &&
|
|
(irb->scsw.cmd.actl & SCSW_ACTL_DEVACT) &&
|
|
(irb->scsw.cmd.actl & SCSW_ACTL_SCHACT)) ||
|
|
(irb->scsw.cmd.actl & SCSW_ACTL_SUSPENDED))
|
|
cdev_irb->scsw.cmd.cpa = irb->scsw.cmd.cpa;
|
|
/* Accumulate device status, but not the device busy flag. */
|
|
cdev_irb->scsw.cmd.dstat &= ~DEV_STAT_BUSY;
|
|
/* dstat is not always valid. */
|
|
if (irb->scsw.cmd.stctl &
|
|
(SCSW_STCTL_PRIM_STATUS | SCSW_STCTL_SEC_STATUS
|
|
| SCSW_STCTL_INTER_STATUS | SCSW_STCTL_ALERT_STATUS))
|
|
cdev_irb->scsw.cmd.dstat |= irb->scsw.cmd.dstat;
|
|
/* Accumulate subchannel status. */
|
|
cdev_irb->scsw.cmd.cstat |= irb->scsw.cmd.cstat;
|
|
/* Copy residual count if it is valid. */
|
|
if ((irb->scsw.cmd.stctl & SCSW_STCTL_PRIM_STATUS) &&
|
|
(irb->scsw.cmd.cstat & ~(SCHN_STAT_PCI | SCHN_STAT_INCORR_LEN))
|
|
== 0)
|
|
cdev_irb->scsw.cmd.count = irb->scsw.cmd.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.cmd.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;
|
|
struct ccw1 *sense_ccw;
|
|
int rc;
|
|
|
|
sch = to_subchannel(cdev->dev.parent);
|
|
|
|
/* A sense is required, can we do it now ? */
|
|
if (scsw_actl(&irb->scsw) & (SCSW_ACTL_DEVACT | SCSW_ACTL_SCHACT))
|
|
/*
|
|
* 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.
|
|
*/
|
|
sense_ccw = &to_io_private(sch)->sense_ccw;
|
|
sense_ccw->cmd_code = CCW_CMD_BASIC_SENSE;
|
|
sense_ccw->cda = (__u32) __pa(cdev->private->irb.ecw);
|
|
sense_ccw->count = SENSE_MAX_COUNT;
|
|
sense_ccw->flags = CCW_FLAG_SLI;
|
|
|
|
rc = cio_start(sch, sense_ccw, 0xff);
|
|
if (rc == -ENODEV || rc == -EACCES)
|
|
dev_fsm_event(cdev, DEV_EVENT_VERIFY);
|
|
return rc;
|
|
}
|
|
|
|
/*
|
|
* 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 (!(scsw_stctl(&irb->scsw) & 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 (scsw_is_valid_pno(&irb->scsw) && scsw_pno(&irb->scsw))
|
|
ccw_device_path_notoper(cdev);
|
|
|
|
if (!(irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) &&
|
|
(irb->scsw.cmd.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.cmd.actl & (SCSW_ACTL_DEVACT | SCSW_ACTL_SCHACT)) != 0)
|
|
return -EBUSY;
|
|
/* Check for basic sense. */
|
|
if (cdev->private->flags.dosense &&
|
|
!(irb->scsw.cmd.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;
|
|
}
|
|
|