forked from Minki/linux
1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
449 lines
12 KiB
C
449 lines
12 KiB
C
/*
|
|
* drivers/s390/cio/device_pgid.c
|
|
*
|
|
* Copyright (C) 2002 IBM Deutschland Entwicklung GmbH,
|
|
* IBM Corporation
|
|
* Author(s): Cornelia Huck(cohuck@de.ibm.com)
|
|
* Martin Schwidefsky (schwidefsky@de.ibm.com)
|
|
*
|
|
* Path Group ID functions.
|
|
*/
|
|
|
|
#include <linux/config.h>
|
|
#include <linux/module.h>
|
|
#include <linux/init.h>
|
|
|
|
#include <asm/ccwdev.h>
|
|
#include <asm/cio.h>
|
|
#include <asm/delay.h>
|
|
#include <asm/lowcore.h>
|
|
|
|
#include "cio.h"
|
|
#include "cio_debug.h"
|
|
#include "css.h"
|
|
#include "device.h"
|
|
|
|
/*
|
|
* Start Sense Path Group ID helper function. Used in ccw_device_recog
|
|
* and ccw_device_sense_pgid.
|
|
*/
|
|
static int
|
|
__ccw_device_sense_pgid_start(struct ccw_device *cdev)
|
|
{
|
|
struct subchannel *sch;
|
|
struct ccw1 *ccw;
|
|
int ret;
|
|
|
|
sch = to_subchannel(cdev->dev.parent);
|
|
/* Setup sense path group id channel program. */
|
|
ccw = cdev->private->iccws;
|
|
ccw->cmd_code = CCW_CMD_SENSE_PGID;
|
|
ccw->cda = (__u32) __pa (&cdev->private->pgid);
|
|
ccw->count = sizeof (struct pgid);
|
|
ccw->flags = CCW_FLAG_SLI;
|
|
|
|
/* Reset device status. */
|
|
memset(&cdev->private->irb, 0, sizeof(struct irb));
|
|
/* Try on every path. */
|
|
ret = -ENODEV;
|
|
while (cdev->private->imask != 0) {
|
|
/* Try every path multiple times. */
|
|
if (cdev->private->iretry > 0) {
|
|
cdev->private->iretry--;
|
|
ret = cio_start (sch, cdev->private->iccws,
|
|
cdev->private->imask);
|
|
/* ret is 0, -EBUSY, -EACCES or -ENODEV */
|
|
if (ret != -EACCES)
|
|
return ret;
|
|
CIO_MSG_EVENT(2, "SNID - Device %04x on Subchannel "
|
|
"%04x, lpm %02X, became 'not "
|
|
"operational'\n",
|
|
cdev->private->devno, sch->irq,
|
|
cdev->private->imask);
|
|
|
|
}
|
|
cdev->private->imask >>= 1;
|
|
cdev->private->iretry = 5;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
void
|
|
ccw_device_sense_pgid_start(struct ccw_device *cdev)
|
|
{
|
|
int ret;
|
|
|
|
cdev->private->state = DEV_STATE_SENSE_PGID;
|
|
cdev->private->imask = 0x80;
|
|
cdev->private->iretry = 5;
|
|
memset (&cdev->private->pgid, 0, sizeof (struct pgid));
|
|
ret = __ccw_device_sense_pgid_start(cdev);
|
|
if (ret && ret != -EBUSY)
|
|
ccw_device_sense_pgid_done(cdev, ret);
|
|
}
|
|
|
|
/*
|
|
* Called from interrupt context to check if a valid answer
|
|
* to Sense Path Group ID was received.
|
|
*/
|
|
static int
|
|
__ccw_device_check_sense_pgid(struct ccw_device *cdev)
|
|
{
|
|
struct subchannel *sch;
|
|
struct irb *irb;
|
|
|
|
sch = to_subchannel(cdev->dev.parent);
|
|
irb = &cdev->private->irb;
|
|
if (irb->scsw.fctl & (SCSW_FCTL_HALT_FUNC | SCSW_FCTL_CLEAR_FUNC))
|
|
return -ETIME;
|
|
if (irb->esw.esw0.erw.cons &&
|
|
(irb->ecw[0]&(SNS0_CMD_REJECT|SNS0_INTERVENTION_REQ))) {
|
|
/*
|
|
* If the device doesn't support the Sense Path Group ID
|
|
* command further retries wouldn't help ...
|
|
*/
|
|
return -EOPNOTSUPP;
|
|
}
|
|
if (irb->esw.esw0.erw.cons) {
|
|
CIO_MSG_EVENT(2, "SNID - device %04x, unit check, "
|
|
"lpum %02X, cnt %02d, sns : "
|
|
"%02X%02X%02X%02X %02X%02X%02X%02X ...\n",
|
|
cdev->private->devno,
|
|
irb->esw.esw0.sublog.lpum,
|
|
irb->esw.esw0.erw.scnt,
|
|
irb->ecw[0], irb->ecw[1],
|
|
irb->ecw[2], irb->ecw[3],
|
|
irb->ecw[4], irb->ecw[5],
|
|
irb->ecw[6], irb->ecw[7]);
|
|
return -EAGAIN;
|
|
}
|
|
if (irb->scsw.cc == 3) {
|
|
CIO_MSG_EVENT(2, "SNID - Device %04x on Subchannel "
|
|
"%04x, lpm %02X, became 'not operational'\n",
|
|
cdev->private->devno, sch->irq, sch->orb.lpm);
|
|
return -EACCES;
|
|
}
|
|
if (cdev->private->pgid.inf.ps.state2 == SNID_STATE2_RESVD_ELSE) {
|
|
CIO_MSG_EVENT(2, "SNID - Device %04x on Subchannel %04x "
|
|
"is reserved by someone else\n",
|
|
cdev->private->devno, sch->irq);
|
|
return -EUSERS;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Got interrupt for Sense Path Group ID.
|
|
*/
|
|
void
|
|
ccw_device_sense_pgid_irq(struct ccw_device *cdev, enum dev_event dev_event)
|
|
{
|
|
struct subchannel *sch;
|
|
struct irb *irb;
|
|
int ret;
|
|
|
|
irb = (struct irb *) __LC_IRB;
|
|
/* Retry sense pgid for cc=1. */
|
|
if (irb->scsw.stctl ==
|
|
(SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) {
|
|
if (irb->scsw.cc == 1) {
|
|
ret = __ccw_device_sense_pgid_start(cdev);
|
|
if (ret && ret != -EBUSY)
|
|
ccw_device_sense_pgid_done(cdev, ret);
|
|
}
|
|
return;
|
|
}
|
|
if (ccw_device_accumulate_and_sense(cdev, irb) != 0)
|
|
return;
|
|
sch = to_subchannel(cdev->dev.parent);
|
|
ret = __ccw_device_check_sense_pgid(cdev);
|
|
memset(&cdev->private->irb, 0, sizeof(struct irb));
|
|
switch (ret) {
|
|
/* 0, -ETIME, -EOPNOTSUPP, -EAGAIN, -EACCES or -EUSERS */
|
|
case 0: /* Sense Path Group ID successful. */
|
|
if (cdev->private->pgid.inf.ps.state1 == SNID_STATE1_RESET)
|
|
memcpy(&cdev->private->pgid, &global_pgid,
|
|
sizeof(struct pgid));
|
|
ccw_device_sense_pgid_done(cdev, 0);
|
|
break;
|
|
case -EOPNOTSUPP: /* Sense Path Group ID not supported */
|
|
ccw_device_sense_pgid_done(cdev, -EOPNOTSUPP);
|
|
break;
|
|
case -ETIME: /* Sense path group id stopped by timeout. */
|
|
ccw_device_sense_pgid_done(cdev, -ETIME);
|
|
break;
|
|
case -EACCES: /* channel is not operational. */
|
|
sch->lpm &= ~cdev->private->imask;
|
|
cdev->private->imask >>= 1;
|
|
cdev->private->iretry = 5;
|
|
/* Fall through. */
|
|
case -EAGAIN: /* Try again. */
|
|
ret = __ccw_device_sense_pgid_start(cdev);
|
|
if (ret != 0 && ret != -EBUSY)
|
|
ccw_device_sense_pgid_done(cdev, -ENODEV);
|
|
break;
|
|
case -EUSERS: /* device is reserved for someone else. */
|
|
ccw_device_sense_pgid_done(cdev, -EUSERS);
|
|
break;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Path Group ID helper function.
|
|
*/
|
|
static int
|
|
__ccw_device_do_pgid(struct ccw_device *cdev, __u8 func)
|
|
{
|
|
struct subchannel *sch;
|
|
struct ccw1 *ccw;
|
|
int ret;
|
|
|
|
sch = to_subchannel(cdev->dev.parent);
|
|
|
|
/* Setup sense path group id channel program. */
|
|
cdev->private->pgid.inf.fc = func;
|
|
ccw = cdev->private->iccws;
|
|
if (!cdev->private->flags.pgid_single) {
|
|
cdev->private->pgid.inf.fc |= SPID_FUNC_MULTI_PATH;
|
|
ccw->cmd_code = CCW_CMD_SUSPEND_RECONN;
|
|
ccw->cda = 0;
|
|
ccw->count = 0;
|
|
ccw->flags = CCW_FLAG_SLI | CCW_FLAG_CC;
|
|
ccw++;
|
|
} else
|
|
cdev->private->pgid.inf.fc |= SPID_FUNC_SINGLE_PATH;
|
|
|
|
ccw->cmd_code = CCW_CMD_SET_PGID;
|
|
ccw->cda = (__u32) __pa (&cdev->private->pgid);
|
|
ccw->count = sizeof (struct pgid);
|
|
ccw->flags = CCW_FLAG_SLI;
|
|
|
|
/* Reset device status. */
|
|
memset(&cdev->private->irb, 0, sizeof(struct irb));
|
|
|
|
/* Try multiple times. */
|
|
ret = -ENODEV;
|
|
if (cdev->private->iretry > 0) {
|
|
cdev->private->iretry--;
|
|
ret = cio_start (sch, cdev->private->iccws,
|
|
cdev->private->imask);
|
|
/* ret is 0, -EBUSY, -EACCES or -ENODEV */
|
|
if ((ret != -EACCES) && (ret != -ENODEV))
|
|
return ret;
|
|
}
|
|
/* PGID command failed on this path. Switch it off. */
|
|
sch->lpm &= ~cdev->private->imask;
|
|
sch->vpm &= ~cdev->private->imask;
|
|
CIO_MSG_EVENT(2, "SPID - Device %04x on Subchannel "
|
|
"%04x, lpm %02X, became 'not operational'\n",
|
|
cdev->private->devno, sch->irq, cdev->private->imask);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Called from interrupt context to check if a valid answer
|
|
* to Set Path Group ID was received.
|
|
*/
|
|
static int
|
|
__ccw_device_check_pgid(struct ccw_device *cdev)
|
|
{
|
|
struct subchannel *sch;
|
|
struct irb *irb;
|
|
|
|
sch = to_subchannel(cdev->dev.parent);
|
|
irb = &cdev->private->irb;
|
|
if (irb->scsw.fctl & (SCSW_FCTL_HALT_FUNC | SCSW_FCTL_CLEAR_FUNC))
|
|
return -ETIME;
|
|
if (irb->esw.esw0.erw.cons) {
|
|
if (irb->ecw[0] & SNS0_CMD_REJECT)
|
|
return -EOPNOTSUPP;
|
|
/* Hmm, whatever happened, try again. */
|
|
CIO_MSG_EVENT(2, "SPID - device %04x, unit check, cnt %02d, "
|
|
"sns : %02X%02X%02X%02X %02X%02X%02X%02X ...\n",
|
|
cdev->private->devno, irb->esw.esw0.erw.scnt,
|
|
irb->ecw[0], irb->ecw[1],
|
|
irb->ecw[2], irb->ecw[3],
|
|
irb->ecw[4], irb->ecw[5],
|
|
irb->ecw[6], irb->ecw[7]);
|
|
return -EAGAIN;
|
|
}
|
|
if (irb->scsw.cc == 3) {
|
|
CIO_MSG_EVENT(2, "SPID - Device %04x on Subchannel "
|
|
"%04x, lpm %02X, became 'not operational'\n",
|
|
cdev->private->devno, sch->irq,
|
|
cdev->private->imask);
|
|
return -EACCES;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void
|
|
__ccw_device_verify_start(struct ccw_device *cdev)
|
|
{
|
|
struct subchannel *sch;
|
|
__u8 imask, func;
|
|
int ret;
|
|
|
|
sch = to_subchannel(cdev->dev.parent);
|
|
while (sch->vpm != sch->lpm) {
|
|
/* Find first unequal bit in vpm vs. lpm */
|
|
for (imask = 0x80; imask != 0; imask >>= 1)
|
|
if ((sch->vpm & imask) != (sch->lpm & imask))
|
|
break;
|
|
cdev->private->imask = imask;
|
|
func = (sch->vpm & imask) ?
|
|
SPID_FUNC_RESIGN : SPID_FUNC_ESTABLISH;
|
|
ret = __ccw_device_do_pgid(cdev, func);
|
|
if (ret == 0 || ret == -EBUSY)
|
|
return;
|
|
cdev->private->iretry = 5;
|
|
}
|
|
ccw_device_verify_done(cdev, (sch->lpm != 0) ? 0 : -ENODEV);
|
|
}
|
|
|
|
/*
|
|
* Got interrupt for Set Path Group ID.
|
|
*/
|
|
void
|
|
ccw_device_verify_irq(struct ccw_device *cdev, enum dev_event dev_event)
|
|
{
|
|
struct subchannel *sch;
|
|
struct irb *irb;
|
|
int ret;
|
|
|
|
irb = (struct irb *) __LC_IRB;
|
|
/* Retry set pgid for cc=1. */
|
|
if (irb->scsw.stctl ==
|
|
(SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) {
|
|
if (irb->scsw.cc == 1)
|
|
__ccw_device_verify_start(cdev);
|
|
return;
|
|
}
|
|
if (ccw_device_accumulate_and_sense(cdev, irb) != 0)
|
|
return;
|
|
sch = to_subchannel(cdev->dev.parent);
|
|
ret = __ccw_device_check_pgid(cdev);
|
|
memset(&cdev->private->irb, 0, sizeof(struct irb));
|
|
switch (ret) {
|
|
/* 0, -ETIME, -EAGAIN, -EOPNOTSUPP or -EACCES */
|
|
case 0:
|
|
/* Establish or Resign Path Group done. Update vpm. */
|
|
if ((sch->lpm & cdev->private->imask) != 0)
|
|
sch->vpm |= cdev->private->imask;
|
|
else
|
|
sch->vpm &= ~cdev->private->imask;
|
|
cdev->private->iretry = 5;
|
|
__ccw_device_verify_start(cdev);
|
|
break;
|
|
case -EOPNOTSUPP:
|
|
/*
|
|
* One of those strange devices which claim to be able
|
|
* to do multipathing but not for Set Path Group ID.
|
|
*/
|
|
if (cdev->private->flags.pgid_single) {
|
|
ccw_device_verify_done(cdev, -EOPNOTSUPP);
|
|
break;
|
|
}
|
|
cdev->private->flags.pgid_single = 1;
|
|
/* fall through. */
|
|
case -EAGAIN: /* Try again. */
|
|
__ccw_device_verify_start(cdev);
|
|
break;
|
|
case -ETIME: /* Set path group id stopped by timeout. */
|
|
ccw_device_verify_done(cdev, -ETIME);
|
|
break;
|
|
case -EACCES: /* channel is not operational. */
|
|
sch->lpm &= ~cdev->private->imask;
|
|
sch->vpm &= ~cdev->private->imask;
|
|
cdev->private->iretry = 5;
|
|
__ccw_device_verify_start(cdev);
|
|
break;
|
|
}
|
|
}
|
|
|
|
void
|
|
ccw_device_verify_start(struct ccw_device *cdev)
|
|
{
|
|
cdev->private->flags.pgid_single = 0;
|
|
cdev->private->iretry = 5;
|
|
__ccw_device_verify_start(cdev);
|
|
}
|
|
|
|
static void
|
|
__ccw_device_disband_start(struct ccw_device *cdev)
|
|
{
|
|
struct subchannel *sch;
|
|
int ret;
|
|
|
|
sch = to_subchannel(cdev->dev.parent);
|
|
while (cdev->private->imask != 0) {
|
|
if (sch->lpm & cdev->private->imask) {
|
|
ret = __ccw_device_do_pgid(cdev, SPID_FUNC_DISBAND);
|
|
if (ret == 0)
|
|
return;
|
|
}
|
|
cdev->private->iretry = 5;
|
|
cdev->private->imask >>= 1;
|
|
}
|
|
ccw_device_verify_done(cdev, (sch->lpm != 0) ? 0 : -ENODEV);
|
|
}
|
|
|
|
/*
|
|
* Got interrupt for Unset Path Group ID.
|
|
*/
|
|
void
|
|
ccw_device_disband_irq(struct ccw_device *cdev, enum dev_event dev_event)
|
|
{
|
|
struct subchannel *sch;
|
|
struct irb *irb;
|
|
int ret;
|
|
|
|
irb = (struct irb *) __LC_IRB;
|
|
/* Retry set pgid for cc=1. */
|
|
if (irb->scsw.stctl ==
|
|
(SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) {
|
|
if (irb->scsw.cc == 1)
|
|
__ccw_device_disband_start(cdev);
|
|
return;
|
|
}
|
|
if (ccw_device_accumulate_and_sense(cdev, irb) != 0)
|
|
return;
|
|
sch = to_subchannel(cdev->dev.parent);
|
|
ret = __ccw_device_check_pgid(cdev);
|
|
memset(&cdev->private->irb, 0, sizeof(struct irb));
|
|
switch (ret) {
|
|
/* 0, -ETIME, -EAGAIN, -EOPNOTSUPP or -EACCES */
|
|
case 0: /* disband successful. */
|
|
sch->vpm = 0;
|
|
ccw_device_disband_done(cdev, ret);
|
|
break;
|
|
case -EOPNOTSUPP:
|
|
/*
|
|
* One of those strange devices which claim to be able
|
|
* to do multipathing but not for Unset Path Group ID.
|
|
*/
|
|
cdev->private->flags.pgid_single = 1;
|
|
/* fall through. */
|
|
case -EAGAIN: /* Try again. */
|
|
__ccw_device_disband_start(cdev);
|
|
break;
|
|
case -ETIME: /* Set path group id stopped by timeout. */
|
|
ccw_device_disband_done(cdev, -ETIME);
|
|
break;
|
|
case -EACCES: /* channel is not operational. */
|
|
cdev->private->imask >>= 1;
|
|
cdev->private->iretry = 5;
|
|
__ccw_device_disband_start(cdev);
|
|
break;
|
|
}
|
|
}
|
|
|
|
void
|
|
ccw_device_disband_start(struct ccw_device *cdev)
|
|
{
|
|
cdev->private->flags.pgid_single = 0;
|
|
cdev->private->iretry = 5;
|
|
cdev->private->imask = 0x80;
|
|
__ccw_device_disband_start(cdev);
|
|
}
|