* Path Group ID functions.
*/
+#include <linux/config.h>
#include <linux/module.h>
#include <linux/init.h>
#include "device.h"
#include "ioasm.h"
-/*
- * Helper function called from interrupt context to decide whether an
- * operation should be tried again.
- */
-static int __ccw_device_should_retry(struct scsw *scsw)
-{
- /* CC is only valid if start function bit is set. */
- if ((scsw->fctl & SCSW_FCTL_START_FUNC) && scsw->cc == 1)
- return 1;
- /* No more activity. For sense and set PGID we stubbornly try again. */
- if (!scsw->actl)
- return 1;
- return 0;
-}
-
/*
* Start Sense Path Group ID helper function. Used in ccw_device_recog
* and ccw_device_sense_pgid.
struct subchannel *sch;
struct ccw1 *ccw;
int ret;
- int i;
sch = to_subchannel(cdev->dev.parent);
- /* Return if we already checked on all paths. */
- if (cdev->private->imask == 0)
- return (sch->lpm == 0) ? -ENODEV : -EACCES;
- i = 8 - ffs(cdev->private->imask);
-
/* 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;
ret = -ENODEV;
while (cdev->private->imask != 0) {
/* Try every path multiple times. */
- ccw->cda = (__u32) __pa (&cdev->private->pgid[i]);
if (cdev->private->iretry > 0) {
cdev->private->iretry--;
ret = cio_start (sch, cdev->private->iccws,
}
cdev->private->imask >>= 1;
cdev->private->iretry = 5;
- i++;
}
-
return ret;
}
cdev->private->state = DEV_STATE_SENSE_PGID;
cdev->private->imask = 0x80;
cdev->private->iretry = 5;
- memset (&cdev->private->pgid, 0, sizeof (cdev->private->pgid));
+ 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);
{
struct subchannel *sch;
struct irb *irb;
- int i;
sch = to_subchannel(cdev->dev.parent);
irb = &cdev->private->irb;
sch->schid.sch_no, sch->orb.lpm);
return -EACCES;
}
- i = 8 - ffs(cdev->private->imask);
- if (cdev->private->pgid[i].inf.ps.state2 == SNID_STATE2_RESVD_ELSE) {
+ if (cdev->private->pgid.inf.ps.state2 == SNID_STATE2_RESVD_ELSE) {
CIO_MSG_EVENT(2, "SNID - Device %04x on Subchannel 0.%x.%04x "
"is reserved by someone else\n",
cdev->private->devno, sch->schid.ssid,
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 (__ccw_device_should_retry(&irb->scsw)) {
+ if (irb->scsw.cc == 1) {
ret = __ccw_device_sense_pgid_start(cdev);
if (ret && ret != -EBUSY)
ccw_device_sense_pgid_done(cdev, ret);
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, &css[0]->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;
break;
case -EACCES: /* channel is not operational. */
sch->lpm &= ~cdev->private->imask;
- /* Fall through. */
- case 0: /* Sense Path Group ID successful. */
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, ret);
+ ccw_device_sense_pgid_done(cdev, -ENODEV);
break;
case -EUSERS: /* device is reserved for someone else. */
ccw_device_sense_pgid_done(cdev, -EUSERS);
sch = to_subchannel(cdev->dev.parent);
/* Setup sense path group id channel program. */
- cdev->private->pgid[0].inf.fc = func;
+ cdev->private->pgid.inf.fc = func;
ccw = cdev->private->iccws;
if (!cdev->private->flags.pgid_single) {
- cdev->private->pgid[0].inf.fc |= SPID_FUNC_MULTI_PATH;
+ 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[0].inf.fc |= SPID_FUNC_SINGLE_PATH;
+ cdev->private->pgid.inf.fc |= SPID_FUNC_SINGLE_PATH;
ccw->cmd_code = CCW_CMD_SET_PGID;
- ccw->cda = (__u32) __pa (&cdev->private->pgid[0]);
+ ccw->cda = (__u32) __pa (&cdev->private->pgid);
ccw->count = sizeof (struct pgid);
ccw->flags = CCW_FLAG_SLI;
return ret;
}
-/*
- * Helper function to send a nop ccw down a path.
- */
-static int __ccw_device_do_nop(struct ccw_device *cdev)
-{
- struct subchannel *sch;
- struct ccw1 *ccw;
- int ret;
-
- sch = to_subchannel(cdev->dev.parent);
-
- /* Setup nop channel program. */
- ccw = cdev->private->iccws;
- ccw->cmd_code = CCW_CMD_NOOP;
- ccw->cda = 0;
- ccw->count = 0;
- 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;
- }
- /* nop command failed on this path. Switch it off. */
- sch->lpm &= ~cdev->private->imask;
- sch->vpm &= ~cdev->private->imask;
- CIO_MSG_EVENT(2, "NOP - Device %04x on Subchannel "
- "0.%x.%04x, lpm %02X, became 'not operational'\n",
- cdev->private->devno, sch->schid.ssid,
- sch->schid.sch_no, cdev->private->imask);
- return ret;
-}
-
-
/*
* Called from interrupt context to check if a valid answer
* to Set Path Group ID was received.
return 0;
}
-/*
- * Called from interrupt context to check the path status after a nop has
- * been send.
- */
-static int __ccw_device_check_nop(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->scsw.cc == 3) {
- CIO_MSG_EVENT(2, "NOP - Device %04x on Subchannel 0.%x.%04x,"
- " lpm %02X, became 'not operational'\n",
- cdev->private->devno, sch->schid.ssid,
- sch->schid.sch_no, cdev->private->imask);
- return -EACCES;
- }
- return 0;
-}
-
static void
__ccw_device_verify_start(struct ccw_device *cdev)
{
if ((sch->vpm & imask) != (sch->lpm & imask))
break;
cdev->private->imask = imask;
- if (cdev->private->options.pgroup) {
- func = (sch->vpm & imask) ?
- SPID_FUNC_RESIGN : SPID_FUNC_ESTABLISH;
- ret = __ccw_device_do_pgid(cdev, func);
- } else
- ret = __ccw_device_do_nop(cdev);
+ 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;
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 (__ccw_device_should_retry(&irb->scsw))
+ 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);
- if (cdev->private->options.pgroup)
- ret = __ccw_device_check_pgid(cdev);
- else
- ret = __ccw_device_check_nop(cdev);
+ ret = __ccw_device_check_pgid(cdev);
memset(&cdev->private->irb, 0, sizeof(struct irb));
switch (ret) {
/* 0, -ETIME, -EAGAIN, -EOPNOTSUPP or -EACCES */
* 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)
- cdev->private->options.pgroup = 0;
- else
- cdev->private->flags.pgid_single = 1;
+ 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);
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 (__ccw_device_should_retry(&irb->scsw))
+ if (irb->scsw.cc == 1)
__ccw_device_disband_start(cdev);
return;
}
git://git.onelab.eu / linux-2.6.git / blobdiff