s390/cio: dont abort verification after missing irq
Do not abort path verification when waiting for an interrupt timed out.
Use path_noirq_mask to keep track of the paths used for this (also
maintain a path_notoper_mask for debugging purposes). If the timeout
happend to be during an operation where we query or alter the state of
path groups set the pgid_unknown flag.
With this change we allow usage of devices which have such ill-behaved
paths (if at least one path is operational).
Reviewed-by: Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
diff --git a/drivers/s390/cio/device_pgid.c b/drivers/s390/cio/device_pgid.c
index 908d287..6f2987d8 100644
--- a/drivers/s390/cio/device_pgid.c
+++ b/drivers/s390/cio/device_pgid.c
@@ -102,10 +102,20 @@
struct subchannel *sch = to_subchannel(cdev->dev.parent);
struct ccw_request *req = &cdev->private->req;
- if (rc == 0)
+ switch (rc) {
+ case 0:
sch->vpm |= req->lpm;
- else if (rc != -EACCES)
+ break;
+ case -ETIME:
+ cdev->private->path_noirq_mask |= req->lpm;
+ break;
+ case -EACCES:
+ cdev->private->path_notoper_mask |= req->lpm;
+ break;
+ default:
goto err;
+ }
+ /* Continue on the next path. */
req->lpm >>= 1;
nop_do(cdev);
return;
@@ -174,7 +184,12 @@
case 0:
sch->vpm |= req->lpm & sch->opm;
break;
+ case -ETIME:
+ cdev->private->flags.pgid_unknown = 1;
+ cdev->private->path_noirq_mask |= req->lpm;
+ break;
case -EACCES:
+ cdev->private->path_notoper_mask |= req->lpm;
break;
case -EOPNOTSUPP:
if (cdev->private->flags.mpath) {
@@ -404,10 +419,21 @@
{
struct ccw_request *req = &cdev->private->req;
- if (rc == 0)
+ switch (rc) {
+ case 0:
cdev->private->pgid_valid_mask |= req->lpm;
- else if (rc != -EACCES)
+ break;
+ case -ETIME:
+ cdev->private->flags.pgid_unknown = 1;
+ cdev->private->path_noirq_mask |= req->lpm;
+ break;
+ case -EACCES:
+ cdev->private->path_notoper_mask |= req->lpm;
+ break;
+ default:
goto err;
+ }
+ /* Continue on the next path. */
req->lpm >>= 1;
snid_do(cdev);
return;
@@ -427,6 +453,13 @@
sch->vpm = 0;
sch->lpm = sch->schib.pmcw.pam;
+
+ /* Initialize PGID data. */
+ memset(cdev->private->pgid, 0, sizeof(cdev->private->pgid));
+ cdev->private->pgid_valid_mask = 0;
+ cdev->private->pgid_todo_mask = sch->schib.pmcw.pam;
+ cdev->private->path_notoper_mask = 0;
+
/* Initialize request data. */
memset(req, 0, sizeof(*req));
req->timeout = PGID_TIMEOUT;
@@ -459,14 +492,8 @@
*/
void ccw_device_verify_start(struct ccw_device *cdev)
{
- struct subchannel *sch = to_subchannel(cdev->dev.parent);
-
CIO_TRACE_EVENT(4, "vrfy");
CIO_HEX_EVENT(4, &cdev->private->dev_id, sizeof(cdev->private->dev_id));
- /* Initialize PGID data. */
- memset(cdev->private->pgid, 0, sizeof(cdev->private->pgid));
- cdev->private->pgid_valid_mask = 0;
- cdev->private->pgid_todo_mask = sch->schib.pmcw.pam;
/*
* Initialize pathgroup and multipath state with target values.
* They may change in the course of path verification.
@@ -474,6 +501,7 @@
cdev->private->flags.pgroup = cdev->private->options.pgroup;
cdev->private->flags.mpath = cdev->private->options.mpath;
cdev->private->flags.doverify = 0;
+ cdev->private->path_noirq_mask = 0;
verify_start(cdev);
}
diff --git a/drivers/s390/cio/io_sch.h b/drivers/s390/cio/io_sch.h
index 76253df..b108f4a 100644
--- a/drivers/s390/cio/io_sch.h
+++ b/drivers/s390/cio/io_sch.h
@@ -126,6 +126,10 @@
u8 pgid_valid_mask; /* mask of valid PGIDs */
u8 pgid_todo_mask; /* mask of PGIDs to be adjusted */
u8 pgid_reset_mask; /* mask of PGIDs which were reset */
+ u8 path_noirq_mask; /* mask of paths for which no irq was
+ received */
+ u8 path_notoper_mask; /* mask of paths which were found
+ not operable */
u8 path_gone_mask; /* mask of paths, that became unavailable */
u8 path_new_mask; /* mask of paths, that became available */
struct {
@@ -145,6 +149,7 @@
unsigned int resuming:1; /* recognition while resume */
unsigned int pgroup:1; /* pathgroup is set up */
unsigned int mpath:1; /* multipathing is set up */
+ unsigned int pgid_unknown:1;/* unknown pgid state */
unsigned int initialized:1; /* set if initial reference held */
} __attribute__((packed)) flags;
unsigned long intparm; /* user interruption parameter */