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[S390] cio: notify drivers of channel path events

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This patch adds a notification mechanism to inform ccw drivers
about changes to channel paths, which occured while the device
is online.

Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Sebastian Ott
2010-10-25 16:10:34 +02:00
zatwierdzone przez Martin Schwidefsky
rodzic eb4f5d93d7
commit 585b954e1f
5 zmienionych plików z 75 dodań i 8 usunięć
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32
drivers/s390/cio/device_fsm.c
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@@ -349,9 +349,13 @@ out:
static void ccw_device_oper_notify(struct ccw_device *cdev)
{
struct subchannel *sch = to_subchannel(cdev->dev.parent);
if (ccw_device_notify(cdev, CIO_OPER) == NOTIFY_OK) {
/* Reenable channel measurements, if needed. */
ccw_device_sched_todo(cdev, CDEV_TODO_ENABLE_CMF);
/* Save indication for new paths. */
cdev->private->path_new_mask = sch->vpm;
return;
}
/* Driver doesn't want device back. */
@@ -462,6 +466,32 @@ static void ccw_device_request_event(struct ccw_device *cdev, enum dev_event e)
}
}
static void ccw_device_report_path_events(struct ccw_device *cdev)
{
struct subchannel *sch = to_subchannel(cdev->dev.parent);
int path_event[8];
int chp, mask;
for (chp = 0, mask = 0x80; chp < 8; chp++, mask >>= 1) {
path_event[chp] = PE_NONE;
if (mask & cdev->private->path_gone_mask & ~(sch->vpm))
path_event[chp] |= PE_PATH_GONE;
if (mask & cdev->private->path_new_mask & sch->vpm)
path_event[chp] |= PE_PATH_AVAILABLE;
if (mask & cdev->private->pgid_reset_mask & sch->vpm)
path_event[chp] |= PE_PATHGROUP_ESTABLISHED;
}
if (cdev->online && cdev->drv->path_event)
cdev->drv->path_event(cdev, path_event);
}
static void ccw_device_reset_path_events(struct ccw_device *cdev)
{
cdev->private->path_gone_mask = 0;
cdev->private->path_new_mask = 0;
cdev->private->pgid_reset_mask = 0;
}
void
ccw_device_verify_done(struct ccw_device *cdev, int err)
{
@@ -498,6 +528,7 @@ callback:
&cdev->private->irb);
memset(&cdev->private->irb, 0, sizeof(struct irb));
}
ccw_device_report_path_events(cdev);
break;
case -ETIME:
case -EUSERS:
@@ -516,6 +547,7 @@ callback:
ccw_device_done(cdev, DEV_STATE_NOT_OPER);
break;
}
ccw_device_reset_path_events(cdev);
}
/*