aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/s390
diff options
context:
space:
mode:
authorFarhan Ali <alifm@linux.ibm.com>2020-05-05 14:27:39 +0200
committerCornelia Huck <cohuck@redhat.com>2020-06-02 13:14:08 +0200
commitb7701dfbf98327f34966a68c2532730353245d7b (patch)
treec343f35a2766ef0320ac7f397f09ed9a85b76426 /drivers/s390
parent9a44ce6c9b69e15c87c87ef1f1a6972837cff3db (diff)
vfio-ccw: Register a chp_event callback for vfio-ccw
Register the chp_event callback to receive channel path related events for the subchannels managed by vfio-ccw. Signed-off-by: Farhan Ali <alifm@linux.ibm.com> Signed-off-by: Eric Farman <farman@linux.ibm.com> Reviewed-by: Cornelia Huck <cohuck@redhat.com> Message-Id: <20200505122745.53208-3-farman@linux.ibm.com> Signed-off-by: Cornelia Huck <cohuck@redhat.com>
Diffstat (limited to 'drivers/s390')
-rw-r--r--drivers/s390/cio/vfio_ccw_drv.c47
1 files changed, 47 insertions, 0 deletions
diff --git a/drivers/s390/cio/vfio_ccw_drv.c b/drivers/s390/cio/vfio_ccw_drv.c
index 8715c1c2f1e1..fb1275a7d1f5 100644
--- a/drivers/s390/cio/vfio_ccw_drv.c
+++ b/drivers/s390/cio/vfio_ccw_drv.c
@@ -19,6 +19,7 @@
#include <asm/isc.h>
+#include "chp.h"
#include "ioasm.h"
#include "css.h"
#include "vfio_ccw_private.h"
@@ -262,6 +263,51 @@ out_unlock:
return rc;
}
+static int vfio_ccw_chp_event(struct subchannel *sch,
+ struct chp_link *link, int event)
+{
+ struct vfio_ccw_private *private = dev_get_drvdata(&sch->dev);
+ int mask = chp_ssd_get_mask(&sch->ssd_info, link);
+ int retry = 255;
+
+ if (!private || !mask)
+ return 0;
+
+ VFIO_CCW_MSG_EVENT(2, "%pUl (%x.%x.%04x): mask=0x%x event=%d\n",
+ mdev_uuid(private->mdev), sch->schid.cssid,
+ sch->schid.ssid, sch->schid.sch_no,
+ mask, event);
+
+ if (cio_update_schib(sch))
+ return -ENODEV;
+
+ switch (event) {
+ case CHP_VARY_OFF:
+ /* Path logically turned off */
+ sch->opm &= ~mask;
+ sch->lpm &= ~mask;
+ if (sch->schib.pmcw.lpum & mask)
+ cio_cancel_halt_clear(sch, &retry);
+ break;
+ case CHP_OFFLINE:
+ /* Path is gone */
+ if (sch->schib.pmcw.lpum & mask)
+ cio_cancel_halt_clear(sch, &retry);
+ break;
+ case CHP_VARY_ON:
+ /* Path logically turned on */
+ sch->opm |= mask;
+ sch->lpm |= mask;
+ break;
+ case CHP_ONLINE:
+ /* Path became available */
+ sch->lpm |= mask & sch->opm;
+ break;
+ }
+
+ return 0;
+}
+
static struct css_device_id vfio_ccw_sch_ids[] = {
{ .match_flags = 0x1, .type = SUBCHANNEL_TYPE_IO, },
{ /* end of list */ },
@@ -279,6 +325,7 @@ static struct css_driver vfio_ccw_sch_driver = {
.remove = vfio_ccw_sch_remove,
.shutdown = vfio_ccw_sch_shutdown,
.sch_event = vfio_ccw_sch_event,
+ .chp_event = vfio_ccw_chp_event,
};
static int __init vfio_ccw_debug_init(void)

Privacy Policy