From: Farhan Ali <alifm@xxxxxxxxxxxxx>
Register the chp_event callback to receive channel path related
events for the subchannels managed by vfio-ccw.
Signed-off-by: Farhan Ali <alifm@xxxxxxxxxxxxx>
Signed-off-by: Eric Farman <farman@xxxxxxxxxxxxx>
---
Notes:
v0->v1: [EF]
- Add s390dbf trace
drivers/s390/cio/vfio_ccw_drv.c | 44 +++++++++++++++++++++++++++++++++
1 file changed, 44 insertions(+)
diff --git a/drivers/s390/cio/vfio_ccw_drv.c b/drivers/s390/cio/vfio_ccw_drv.c
index 91989269faf1..05da1facee60 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"
@@ -257,6 +258,48 @@ static int vfio_ccw_sch_event(struct subchannel *sch, int process)
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;
+
+ if (cio_update_schib(sch))
+ return -ENODEV;
+
+ 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);
+
+ switch (event) {
+ case CHP_VARY_OFF:
+ /* Path logically turned off */
+ sch->opm &= ~mask;
+ sch->lpm &= ~mask;
+ break;
+ case CHP_OFFLINE:
+ /* Path is gone */
+ 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 */ },
@@ -274,6 +317,7 @@ 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)
--
2.17.1
