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vfio-ccw: Register a chp_event callback for vfio-ccw

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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>
This commit is contained in:
Farhan Ali 2020-05-05 14:27:39 +02:00 committed by Cornelia Huck
parent 9a44ce6c9b
commit b7701dfbf9
1 changed files with 47 additions and 0 deletions
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47
drivers/s390/cio/vfio_ccw_drv.c
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@ -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 @@ 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;
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)