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vfio-ccw: support async command subregion

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A vfio-ccw device may provide an async command subregion for
issuing halt/clear subchannel requests. If it is present, use
it for sending halt/clear request to the device; if not, fall
back to emulation (as done today).

Reviewed-by: Farhan Ali <alifm@linux.ibm.com>
Message-Id: <20190613092542.2834-1-cohuck@redhat.com>
Reviewed-by: Eric Farman <farman@linux.ibm.com>
Signed-off-by: Cornelia Huck <cohuck@redhat.com>
This commit is contained in:
Cornelia Huck 2019-05-07 17:47:33 +02:00
parent b5e89f044d
commit 8fadea24de
5 changed files with 159 additions and 6 deletions
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27
hw/s390x/css.c
View file

@ -22,6 +22,7 @@
#include "trace.h"
#include "hw/s390x/s390_flic.h"
#include "hw/s390x/s390-virtio-ccw.h"
#include "hw/s390x/s390-ccw.h"
typedef struct CrwContainer {
CRW crw;
@ -1205,6 +1206,26 @@ static void sch_handle_start_func_virtual(SubchDev *sch)
}
static void sch_handle_halt_func_passthrough(SubchDev *sch)
{
int ret;
ret = s390_ccw_halt(sch);
if (ret == -ENOSYS) {
sch_handle_halt_func(sch);
}
}
static void sch_handle_clear_func_passthrough(SubchDev *sch)
{
int ret;
ret = s390_ccw_clear(sch);
if (ret == -ENOSYS) {
sch_handle_clear_func(sch);
}
}
static IOInstEnding sch_handle_start_func_passthrough(SubchDev *sch)
{
SCHIB *schib = &sch->curr_status;
@ -1244,11 +1265,9 @@ IOInstEnding do_subchannel_work_passthrough(SubchDev *sch)
SCHIB *schib = &sch->curr_status;
if (schib->scsw.ctrl & SCSW_FCTL_CLEAR_FUNC) {
/* TODO: Clear handling */
sch_handle_clear_func(sch);
sch_handle_clear_func_passthrough(sch);
} else if (schib->scsw.ctrl & SCSW_FCTL_HALT_FUNC) {
/* TODO: Halt handling */
sch_handle_halt_func(sch);
sch_handle_halt_func_passthrough(sch);
} else if (schib->scsw.ctrl & SCSW_FCTL_START_FUNC) {
return sch_handle_start_func_passthrough(sch);
}