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| author |   Farhan Ali <alifm@linux.ibm.com> | 2020-05-05 14:27:39 +0200 |
|---|---|---|
| committer |   Cornelia Huck <cohuck@redhat.com> | 2020-06-02 13:14:08 +0200 |
| commit | b7701dfbf98327f34966a68c2532730353245d7b (patch) | |
| tree | c343f35a2766ef0320ac7f397f09ed9a85b76426 /drivers/s390 | |
| parent | vfio-ccw: Introduce new helper functions to free/destroy regions (diff) | |
| download | linux-dev-b7701dfbf98327f34966a68c2532730353245d7b.tar.xz linux-dev-b7701dfbf98327f34966a68c2532730353245d7b.zip | |
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.c | 47 |
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) |