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vfio-ccw: Introduce a new schib region

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The schib region can be used by userspace to get the subchannel-
information block (SCHIB) for the passthrough subchannel.
This can be useful to get information such as channel path
information via the SCHIB.PMCW fields.

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: <20200505122745.53208-5-farman@linux.ibm.com>
Signed-off-by: Cornelia Huck <cohuck@redhat.com>
This commit is contained in:
Farhan Ali
2020-05-05 14:27:41 +02:00
committed by Cornelia Huck
parent 600279b526
commit 24c986748b
8 changed files with 140 additions and 4 deletions
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10
include/uapi/linux/vfio_ccw.h
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@@ -34,4 +34,14 @@ struct ccw_cmd_region {
__u32 ret_code;
} __packed;
/*
* Used for processing commands that read the subchannel-information block
* Reading this region triggers a stsch() to hardware
* Note: this is controlled by a capability
*/
struct ccw_schib_region {
#define SCHIB_AREA_SIZE 52
__u8 schib_area[SCHIB_AREA_SIZE];
} __packed;
#endif