From 24c986748ba670c903a9d6a11ee96de2b3f5f1b8 Mon Sep 17 00:00:00 2001 From: Farhan Ali Date: Tue, 5 May 2020 14:27:41 +0200 Subject: vfio-ccw: Introduce a new schib region 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 Signed-off-by: Eric Farman Reviewed-by: Cornelia Huck Message-Id: <20200505122745.53208-5-farman@linux.ibm.com> Signed-off-by: Cornelia Huck --- include/uapi/linux/vfio_ccw.h | 10 ++++++++++ 1 file changed, 10 insertions(+) (limited to 'include/uapi/linux/vfio_ccw.h') diff --git a/include/uapi/linux/vfio_ccw.h b/include/uapi/linux/vfio_ccw.h index cbecbf0cd54f..758bf214898d 100644 --- a/include/uapi/linux/vfio_ccw.h +++ b/include/uapi/linux/vfio_ccw.h @@ -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 -- cgit v1.2.3