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vfio-ccw: add handling for async channel instructions

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Add a region to the vfio-ccw device that can be used to submit
asynchronous I/O instructions. ssch continues to be handled by the
existing I/O region; the new region handles hsch and csch.

Interrupt status continues to be reported through the same channels
as for ssch.

Acked-by: Eric Farman <farman@linux.ibm.com>
Reviewed-by: Farhan Ali <alifm@linux.ibm.com>
Signed-off-by: Cornelia Huck <cohuck@redhat.com>
This commit is contained in:
Cornelia Huck 2018-07-23 16:03:27 +02:00
parent b094085737
commit d5afd5d135
8 changed files with 270 additions and 18 deletions
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2
include/uapi/linux/vfio.h
View file

@ -354,6 +354,8 @@ struct vfio_region_gfx_edid {
};
#define VFIO_REGION_TYPE_CCW (2)
/* ccw sub-types */
#define VFIO_REGION_SUBTYPE_CCW_ASYNC_CMD (1)
/*
* 10de vendor sub-type

12
include/uapi/linux/vfio_ccw.h
View file

@ -12,6 +12,7 @@
#include <linux/types.h>
/* used for START SUBCHANNEL, always present */
struct ccw_io_region {
#define ORB_AREA_SIZE 12
__u8 orb_area[ORB_AREA_SIZE];
@ -22,4 +23,15 @@ struct ccw_io_region {
__u32 ret_code;
} __packed;
/*
* used for processing commands that trigger asynchronous actions
* Note: this is controlled by a capability
*/
#define VFIO_CCW_ASYNC_CMD_HSCH (1 << 0)
#define VFIO_CCW_ASYNC_CMD_CSCH (1 << 1)
struct ccw_cmd_region {
__u32 command;
__u32 ret_code;
} __packed;
#endif