linux-headers/linux/vfio_ccw.h

   1 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
   2 /*
   3  * Interfaces for vfio-ccw
   4  *
   5  * Copyright IBM Corp. 2017
   6  *
   7  * Author(s): Dong Jia Shi <bjsdjshi@linux.vnet.ibm.com>
   8  */
   9
  10 #ifndef _VFIO_CCW_H_
  11 #define _VFIO_CCW_H_
  12
  13 #include <linux/types.h>
  14
  15 /* used for START SUBCHANNEL, always present */
  16 struct ccw_io_region {
  17 #define ORB_AREA_SIZE 12
  18         __u8    orb_area[ORB_AREA_SIZE];
  19 #define SCSW_AREA_SIZE 12
  20         __u8    scsw_area[SCSW_AREA_SIZE];
  21 #define IRB_AREA_SIZE 96
  22         __u8    irb_area[IRB_AREA_SIZE];
  23         __u32   ret_code;
  24 } __attribute__((packed));
  25
  26 /*
  27  * used for processing commands that trigger asynchronous actions
  28  * Note: this is controlled by a capability
  29  */
  30 #define VFIO_CCW_ASYNC_CMD_HSCH (1 << 0)
  31 #define VFIO_CCW_ASYNC_CMD_CSCH (1 << 1)
  32 struct ccw_cmd_region {
  33         __u32 command;
  34         __u32 ret_code;
  35 } __attribute__((packed));
  36
  37 /*
  38  * Used for processing commands that read the subchannel-information block
  39  * Reading this region triggers a stsch() to hardware
  40  * Note: this is controlled by a capability
  41  */
  42 struct ccw_schib_region {
  43 #define SCHIB_AREA_SIZE 52
  44         __u8 schib_area[SCHIB_AREA_SIZE];
  45 } __attribute__((packed));
  46
  47 /*
  48  * Used for returning a Channel Report Word to userspace.
  49  * Note: this is controlled by a capability
  50  */
  51 struct ccw_crw_region {
  52         __u32 crw;
  53         __u32 pad;
  54 } __attribute__((packed));
  55
  56 #endif