| Path : /usr/include/linux/ |
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| Current File : //usr/include/linux/vfio_ccw.h |
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
/*
* Interfaces for vfio-ccw
*
* Copyright IBM Corp. 2017
*
* Author(s): Dong Jia Shi <bjsdjshi@linux.vnet.ibm.com>
*/
#ifndef _VFIO_CCW_H_
#define _VFIO_CCW_H_
#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];
#define SCSW_AREA_SIZE 12
__u8 scsw_area[SCSW_AREA_SIZE];
#define IRB_AREA_SIZE 96
__u8 irb_area[IRB_AREA_SIZE];
__u32 ret_code;
} __attribute__((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;
} __attribute__((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];
} __attribute__((packed));
/*
* Used for returning a Channel Report Word to userspace.
* Note: this is controlled by a capability
*/
struct ccw_crw_region {
__u32 crw;
__u32 pad;
} __attribute__((packed));
#endif