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This region provides a mechanism to pass a Channel Report Word that affect vfio-ccw devices, and needs to be passed to the guest for its awareness and/or processing. The base driver (see crw_collect_info()) provides space for two CRWs, as a subchannel event may have two CRWs chained together (one for the ssid, one for the subchannel). As vfio-ccw will deal with everything at the subchannel level, provide space for a single CRW to be transferred in one shot. 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: <20200505122745.53208-7-farman@linux.ibm.com> [CH: added padding to ccw_crw_region] Signed-off-by: Cornelia Huck <cohuck@redhat.com>
56 lines
1.2 KiB
C
56 lines
1.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
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/*
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* Interfaces for vfio-ccw
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*
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* Copyright IBM Corp. 2017
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*
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* Author(s): Dong Jia Shi <bjsdjshi@linux.vnet.ibm.com>
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*/
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#ifndef _VFIO_CCW_H_
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#define _VFIO_CCW_H_
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#include <linux/types.h>
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/* used for START SUBCHANNEL, always present */
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struct ccw_io_region {
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#define ORB_AREA_SIZE 12
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__u8 orb_area[ORB_AREA_SIZE];
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#define SCSW_AREA_SIZE 12
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__u8 scsw_area[SCSW_AREA_SIZE];
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#define IRB_AREA_SIZE 96
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__u8 irb_area[IRB_AREA_SIZE];
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__u32 ret_code;
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} __packed;
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/*
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* used for processing commands that trigger asynchronous actions
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* Note: this is controlled by a capability
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*/
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#define VFIO_CCW_ASYNC_CMD_HSCH (1 << 0)
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#define VFIO_CCW_ASYNC_CMD_CSCH (1 << 1)
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struct ccw_cmd_region {
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__u32 command;
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__u32 ret_code;
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} __packed;
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/*
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* Used for processing commands that read the subchannel-information block
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* Reading this region triggers a stsch() to hardware
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* Note: this is controlled by a capability
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*/
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struct ccw_schib_region {
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#define SCHIB_AREA_SIZE 52
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__u8 schib_area[SCHIB_AREA_SIZE];
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} __packed;
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/*
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* Used for returning a Channel Report Word to userspace.
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* Note: this is controlled by a capability
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*/
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struct ccw_crw_region {
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__u32 crw;
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__u32 pad;
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} __packed;
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#endif
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