mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-12 03:26:50 +07:00
19c1c5a64c
Based on patch by Cornelia Huck.
Note: for consistency, and to avoid sparse errors,
convert all fields, even those no longer in use
for virtio v1.0.
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
137 lines
4.8 KiB
C
137 lines
4.8 KiB
C
#ifndef _LINUX_VIRTIO_BLK_H
|
|
#define _LINUX_VIRTIO_BLK_H
|
|
/* This header is BSD licensed so anyone can use the definitions to implement
|
|
* compatible drivers/servers.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. Neither the name of IBM nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL IBM OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE. */
|
|
#include <linux/types.h>
|
|
#include <linux/virtio_ids.h>
|
|
#include <linux/virtio_config.h>
|
|
#include <linux/virtio_types.h>
|
|
|
|
/* Feature bits */
|
|
#define VIRTIO_BLK_F_BARRIER 0 /* Does host support barriers? */
|
|
#define VIRTIO_BLK_F_SIZE_MAX 1 /* Indicates maximum segment size */
|
|
#define VIRTIO_BLK_F_SEG_MAX 2 /* Indicates maximum # of segments */
|
|
#define VIRTIO_BLK_F_GEOMETRY 4 /* Legacy geometry available */
|
|
#define VIRTIO_BLK_F_RO 5 /* Disk is read-only */
|
|
#define VIRTIO_BLK_F_BLK_SIZE 6 /* Block size of disk is available*/
|
|
#define VIRTIO_BLK_F_SCSI 7 /* Supports scsi command passthru */
|
|
#define VIRTIO_BLK_F_WCE 9 /* Writeback mode enabled after reset */
|
|
#define VIRTIO_BLK_F_TOPOLOGY 10 /* Topology information is available */
|
|
#define VIRTIO_BLK_F_CONFIG_WCE 11 /* Writeback mode available in config */
|
|
#define VIRTIO_BLK_F_MQ 12 /* support more than one vq */
|
|
|
|
#ifndef __KERNEL__
|
|
/* Old (deprecated) name for VIRTIO_BLK_F_WCE. */
|
|
#define VIRTIO_BLK_F_FLUSH VIRTIO_BLK_F_WCE
|
|
#endif
|
|
|
|
#define VIRTIO_BLK_ID_BYTES 20 /* ID string length */
|
|
|
|
struct virtio_blk_config {
|
|
/* The capacity (in 512-byte sectors). */
|
|
__u64 capacity;
|
|
/* The maximum segment size (if VIRTIO_BLK_F_SIZE_MAX) */
|
|
__u32 size_max;
|
|
/* The maximum number of segments (if VIRTIO_BLK_F_SEG_MAX) */
|
|
__u32 seg_max;
|
|
/* geometry the device (if VIRTIO_BLK_F_GEOMETRY) */
|
|
struct virtio_blk_geometry {
|
|
__u16 cylinders;
|
|
__u8 heads;
|
|
__u8 sectors;
|
|
} geometry;
|
|
|
|
/* block size of device (if VIRTIO_BLK_F_BLK_SIZE) */
|
|
__u32 blk_size;
|
|
|
|
/* the next 4 entries are guarded by VIRTIO_BLK_F_TOPOLOGY */
|
|
/* exponent for physical block per logical block. */
|
|
__u8 physical_block_exp;
|
|
/* alignment offset in logical blocks. */
|
|
__u8 alignment_offset;
|
|
/* minimum I/O size without performance penalty in logical blocks. */
|
|
__u16 min_io_size;
|
|
/* optimal sustained I/O size in logical blocks. */
|
|
__u32 opt_io_size;
|
|
|
|
/* writeback mode (if VIRTIO_BLK_F_CONFIG_WCE) */
|
|
__u8 wce;
|
|
__u8 unused;
|
|
|
|
/* number of vqs, only available when VIRTIO_BLK_F_MQ is set */
|
|
__u16 num_queues;
|
|
} __attribute__((packed));
|
|
|
|
/*
|
|
* Command types
|
|
*
|
|
* Usage is a bit tricky as some bits are used as flags and some are not.
|
|
*
|
|
* Rules:
|
|
* VIRTIO_BLK_T_OUT may be combined with VIRTIO_BLK_T_SCSI_CMD or
|
|
* VIRTIO_BLK_T_BARRIER. VIRTIO_BLK_T_FLUSH is a command of its own
|
|
* and may not be combined with any of the other flags.
|
|
*/
|
|
|
|
/* These two define direction. */
|
|
#define VIRTIO_BLK_T_IN 0
|
|
#define VIRTIO_BLK_T_OUT 1
|
|
|
|
/* This bit says it's a scsi command, not an actual read or write. */
|
|
#define VIRTIO_BLK_T_SCSI_CMD 2
|
|
|
|
/* Cache flush command */
|
|
#define VIRTIO_BLK_T_FLUSH 4
|
|
|
|
/* Get device ID command */
|
|
#define VIRTIO_BLK_T_GET_ID 8
|
|
|
|
/* Barrier before this op. */
|
|
#define VIRTIO_BLK_T_BARRIER 0x80000000
|
|
|
|
/* This is the first element of the read scatter-gather list. */
|
|
struct virtio_blk_outhdr {
|
|
/* VIRTIO_BLK_T* */
|
|
__virtio32 type;
|
|
/* io priority. */
|
|
__virtio32 ioprio;
|
|
/* Sector (ie. 512 byte offset) */
|
|
__virtio64 sector;
|
|
};
|
|
|
|
struct virtio_scsi_inhdr {
|
|
__virtio32 errors;
|
|
__virtio32 data_len;
|
|
__virtio32 sense_len;
|
|
__virtio32 residual;
|
|
};
|
|
|
|
/* And this is the final byte of the write scatter-gather list. */
|
|
#define VIRTIO_BLK_S_OK 0
|
|
#define VIRTIO_BLK_S_IOERR 1
|
|
#define VIRTIO_BLK_S_UNSUPP 2
|
|
#endif /* _LINUX_VIRTIO_BLK_H */
|