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#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_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_TOPOLOGY 10 /* Topology information is available */
#define VIRTIO_BLK_F_MQ 12 /* support more than one vq */
#define VIRTIO_BLK_F_DISCARD 13 /* DISCARD is supported */
#define VIRTIO_BLK_F_WRITE_ZEROES 14 /* WRITE ZEROES is supported */
#define VIRTIO_BLK_F_SECURE_ERASE 16 /* Secure Erase is supported */
#define VIRTIO_BLK_F_ZONED 17 /* Zoned block device */
/* Legacy feature bits */
#ifndef VIRTIO_BLK_NO_LEGACY
#define VIRTIO_BLK_F_BARRIER 0 /* Does host support barriers? */
#define VIRTIO_BLK_F_SCSI 7 /* Supports scsi command passthru */
#define VIRTIO_BLK_F_FLUSH 9 /* Flush command supported */
#define VIRTIO_BLK_F_CONFIG_WCE 11 /* Writeback mode available in config */
#ifndef __KERNEL__
/* Old (deprecated) name for VIRTIO_BLK_F_FLUSH. */
#define VIRTIO_BLK_F_WCE VIRTIO_BLK_F_FLUSH
#endif
#endif /* !VIRTIO_BLK_NO_LEGACY */
#define VIRTIO_BLK_ID_BYTES 20 /* ID string length */
struct virtio_blk_config {
/* The capacity (in 512-byte sectors). */
__virtio64 capacity;
/* The maximum segment size (if VIRTIO_BLK_F_SIZE_MAX) */
__virtio32 size_max;
/* The maximum number of segments (if VIRTIO_BLK_F_SEG_MAX) */
__virtio32 seg_max;
/* geometry of the device (if VIRTIO_BLK_F_GEOMETRY) */
struct virtio_blk_geometry {
__virtio16 cylinders;
__u8 heads;
__u8 sectors;
} geometry;
/* block size of device (if VIRTIO_BLK_F_BLK_SIZE) */
__virtio32 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. */
__virtio16 min_io_size;
/* optimal sustained I/O size in logical blocks. */
__virtio32 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 */
__virtio16 num_queues;
/* the next 3 entries are guarded by VIRTIO_BLK_F_DISCARD */
/*
* The maximum discard sectors (in 512-byte sectors) for
* one segment.
*/
__virtio32 max_discard_sectors;
/*
* The maximum number of discard segments in a
* discard command.
*/
__virtio32 max_discard_seg;
/* Discard commands must be aligned to this number of sectors. */
__virtio32 discard_sector_alignment;
/* the next 3 entries are guarded by VIRTIO_BLK_F_WRITE_ZEROES */
/*
* The maximum number of write zeroes sectors (in 512-byte sectors) in
* one segment.
*/
__virtio32 max_write_zeroes_sectors;
/*
* The maximum number of segments in a write zeroes
* command.
*/
__virtio32 max_write_zeroes_seg;
/*
* Set if a VIRTIO_BLK_T_WRITE_ZEROES request may result in the
* deallocation of one or more of the sectors.
*/
__u8 write_zeroes_may_unmap;
__u8 unused1[3];
/* the next 3 entries are guarded by VIRTIO_BLK_F_SECURE_ERASE */
/*
* The maximum secure erase sectors (in 512-byte sectors) for
* one segment.
*/
__virtio32 max_secure_erase_sectors;
/*
* The maximum number of secure erase segments in a
* secure erase command.
*/
__virtio32 max_secure_erase_seg;
/* Secure erase commands must be aligned to this number of sectors. */
__virtio32 secure_erase_sector_alignment;
/* Zoned block device characteristics (if VIRTIO_BLK_F_ZONED) */
struct virtio_blk_zoned_characteristics {
__virtio32 zone_sectors;
__virtio32 max_open_zones;
__virtio32 max_active_zones;
__virtio32 max_append_sectors;
__virtio32 write_granularity;
__u8 model;
__u8 unused2[3];
} zoned;
} __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
#ifndef VIRTIO_BLK_NO_LEGACY
/* This bit says it's a scsi command, not an actual read or write. */
#define VIRTIO_BLK_T_SCSI_CMD 2
#endif /* VIRTIO_BLK_NO_LEGACY */
/* Cache flush command */
#define VIRTIO_BLK_T_FLUSH 4
/* Get device ID command */
#define VIRTIO_BLK_T_GET_ID 8
/* Discard command */
#define VIRTIO_BLK_T_DISCARD 11
/* Write zeroes command */
#define VIRTIO_BLK_T_WRITE_ZEROES 13
/* Secure erase command */
#define VIRTIO_BLK_T_SECURE_ERASE 14
/* Zone append command */
#define VIRTIO_BLK_T_ZONE_APPEND 15
/* Report zones command */
#define VIRTIO_BLK_T_ZONE_REPORT 16
/* Open zone command */
#define VIRTIO_BLK_T_ZONE_OPEN 18
/* Close zone command */
#define VIRTIO_BLK_T_ZONE_CLOSE 20
/* Finish zone command */
#define VIRTIO_BLK_T_ZONE_FINISH 22
/* Reset zone command */
#define VIRTIO_BLK_T_ZONE_RESET 24
/* Reset All zones command */
#define VIRTIO_BLK_T_ZONE_RESET_ALL 26
#ifndef VIRTIO_BLK_NO_LEGACY
/* Barrier before this op. */
#define VIRTIO_BLK_T_BARRIER 0x80000000
#endif /* !VIRTIO_BLK_NO_LEGACY */
/*
* This comes first in the read scatter-gather list.
* For legacy virtio, if VIRTIO_F_ANY_LAYOUT is not negotiated,
* 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;
};
/*
* Supported zoned device models.
*/
/* Regular block device */
#define VIRTIO_BLK_Z_NONE 0
/* Host-managed zoned device */
#define VIRTIO_BLK_Z_HM 1
/* Host-aware zoned device */
#define VIRTIO_BLK_Z_HA 2
/*
* Zone descriptor. A part of VIRTIO_BLK_T_ZONE_REPORT command reply.
*/
struct virtio_blk_zone_descriptor {
/* Zone capacity */
__virtio64 z_cap;
/* The starting sector of the zone */
__virtio64 z_start;
/* Zone write pointer position in sectors */
__virtio64 z_wp;
/* Zone type */
__u8 z_type;
/* Zone state */
__u8 z_state;
__u8 reserved[38];
};
struct virtio_blk_zone_report {
__virtio64 nr_zones;
__u8 reserved[56];
struct virtio_blk_zone_descriptor zones[];
};
/*
* Supported zone types.
*/
/* Conventional zone */
#define VIRTIO_BLK_ZT_CONV 1
/* Sequential Write Required zone */
#define VIRTIO_BLK_ZT_SWR 2
/* Sequential Write Preferred zone */
#define VIRTIO_BLK_ZT_SWP 3
/*
* Zone states that are available for zones of all types.
*/
/* Not a write pointer (conventional zones only) */
#define VIRTIO_BLK_ZS_NOT_WP 0
/* Empty */
#define VIRTIO_BLK_ZS_EMPTY 1
/* Implicitly Open */
#define VIRTIO_BLK_ZS_IOPEN 2
/* Explicitly Open */
#define VIRTIO_BLK_ZS_EOPEN 3
/* Closed */
#define VIRTIO_BLK_ZS_CLOSED 4
/* Read-Only */
#define VIRTIO_BLK_ZS_RDONLY 13
/* Full */
#define VIRTIO_BLK_ZS_FULL 14
/* Offline */
#define VIRTIO_BLK_ZS_OFFLINE 15
/* Unmap this range (only valid for write zeroes command) */
#define VIRTIO_BLK_WRITE_ZEROES_FLAG_UNMAP 0x00000001
/* Discard/write zeroes range for each request. */
struct virtio_blk_discard_write_zeroes {
/* discard/write zeroes start sector */
__le64 sector;
/* number of discard/write zeroes sectors */
__le32 num_sectors;
/* flags for this range */
__le32 flags;
};
#ifndef VIRTIO_BLK_NO_LEGACY
struct virtio_scsi_inhdr {
__virtio32 errors;
__virtio32 data_len;
__virtio32 sense_len;
__virtio32 residual;
};
#endif /* !VIRTIO_BLK_NO_LEGACY */
/* 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
/* Error codes that are specific to zoned block devices */
#define VIRTIO_BLK_S_ZONE_INVALID_CMD 3
#define VIRTIO_BLK_S_ZONE_UNALIGNED_WP 4
#define VIRTIO_BLK_S_ZONE_OPEN_RESOURCE 5
#define VIRTIO_BLK_S_ZONE_ACTIVE_RESOURCE 6
#endif /* _LINUX_VIRTIO_BLK_H */