[mirror_qemu.git] / hw / virtio-blk.h

/*
 * Virtio Block Device
 *
 * Copyright IBM, Corp. 2007
 *
 * Authors:
 *  Anthony Liguori   <aliguori@us.ibm.com>
 *
 * This work is licensed under the terms of the GNU GPL, version 2.  See
 * the COPYING file in the top-level directory.
 *
 */

#ifndef _QEMU_VIRTIO_BLK_H
#define _QEMU_VIRTIO_BLK_H

#include "virtio.h"
#include "block.h"

/* from Linux's linux/virtio_blk.h */

/* The ID for virtio_block */
#define VIRTIO_ID_BLOCK 2

/* 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       /* Indicates support of legacy geometry */
#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_IDENTIFY   8       /* ATA IDENTIFY supported */
#define VIRTIO_BLK_F_WCACHE     9       /* write cache enabled */

#define VIRTIO_BLK_ID_LEN       256     /* length of identify u16 array */
#define VIRTIO_BLK_ID_SN        10      /* start of char * serial# */
#define VIRTIO_BLK_ID_SN_BYTES  20      /* length in bytes of serial# */

struct virtio_blk_config
{
    uint64_t capacity;
    uint32_t size_max;
    uint32_t seg_max;
    uint16_t cylinders;
    uint8_t heads;
    uint8_t sectors;
    uint32_t _blk_size;    /* structure pad, currently unused */
    uint16_t identify[VIRTIO_BLK_ID_LEN];
} __attribute__((packed));

/* 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

/* Flush the volatile write cache */
#define VIRTIO_BLK_T_FLUSH      4

/* 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* */
    uint32_t type;
    /* io priority. */
    uint32_t ioprio;
    /* Sector (ie. 512 byte offset) */
    uint64_t sector;
};

#define VIRTIO_BLK_S_OK         0
#define VIRTIO_BLK_S_IOERR      1
#define VIRTIO_BLK_S_UNSUPP     2

/* This is the last element of the write scatter-gather list */
struct virtio_blk_inhdr
{
    unsigned char status;
};

/* SCSI pass-through header */
struct virtio_scsi_inhdr
{
    uint32_t errors;
    uint32_t data_len;
    uint32_t sense_len;
    uint32_t residual;
};

#endif
Commit	Line	Data
	1	/*
	2	* Virtio Block Device
	3	*
	4	* Copyright IBM, Corp. 2007
	5	*
	6	* Authors:
	7	* Anthony Liguori <aliguori@us.ibm.com>
	8	*
	9	* This work is licensed under the terms of the GNU GPL, version 2. See
	10	* the COPYING file in the top-level directory.
	11	*
	12	*/
	13
	14	#ifndef _QEMU_VIRTIO_BLK_H
	15	#define _QEMU_VIRTIO_BLK_H
	16
	17	#include "virtio.h"
	18	#include "block.h"
	19
	20	/* from Linux's linux/virtio_blk.h */
	21
	22	/* The ID for virtio_block */
	23	#define VIRTIO_ID_BLOCK 2
	24
	25	/* Feature bits */
	26	#define VIRTIO_BLK_F_BARRIER 0 /* Does host support barriers? */
	27	#define VIRTIO_BLK_F_SIZE_MAX 1 /* Indicates maximum segment size */
	28	#define VIRTIO_BLK_F_SEG_MAX 2 /* Indicates maximum # of segments */
	29	#define VIRTIO_BLK_F_GEOMETRY 4 /* Indicates support of legacy geometry */
	30	#define VIRTIO_BLK_F_RO 5 /* Disk is read-only */
	31	#define VIRTIO_BLK_F_BLK_SIZE 6 /* Block size of disk is available*/
	32	#define VIRTIO_BLK_F_SCSI 7 /* Supports scsi command passthru */
	33	#define VIRTIO_BLK_F_IDENTIFY 8 /* ATA IDENTIFY supported */
	34	#define VIRTIO_BLK_F_WCACHE 9 /* write cache enabled */
	35
	36	#define VIRTIO_BLK_ID_LEN 256 /* length of identify u16 array */
	37	#define VIRTIO_BLK_ID_SN 10 /* start of char * serial# */
	38	#define VIRTIO_BLK_ID_SN_BYTES 20 /* length in bytes of serial# */
	39
	40	struct virtio_blk_config
	41	{
	42	uint64_t capacity;
	43	uint32_t size_max;
	44	uint32_t seg_max;
	45	uint16_t cylinders;
	46	uint8_t heads;
	47	uint8_t sectors;
	48	uint32_t _blk_size; /* structure pad, currently unused */
	49	uint16_t identify[VIRTIO_BLK_ID_LEN];
	50	} __attribute__((packed));
	51
	52	/* These two define direction. */
	53	#define VIRTIO_BLK_T_IN 0
	54	#define VIRTIO_BLK_T_OUT 1
	55
	56	/* This bit says it's a scsi command, not an actual read or write. */
	57	#define VIRTIO_BLK_T_SCSI_CMD 2
	58
	59	/* Flush the volatile write cache */
	60	#define VIRTIO_BLK_T_FLUSH 4
	61
	62	/* Barrier before this op. */
	63	#define VIRTIO_BLK_T_BARRIER 0x80000000
	64
	65	/* This is the first element of the read scatter-gather list. */
	66	struct virtio_blk_outhdr
	67	{
	68	/* VIRTIO_BLK_T* */
	69	uint32_t type;
	70	/* io priority. */
	71	uint32_t ioprio;
	72	/* Sector (ie. 512 byte offset) */
	73	uint64_t sector;
	74	};
	75
	76	#define VIRTIO_BLK_S_OK 0
	77	#define VIRTIO_BLK_S_IOERR 1
	78	#define VIRTIO_BLK_S_UNSUPP 2
	79
	80	/* This is the last element of the write scatter-gather list */
	81	struct virtio_blk_inhdr
	82	{
	83	unsigned char status;
	84	};
	85
	86	/* SCSI pass-through header */
	87	struct virtio_scsi_inhdr
	88	{
	89	uint32_t errors;
	90	uint32_t data_len;
	91	uint32_t sense_len;
	92	uint32_t residual;
	93	};
	94
	95	#endif