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Diffstat (limited to 'include/hw/virtio/virtio-blk.h')
| -rw-r--r-- | include/hw/virtio/virtio-blk.h | 152 |
1 files changed, 152 insertions, 0 deletions
diff --git a/include/hw/virtio/virtio-blk.h b/include/hw/virtio/virtio-blk.h new file mode 100644 index 0000000000..c10d069b25 --- /dev/null +++ b/include/hw/virtio/virtio-blk.h @@ -0,0 +1,152 @@ +/* + * 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 "hw/virtio/virtio.h" +#include "hw/block/block.h" + +#define TYPE_VIRTIO_BLK "virtio-blk" +#define VIRTIO_BLK(obj) \ + OBJECT_CHECK(VirtIOBlock, (obj), TYPE_VIRTIO_BLK) + +/* 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, DEPRECATED */ +#define VIRTIO_BLK_F_WCE 9 /* write cache enabled */ +#define VIRTIO_BLK_F_TOPOLOGY 10 /* Topology information is available */ +#define VIRTIO_BLK_F_CONFIG_WCE 11 /* write cache configurable */ + +#define VIRTIO_BLK_ID_BYTES 20 /* ID string length */ + +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; + uint8_t physical_block_exp; + uint8_t alignment_offset; + uint16_t min_io_size; + uint32_t opt_io_size; + uint8_t wce; +} QEMU_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 + +/* return the device ID string */ +#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* */ + 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; +}; + +struct VirtIOBlkConf +{ + BlockConf conf; + char *serial; + uint32_t scsi; + uint32_t config_wce; + uint32_t data_plane; +}; + +struct VirtIOBlockDataPlane; + +typedef struct VirtIOBlock { + VirtIODevice parent_obj; + BlockDriverState *bs; + VirtQueue *vq; + void *rq; + QEMUBH *bh; + BlockConf *conf; + VirtIOBlkConf blk; + unsigned short sector_mask; + VMChangeStateEntry *change; +#ifdef CONFIG_VIRTIO_BLK_DATA_PLANE + struct VirtIOBlockDataPlane *dataplane; +#endif +} VirtIOBlock; + +#define DEFINE_VIRTIO_BLK_FEATURES(_state, _field) \ + DEFINE_VIRTIO_COMMON_FEATURES(_state, _field) + +#ifdef __linux__ +#define DEFINE_VIRTIO_BLK_PROPERTIES(_state, _field) \ + DEFINE_BLOCK_PROPERTIES(_state, _field.conf), \ + DEFINE_BLOCK_CHS_PROPERTIES(_state, _field.conf), \ + DEFINE_PROP_STRING("serial", _state, _field.serial), \ + DEFINE_PROP_BIT("config-wce", _state, _field.config_wce, 0, true), \ + DEFINE_PROP_BIT("scsi", _state, _field.scsi, 0, true) +#else +#define DEFINE_VIRTIO_BLK_PROPERTIES(_state, _field) \ + DEFINE_BLOCK_PROPERTIES(_state, _field.conf), \ + DEFINE_BLOCK_CHS_PROPERTIES(_state, _field.conf), \ + DEFINE_PROP_STRING("serial", _state, _field.serial), \ + DEFINE_PROP_BIT("config-wce", _state, _field.config_wce, 0, true) +#endif /* __linux__ */ + +void virtio_blk_set_conf(DeviceState *dev, VirtIOBlkConf *blk); + +#endif |