| /* |
| * 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" |
| #include "sysemu/iothread.h" |
| |
| #define TYPE_VIRTIO_BLK "virtio-blk-device" |
| #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; |
| IOThread *iothread; |
| 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; |
| bool original_wce; |
| VMChangeStateEntry *change; |
| #ifdef CONFIG_VIRTIO_BLK_DATA_PLANE |
| Notifier migration_state_notifier; |
| 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), \ |
| DEFINE_PROP_IOTHREAD("x-iothread", _state, _field.iothread) |
| #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), \ |
| DEFINE_PROP_IOTHREAD("x-iothread", _state, _field.iothread) |
| #endif /* __linux__ */ |
| |
| void virtio_blk_set_conf(DeviceState *dev, VirtIOBlkConf *blk); |
| |
| int virtio_blk_handle_scsi_req(VirtIOBlock *blk, |
| VirtQueueElement *elem); |
| |
| #endif |