| /* |
| * 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 "standard-headers/linux/virtio_blk.h" |
| #include "hw/virtio/virtio.h" |
| #include "hw/block/block.h" |
| #include "sysemu/iothread.h" |
| #include "sysemu/block-backend.h" |
| #include "qom/object.h" |
| |
| #define TYPE_VIRTIO_BLK "virtio-blk-device" |
| OBJECT_DECLARE_SIMPLE_TYPE(VirtIOBlock, VIRTIO_BLK) |
| |
| /* This is the last element of the write scatter-gather list */ |
| struct virtio_blk_inhdr |
| { |
| unsigned char status; |
| }; |
| |
| #define VIRTIO_BLK_AUTO_NUM_QUEUES UINT16_MAX |
| |
| struct VirtIOBlkConf |
| { |
| BlockConf conf; |
| IOThread *iothread; |
| char *serial; |
| uint32_t request_merging; |
| uint16_t num_queues; |
| uint16_t queue_size; |
| bool seg_max_adjust; |
| bool report_discard_granularity; |
| uint32_t max_discard_sectors; |
| uint32_t max_write_zeroes_sectors; |
| bool x_enable_wce_if_config_wce; |
| }; |
| |
| struct VirtIOBlockDataPlane; |
| |
| struct VirtIOBlockReq; |
| struct VirtIOBlock { |
| VirtIODevice parent_obj; |
| BlockBackend *blk; |
| void *rq; |
| QEMUBH *bh; |
| VirtIOBlkConf conf; |
| unsigned short sector_mask; |
| bool original_wce; |
| VMChangeStateEntry *change; |
| bool dataplane_disabled; |
| bool dataplane_started; |
| struct VirtIOBlockDataPlane *dataplane; |
| uint64_t host_features; |
| size_t config_size; |
| }; |
| |
| typedef struct VirtIOBlockReq { |
| VirtQueueElement elem; |
| int64_t sector_num; |
| VirtIOBlock *dev; |
| VirtQueue *vq; |
| IOVDiscardUndo inhdr_undo; |
| IOVDiscardUndo outhdr_undo; |
| struct virtio_blk_inhdr *in; |
| struct virtio_blk_outhdr out; |
| QEMUIOVector qiov; |
| size_t in_len; |
| struct VirtIOBlockReq *next; |
| struct VirtIOBlockReq *mr_next; |
| BlockAcctCookie acct; |
| } VirtIOBlockReq; |
| |
| #define VIRTIO_BLK_MAX_MERGE_REQS 32 |
| |
| typedef struct MultiReqBuffer { |
| VirtIOBlockReq *reqs[VIRTIO_BLK_MAX_MERGE_REQS]; |
| unsigned int num_reqs; |
| bool is_write; |
| } MultiReqBuffer; |
| |
| bool virtio_blk_handle_vq(VirtIOBlock *s, VirtQueue *vq); |
| void virtio_blk_process_queued_requests(VirtIOBlock *s, bool is_bh); |
| |
| #endif |