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 "standard-headers/linux/virtio_blk.h" 18 #include "hw/virtio/virtio.h" 19 #include "hw/block/block.h" 20 #include "sysemu/iothread.h" 21 #include "sysemu/block-backend.h" 22 23 #define TYPE_VIRTIO_BLK "virtio-blk-device" 24 #define VIRTIO_BLK(obj) \ 25 OBJECT_CHECK(VirtIOBlock, (obj), TYPE_VIRTIO_BLK) 26 27 /* This is the last element of the write scatter-gather list */ 28 struct virtio_blk_inhdr 29 { 30 unsigned char status; 31 }; 32 33 struct VirtIOBlkConf 34 { 35 BlockConf conf; 36 IOThread *iothread; 37 char *serial; 38 uint32_t request_merging; 39 uint16_t num_queues; 40 uint16_t queue_size; 41 }; 42 43 struct VirtIOBlockDataPlane; 44 45 struct VirtIOBlockReq; 46 typedef struct VirtIOBlock { 47 VirtIODevice parent_obj; 48 BlockBackend *blk; 49 void *rq; 50 QEMUBH *bh; 51 VirtIOBlkConf conf; 52 unsigned short sector_mask; 53 bool original_wce; 54 VMChangeStateEntry *change; 55 bool dataplane_disabled; 56 bool dataplane_started; 57 struct VirtIOBlockDataPlane *dataplane; 58 uint64_t host_features; 59 } VirtIOBlock; 60 61 typedef struct VirtIOBlockReq { 62 VirtQueueElement elem; 63 int64_t sector_num; 64 VirtIOBlock *dev; 65 VirtQueue *vq; 66 struct virtio_blk_inhdr *in; 67 struct virtio_blk_outhdr out; 68 QEMUIOVector qiov; 69 size_t in_len; 70 struct VirtIOBlockReq *next; 71 struct VirtIOBlockReq *mr_next; 72 BlockAcctCookie acct; 73 } VirtIOBlockReq; 74 75 #define VIRTIO_BLK_MAX_MERGE_REQS 32 76 77 typedef struct MultiReqBuffer { 78 VirtIOBlockReq *reqs[VIRTIO_BLK_MAX_MERGE_REQS]; 79 unsigned int num_reqs; 80 bool is_write; 81 } MultiReqBuffer; 82 83 bool virtio_blk_handle_vq(VirtIOBlock *s, VirtQueue *vq); 84 85 #endif 86