| 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 "system/iothread.h" |
| 21 | #include "system/block-backend.h" |
| 22 | #include "system/block-ram-registrar.h" |
| 23 | #include "qom/object.h" |
| 24 | #include "qapi/qapi-types-virtio.h" |
| 25 | |
| 26 | #define TYPE_VIRTIO_BLK "virtio-blk-device" |
| 27 | OBJECT_DECLARE_TYPE(VirtIOBlock, VirtIOBlkClass, VIRTIO_BLK) |
| 28 | |
| 29 | /* This is the last element of the write scatter-gather list */ |
| 30 | struct virtio_blk_inhdr |
| 31 | { |
| 32 | unsigned char status; |
| 33 | }; |
| 34 | |
| 35 | #define VIRTIO_BLK_AUTO_NUM_QUEUES UINT16_MAX |
| 36 | |
| 37 | struct VirtIOBlkConf |
| 38 | { |
| 39 | BlockConf conf; |
| 40 | IOThread *iothread; |
| 41 | IOThreadVirtQueueMappingList *iothread_vq_mapping_list; |
| 42 | char *serial; |
| 43 | uint32_t request_merging; |
| 44 | uint16_t num_queues; |
| 45 | uint16_t queue_size; |
| 46 | bool seg_max_adjust; |
| 47 | bool report_discard_granularity; |
| 48 | uint32_t max_discard_sectors; |
| 49 | uint32_t max_write_zeroes_sectors; |
| 50 | bool x_enable_wce_if_config_wce; |
| 51 | }; |
| 52 | |
| 53 | struct VirtIOBlockReq; |
| 54 | struct VirtIOBlock { |
| 55 | VirtIODevice parent_obj; |
| 56 | BlockBackend *blk; |
| 57 | QemuMutex rq_lock; |
| 58 | struct VirtIOBlockReq *rq; /* protected by rq_lock */ |
| 59 | VirtIOBlkConf conf; |
| 60 | unsigned short sector_mask; |
| 61 | bool original_wce; |
| 62 | VMChangeStateEntry *change; |
| 63 | bool ioeventfd_disabled; |
| 64 | bool ioeventfd_started; |
| 65 | bool ioeventfd_starting; |
| 66 | bool ioeventfd_stopping; |
| 67 | |
| 68 | /* |
| 69 | * The AioContext for each virtqueue. The BlockDriverState will use the |
| 70 | * first element as its AioContext. |
| 71 | */ |
| 72 | AioContext **vq_aio_context; |
| 73 | |
| 74 | uint64_t host_features; |
| 75 | size_t config_size; |
| 76 | BlockRAMRegistrar blk_ram_registrar; |
| 77 | }; |
| 78 | |
| 79 | typedef struct VirtIOBlockReq { |
| 80 | VirtQueueElement elem; |
| 81 | int64_t sector_num; |
| 82 | VirtIOBlock *dev; |
| 83 | VirtQueue *vq; |
| 84 | IOVDiscardUndo inhdr_undo; |
| 85 | IOVDiscardUndo outhdr_undo; |
| 86 | struct virtio_blk_inhdr *in; |
| 87 | struct virtio_blk_outhdr out; |
| 88 | QEMUIOVector qiov; |
| 89 | size_t in_len; |
| 90 | struct VirtIOBlockReq *next; |
| 91 | struct VirtIOBlockReq *mr_next; |
| 92 | BlockAcctCookie acct; |
| 93 | } VirtIOBlockReq; |
| 94 | |
| 95 | #define VIRTIO_BLK_MAX_MERGE_REQS 32 |
| 96 | |
| 97 | typedef struct MultiReqBuffer { |
| 98 | VirtIOBlockReq *reqs[VIRTIO_BLK_MAX_MERGE_REQS]; |
| 99 | unsigned int num_reqs; |
| 100 | bool is_write; |
| 101 | } MultiReqBuffer; |
| 102 | |
| 103 | typedef struct VirtIOBlkClass { |
| 104 | /*< private >*/ |
| 105 | VirtioDeviceClass parent; |
| 106 | /*< public >*/ |
| 107 | bool (*handle_unknown_request)(VirtIOBlockReq *req, MultiReqBuffer *mrb, |
| 108 | uint32_t type); |
| 109 | } VirtIOBlkClass; |
| 110 | |
| 111 | void virtio_blk_handle_vq(VirtIOBlock *s, VirtQueue *vq); |
| 112 | void virtio_blk_req_complete(VirtIOBlockReq *req, unsigned char status); |
| 113 | |
| 114 | #endif |