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 #include "sysemu/block-ram-registrar.h" 23 #include "qom/object.h" 24 25 #define TYPE_VIRTIO_BLK "virtio-blk-device" 26 OBJECT_DECLARE_SIMPLE_TYPE(VirtIOBlock, VIRTIO_BLK) 27 28 /* This is the last element of the write scatter-gather list */ 29 struct virtio_blk_inhdr 30 { 31 unsigned char status; 32 }; 33 34 #define VIRTIO_BLK_AUTO_NUM_QUEUES UINT16_MAX 35 36 struct VirtIOBlkConf 37 { 38 BlockConf conf; 39 IOThread *iothread; 40 char *serial; 41 uint32_t request_merging; 42 uint16_t num_queues; 43 uint16_t queue_size; 44 bool seg_max_adjust; 45 bool report_discard_granularity; 46 uint32_t max_discard_sectors; 47 uint32_t max_write_zeroes_sectors; 48 bool x_enable_wce_if_config_wce; 49 }; 50 51 struct VirtIOBlockDataPlane; 52 53 struct VirtIOBlockReq; 54 struct VirtIOBlock { 55 VirtIODevice parent_obj; 56 BlockBackend *blk; 57 void *rq; 58 VirtIOBlkConf conf; 59 unsigned short sector_mask; 60 bool original_wce; 61 VMChangeStateEntry *change; 62 bool dataplane_disabled; 63 bool dataplane_started; 64 struct VirtIOBlockDataPlane *dataplane; 65 uint64_t host_features; 66 size_t config_size; 67 BlockRAMRegistrar blk_ram_registrar; 68 }; 69 70 typedef struct VirtIOBlockReq { 71 VirtQueueElement elem; 72 int64_t sector_num; 73 VirtIOBlock *dev; 74 VirtQueue *vq; 75 IOVDiscardUndo inhdr_undo; 76 IOVDiscardUndo outhdr_undo; 77 struct virtio_blk_inhdr *in; 78 struct virtio_blk_outhdr out; 79 QEMUIOVector qiov; 80 size_t in_len; 81 struct VirtIOBlockReq *next; 82 struct VirtIOBlockReq *mr_next; 83 BlockAcctCookie acct; 84 } VirtIOBlockReq; 85 86 #define VIRTIO_BLK_MAX_MERGE_REQS 32 87 88 typedef struct MultiReqBuffer { 89 VirtIOBlockReq *reqs[VIRTIO_BLK_MAX_MERGE_REQS]; 90 unsigned int num_reqs; 91 bool is_write; 92 } MultiReqBuffer; 93 94 void virtio_blk_handle_vq(VirtIOBlock *s, VirtQueue *vq); 95 96 #endif 97