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 */ 28struct virtio_blk_inhdr 29{ 30 unsigned char status; 31}; 32 33struct VirtIOBlkConf 34{ 35 BlockConf conf; 36 IOThread *iothread; 37 char *serial; 38 uint32_t scsi; 39 uint32_t config_wce; 40 uint32_t request_merging; 41}; 42 43struct VirtIOBlockDataPlane; 44 45struct VirtIOBlockReq; 46typedef struct VirtIOBlock { 47 VirtIODevice parent_obj; 48 BlockBackend *blk; 49 VirtQueue *vq; 50 void *rq; 51 QEMUBH *bh; 52 VirtIOBlkConf conf; 53 unsigned short sector_mask; 54 bool original_wce; 55 VMChangeStateEntry *change; 56 bool dataplane_disabled; 57 bool dataplane_started; 58 struct VirtIOBlockDataPlane *dataplane; 59} VirtIOBlock; 60 61typedef struct VirtIOBlockReq { 62 VirtQueueElement elem; 63 int64_t sector_num; 64 VirtIOBlock *dev; 65 struct virtio_blk_inhdr *in; 66 struct virtio_blk_outhdr out; 67 QEMUIOVector qiov; 68 size_t in_len; 69 struct VirtIOBlockReq *next; 70 struct VirtIOBlockReq *mr_next; 71 BlockAcctCookie acct; 72} VirtIOBlockReq; 73 74#define VIRTIO_BLK_MAX_MERGE_REQS 32 75 76typedef struct MultiReqBuffer { 77 VirtIOBlockReq *reqs[VIRTIO_BLK_MAX_MERGE_REQS]; 78 unsigned int num_reqs; 79 bool is_write; 80} MultiReqBuffer; 81 82void virtio_blk_init_request(VirtIOBlock *s, VirtIOBlockReq *req); 83void virtio_blk_free_request(VirtIOBlockReq *req); 84 85void virtio_blk_handle_request(VirtIOBlockReq *req, MultiReqBuffer *mrb); 86 87void virtio_blk_submit_multireq(BlockBackend *blk, MultiReqBuffer *mrb); 88 89void virtio_blk_handle_vq(VirtIOBlock *s, VirtQueue *vq); 90 91#endif 92