LXR qemu/include/hw/virtio/virtio-blk.h

   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    uint16_t num_queues;
  42};
  43
  44struct VirtIOBlockDataPlane;
  45
  46struct VirtIOBlockReq;
  47typedef struct VirtIOBlock {
  48    VirtIODevice parent_obj;
  49    BlockBackend *blk;
  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    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
  77typedef struct MultiReqBuffer {
  78    VirtIOBlockReq *reqs[VIRTIO_BLK_MAX_MERGE_REQS];
  79    unsigned int num_reqs;
  80    bool is_write;
  81} MultiReqBuffer;
  82
  83void virtio_blk_init_request(VirtIOBlock *s, VirtQueue *vq,
  84                             VirtIOBlockReq *req);
  85void virtio_blk_free_request(VirtIOBlockReq *req);
  86
  87void virtio_blk_handle_request(VirtIOBlockReq *req, MultiReqBuffer *mrb);
  88
  89void virtio_blk_submit_multireq(BlockBackend *blk, MultiReqBuffer *mrb);
  90
  91void virtio_blk_handle_vq(VirtIOBlock *s, VirtQueue *vq);
  92
  93#endif
  94