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 request_merging;
  39    uint16_t num_queues;
  40    uint16_t queue_size;
  41    uint32_t max_discard_sectors;
  42    uint32_t max_write_zeroes_sectors;
  43};
  44
  45struct VirtIOBlockDataPlane;
  46
  47struct VirtIOBlockReq;
  48typedef struct VirtIOBlock {
  49    VirtIODevice parent_obj;
  50    BlockBackend *blk;
  51    void *rq;
  52    QEMUBH *bh;
  53    VirtIOBlkConf conf;
  54    unsigned short sector_mask;
  55    bool original_wce;
  56    VMChangeStateEntry *change;
  57    bool dataplane_disabled;
  58    bool dataplane_started;
  59    struct VirtIOBlockDataPlane *dataplane;
  60    uint64_t host_features;
  61    size_t config_size;
  62} VirtIOBlock;
  63
  64typedef struct VirtIOBlockReq {
  65    VirtQueueElement elem;
  66    int64_t sector_num;
  67    VirtIOBlock *dev;
  68    VirtQueue *vq;
  69    struct virtio_blk_inhdr *in;
  70    struct virtio_blk_outhdr out;
  71    QEMUIOVector qiov;
  72    size_t in_len;
  73    struct VirtIOBlockReq *next;
  74    struct VirtIOBlockReq *mr_next;
  75    BlockAcctCookie acct;
  76} VirtIOBlockReq;
  77
  78#define VIRTIO_BLK_MAX_MERGE_REQS 32
  79
  80typedef struct MultiReqBuffer {
  81    VirtIOBlockReq *reqs[VIRTIO_BLK_MAX_MERGE_REQS];
  82    unsigned int num_reqs;
  83    bool is_write;
  84} MultiReqBuffer;
  85
  86bool virtio_blk_handle_vq(VirtIOBlock *s, VirtQueue *vq);
  87
  88#endif
  89