Add qemu 2.4.0

[kvmfornfv.git] / qemu / include / hw / virtio / virtio-blk.h

diff --git a/qemu/include/hw/virtio/virtio-blk.h b/qemu/include/hw/virtio/virtio-blk.h
new file mode 100644 (file)
index 0000000..6bf5905
--- /dev/null
+++ b/qemu/include/hw/virtio/virtio-blk.h
@@ -0,0 +1,92 @@
+/*
+ * Virtio Block Device
+ *
+ * Copyright IBM, Corp. 2007
+ *
+ * Authors:
+ *  Anthony Liguori   <aliguori@us.ibm.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2.  See
+ * the COPYING file in the top-level directory.
+ *
+ */
+
+#ifndef _QEMU_VIRTIO_BLK_H
+#define _QEMU_VIRTIO_BLK_H
+
+#include "standard-headers/linux/virtio_blk.h"
+#include "hw/virtio/virtio.h"
+#include "hw/block/block.h"
+#include "sysemu/iothread.h"
+#include "sysemu/block-backend.h"
+
+#define TYPE_VIRTIO_BLK "virtio-blk-device"
+#define VIRTIO_BLK(obj) \
+        OBJECT_CHECK(VirtIOBlock, (obj), TYPE_VIRTIO_BLK)
+
+/* This is the last element of the write scatter-gather list */
+struct virtio_blk_inhdr
+{
+    unsigned char status;
+};
+
+struct VirtIOBlkConf
+{
+    BlockConf conf;
+    IOThread *iothread;
+    char *serial;
+    uint32_t scsi;
+    uint32_t config_wce;
+    uint32_t data_plane;
+    uint32_t request_merging;
+};
+
+struct VirtIOBlockDataPlane;
+
+struct VirtIOBlockReq;
+typedef struct VirtIOBlock {
+    VirtIODevice parent_obj;
+    BlockBackend *blk;
+    VirtQueue *vq;
+    void *rq;
+    QEMUBH *bh;
+    VirtIOBlkConf conf;
+    unsigned short sector_mask;
+    bool original_wce;
+    VMChangeStateEntry *change;
+    /* Function to push to vq and notify guest */
+    void (*complete_request)(struct VirtIOBlockReq *req, unsigned char status);
+    Notifier migration_state_notifier;
+    struct VirtIOBlockDataPlane *dataplane;
+} VirtIOBlock;
+
+typedef struct VirtIOBlockReq {
+    int64_t sector_num;
+    VirtIOBlock *dev;
+    VirtQueueElement elem;
+    struct virtio_blk_inhdr *in;
+    struct virtio_blk_outhdr out;
+    QEMUIOVector qiov;
+    size_t in_len;
+    struct VirtIOBlockReq *next;
+    struct VirtIOBlockReq *mr_next;
+    BlockAcctCookie acct;
+} VirtIOBlockReq;
+
+#define VIRTIO_BLK_MAX_MERGE_REQS 32
+
+typedef struct MultiReqBuffer {
+    VirtIOBlockReq *reqs[VIRTIO_BLK_MAX_MERGE_REQS];
+    unsigned int num_reqs;
+    bool is_write;
+} MultiReqBuffer;
+
+VirtIOBlockReq *virtio_blk_alloc_request(VirtIOBlock *s);
+
+void virtio_blk_free_request(VirtIOBlockReq *req);
+
+void virtio_blk_handle_request(VirtIOBlockReq *req, MultiReqBuffer *mrb);
+
+void virtio_blk_submit_multireq(BlockBackend *blk, MultiReqBuffer *mrb);
+
+#endif