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-rw-r--r--qemu/include/hw/virtio/virtio-blk.h92
1 files changed, 92 insertions, 0 deletions
diff --git a/qemu/include/hw/virtio/virtio-blk.h b/qemu/include/hw/virtio/virtio-blk.h
new file mode 100644
index 000000000..6bf5905c5
--- /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