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[Qemu-block] [PATCH v2 4/6] block: Introduce bdrv_dma_map and bdrv_dma_u
From: |
Fam Zheng |
Subject: |
[Qemu-block] [PATCH v2 4/6] block: Introduce bdrv_dma_map and bdrv_dma_unmap |
Date: |
Thu, 23 Feb 2017 17:18:43 +0800 |
Allow block driver to map and unmap a buffer for later I/O, as a performance
hint.
Signed-off-by: Fam Zheng <address@hidden>
---
block/block-backend.c | 10 ++++++++++
block/io.c | 24 ++++++++++++++++++++++++
include/block/block.h | 2 ++
include/block/block_int.h | 4 ++++
include/sysemu/block-backend.h | 3 +++
5 files changed, 43 insertions(+)
diff --git a/block/block-backend.c b/block/block-backend.c
index 819f272..ff05662 100644
--- a/block/block-backend.c
+++ b/block/block-backend.c
@@ -1786,3 +1786,13 @@ static void blk_root_drained_end(BdrvChild *child)
assert(blk->public.io_limits_disabled);
--blk->public.io_limits_disabled;
}
+
+void blk_dma_map(BlockBackend *blk, void *host, size_t size)
+{
+ bdrv_dma_map(blk_bs(blk), host, size);
+}
+
+void blk_dma_unmap(BlockBackend *blk, void *host)
+{
+ bdrv_dma_unmap(blk_bs(blk), host);
+}
diff --git a/block/io.c b/block/io.c
index d5c4544..541a5fb 100644
--- a/block/io.c
+++ b/block/io.c
@@ -2646,3 +2646,27 @@ void bdrv_io_unplug(BlockDriverState *bs)
bdrv_io_unplug(child->bs);
}
}
+
+void bdrv_dma_map(BlockDriverState *bs, void *host, size_t size)
+{
+ BdrvChild *child;
+
+ if (bs->drv && bs->drv->bdrv_dma_map) {
+ bs->drv->bdrv_dma_map(bs, host, size);
+ }
+ QLIST_FOREACH(child, &bs->children, next) {
+ bdrv_dma_map(child->bs, host, size);
+ }
+}
+
+void bdrv_dma_unmap(BlockDriverState *bs, void *host)
+{
+ BdrvChild *child;
+
+ if (bs->drv && bs->drv->bdrv_dma_unmap) {
+ bs->drv->bdrv_dma_unmap(bs, host);
+ }
+ QLIST_FOREACH(child, &bs->children, next) {
+ bdrv_dma_unmap(child->bs, host);
+ }
+}
diff --git a/include/block/block.h b/include/block/block.h
index 4e81f20..1c72159 100644
--- a/include/block/block.h
+++ b/include/block/block.h
@@ -551,4 +551,6 @@ void bdrv_add_child(BlockDriverState *parent,
BlockDriverState *child,
Error **errp);
void bdrv_del_child(BlockDriverState *parent, BdrvChild *child, Error **errp);
+void bdrv_dma_map(BlockDriverState *bs, void *host, size_t size);
+void bdrv_dma_unmap(BlockDriverState *bs, void *host);
#endif
diff --git a/include/block/block_int.h b/include/block/block_int.h
index 1670941..b061fd1 100644
--- a/include/block/block_int.h
+++ b/include/block/block_int.h
@@ -320,6 +320,10 @@ struct BlockDriver {
void (*bdrv_del_child)(BlockDriverState *parent, BdrvChild *child,
Error **errp);
+ /* Map and unmap a buffer for later I/O, as a performance hint to the
+ * driver. */
+ void (*bdrv_dma_map)(BlockDriverState *bs, void *host, size_t size);
+ void (*bdrv_dma_unmap)(BlockDriverState *bs, void *host);
QLIST_ENTRY(BlockDriver) list;
};
diff --git a/include/sysemu/block-backend.h b/include/sysemu/block-backend.h
index f365a51..6832b48 100644
--- a/include/sysemu/block-backend.h
+++ b/include/sysemu/block-backend.h
@@ -230,4 +230,7 @@ void blk_io_limits_disable(BlockBackend *blk);
void blk_io_limits_enable(BlockBackend *blk, const char *group);
void blk_io_limits_update_group(BlockBackend *blk, const char *group);
+void blk_dma_map(BlockBackend *blk, void *host, size_t size);
+void blk_dma_unmap(BlockBackend *blk, void *host);
+
#endif
--
2.9.3
- [Qemu-block] [PATCH v2 0/6] block: Add VFIO based driver for NVMe device, Fam Zheng, 2017/02/23
- [Qemu-block] [PATCH v2 2/6] stubs: Add stubs for ram block notifier API, Fam Zheng, 2017/02/23
- [Qemu-block] [PATCH v2 1/6] nvme: Move NVMe definitions to a separate header, Fam Zheng, 2017/02/23
- [Qemu-block] [PATCH v2 4/6] block: Introduce bdrv_dma_map and bdrv_dma_unmap,
Fam Zheng <=
- [Qemu-block] [PATCH v2 5/6] block/nvme: Implement .bdrv_dma_map and .bdrv_dma_unmap, Fam Zheng, 2017/02/23
- [Qemu-block] [PATCH v2 3/6] block: Add VFIO based NVMe driver, Fam Zheng, 2017/02/23
- [Qemu-block] [PATCH v2 6/6] qemu-img: dma map buffers, Fam Zheng, 2017/02/23
- Re: [Qemu-block] [Qemu-devel] [PATCH v2 0/6] block: Add VFIO based driver for NVMe device, no-reply, 2017/02/23
- Re: [Qemu-block] [Qemu-devel] [PATCH v2 0/6] block: Add VFIO based driver for NVMe device, Fam Zheng, 2017/02/23