From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:51459) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1cgpYI-0005df-No for qemu-devel@nongnu.org; Thu, 23 Feb 2017 04:19:07 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1cgpYH-0003CY-T8 for qemu-devel@nongnu.org; Thu, 23 Feb 2017 04:19:06 -0500 From: Fam Zheng Date: Thu, 23 Feb 2017 17:18:43 +0800 Message-Id: <20170223091845.18523-5-famz@redhat.com> In-Reply-To: <20170223091845.18523-1-famz@redhat.com> References: <20170223091845.18523-1-famz@redhat.com> Subject: [Qemu-devel] [PATCH v2 4/6] block: Introduce bdrv_dma_map and bdrv_dma_unmap List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: Paolo Bonzini , Karl Rister , Stefan Hajnoczi , Max Reitz , qemu-block@nongnu.org Allow block driver to map and unmap a buffer for later I/O, as a performance hint. Signed-off-by: Fam Zheng --- 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