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Tsirkin" , Jason Wang , Xuan Zhuo , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Alexei Starovoitov , Daniel Borkmann , Jesper Dangaard Brouer , John Fastabend , netdev@vger.kernel.org, bpf@vger.kernel.org Subject: [PATCH vhost 2/5] virtio_ring: introduce dma map api for page Date: Wed, 8 May 2024 10:23:28 +0800 Message-Id: <20240508022331.63751-3-xuanzhuo@linux.alibaba.com> X-Mailer: git-send-email 2.32.0.3.g01195cf9f In-Reply-To: <20240508022331.63751-1-xuanzhuo@linux.alibaba.com> References: <20240508022331.63751-1-xuanzhuo@linux.alibaba.com> Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Git-Hash: a0fef46c457b The virtio-net sq will use these APIs to map the scatterlist. For scatterlist, the page dma APIs are more appropriate. dma_addr_t virtqueue_dma_map_page_attrs(struct virtqueue *_vq, struct page *page, size_t offset, size_t size, enum dma_data_direction dir, unsigned long attrs); void virtqueue_dma_unmap_page_attrs(struct virtqueue *_vq, dma_addr_t addr, size_t size, enum dma_data_direction dir, unsigned long attrs); Signed-off-by: Xuan Zhuo --- drivers/virtio/virtio_ring.c | 52 ++++++++++++++++++++++++++++++++++++ include/linux/virtio.h | 7 +++++ 2 files changed, 59 insertions(+) diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c index d7059bacb593..653c7ea24fb7 100644 --- a/drivers/virtio/virtio_ring.c +++ b/drivers/virtio/virtio_ring.c @@ -3092,6 +3092,58 @@ void virtqueue_dma_unmap_single_attrs(struct virtqueue *_vq, dma_addr_t addr, } EXPORT_SYMBOL_GPL(virtqueue_dma_unmap_single_attrs); +/** + * virtqueue_dma_map_page_attrs - map DMA for _vq + * @_vq: the struct virtqueue we're talking about. + * @page: the page to do dma + * @offset: the offset inside the page + * @size: the size of the page to do dma + * @dir: DMA direction + * @attrs: DMA Attrs + * + * The caller calls this to do dma mapping in advance. The DMA address can be + * passed to this _vq when it is in pre-mapped mode. + * + * return DMA address. Caller should check that by virtqueue_dma_mapping_error(). + */ +dma_addr_t virtqueue_dma_map_page_attrs(struct virtqueue *_vq, struct page *page, + size_t offset, size_t size, + enum dma_data_direction dir, + unsigned long attrs) +{ + struct vring_virtqueue *vq = to_vvq(_vq); + + if (!vq->use_dma_api) + return page_to_phys(page) + offset; + + return dma_map_page_attrs(vring_dma_dev(vq), page, offset, size, dir, attrs); +} +EXPORT_SYMBOL_GPL(virtqueue_dma_map_page_attrs); + +/** + * virtqueue_dma_unmap_page_attrs - unmap DMA for _vq + * @_vq: the struct virtqueue we're talking about. + * @addr: the dma address to unmap + * @size: the size of the buffer + * @dir: DMA direction + * @attrs: DMA Attrs + * + * Unmap the address that is mapped by the virtqueue_dma_map_* APIs. + * + */ +void virtqueue_dma_unmap_page_attrs(struct virtqueue *_vq, dma_addr_t addr, + size_t size, enum dma_data_direction dir, + unsigned long attrs) +{ + struct vring_virtqueue *vq = to_vvq(_vq); + + if (!vq->use_dma_api) + return; + + dma_unmap_page_attrs(vring_dma_dev(vq), addr, size, dir, attrs); +} +EXPORT_SYMBOL_GPL(virtqueue_dma_unmap_page_attrs); + /** * virtqueue_dma_mapping_error - check dma address * @_vq: the struct virtqueue we're talking about. diff --git a/include/linux/virtio.h b/include/linux/virtio.h index b0201747a263..d92aa7be2c44 100644 --- a/include/linux/virtio.h +++ b/include/linux/virtio.h @@ -225,6 +225,13 @@ dma_addr_t virtqueue_dma_map_single_attrs(struct virtqueue *_vq, void *ptr, size void virtqueue_dma_unmap_single_attrs(struct virtqueue *_vq, dma_addr_t addr, size_t size, enum dma_data_direction dir, unsigned long attrs); +dma_addr_t virtqueue_dma_map_page_attrs(struct virtqueue *_vq, struct page *page, + size_t offset, size_t size, + enum dma_data_direction dir, + unsigned long attrs); +void virtqueue_dma_unmap_page_attrs(struct virtqueue *_vq, dma_addr_t addr, + size_t size, enum dma_data_direction dir, + unsigned long attrs); int virtqueue_dma_mapping_error(struct virtqueue *_vq, dma_addr_t addr); bool virtqueue_dma_need_sync(struct virtqueue *_vq, dma_addr_t addr);