From patchwork Thu Aug 10 12:30:55 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Xuan Zhuo X-Patchwork-Id: 13349376 Received: from lindbergh.monkeyblade.net (lindbergh.monkeyblade.net [23.128.96.19]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 3B4742515A; Thu, 10 Aug 2023 12:31:19 +0000 (UTC) Received: from out30-97.freemail.mail.aliyun.com (out30-97.freemail.mail.aliyun.com [115.124.30.97]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 086E91B4; Thu, 10 Aug 2023 05:31:16 -0700 (PDT) X-Alimail-AntiSpam: AC=PASS;BC=-1|-1;BR=01201311R191e4;CH=green;DM=||false|;DS=||;FP=0|-1|-1|-1|0|-1|-1|-1;HT=ay29a033018045170;MF=xuanzhuo@linux.alibaba.com;NM=1;PH=DS;RN=15;SR=0;TI=SMTPD_---0VpTnUa2_1691670671; Received: from localhost(mailfrom:xuanzhuo@linux.alibaba.com fp:SMTPD_---0VpTnUa2_1691670671) by smtp.aliyun-inc.com; Thu, 10 Aug 2023 20:31:12 +0800 From: Xuan Zhuo To: virtualization@lists.linux-foundation.org Cc: "Michael S. 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, Christoph Hellwig Subject: [PATCH vhost v13 10/12] virtio_ring: introduce dma map api for virtqueue Date: Thu, 10 Aug 2023 20:30:55 +0800 Message-Id: <20230810123057.43407-11-xuanzhuo@linux.alibaba.com> X-Mailer: git-send-email 2.32.0.3.g01195cf9f In-Reply-To: <20230810123057.43407-1-xuanzhuo@linux.alibaba.com> References: <20230810123057.43407-1-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: 6ea114ee5d47 X-Spam-Status: No, score=-9.9 required=5.0 tests=BAYES_00, ENV_AND_HDR_SPF_MATCH,RCVD_IN_DNSWL_BLOCKED,SPF_HELO_NONE,SPF_PASS, UNPARSEABLE_RELAY,USER_IN_DEF_SPF_WL autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Added virtqueue_dma_map_api* to map DMA addresses for virtual memory in advance. The purpose is to keep memory mapped across multiple add/get buf operations. Signed-off-by: Xuan Zhuo --- drivers/virtio/virtio_ring.c | 69 ++++++++++++++++++++++++++++++++++++ include/linux/virtio.h | 8 +++++ 2 files changed, 77 insertions(+) diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c index 639c20b19e06..916479c9c72c 100644 --- a/drivers/virtio/virtio_ring.c +++ b/drivers/virtio/virtio_ring.c @@ -3106,4 +3106,73 @@ const struct vring *virtqueue_get_vring(const struct virtqueue *vq) } EXPORT_SYMBOL_GPL(virtqueue_get_vring); +/** + * virtqueue_dma_map_single_attrs - map DMA for _vq + * @_vq: the struct virtqueue we're talking about. + * @ptr: the pointer of the buffer to do dma + * @size: the size of the buffer 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_single_attrs(struct virtqueue *_vq, void *ptr, + 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_addr_t)virt_to_phys(ptr); + + return dma_map_single_attrs(vring_dma_dev(vq), ptr, size, dir, attrs); +} +EXPORT_SYMBOL_GPL(virtqueue_dma_map_single_attrs); + +/** + * virtqueue_dma_unmap_single_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_single_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_single_attrs(vring_dma_dev(vq), addr, size, dir, attrs); +} +EXPORT_SYMBOL_GPL(virtqueue_dma_unmap_single_attrs); + +/** + * virtqueue_dma_mapping_error - check dma address + * @_vq: the struct virtqueue we're talking about. + * @addr: DMA address + * + * Returns 0 means dma valid. Other means invalid dma address. + */ +int virtqueue_dma_mapping_error(struct virtqueue *_vq, dma_addr_t addr) +{ + struct vring_virtqueue *vq = to_vvq(_vq); + + if (!vq->use_dma_api) + return 0; + + return dma_mapping_error(vring_dma_dev(vq), addr); +} +EXPORT_SYMBOL_GPL(virtqueue_dma_mapping_error); + MODULE_LICENSE("GPL"); diff --git a/include/linux/virtio.h b/include/linux/virtio.h index 49a640e0a6f4..79e3c74391e0 100644 --- a/include/linux/virtio.h +++ b/include/linux/virtio.h @@ -9,6 +9,7 @@ #include #include #include +#include /** * struct virtqueue - a queue to register buffers for sending or receiving. @@ -212,4 +213,11 @@ void unregister_virtio_driver(struct virtio_driver *drv); #define module_virtio_driver(__virtio_driver) \ module_driver(__virtio_driver, register_virtio_driver, \ unregister_virtio_driver) + +dma_addr_t virtqueue_dma_map_single_attrs(struct virtqueue *_vq, void *ptr, size_t size, + enum dma_data_direction dir, unsigned long attrs); +void virtqueue_dma_unmap_single_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); #endif /* _LINUX_VIRTIO_H */