netdev - [PATCH vhost 02/22] virtio_ring: introduce virtqueue_dma_[un]map_page

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Message-Id: <20231011092728.105904-3-xuanzhuo@linux.alibaba.com>
Date: Wed, 11 Oct 2023 17:27:08 +0800
From: Xuan Zhuo <xuanzhuo@...ux.alibaba.com>
To: virtualization@...ts.linux-foundation.org
Cc: "David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	"Michael S. Tsirkin" <mst@...hat.com>,
	Jason Wang <jasowang@...hat.com>,
	Xuan Zhuo <xuanzhuo@...ux.alibaba.com>,
	Alexei Starovoitov <ast@...nel.org>,
	Daniel Borkmann <daniel@...earbox.net>,
	Jesper Dangaard Brouer <hawk@...nel.org>,
	John Fastabend <john.fastabend@...il.com>,
	netdev@...r.kernel.org,
	bpf@...r.kernel.org
Subject: [PATCH vhost 02/22] virtio_ring: introduce virtqueue_dma_[un]map_page_attrs

Introduce virtqueue_dma_[un]map_page_attrs() to do dma/unmap for pages.

Signed-off-by: Xuan Zhuo <xuanzhuo@...ux.alibaba.com>
---
 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 b3ded56722f4..36aae63336b8 100644
--- a/drivers/virtio/virtio_ring.c
+++ b/drivers/virtio/virtio_ring.c
@@ -3111,6 +3111,58 @@ const struct vring *virtqueue_get_vring(const struct virtqueue *vq)
 }
 EXPORT_SYMBOL_GPL(virtqueue_get_vring);
 
+/**
+ * virtqueue_dma_map_page_attrs - map page 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 (dma_addr_t)(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 page 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_map_single_attrs - map DMA for _vq
  * @_vq: the struct virtqueue we're talking about.
diff --git a/include/linux/virtio.h b/include/linux/virtio.h
index 1cf7b004348b..d7c7f4fdee2f 100644
--- a/include/linux/virtio.h
+++ b/include/linux/virtio.h
@@ -212,6 +212,13 @@ void unregister_virtio_driver(struct virtio_driver *drv);
 	module_driver(__virtio_driver, register_virtio_driver, \
 			unregister_virtio_driver)
 
+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);
 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,
-- 
2.32.0.3.g01195cf9f