netdev - [PATCH 08/33] virtio_ring: introduce dma sync api for virtio

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Date:   Thu,  2 Feb 2023 19:00:33 +0800
From:   Xuan Zhuo <xuanzhuo@...ux.alibaba.com>
To:     netdev@...r.kernel.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>,
        Björn Töpel <bjorn@...nel.org>,
        Magnus Karlsson <magnus.karlsson@...el.com>,
        Maciej Fijalkowski <maciej.fijalkowski@...el.com>,
        Jonathan Lemon <jonathan.lemon@...il.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Jesper Dangaard Brouer <hawk@...nel.org>,
        John Fastabend <john.fastabend@...il.com>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Menglong Dong <imagedong@...cent.com>,
        Kuniyuki Iwashima <kuniyu@...zon.com>,
        Petr Machata <petrm@...dia.com>,
        virtualization@...ts.linux-foundation.org, bpf@...r.kernel.org
Subject: [PATCH 08/33] virtio_ring: introduce dma sync api for virtio

In the process of dma sync, we involved whether virtio uses dma api. On
the other hand, it is also necessary to read vdev->dev.parent. So these
API has been introduced.

Signed-off-by: Xuan Zhuo <xuanzhuo@...ux.alibaba.com>
---
 drivers/virtio/virtio_ring.c | 61 ++++++++++++++++++++++++++++++++++++
 include/linux/virtio.h       |  8 +++++
 2 files changed, 69 insertions(+)

diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
index 67eda7bc23ea..7b393133fd27 100644
--- a/drivers/virtio/virtio_ring.c
+++ b/drivers/virtio/virtio_ring.c
@@ -3102,4 +3102,65 @@ void virtio_dma_unmap(struct device *dev, dma_addr_t dma, unsigned int length,
 }
 EXPORT_SYMBOL_GPL(virtio_dma_unmap);
 
+/**
+ * virtio_dma_need_sync - check dma address need sync
+ * @dev: virtio device
+ * @addr: DMA address
+ */
+bool virtio_dma_need_sync(struct device *dev, dma_addr_t addr)
+{
+	struct virtio_device *vdev = dev_to_virtio(dev);
+
+	if (!vring_use_dma_api(vdev))
+		return 0;
+
+	return dma_need_sync(vdev->dev.parent, addr);
+}
+EXPORT_SYMBOL_GPL(virtio_dma_need_sync);
+
+/**
+ * virtio_dma_sync_signle_range_for_cpu - dma sync for cpu
+ * @dev: virtio device
+ * @addr: DMA address
+ * @offset: DMA address offset
+ * @size: mem size for sync
+ * @dir: DMA direction
+ *
+ * Before calling this function, use virtio_dma_need_sync() to confirm that the
+ * DMA address really needs to be synchronized
+ */
+void virtio_dma_sync_signle_range_for_cpu(struct device *dev, dma_addr_t addr,
+					  unsigned long offset, size_t size,
+					  enum dma_data_direction dir)
+{
+	struct virtio_device *vdev = dev_to_virtio(dev);
+
+	dma_sync_single_range_for_cpu(vdev->dev.parent, addr, offset,
+				      size, DMA_BIDIRECTIONAL);
+}
+EXPORT_SYMBOL_GPL(virtio_dma_sync_signle_range_for_cpu);
+
+/**
+ * virtio_dma_sync_signle_range_for_device - dma sync for device
+ * @dev: virtio device
+ * @addr: DMA address
+ * @offset: DMA address offset
+ * @size: mem size for sync
+ * @dir: DMA direction
+ *
+ * Before calling this function, use virtio_dma_need_sync() to confirm that the
+ * DMA address really needs to be synchronized
+ */
+void virtio_dma_sync_signle_range_for_device(struct device *dev,
+					     dma_addr_t addr,
+					     unsigned long offset, size_t size,
+					     enum dma_data_direction dir)
+{
+	struct virtio_device *vdev = dev_to_virtio(dev);
+
+	dma_sync_single_range_for_device(vdev->dev.parent, addr, offset,
+					 size, DMA_BIDIRECTIONAL);
+}
+EXPORT_SYMBOL_GPL(virtio_dma_sync_signle_range_for_device);
+
 MODULE_LICENSE("GPL");
diff --git a/include/linux/virtio.h b/include/linux/virtio.h
index ce89126becc5..8c2fae318b0c 100644
--- a/include/linux/virtio.h
+++ b/include/linux/virtio.h
@@ -227,4 +227,12 @@ dma_addr_t virtio_dma_map(struct device *dev, void *addr, unsigned int length,
 int virtio_dma_mapping_error(struct device *dev, dma_addr_t addr);
 void virtio_dma_unmap(struct device *dev, dma_addr_t dma, unsigned int length,
 		      enum dma_data_direction dir);
+bool virtio_dma_need_sync(struct device *dev, dma_addr_t addr);
+void virtio_dma_sync_signle_range_for_cpu(struct device *dev, dma_addr_t addr,
+					  unsigned long offset, size_t size,
+					  enum dma_data_direction dir);
+void virtio_dma_sync_signle_range_for_device(struct device *dev,
+					     dma_addr_t addr,
+					     unsigned long offset, size_t size,
+					     enum dma_data_direction dir);
 #endif /* _LINUX_VIRTIO_H */
-- 
2.32.0.3.g01195cf9f