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From: Xuan Zhuo <xuanzhuo@linux.alibaba.com>
To: virtualization@lists.linux-foundation.org
Cc: Xuan Zhuo <xuanzhuo@linux.alibaba.com>,
	Jesper Dangaard Brouer <hawk@kernel.org>,
	Daniel Borkmann <daniel@iogearbox.net>,
	"Michael S. Tsirkin" <mst@redhat.com>,
	netdev@vger.kernel.org, John Fastabend <john.fastabend@gmail.com>,
	Alexei Starovoitov <ast@kernel.org>,
	Christoph Hellwig <hch@infradead.org>,
	Alexander Lobakin <aleksander.lobakin@intel.com>,
	Jakub Kicinski <kuba@kernel.org>,
	bpf@vger.kernel.org, "David S. Miller" <davem@davemloft.net>
Subject: [PATCH vhost v7 08/11] virtio_ring: introduce virtqueue_dma_dev()
Date: Tue, 25 Apr 2023 15:36:10 +0800	[thread overview]
Message-ID: <20230425073613.8839-9-xuanzhuo@linux.alibaba.com> (raw)
In-Reply-To: <20230425073613.8839-1-xuanzhuo@linux.alibaba.com>

Added virtqueue_dma_dev() to get DMA device for virtio. Then the
caller can do dma operation in advance. The purpose is to keep memory
mapped across multiple add/get buf operations.

Signed-off-by: Xuan Zhuo <xuanzhuo@linux.alibaba.com>
---
 drivers/virtio/virtio_ring.c | 17 +++++++++++++++++
 include/linux/virtio.h       |  2 ++
 2 files changed, 19 insertions(+)

diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
index e7921b27bb01..871ac552b3b6 100644
--- a/drivers/virtio/virtio_ring.c
+++ b/drivers/virtio/virtio_ring.c
@@ -2325,6 +2325,23 @@ int virtqueue_add_inbuf_ctx(struct virtqueue *vq,
 }
 EXPORT_SYMBOL_GPL(virtqueue_add_inbuf_ctx);
 
+/**
+ * virtqueue_dma_dev - get the dma dev
+ * @_vq: the struct virtqueue we're talking about.
+ *
+ * Returns the dma dev. That can been used for dma api.
+ */
+struct device *virtqueue_dma_dev(struct virtqueue *_vq)
+{
+	struct vring_virtqueue *vq = to_vvq(_vq);
+
+	if (vq->use_dma_api)
+		return vring_dma_dev(vq);
+	else
+		return NULL;
+}
+EXPORT_SYMBOL_GPL(virtqueue_dma_dev);
+
 /**
  * virtqueue_kick_prepare - first half of split virtqueue_kick call.
  * @_vq: the struct virtqueue
diff --git a/include/linux/virtio.h b/include/linux/virtio.h
index b93238db94e3..5ebef5d50f04 100644
--- a/include/linux/virtio.h
+++ b/include/linux/virtio.h
@@ -61,6 +61,8 @@ int virtqueue_add_sgs(struct virtqueue *vq,
 		      void *data,
 		      gfp_t gfp);
 
+struct device *virtqueue_dma_dev(struct virtqueue *vq);
+
 bool virtqueue_kick(struct virtqueue *vq);
 
 bool virtqueue_kick_prepare(struct virtqueue *vq);
-- 
2.32.0.3.g01195cf9f

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WARNING: multiple messages have this Message-ID (diff)
From: Xuan Zhuo <xuanzhuo@linux.alibaba.com>
To: virtualization@lists.linux-foundation.org
Cc: "Michael S. Tsirkin" <mst@redhat.com>,
	Jason Wang <jasowang@redhat.com>,
	Xuan Zhuo <xuanzhuo@linux.alibaba.com>,
	Alexei Starovoitov <ast@kernel.org>,
	Daniel Borkmann <daniel@iogearbox.net>,
	"David S. Miller" <davem@davemloft.net>,
	Jesper Dangaard Brouer <hawk@kernel.org>,
	John Fastabend <john.fastabend@gmail.com>,
	netdev@vger.kernel.org, bpf@vger.kernel.org,
	Christoph Hellwig <hch@infradead.org>,
	Jakub Kicinski <kuba@kernel.org>,
	Alexander Lobakin <aleksander.lobakin@intel.com>
Subject: [PATCH vhost v7 08/11] virtio_ring: introduce virtqueue_dma_dev()
Date: Tue, 25 Apr 2023 15:36:10 +0800	[thread overview]
Message-ID: <20230425073613.8839-9-xuanzhuo@linux.alibaba.com> (raw)
In-Reply-To: <20230425073613.8839-1-xuanzhuo@linux.alibaba.com>

Added virtqueue_dma_dev() to get DMA device for virtio. Then the
caller can do dma operation in advance. The purpose is to keep memory
mapped across multiple add/get buf operations.

Signed-off-by: Xuan Zhuo <xuanzhuo@linux.alibaba.com>
---
 drivers/virtio/virtio_ring.c | 17 +++++++++++++++++
 include/linux/virtio.h       |  2 ++
 2 files changed, 19 insertions(+)

diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
index e7921b27bb01..871ac552b3b6 100644
--- a/drivers/virtio/virtio_ring.c
+++ b/drivers/virtio/virtio_ring.c
@@ -2325,6 +2325,23 @@ int virtqueue_add_inbuf_ctx(struct virtqueue *vq,
 }
 EXPORT_SYMBOL_GPL(virtqueue_add_inbuf_ctx);
 
+/**
+ * virtqueue_dma_dev - get the dma dev
+ * @_vq: the struct virtqueue we're talking about.
+ *
+ * Returns the dma dev. That can been used for dma api.
+ */
+struct device *virtqueue_dma_dev(struct virtqueue *_vq)
+{
+	struct vring_virtqueue *vq = to_vvq(_vq);
+
+	if (vq->use_dma_api)
+		return vring_dma_dev(vq);
+	else
+		return NULL;
+}
+EXPORT_SYMBOL_GPL(virtqueue_dma_dev);
+
 /**
  * virtqueue_kick_prepare - first half of split virtqueue_kick call.
  * @_vq: the struct virtqueue
diff --git a/include/linux/virtio.h b/include/linux/virtio.h
index b93238db94e3..5ebef5d50f04 100644
--- a/include/linux/virtio.h
+++ b/include/linux/virtio.h
@@ -61,6 +61,8 @@ int virtqueue_add_sgs(struct virtqueue *vq,
 		      void *data,
 		      gfp_t gfp);
 
+struct device *virtqueue_dma_dev(struct virtqueue *vq);
+
 bool virtqueue_kick(struct virtqueue *vq);
 
 bool virtqueue_kick_prepare(struct virtqueue *vq);
-- 
2.32.0.3.g01195cf9f


  parent reply	other threads:[~2023-04-25  7:36 UTC|newest]

Thread overview: 38+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-04-25  7:36 [PATCH vhost v7 00/11] virtio core prepares for AF_XDP Xuan Zhuo
2023-04-25  7:36 ` Xuan Zhuo
2023-04-25  7:36 ` [PATCH vhost v7 01/11] virtio_ring: split: separate dma codes Xuan Zhuo
2023-04-25  7:36   ` Xuan Zhuo
2023-05-01  4:24   ` Christoph Hellwig
2023-05-01  4:24     ` Christoph Hellwig
2023-05-06  3:08     ` Xuan Zhuo
2023-05-06  3:08       ` Xuan Zhuo
2023-04-25  7:36 ` [PATCH vhost v7 02/11] virtio_ring: packed: " Xuan Zhuo
2023-04-25  7:36   ` Xuan Zhuo
2023-04-25  7:36 ` [PATCH vhost v7 03/11] virtio_ring: packed-indirect: " Xuan Zhuo
2023-04-25  7:36   ` Xuan Zhuo
2023-04-25  7:36 ` [PATCH vhost v7 04/11] virtio_ring: split: support premapped Xuan Zhuo
2023-04-25  7:36   ` Xuan Zhuo
2023-04-25  7:36 ` [PATCH vhost v7 05/11] virtio_ring: packed: " Xuan Zhuo
2023-04-25  7:36   ` Xuan Zhuo
2023-04-25  7:36 ` [PATCH vhost v7 06/11] virtio_ring: packed-indirect: " Xuan Zhuo
2023-04-25  7:36   ` Xuan Zhuo
2023-04-25  7:36 ` [PATCH vhost v7 07/11] virtio_ring: update document for virtqueue_add_* Xuan Zhuo
2023-04-25  7:36   ` Xuan Zhuo
2023-04-25  7:36 ` Xuan Zhuo [this message]
2023-04-25  7:36   ` [PATCH vhost v7 08/11] virtio_ring: introduce virtqueue_dma_dev() Xuan Zhuo
2023-04-25  7:36 ` [PATCH vhost v7 09/11] virtio_ring: correct the expression of the description of virtqueue_resize() Xuan Zhuo
2023-04-25  7:36   ` Xuan Zhuo
2023-04-25  7:36 ` [PATCH vhost v7 10/11] virtio_ring: separate the logic of reset/enable from virtqueue_resize Xuan Zhuo
2023-04-25  7:36   ` Xuan Zhuo
2023-04-25  7:36 ` [PATCH vhost v7 11/11] virtio_ring: introduce virtqueue_reset() Xuan Zhuo
2023-04-25  7:36   ` Xuan Zhuo
2023-04-25  7:51 ` [PATCH vhost v7 00/11] virtio core prepares for AF_XDP Michael S. Tsirkin
2023-04-25  7:51   ` Michael S. Tsirkin
2023-04-25  8:05   ` Xuan Zhuo
2023-04-25  8:05     ` Xuan Zhuo
2023-04-25  8:13     ` Michael S. Tsirkin
2023-04-25  8:13       ` Michael S. Tsirkin
2023-04-25  8:21       ` Xuan Zhuo
2023-04-25  8:21         ` Xuan Zhuo
2023-04-25 12:40         ` Michael S. Tsirkin
2023-04-25 12:40           ` Michael S. Tsirkin

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