From: Xuan Zhuo <xuanzhuo@linux.alibaba.com>
To: virtualization@lists.linux.dev
Cc: "Richard Weinberger" <richard@nod.at>,
"Anton Ivanov" <anton.ivanov@cambridgegreys.com>,
"Johannes Berg" <johannes@sipsolutions.net>,
"Michael S. Tsirkin" <mst@redhat.com>,
"Jason Wang" <jasowang@redhat.com>,
"Xuan Zhuo" <xuanzhuo@linux.alibaba.com>,
"David S. Miller" <davem@davemloft.net>,
"Eric Dumazet" <edumazet@google.com>,
"Jakub Kicinski" <kuba@kernel.org>,
"Paolo Abeni" <pabeni@redhat.com>,
"Hans de Goede" <hdegoede@redhat.com>,
"Ilpo Järvinen" <ilpo.jarvinen@linux.intel.com>,
"Vadim Pasternak" <vadimp@nvidia.com>,
"Bjorn Andersson" <andersson@kernel.org>,
"Mathieu Poirier" <mathieu.poirier@linaro.org>,
"Cornelia Huck" <cohuck@redhat.com>,
"Halil Pasic" <pasic@linux.ibm.com>,
"Eric Farman" <farman@linux.ibm.com>,
"Heiko Carstens" <hca@linux.ibm.com>,
"Vasily Gorbik" <gor@linux.ibm.com>,
"Alexander Gordeev" <agordeev@linux.ibm.com>,
"Christian Borntraeger" <borntraeger@linux.ibm.com>,
"Sven Schnelle" <svens@linux.ibm.com>,
"Alexei Starovoitov" <ast@kernel.org>,
"Daniel Borkmann" <daniel@iogearbox.net>,
"Jesper Dangaard Brouer" <hawk@kernel.org>,
"John Fastabend" <john.fastabend@gmail.com>,
linux-um@lists.infradead.org, netdev@vger.kernel.org,
platform-driver-x86@vger.kernel.org,
linux-remoteproc@vger.kernel.org, linux-s390@vger.kernel.org,
kvm@vger.kernel.org, bpf@vger.kernel.org
Subject: [PATCH vhost v3 16/19] virtio_ring: introduce virtqueue_dma_map_sg_attrs
Date: Thu, 29 Feb 2024 15:20:41 +0800 [thread overview]
Message-ID: <20240229072044.77388-17-xuanzhuo@linux.alibaba.com> (raw)
In-Reply-To: <20240229072044.77388-1-xuanzhuo@linux.alibaba.com>
Introduce a helper to do dma map for scatterlist.
That can be used by other drivers.
Signed-off-by: Xuan Zhuo <xuanzhuo@linux.alibaba.com>
---
drivers/virtio/virtio_ring.c | 32 ++++++++++++++++++++++++++++++++
include/linux/virtio.h | 3 +++
2 files changed, 35 insertions(+)
diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
index df7633155558..3f790fa3d56a 100644
--- a/drivers/virtio/virtio_ring.c
+++ b/drivers/virtio/virtio_ring.c
@@ -3187,6 +3187,38 @@ int virtqueue_dma_mapping_error(struct virtqueue *_vq, dma_addr_t addr)
}
EXPORT_SYMBOL_GPL(virtqueue_dma_mapping_error);
+/**
+ * virtqueue_dma_map_sg_attrs - map scatterlist addr DMA for _vq
+ * @_vq: the struct virtqueue we're talking about.
+ * @sg: the scatterlist to do dma
+ * @dir: DMA direction
+ * @attrs: DMA Attrs
+ *
+ * The caller calls this to do dma mapping in advance. The sg can be
+ * passed to this _vq when it is in pre-mapped mode.
+ *
+ * Returns zero or a negative error.
+ * 0: success
+ * -ENOMEM: dma map error
+ */
+int virtqueue_dma_map_sg_attrs(struct virtqueue *_vq, struct scatterlist *sg,
+ enum dma_data_direction dir, unsigned long attrs)
+{
+ dma_addr_t addr;
+ int err;
+
+ addr = virtqueue_dma_map_page_attrs(_vq, sg_page(sg), sg->offset,
+ sg->length, dir, attrs);
+ err = virtqueue_dma_mapping_error(_vq, addr);
+ if (err)
+ return err;
+
+ sg->dma_address = addr;
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(virtqueue_dma_map_sg_attrs);
+
/**
* virtqueue_dma_need_sync - check a dma address needs sync
* @_vq: the struct virtqueue we're talking about.
diff --git a/include/linux/virtio.h b/include/linux/virtio.h
index b81b93b3eb27..5027eba82fda 100644
--- a/include/linux/virtio.h
+++ b/include/linux/virtio.h
@@ -233,6 +233,9 @@ void virtqueue_dma_unmap_page_attrs(struct virtqueue *_vq, dma_addr_t addr,
unsigned long attrs);
int virtqueue_dma_mapping_error(struct virtqueue *_vq, dma_addr_t addr);
+int virtqueue_dma_map_sg_attrs(struct virtqueue *_vq, struct scatterlist *sg,
+ enum dma_data_direction dir, unsigned long attrs);
+
bool virtqueue_dma_need_sync(struct virtqueue *_vq, dma_addr_t addr);
void virtqueue_dma_sync_single_range_for_cpu(struct virtqueue *_vq, dma_addr_t addr,
unsigned long offset, size_t size,
--
2.32.0.3.g01195cf9f
next prev parent reply other threads:[~2024-02-29 7:21 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-02-29 7:20 [PATCH vhost v3 00/19] virtio: drivers maintain dma info for premapped vq Xuan Zhuo
2024-02-29 7:20 ` [PATCH vhost v3 01/19] virtio_ring: introduce vring_need_unmap_buffer Xuan Zhuo
2024-02-29 7:20 ` [PATCH vhost v3 02/19] virtio_ring: packed: remove double check of the unmap ops Xuan Zhuo
2024-02-29 7:20 ` [PATCH vhost v3 03/19] virtio_ring: packed: structure the indirect desc table Xuan Zhuo
2024-02-29 7:20 ` [PATCH vhost v3 04/19] virtio_ring: split: remove double check of the unmap ops Xuan Zhuo
2024-02-29 7:20 ` [PATCH vhost v3 05/19] virtio_ring: split: structure the indirect desc table Xuan Zhuo
2024-02-29 7:20 ` [PATCH vhost v3 06/19] virtio_ring: no store dma info when unmap is not needed Xuan Zhuo
2024-02-29 7:20 ` [PATCH vhost v3 07/19] virtio: find_vqs: pass struct instead of multi parameters Xuan Zhuo
2024-02-29 7:20 ` [PATCH vhost v3 08/19] virtio: vring_create_virtqueue: " Xuan Zhuo
2024-02-29 7:20 ` [PATCH vhost v3 09/19] virtio: vring_new_virtqueue(): " Xuan Zhuo
2024-02-29 7:20 ` [PATCH vhost v3 10/19] virtio_ring: simplify the parameters of the funcs related to vring_create/new_virtqueue() Xuan Zhuo
2024-02-29 7:20 ` [PATCH vhost v3 11/19] virtio: find_vqs: add new parameter premapped Xuan Zhuo
2024-02-29 7:20 ` [PATCH vhost v3 12/19] virtio_ring: export premapped to driver by struct virtqueue Xuan Zhuo
2024-02-29 7:20 ` [PATCH vhost v3 13/19] virtio_net: set premapped mode by find_vqs() Xuan Zhuo
2024-02-29 7:20 ` [PATCH vhost v3 14/19] virtio_ring: remove api of setting vq premapped Xuan Zhuo
2024-02-29 7:20 ` [PATCH vhost v3 15/19] virtio_ring: introduce dma map api for page Xuan Zhuo
2024-02-29 7:20 ` Xuan Zhuo [this message]
2024-02-29 7:20 ` [PATCH vhost v3 17/19] virtio_net: unify the code for recycling the xmit ptr Xuan Zhuo
2024-02-29 7:20 ` [PATCH vhost v3 18/19] virtio_net: rename free_old_xmit_skbs to free_old_xmit Xuan Zhuo
2024-02-29 7:20 ` [PATCH vhost v3 19/19] virtio_net: sq support premapped mode Xuan Zhuo
2024-02-29 8:21 ` [PATCH vhost v3 00/19] virtio: drivers maintain dma info for premapped vq Michael S. Tsirkin
2024-02-29 9:02 ` Xuan Zhuo
2024-02-29 9:34 ` Michael S. Tsirkin
2024-02-29 9:36 ` Xuan Zhuo
2024-02-29 9:41 ` Johannes Berg
2024-02-29 9:42 ` Xuan Zhuo
2024-03-06 9:54 ` Xuan Zhuo
2024-03-07 5:28 ` Jason Wang
2024-03-07 8:06 ` Xuan Zhuo
2024-03-08 6:03 ` Jason Wang
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