diff options
| author | Xuan Zhuo <xuanzhuo@linux.alibaba.com> | 2023-08-10 20:30:55 +0800 |
|---|---|---|
| committer | Michael S. Tsirkin <mst@redhat.com> | 2023-09-03 18:10:23 -0400 |
| commit | b6253b4e21939f1bb54e8fdb84c23af9c3fb834a (patch) | |
| tree | 65657bdbbed52b9e2365cfb4f83e3e7064a69463 /include/linux/virtio.h | |
| parent | ba3e0c47c070c4cf010be9fb1e4eb669c744af11 (diff) | |
virtio_ring: introduce dma map api for virtqueue
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 <xuanzhuo@linux.alibaba.com>
Message-Id: <20230810123057.43407-11-xuanzhuo@linux.alibaba.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Diffstat (limited to 'include/linux/virtio.h')
| -rw-r--r-- | include/linux/virtio.h | 8 |
1 files changed, 8 insertions, 0 deletions
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 <linux/device.h> #include <linux/mod_devicetable.h> #include <linux/gfp.h> +#include <linux/dma-mapping.h> /** * 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 */ |