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| author | Maxime Coquelin <maxime.coquelin@redhat.com> | 2024-02-19 18:06:06 +0100 |
|---|---|---|
| committer | Michael S. Tsirkin <mst@redhat.com> | 2024-03-19 07:45:49 +0100 |
| commit | d7b4e3287ca3a7baf66efd9158498e551a9550da (patch) | |
| tree | 8175cee3b84db3c9bafb4ba10b9626945475359b /drivers/vdpa/vdpa_user/vduse_dev.c | |
| parent | vdpa/mlx5: Allow CVQ size changes (diff) | |
| download | linux-d7b4e3287ca3a7baf66efd9158498e551a9550da.tar.xz linux-d7b4e3287ca3a7baf66efd9158498e551a9550da.zip | |
vduse: implement DMA sync callbacks
Since commit 295525e29a5b ("virtio_net: merge dma
operations when filling mergeable buffers"), VDUSE device
require support for DMA's .sync_single_for_cpu() operation
as the memory is non-coherent between the device and CPU
because of the use of a bounce buffer.
This patch implements both .sync_single_for_cpu() and
.sync_single_for_device() callbacks, and also skip bounce
buffer copies during DMA map and unmap operations if the
DMA_ATTR_SKIP_CPU_SYNC attribute is set to avoid extra
copies of the same buffer.
Signed-off-by: Maxime Coquelin <maxime.coquelin@redhat.com>
Message-Id: <20240219170606.587290-1-maxime.coquelin@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Diffstat (limited to '')
| -rw-r--r-- | drivers/vdpa/vdpa_user/vduse_dev.c | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/drivers/vdpa/vdpa_user/vduse_dev.c b/drivers/vdpa/vdpa_user/vduse_dev.c index 1d24da79c399..75354ce186a1 100644 --- a/drivers/vdpa/vdpa_user/vduse_dev.c +++ b/drivers/vdpa/vdpa_user/vduse_dev.c @@ -798,6 +798,26 @@ static const struct vdpa_config_ops vduse_vdpa_config_ops = { .free = vduse_vdpa_free, }; +static void vduse_dev_sync_single_for_device(struct device *dev, + dma_addr_t dma_addr, size_t size, + enum dma_data_direction dir) +{ + struct vduse_dev *vdev = dev_to_vduse(dev); + struct vduse_iova_domain *domain = vdev->domain; + + vduse_domain_sync_single_for_device(domain, dma_addr, size, dir); +} + +static void vduse_dev_sync_single_for_cpu(struct device *dev, + dma_addr_t dma_addr, size_t size, + enum dma_data_direction dir) +{ + struct vduse_dev *vdev = dev_to_vduse(dev); + struct vduse_iova_domain *domain = vdev->domain; + + vduse_domain_sync_single_for_cpu(domain, dma_addr, size, dir); +} + static dma_addr_t vduse_dev_map_page(struct device *dev, struct page *page, unsigned long offset, size_t size, enum dma_data_direction dir, @@ -858,6 +878,8 @@ static size_t vduse_dev_max_mapping_size(struct device *dev) } static const struct dma_map_ops vduse_dev_dma_ops = { + .sync_single_for_device = vduse_dev_sync_single_for_device, + .sync_single_for_cpu = vduse_dev_sync_single_for_cpu, .map_page = vduse_dev_map_page, .unmap_page = vduse_dev_unmap_page, .alloc = vduse_dev_alloc_coherent, |