Implement .begin_access() and .end_access() callbacks.
For now these functions will simply sync/flush the CPU cache when needed.
Signed-off-by: Paul Cercueil paul@crapouillou.net
--- v5: New patch --- drivers/dma-buf/udmabuf.c | 27 +++++++++++++++++++++++++++ 1 file changed, 27 insertions(+)
diff --git a/drivers/dma-buf/udmabuf.c b/drivers/dma-buf/udmabuf.c index c40645999648..a87d89b58816 100644 --- a/drivers/dma-buf/udmabuf.c +++ b/drivers/dma-buf/udmabuf.c @@ -179,6 +179,31 @@ static int end_cpu_udmabuf(struct dma_buf *buf, return 0; }
+static int begin_udmabuf(struct dma_buf_attachment *attach, + struct sg_table *sgt, + enum dma_data_direction dir) +{ + struct dma_buf *buf = attach->dmabuf; + struct udmabuf *ubuf = buf->priv; + struct device *dev = ubuf->device->this_device; + + dma_sync_sg_for_device(dev, sgt->sgl, sg_nents(sgt->sgl), dir); + return 0; +} + +static int end_udmabuf(struct dma_buf_attachment *attach, + struct sg_table *sgt, + enum dma_data_direction dir) +{ + struct dma_buf *buf = attach->dmabuf; + struct udmabuf *ubuf = buf->priv; + struct device *dev = ubuf->device->this_device; + + if (dir != DMA_TO_DEVICE) + dma_sync_sg_for_cpu(dev, sgt->sgl, sg_nents(sgt->sgl), dir); + return 0; +} + static const struct dma_buf_ops udmabuf_ops = { .cache_sgt_mapping = true, .map_dma_buf = map_udmabuf, @@ -189,6 +214,8 @@ static const struct dma_buf_ops udmabuf_ops = { .vunmap = vunmap_udmabuf, .begin_cpu_access = begin_cpu_udmabuf, .end_cpu_access = end_cpu_udmabuf, + .begin_access = begin_udmabuf, + .end_access = end_udmabuf, };
#define SEALS_WANTED (F_SEAL_SHRINK)