search for: sgl_alloc

Displaying 3 results from an estimated 3 matches for "sgl_alloc".

2020 Aug 20
2
[PATCH 05/28] media/v4l2: remove V4L2-FLAG-MEMORY-NON-CONSISTENT
...gather? You can implement that trivially implement it yourself for the iommu case: { merge_boundary = dma_get_merge_boundary(dev); if (!merge_boundary || merge_boundary > chunk_size - 1) { /* can't coalesce */ return -EINVAL; } nents = DIV_ROUND_UP(total_size, chunk_size); sg = sgl_alloc(); for_each_sgl() { sg->page = __alloc_pages(get_order(chunk_size)) sg->len = chunk_size; } dma_map_sg(sg, DMA_ATTR_SKIP_CPU_SYNC); // you are guaranteed to get a single dma_addr out } Of course this still uses the scatterlist structure with its annoying mix of input and output param...
2020 Aug 20
0
[PATCH 05/28] media/v4l2: remove V4L2-FLAG-MEMORY-NON-CONSISTENT
..._boundary = dma_get_merge_boundary(dev); > if (!merge_boundary || merge_boundary > chunk_size - 1) { > /* can't coalesce */ > return -EINVAL; > } > > > nents = DIV_ROUND_UP(total_size, chunk_size); > sg = sgl_alloc(); > for_each_sgl() { > sg->page = __alloc_pages(get_order(chunk_size)) > sg->len = chunk_size; > } > dma_map_sg(sg, DMA_ATTR_SKIP_CPU_SYNC); > // you are guaranteed to get a single dma_addr out > } > >...
2020 Aug 19
5
[PATCH 05/28] media/v4l2: remove V4L2-FLAG-MEMORY-NON-CONSISTENT
On Wed, Aug 19, 2020 at 1:51 PM Robin Murphy <robin.murphy at arm.com> wrote: > > Hi Tomasz, > > On 2020-08-19 12:16, Tomasz Figa wrote: > > Hi Christoph, > > > > On Wed, Aug 19, 2020 at 8:56 AM Christoph Hellwig <hch at lst.de> wrote: > >> > >> The V4L2-FLAG-MEMORY-NON-CONSISTENT flag is entirely unused, > > > > Could you