Hi all, This patch is based on an idea from Federico:
http://www.mail-archive.com/davinci-linux-open-source@linux.davincidsp.com/msg24669.html While working on converting the solo6x10 driver to vb2 I realized that the same thing was needed for the dma-sg case: the solo6x10 has 32-bit PCI DMA, so you want to specify __GFP_DMA32 to prevent bounce buffers from being created. Rather than patching all drivers as the patch above does (error prone IMHO), I've decided to just add a gfp_flags field to vb2_queue and pass that to the alloc mem_op. The various alloc implementations will just OR it in. This is urgently needed for any driver with DMA32 restrictions (which are most PCI drivers). Comments? Regards, Hans diff --git a/drivers/media/v4l2-core/videobuf2-core.c b/drivers/media/v4l2-core/videobuf2-core.c index db1235d..adde3e6 100644 --- a/drivers/media/v4l2-core/videobuf2-core.c +++ b/drivers/media/v4l2-core/videobuf2-core.c @@ -57,7 +57,7 @@ static int __vb2_buf_mem_alloc(struct vb2_buffer *vb) /* Allocate memory for all planes in this buffer */ for (plane = 0; plane < vb->num_planes; ++plane) { mem_priv = call_memop(q, alloc, q->alloc_ctx[plane], - q->plane_sizes[plane]); + q->plane_sizes[plane], q->gfp_flags); if (IS_ERR_OR_NULL(mem_priv)) goto free; diff --git a/drivers/media/v4l2-core/videobuf2-dma-contig.c b/drivers/media/v4l2-core/videobuf2-dma-contig.c index 10beaee..ae35d25 100644 --- a/drivers/media/v4l2-core/videobuf2-dma-contig.c +++ b/drivers/media/v4l2-core/videobuf2-dma-contig.c @@ -152,7 +152,7 @@ static void vb2_dc_put(void *buf_priv) kfree(buf); } -static void *vb2_dc_alloc(void *alloc_ctx, unsigned long size) +static void *vb2_dc_alloc(void *alloc_ctx, unsigned long size, gfp_t gfp_flags) { struct vb2_dc_conf *conf = alloc_ctx; struct device *dev = conf->dev; @@ -165,7 +165,8 @@ static void *vb2_dc_alloc(void *alloc_ctx, unsigned long size) /* align image size to PAGE_SIZE */ size = PAGE_ALIGN(size); - buf->vaddr = dma_alloc_coherent(dev, size, &buf->dma_addr, GFP_KERNEL); + buf->vaddr = dma_alloc_coherent(dev, size, &buf->dma_addr, + GFP_KERNEL | gfp_flags); if (!buf->vaddr) { dev_err(dev, "dma_alloc_coherent of size %ld failed\n", size); kfree(buf); diff --git a/drivers/media/v4l2-core/videobuf2-dma-sg.c b/drivers/media/v4l2-core/videobuf2-dma-sg.c index 25c3b36..952776f 100644 --- a/drivers/media/v4l2-core/videobuf2-dma-sg.c +++ b/drivers/media/v4l2-core/videobuf2-dma-sg.c @@ -33,7 +33,7 @@ struct vb2_dma_sg_buf { static void vb2_dma_sg_put(void *buf_priv); -static void *vb2_dma_sg_alloc(void *alloc_ctx, unsigned long size) +static void *vb2_dma_sg_alloc(void *alloc_ctx, unsigned long size, gfp_t gfp_flags) { struct vb2_dma_sg_buf *buf; int i; @@ -60,7 +60,8 @@ static void *vb2_dma_sg_alloc(void *alloc_ctx, unsigned long size) goto fail_pages_array_alloc; for (i = 0; i < buf->sg_desc.num_pages; ++i) { - buf->pages[i] = alloc_page(GFP_KERNEL | __GFP_ZERO | __GFP_NOWARN); + buf->pages[i] = alloc_page(GFP_KERNEL | __GFP_ZERO | + __GFP_NOWARN | gfp_flags); if (NULL == buf->pages[i]) goto fail_pages_alloc; sg_set_page(&buf->sg_desc.sglist[i], diff --git a/drivers/media/v4l2-core/videobuf2-vmalloc.c b/drivers/media/v4l2-core/videobuf2-vmalloc.c index a47fd4f..313d977 100644 --- a/drivers/media/v4l2-core/videobuf2-vmalloc.c +++ b/drivers/media/v4l2-core/videobuf2-vmalloc.c @@ -35,11 +35,11 @@ struct vb2_vmalloc_buf { static void vb2_vmalloc_put(void *buf_priv); -static void *vb2_vmalloc_alloc(void *alloc_ctx, unsigned long size) +static void *vb2_vmalloc_alloc(void *alloc_ctx, unsigned long size, gfp_t gfp_flags) { struct vb2_vmalloc_buf *buf; - buf = kzalloc(sizeof(*buf), GFP_KERNEL); + buf = kzalloc(sizeof(*buf), GFP_KERNEL | gfp_flags); if (!buf) return NULL; diff --git a/include/media/videobuf2-core.h b/include/media/videobuf2-core.h index 9cfd4ee..251d66b 100644 --- a/include/media/videobuf2-core.h +++ b/include/media/videobuf2-core.h @@ -27,7 +27,9 @@ struct vb2_fileio_data; * return NULL on failure or a pointer to allocator private, * per-buffer data on success; the returned private structure * will then be passed as buf_priv argument to other ops in this - * structure + * structure. Additional gfp_flags to use when allocating the + * are also passed to this operation. These flags are from the + * gfp_flags field of vb2_queue. * @put: inform the allocator that the buffer will no longer be used; * usually will result in the allocator freeing the buffer (if * no other users of this buffer are present); the buf_priv @@ -79,7 +81,7 @@ struct vb2_fileio_data; * unmap_dmabuf. */ struct vb2_mem_ops { - void *(*alloc)(void *alloc_ctx, unsigned long size); + void *(*alloc)(void *alloc_ctx, unsigned long size, gfp_t gfp_flags); void (*put)(void *buf_priv); struct dma_buf *(*get_dmabuf)(void *buf_priv); @@ -302,6 +304,9 @@ struct v4l2_fh; * @buf_struct_size: size of the driver-specific buffer structure; * "0" indicates the driver doesn't want to use a custom buffer * structure type, so sizeof(struct vb2_buffer) will is used + * @gfp_flags: additional gfp flags used when allocating the buffers. + * Typically this is 0, but it may be e.g. GFP_DMA or __GFP_DMA32 + * to force the buffer allocation to a specific memory zone. * * @memory: current memory type used * @bufs: videobuf buffer structures @@ -326,6 +331,7 @@ struct vb2_queue { const struct vb2_mem_ops *mem_ops; void *drv_priv; unsigned int buf_struct_size; + gfp_t gfp_flags; /* private: internal use only */ enum v4l2_memory memory; -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
