path: root/include/media/videobuf2-core.h
diff options
authorHans Verkuil <hans.verkuil@cisco.com>2013-03-01 15:44:20 -0300
committerMauro Carvalho Chehab <mchehab@redhat.com>2013-03-21 13:17:51 -0300
commitb6ba2057f7823352bbc44ee846faa03b36e8b6ac (patch)
tree130c5bafcd2e497c45d8a1e5e9e764dc88bff00c /include/media/videobuf2-core.h
parent808d24d6c0b5c30c8f804b251caf476ea63954ef (diff)
[media] videobuf2: add gfp_flags
Some drivers have special memory requirements for their buffers, usually related to DMA (e.g. GFP_DMA or __GFP_DMA32). Make it possible to specify additional GFP flags for those buffers by adding a gfp_flags field to vb2_queue. Note that this field will be replaced in the future with a different mechanism, but that is still work in progress and we need this feature now so we won't be able to convert drivers with such requirements to vb2. Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com> Acked-by: Marek Szyprowski <m.szyprowski@samsung.com> Acked-by: Federico Vaga <federico.vaga@gmail.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Diffstat (limited to 'include/media/videobuf2-core.h')
1 files changed, 8 insertions, 2 deletions
diff --git a/include/media/videobuf2-core.h b/include/media/videobuf2-core.h
index a2d427450780..d88a098d1aff 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
@@ -327,6 +332,7 @@ struct vb2_queue {
void *drv_priv;
unsigned int buf_struct_size;
u32 timestamp_type;
+ gfp_t gfp_flags;
/* private: internal use only */
enum v4l2_memory memory;

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