[media] vb2: add a dev field to use for the default allocation context

The allocation context is nothing more than a per-plane device pointer
to use when allocating buffers. So just provide a dev pointer in vb2_queue
for that purpose and drivers can skip allocating/releasing/filling in
the allocation context unless they require different per-plane device
pointers as used by some Samsung SoCs.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Cc: Sakari Ailus <sakari.ailus@iki.fi>
Cc: Florian Echtler <floe@butterbrot.org>
Cc: Federico Vaga <federico.vaga@gmail.com>
Cc: "Lad, Prabhakar" <prabhakar.csengg@gmail.com>
Cc: Scott Jiang <scott.jiang.linux@gmail.com>
Acked-by: Philipp Zabel <p.zabel@pengutronix.de>
Cc: Fabien Dessenne <fabien.dessenne@st.com>
Acked-by: Benoit Parrot <bparrot@ti.com>
Cc: Mikhail Ulyanov <mikhail.ulyanov@cogentembedded.com>
Cc: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Ludovic Desroches <ludovic.desroches@atmel.com>
Cc: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Cc: Kyungmin Park <kyungmin.park@samsung.com>
Cc: Sylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

diff --git a/drivers/media/v4l2-core/videobuf2-core.c b/drivers/media/v4l2-core/videobuf2-core.c
index 36f4392df57135e8fa3a0f090a087eeda5ad50a9..aabb03e406f0d50f49cdc566ea1c2720200e51eb 100644 (file)
--- a/drivers/media/v4l2-core/videobuf2-core.c
+++ b/drivers/media/v4l2-core/videobuf2-core.c
@@ -206,7 +206,8 @@ static int __vb2_buf_mem_alloc(struct vb2_buffer *vb)
        for (plane = 0; plane < vb->num_planes; ++plane) {
                unsigned long size = PAGE_ALIGN(vb->planes[plane].length);
 
-               mem_priv = call_ptr_memop(vb, alloc, q->alloc_ctx[plane],
+               mem_priv = call_ptr_memop(vb, alloc,
+                               q->alloc_ctx[plane] ? : &q->dev,
                                q->dma_attrs, size, dma_dir, q->gfp_flags);
                if (IS_ERR_OR_NULL(mem_priv))
                        goto free;
@@ -1131,9 +1132,10 @@ static int __qbuf_userptr(struct vb2_buffer *vb, const void *pb)
                vb->planes[plane].data_offset = 0;
 
                /* Acquire each plane's memory */
-               mem_priv = call_ptr_memop(vb, get_userptr, q->alloc_ctx[plane],
-                                     planes[plane].m.userptr,
-                                     planes[plane].length, dma_dir);
+               mem_priv = call_ptr_memop(vb, get_userptr,
+                               q->alloc_ctx[plane] ? : &q->dev,
+                               planes[plane].m.userptr,
+                               planes[plane].length, dma_dir);
                if (IS_ERR_OR_NULL(mem_priv)) {
                        dprintk(1, "failed acquiring userspace "
                                                "memory for plane %d\n", plane);
@@ -1256,8 +1258,8 @@ static int __qbuf_dmabuf(struct vb2_buffer *vb, const void *pb)
 
                /* Acquire each plane's memory */
                mem_priv = call_ptr_memop(vb, attach_dmabuf,
-                       q->alloc_ctx[plane], dbuf, planes[plane].length,
-                       dma_dir);
+                               q->alloc_ctx[plane] ? : &q->dev,
+                               dbuf, planes[plane].length, dma_dir);
                if (IS_ERR(mem_priv)) {
                        dprintk(1, "failed to attach dmabuf\n");
                        ret = PTR_ERR(mem_priv);

diff --git a/include/media/videobuf2-core.h b/include/media/videobuf2-core.h
index 444ef3b9d39f918c847a7c306adc8a1dfd2f3236..d38668c2ea06b36a6677e927c7cd0a2d80dcc059 100644 (file)
--- a/include/media/videobuf2-core.h
+++ b/include/media/videobuf2-core.h
@@ -400,6 +400,8 @@ struct vb2_buf_ops {
  *             caller. For example, for V4L2, it should match
  *             the V4L2_BUF_TYPE_* in include/uapi/linux/videodev2.h
  * @io_modes:  supported io methods (see vb2_io_modes enum)
+ * @dev:       device to use for the default allocation context if the driver
+ *             doesn't fill in the @alloc_ctx array.
  * @dma_attrs: DMA attributes to use for the DMA. May be NULL.
  * @fileio_read_once:          report EOF after reading the first buffer
  * @fileio_write_immediately:  queue buffer after each write() call
@@ -467,6 +469,7 @@ struct vb2_buf_ops {
 struct vb2_queue {
        unsigned int                    type;
        unsigned int                    io_modes;
+       struct device                   *dev;
        const struct dma_attrs          *dma_attrs;
        unsigned                        fileio_read_once:1;
        unsigned                        fileio_write_immediately:1;