[PATCH 1/3] drm/prime: forward begin_cpu_access callback to drivers

[Samuel Li <Samuel.Li@xxxxxxx>]

From: Christian König <christian.koenig@xxxxxxx>

Allow drivers to implement their own begin_cpu_access callback.

Change-Id: I97709b42b9351a04ee7e01106107a87bc56ea258
Signed-off-by: Christian König <christian.koenig@xxxxxxx>
---
 drivers/gpu/drm/drm_prime.c | 13 +++++++++++++
 include/drm/drm_drv.h       |  2 ++
 2 files changed, 15 insertions(+)

diff --git a/drivers/gpu/drm/drm_prime.c b/drivers/gpu/drm/drm_prime.c
index 8de93a2..b4b0e64 100644
--- a/drivers/gpu/drm/drm_prime.c
+++ b/drivers/gpu/drm/drm_prime.c
@@ -346,6 +346,18 @@ void drm_gem_dmabuf_release(struct dma_buf *dma_buf)
 }
 EXPORT_SYMBOL(drm_gem_dmabuf_release);
 
+static int drm_gem_dmabuf_begin_cpu_access(struct dma_buf *dma_buf,
+					    enum dma_data_direction direction)
+{
+	struct drm_gem_object *obj = dma_buf->priv;
+	struct drm_device *dev = obj->dev;
+
+	if (!dev->driver->gem_prime_begin_cpu_access)
+		return 0;
+
+	return dev->driver->gem_prime_begin_cpu_access(obj, direction);
+}
+
 static void *drm_gem_dmabuf_vmap(struct dma_buf *dma_buf)
 {
 	struct drm_gem_object *obj = dma_buf->priv;
@@ -403,6 +415,7 @@ static const struct dma_buf_ops drm_gem_prime_dmabuf_ops =  {
 	.map_dma_buf = drm_gem_map_dma_buf,
 	.unmap_dma_buf = drm_gem_unmap_dma_buf,
 	.release = drm_gem_dmabuf_release,
+	.begin_cpu_access = drm_gem_dmabuf_begin_cpu_access,
 	.map = drm_gem_dmabuf_kmap,
 	.map_atomic = drm_gem_dmabuf_kmap_atomic,
 	.unmap = drm_gem_dmabuf_kunmap,
diff --git a/include/drm/drm_drv.h b/include/drm/drm_drv.h
index 412e83a..1fbf298 100644
--- a/include/drm/drm_drv.h
+++ b/include/drm/drm_drv.h
@@ -475,6 +475,8 @@ struct drm_driver {
 				struct drm_device *dev,
 				struct dma_buf_attachment *attach,
 				struct sg_table *sgt);
+	int (*gem_prime_begin_cpu_access)(struct drm_gem_object *obj,
+					   enum dma_data_direction direction);
 	void *(*gem_prime_vmap)(struct drm_gem_object *obj);
 	void (*gem_prime_vunmap)(struct drm_gem_object *obj, void *vaddr);
 	int (*gem_prime_mmap)(struct drm_gem_object *obj,
-- 
2.7.4

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