drm/exynos: add cache operation backend callbacks

Signed-off-by: Inki Dae <inki.dae@samsung.com>

diff --git a/drivers/gpu/drm/exynos/exynos_drm_dmabuf.c b/drivers/gpu/drm/exynos/exynos_drm_dmabuf.c
index f26861e..99ff8dc 100644 (file)
--- a/drivers/gpu/drm/exynos/exynos_drm_dmabuf.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_dmabuf.c
@@ -129,6 +129,38 @@ static void exynos_gem_unmap_dma_buf(struct dma_buf_attachment *attach,
        /* Nothing to do. */
 }
 
+static int exynos_gem_begin_cpu_access(struct dma_buf *dmabuf, size_t start,
+                                       size_t len, enum dma_data_direction dir)
+{
+       struct exynos_drm_gem_obj *exynos_gem_obj = dmabuf->priv;
+       struct exynos_drm_gem_buf *buf = exynos_gem_obj->buffer;
+       struct drm_device *drm_dev = exynos_gem_obj->base.dev;
+
+       if (dma_get_attr(DMA_ATTR_SKIP_CPU_SYNC, &buf->dma_attrs))
+               return 0;
+
+       /* TODO. need to optimize cache operation. */
+       dma_sync_sg_for_cpu(drm_dev->dev, buf->sgt->sgl, buf->sgt->orig_nents,
+                               dir);
+
+       return 0;
+}
+
+static void exynos_gem_end_cpu_access(struct dma_buf *dmabuf, size_t start,
+                                       size_t len, enum dma_data_direction dir)
+{
+       struct exynos_drm_gem_obj *exynos_gem_obj = dmabuf->priv;
+       struct exynos_drm_gem_buf *buf = exynos_gem_obj->buffer;
+       struct drm_device *drm_dev = exynos_gem_obj->base.dev;
+
+       if (dma_get_attr(DMA_ATTR_SKIP_CPU_SYNC, &buf->dma_attrs))
+               return;
+
+       /* TODO. need to optimize cache operation. */
+       dma_sync_sg_for_device(drm_dev->dev, buf->sgt->sgl, buf->sgt->orig_nents,
+                               dir);
+}
+
 static void exynos_dmabuf_release(struct dma_buf *dmabuf)
 {
        struct exynos_drm_gem_obj *exynos_gem_obj = dmabuf->priv;
@@ -192,6 +224,8 @@ static struct dma_buf_ops exynos_dmabuf_ops = {
        .detach                 = exynos_gem_detach_dma_buf,
        .map_dma_buf            = exynos_gem_map_dma_buf,
        .unmap_dma_buf          = exynos_gem_unmap_dma_buf,
+       .begin_cpu_access       = exynos_gem_begin_cpu_access,
+       .end_cpu_access         = exynos_gem_end_cpu_access,
        .kmap                   = exynos_gem_dmabuf_kmap,
        .kmap_atomic            = exynos_gem_dmabuf_kmap_atomic,
        .kunmap                 = exynos_gem_dmabuf_kunmap,