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authorThierry Reding <treding@nvidia.com>2017-12-13 12:25:14 +0100
committerThierry Reding <treding@nvidia.com>2018-03-17 00:04:20 +0100
commit27e92f1f1600c214bf649daddb9b88b68330a8d1 (patch)
tree335e19386efa2e99e5edc2a9cd4a69e3961f0b9d /drivers/gpu/drm
parentbd43c9f0fa1f664b58eefdc8aab7ac3c8b2026ec (diff)
drm/tegra: prime: Implement ->{begin,end}_cpu_access()
These callbacks allow the exporter to swap in and pin the backing storage for buffers as well as invalidate the cache in preparation for accessing the buffer from the CPU, and flush the cache and unpin the backing storage when the CPU is done modifying the buffer. Signed-off-by: Thierry Reding <treding@nvidia.com>
Diffstat (limited to 'drivers/gpu/drm')
-rw-r--r--drivers/gpu/drm/tegra/gem.c30
1 files changed, 30 insertions, 0 deletions
diff --git a/drivers/gpu/drm/tegra/gem.c b/drivers/gpu/drm/tegra/gem.c
index 8fc5860ab19a..8b0b4ff64bb4 100644
--- a/drivers/gpu/drm/tegra/gem.c
+++ b/drivers/gpu/drm/tegra/gem.c
@@ -568,6 +568,34 @@ static void tegra_gem_prime_release(struct dma_buf *buf)
drm_gem_dmabuf_release(buf);
}
+static int tegra_gem_prime_begin_cpu_access(struct dma_buf *buf,
+ enum dma_data_direction direction)
+{
+ struct drm_gem_object *gem = buf->priv;
+ struct tegra_bo *bo = to_tegra_bo(gem);
+ struct drm_device *drm = gem->dev;
+
+ if (bo->pages)
+ dma_sync_sg_for_cpu(drm->dev, bo->sgt->sgl, bo->sgt->nents,
+ DMA_FROM_DEVICE);
+
+ return 0;
+}
+
+static int tegra_gem_prime_end_cpu_access(struct dma_buf *buf,
+ enum dma_data_direction direction)
+{
+ struct drm_gem_object *gem = buf->priv;
+ struct tegra_bo *bo = to_tegra_bo(gem);
+ struct drm_device *drm = gem->dev;
+
+ if (bo->pages)
+ dma_sync_sg_for_device(drm->dev, bo->sgt->sgl, bo->sgt->nents,
+ DMA_TO_DEVICE);
+
+ return 0;
+}
+
static void *tegra_gem_prime_kmap_atomic(struct dma_buf *buf,
unsigned long page)
{
@@ -618,6 +646,8 @@ static const struct dma_buf_ops tegra_gem_prime_dmabuf_ops = {
.map_dma_buf = tegra_gem_prime_map_dma_buf,
.unmap_dma_buf = tegra_gem_prime_unmap_dma_buf,
.release = tegra_gem_prime_release,
+ .begin_cpu_access = tegra_gem_prime_begin_cpu_access,
+ .end_cpu_access = tegra_gem_prime_end_cpu_access,
.map_atomic = tegra_gem_prime_kmap_atomic,
.unmap_atomic = tegra_gem_prime_kunmap_atomic,
.map = tegra_gem_prime_kmap,