gpu: nvgpu: Attach compression state to dma-buf

Bug 1509620

Change-Id: I694fe43ef5d1f4f329d997a3d60e006785374cc3
Signed-off-by: Lauri Peltonen <lpeltonen@nvidia.com>
Reviewed-on: http://git-master/r/439849
Reviewed-by: Automatic_Commit_Validation_User
Reviewed-by: Arto Merilainen <amerilainen@nvidia.com>
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>

1 files changed, 22 insertions, 0 deletions

diff --git a/drivers/gpu/nvgpu/gk20a/mm_gk20a.h b/drivers/gpu/nvgpu/gk20a/mm_gk20a.h
index 30f9e50b..df64d2ca 100644
--- a/drivers/gpu/nvgpu/gk20a/mm_gk20a.h
+++ b/drivers/gpu/nvgpu/gk20a/mm_gk20a.h
@@ -174,6 +174,25 @@ struct compbit_store_desc {
         u64 base_iova;
 };
 
+struct gk20a_buffer_state {
+        struct list_head list;
+
+        /* The valid compbits and the fence must be changed atomically. */
+        struct mutex lock;
+
+        /* Offset of the surface within the dma-buf whose state is
+         * described by this struct (one dma-buf can contain multiple
+         * surfaces with different states). */
+        size_t offset;
+
+        /* A bitmask of valid sets of compbits (0 = uncompressed). */
+        u32 valid_compbits;
+
+        /* This struct reflects the state of the buffer when this
+         * fence signals. */
+        struct gk20a_fence *fence;
+};
+
 struct page_table_gk20a {
         /* backing for */
         /* Either a *page or a *mem_handle */
@@ -484,6 +503,9 @@ dma_addr_t gk20a_mm_gpuva_to_iova(struct vm_gk20a *vm, u64 gpu_vaddr);
 
 int gk20a_dmabuf_alloc_drvdata(struct dma_buf *dmabuf, struct device *dev);
 
+int gk20a_dmabuf_get_state(struct dma_buf *dmabuf, struct device *dev,
+                           u64 offset, struct gk20a_buffer_state **state);
+
 int map_gmmu_pages(void *handle, struct sg_table *sgt,
                           void **va, size_t size);
 void unmap_gmmu_pages(void *handle, struct sg_table *sgt, void *va);