gpu: nvgpu: Add helpers for backing store access

This patch adds mm helpers to access compression backing store
from in-kernel shader.

Bug 1409151

Change-Id: Icb4f6dc0b5a35fdb97bc4221ab3657866f775fae
Signed-off-by: Arto Merilainen <amerilainen@nvidia.com>
Reviewed-on: http://git-master/r/440263
Reviewed-by: Automatic_Commit_Validation_User
Reviewed-by: Lauri Peltonen <lpeltonen@nvidia.com>
GVS: Gerrit_Virtual_Submit

1 files changed, 8 insertions, 0 deletions

diff --git a/drivers/gpu/nvgpu/gk20a/mm_gk20a.h b/drivers/gpu/nvgpu/gk20a/mm_gk20a.h
index b0f3536e..30f9e50b 100644
--- a/drivers/gpu/nvgpu/gk20a/mm_gk20a.h
+++ b/drivers/gpu/nvgpu/gk20a/mm_gk20a.h
@@ -198,6 +198,11 @@ enum gmmu_pgsz_gk20a {
         gmmu_nr_page_sizes   = 2
 };
 
+struct gk20a_comptags {
+        u32 offset;
+        u32 lines;
+};
+
 
 struct page_directory_gk20a {
         /* backing for */
@@ -473,6 +478,9 @@ int gk20a_vm_map_buffer(struct gk20a_as_share *as_share,
                         u64 buffer_offset,
                         u64 mapping_size);
 int gk20a_vm_unmap_buffer(struct gk20a_as_share *, u64 offset);
+void gk20a_get_comptags(struct device *dev, struct dma_buf *dmabuf,
+                        struct gk20a_comptags *comptags);
+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);