gpu: nvgpu: cache cde compbits buf mappings

don't unmap compbits_buf explicitly from system vm early but store it in
the dmabuf's private data, and unmap it later when all user mappings to
that buffer have been disappeared.

Bug 1546619

Change-Id: I333235a0ea74c48503608afac31f5e9f1eb4b99b
Signed-off-by: Konsta Holtta <kholtta@nvidia.com>
Reviewed-on: http://git-master/r/661949
(cherry picked from commit ed2177e25d9e5facfb38786b818330798a14b9bb)
Reviewed-on: http://git-master/r/661835
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>
Tested-by: Terje Bergstrom <tbergstrom@nvidia.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/drivers/gpu/nvgpu/gk20a/mm_gk20a.h b/drivers/gpu/nvgpu/gk20a/mm_gk20a.h
index 42c164be..8f0f736b 100644
--- a/drivers/gpu/nvgpu/gk20a/mm_gk20a.h
+++ b/drivers/gpu/nvgpu/gk20a/mm_gk20a.h
@@ -554,6 +554,9 @@ void gk20a_deinit_vm(struct vm_gk20a *vm);
 int gk20a_vm_unmap_buffer(struct vm_gk20a *vm, u64 offset);
 void gk20a_get_comptags(struct device *dev, struct dma_buf *dmabuf,
                         struct gk20a_comptags *comptags);
+u64 gk20a_vm_cde_mapped(struct vm_gk20a *vm, struct dma_buf *dmabuf);
+void gk20a_vm_mark_cde_mapped(struct vm_gk20a *vm, struct dma_buf *dmabuf,
+                u64 map_vaddr);
 dma_addr_t gk20a_mm_gpuva_to_iova_base(struct vm_gk20a *vm, u64 gpu_vaddr);
 
 int gk20a_dmabuf_alloc_drvdata(struct dma_buf *dmabuf, struct device *dev);