gpu: nvgpu: use coherent aperture for coherent buffers

Use sysmem_coherent aperture if the buffer mappings are requested
to be IO coherent. Use sysmem_noncoherent aperture otherwise. This
is implemented by adding a new coherent field to the GMMU attrs
struct.

Jira GPUT19X-17
Bug 1651331
Bug 200283998

Change-Id: I5cfb71b5913d4db50ebf10331b19f5a4216456bf
Signed-off-by: Deepak Nibade <dnibade@nvidia.com>
Reviewed-on: https://git-master/r/1514438
GVS: Gerrit_Virtual_Submit
Reviewed-by: Vijayakumar Subbu <vsubbu@nvidia.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/drivers/gpu/nvgpu/include/nvgpu/gmmu.h b/drivers/gpu/nvgpu/include/nvgpu/gmmu.h
index eff87c31..47af2f75 100644
--- a/drivers/gpu/nvgpu/include/nvgpu/gmmu.h
+++ b/drivers/gpu/nvgpu/include/nvgpu/gmmu.h
@@ -149,6 +149,7 @@ struct nvgpu_gmmu_pd {
  *   rw_flag:     Flag from enum gk20a_mem_rw_flag
  *   sparse:      Set if the mapping should be sparse.
  *   priv:        Privilidged mapping.
+ *   coherent:    Set if the mapping should be IO coherent.
  *   valid:       Set if the PTE should be marked valid.
  *   aperture:    VIDMEM or SYSMEM.
  *   debug:       When set print debugging info.
@@ -166,6 +167,7 @@ struct nvgpu_gmmu_attrs {
         int                      rw_flag;
         bool                     sparse;
         bool                     priv;
+        bool                     coherent;
         bool                     valid;
         enum nvgpu_aperture      aperture;
         bool                     debug;