gpu: nvgpu: Add support for CDE scatter buffers

Add support for CDE scatter buffers. When the bus addresses for
surfaces are not contiguous as seen by the GPU (e.g., when SMMU is
bypassed), CDE swizzling needs additional per-page information. This
information is populated in a scatter buffer when required.

Bug 1604102

Change-Id: I3384e2cfb5d5f628ed0f21375bdac8e36b77ae4f
Signed-off-by: Jussi Rasanen <jrasanen@nvidia.com>
Reviewed-on: http://git-master/r/789436
Reviewed-on: http://git-master/r/791243
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>
Tested-by: Terje Bergstrom <tbergstrom@nvidia.com>

1 files changed, 3 insertions, 1 deletions

diff --git a/include/uapi/linux/nvgpu.h b/include/uapi/linux/nvgpu.h
index c4edd305..138d7971 100644
--- a/include/uapi/linux/nvgpu.h
+++ b/include/uapi/linux/nvgpu.h
@@ -223,7 +223,9 @@ struct nvgpu_gpu_prepare_compressible_read_args {
                 __s32 fd;
         } fence;                        /* in/out */
         __u32 zbc_color;                /* out */
-        __u32 reserved[5];              /* must be zero */
+        __u32 reserved;         /* must be zero */
+        __u64 scatterbuffer_offset;     /* in, within handle */
+        __u32 reserved2[2];             /* must be zero */
 };
 
 struct nvgpu_gpu_mark_compressible_write_args {