gpu: nvgpu: add support for L3 cache allocation of buffers

Add gv11b implementation of gpu_phys_addr() that checks the t19x
GMMU attributes struct to determine if L3 allocation should be
enabled. If L3 alloc is enabled then a special physical address
bit is set.

Add flag NVGPU_AS_MAP_BUFFER_FLAGS_L3_ALLOC to struct
nvgpu_as_map_buffer_ex_args so that User space can add a hint to
allocate buffer in L3 cache

Jira GPUT19X-10
Bug 200279508

Change-Id: I1bb9876a670b252980922aa50e3e69b802be137f
Signed-off-by: Deepak Nibade <dnibade@nvidia.com>
Reviewed-on: https://git-master/r/1512602
GVS: Gerrit_Virtual_Submit
Reviewed-by: Vijayakumar Subbu <vsubbu@nvidia.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/include/uapi/linux/nvgpu-t19x.h b/include/uapi/linux/nvgpu-t19x.h
index 96514a88..bc37bc7c 100644
--- a/include/uapi/linux/nvgpu-t19x.h
+++ b/include/uapi/linux/nvgpu-t19x.h
@@ -27,6 +27,12 @@
 #define NVGPU_GPU_ARCH_GV110 0x00000150
 #define NVGPU_GPU_IMPL_GV11B 0x0000000B
 
+/*
+ * this flag is used in struct nvgpu_as_map_buffer_ex_args
+ * to provide L3 cache allocation hint
+ */
+#define NVGPU_AS_MAP_BUFFER_FLAGS_L3_ALLOC      (1 << 7)
+
 /*  subcontexts are available */
 #define NVGPU_GPU_FLAGS_SUPPORT_TSG_SUBCONTEXTS         (1ULL << 22)