gpu: nvgpu: expose CAN_RAILGATE in characteristics

Bug 200327089

Change-Id: Id7bd2795647f1e29dabe41acb20d0994cdd07958
Signed-off-by: Konsta Holtta <kholtta@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1764267
Reviewed-by: svc-mobile-coverity <svc-mobile-coverity@nvidia.com>
GVS: Gerrit_Virtual_Submit
Reviewed-by: Deepak Nibade <dnibade@nvidia.com>
Reviewed-by: Alex Waterman <alexw@nvidia.com>
Reviewed-by: Vijayakumar Subbu <vsubbu@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

2 files changed, 4 insertions, 0 deletions

diff --git a/drivers/gpu/nvgpu/os/linux/ioctl_ctrl.c b/drivers/gpu/nvgpu/os/linux/ioctl_ctrl.c
index 73a8131d..f9ad8082 100644
--- a/drivers/gpu/nvgpu/os/linux/ioctl_ctrl.c
+++ b/drivers/gpu/nvgpu/os/linux/ioctl_ctrl.c
@@ -129,6 +129,8 @@ struct nvgpu_flags_mapping {
 };
 
 static struct nvgpu_flags_mapping flags_mapping[] = {
+        {NVGPU_GPU_FLAGS_CAN_RAILGATE,
+                NVGPU_CAN_RAILGATE},
         {NVGPU_GPU_FLAGS_HAS_SYNCPOINTS,
                 NVGPU_HAS_SYNCPOINTS},
         {NVGPU_GPU_FLAGS_SUPPORT_PARTIAL_MAPPINGS,
diff --git a/include/uapi/linux/nvgpu.h b/include/uapi/linux/nvgpu.h
index 65e8427e..b85ca7b6 100644
--- a/include/uapi/linux/nvgpu.h
+++ b/include/uapi/linux/nvgpu.h
@@ -162,6 +162,8 @@ struct nvgpu_gpu_zbc_query_table_args {
 #define NVGPU_GPU_FLAGS_SUPPORT_VPR                     (1ULL << 27)
 /* Allocating per-channel syncpoint in user space is supported */
 #define NVGPU_GPU_FLAGS_SUPPORT_USER_SYNCPOINT          (1ULL << 28)
+/* Railgating (powering the GPU off completely) is supported and enabled */
+#define NVGPU_GPU_FLAGS_CAN_RAILGATE                    (1ULL << 29)
 /* SM LRF ECC is enabled */
 #define NVGPU_GPU_FLAGS_ECC_ENABLED_SM_LRF      (1ULL << 60)
 /* SM SHM ECC is enabled */