drm/amdgpu: introduce AMDGPU_CTX_PRIORITY_UNSET

Use _INVALID to identify bad parameters and _UNSET to represent the
lack of interest in a specific value.

Signed-off-by: Andres Rodriguez <andresx7@gmail.com>
Acked-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/amdgpu_ctx.c

@@ -230,6 +230,8 @@ static enum amd_sched_priority amdgpu_to_sched_priority(int amdgpu_priority)
 	case AMDGPU_CTX_PRIORITY_LOW_SW:
 	case AMDGPU_CTX_PRIORITY_LOW_HW:
 		return AMD_SCHED_PRIORITY_LOW;
+	case AMDGPU_CTX_PRIORITY_UNSET:
+		return AMD_SCHED_PRIORITY_UNSET;
 	default:
 		WARN(1, "Invalid context priority %d\n", amdgpu_priority);
 		return AMD_SCHED_PRIORITY_INVALID;

drivers/gpu/drm/amd/scheduler/gpu_scheduler.h

@@ -122,7 +122,8 @@ enum amd_sched_priority {
 	AMD_SCHED_PRIORITY_HIGH_HW,
 	AMD_SCHED_PRIORITY_KERNEL,
 	AMD_SCHED_PRIORITY_MAX,
-	AMD_SCHED_PRIORITY_INVALID = -1
+	AMD_SCHED_PRIORITY_INVALID = -1,
+	AMD_SCHED_PRIORITY_UNSET = -2
 };
 
 /**

include/uapi/drm/amdgpu_drm.h

@@ -169,6 +169,7 @@ union drm_amdgpu_bo_list {
 #define AMDGPU_CTX_UNKNOWN_RESET	3
 
 /* Context priority level */
+#define AMDGPU_CTX_PRIORITY_UNSET       -2048
 #define AMDGPU_CTX_PRIORITY_LOW_HW      -1023
 #define AMDGPU_CTX_PRIORITY_LOW_SW      -512
 #define AMDGPU_CTX_PRIORITY_NORMAL      0