drm/amdgpu: expose GPU sensor related information

This includes shader/memory clocks, temperature, GPU load, etc.

v2: - add sub-queries for AMDPGU_INFO_GPU_SENSOR_*
    - do not break the ABI
v3: - return -ENOENT when amdgpu_dpm == 0
    - expose more sensor queries
v4: - s/GPU_POWER/GPU_AVG_POWER/
    - improve VDDNB/VDDGFX query description
    - fix amdgpu_dpm check
v5: - agd: fix warning
v6: - agd: bump version

Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -60,9 +60,10 @@
  * - 3.8.0 - Add support raster config init in the kernel
  * - 3.9.0 - Add support for memory query info about VRAM and GTT.
  * - 3.10.0 - Add support for new fences ioctl, new gem ioctl flags
+ * - 3.11.0 - Add support for sensor query info (clocks, temp, etc).
  */
 #define KMS_DRIVER_MAJOR	3
-#define KMS_DRIVER_MINOR	10
+#define KMS_DRIVER_MINOR	11
 #define KMS_DRIVER_PATCHLEVEL	0
 
 int amdgpu_vram_limit = 0;

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

@@ -240,6 +240,7 @@ static int amdgpu_info_ioctl(struct drm_device *dev, void *data, struct drm_file
 	uint32_t ui32 = 0;
 	uint64_t ui64 = 0;
 	int i, found;
+	int ui32_size = sizeof(ui32);
 
 	if (!info->return_size || !info->return_pointer)
 		return -EINVAL;
@@ -596,6 +597,80 @@ static int amdgpu_info_ioctl(struct drm_device *dev, void *data, struct drm_file
 			return -EINVAL;
 		}
 	}
+	case AMDGPU_INFO_SENSOR: {
+		struct pp_gpu_power query = {0};
+		int query_size = sizeof(query);
+
+		if (amdgpu_dpm == 0)
+			return -ENOENT;
+
+		switch (info->sensor_info.type) {
+		case AMDGPU_INFO_SENSOR_GFX_SCLK:
+			/* get sclk in Mhz */
+			if (amdgpu_dpm_read_sensor(adev,
+						   AMDGPU_PP_SENSOR_GFX_SCLK,
+						   (void *)&ui32, &ui32_size)) {
+				return -EINVAL;
+			}
+			ui32 /= 100;
+			break;
+		case AMDGPU_INFO_SENSOR_GFX_MCLK:
+			/* get mclk in Mhz */
+			if (amdgpu_dpm_read_sensor(adev,
+						   AMDGPU_PP_SENSOR_GFX_MCLK,
+						   (void *)&ui32, &ui32_size)) {
+				return -EINVAL;
+			}
+			ui32 /= 100;
+			break;
+		case AMDGPU_INFO_SENSOR_GPU_TEMP:
+			/* get temperature in millidegrees C */
+			if (amdgpu_dpm_read_sensor(adev,
+						   AMDGPU_PP_SENSOR_GPU_TEMP,
+						   (void *)&ui32, &ui32_size)) {
+				return -EINVAL;
+			}
+			break;
+		case AMDGPU_INFO_SENSOR_GPU_LOAD:
+			/* get GPU load */
+			if (amdgpu_dpm_read_sensor(adev,
+						   AMDGPU_PP_SENSOR_GPU_LOAD,
+						   (void *)&ui32, &ui32_size)) {
+				return -EINVAL;
+			}
+			break;
+		case AMDGPU_INFO_SENSOR_GPU_AVG_POWER:
+			/* get average GPU power */
+			if (amdgpu_dpm_read_sensor(adev,
+						   AMDGPU_PP_SENSOR_GPU_POWER,
+						   (void *)&query, &query_size)) {
+				return -EINVAL;
+			}
+			ui32 = query.average_gpu_power >> 8;
+			break;
+		case AMDGPU_INFO_SENSOR_VDDNB:
+			/* get VDDNB in millivolts */
+			if (amdgpu_dpm_read_sensor(adev,
+						   AMDGPU_PP_SENSOR_VDDNB,
+						   (void *)&ui32, &ui32_size)) {
+				return -EINVAL;
+			}
+			break;
+		case AMDGPU_INFO_SENSOR_VDDGFX:
+			/* get VDDGFX in millivolts */
+			if (amdgpu_dpm_read_sensor(adev,
+						   AMDGPU_PP_SENSOR_VDDGFX,
+						   (void *)&ui32, &ui32_size)) {
+				return -EINVAL;
+			}
+			break;
+		default:
+			DRM_DEBUG_KMS("Invalid request %d\n",
+				      info->sensor_info.type);
+			return -EINVAL;
+		}
+		return copy_to_user(out, &ui32, min(size, 4u)) ? -EFAULT : 0;
+	}
 	default:
 		DRM_DEBUG_KMS("Invalid request %d\n", info->query);
 		return -EINVAL;

include/uapi/drm/amdgpu_drm.h

@@ -532,6 +532,22 @@ struct drm_amdgpu_cs_chunk_data {
 	#define AMDGPU_INFO_VBIOS_IMAGE		0x2
 /* Query UVD handles */
 #define AMDGPU_INFO_NUM_HANDLES			0x1C
+/* Query sensor related information */
+#define AMDGPU_INFO_SENSOR			0x1D
+	/* Subquery id: Query GPU shader clock */
+	#define AMDGPU_INFO_SENSOR_GFX_SCLK		0x1
+	/* Subquery id: Query GPU memory clock */
+	#define AMDGPU_INFO_SENSOR_GFX_MCLK		0x2
+	/* Subquery id: Query GPU temperature */
+	#define AMDGPU_INFO_SENSOR_GPU_TEMP		0x3
+	/* Subquery id: Query GPU load */
+	#define AMDGPU_INFO_SENSOR_GPU_LOAD		0x4
+	/* Subquery id: Query average GPU power	*/
+	#define AMDGPU_INFO_SENSOR_GPU_AVG_POWER	0x5
+	/* Subquery id: Query northbridge voltage */
+	#define AMDGPU_INFO_SENSOR_VDDNB		0x6
+	/* Subquery id: Query graphics voltage */
+	#define AMDGPU_INFO_SENSOR_VDDGFX		0x7
 
 #define AMDGPU_INFO_MMR_SE_INDEX_SHIFT	0
 #define AMDGPU_INFO_MMR_SE_INDEX_MASK	0xff
@@ -595,6 +611,10 @@ struct drm_amdgpu_info {
 			__u32 type;
 			__u32 offset;
 		} vbios_info;
+
+		struct {
+			__u32 type;
+		} sensor_info;
 	};
 };