drm/radeon/dpm: add infrastructure to support debugfs info

This lays the frameworks to report realtime power level
feedback.
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/radeon/radeon.h

@@ -1667,6 +1667,7 @@ struct radeon_asic {
 		u32 (*get_sclk)(struct radeon_device *rdev, bool low);
 		u32 (*get_mclk)(struct radeon_device *rdev, bool low);
 		void (*print_power_state)(struct radeon_device *rdev, struct radeon_ps *ps);
+		void (*debugfs_print_current_performance_level)(struct radeon_device *rdev, struct seq_file *m);
 	} dpm;
 	/* pageflipping */
 	struct {
@@ -2433,6 +2434,7 @@ void radeon_ring_write(struct radeon_ring *ring, uint32_t v);
 #define radeon_dpm_get_sclk(rdev, l) rdev->asic->dpm.get_sclk((rdev), (l))
 #define radeon_dpm_get_mclk(rdev, l) rdev->asic->dpm.get_mclk((rdev), (l))
 #define radeon_dpm_print_power_state(rdev, ps) rdev->asic->dpm.print_power_state((rdev), (ps))
+#define radeon_dpm_debugfs_print_current_performance_level(rdev, m) rdev->asic->dpm.debugfs_print_current_performance_level((rdev), (m))
 
 /* Common functions */
 /* AGP */

drivers/gpu/drm/radeon/radeon_pm.c

@@ -1062,6 +1062,11 @@ static int radeon_pm_init_dpm(struct radeon_device *rdev)
 		ret = device_create_file(rdev->dev, &dev_attr_power_method);
 		if (ret)
 			DRM_ERROR("failed to create device file for power method\n");
+
+		if (radeon_debugfs_pm_init(rdev)) {
+			DRM_ERROR("Failed to register debugfs file for dpm!\n");
+		}
+
 		DRM_INFO("radeon: dpm initialized\n");
 	}
 
@@ -1389,6 +1394,14 @@ static int radeon_debugfs_pm_info(struct seq_file *m, void *data)
 	struct drm_device *dev = node->minor->dev;
 	struct radeon_device *rdev = dev->dev_private;
 
+	if (rdev->pm.dpm_enabled) {
+		mutex_lock(&rdev->pm.mutex);
+		if (rdev->asic->dpm.debugfs_print_current_performance_level)
+			radeon_dpm_debugfs_print_current_performance_level(rdev, m);
+		else
+			seq_printf(m, "Unsupported\n");
+		mutex_unlock(&rdev->pm.mutex);
+	} else {
 		seq_printf(m, "default engine clock: %u0 kHz\n", rdev->pm.default_sclk);
 		/* radeon_get_engine_clock is not reliable on APUs so just print the current clock */
 		if ((rdev->family >= CHIP_PALM) && (rdev->flags & RADEON_IS_IGP))
@@ -1402,6 +1415,7 @@ static int radeon_debugfs_pm_info(struct seq_file *m, void *data)
 			seq_printf(m, "voltage: %u mV\n", rdev->pm.current_vddc);
 		if (rdev->asic->pm.get_pcie_lanes)
 			seq_printf(m, "PCIE lanes: %d\n", radeon_get_pcie_lanes(rdev));
+	}
 
 	return 0;
 }