drm/radeon/dpm: add debugfs support for KB/KV

This allows you to look at the current DPM state via
debugfs.
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/radeon/cikd.h

@@ -134,6 +134,10 @@
 #       define DISP_GAP_MCHG(x)                           ((x) << 24)
 #       define DISP_GAP_MCHG_MASK                         (3 << 24)
 
+#define SMU_VOLTAGE_STATUS                                0xC0200094
+#       define SMU_VOLTAGE_CURRENT_LEVEL_MASK             (0xff << 1)
+#       define SMU_VOLTAGE_CURRENT_LEVEL_SHIFT            1
+
 #define TARGET_AND_CURRENT_PROFILE_INDEX_1                0xC02000F0
 #       define CURR_PCIE_INDEX_MASK                       (0xf << 24)
 #       define CURR_PCIE_INDEX_SHIFT                      24

drivers/gpu/drm/radeon/kv_dpm.c

@@ -26,6 +26,7 @@
 #include "cikd.h"
 #include "r600_dpm.h"
 #include "kv_dpm.h"
+#include <linux/seq_file.h>
 
 #define KV_MAX_DEEPSLEEP_DIVIDER_ID     5
 #define KV_MINIMUM_ENGINE_CLOCK         800
@@ -2481,6 +2482,28 @@ int kv_dpm_init(struct radeon_device *rdev)
 	return 0;
 }
 
+void kv_dpm_debugfs_print_current_performance_level(struct radeon_device *rdev,
+						    struct seq_file *m)
+{
+	struct kv_power_info *pi = kv_get_pi(rdev);
+	u32 current_index =
+		(RREG32_SMC(TARGET_AND_CURRENT_PROFILE_INDEX) & CURR_SCLK_INDEX_MASK) >>
+		CURR_SCLK_INDEX_SHIFT;
+	u32 sclk, tmp;
+	u16 vddc;
+
+	if (current_index >= SMU__NUM_SCLK_DPM_STATE) {
+		seq_printf(m, "invalid dpm profile %d\n", current_index);
+	} else {
+		sclk = be32_to_cpu(pi->graphics_level[current_index].SclkFrequency);
+		tmp = (RREG32_SMC(SMU_VOLTAGE_STATUS) & SMU_VOLTAGE_CURRENT_LEVEL_MASK) >>
+			SMU_VOLTAGE_CURRENT_LEVEL_SHIFT;
+		vddc = kv_convert_8bit_index_to_voltage(rdev, (u16)tmp);
+		seq_printf(m, "power level %d    sclk: %u vddc: %u\n",
+			   current_index, sclk, vddc);
+	}
+}
+
 void kv_dpm_print_power_state(struct radeon_device *rdev,
 			      struct radeon_ps *rps)
 {

drivers/gpu/drm/radeon/radeon_asic.c

@@ -2640,6 +2640,7 @@ static struct radeon_asic kv_asic = {
 		.get_sclk = &kv_dpm_get_sclk,
 		.get_mclk = &kv_dpm_get_mclk,
 		.print_power_state = &kv_dpm_print_power_state,
+		.debugfs_print_current_performance_level = &kv_dpm_debugfs_print_current_performance_level,
 	},
 	.pflip = {
 		.pre_page_flip = &evergreen_pre_page_flip,

drivers/gpu/drm/radeon/radeon_asic.h

@@ -782,5 +782,7 @@ u32 kv_dpm_get_sclk(struct radeon_device *rdev, bool low);
 u32 kv_dpm_get_mclk(struct radeon_device *rdev, bool low);
 void kv_dpm_print_power_state(struct radeon_device *rdev,
 			      struct radeon_ps *ps);
+void kv_dpm_debugfs_print_current_performance_level(struct radeon_device *rdev,
+						    struct seq_file *m);
 
 #endif