platform/x86/amd/pmf: Add support for Auto mode feature

This feature has 3 modes quiet, balanced, performance

The objective of this feature is to track the moving average of system
power over the time period specified and switch to the subsequent mode.

In order to do this, PMF driver will get the moving average of APU power
from PMFW and power threshold, time constants, system config parameters
from OEM inputs.

System power as read by PMF driver from PMFW is the filtered value over
the sampling window. Every sampling window, moving average of system power
is computed. At the end of the monitoring window, the moving average is
compared against the threshold for mode switch for decision making.

With AMD managing the system config limits, any mode switch within
auto-mode will result in limits of fPPT/sPPT/STAPM or STT being scaled
down.

When "auto mode" is enabled, the static slider control remains out of
the PMF driver, so the platform_profile registration would not
happen in PMF driver.

The transition to auto-mode only happens when the APMF fn5 is enabled
in BIOS, platform_profile set to "balanced" and a AMT
(Auto Mode transition) is received.

Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Shyam Sundar S K <Shyam-sundar.S-k@amd.com>
Link: https://lore.kernel.org/r/20220802151149.2123699-9-Shyam-sundar.S-k@amd.com
Signed-off-by: Hans de Goede <hdegoede@redhat.com>

1 files changed, 263 insertions, 0 deletions

diff --git a/drivers/platform/x86/amd/pmf/auto-mode.c b/drivers/platform/x86/amd/pmf/auto-mode.c
new file mode 100644
index 000000000000..ab0628b76f2f
--- /dev/null
+++ b/drivers/platform/x86/amd/pmf/auto-mode.c
@@ -0,0 +1,263 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * AMD Platform Management Framework Driver
+ *
+ * Copyright (c) 2022, Advanced Micro Devices, Inc.
+ * All Rights Reserved.
+ *
+ * Author: Shyam Sundar S K <Shyam-sundar.S-k@amd.com>
+ */
+
+#include <linux/acpi.h>
+#include <linux/workqueue.h>
+#include "pmf.h"
+
+static struct auto_mode_mode_config config_store;
+static const char *state_as_str(unsigned int state);
+
+static void amd_pmf_set_automode(struct amd_pmf_dev *dev, int idx,
+				 struct auto_mode_mode_config *table)
+{
+	struct power_table_control *pwr_ctrl = &config_store.mode_set[idx].power_control;
+
+	amd_pmf_send_cmd(dev, SET_SPL, false, pwr_ctrl->spl, NULL);
+	amd_pmf_send_cmd(dev, SET_FPPT, false, pwr_ctrl->fppt, NULL);
+	amd_pmf_send_cmd(dev, SET_SPPT, false, pwr_ctrl->sppt, NULL);
+	amd_pmf_send_cmd(dev, SET_SPPT_APU_ONLY, false, pwr_ctrl->sppt_apu_only, NULL);
+	amd_pmf_send_cmd(dev, SET_STT_MIN_LIMIT, false, pwr_ctrl->stt_min, NULL);
+	amd_pmf_send_cmd(dev, SET_STT_LIMIT_APU, false,
+			 pwr_ctrl->stt_skin_temp[STT_TEMP_APU], NULL);
+	amd_pmf_send_cmd(dev, SET_STT_LIMIT_HS2, false,
+			 pwr_ctrl->stt_skin_temp[STT_TEMP_HS2], NULL);
+
+	if (is_apmf_func_supported(dev, APMF_FUNC_SET_FAN_IDX))
+		apmf_update_fan_idx(dev, config_store.mode_set[idx].fan_control.manual,
+				    config_store.mode_set[idx].fan_control.fan_id);
+}
+
+static int amd_pmf_get_moving_avg(struct amd_pmf_dev *pdev, int socket_power)
+{
+	int i, total = 0;
+
+	if (pdev->socket_power_history_idx == -1) {
+		for (i = 0; i < AVG_SAMPLE_SIZE; i++)
+			pdev->socket_power_history[i] = socket_power;
+	}
+
+	pdev->socket_power_history_idx = (pdev->socket_power_history_idx + 1) % AVG_SAMPLE_SIZE;
+	pdev->socket_power_history[pdev->socket_power_history_idx] = socket_power;
+
+	for (i = 0; i < AVG_SAMPLE_SIZE; i++)
+		total += pdev->socket_power_history[i];
+
+	return total / AVG_SAMPLE_SIZE;
+}
+
+void amd_pmf_trans_automode(struct amd_pmf_dev *dev, int socket_power, ktime_t time_elapsed_ms)
+{
+	int avg_power = 0;
+	bool update = false;
+	int i, j;
+
+	/* Get the average moving average computed by auto mode algorithm */
+	avg_power = amd_pmf_get_moving_avg(dev, socket_power);
+
+	for (i = 0; i < AUTO_TRANSITION_MAX; i++) {
+		if ((config_store.transition[i].shifting_up && avg_power >=
+		     config_store.transition[i].power_threshold) ||
+		    (!config_store.transition[i].shifting_up && avg_power <=
+		     config_store.transition[i].power_threshold)) {
+			if (config_store.transition[i].timer <
+			    config_store.transition[i].time_constant)
+				config_store.transition[i].timer += time_elapsed_ms;
+		} else {
+			config_store.transition[i].timer = 0;
+		}
+
+		if (config_store.transition[i].timer >=
+		    config_store.transition[i].time_constant &&
+		    !config_store.transition[i].applied) {
+			config_store.transition[i].applied = true;
+			update = true;
+		} else if (config_store.transition[i].timer <=
+			   config_store.transition[i].time_constant &&
+			   config_store.transition[i].applied) {
+			config_store.transition[i].applied = false;
+			update = true;
+		}
+	}
+
+	dev_dbg(dev->dev, "[AUTO_MODE] avg power: %u mW mode: %s\n", avg_power,
+		state_as_str(config_store.current_mode));
+
+	if (update) {
+		for (j = 0; j < AUTO_TRANSITION_MAX; j++) {
+			/* Apply the mode with highest priority indentified */
+			if (config_store.transition[j].applied) {
+				if (config_store.current_mode !=
+				    config_store.transition[j].target_mode) {
+					config_store.current_mode =
+							config_store.transition[j].target_mode;
+					dev_dbg(dev->dev, "[AUTO_MODE] moving to mode:%s\n",
+						state_as_str(config_store.current_mode));
+					amd_pmf_set_automode(dev, config_store.current_mode, NULL);
+				}
+				break;
+			}
+		}
+	}
+}
+
+static void amd_pmf_get_power_threshold(void)
+{
+	config_store.transition[AUTO_TRANSITION_TO_QUIET].power_threshold =
+				config_store.mode_set[AUTO_BALANCE].power_floor -
+				config_store.transition[AUTO_TRANSITION_TO_QUIET].power_delta;
+
+	config_store.transition[AUTO_TRANSITION_TO_PERFORMANCE].power_threshold =
+				config_store.mode_set[AUTO_BALANCE].power_floor -
+				config_store.transition[AUTO_TRANSITION_TO_PERFORMANCE].power_delta;
+
+	config_store.transition[AUTO_TRANSITION_FROM_QUIET_TO_BALANCE].power_threshold =
+			config_store.mode_set[AUTO_QUIET].power_floor -
+			config_store.transition[AUTO_TRANSITION_FROM_QUIET_TO_BALANCE].power_delta;
+
+	config_store.transition[AUTO_TRANSITION_FROM_PERFORMANCE_TO_BALANCE].power_threshold =
+		config_store.mode_set[AUTO_PERFORMANCE].power_floor -
+		config_store.transition[AUTO_TRANSITION_FROM_PERFORMANCE_TO_BALANCE].power_delta;
+}
+
+static const char *state_as_str(unsigned int state)
+{
+	switch (state) {
+	case AUTO_QUIET:
+		return "QUIET";
+	case AUTO_BALANCE:
+		return "BALANCED";
+	case AUTO_PERFORMANCE_ON_LAP:
+		return "ON_LAP";
+	case AUTO_PERFORMANCE:
+		return "PERFORMANCE";
+	default:
+		return "Unknown Auto Mode State";
+	}
+}
+
+static void amd_pmf_load_defaults_auto_mode(struct amd_pmf_dev *dev)
+{
+	struct apmf_auto_mode output;
+	struct power_table_control *pwr_ctrl;
+	int i;
+
+	apmf_get_auto_mode_def(dev, &output);
+	/* time constant */
+	config_store.transition[AUTO_TRANSITION_TO_QUIET].time_constant =
+								output.balanced_to_quiet;
+	config_store.transition[AUTO_TRANSITION_TO_PERFORMANCE].time_constant =
+								output.balanced_to_perf;
+	config_store.transition[AUTO_TRANSITION_FROM_QUIET_TO_BALANCE].time_constant =
+								output.quiet_to_balanced;
+	config_store.transition[AUTO_TRANSITION_FROM_PERFORMANCE_TO_BALANCE].time_constant =
+								output.perf_to_balanced;
+
+	/* power floor */
+	config_store.mode_set[AUTO_QUIET].power_floor = output.pfloor_quiet;
+	config_store.mode_set[AUTO_BALANCE].power_floor = output.pfloor_balanced;
+	config_store.mode_set[AUTO_PERFORMANCE].power_floor = output.pfloor_perf;
+	config_store.mode_set[AUTO_PERFORMANCE_ON_LAP].power_floor = output.pfloor_perf;
+
+	/* Power delta for mode change */
+	config_store.transition[AUTO_TRANSITION_TO_QUIET].power_delta =
+								output.pd_balanced_to_quiet;
+	config_store.transition[AUTO_TRANSITION_TO_PERFORMANCE].power_delta =
+								output.pd_balanced_to_perf;
+	config_store.transition[AUTO_TRANSITION_FROM_QUIET_TO_BALANCE].power_delta =
+								output.pd_quiet_to_balanced;
+	config_store.transition[AUTO_TRANSITION_FROM_PERFORMANCE_TO_BALANCE].power_delta =
+								output.pd_perf_to_balanced;
+
+	/* Power threshold */
+	amd_pmf_get_power_threshold();
+
+	/* skin temperature limits */
+	pwr_ctrl = &config_store.mode_set[AUTO_QUIET].power_control;
+	pwr_ctrl->spl = output.spl_quiet;
+	pwr_ctrl->sppt = output.sppt_quiet;
+	pwr_ctrl->fppt = output.fppt_quiet;
+	pwr_ctrl->sppt_apu_only = output.sppt_apu_only_quiet;
+	pwr_ctrl->stt_min = output.stt_min_limit_quiet;
+	pwr_ctrl->stt_skin_temp[STT_TEMP_APU] = output.stt_apu_quiet;
+	pwr_ctrl->stt_skin_temp[STT_TEMP_HS2] = output.stt_hs2_quiet;
+
+	pwr_ctrl = &config_store.mode_set[AUTO_BALANCE].power_control;
+	pwr_ctrl->spl = output.spl_balanced;
+	pwr_ctrl->sppt = output.sppt_balanced;
+	pwr_ctrl->fppt = output.fppt_balanced;
+	pwr_ctrl->sppt_apu_only = output.sppt_apu_only_balanced;
+	pwr_ctrl->stt_min = output.stt_min_limit_balanced;
+	pwr_ctrl->stt_skin_temp[STT_TEMP_APU] = output.stt_apu_balanced;
+	pwr_ctrl->stt_skin_temp[STT_TEMP_HS2] = output.stt_hs2_balanced;
+
+	pwr_ctrl = &config_store.mode_set[AUTO_PERFORMANCE].power_control;
+	pwr_ctrl->spl = output.spl_perf;
+	pwr_ctrl->sppt = output.sppt_perf;
+	pwr_ctrl->fppt = output.fppt_perf;
+	pwr_ctrl->sppt_apu_only = output.sppt_apu_only_perf;
+	pwr_ctrl->stt_min = output.stt_min_limit_perf;
+	pwr_ctrl->stt_skin_temp[STT_TEMP_APU] = output.stt_apu_perf;
+	pwr_ctrl->stt_skin_temp[STT_TEMP_HS2] = output.stt_hs2_perf;
+
+	pwr_ctrl = &config_store.mode_set[AUTO_PERFORMANCE_ON_LAP].power_control;
+	pwr_ctrl->spl = output.spl_perf_on_lap;
+	pwr_ctrl->sppt = output.sppt_perf_on_lap;
+	pwr_ctrl->fppt = output.fppt_perf_on_lap;
+	pwr_ctrl->sppt_apu_only = output.sppt_apu_only_perf_on_lap;
+	pwr_ctrl->stt_min = output.stt_min_limit_perf_on_lap;
+	pwr_ctrl->stt_skin_temp[STT_TEMP_APU] = output.stt_apu_perf_on_lap;
+	pwr_ctrl->stt_skin_temp[STT_TEMP_HS2] = output.stt_hs2_perf_on_lap;
+
+	/* Fan ID */
+	config_store.mode_set[AUTO_QUIET].fan_control.fan_id = output.fan_id_quiet;
+	config_store.mode_set[AUTO_BALANCE].fan_control.fan_id = output.fan_id_balanced;
+	config_store.mode_set[AUTO_PERFORMANCE].fan_control.fan_id = output.fan_id_perf;
+	config_store.mode_set[AUTO_PERFORMANCE_ON_LAP].fan_control.fan_id =
+									output.fan_id_perf;
+
+	config_store.transition[AUTO_TRANSITION_TO_QUIET].target_mode = AUTO_QUIET;
+	config_store.transition[AUTO_TRANSITION_TO_PERFORMANCE].target_mode =
+								AUTO_PERFORMANCE;
+	config_store.transition[AUTO_TRANSITION_FROM_QUIET_TO_BALANCE].target_mode =
+									AUTO_BALANCE;
+	config_store.transition[AUTO_TRANSITION_FROM_PERFORMANCE_TO_BALANCE].target_mode =
+									AUTO_BALANCE;
+
+	config_store.transition[AUTO_TRANSITION_TO_QUIET].shifting_up = false;
+	config_store.transition[AUTO_TRANSITION_TO_PERFORMANCE].shifting_up = true;
+	config_store.transition[AUTO_TRANSITION_FROM_QUIET_TO_BALANCE].shifting_up = true;
+	config_store.transition[AUTO_TRANSITION_FROM_PERFORMANCE_TO_BALANCE].shifting_up =
+										false;
+
+	for (i = 0 ; i < AUTO_MODE_MAX ; i++) {
+		if (config_store.mode_set[i].fan_control.fan_id == FAN_INDEX_AUTO)
+			config_store.mode_set[i].fan_control.manual = false;
+		else
+			config_store.mode_set[i].fan_control.manual = true;
+	}
+
+	/* set to initial default values */
+	config_store.current_mode = AUTO_BALANCE;
+	dev->socket_power_history_idx = -1;
+}
+
+void amd_pmf_deinit_auto_mode(struct amd_pmf_dev *dev)
+{
+	cancel_delayed_work_sync(&dev->work_buffer);
+}
+
+void amd_pmf_init_auto_mode(struct amd_pmf_dev *dev)
+{
+	amd_pmf_load_defaults_auto_mode(dev);
+	/* update the thermal limits for Automode */
+	amd_pmf_set_automode(dev, config_store.current_mode, NULL);
+	amd_pmf_init_metrics_table(dev);
+}