platform/x86/amd/pmf: Add support SPS PMF feature

SPS (a.k.a. Static Power Slider) gives a feel of Windows performance
power slider for the Linux users, where the user selects a certain
mode (like "balanced", "low-power" or "performance") and the thermals
associated with each selected mode gets applied from the silicon
side via the mailboxes defined through PMFW.

PMF driver hooks to platform_profile by reading the PMF ACPI fn9 to
see if the support is being advertised by ACPI interface.

If supported, the PMF driver reacts to platform_profile selection choices
made by the user and adjust the system thermal behavior.

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/20220802151149.2123699-4-Shyam-sundar.S-k@amd.com
Signed-off-by: Hans de Goede <hdegoede@redhat.com>

drivers/platform/x86/amd/pmf/Makefile

@@ -5,4 +5,4 @@
 #
 
 obj-$(CONFIG_AMD_PMF) += amd-pmf.o
-amd-pmf-objs := core.o acpi.o
+amd-pmf-objs := core.o acpi.o sps.o

drivers/platform/x86/amd/pmf/acpi.c

@@ -93,6 +93,16 @@ int is_apmf_func_supported(struct amd_pmf_dev *pdev, unsigned long index)
 	return !!(pdev->supported_func & BIT(index - 1));
 }
 
+int apmf_get_static_slider_granular(struct amd_pmf_dev *pdev,
+				    struct apmf_static_slider_granular_output *data)
+{
+	if (!is_apmf_func_supported(pdev, APMF_FUNC_STATIC_SLIDER_GRANULAR))
+		return -EINVAL;
+
+	return apmf_if_call_store_buffer(pdev, APMF_FUNC_STATIC_SLIDER_GRANULAR,
+									 data, sizeof(*data));
+}
+
 static int apmf_if_verify_interface(struct amd_pmf_dev *pdev)
 {
 	struct apmf_verify_interface output;

drivers/platform/x86/amd/pmf/core.c

@@ -12,6 +12,7 @@
 #include <linux/module.h>
 #include <linux/pci.h>
 #include <linux/platform_device.h>
+#include <linux/power_supply.h>
 #include "pmf.h"
 
 /* PMF-SMU communication registers */
@@ -45,6 +46,14 @@
 #define DELAY_MIN_US	2000
 #define DELAY_MAX_US	3000
 
+int amd_pmf_get_power_source(void)
+{
+	if (power_supply_is_system_supplied() > 0)
+		return POWER_SOURCE_AC;
+	else
+		return POWER_SOURCE_DC;
+}
+
 static inline u32 amd_pmf_reg_read(struct amd_pmf_dev *dev, int reg_offset)
 {
 	return ioread32(dev->regbase + reg_offset);
@@ -138,6 +147,21 @@ static const struct pci_device_id pmf_pci_ids[] = {
 	{ }
 };
 
+static void amd_pmf_init_features(struct amd_pmf_dev *dev)
+{
+	/* Enable Static Slider */
+	if (is_apmf_func_supported(dev, APMF_FUNC_STATIC_SLIDER_GRANULAR)) {
+		amd_pmf_init_sps(dev);
+		dev_dbg(dev->dev, "SPS enabled and Platform Profiles registered\n");
+	}
+}
+
+static void amd_pmf_deinit_features(struct amd_pmf_dev *dev)
+{
+	if (is_apmf_func_supported(dev, APMF_FUNC_STATIC_SLIDER_GRANULAR))
+		amd_pmf_deinit_sps(dev);
+}
+
 static const struct acpi_device_id amd_pmf_acpi_ids[] = {
 	{"AMDI0102", 0},
 	{ }
@@ -206,6 +230,7 @@ static int amd_pmf_probe(struct platform_device *pdev)
 
 	apmf_acpi_init(dev);
 	platform_set_drvdata(pdev, dev);
+	amd_pmf_init_features(dev);
 
 	mutex_init(&dev->lock);
 	dev_info(dev->dev, "registered PMF device successfully\n");
@@ -218,6 +243,7 @@ static int amd_pmf_remove(struct platform_device *pdev)
 	struct amd_pmf_dev *dev = platform_get_drvdata(pdev);
 
 	mutex_destroy(&dev->lock);
+	amd_pmf_deinit_features(dev);
 	kfree(dev->buf);
 	return 0;
 }

drivers/platform/x86/amd/pmf/pmf.h

@@ -12,10 +12,12 @@
 #define PMF_H
 
 #include <linux/acpi.h>
+#include <linux/platform_profile.h>
 
 /* APMF Functions */
 #define APMF_FUNC_VERIFY_INTERFACE			0
 #define APMF_FUNC_GET_SYS_PARAMS			1
+#define APMF_FUNC_STATIC_SLIDER_GRANULAR       9
 
 /* Message Definitions */
 #define SET_SPL				0x03 /* SPL: Sustained Power Limit */
@@ -36,6 +38,8 @@
 #define GET_STT_LIMIT_APU	0x20
 #define GET_STT_LIMIT_HS2	0x21
 
+#define ARG_NONE 0
+
 /* AMD PMF BIOS interfaces */
 struct apmf_verify_interface {
 	u16 size;
@@ -51,6 +55,30 @@ struct apmf_system_params {
 	u8 command_code;
 } __packed;
 
+enum amd_stt_skin_temp {
+	STT_TEMP_APU,
+	STT_TEMP_HS2,
+	STT_TEMP_COUNT,
+};
+
+enum amd_slider_op {
+	SLIDER_OP_GET,
+	SLIDER_OP_SET,
+};
+
+enum power_source {
+	POWER_SOURCE_AC,
+	POWER_SOURCE_DC,
+	POWER_SOURCE_MAX,
+};
+
+enum power_modes {
+	POWER_MODE_PERFORMANCE,
+	POWER_MODE_BALANCED_POWER,
+	POWER_MODE_POWER_SAVER,
+	POWER_MODE_MAX,
+};
+
 struct amd_pmf_dev {
 	void __iomem *regbase;
 	void __iomem *smu_virt_addr;
@@ -60,10 +88,45 @@ struct amd_pmf_dev {
 	struct device *dev;
 	struct mutex lock; /* protects the PMF interface */
 	u32 supported_func;
+	enum platform_profile_option current_profile;
+	struct platform_profile_handler pprof;
+};
+
+struct apmf_sps_prop_granular {
+	u32 fppt;
+	u32 sppt;
+	u32 sppt_apu_only;
+	u32 spl;
+	u32 stt_min;
+	u8 stt_skin_temp[STT_TEMP_COUNT];
+	u32 fan_id;
+} __packed;
+
+/* Static Slider */
+struct apmf_static_slider_granular_output {
+	u16 size;
+	struct apmf_sps_prop_granular prop[POWER_SOURCE_MAX * POWER_MODE_MAX];
+} __packed;
+
+struct amd_pmf_static_slider_granular {
+	u16 size;
+	struct apmf_sps_prop_granular prop[POWER_SOURCE_MAX][POWER_MODE_MAX];
 };
 
 /* Core Layer */
 int apmf_acpi_init(struct amd_pmf_dev *pmf_dev);
+int is_apmf_func_supported(struct amd_pmf_dev *pdev, unsigned long index);
 int amd_pmf_send_cmd(struct amd_pmf_dev *dev, u8 message, bool get, u32 arg, u32 *data);
+int amd_pmf_get_power_source(void);
+
+/* SPS Layer */
+u8 amd_pmf_get_pprof_modes(struct amd_pmf_dev *pmf);
+void amd_pmf_update_slider(struct amd_pmf_dev *dev, bool op, int idx,
+			   struct amd_pmf_static_slider_granular *table);
+int amd_pmf_init_sps(struct amd_pmf_dev *dev);
+void amd_pmf_deinit_sps(struct amd_pmf_dev *dev);
+int apmf_get_static_slider_granular(struct amd_pmf_dev *pdev,
+				    struct apmf_static_slider_granular_output *output);
+
 
 #endif /* PMF_H */

drivers/platform/x86/amd/pmf/sps.c

@@ -0,0 +1,143 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * AMD Platform Management Framework (PMF) Driver
+ *
+ * Copyright (c) 2022, Advanced Micro Devices, Inc.
+ * All Rights Reserved.
+ *
+ * Author: Shyam Sundar S K <Shyam-sundar.S-k@amd.com>
+ */
+
+#include "pmf.h"
+
+static struct amd_pmf_static_slider_granular config_store;
+
+static void amd_pmf_load_defaults_sps(struct amd_pmf_dev *dev)
+{
+	struct apmf_static_slider_granular_output output;
+	int i, j, idx = 0;
+
+	memset(&config_store, 0, sizeof(config_store));
+	apmf_get_static_slider_granular(dev, &output);
+
+	for (i = 0; i < POWER_SOURCE_MAX; i++) {
+		for (j = 0; j < POWER_MODE_MAX; j++) {
+			config_store.prop[i][j].spl = output.prop[idx].spl;
+			config_store.prop[i][j].sppt = output.prop[idx].sppt;
+			config_store.prop[i][j].sppt_apu_only =
+						output.prop[idx].sppt_apu_only;
+			config_store.prop[i][j].fppt = output.prop[idx].fppt;
+			config_store.prop[i][j].stt_min = output.prop[idx].stt_min;
+			config_store.prop[i][j].stt_skin_temp[STT_TEMP_APU] =
+					output.prop[idx].stt_skin_temp[STT_TEMP_APU];
+			config_store.prop[i][j].stt_skin_temp[STT_TEMP_HS2] =
+					output.prop[idx].stt_skin_temp[STT_TEMP_HS2];
+			config_store.prop[i][j].fan_id = output.prop[idx].fan_id;
+			idx++;
+		}
+	}
+}
+
+void amd_pmf_update_slider(struct amd_pmf_dev *dev, bool op, int idx,
+			   struct amd_pmf_static_slider_granular *table)
+{
+	int src = amd_pmf_get_power_source();
+
+	if (op == SLIDER_OP_SET) {
+		amd_pmf_send_cmd(dev, SET_SPL, false, config_store.prop[src][idx].spl, NULL);
+		amd_pmf_send_cmd(dev, SET_FPPT, false, config_store.prop[src][idx].fppt, NULL);
+		amd_pmf_send_cmd(dev, SET_SPPT, false, config_store.prop[src][idx].sppt, NULL);
+		amd_pmf_send_cmd(dev, SET_SPPT_APU_ONLY, false,
+				 config_store.prop[src][idx].sppt_apu_only, NULL);
+		amd_pmf_send_cmd(dev, SET_STT_MIN_LIMIT, false,
+				 config_store.prop[src][idx].stt_min, NULL);
+		amd_pmf_send_cmd(dev, SET_STT_LIMIT_APU, false,
+				 config_store.prop[src][idx].stt_skin_temp[STT_TEMP_APU], NULL);
+		amd_pmf_send_cmd(dev, SET_STT_LIMIT_HS2, false,
+				 config_store.prop[src][idx].stt_skin_temp[STT_TEMP_HS2], NULL);
+	} else if (op == SLIDER_OP_GET) {
+		amd_pmf_send_cmd(dev, GET_SPL, true, ARG_NONE, &table->prop[src][idx].spl);
+		amd_pmf_send_cmd(dev, GET_FPPT, true, ARG_NONE, &table->prop[src][idx].fppt);
+		amd_pmf_send_cmd(dev, GET_SPPT, true, ARG_NONE, &table->prop[src][idx].sppt);
+		amd_pmf_send_cmd(dev, GET_SPPT_APU_ONLY, true, ARG_NONE,
+				 &table->prop[src][idx].sppt_apu_only);
+		amd_pmf_send_cmd(dev, GET_STT_MIN_LIMIT, true, ARG_NONE,
+				 &table->prop[src][idx].stt_min);
+		amd_pmf_send_cmd(dev, GET_STT_LIMIT_APU, true, ARG_NONE,
+				 (u32 *)&table->prop[src][idx].stt_skin_temp[STT_TEMP_APU]);
+		amd_pmf_send_cmd(dev, GET_STT_LIMIT_HS2, true, ARG_NONE,
+				 (u32 *)&table->prop[src][idx].stt_skin_temp[STT_TEMP_HS2]);
+	}
+}
+
+static int amd_pmf_profile_get(struct platform_profile_handler *pprof,
+			       enum platform_profile_option *profile)
+{
+	struct amd_pmf_dev *pmf = container_of(pprof, struct amd_pmf_dev, pprof);
+
+	*profile = pmf->current_profile;
+	return 0;
+}
+
+u8 amd_pmf_get_pprof_modes(struct amd_pmf_dev *pmf)
+{
+	u8 mode;
+
+	switch (pmf->current_profile) {
+	case PLATFORM_PROFILE_PERFORMANCE:
+		mode = POWER_MODE_PERFORMANCE;
+		break;
+	case PLATFORM_PROFILE_BALANCED:
+		mode = POWER_MODE_BALANCED_POWER;
+		break;
+	case PLATFORM_PROFILE_LOW_POWER:
+		mode = POWER_MODE_POWER_SAVER;
+		break;
+	default:
+		dev_err(pmf->dev, "Unknown Platform Profile.\n");
+		break;
+	}
+
+	return mode;
+}
+
+static int amd_pmf_profile_set(struct platform_profile_handler *pprof,
+			       enum platform_profile_option profile)
+{
+	struct amd_pmf_dev *pmf = container_of(pprof, struct amd_pmf_dev, pprof);
+	u8 mode;
+
+	pmf->current_profile = profile;
+	mode = amd_pmf_get_pprof_modes(pmf);
+	amd_pmf_update_slider(pmf, SLIDER_OP_SET, mode, NULL);
+	return 0;
+}
+
+int amd_pmf_init_sps(struct amd_pmf_dev *dev)
+{
+	int err;
+
+	dev->current_profile = PLATFORM_PROFILE_BALANCED;
+	amd_pmf_load_defaults_sps(dev);
+
+	dev->pprof.profile_get = amd_pmf_profile_get;
+	dev->pprof.profile_set = amd_pmf_profile_set;
+
+	/* Setup supported modes */
+	set_bit(PLATFORM_PROFILE_LOW_POWER, dev->pprof.choices);
+	set_bit(PLATFORM_PROFILE_BALANCED, dev->pprof.choices);
+	set_bit(PLATFORM_PROFILE_PERFORMANCE, dev->pprof.choices);
+
+	/* Create platform_profile structure and register */
+	err = platform_profile_register(&dev->pprof);
+	if (err)
+		dev_err(dev->dev, "Failed to register SPS support, this is most likely an SBIOS bug: %d\n",
+			err);
+
+	return err;
+}
+
+void amd_pmf_deinit_sps(struct amd_pmf_dev *dev)
+{
+	platform_profile_remove();
+}