graysky2/Implement-AMD-Pstate-EPP-Driver.patch Secret

## Implement-AMD-Pstate-EPP-Driver.patch
From f88295fb23080010a99de0edfbf170163fe8cd2c Mon Sep 17 00:00:00 2001
Date: Sat, 12 Nov 2022 06:09:52 -0500
Subject: [PATCH] Implement AMD Pstate EPP Driver

Rebased into 6.0.8 from https://lore.kernel.org/lkml/20221110175847.3098728-1-Perry.Yuan@amd.com/
---
 Documentation/admin-guide/pm/amd-pstate.rst |  19 +
 arch/x86/include/asm/msr-index.h            |   7 +
 drivers/acpi/cppc_acpi.c                    | 128 ++-
 drivers/cpufreq/amd-pstate.c                | 950 +++++++++++++++++++-
 drivers/cpufreq/cpufreq.c                   |   2 +
 include/acpi/cppc_acpi.h                    |  17 +
 6 files changed, 1116 insertions(+), 7 deletions(-)

diff --git a/Documentation/admin-guide/pm/amd-pstate.rst b/Documentation/admin-guide/pm/amd-pstate.rst
index 83b58eb4ab4d..d0f0e115013b 100644
--- a/Documentation/admin-guide/pm/amd-pstate.rst
+++ b/Documentation/admin-guide/pm/amd-pstate.rst
@@ -261,6 +261,25 @@ lowest non-linear performance in `AMD CPPC Performance Capability
 <perf_cap_>`_.)
 This attribute is read-only.

+``energy_performance_available_preferences``
+
+All the supported EPP preference could be selected, List of the strings that
+can be set to the ``energy_performance_preference`` attribute
+those different profiles represent different energy vs efficiency hints provided
+to low-level firmware
+however, the ``default`` represents the epp value is set by platform firmware
+This attribute is read-only.
+
+``energy_performance_preference``
+
+The current energy performance preference can be read from this attribute.
+and user can change current preference according to energy or performance needs
+Please get all support profiles list from
+``energy_performance_available_preferences`` attribute, all the profiles are
+integer values defined between 0 to 255 when EPP feature is enabled by platform
+firmware, if EPP feature is disabled, driver will ignore the written value
+This attribute is read-write.
+
 Other performance and frequency values can be read back from
 ``/sys/devices/system/cpu/cpuX/acpi_cppc/``, see :ref:`cppc_sysfs`.

diff --git a/arch/x86/include/asm/msr-index.h b/arch/x86/include/asm/msr-index.h
index 1e086b37a307..2cefb2524c03 100644
--- a/arch/x86/include/asm/msr-index.h
+++ b/arch/x86/include/asm/msr-index.h
@@ -574,6 +574,7 @@
 #define MSR_AMD_CPPC_CAP2		0xc00102b2
 #define MSR_AMD_CPPC_REQ		0xc00102b3
 #define MSR_AMD_CPPC_STATUS		0xc00102b4
+#define MSR_AMD_CPPC_HW_CTL		0xc0010015

 #define AMD_CPPC_LOWEST_PERF(x)		(((x) >> 0) & 0xff)
 #define AMD_CPPC_LOWNONLIN_PERF(x)	(((x) >> 8) & 0xff)
@@ -584,12 +585,18 @@
 #define AMD_CPPC_MIN_PERF(x)		(((x) & 0xff) << 8)
 #define AMD_CPPC_DES_PERF(x)		(((x) & 0xff) << 16)
 #define AMD_CPPC_ENERGY_PERF_PREF(x)	(((x) & 0xff) << 24)
+#define AMD_CPPC_PRECISION_BOOST_BIT   25
+#define AMD_CPPC_PRECISION_BOOST_ENABLED       BIT_ULL(AMD_CPPC_PRECISION_BOOST_BIT)

 /* AMD Performance Counter Global Status and Control MSRs */
 #define MSR_AMD64_PERF_CNTR_GLOBAL_STATUS	0xc0000300
 #define MSR_AMD64_PERF_CNTR_GLOBAL_CTL		0xc0000301
 #define MSR_AMD64_PERF_CNTR_GLOBAL_STATUS_CLR	0xc0000302

+#define AMD_CPPC_EPP_PERFORMANCE		0x00
+#define AMD_CPPC_EPP_BALANCE_PERFORMANCE	0x80
+#define AMD_CPPC_EPP_BALANCE_POWERSAVE		0xBF
+#define AMD_CPPC_EPP_POWERSAVE			0xFF
 /* Fam 17h MSRs */
 #define MSR_F17H_IRPERF			0xc00000e9

diff --git a/drivers/acpi/cppc_acpi.c b/drivers/acpi/cppc_acpi.c
index 1e15a9f25ae9..9c28f47e1b1e 100644
--- a/drivers/acpi/cppc_acpi.c
+++ b/drivers/acpi/cppc_acpi.c
@@ -1320,6 +1320,132 @@ int cppc_get_perf_ctrs(int cpunum, struct cppc_perf_fb_ctrs *perf_fb_ctrs)
 }
 EXPORT_SYMBOL_GPL(cppc_get_perf_ctrs);

+/**
+ * cppc_get_epp_caps - Get the energy preference register value.
+ * @cpunum: CPU from which to get epp preference level.
+ * @perf_caps: Return address.
+ *
+ * Return: 0 for success, -EIO otherwise.
+ */
+int cppc_get_epp_caps(int cpunum, struct cppc_perf_caps *perf_caps)
+{
+	struct cpc_desc *cpc_desc = per_cpu(cpc_desc_ptr, cpunum);
+	struct cpc_register_resource *energy_perf_reg;
+	u64 energy_perf;
+
+	if (!cpc_desc) {
+		pr_warn("No CPC descriptor for CPU:%d\n", cpunum);
+		return -ENODEV;
+	}
+
+	energy_perf_reg = &cpc_desc->cpc_regs[ENERGY_PERF];
+
+	if (!CPC_SUPPORTED(energy_perf_reg))
+		pr_warn("energy perf reg update is unsupported!\n");
+
+	if (CPC_IN_PCC(energy_perf_reg)) {
+		int pcc_ss_id = per_cpu(cpu_pcc_subspace_idx, cpunum);
+		struct cppc_pcc_data *pcc_ss_data = NULL;
+		int ret = 0;
+
+		if (pcc_ss_id < 0)
+			return -EIO;
+
+		pcc_ss_data = pcc_data[pcc_ss_id];
+
+		down_write(&pcc_ss_data->pcc_lock);
+
+		if (send_pcc_cmd(pcc_ss_id, CMD_READ) >= 0) {
+			cpc_read(cpunum, energy_perf_reg, &energy_perf);
+			perf_caps->energy_perf = energy_perf;
+		} else {
+			ret = -EIO;
+		}
+
+		up_write(&pcc_ss_data->pcc_lock);
+
+		return ret;
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(cppc_get_epp_caps);
+
+int cppc_set_auto_epp(int cpu, bool enable)
+{
+	int pcc_ss_id = per_cpu(cpu_pcc_subspace_idx, cpu);
+	struct cpc_register_resource *auto_sel_reg;
+	struct cpc_desc *cpc_desc = per_cpu(cpc_desc_ptr, cpu);
+	struct cppc_pcc_data *pcc_ss_data = NULL;
+	int ret = -EINVAL;
+
+	if (!cpc_desc) {
+		pr_warn("No CPC descriptor for CPU:%d\n", cpu);
+		return -EINVAL;
+	}
+
+	auto_sel_reg = &cpc_desc->cpc_regs[AUTO_SEL_ENABLE];
+
+	if (CPC_IN_PCC(auto_sel_reg)) {
+		if (pcc_ss_id < 0)
+			return -EIO;
+
+		ret = cpc_write(cpu, auto_sel_reg, enable);
+		if (ret)
+			return ret;
+
+		pcc_ss_data = pcc_data[pcc_ss_id];
+
+		down_write(&pcc_ss_data->pcc_lock);
+		/* after writing CPC, transfer the ownership of PCC to platform */
+		ret = send_pcc_cmd(pcc_ss_id, CMD_WRITE);
+		up_write(&pcc_ss_data->pcc_lock);
+		return ret;
+	}
+
+	return cpc_write(cpu, auto_sel_reg, enable);
+}
+EXPORT_SYMBOL_GPL(cppc_set_auto_epp);
+
+/*
+ * Set Energy Performance Preference Register value through
+ * Performance Controls Interface
+ */
+int cppc_set_epp_perf(int cpu, struct cppc_perf_ctrls *perf_ctrls)
+{
+	int pcc_ss_id = per_cpu(cpu_pcc_subspace_idx, cpu);
+	struct cpc_register_resource *epp_set_reg;
+	struct cpc_desc *cpc_desc = per_cpu(cpc_desc_ptr, cpu);
+	struct cppc_pcc_data *pcc_ss_data = NULL;
+	int ret = -EINVAL;
+
+	if (!cpc_desc) {
+		pr_warn("No CPC descriptor for CPU:%d\n", cpu);
+		return -EINVAL;
+	}
+
+	epp_set_reg = &cpc_desc->cpc_regs[ENERGY_PERF];
+
+	if (CPC_IN_PCC(epp_set_reg)) {
+		if (pcc_ss_id < 0)
+			return -EIO;
+
+		ret = cpc_write(cpu, epp_set_reg, perf_ctrls->energy_perf);
+		if (ret)
+			return ret;
+
+		pcc_ss_data = pcc_data[pcc_ss_id];
+
+		down_write(&pcc_ss_data->pcc_lock);
+		/* after writing CPC, transfer the ownership of PCC to platform */
+		ret = send_pcc_cmd(pcc_ss_id, CMD_WRITE);
+		up_write(&pcc_ss_data->pcc_lock);
+	}
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(cppc_set_epp_perf);
+
 /**
  * cppc_set_enable - Set to enable CPPC on the processor by writing the
  * Continuous Performance Control package EnableRegister field.
@@ -1355,7 +1481,7 @@ int cppc_set_enable(int cpu, bool enable)
 		pcc_ss_data = pcc_data[pcc_ss_id];

 		down_write(&pcc_ss_data->pcc_lock);
-		/* after writing CPC, transfer the ownership of PCC to platfrom */
+		/* after writing CPC, transfer the ownership of PCC to platform */
 		ret = send_pcc_cmd(pcc_ss_id, CMD_WRITE);
 		up_write(&pcc_ss_data->pcc_lock);
 		return ret;
diff --git a/drivers/cpufreq/amd-pstate.c b/drivers/cpufreq/amd-pstate.c
index d63a28c5f95a..c43cf4855728 100644
--- a/drivers/cpufreq/amd-pstate.c
+++ b/drivers/cpufreq/amd-pstate.c
@@ -63,7 +63,13 @@ module_param(shared_mem, bool, 0444);
 MODULE_PARM_DESC(shared_mem,
 		 "enable amd-pstate on processors with shared memory solution (false = disabled (default), true = enabled)");

-static struct cpufreq_driver amd_pstate_driver;
+static bool epp_enabled = false;
+module_param(epp_enabled, bool, 0444);
+MODULE_PARM_DESC(epp_enabled,
+		"Enable energy performance preference (EPP) control");
+
+static struct cpufreq_driver *default_pstate_driver;
+static struct amd_cpudata **all_cpu_data;

 /**
  * struct  amd_aperf_mperf
@@ -75,6 +81,7 @@ struct amd_aperf_mperf {
 	u64 aperf;
 	u64 mperf;
 	u64 tsc;
+	u64 time;
 };

 /**
@@ -97,6 +104,19 @@ struct amd_aperf_mperf {
  * @prev: Last Aperf/Mperf/tsc count value read from register
  * @freq: current cpu frequency value
  * @boost_supported: check whether the Processor or SBIOS supports boost mode
+ * @epp_powersave: Last saved CPPC energy performance preference
+				when policy switched to performance
+ * @epp_policy: Last saved policy used to set energy-performance preference
+ * @epp_cached: Cached CPPC energy-performance preference value
+ * @policy: Cpufreq policy value
+ * @sched_flags: Store scheduler flags for possible cross CPU update
+ * @update_util_set: CPUFreq utility callback is set
+ * @last_update: Time stamp of the last performance state update
+ * @cppc_boost_min: Last CPPC boosted min performance state
+ * @cppc_cap1_cached: Cached value of the last CPPC Capabilities MSR
+ * @update_util: Cpufreq utility callback information
+ * @sample: the stored performance sample
+ * @suspended:	Whether or not the driver has been suspended.
  *
  * The amd_cpudata is key private data for each CPU thread in AMD P-State, and
  * represents all the attributes and goals that AMD P-State requests at runtime.
@@ -122,8 +142,201 @@ struct amd_cpudata {

 	u64 freq;
 	bool	boost_supported;
+	u64	cppc_hw_conf_cached;
+
+	/* EPP feature related attributes*/
+	s16	epp_powersave;
+	s16	epp_policy;
+	s16	epp_cached;
+	u32	policy;
+	u32	sched_flags;
+	bool	update_util_set;
+	u64	last_update;
+	u64	last_io_update;
+	u32	cppc_boost_min;
+	u64	cppc_cap1_cached;
+	struct	update_util_data update_util;
+	struct	amd_aperf_mperf sample;
+	bool suspended;
+};
+
+/**
+ * struct amd_pstate_params - global parameters for the performance control
+ * @ cppc_boost_disabled wheher the core performance boost disabled
+ */
+struct amd_pstate_params {
+	bool cppc_boost_disabled;
+};
+
+/*
+ * AMD Energy Preference Performance (EPP)
+ * The EPP is used in the CCLK DPM controller to drive
+ * the frequency that a core is going to operate during
+ * short periods of activity. EPP values will be utilized for
+ * different OS profiles (balanced, performance, power savings)
+ * display strings corresponding to EPP index in the
+ * energy_perf_strings[]
+ *	index		String
+ *-------------------------------------
+ *	0		default
+ *	1		performance
+ *	2		balance_performance
+ *	3		balance_power
+ *	4		power
+ */
+enum energy_perf_value_index {
+	EPP_INDEX_DEFAULT = 0,
+	EPP_INDEX_PERFORMANCE,
+	EPP_INDEX_BALANCE_PERFORMANCE,
+	EPP_INDEX_BALANCE_POWERSAVE,
+	EPP_INDEX_POWERSAVE,
+};
+
+static const char * const energy_perf_strings[] = {
+	[EPP_INDEX_DEFAULT] = "default",
+	[EPP_INDEX_PERFORMANCE] = "performance",
+	[EPP_INDEX_BALANCE_PERFORMANCE] = "balance_performance",
+	[EPP_INDEX_BALANCE_POWERSAVE] = "balance_power",
+	[EPP_INDEX_POWERSAVE] = "power",
+	NULL
+};
+
+static unsigned int epp_values[] = {
+	[EPP_INDEX_DEFAULT] = 0,
+	[EPP_INDEX_PERFORMANCE] = AMD_CPPC_EPP_PERFORMANCE,
+	[EPP_INDEX_BALANCE_PERFORMANCE] = AMD_CPPC_EPP_BALANCE_PERFORMANCE,
+	[EPP_INDEX_BALANCE_POWERSAVE] = AMD_CPPC_EPP_BALANCE_POWERSAVE,
+	[EPP_INDEX_POWERSAVE] = AMD_CPPC_EPP_POWERSAVE,
 };

+static struct amd_pstate_params global_params;
+
+static DEFINE_MUTEX(amd_pstate_limits_lock);
+static DEFINE_MUTEX(amd_pstate_driver_lock);
+static DEFINE_SPINLOCK(amd_pstate_cpu_lock);
+
+static bool cppc_boost __read_mostly;
+struct kobject *amd_pstate_kobj;
+
+/* the flag whether the pstate driver is exiting */
+static bool pstate_exiting;
+
+#ifdef CONFIG_ACPI_CPPC_LIB
+static s16 amd_pstate_get_epp(struct amd_cpudata *cpudata, u64 cppc_req_cached)
+{
+	s16 epp;
+	struct cppc_perf_caps perf_caps;
+	int ret;
+
+	if (boot_cpu_has(X86_FEATURE_CPPC)) {
+		if (!cppc_req_cached) {
+			epp = rdmsrl_on_cpu(cpudata->cpu, MSR_AMD_CPPC_REQ,
+					    &cppc_req_cached);
+			if (epp)
+				return epp;
+		}
+		epp = (cppc_req_cached >> 24) & 0xFF;
+	} else {
+		ret = cppc_get_epp_caps(cpudata->cpu, &perf_caps);
+		if (ret < 0) {
+			pr_debug("Could not retrieve energy perf value (%d)\n", ret);
+			return -EIO;
+		}
+		epp = (s16) perf_caps.energy_perf;
+	}
+
+	return epp;
+}
+#endif
+
+static int amd_pstate_get_energy_pref_index(struct amd_cpudata *cpudata, int *raw_epp)
+{
+	s16 epp;
+	int index = -EINVAL;
+
+	*raw_epp = 0;
+	epp = amd_pstate_get_epp(cpudata, 0);
+	if (epp < 0)
+		return epp;
+
+	switch (epp) {
+	case AMD_CPPC_EPP_PERFORMANCE:
+		index = EPP_INDEX_PERFORMANCE;
+		break;
+	case AMD_CPPC_EPP_BALANCE_PERFORMANCE:
+		index = EPP_INDEX_BALANCE_PERFORMANCE;
+		break;
+	case AMD_CPPC_EPP_BALANCE_POWERSAVE:
+		index = EPP_INDEX_BALANCE_POWERSAVE;
+		break;
+	case AMD_CPPC_EPP_POWERSAVE:
+		index = EPP_INDEX_POWERSAVE;
+		break;
+	default:
+		*raw_epp = epp;
+		index = 0;
+	}
+
+	return index;
+}
+
+#ifdef CONFIG_ACPI_CPPC_LIB
+static int amd_pstate_set_epp(struct amd_cpudata *cpudata, u32 epp)
+{
+	int ret;
+	struct cppc_perf_ctrls perf_ctrls;
+
+	if (boot_cpu_has(X86_FEATURE_CPPC)) {
+		u64 value = READ_ONCE(cpudata->cppc_req_cached);
+
+		value &= ~GENMASK_ULL(31, 24);
+		value |= (u64)epp << 24;
+		WRITE_ONCE(cpudata->cppc_req_cached, value);
+
+		ret = wrmsrl_on_cpu(cpudata->cpu, MSR_AMD_CPPC_REQ, value);
+		if (!ret)
+			cpudata->epp_cached = epp;
+	} else {
+		perf_ctrls.energy_perf = epp;
+		ret = cppc_set_epp_perf(cpudata->cpu, &perf_ctrls);
+		if (ret) {
+			pr_debug("failed to set energy perf value (%d)\n", ret);
+			return ret;
+		}
+		cpudata->epp_cached = epp;
+	}
+
+	return ret;
+}
+
+static int amd_pstate_set_energy_pref_index(struct amd_cpudata *cpudata,
+					      int pref_index, bool use_raw,
+					      u32 raw_epp)
+{
+	int epp = -EINVAL;
+	int ret;
+
+	if (!pref_index) {
+		pr_debug("EPP pref_index is invalid\n");
+		return -EINVAL;
+	}
+
+	if (use_raw)
+		epp = raw_epp;
+	else if (epp == -EINVAL)
+		epp = epp_values[pref_index];
+
+	if (epp > 0 && cpudata->policy == CPUFREQ_POLICY_PERFORMANCE) {
+		pr_debug("EPP cannot be set under performance policy\n");
+		return -EBUSY;
+	}
+
+	ret = amd_pstate_set_epp(cpudata, epp);
+
+	return ret;
+}
+#endif
+
 static inline int pstate_enable(bool enable)
 {
 	return wrmsrl_safe(MSR_AMD_CPPC_ENABLE, enable);
@@ -131,12 +344,25 @@ static inline int pstate_enable(bool enable)

 static int cppc_enable(bool enable)
 {
+	struct cppc_perf_ctrls perf_ctrls;
 	int cpu, ret = 0;

 	for_each_present_cpu(cpu) {
 		ret = cppc_set_enable(cpu, enable);
 		if (ret)
 			return ret;
+		if (epp_enabled) {
+			/* Enable autonomous mode for EPP */
+			ret = cppc_set_auto_epp(cpu, enable);
+			if (ret)
+				return ret;
+
+			/* Set desired perf as zero to allow EPP firmware control */
+			perf_ctrls.desired_perf = 0;
+			ret = cppc_set_perf(cpu, &perf_ctrls);
+			if (ret)
+				return ret;
+		}
 	}

 	return ret;
@@ -480,7 +706,7 @@ static void amd_pstate_boost_init(struct amd_cpudata *cpudata)
 		return;

 	cpudata->boost_supported = true;
-	amd_pstate_driver.boost_enabled = true;
+	default_pstate_driver->boost_enabled = true;
 }

 static int amd_pstate_cpu_init(struct cpufreq_policy *policy)
@@ -650,10 +876,108 @@ static ssize_t show_amd_pstate_highest_perf(struct cpufreq_policy *policy,
 	return sprintf(&buf[0], "%u\n", perf);
 }

+static ssize_t show_energy_performance_available_preferences(
+				struct cpufreq_policy *policy, char *buf)
+{
+	int i = 0;
+	int ret = 0;
+
+	while (energy_perf_strings[i] != NULL)
+		ret += sprintf(&buf[ret], "%s ", energy_perf_strings[i++]);
+
+	ret += sprintf(&buf[ret], "\n");
+
+	return ret;
+}
+
+static ssize_t store_energy_performance_preference(
+		struct cpufreq_policy *policy, const char *buf, size_t count)
+{
+	struct amd_cpudata *cpudata = policy->driver_data;
+	char str_preference[21];
+	bool raw = false;
+	ssize_t ret;
+	u32 epp = 0;
+
+	ret = sscanf(buf, "%20s", str_preference);
+	if (ret != 1)
+		return -EINVAL;
+
+	ret = match_string(energy_perf_strings, -1, str_preference);
+	if (ret < 0) {
+		ret = kstrtouint(buf, 10, &epp);
+		if (ret)
+			return ret;
+
+		if ((epp > 255) || (epp < 0))
+			return -EINVAL;
+
+		raw = true;
+	}
+
+	mutex_lock(&amd_pstate_limits_lock);
+	ret = amd_pstate_set_energy_pref_index(cpudata, ret, raw, epp);
+	mutex_unlock(&amd_pstate_limits_lock);
+
+	return ret ?: count;
+}
+
+static ssize_t show_energy_performance_preference(
+				struct cpufreq_policy *policy, char *buf)
+{
+	struct amd_cpudata *cpudata = policy->driver_data;
+	int preference, raw_epp;
+
+	preference = amd_pstate_get_energy_pref_index(cpudata, &raw_epp);
+	if (preference < 0)
+		return preference;
+
+	if (raw_epp)
+		return  sprintf(buf, "%d\n", raw_epp);
+	else
+		return  sprintf(buf, "%s\n", energy_perf_strings[preference]);
+}
+
+static void amd_pstate_update_policies(void)
+{
+	int cpu;
+
+	for_each_possible_cpu(cpu)
+		cpufreq_update_policy(cpu);
+}
+
+static ssize_t show_pstate_dynamic_boost(struct kobject *kobj,
+				struct kobj_attribute *attr, char *buf)
+{
+	return sprintf(buf, "%u\n", cppc_boost);
+}
+
+static ssize_t store_pstate_dynamic_boost(struct kobject *a,
+				       struct kobj_attribute *b,
+				       const char *buf, size_t count)
+{
+	unsigned int input;
+	int ret;
+
+	ret = kstrtouint(buf, 10, &input);
+	if (ret)
+		return ret;
+
+	mutex_lock(&amd_pstate_driver_lock);
+	cppc_boost = !!input;
+	amd_pstate_update_policies();
+	mutex_unlock(&amd_pstate_driver_lock);
+
+	return count;
+}
+
 cpufreq_freq_attr_ro(amd_pstate_max_freq);
 cpufreq_freq_attr_ro(amd_pstate_lowest_nonlinear_freq);

 cpufreq_freq_attr_ro(amd_pstate_highest_perf);
+cpufreq_freq_attr_rw(energy_performance_preference);
+cpufreq_freq_attr_ro(energy_performance_available_preferences);
+define_one_global_rw(pstate_dynamic_boost);

 static struct freq_attr *amd_pstate_attr[] = {
 	&amd_pstate_max_freq,
@@ -662,6 +986,552 @@ static struct freq_attr *amd_pstate_attr[] = {
 	NULL,
 };

+static struct freq_attr *amd_pstate_epp_attr[] = {
+	&amd_pstate_max_freq,
+	&amd_pstate_lowest_nonlinear_freq,
+	&amd_pstate_highest_perf,
+	&energy_performance_preference,
+	&energy_performance_available_preferences,
+	NULL,
+};
+
+static struct attribute *pstate_global_attributes[] = {
+	&pstate_dynamic_boost.attr,
+	NULL
+};
+
+static const struct attribute_group amd_pstate_global_attr_group = {
+	.attrs = pstate_global_attributes,
+};
+
+static inline void update_boost_state(void)
+{
+	u64 misc_en;
+	struct amd_cpudata *cpudata;
+
+	cpudata = all_cpu_data[0];
+	rdmsrl(MSR_AMD_CPPC_HW_CTL, misc_en);
+	global_params.cppc_boost_disabled = misc_en & AMD_CPPC_PRECISION_BOOST_ENABLED;
+}
+
+static int amd_pstate_init_cpu(unsigned int cpunum)
+{
+	struct amd_cpudata *cpudata;
+
+	cpudata = all_cpu_data[cpunum];
+	if (!cpudata) {
+		cpudata = kzalloc(sizeof(*cpudata), GFP_KERNEL);
+		if (!cpudata)
+			return -ENOMEM;
+		WRITE_ONCE(all_cpu_data[cpunum], cpudata);
+
+		cpudata->cpu = cpunum;
+	}
+	cpudata->epp_powersave = -EINVAL;
+	cpudata->epp_policy = 0;
+	pr_debug("controlling: cpu %d\n", cpunum);
+	return 0;
+}
+
+static int __amd_pstate_cpu_init(struct cpufreq_policy *policy)
+{
+	int min_freq, max_freq, nominal_freq, lowest_nonlinear_freq, ret;
+	struct amd_cpudata *cpudata;
+	struct device *dev;
+	int rc;
+	u64 value;
+
+	rc = amd_pstate_init_cpu(policy->cpu);
+	if (rc)
+		return rc;
+
+	cpudata = all_cpu_data[policy->cpu];
+
+	dev = get_cpu_device(policy->cpu);
+	if (!dev)
+		goto free_cpudata1;
+
+	rc = amd_pstate_init_perf(cpudata);
+	if (rc)
+		goto free_cpudata1;
+
+	min_freq = amd_get_min_freq(cpudata);
+	max_freq = amd_get_max_freq(cpudata);
+	nominal_freq = amd_get_nominal_freq(cpudata);
+	lowest_nonlinear_freq = amd_get_lowest_nonlinear_freq(cpudata);
+	if (min_freq < 0 || max_freq < 0 || min_freq > max_freq) {
+		dev_err(dev, "min_freq(%d) or max_freq(%d) value is incorrect\n",
+				min_freq, max_freq);
+		ret = -EINVAL;
+		goto free_cpudata1;
+	}
+
+	policy->min = min_freq;
+	policy->max = max_freq;
+
+	policy->cpuinfo.min_freq = min_freq;
+	policy->cpuinfo.max_freq = max_freq;
+	/* It will be updated by governor */
+	policy->cur = policy->cpuinfo.min_freq;
+
+	/* Initial processor data capability frequencies */
+	cpudata->max_freq = max_freq;
+	cpudata->min_freq = min_freq;
+	cpudata->nominal_freq = nominal_freq;
+	cpudata->lowest_nonlinear_freq = lowest_nonlinear_freq;
+
+	policy->driver_data = cpudata;
+
+	update_boost_state();
+	cpudata->epp_cached = amd_pstate_get_epp(cpudata, value);
+
+	policy->min = policy->cpuinfo.min_freq;
+	policy->max = policy->cpuinfo.max_freq;
+
+	if (boot_cpu_has(X86_FEATURE_CPPC))
+		policy->fast_switch_possible = true;
+
+	if (!shared_mem && boot_cpu_has(X86_FEATURE_CPPC)) {
+		ret = rdmsrl_on_cpu(cpudata->cpu, MSR_AMD_CPPC_REQ, &value);
+		if (ret)
+			return ret;
+		WRITE_ONCE(cpudata->cppc_req_cached, value);
+
+		ret = rdmsrl_on_cpu(cpudata->cpu, MSR_AMD_CPPC_CAP1, &value);
+		if (ret)
+			return ret;
+		WRITE_ONCE(cpudata->cppc_cap1_cached, value);
+	}
+	amd_pstate_boost_init(cpudata);
+
+	return 0;
+
+free_cpudata1:
+	kfree(cpudata);
+	return ret;
+}
+
+static int amd_pstate_epp_cpu_init(struct cpufreq_policy *policy)
+{
+	int ret;
+
+	ret = __amd_pstate_cpu_init(policy);
+	if (ret)
+		return ret;
+	/*
+	 * Set the policy to powersave to provide a valid fallback value in case
+	 * the default cpufreq governor is neither powersave nor performance.
+	 */
+	policy->policy = CPUFREQ_POLICY_POWERSAVE;
+
+	return 0;
+}
+
+static int amd_pstate_epp_cpu_exit(struct cpufreq_policy *policy)
+{
+	pr_debug("amd-pstate: CPU %d exiting\n", policy->cpu);
+	policy->fast_switch_possible = false;
+	return 0;
+}
+
+static void amd_pstate_update_max_freq(unsigned int cpu)
+{
+	struct cpufreq_policy *policy = cpufreq_cpu_acquire(cpu);
+
+	if (!policy)
+		return;
+
+	refresh_frequency_limits(policy);
+	cpufreq_cpu_release(policy);
+}
+
+static void amd_pstate_epp_update_limits(unsigned int cpu)
+{
+	mutex_lock(&amd_pstate_driver_lock);
+	update_boost_state();
+	if (global_params.cppc_boost_disabled) {
+		for_each_possible_cpu(cpu)
+			amd_pstate_update_max_freq(cpu);
+	} else {
+		cpufreq_update_policy(cpu);
+	}
+	mutex_unlock(&amd_pstate_driver_lock);
+}
+
+static int cppc_boost_hold_time_ns = 3 * NSEC_PER_MSEC;
+
+static inline void amd_pstate_boost_up(struct amd_cpudata *cpudata)
+{
+	u64 hwp_req = READ_ONCE(cpudata->cppc_req_cached);
+	u64 hwp_cap = READ_ONCE(cpudata->cppc_cap1_cached);
+	u32 max_limit = (hwp_req & 0xff);
+	u32 min_limit = (hwp_req & 0xff00) >> 8;
+	u32 boost_level1;
+
+	/* If max and min are equal or already at max, nothing to boost */
+	if (max_limit == min_limit)
+		return;
+
+	/* Set boost max and min to initial value */
+	if (!cpudata->cppc_boost_min)
+		cpudata->cppc_boost_min = min_limit;
+
+	boost_level1 = ((AMD_CPPC_NOMINAL_PERF(hwp_cap) + min_limit) >> 1);
+
+	if (cpudata->cppc_boost_min < boost_level1)
+		cpudata->cppc_boost_min = boost_level1;
+	else if (cpudata->cppc_boost_min < AMD_CPPC_NOMINAL_PERF(hwp_cap))
+		cpudata->cppc_boost_min = AMD_CPPC_NOMINAL_PERF(hwp_cap);
+	else if (cpudata->cppc_boost_min == AMD_CPPC_NOMINAL_PERF(hwp_cap))
+		cpudata->cppc_boost_min = max_limit;
+	else
+		return;
+
+	hwp_req &= ~AMD_CPPC_MIN_PERF(~0L);
+	hwp_req |= AMD_CPPC_MIN_PERF(cpudata->cppc_boost_min);
+	wrmsrl_safe_on_cpu(cpudata->cpu, MSR_AMD_CPPC_REQ, hwp_req);
+	cpudata->last_update = cpudata->sample.time;
+}
+
+static inline void amd_pstate_boost_down(struct amd_cpudata *cpudata)
+{
+	bool expired;
+
+	if (cpudata->cppc_boost_min) {
+		expired = time_after64(cpudata->sample.time, cpudata->last_update +
+					cppc_boost_hold_time_ns);
+
+		if (expired) {
+			wrmsrl_safe_on_cpu(cpudata->cpu, MSR_AMD_CPPC_REQ,
+						cpudata->cppc_req_cached);
+			cpudata->cppc_boost_min = 0;
+		}
+	}
+
+	cpudata->last_update = cpudata->sample.time;
+}
+
+static inline void amd_pstate_boost_update_util(struct amd_cpudata *cpudata,
+						      u64 time)
+{
+	cpudata->sample.time = time;
+	if (smp_processor_id() != cpudata->cpu)
+		return;
+
+	if (cpudata->sched_flags & SCHED_CPUFREQ_IOWAIT) {
+		bool do_io = false;
+
+		cpudata->sched_flags = 0;
+		/*
+		 * Set iowait_boost flag and update time. Since IO WAIT flag
+		 * is set all the time, we can't just conclude that there is
+		 * some IO bound activity is scheduled on this CPU with just
+		 * one occurrence. If we receive at least two in two
+		 * consecutive ticks, then we treat as boost candidate.
+		 * This is leveraged from Intel Pstate driver.
+		 */
+		if (time_before64(time, cpudata->last_io_update + 2 * TICK_NSEC))
+			do_io = true;
+
+		cpudata->last_io_update = time;
+
+		if (do_io)
+			amd_pstate_boost_up(cpudata);
+
+	} else {
+		amd_pstate_boost_down(cpudata);
+	}
+}
+
+static inline void amd_pstate_cppc_update_hook(struct update_util_data *data,
+						u64 time, unsigned int flags)
+{
+	struct amd_cpudata *cpudata = container_of(data,
+				struct amd_cpudata, update_util);
+
+	cpudata->sched_flags |= flags;
+
+	if (smp_processor_id() == cpudata->cpu)
+		amd_pstate_boost_update_util(cpudata, time);
+}
+
+static void amd_pstate_clear_update_util_hook(unsigned int cpu)
+{
+	struct amd_cpudata *cpudata = all_cpu_data[cpu];
+
+	if (!cpudata->update_util_set)
+		return;
+
+	cpufreq_remove_update_util_hook(cpu);
+	cpudata->update_util_set = false;
+	synchronize_rcu();
+}
+
+static void amd_pstate_set_update_util_hook(unsigned int cpu_num)
+{
+	struct amd_cpudata *cpudata = all_cpu_data[cpu_num];
+
+	if (!cppc_boost) {
+		if (cpudata->update_util_set)
+			amd_pstate_clear_update_util_hook(cpudata->cpu);
+		return;
+	}
+
+	if (cpudata->update_util_set)
+		return;
+
+	cpudata->sample.time = 0;
+	cpufreq_add_update_util_hook(cpu_num, &cpudata->update_util,
+						amd_pstate_cppc_update_hook);
+	cpudata->update_util_set = true;
+}
+
+static void amd_pstate_epp_init(unsigned int cpu)
+{
+	struct amd_cpudata *cpudata = all_cpu_data[cpu];
+	u32 max_perf, min_perf;
+	u64 value;
+	s16 epp;
+	int ret;
+
+	max_perf = READ_ONCE(cpudata->highest_perf);
+	min_perf = READ_ONCE(cpudata->lowest_perf);
+
+	value = READ_ONCE(cpudata->cppc_req_cached);
+
+	if (cpudata->policy == CPUFREQ_POLICY_PERFORMANCE)
+		min_perf = max_perf;
+
+	/* Initial min/max values for CPPC Performance Controls Register */
+	value &= ~AMD_CPPC_MIN_PERF(~0L);
+	value |= AMD_CPPC_MIN_PERF(min_perf);
+
+	value &= ~AMD_CPPC_MAX_PERF(~0L);
+	value |= AMD_CPPC_MAX_PERF(max_perf);
+
+	/* CPPC EPP feature require to set zero to the desire perf bit */
+	value &= ~AMD_CPPC_DES_PERF(~0L);
+	value |= AMD_CPPC_DES_PERF(0);
+
+	if (cpudata->epp_policy == cpudata->policy)
+		goto skip_epp;
+
+	cpudata->epp_policy = cpudata->policy;
+
+	if (cpudata->policy == CPUFREQ_POLICY_PERFORMANCE) {
+		epp = amd_pstate_get_epp(cpudata, value);
+		cpudata->epp_powersave = epp;
+		if (epp < 0)
+			goto skip_epp;
+		/* force the epp value to be zero for performance policy */
+		epp = 0;
+	} else {
+		if (cpudata->epp_powersave < 0)
+			goto skip_epp;
+		/* Get BIOS pre-defined epp value */
+		epp = amd_pstate_get_epp(cpudata, value);
+		if (epp)
+			goto skip_epp;
+		epp = cpudata->epp_powersave;
+	}
+	/* Set initial EPP value */
+	if (boot_cpu_has(X86_FEATURE_CPPC)) {
+		value &= ~GENMASK_ULL(31, 24);
+		value |= (u64)epp << 24;
+	}
+
+skip_epp:
+	WRITE_ONCE(cpudata->cppc_req_cached, value);
+	ret = wrmsrl_on_cpu(cpudata->cpu, MSR_AMD_CPPC_REQ, value);
+	if (!ret)
+		cpudata->epp_cached = epp;
+}
+
+static void amd_pstate_set_max_limits(struct amd_cpudata *cpudata)
+{
+	u64 hwp_cap = READ_ONCE(cpudata->cppc_cap1_cached);
+	u64 hwp_req = READ_ONCE(cpudata->cppc_req_cached);
+	u32 max_limit = (hwp_cap >> 24) & 0xff;
+
+	hwp_req &= ~AMD_CPPC_MIN_PERF(~0L);
+	hwp_req |= AMD_CPPC_MIN_PERF(max_limit);
+	wrmsrl_on_cpu(cpudata->cpu, MSR_AMD_CPPC_REQ, hwp_req);
+}
+
+static int amd_pstate_epp_set_policy(struct cpufreq_policy *policy)
+{
+	struct amd_cpudata *cpudata;
+
+	if (!policy->cpuinfo.max_freq)
+		return -ENODEV;
+
+	pr_debug("set_policy: cpuinfo.max %u policy->max %u\n",
+				policy->cpuinfo.max_freq, policy->max);
+
+	cpudata = all_cpu_data[policy->cpu];
+	cpudata->policy = policy->policy;
+
+	if (boot_cpu_has(X86_FEATURE_CPPC)) {
+		mutex_lock(&amd_pstate_limits_lock);
+
+		if (cpudata->policy == CPUFREQ_POLICY_PERFORMANCE) {
+			amd_pstate_clear_update_util_hook(policy->cpu);
+			amd_pstate_set_max_limits(cpudata);
+		} else {
+			amd_pstate_set_update_util_hook(policy->cpu);
+		}
+
+		if (boot_cpu_has(X86_FEATURE_CPPC))
+			amd_pstate_epp_init(policy->cpu);
+
+		mutex_unlock(&amd_pstate_limits_lock);
+	}
+
+	return 0;
+}
+
+static int amd_pstate_epp_suspend(struct cpufreq_policy *policy)
+{
+	struct amd_cpudata *cpudata = all_cpu_data[policy->cpu];
+	int ret;
+
+	/* avoid suspending when EPP is not enabled */
+	if (!epp_enabled)
+		return 0;
+
+	/* set this flag to avoid setting core offline*/
+	cpudata->suspended = true;
+
+	/* disable CPPC in lowlevel firmware */
+	ret = amd_pstate_enable(false);
+	if (ret)
+		pr_err("failed to suspend, return %d\n", ret);
+
+	return 0;
+}
+
+static int amd_pstate_epp_resume(struct cpufreq_policy *policy)
+{
+	struct amd_cpudata *cpudata = all_cpu_data[policy->cpu];
+
+	if (cpudata->suspended) {
+		mutex_lock(&amd_pstate_limits_lock);
+
+		/* enable amd pstate from suspend state*/
+		amd_pstate_epp_reenable(cpudata);
+
+		mutex_unlock(&amd_pstate_limits_lock);
+
+		cpudata->suspended = false;
+	}
+
+	return 0;
+}
+
+static void amd_pstate_epp_reenable(struct amd_cpudata *cpudata)
+{
+	struct cppc_perf_ctrls perf_ctrls;
+	u64 value, max_perf;
+	int ret;
+
+	ret = amd_pstate_enable(true);
+	if (ret)
+		pr_err("failed to enable amd pstate during resume, return %d\n", ret);
+
+	value = READ_ONCE(cpudata->cppc_req_cached);
+	max_perf = READ_ONCE(cpudata->highest_perf);
+
+	if (boot_cpu_has(X86_FEATURE_CPPC)) {
+		wrmsrl_on_cpu(cpudata->cpu, MSR_AMD_CPPC_REQ, value);
+	} else {
+		perf_ctrls.max_perf = max_perf;
+		perf_ctrls.energy_perf = AMD_CPPC_ENERGY_PERF_PREF(cpudata->epp_cached);
+		cppc_set_perf(cpudata->cpu, &perf_ctrls);
+	}
+}
+
+static int amd_pstate_epp_cpu_online(struct cpufreq_policy *policy)
+{
+	struct amd_cpudata *cpudata = all_cpu_data[policy->cpu];
+
+	pr_debug("AMD CPU Core %d going online\n", cpudata->cpu);
+
+	if (epp_enabled) {
+		amd_pstate_epp_reenable(cpudata);
+		cpudata->suspended = false;
+	}
+
+	return 0;
+}
+
+static void amd_pstate_epp_offline(struct cpufreq_policy *policy)
+{
+	struct amd_cpudata *cpudata = all_cpu_data[policy->cpu];
+	struct cppc_perf_ctrls perf_ctrls;
+	int min_perf;
+	u64 value;
+
+	min_perf = READ_ONCE(cpudata->lowest_perf);
+	value = READ_ONCE(cpudata->cppc_req_cached);
+
+	mutex_lock(&amd_pstate_limits_lock);
+	if (boot_cpu_has(X86_FEATURE_CPPC)) {
+		cpudata->epp_policy = CPUFREQ_POLICY_UNKNOWN;
+
+		/* Set max perf same as min perf */
+		value &= ~AMD_CPPC_MAX_PERF(~0L);
+		value |= AMD_CPPC_MAX_PERF(min_perf);
+		value &= ~AMD_CPPC_MIN_PERF(~0L);
+		value |= AMD_CPPC_MIN_PERF(min_perf);
+		wrmsrl_on_cpu(cpudata->cpu, MSR_AMD_CPPC_REQ, value);
+	} else {
+		perf_ctrls.desired_perf = 0;
+		perf_ctrls.max_perf = min_perf;
+		perf_ctrls.energy_perf = AMD_CPPC_ENERGY_PERF_PREF(AMD_CPPC_EPP_POWERSAVE);
+		cppc_set_perf(cpudata->cpu, &perf_ctrls);
+	}
+	mutex_unlock(&amd_pstate_limits_lock);
+}
+
+static int amd_pstate_cpu_offline(struct cpufreq_policy *policy)
+{
+	struct amd_cpudata *cpudata = all_cpu_data[policy->cpu];
+
+	pr_debug("AMD CPU Core %d going offline\n", cpudata->cpu);
+
+	if (cpudata->suspended)
+		return 0;
+
+	if (pstate_exiting)
+		return 0;
+
+	if (epp_enabled)
+		amd_pstate_epp_offline(policy);
+
+	return 0;
+}
+
+static int amd_pstate_epp_cpu_offline(struct cpufreq_policy *policy)
+{
+	amd_pstate_clear_update_util_hook(policy->cpu);
+
+	return amd_pstate_cpu_offline(policy);
+}
+
+static void amd_pstate_verify_cpu_policy(struct amd_cpudata *cpudata,
+					   struct cpufreq_policy_data *policy)
+{
+	update_boost_state();
+	cpufreq_verify_within_cpu_limits(policy);
+}
+
+static int amd_pstate_epp_verify_policy(struct cpufreq_policy_data *policy)
+{
+	amd_pstate_verify_cpu_policy(all_cpu_data[policy->cpu], policy);
+	pr_debug("policy_max =%d, policy_min=%d\n", policy->max, policy->min);
+	return 0;
+}
+
 static struct cpufreq_driver amd_pstate_driver = {
 	.flags		= CPUFREQ_CONST_LOOPS | CPUFREQ_NEED_UPDATE_LIMITS,
 	.verify		= amd_pstate_verify,
@@ -675,8 +1545,24 @@ static struct cpufreq_driver amd_pstate_driver = {
 	.attr           = amd_pstate_attr,
 };

+static struct cpufreq_driver amd_pstate_epp_driver = {
+	.flags		= CPUFREQ_CONST_LOOPS,
+	.verify		= amd_pstate_epp_verify_policy,
+	.setpolicy	= amd_pstate_epp_set_policy,
+	.init		= amd_pstate_epp_cpu_init,
+	.exit		= amd_pstate_epp_cpu_exit,
+	.update_limits	= amd_pstate_epp_update_limits,
+	.offline	= amd_pstate_epp_cpu_offline,
+	.online		= amd_pstate_epp_cpu_online,
+	.suspend        = amd_pstate_epp_suspend,
+	.resume         = amd_pstate_epp_resume,
+	.name		= "amd_pstate_epp",
+	.attr		= amd_pstate_epp_attr,
+};
+
 static int __init amd_pstate_init(void)
 {
+	static struct amd_cpudata **cpudata;
 	int ret;

 	if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD)
@@ -691,10 +1577,24 @@ static int __init amd_pstate_init(void)
 	if (cpufreq_get_current_driver())
 		return -EEXIST;

+	cpudata = vzalloc(array_size(sizeof(void *), num_possible_cpus()));
+	if (!cpudata)
+		return -ENOMEM;
+	WRITE_ONCE(all_cpu_data, cpudata);
+
+	if (epp_enabled) {
+		pr_info("AMD CPPC loading with amd_pstate_epp driver instance.\n");
+		default_pstate_driver = &amd_pstate_epp_driver;
+	} else {
+		pr_info("AMD CPPC loading with amd_pstate driver instance.\n");
+		default_pstate_driver = &amd_pstate_driver;
+	}
+
 	/* capability check */
 	if (boot_cpu_has(X86_FEATURE_CPPC)) {
+		if (!epp_enabled)
+			default_pstate_driver->adjust_perf = amd_pstate_adjust_perf;
 		pr_debug("AMD CPPC MSR based functionality is supported\n");
-		amd_pstate_driver.adjust_perf = amd_pstate_adjust_perf;
 	} else if (shared_mem) {
 		static_call_update(amd_pstate_enable, cppc_enable);
 		static_call_update(amd_pstate_init_perf, cppc_init_perf);
@@ -711,19 +1611,57 @@ static int __init amd_pstate_init(void)
 		return ret;
 	}

-	ret = cpufreq_register_driver(&amd_pstate_driver);
+	ret = cpufreq_register_driver(default_pstate_driver);
 	if (ret)
-		pr_err("failed to register amd_pstate_driver with return %d\n",
+		pr_err("failed to register amd pstate driver with return %d\n",
 		       ret);

+	amd_pstate_kobj = kobject_create_and_add("amd-pstate", &cpu_subsys.dev_root->kobj);
+	if (!amd_pstate_kobj)
+		pr_err("amd-pstate: Global sysfs registration failed.\n");
+
+	ret = sysfs_create_group(amd_pstate_kobj, &amd_pstate_global_attr_group);
+	if (ret) {
+		pr_err("amd-pstate: Sysfs attribute export failed with error %d.\n",
+		       ret);
+	}
+	pstate_exiting = false;
+
 	return ret;
 }

+static inline void amd_pstate_kobj_cleanup(struct kobject *kobj)
+{
+	kobject_del(kobj);
+	kobject_put(kobj);
+}
+
 static void __exit amd_pstate_exit(void)
 {
-	cpufreq_unregister_driver(&amd_pstate_driver);
+	unsigned int cpu;
+
+	pstate_exiting = true;
+	cpufreq_unregister_driver(default_pstate_driver);

 	amd_pstate_enable(false);
+
+	sysfs_remove_group(amd_pstate_kobj, &amd_pstate_global_attr_group);
+	amd_pstate_kobj_cleanup(amd_pstate_kobj);
+
+	cpus_read_lock();
+	for_each_online_cpu(cpu) {
+		if (all_cpu_data[cpu]) {
+			if (default_pstate_driver == &amd_pstate_epp_driver)
+				amd_pstate_clear_update_util_hook(cpu);
+
+			spin_lock(&amd_pstate_cpu_lock);
+			kfree(all_cpu_data[cpu]);
+			WRITE_ONCE(all_cpu_data[cpu], NULL);
+			spin_unlock(&amd_pstate_cpu_lock);
+		}
+	}
+	cpus_read_unlock();
+
 }

 module_init(amd_pstate_init);
diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c
index 69b3d61852ac..a491fea4985e 100644
--- a/drivers/cpufreq/cpufreq.c
+++ b/drivers/cpufreq/cpufreq.c
@@ -262,6 +262,7 @@ void cpufreq_cpu_release(struct cpufreq_policy *policy)

 	cpufreq_cpu_put(policy);
 }
+EXPORT_SYMBOL_GPL(cpufreq_cpu_release);

 /**
  * cpufreq_cpu_acquire - Find policy for a CPU, mark it as busy and lock it.
@@ -291,6 +292,7 @@ struct cpufreq_policy *cpufreq_cpu_acquire(unsigned int cpu)

 	return policy;
 }
+EXPORT_SYMBOL_GPL(cpufreq_cpu_acquire);

 /*********************************************************************
  *            EXTERNALLY AFFECTING FREQUENCY CHANGES                 *
diff --git a/include/acpi/cppc_acpi.h b/include/acpi/cppc_acpi.h
index f73d357ecdf5..41d151a6d52e 100644
--- a/include/acpi/cppc_acpi.h
+++ b/include/acpi/cppc_acpi.h
@@ -108,12 +108,14 @@ struct cppc_perf_caps {
 	u32 lowest_nonlinear_perf;
 	u32 lowest_freq;
 	u32 nominal_freq;
+	u32 energy_perf;
 };

 struct cppc_perf_ctrls {
 	u32 max_perf;
 	u32 min_perf;
 	u32 desired_perf;
+	u32 energy_perf;
 };

 struct cppc_perf_fb_ctrs {
@@ -148,6 +150,9 @@ extern bool cpc_ffh_supported(void);
 extern bool cpc_supported_by_cpu(void);
 extern int cpc_read_ffh(int cpunum, struct cpc_reg *reg, u64 *val);
 extern int cpc_write_ffh(int cpunum, struct cpc_reg *reg, u64 val);
+extern int cppc_set_auto_epp(int cpu, bool enable);
+extern int cppc_get_epp_caps(int cpunum, struct cppc_perf_caps *perf_caps);
+extern int cppc_set_epp_perf(int cpu, struct cppc_perf_ctrls *perf_ctrls);
 #else /* !CONFIG_ACPI_CPPC_LIB */
 static inline int cppc_get_desired_perf(int cpunum, u64 *desired_perf)
 {
@@ -197,6 +202,18 @@ static inline int cpc_write_ffh(int cpunum, struct cpc_reg *reg, u64 val)
 {
 	return -ENOTSUPP;
 }
+static inline int cppc_set_auto_epp(int cpu, bool enable)
+{
+	return -ENOTSUPP;
+}
+static inline int cppc_set_epp_perf(int cpu, struct cppc_perf_ctrls *perf_ctrls)
+{
+	return -ENOTSUPP;
+}
+static inline int cppc_get_epp_caps(int cpunum, struct cppc_perf_caps *perf_caps)
+{
+	return -ENOTSUPP;
+}
 #endif /* !CONFIG_ACPI_CPPC_LIB */

 #endif /* _CPPC_ACPI_H*/
--
2.38.1