From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id DECCA389479; Sun, 29 Mar 2026 20:38:26 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774816706; cv=none; b=dyl48IpCgiA7GWbQnkjolNCJmuDB/JwHZR7OMHAmzcAsac5ADbx5Ud9Q0IhUxS0NL9Wu/nJxUMIYenTXkwIlB50UmA2Iq+nzepXKE35krTYwTpvujIt1B5Fn+W2O6ylYhR2Ad0TstfyFAHLESoYSn9KjPT49+Elzze1JYkE+4w4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774816706; c=relaxed/simple; bh=AGsSTM+llb6mv1B4bpZ//DjsWmnGIovZaLNlN1yCTsE=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=IAJYmqIO2S2SXl6cyFYSFNheveSvMJ/gr3ubrCUhtOBaNz6TnKBW+TPbS6cVEY5cNVbVhqgYt9DFjRSIw2GVrb5VOcMHcATousFLBDCS41eGRkVUlCG/uIrMETGVqFZgBithsTrJ+QYD0+ORXbFB9lVDTAII8fYcRnbU9M87COw= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=XVOZRi5T; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="XVOZRi5T" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 3ABE8C116C6; Sun, 29 Mar 2026 20:38:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1774816706; bh=AGsSTM+llb6mv1B4bpZ//DjsWmnGIovZaLNlN1yCTsE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=XVOZRi5TWQUN8BLeawHCV7ytkrr9FGdzclyhPZBbxbT28KwnCaWbhGXW1xl3pf49f RtCCJhtEWLwGKVEYbeQPhi1u7CV8O44LU8+nR4jQGGt4Aahl6McPX5L/A9D62iTZGc UGUIBWqMu6M/mhTWJC43jPDoXWmtOS8WyzYBrXPyZkQlKPUD8/5JeBWvFK0fNy9ZhR lDeJIlwY/CeY5gPnQ7qRxsdGuAj4sq5RR+Xe7T2jFj2JmZkxk12n+1wNbG/o0wDqju qcONUru1ACc+OttEpl6DRf9rrtSasAw9oc9SX+uau2CEn7zuyEiameKaCR7nfhZSTc jJPWzw8N+f10A== From: "Mario Limonciello (AMD)" To: "Gautham R . Shenoy" Cc: Perry Yuan , linux-kernel@vger.kernel.org (open list:X86 ARCHITECTURE (32-BIT AND 64-BIT)), linux-pm@vger.kernel.org (open list:CPU FREQUENCY SCALING FRAMEWORK), "Mario Limonciello (AMD)" Subject: [PATCH v6 3/5] cpufreq/amd-pstate: Add support for platform profile class Date: Sun, 29 Mar 2026 15:38:09 -0500 Message-ID: <20260329203811.2590633-4-superm1@kernel.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260329203811.2590633-1-superm1@kernel.org> References: <20260329203811.2590633-1-superm1@kernel.org> Precedence: bulk X-Mailing-List: linux-pm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit The platform profile core allows multiple drivers and devices to register platform profile support. When the legacy platform profile interface is used all drivers will adjust the platform profile as well. Add support for registering every CPU with the platform profile handler when dynamic EPP is enabled. The end result will be that changing the platform profile will modify EPP accordingly. Signed-off-by: Mario Limonciello (AMD) --- v5->v6: * Keep the platform profile patch focused on platform profile support * Move the raw EPP plumbing into the follow-up raw EPP patch * Move the test helper exports into the unit-test patch --- Documentation/admin-guide/pm/amd-pstate.rst | 4 +- drivers/cpufreq/Kconfig.x86 | 1 + drivers/cpufreq/amd-pstate.c | 110 ++++++++++++++++++-- drivers/cpufreq/amd-pstate.h | 6 ++ 4 files changed, 114 insertions(+), 7 deletions(-) diff --git a/Documentation/admin-guide/pm/amd-pstate.rst b/Documentation/admin-guide/pm/amd-pstate.rst index 210207d301aa5..2d92c8072b83c 100644 --- a/Documentation/admin-guide/pm/amd-pstate.rst +++ b/Documentation/admin-guide/pm/amd-pstate.rst @@ -357,7 +357,9 @@ Whether this behavior is enabled by default with the kernel config option at runtime by the sysfs file ``/sys/devices/system/cpu/cpufreq/policyX/dynamic_epp``. When set to enabled, the driver will select a different energy performance -profile when the machine is running on battery or AC power. +profile when the machine is running on battery or AC power. The driver will +also register with the platform profile handler to receive notifications of +user desired power state and react to those. When set to disabled, the driver will not change the energy performance profile based on the power source and will not react to user desired power state. diff --git a/drivers/cpufreq/Kconfig.x86 b/drivers/cpufreq/Kconfig.x86 index cdaa8d858045a..a0dbb9808ae99 100644 --- a/drivers/cpufreq/Kconfig.x86 +++ b/drivers/cpufreq/Kconfig.x86 @@ -40,6 +40,7 @@ config X86_AMD_PSTATE select ACPI_PROCESSOR select ACPI_CPPC_LIB if X86_64 select CPU_FREQ_GOV_SCHEDUTIL if SMP + select ACPI_PLATFORM_PROFILE help This driver adds a CPUFreq driver which utilizes a fine grain processor performance frequency control range instead of legacy diff --git a/drivers/cpufreq/amd-pstate.c b/drivers/cpufreq/amd-pstate.c index e96f1da5c7b38..93cda05ffa855 100644 --- a/drivers/cpufreq/amd-pstate.c +++ b/drivers/cpufreq/amd-pstate.c @@ -1182,6 +1182,10 @@ static int amd_pstate_power_supply_notifier(struct notifier_block *nb, if (event != PSY_EVENT_PROP_CHANGED) return NOTIFY_OK; + /* dynamic actions are only applied while platform profile is in balanced */ + if (cpudata->current_profile != PLATFORM_PROFILE_BALANCED) + return 0; + epp = amd_pstate_get_balanced_epp(policy); ret = amd_pstate_set_epp(policy, epp); @@ -1190,12 +1194,81 @@ static int amd_pstate_power_supply_notifier(struct notifier_block *nb, return NOTIFY_OK; } + +static int amd_pstate_profile_probe(void *drvdata, unsigned long *choices) +{ + set_bit(PLATFORM_PROFILE_LOW_POWER, choices); + set_bit(PLATFORM_PROFILE_BALANCED, choices); + set_bit(PLATFORM_PROFILE_PERFORMANCE, choices); + + return 0; +} + +static int amd_pstate_profile_get(struct device *dev, + enum platform_profile_option *profile) +{ + struct amd_cpudata *cpudata = dev_get_drvdata(dev); + + *profile = cpudata->current_profile; + + return 0; +} + +static int amd_pstate_profile_set(struct device *dev, + enum platform_profile_option profile) +{ + struct amd_cpudata *cpudata = dev_get_drvdata(dev); + struct cpufreq_policy *policy __free(put_cpufreq_policy) = cpufreq_cpu_get(cpudata->cpu); + int ret; + + switch (profile) { + case PLATFORM_PROFILE_LOW_POWER: + if (cpudata->policy != CPUFREQ_POLICY_POWERSAVE) + cpudata->policy = CPUFREQ_POLICY_POWERSAVE; + ret = amd_pstate_set_epp(policy, AMD_CPPC_EPP_POWERSAVE); + if (ret) + return ret; + break; + case PLATFORM_PROFILE_BALANCED: + if (cpudata->policy != CPUFREQ_POLICY_POWERSAVE) + cpudata->policy = CPUFREQ_POLICY_POWERSAVE; + ret = amd_pstate_set_epp(policy, + amd_pstate_get_balanced_epp(policy)); + if (ret) + return ret; + break; + case PLATFORM_PROFILE_PERFORMANCE: + ret = amd_pstate_set_epp(policy, AMD_CPPC_EPP_PERFORMANCE); + if (ret) + return ret; + break; + default: + pr_err("Unknown Platform Profile %d\n", profile); + return -EOPNOTSUPP; + } + + cpudata->current_profile = profile; + + return 0; +} + +static const struct platform_profile_ops amd_pstate_profile_ops = { + .probe = amd_pstate_profile_probe, + .profile_set = amd_pstate_profile_set, + .profile_get = amd_pstate_profile_get, +}; + static void amd_pstate_clear_dynamic_epp(struct cpufreq_policy *policy) { struct amd_cpudata *cpudata = policy->driver_data; if (cpudata->power_nb.notifier_call) power_supply_unreg_notifier(&cpudata->power_nb); + if (cpudata->ppdev) { + platform_profile_remove(cpudata->ppdev); + cpudata->ppdev = NULL; + } + kfree(cpudata->profile_name); cpudata->dynamic_epp = false; } @@ -1206,11 +1279,35 @@ static int amd_pstate_set_dynamic_epp(struct cpufreq_policy *policy) u8 epp; policy->policy = CPUFREQ_POLICY_PERFORMANCE; - epp = amd_pstate_get_balanced_epp(policy); + switch (cpudata->current_profile) { + case PLATFORM_PROFILE_PERFORMANCE: + epp = AMD_CPPC_EPP_PERFORMANCE; + break; + case PLATFORM_PROFILE_LOW_POWER: + epp = AMD_CPPC_EPP_POWERSAVE; + break; + case PLATFORM_PROFILE_BALANCED: + epp = amd_pstate_get_balanced_epp(policy); + break; + default: + pr_err("Unknown Platform Profile %d\n", cpudata->current_profile); + return -EOPNOTSUPP; + } ret = amd_pstate_set_epp(policy, epp); if (ret) return ret; + cpudata->profile_name = kasprintf(GFP_KERNEL, "amd-pstate-epp-cpu%d", cpudata->cpu); + + cpudata->ppdev = platform_profile_register(get_cpu_device(policy->cpu), + cpudata->profile_name, + policy->driver_data, + &amd_pstate_profile_ops); + if (IS_ERR(cpudata->ppdev)) { + ret = PTR_ERR(cpudata->ppdev); + goto cleanup; + } + /* only enable notifier if things will actually change */ if (cpudata->epp_default_ac != cpudata->epp_default_dc) { cpudata->power_nb.notifier_call = amd_pstate_power_supply_notifier; @@ -1311,8 +1408,8 @@ static ssize_t show_energy_performance_available_preferences( return offset; } -static ssize_t store_energy_performance_preference( - struct cpufreq_policy *policy, const char *buf, size_t count) +static ssize_t store_energy_performance_preference(struct cpufreq_policy *policy, + const char *buf, size_t count) { struct amd_cpudata *cpudata = policy->driver_data; ssize_t ret; @@ -1332,7 +1429,7 @@ static ssize_t store_energy_performance_preference( else epp = amd_pstate_get_balanced_epp(policy); - if (epp > 0 && policy->policy == CPUFREQ_POLICY_PERFORMANCE) { + if (epp > 0 && cpudata->policy == CPUFREQ_POLICY_PERFORMANCE) { pr_debug("EPP cannot be set under performance policy\n"); return -EBUSY; } @@ -1344,8 +1441,7 @@ static ssize_t store_energy_performance_preference( return ret ? ret : count; } -static ssize_t show_energy_performance_preference( - struct cpufreq_policy *policy, char *buf) +static ssize_t show_energy_performance_preference(struct cpufreq_policy *policy, char *buf) { struct amd_cpudata *cpudata = policy->driver_data; u8 preference, epp; @@ -1825,10 +1921,12 @@ static int amd_pstate_epp_cpu_init(struct cpufreq_policy *policy) amd_pstate_acpi_pm_profile_undefined()) { policy->policy = CPUFREQ_POLICY_PERFORMANCE; cpudata->epp_default_ac = cpudata->epp_default_dc = amd_pstate_get_epp(cpudata); + cpudata->current_profile = PLATFORM_PROFILE_PERFORMANCE; } else { policy->policy = CPUFREQ_POLICY_POWERSAVE; cpudata->epp_default_ac = AMD_CPPC_EPP_PERFORMANCE; cpudata->epp_default_dc = AMD_CPPC_EPP_BALANCE_PERFORMANCE; + cpudata->current_profile = PLATFORM_PROFILE_BALANCED; } if (dynamic_epp) diff --git a/drivers/cpufreq/amd-pstate.h b/drivers/cpufreq/amd-pstate.h index d929ae3163b3d..a7e52f79a8029 100644 --- a/drivers/cpufreq/amd-pstate.h +++ b/drivers/cpufreq/amd-pstate.h @@ -9,6 +9,7 @@ #define _LINUX_AMD_PSTATE_H #include +#include /********************************************************************* * AMD P-state INTERFACE * @@ -127,6 +128,11 @@ struct amd_cpudata { u8 epp_default_dc; bool dynamic_epp; struct notifier_block power_nb; + + /* platform profile */ + enum platform_profile_option current_profile; + struct device *ppdev; + char *profile_name; }; /* -- 2.43.0