From patchwork Sat Feb 15 00:54:45 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mario Limonciello X-Patchwork-Id: 865449 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 CFCD717799F; Sat, 15 Feb 2025 00:55:00 +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=1739580900; cv=none; b=cPylU+dxqP+ghSX3tl+uoKIEpDPqafPFgCW6NnnU/2JYH+ijClEe7KGviaByb4PyqlpYoHeuByyd+zELS176OY8IhG53b8cnPjmiCBHHVAHx+slyedOQK/JjD4wr+FZ289Lg/ERznfXfwsUCHvioyemKkbYsPhPSJCLRMLtxCAk= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1739580900; c=relaxed/simple; bh=1fpLNpbPgcGKVyKFjXfajuXkpkQU1RnDwuoelu2h1hA=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=cyHLweeoWehOqDkpDUGSHSGw83I6tON/3v0KKongbmvMCDiIfpa72vBb4TNNtbfn1h7cD61R26nnNmPRJgPJ1R1IjQUr0ONsMwG94dV7eQMqbetP0MZwFPfhEUC82QjtYLlnMjeGhDnZ7uw7l52OzKX0xyp6wI4qqVQnwmcmnfs= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=YddGIKYE; 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="YddGIKYE" Received: by smtp.kernel.org (Postfix) with ESMTPSA id A8E75C4CEE6; Sat, 15 Feb 2025 00:54:59 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1739580900; bh=1fpLNpbPgcGKVyKFjXfajuXkpkQU1RnDwuoelu2h1hA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=YddGIKYErMpOWrvP7ibByOQSoPHmSapgD5CnvVBt9qSJmTN8L3xR1HxWfR0EhAak3 7WhzzEbPx404wYLtmD4Diwb3HXJm7k7qSx8/QF9a7A/MdQ7/sRBSrvDowdGdlMcp4H zcVOoWoxIwQH1WbM37idOMrZiVSHFPd4vvn7aKrW7a+cq4hkRuQO5MzlPZg3LXXfzh c3Ic3HwVObsCpDI9vNBz+71dRo0JUVKI9L0P19dYSFTCPXuU3bvA4B12R+miVZ/zCk greQQs61lfTpKD547J3q5IwEZ/PXGwWrLfdCpRyFxW9BSMgerZ6QwmIQ5Xy0SDcwrG wSIULkBI9LKqw== From: Mario Limonciello To: "Gautham R . Shenoy" , Perry Yuan Cc: Dhananjay Ugwekar , 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 Subject: [PATCH 2/5] cpufreq/amd-pstate: add kernel command line to override dynamic epp Date: Fri, 14 Feb 2025 18:54:45 -0600 Message-ID: <20250215005448.1216646-3-superm1@kernel.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250215005448.1216646-1-superm1@kernel.org> References: <20250215005448.1216646-1-superm1@kernel.org> Precedence: bulk X-Mailing-List: linux-pm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: Mario Limonciello Add `amd_dynamic_epp=enable` and `amd_dynamic_epp=disable` to override the kernel configuration option `CONFIG_X86_AMD_PSTATE_DYNAMIC_EPP` locally. Signed-off-by: Mario Limonciello --- Documentation/admin-guide/kernel-parameters.txt | 7 +++++++ Documentation/admin-guide/pm/amd-pstate.rst | 7 +++++++ drivers/cpufreq/amd-pstate.c | 11 +++++++++++ 3 files changed, 25 insertions(+) diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index fb8752b42ec85..1afe6d8ab09bb 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -392,6 +392,13 @@ disable Disable amd-pstate preferred core. + amd_dynamic_epp= + [X86] + disable + Disable amd-pstate dynamic EPP. + enable + Enable amd-pstate dynamic EPP. + amijoy.map= [HW,JOY] Amiga joystick support Map of devices attached to JOY0DAT and JOY1DAT Format: , diff --git a/Documentation/admin-guide/pm/amd-pstate.rst b/Documentation/admin-guide/pm/amd-pstate.rst index 2e076650dc77c..8424e7119dd7e 100644 --- a/Documentation/admin-guide/pm/amd-pstate.rst +++ b/Documentation/admin-guide/pm/amd-pstate.rst @@ -438,6 +438,13 @@ For systems that support ``amd-pstate`` preferred core, the core rankings will always be advertised by the platform. But OS can choose to ignore that via the kernel parameter ``amd_prefcore=disable``. +``amd_dynamic_epp`` + +When AMD pstate is in auto mode, dynamic EPP will control whether the kernel +autonomously changes the EPP mode. The default is configured by +``CONFIG_X86_AMD_PSTATE_DYNAMIC_EPP`` but can be explicitly enabled with +``amd_pstate_epp=enable`` or disabled with ``amd_pstate_epp=disable``. + User Space Interface in ``sysfs`` - General =========================================== diff --git a/drivers/cpufreq/amd-pstate.c b/drivers/cpufreq/amd-pstate.c index 95cf8ac29b08c..f72f385f9f92e 100644 --- a/drivers/cpufreq/amd-pstate.c +++ b/drivers/cpufreq/amd-pstate.c @@ -1969,8 +1969,19 @@ static int __init amd_prefcore_param(char *str) return 0; } +static int __init amd_dynamic_epp_param(char *str) +{ + if (!strcmp(str, "disable")) + dynamic_epp = false; + if (!strcmp(str, "enable")) + dynamic_epp = true; + + return 0; +} + early_param("amd_pstate", amd_pstate_param); early_param("amd_prefcore", amd_prefcore_param); +early_param("amd_dynamic_epp", amd_dynamic_epp_param); MODULE_AUTHOR("Huang Rui "); MODULE_DESCRIPTION("AMD Processor P-state Frequency Driver");