From patchwork Sat Mar 28 12:57:48 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Rafael J. Wysocki" X-Patchwork-Id: 11463527 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 4FA326CA for ; Sat, 28 Mar 2020 12:58:30 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 382BD206E6 for ; Sat, 28 Mar 2020 12:58:30 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726271AbgC1M60 (ORCPT ); Sat, 28 Mar 2020 08:58:26 -0400 Received: from cloudserver094114.home.pl ([79.96.170.134]:58417 "EHLO cloudserver094114.home.pl" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726045AbgC1M60 (ORCPT ); Sat, 28 Mar 2020 08:58:26 -0400 Received: from 185.80.35.16 (185.80.35.16) (HELO kreacher.localnet) by serwer1319399.home.pl (79.96.170.134) with SMTP (IdeaSmtpServer 0.83.341) id 9c4c29803feb8bf4; Sat, 28 Mar 2020 13:58:24 +0100 From: "Rafael J. Wysocki" To: Linux PM Cc: Srinivas Pandruvada , LKML , "Rafael J. Wysocki" , Viresh Kumar , Giovanni Gherdovich , Doug Smythies Subject: [PATCH 2/2] cpufreq: intel_pstate: Use passive mode by default without HWP Date: Sat, 28 Mar 2020 13:57:48 +0100 Message-ID: <2988949.NgUrjYMkJj@kreacher> In-Reply-To: <2016232.ihCVsphvri@kreacher> References: <2016232.ihCVsphvri@kreacher> MIME-Version: 1.0 Sender: linux-pm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org From: "Rafael J. Wysocki" After recent changes allowing scale-invariant utilization to be used on x86, the schedutil governor on top of intel_pstate in the passive mode should be on par with (or better than) the active mode "powersave" algorithm of intel_pstate on systems in which hardware-managed P-states (HWP) are not used, so it should not be necessary to use the internal scaling algorithm in those cases. Accordingly, modify intel_pstate to start in the passive mode by default if the processor at hand does not support HWP of if the driver is requested to avoid using HWP through the kernel command line. Among other things, that will allow utilization clamps and the support for RT/DL tasks in the schedutil governor to be utilized on systems in which intel_pstate is used. Signed-off-by: Rafael J. Wysocki --- Documentation/admin-guide/pm/intel_pstate.rst | 32 ++++++++++++++++----------- drivers/cpufreq/intel_pstate.c | 3 ++- 2 files changed, 21 insertions(+), 14 deletions(-) diff --git a/Documentation/admin-guide/pm/intel_pstate.rst b/Documentation/admin-guide/pm/intel_pstate.rst index ad392f3aee06..39d80bc29ccd 100644 --- a/Documentation/admin-guide/pm/intel_pstate.rst +++ b/Documentation/admin-guide/pm/intel_pstate.rst @@ -62,9 +62,10 @@ on the capabilities of the processor. Active Mode ----------- -This is the default operation mode of ``intel_pstate``. If it works in this -mode, the ``scaling_driver`` policy attribute in ``sysfs`` for all ``CPUFreq`` -policies contains the string "intel_pstate". +This is the default operation mode of ``intel_pstate`` for processors with +hardware-managed P-states (HWP) support. If it works in this mode, the +``scaling_driver`` policy attribute in ``sysfs`` for all ``CPUFreq`` policies +contains the string "intel_pstate". In this mode the driver bypasses the scaling governors layer of ``CPUFreq`` and provides its own scaling algorithms for P-state selection. Those algorithms @@ -138,12 +139,13 @@ internal P-state selection logic to be less performance-focused. Active Mode Without HWP ~~~~~~~~~~~~~~~~~~~~~~~ -This is the default operation mode for processors that do not support the HWP -feature. It also is used by default with the ``intel_pstate=no_hwp`` argument -in the kernel command line. However, in this mode ``intel_pstate`` may refuse -to work with the given processor if it does not recognize it. [Note that -``intel_pstate`` will never refuse to work with any processor with the HWP -feature enabled.] +This operation mode is optional for processors that do not support the HWP +feature or when the ``intel_pstate=no_hwp`` argument is passed to the kernel in +the command line. The active mode is used in those cases if the +``intel_pstate=active`` argument is passed to the kernel in the command line. +In this mode ``intel_pstate`` may refuse to work with processors that are not +recognized by it. [Note that ``intel_pstate`` will never refuse to work with +any processor with the HWP feature enabled.] In this mode ``intel_pstate`` registers utilization update callbacks with the CPU scheduler in order to run a P-state selection algorithm, either @@ -188,10 +190,14 @@ is not set. Passive Mode ------------ -This mode is used if the ``intel_pstate=passive`` argument is passed to the -kernel in the command line (it implies the ``intel_pstate=no_hwp`` setting too). -Like in the active mode without HWP support, in this mode ``intel_pstate`` may -refuse to work with the given processor if it does not recognize it. +This is the default operation mode of ``intel_pstate`` for processors without +hardware-managed P-states (HWP) support. It is always used if the +``intel_pstate=passive`` argument is passed to the kernel in the command line +regardless of whether or not the given processor supports HWP. [Note that the +``intel_pstate=no_hwp`` setting implies ``intel_pstate=passive`` if it is used +without ``intel_pstate=active``.] Like in the active mode without HWP support, +in this mode ``intel_pstate`` may refuse to work with processors that are not +recognized by it. If the driver works in this mode, the ``scaling_driver`` policy attribute in ``sysfs`` for all ``CPUFreq`` policies contains the string "intel_cpufreq". diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c index d2297839374d..b24a5c5ec4f9 100644 --- a/drivers/cpufreq/intel_pstate.c +++ b/drivers/cpufreq/intel_pstate.c @@ -2769,6 +2769,8 @@ static int __init intel_pstate_init(void) pr_info("Invalid MSRs\n"); return -ENODEV; } + /* Without HWP start in the passive mode. */ + default_driver = &intel_cpufreq; hwp_cpu_matched: /* @@ -2814,7 +2816,6 @@ static int __init intel_pstate_setup(char *str) if (!strcmp(str, "disable")) { no_load = 1; } else if (!strcmp(str, "passive")) { - pr_info("Passive mode enabled\n"); default_driver = &intel_cpufreq; no_hwp = 1; }