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Sat, 10 May 2025 09:58:47 +0000 Message-ID: <621ff36f-eaa7-4dba-909a-e50977abf6dc@intel.com> Date: Sat, 10 May 2025 17:58:36 +0800 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v4 05/31] fs/resctrl: Set up Kconfig options for telemetry events To: Tony Luck CC: , , , Peter Newman , James Morse , Dave Martin , Babu Moger , Anil Keshavamurthy , Drew Fustini , Fenghua Yu , Maciej Wieczor-Retman , Reinette Chatre References: <20250429003359.375508-1-tony.luck@intel.com> <20250429003359.375508-6-tony.luck@intel.com> Content-Language: en-US From: "Chen, Yu C" In-Reply-To: <20250429003359.375508-6-tony.luck@intel.com> Content-Type: text/plain; charset="UTF-8"; format=flowed Content-Transfer-Encoding: 8bit X-ClientProxiedBy: KU0P306CA0078.MYSP306.PROD.OUTLOOK.COM (2603:1096:d10:2b::10) To DM4PR11MB6020.namprd11.prod.outlook.com (2603:10b6:8:61::19) Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DM4PR11MB6020:EE_|DS0PR11MB7879:EE_ X-MS-Office365-Filtering-Correlation-Id: b763fed4-dfe4-4697-64e3-08dd8fa94168 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|366016|1800799024; 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Patches for the Intel PMT system are still in progress. > They will define an INTEL_PMT_DISCOVERY Kconfig symbol that > will be one of the dependencies. This is commented out for > now. Final version will include this dependency. > > arch/x86 selects this option based on: > > X86_64: Counter registers are in MMIO space. There is no readq() > function on 32-bit. Emulation is possible with readl(), but there > are races. Running 32-bit kernels on systems that support this > feature seems pointless. > > CPU_SUP_INTEL: It is an Intel specific feature. > > Signed-off-by: Tony Luck > --- > arch/x86/Kconfig | 1 + > drivers/platform/x86/intel/pmt/Kconfig | 7 +++++++ > 2 files changed, 8 insertions(+) > > diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig > index 5a09acf41c8e..19107fdb4264 100644 > --- a/arch/x86/Kconfig > +++ b/arch/x86/Kconfig > @@ -508,6 +508,7 @@ config X86_CPU_RESCTRL > bool "x86 CPU resource control support" > depends on X86 && (CPU_SUP_INTEL || CPU_SUP_AMD) > depends on MISC_FILESYSTEMS > + select INTEL_AET_RESCTRL if (X86_64 && CPU_SUP_INTEL) Not sure if if it is expected, I got the following warning during compiling: WARNING: unmet direct dependencies detected for INTEL_AET_RESCTRL Depends on [n]: X86_PLATFORM_DEVICES [=y] && INTEL_PMT_TELEMETRY [=n] Selected by [y]: - X86_CPU_RESCTRL [=y] && X86 [=y] && (CPU_SUP_INTEL [=y] || CPU_SUP_AMD [=y]) && MISC_FILESYSTEMS [=y] && X86_64 [=y] && CPU_SUP_INTEL [=y] I think this is because the INTEL_PMT_TELEMETRY is disabled. Does it make sense to add the dependency of INTEL_PMT_TELEMETRY to auto-select for INTEL_AET_RESCTRL? select INTEL_AET_RESCTRL if (X86_64 && CPU_SUP_INTEL && INTEL_PMT_TELEMETRY) thanks， Chenyu > select ARCH_HAS_CPU_RESCTRL > select RESCTRL_FS > select RESCTRL_FS_PSEUDO_LOCK > diff --git a/drivers/platform/x86/intel/pmt/Kconfig b/drivers/platform/x86/intel/pmt/Kconfig > index e916fc966221..3a8ce39d1004 100644 > --- a/drivers/platform/x86/intel/pmt/Kconfig > +++ b/drivers/platform/x86/intel/pmt/Kconfig > @@ -38,3 +38,10 @@ config INTEL_PMT_CRASHLOG > > To compile this driver as a module, choose M here: the module > will be called intel_pmt_crashlog. > + > +config INTEL_AET_RESCTRL > + depends on INTEL_PMT_TELEMETRY # && INTEL_PMT_DISCOVERY > + bool > + help > + Architecture config should "select" this option to enable > + support for RMID telemetry events in the resctrl file system.