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b=ZADweHueF+UzVLUOuPGpC64fPzDbCdUzhBY6pATytXm2BXEgUckGiCrv2FiOwzHFFTc9GUYcuS0fitPxpv+gX4G2T1Fc9w5SAybsCtzlRQr4U6utXZLD5/KsEgEi9nM1ieWn+YX9TkIYMNXdXoVN+LWE493p2uuW0MOGOKWKJ3lPZRhhbWNq5gMYJxIWgncX6gK+Mq2Iz1mDy+xtiv+u8+Tc5ZyWWbfYijbOJZWGR6kEPboQiNIetOrSZ3umoatrfnrNmeWQP/Rk7ZiUOZZXnxtVNv5XBVQFTaHNUVV3EBWL0Scb09jvxmweeg/G3IWSq2Jwjd6mVwqSXDLiQyFuLQ== Authentication-Results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=nvidia.com; Received: from BN9PR12MB5179.namprd12.prod.outlook.com (2603:10b6:408:11c::18) by CH3PR12MB8725.namprd12.prod.outlook.com (2603:10b6:610:170::14) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.9203.12; Mon, 13 Oct 2025 11:59:47 +0000 Received: from BN9PR12MB5179.namprd12.prod.outlook.com ([fe80::44e5:415d:e1a8:6e42]) by BN9PR12MB5179.namprd12.prod.outlook.com ([fe80::44e5:415d:e1a8:6e42%7]) with mapi id 15.20.9203.009; Mon, 13 Oct 2025 11:59:46 +0000 Message-ID: <43243a37-db14-49aa-8338-dc7ca446b94e@nvidia.com> Date: Mon, 13 Oct 2025 17:29:33 +0530 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3 6/8] cpufreq: CPPC: Add sysfs for min/max_perf and perf_limited To: Jie Zhan , rafael@kernel.org, viresh.kumar@linaro.org, lenb@kernel.org, robert.moore@intel.com, corbet@lwn.net, pierre.gondois@arm.com, zhenglifeng1@huawei.com, rdunlap@infradead.org, ray.huang@amd.com, gautham.shenoy@amd.com, mario.limonciello@amd.com, perry.yuan@amd.com, linux-pm@vger.kernel.org, linux-acpi@vger.kernel.org, linux-doc@vger.kernel.org, acpica-devel@lists.linux.dev, linux-kernel@vger.kernel.org Cc: linux-tegra@vger.kernel.org, treding@nvidia.com, jonathanh@nvidia.com, vsethi@nvidia.com, ksitaraman@nvidia.com, sanjayc@nvidia.com, bbasu@nvidia.com, sumitg@nvidia.com References: <20251001150104.1275188-1-sumitg@nvidia.com> <20251001150104.1275188-7-sumitg@nvidia.com> <0dca2bf6-0f87-422d-a348-5ab33a9683d2@hisilicon.com> Content-Language: en-US From: Sumit Gupta In-Reply-To: <0dca2bf6-0f87-422d-a348-5ab33a9683d2@hisilicon.com> Content-Type: text/plain; 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This file >> + conveys the minimum performance level at which the platform >> + may run. Minimum performance may be set to any performance >> + value in the range [Lowest Performance, Highest Performance], >> + inclusive but must be set to a value that is less than or >> + equal to that specified by the Maximum Performance Register. >> + >> + Writing to this file only has meaning when Autonomous Selection >> + is enabled. >> + >> + This file is only present if the cppc-cpufreq driver is in use. >> + >> +What: /sys/devices/system/cpu/cpuX/cpufreq/max_perf >> +Date: September 2025 >> +Contact: linux-pm@vger.kernel.org >> +Description: Minimum Performance > Not adapted Sorry, i missed this. Will update here and below. Thank you, Sumit >> + >> + Read/write a 32 bits value from/to this file. This file conveys >> + the maximum performance level at which the platform may run. >> + Maximum performance may be set to any performance value in the >> + range [Lowest Performance, Highest Performance], inclusive. >> + >> + Writing to this file only has meaning when Autonomous Selection is >> + enabled. >> + >> + This file is only present if the cppc-cpufreq driver is in use. >> + >> +What: /sys/devices/system/cpu/cpuX/cpufreq/perf_limited >> +Date: September 2025 >> +Contact: linux-pm@vger.kernel.org >> +Description: Minimum Performance > Not adapted Ack. >> + >> + Read/write a 32 bits value from/to this file. This file indicates >> + to OSPM that an unpredictable event has limited processor >> + performance, and the delivered performance may be less than >> + desired/minimum performance. >> + >> + This file is only present if the cppc-cpufreq driver is in use. >> >> What: /sys/devices/system/cpu/cpu*/cache/index3/cache_disable_{0,1} >> Date: August 2008