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Thu, 19 Sep 2024 16:22:10 +0000 Message-ID: <56f1396e-8a51-43d3-9dd0-dc55a1623b12@intel.com> Date: Thu, 19 Sep 2024 09:22:06 -0700 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v7 06/24] x86/resctrl: Add support to enable/disable AMD ABMC feature To: Babu Moger , , , , , , CC: , , , , , , , , , , , , , , , , , , , , , , , , , , , References: <556b3576ce076c8867795d4af1bcdaf883397304.1725488488.git.babu.moger@amd.com> From: Reinette Chatre Content-Language: en-US In-Reply-To: <556b3576ce076c8867795d4af1bcdaf883397304.1725488488.git.babu.moger@amd.com> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit X-ClientProxiedBy: MW4PR04CA0064.namprd04.prod.outlook.com (2603:10b6:303:6b::9) To SJ2PR11MB7573.namprd11.prod.outlook.com (2603:10b6:a03:4d2::10) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SJ2PR11MB7573:EE_|PH0PR11MB5079:EE_ X-MS-Office365-Filtering-Correlation-Id: afe12557-9f13-459b-86ba-08dcd8c7365c X-LD-Processed: 46c98d88-e344-4ed4-8496-4ed7712e255d,ExtAddr X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|366016|7416014|376014|1800799024; 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When the state of ABMC is changed, the MSR needs > to be updated on all the logical processors in the QOS Domain. > > Hardware counters will reset when ABMC state is changed. Reset the > architectural state maintained by resctrl so that reading of a hardware > counter is not considered as an overflow in next update. Above mentions that architectural state is also reset, but that does not seem to form part of this patch? > > The ABMC feature details are documented in APM listed below [1]. > [1] AMD64 Architecture Programmer's Manual Volume 2: System Programming > Publication # 24593 Revision 3.41 section 19.3.3.3 Assignable Bandwidth > Monitoring (ABMC). > > Link: https://bugzilla.kernel.org/show_bug.cgi?id=206537 > Signed-off-by: Babu Moger > --- ... > static inline struct rdt_hw_resource *resctrl_to_arch_res(struct rdt_resource *r) > diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c > index 7e76f8d839fc..0178555bf3f6 100644 > --- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c > +++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c > @@ -2402,6 +2402,41 @@ int resctrl_arch_set_cdp_enabled(enum resctrl_res_level l, bool enable) > return 0; > } > > +/* > + * Update L3_QOS_EXT_CFG MSR on all the CPUs associated with the resource. This comment is not accurate since the function below only sets MSR on current CPU. > + */ > +static void resctrl_abmc_set_one_amd(void *arg) Reinette