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Mon, 14 Sep 2026 21:50:25 +0000 Message-ID: Date: Mon, 14 Sep 2026 14:50:23 -0700 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 1/3] x86/resctrl: Fix ABMC counter programming for extended counter ranges From: Reinette Chatre To: Babu Moger , , CC: , , , , , , , , , , , , References: <9e85f67add9ac84f55e4b0fced92ed8994f8419a.1788545152.git.babu.moger@amd.com> <10240e0e-6879-4378-8763-cb1a9baf1f2d@amd.com> <30dc55d0-511d-4f5f-92df-5dd0add354a2@intel.com> Content-Language: en-US In-Reply-To: <30dc55d0-511d-4f5f-92df-5dd0add354a2@intel.com> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 8bit X-ClientProxiedBy: MW4P221CA0021.NAMP221.PROD.OUTLOOK.COM (2603:10b6:303:8b::26) To SJ2PR11MB8370.namprd11.prod.outlook.com (2603:10b6:a03:540::20) 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: SJ2PR11MB8370:EE_|CH3PR11MB905664:EE_ X-MS-Office365-Filtering-Correlation-Id: 6c202105-2e8a-4b7c-1707-08df12aa2f07 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|23010399003|366016|7416014|376014|1800799024|6133799003|10067099003|4143699003|11063799006|56012099006|18002099003|22082099003; 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Update the cntr_id field handling to support the full hardware ABMC >>>> counter range and ensure that counter programming does not interfere with >>>> unrelated counters. >>> >>> Sashiko's assessment that this statement is not accurate looks correct to me. >>> >>> Looks like the enumeration needs a check to limit the number of supported >>> counters if the hardware supports more than what can be configured? It seems >>> awkward that such hardware could exist and unclear why the spec has a mismatch in >> >> >> You're right. The spec overlooked this scenario. I've notified the concerned team. >> >> >> Do you want me add this check? >> >> -               r->mon.num_mbm_cntrs = (ebx & GENMASK(15, 0)) + 1; >> +               r->mon.num_mbm_cntrs = (ebx & GENMASK(12, 0)) + 1; >> > > Yes please. > >> >>> the number of bits here. Even if cntr_id expands further to use the remaining >>> reserved bits it would still not be sufficient to configure all the numbers >>> that hardware may claim to support. Are there perhaps more field width changes >>> in this upcoming spec update? >> >> Two fields(ctrl_id and bw_src) in here are changing for this register. I dont know about other changes yet. >> >>> >>>> >>>> 2. Expand the bw_src field to 15 bits. >>> >>> Do the comments describing the RMID field width when reading the monitoring >>> data (__cntr_id_read() and __rmid_read_phys()) need an update also? >> >> The RMID field width is expected to change. We can revisit this when that happens. > > > This patch is that change, no? bw_src is expanded to 15 bits, and bw_src contains > the RMID. > > This is the new RMID field width for monitoring configuration, after configuration > the counter needs to be read for the monitoring data via MSR_IA32_QM_EVTSEL and per > __cntr_id_read() the RMID field is still restricted (although not enforce by resctrl) > to 12 bits: > > * 43:32 RMID RMID or counter ID in ABMC mode > > resctrl also supports switching between "default" and "mbm_event" mode and there > is no support for the number of RMIDs changing between the modes ... this reading > an event in "default" mode should support the same number of RMIDs as > "mbm_event" mode and we see in __rmid_read_phys() (although, again not enforced) > that it supports even fewer bits for RMID > > IA32_QM_EVTSEL.RMID (bits 41:32) are configured with valid RMID > > Looks like after this patch there are quite a few different field widths for RMID > between what is documented, used directly, and actually enforced. > To add to this it looks like PLZA currently supports 12 bit RMIDs per https://lore.kernel.org/lkml/702b88901bc62f07829144a96cc887471b427da8.1787772750.git.babu.moger@amd.com/ I assume this field will also be updated to 15 bits? Reinette