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Wed, 9 Jul 2025 15:48:49 +0000 Message-ID: <37708e34-9634-4488-aeb7-6a61ab01947a@intel.com> Date: Wed, 9 Jul 2025 08:48:47 -0700 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v6 22/30] x86/resctrl: Read core telemetry events To: Tony Luck , Fenghua Yu , "Maciej Wieczor-Retman" , Peter Newman , James Morse , Babu Moger , Drew Fustini , Dave Martin , Anil Keshavamurthy , Chen Yu CC: , , References: <20250626164941.106341-1-tony.luck@intel.com> <20250626164941.106341-23-tony.luck@intel.com> From: Reinette Chatre Content-Language: en-US In-Reply-To: <20250626164941.106341-23-tony.luck@intel.com> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit X-ClientProxiedBy: MW4PR03CA0229.namprd03.prod.outlook.com (2603:10b6:303:b9::24) To SJ2PR11MB7573.namprd11.prod.outlook.com (2603:10b6:a03:4d2::10) 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: SJ2PR11MB7573:EE_|CO1PR11MB4947:EE_ X-MS-Office365-Filtering-Correlation-Id: 1ed7c3af-c23c-4293-6f03-08ddbf0018ba X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|366016|376014|921020; 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On 6/26/25 9:49 AM, Tony Luck wrote: > The resctrl file system passes requests to read event monitor files to > the architecture resctrl_arch_rmid_read() to collect values > from hardware counters. > > Use the resctrl resource to differentiate between calls to read legacy > L3 events from the new telemetry events (which are attached to > RDT_RESOURCE_PERF_PKG). > > There may be multiple aggregators tracking each package, so scan all of > them and add up all counters. > > Enable the events marked as readable from any CPU providing an > mon_evt::arch_priv pointer to the struct pmt_event for each > event. > > At run time when a user reads an event file the file system code > provides the enum resctrl_event_id for the event and the arch_priv > pointer that was supplied when the event was enabled. > > Resctrl now uses readq() so depends on X86_64. Update Kconfig. > > Signed-off-by: Tony Luck > --- > arch/x86/kernel/cpu/resctrl/internal.h | 2 ++ > arch/x86/kernel/cpu/resctrl/intel_aet.c | 46 +++++++++++++++++++++++++ > arch/x86/kernel/cpu/resctrl/monitor.c | 3 ++ > arch/x86/Kconfig | 2 +- > 4 files changed, 52 insertions(+), 1 deletion(-) > > diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/resctrl/internal.h > index e93b15bf6aab..e8d2a754bc0c 100644 > --- a/arch/x86/kernel/cpu/resctrl/internal.h > +++ b/arch/x86/kernel/cpu/resctrl/internal.h > @@ -171,5 +171,7 @@ void rdt_domain_reconfigure_cdp(struct rdt_resource *r); > > bool intel_aet_get_events(void); > void __exit intel_aet_exit(void); > +int intel_aet_read_event(int domid, int rmid, enum resctrl_event_id evtid, > + void *arch_priv, u64 *val); > > #endif /* _ASM_X86_RESCTRL_INTERNAL_H */ > diff --git a/arch/x86/kernel/cpu/resctrl/intel_aet.c b/arch/x86/kernel/cpu/resctrl/intel_aet.c > index f9b2959693a0..10fd8b04105e 100644 > --- a/arch/x86/kernel/cpu/resctrl/intel_aet.c > +++ b/arch/x86/kernel/cpu/resctrl/intel_aet.c > @@ -14,6 +14,7 @@ > #include > #include > #include > +#include > #include > #include > > @@ -206,6 +207,13 @@ static int configure_events(struct event_group *e, struct pmt_feature_group *p) > } > e->pkginfo = no_free_ptr(pkginfo); > > + for (int i = 0; i < e->num_events; i++) { > + enum resctrl_event_id eventid; > + > + eventid = e->evts[i].id; > + resctrl_enable_mon_event(eventid, true, e->evts[i].bin_bits, &e->evts[i]); > + } > + > return 0; > } > > @@ -268,3 +276,41 @@ void __exit intel_aet_exit(void) > free_mmio_info((*peg)->pkginfo); > } > } > + > +#define DATA_VALID BIT_ULL(63) > +#define DATA_BITS GENMASK_ULL(62, 0) > + > +/* > + * Read counter for an event on a domain (summing all aggregators > + * on the domain). > + */ > +int intel_aet_read_event(int domid, int rmid, enum resctrl_event_id eventid, > + void *arch_priv, u64 *val) > +{ > + struct pmt_event *pevt = arch_priv; > + struct mmio_info *mmi; > + struct event_group *e; > + u64 evtcount; > + void *pevt0; Should this be a struct pmt_event *? > + int idx; > + > + pevt0 = pevt - pevt->idx; > + e = container_of(pevt0, struct event_group, evts); > + idx = rmid * e->num_events; > + idx += pevt->idx; > + mmi = e->pkginfo[domid]; > + > + if (idx * sizeof(u64) + sizeof(u64) > e->mmio_size) { > + pr_warn_once("MMIO index %d out of range\n", idx); > + return -EIO; > + } > + > + for (int i = 0; i < mmi->num_regions; i++) { > + evtcount = readq(mmi->addrs[i] + idx * sizeof(u64)); > + if (!(evtcount & DATA_VALID)) > + return -EINVAL; > + *val += evtcount & DATA_BITS; > + } > + > + return 0; > +} > diff --git a/arch/x86/kernel/cpu/resctrl/monitor.c b/arch/x86/kernel/cpu/resctrl/monitor.c > index 185b203f6321..51d7d99336c6 100644 > --- a/arch/x86/kernel/cpu/resctrl/monitor.c > +++ b/arch/x86/kernel/cpu/resctrl/monitor.c > @@ -232,6 +232,9 @@ int resctrl_arch_rmid_read(struct rdt_resource *r, struct rdt_domain_hdr *hdr, > > resctrl_arch_rmid_read_context_check(); > > + if (r->rid == RDT_RESOURCE_PERF_PKG) > + return intel_aet_read_event(hdr->id, rmid, eventid, arch_priv, val); > + > if (r->rid != RDT_RESOURCE_L3) > return -EINVAL; > This part looks good to me. I expect Kconfig part to look different next time. Reinette