From nobody Fri Dec 19 03:44:54 2025 Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.9]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 65476349B16 for ; Wed, 17 Dec 2025 17:22:13 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.175.65.9 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1765992146; cv=none; b=oKxaLlY+9xeWEQYsicaWH47x5mKv3dM0T6jDoqIopXmjTlt4JPXPQHoXILjPkd34dTSk51lJX2fCBtfAZ7+thXaxJk8z/jzv+/3qlAYV4vTTGzwxhGmgrwYIGH+mmYF79Qe5Ls8PiKSFwT/d0cTiXdmxlsWr5bLeuR6DroVvcPk= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1765992146; c=relaxed/simple; bh=3T+3GdPWPdVUudxsmnM1Op9vEPGDyJqPwOAUZ1+e2MM=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=pZUeKU82JQmmSHWe4WUB+UN2EeQ6S4OJcrBXoW7YEMankQ+98bjNwvLMyxGRjvU507qSh1oLkF5RVilTGU45iiHz5WE8vIaH0BF8KR7kT8CSvA0fzt2fFGc2OyhP6qEjbKDRL6TSpZEMK1qvScYceVtkHAXVCuSae2b7+i6BLpc= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com; spf=fail smtp.mailfrom=intel.com; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b=Z8iHfR4M; arc=none smtp.client-ip=198.175.65.9 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com Authentication-Results: smtp.subspace.kernel.org; spf=fail smtp.mailfrom=intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="Z8iHfR4M" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1765992135; x=1797528135; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=3T+3GdPWPdVUudxsmnM1Op9vEPGDyJqPwOAUZ1+e2MM=; b=Z8iHfR4Mh+U15TiibG50eLGg9ZPGNhmfuE5Jw15pPnwVqraz34Lh8Zq9 aH6CACduxTtai7EGG24Hqy5M1pB+RmsQ6nQKD7haTINU0Z4DdXoj8YBje 0vzcP3m05siTN45HxvGDMjF1jHcsH+lG60ISYXTS8aI9rcAdNE8XkHaS6 LOB72zOJgqKq4WYw3jPFq9Iu7FYmwToCSM2MqPFlDKLYbVAy6MreYEZux TBkBbCmNLSKF+BCLU0GEFUH3sU/6RUu1pkairZMLx+onGjCvQKekdMwnh Cc1ySQEdH3Lapa3D/DwBEc3V0dk4JjM3m3nvBzTc6fYF1zUvAZ14N04Za A==; X-CSE-ConnectionGUID: eSR36zC2RAinaskGVqQ2FQ== X-CSE-MsgGUID: bYiEEn0kRvKYAEnz8x0ydA== X-IronPort-AV: E=McAfee;i="6800,10657,11645"; a="90594787" X-IronPort-AV: E=Sophos;i="6.21,156,1763452800"; d="scan'208";a="90594787" Received: from fmviesa002.fm.intel.com ([10.60.135.142]) by orvoesa101.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 17 Dec 2025 09:21:36 -0800 X-CSE-ConnectionGUID: Pl772OdzRqqh2pqbfM78bQ== X-CSE-MsgGUID: a2pU47crT+mDKebXo3JeOw== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.21,156,1763452800"; d="scan'208";a="221748231" Received: from pgcooper-mobl3.ger.corp.intel.com (HELO agluck-desk3.home.arpa) ([10.124.223.131]) by fmviesa002-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 17 Dec 2025 09:21:35 -0800 From: Tony Luck To: Fenghua Yu , Reinette Chatre , Maciej Wieczor-Retman , Peter Newman , James Morse , Babu Moger , Drew Fustini , Dave Martin , Chen Yu Cc: x86@kernel.org, linux-kernel@vger.kernel.org, patches@lists.linux.dev, Tony Luck Subject: [PATCH v17 20/32] x86/resctrl: Read telemetry events Date: Wed, 17 Dec 2025 09:21:07 -0800 Message-ID: <20251217172121.12030-21-tony.luck@intel.com> X-Mailer: git-send-email 2.52.0 In-Reply-To: <20251217172121.12030-1-tony.luck@intel.com> References: <20251217172121.12030-1-tony.luck@intel.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Introduce intel_aet_read_event() to read telemetry events for resource RDT_RESOURCE_PERF_PKG. There may be multiple aggregators tracking each pack= age, so scan all of them and add up all counters. Aggregators may return an inva= lid data indication if they have received no records for a given RMID. User will see "Unavailable" if none of the aggregators on a package provide valid cou= nts. Resctrl now uses readq() so depends on X86_64. Update Kconfig. Signed-off-by: Tony Luck Reviewed-by: Reinette Chatre --- arch/x86/kernel/cpu/resctrl/internal.h | 5 +++ arch/x86/kernel/cpu/resctrl/intel_aet.c | 51 +++++++++++++++++++++++++ arch/x86/kernel/cpu/resctrl/monitor.c | 4 ++ fs/resctrl/monitor.c | 14 +++++++ arch/x86/Kconfig | 2 +- 5 files changed, 75 insertions(+), 1 deletion(-) diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/r= esctrl/internal.h index f2e6e3577df0..10743f5d5fd4 100644 --- a/arch/x86/kernel/cpu/resctrl/internal.h +++ b/arch/x86/kernel/cpu/resctrl/internal.h @@ -225,9 +225,14 @@ void resctrl_arch_mbm_cntr_assign_set_one(struct rdt_r= esource *r); #ifdef CONFIG_X86_CPU_RESCTRL_INTEL_AET bool intel_aet_get_events(void); void __exit intel_aet_exit(void); +int intel_aet_read_event(int domid, u32 rmid, void *arch_priv, u64 *val); #else static inline bool intel_aet_get_events(void) { return false; } static inline void __exit intel_aet_exit(void) { } +static inline int intel_aet_read_event(int domid, u32 rmid, void *arch_pri= v, u64 *val) +{ + return -EINVAL; +} #endif =20 #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 611c6b1fc08d..38985613d4be 100644 --- a/arch/x86/kernel/cpu/resctrl/intel_aet.c +++ b/arch/x86/kernel/cpu/resctrl/intel_aet.c @@ -11,11 +11,15 @@ =20 #define pr_fmt(fmt) "resctrl: " fmt =20 +#include #include +#include #include +#include #include #include #include +#include #include #include #include @@ -236,3 +240,50 @@ void __exit intel_aet_exit(void) } } } + +#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). If an aggregator hasn't received any data for a specific RMID, + * the MMIO read indicates that data is not valid. Return success if at + * least one aggregator has valid data. + */ +int intel_aet_read_event(int domid, u32 rmid, void *arch_priv, u64 *val) +{ + struct pmt_event *pevt =3D arch_priv; + struct event_group *e; + bool valid =3D false; + u64 total =3D 0; + u64 evtcount; + void *pevt0; + u32 idx; + + pevt0 =3D pevt - pevt->idx; + e =3D container_of(pevt0, struct event_group, evts); + idx =3D rmid * e->num_events; + idx +=3D pevt->idx; + + if (idx * sizeof(u64) + sizeof(u64) > e->mmio_size) { + pr_warn_once("MMIO index %u out of range\n", idx); + return -EIO; + } + + for (int i =3D 0; i < e->pfg->count; i++) { + if (!e->pfg->regions[i].addr) + continue; + if (e->pfg->regions[i].plat_info.package_id !=3D domid) + continue; + evtcount =3D readq(e->pfg->regions[i].addr + idx * sizeof(u64)); + if (!(evtcount & DATA_VALID)) + continue; + total +=3D evtcount & DATA_BITS; + valid =3D true; + } + + if (valid) + *val =3D total; + + return valid ? 0 : -EINVAL; +} diff --git a/arch/x86/kernel/cpu/resctrl/monitor.c b/arch/x86/kernel/cpu/re= sctrl/monitor.c index 6929614ba6e6..e6a154240b8d 100644 --- a/arch/x86/kernel/cpu/resctrl/monitor.c +++ b/arch/x86/kernel/cpu/resctrl/monitor.c @@ -251,6 +251,10 @@ int resctrl_arch_rmid_read(struct rdt_resource *r, str= uct rdt_domain_hdr *hdr, int ret; =20 resctrl_arch_rmid_read_context_check(); + + if (r->rid =3D=3D RDT_RESOURCE_PERF_PKG) + return intel_aet_read_event(hdr->id, rmid, arch_priv, val); + if (!domain_header_is_valid(hdr, RESCTRL_MON_DOMAIN, RDT_RESOURCE_L3)) return -EINVAL; =20 diff --git a/fs/resctrl/monitor.c b/fs/resctrl/monitor.c index 9af08b673e39..8a4c2ae72740 100644 --- a/fs/resctrl/monitor.c +++ b/fs/resctrl/monitor.c @@ -527,6 +527,20 @@ static int __mon_event_count(struct rdtgroup *rdtgrp, = struct rmid_read *rr) return __l3_mon_event_count(rdtgrp, rr); else return __l3_mon_event_count_sum(rdtgrp, rr); + case RDT_RESOURCE_PERF_PKG: { + u64 tval =3D 0; + + rr->err =3D resctrl_arch_rmid_read(rr->r, rr->hdr, rdtgrp->closid, + rdtgrp->mon.rmid, rr->evt->evtid, + rr->evt->arch_priv, + &tval, rr->arch_mon_ctx); + if (rr->err) + return rr->err; + + rr->val +=3D tval; + + return 0; + } default: rr->err =3D -EINVAL; return -EINVAL; diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index 0d874a92daed..c25ea0f139ca 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -542,7 +542,7 @@ config X86_CPU_RESCTRL =20 config X86_CPU_RESCTRL_INTEL_AET bool "Intel Application Energy Telemetry" - depends on X86_CPU_RESCTRL && CPU_SUP_INTEL && INTEL_PMT_TELEMETRY=3Dy &&= INTEL_TPMI=3Dy + depends on X86_64 && X86_CPU_RESCTRL && CPU_SUP_INTEL && INTEL_PMT_TELEME= TRY=3Dy && INTEL_TPMI=3Dy help Enable per-RMID telemetry events in resctrl. =20 --=20 2.52.0