From nobody Fri Dec 19 03:46:19 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 CFEDB30F7F2 for ; Wed, 17 Dec 2025 17:22:31 +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=1765992161; cv=none; b=s1SLMgn8CF/HW7Zflj8KDnP2lRU0wglFGv0v4KcFqkLqzp7kwxf+G+P//GvMF207wBtcO7KVnD8EmNAESkV24kDrpX8vCF2OHClA+CcEq5Cs3DPto4aKFk4g5pAmcLo188PdvvJluh6VttK/NfTjRzoHMm8CbhO59Z4zicgPQiA= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1765992161; c=relaxed/simple; bh=zY4ixyPA16TWiCZD68LwvScC7FiX9KzB26LzSNsOUjU=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=CGO0Ye6fb2Kv4TT/0/FCymnF+Zn6qkzBkIbNSFxXgRU84PJMuVl0TMPLlc1/W56KLLc5LJpCvB23QcajUi8JLoQFQBMI/iV5wtAVTJNgRLYNF7Sv9jKMzdnfxAmwHI7WaLi9sAep3T4N3F1Tqp6lwdYmuBI4cGKO6APHaPzPgh0= 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=OpkLmBQJ; 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="OpkLmBQJ" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1765992152; x=1797528152; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=zY4ixyPA16TWiCZD68LwvScC7FiX9KzB26LzSNsOUjU=; b=OpkLmBQJSLyNTB69ti363tpJaKmkEEhkPt1H8H+1FDLcjm3vAYyJnsiy wV5mTi5CNZHwhwmW35aNM+Bh4xpwuTTvZN+eB9EDblIyM49B0XB2Vi5Af EKCAvxM9oPaeTdZWe2CSgl29S2JZmxozvT8UL683Y+P/+JefXZVUXhNLY hfPh5GYH7D5DEPg39k82tHo1JGf83ytSi5gcnolT+kAg4gcW0vXMtFkMN /q9c0b67Ra2HCL0ZX7IPJrq/MXwxXlZv1c3uDPcBEeef88wuvoNpXqPxx 5trDJ+8ZROPa1k1EEVnXeGjeupnN4/hY/9XXJeWBEQLuo4/A8Wl99JlSN g==; X-CSE-ConnectionGUID: YJcWSRpTR6ucKPtsfsMCCw== X-CSE-MsgGUID: JXvEZ0ZJRcmVSr7blzdRlw== X-IronPort-AV: E=McAfee;i="6800,10657,11645"; a="90594865" X-IronPort-AV: E=Sophos;i="6.21,156,1763452800"; d="scan'208";a="90594865" 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 09:21:38 -0800 X-CSE-ConnectionGUID: gFA6Qi6JTUW5sDm0F4ScIw== X-CSE-MsgGUID: GHXXFbRWQEW5wByPgMPWZg== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.21,156,1763452800"; d="scan'208";a="221748274" 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 09:21:37 -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 29/32] x86/resctrl: Enable RDT_RESOURCE_PERF_PKG Date: Wed, 17 Dec 2025 09:21:16 -0800 Message-ID: <20251217172121.12030-30-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" Since telemetry events are enumerated on resctrl mount the RDT_RESOURCE_PER= F_PKG resource is not considered "monitoring capable" during early resctrl initia= lization. This means that the domain list for RDT_RESOURCE_PERF_PKG is not built when= the CPU hot plug notifiers are registered and run for the first time right after re= sctrl initialization. Mark the RDT_RESOURCE_PERF_PKG as "monitoring capable" upon successful tele= metry event enumeration to ensure future CPU hotplug events include this resource= and initialize its domain list for CPUs that are already online. Print to console log announcing the name of the telemetry feature detected. Signed-off-by: Tony Luck Reviewed-by: Reinette Chatre --- arch/x86/kernel/cpu/resctrl/core.c | 16 +++++++++++++++- arch/x86/kernel/cpu/resctrl/intel_aet.c | 6 ++++++ 2 files changed, 21 insertions(+), 1 deletion(-) diff --git a/arch/x86/kernel/cpu/resctrl/core.c b/arch/x86/kernel/cpu/resct= rl/core.c index bca65851d592..829633bc54e5 100644 --- a/arch/x86/kernel/cpu/resctrl/core.c +++ b/arch/x86/kernel/cpu/resctrl/core.c @@ -766,14 +766,28 @@ static int resctrl_arch_offline_cpu(unsigned int cpu) =20 void resctrl_arch_pre_mount(void) { + struct rdt_resource *r =3D &rdt_resources_all[RDT_RESOURCE_PERF_PKG].r_re= sctrl; static atomic_t only_once =3D ATOMIC_INIT(0); - int old =3D 0; + int cpu, old =3D 0; =20 if (!atomic_try_cmpxchg(&only_once, &old, 1)) return; =20 if (!intel_aet_get_events()) return; + + /* + * Late discovery of telemetry events means the domains for the + * resource were not built. Do that now. + */ + cpus_read_lock(); + mutex_lock(&domain_list_lock); + r->mon_capable =3D true; + rdt_mon_capable =3D true; + for_each_online_cpu(cpu) + domain_add_cpu_mon(cpu, r); + mutex_unlock(&domain_list_lock); + cpus_read_unlock(); } =20 enum { diff --git a/arch/x86/kernel/cpu/resctrl/intel_aet.c b/arch/x86/kernel/cpu/= resctrl/intel_aet.c index e50c04afc8eb..3ee51b05a297 100644 --- a/arch/x86/kernel/cpu/resctrl/intel_aet.c +++ b/arch/x86/kernel/cpu/resctrl/intel_aet.c @@ -274,6 +274,12 @@ static bool enable_events(struct event_group *e, struc= t pmt_feature_group *p) else r->mon.num_rmid =3D e->num_rmid; =20 + if (skipped_events) + pr_info("%s %s:0x%x monitoring detected (skipped %d events)\n", r->name, + e->pfname, e->guid, skipped_events); + else + pr_info("%s %s:0x%x monitoring detected\n", r->name, e->pfname, e->guid); + return true; } =20 --=20 2.52.0