From mboxrd@z Thu Jan 1 00:00:00 1970 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: 8bit Since telemetry events are enumerated on resctrl mount the RDT_RESOURCE_PERF_PKG resource is not considered "monitoring capable" during early resctrl initialization. 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 resctrl initialization. Mark the RDT_RESOURCE_PERF_PKG as "monitoring capable" upon successful telemetry 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/resctrl/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) void resctrl_arch_pre_mount(void) { + struct rdt_resource *r = &rdt_resources_all[RDT_RESOURCE_PERF_PKG].r_resctrl; static atomic_t only_once = ATOMIC_INIT(0); - int old = 0; + int cpu, old = 0; if (!atomic_try_cmpxchg(&only_once, &old, 1)) return; 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 = true; + rdt_mon_capable = true; + for_each_online_cpu(cpu) + domain_add_cpu_mon(cpu, r); + mutex_unlock(&domain_list_lock); + cpus_read_unlock(); } 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, struct pmt_feature_group *p) else r->mon.num_rmid = e->num_rmid; + 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; } -- 2.52.0