From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.13]) (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 7DA982EBB9E for ; Wed, 10 Dec 2025 23:15:25 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=192.198.163.13 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1765408538; cv=none; b=EwdjUSHOmnKCFuauII2dTeHwfPszQ3zpUBKnoeti+0k5sO3y6wsLT9wfXgXzyr6/7Dj6YsJ56x9QSpjsOOy8nzc4eHA0C9XA7/+qPvWBFNCdZJtHVPb1XFVmFdSre8uMVsogSw3Av3V0Ibxcq77XkXMcvwsJtw90kf9qnENJbRY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1765408538; c=relaxed/simple; bh=mdPSsXNAF+ChB2cevDfLFY2DwPCA14rHNG70ozRiqTE=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=iCdE4AS6/IOcfUbIo/dwauZ9PDumZZ0nMCb6Lcu2x+M5T+OBuG67sPXspvs3SWTXC8vHL3r5zPNr+mcqHKGoTOEIPK2x4+/264TC+gjrdAmNZX097zgZDlbJ/M9lqO+8LITAFQfYamqFLzB/FlO0dw1JdPGmuXShFXuOQ//A9fo= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com; spf=pass smtp.mailfrom=intel.com; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b=ABpZ+drs; arc=none smtp.client-ip=192.198.163.13 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com Authentication-Results: smtp.subspace.kernel.org; spf=pass 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="ABpZ+drs" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1765408529; x=1796944529; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=mdPSsXNAF+ChB2cevDfLFY2DwPCA14rHNG70ozRiqTE=; b=ABpZ+drsjFrGCyChm9reHPxdag1Uzpa2qCgEMnWc35+yL7/66KaqJfvl hkP+oYvRg8IRIhfvE9oJRZKd3+tURv9ysOOWLO1Mp+IT09FFOZtG7RAYH VKAmMKXzx7iwaKkhOedyQ4FjcaQ0FaA/6I6KHeBmxgorr47iBmY6xGgxE Alf2AxdMyraoU7zXMOzSpwFlpMyW5SafHX+vZN8I0XR0I3Jc1KXRsFXvP ZCoRFv2AvGqzOXe6ZYBu54F4zfJBN/tXD4sdZYlq9twTZy3su39nd79uY Vg5P6mBVi3mQCc4eEabvBLDWviEFr6S0H79hig6gPVdDLDxChbHqkXgpr w==; X-CSE-ConnectionGUID: tQuGlCweSaGOa7Yiu9YqjQ== X-CSE-MsgGUID: htMQxm3+RBeQsVRl7fcyzw== X-IronPort-AV: E=McAfee;i="6800,10657,11638"; a="69973715" X-IronPort-AV: E=Sophos;i="6.20,265,1758610800"; d="scan'208";a="69973715" Received: from orviesa002.jf.intel.com ([10.64.159.142]) by fmvoesa107.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 10 Dec 2025 15:14:44 -0800 X-CSE-ConnectionGUID: ALEXaJlrRmWip92vLRTi0w== X-CSE-MsgGUID: ba8T8sJ0ReSl4y0KBqrqwA== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.20,265,1758610800"; d="scan'208";a="227297161" Received: from daliomra-mobl3.amr.corp.intel.com (HELO agluck-desk3.intel.com) ([10.124.221.254]) by orviesa002-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 10 Dec 2025 15:14:43 -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 v16 29/32] x86/resctrl: Enable RDT_RESOURCE_PERF_PKG Date: Wed, 10 Dec 2025 15:14:08 -0800 Message-ID: <20251210231413.59102-30-tony.luck@intel.com> X-Mailer: git-send-email 2.51.1 In-Reply-To: <20251210231413.59102-1-tony.luck@intel.com> References: <20251210231413.59102-1-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 34f882df1243..ea613e49d213 100644 --- a/arch/x86/kernel/cpu/resctrl/intel_aet.c +++ b/arch/x86/kernel/cpu/resctrl/intel_aet.c @@ -275,6 +275,12 @@ 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; } -- 2.51.1