From nobody Sun Dec 14 23:39:09 2025 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: 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 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, 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 2.51.1