From nobody Mon Feb 9 12:01:51 2026 Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.12]) (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 2469C3570B5 for ; Wed, 29 Oct 2025 16:21:48 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.175.65.12 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1761754910; cv=none; b=czElENfa/LLA9qKRceL93T/uA+kIaGPjInr6+xGNhJXgxc2Uh7MlmQY3kTWMrWsZlWoqFHoM7zfzJF4rYHVEJo/DNpjaLBpo138j8d2aIuXH1qvPyRVidoPA68yp6kauYAFWtx9QhWXi+qmAa//xnkAkIJLaYjqxVdT1GIT1yhY= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1761754910; c=relaxed/simple; bh=L3bnERHte5K3EQEQaQOEGgTPYtoNGtXVw5Rfevci4qo=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=FhKIivlN0DkqErRVVDS3+HfjtTufNatZ4daT6eqXm+xs6KLlYVY4Wetg6gO9Y2VmzyR2vI/dYr/fD2AjvX829Slp39CQIZSKi/GNEU/uycEk6LdgG1Nyadw6DHqZypxgL62WVcoQ+UuOBpU0lrBFTqKGtRvGOYqBknthQSnAdEk= 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=NW+XK19O; arc=none smtp.client-ip=198.175.65.12 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="NW+XK19O" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1761754908; x=1793290908; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=L3bnERHte5K3EQEQaQOEGgTPYtoNGtXVw5Rfevci4qo=; b=NW+XK19ON+DV589SEyptT8pGDqnBsFnjRA59Q9SPdyOKJC2bkSw0wSQV KpbQjtq5EcEADH1IpiKmkMGGDhowZbk3xHznpoFjFpDVpVgz+6Eh+3VyY 6OOdvgC0xoGLpTL6BgSSmhtzWoBc4UYkReKg51kNARSo7sSluARoZ3qEX KyRX2+2rOXpCJbzSQxfbW2ZOTG1rz1925yfsXvb1F2Lxu32OKSudSC1mI PoExd5Imal4wgwSQBWEsv1i96NzlUgFKdBFrjDpmlW8DqJl6g+fTGW5kJ nSWNWOzO304xfBwRW3yWkFo/09AedSDvXAZbqvtOTTuIHvyo1WT6t2nZe A==; X-CSE-ConnectionGUID: zHRAOku5QW+vuD9bnY9XWA== X-CSE-MsgGUID: nnVD0NkdQKWl28s6E5y+/g== X-IronPort-AV: E=McAfee;i="6800,10657,11597"; a="75331049" X-IronPort-AV: E=Sophos;i="6.19,264,1754982000"; d="scan'208";a="75331049" Received: from orviesa006.jf.intel.com ([10.64.159.146]) by orvoesa104.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 29 Oct 2025 09:21:36 -0700 X-CSE-ConnectionGUID: Wadt/yhSQ1ug70ZB7/ubKg== X-CSE-MsgGUID: mFwODwc4QGi/z+qyoQUvcw== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.19,264,1754982000"; d="scan'208";a="184901413" Received: from mgerlach-mobl1.amr.corp.intel.com (HELO agluck-desk3.home.arpa) ([10.124.223.146]) by orviesa006-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 29 Oct 2025 09:21:36 -0700 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 v13 29/32] x86/resctrl: Enable RDT_RESOURCE_PERF_PKG Date: Wed, 29 Oct 2025 09:21:12 -0700 Message-ID: <20251029162118.40604-30-tony.luck@intel.com> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20251029162118.40604-1-tony.luck@intel.com> References: <20251029162118.40604-1-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 | 2 ++ 2 files changed, 17 insertions(+), 1 deletion(-) diff --git a/arch/x86/kernel/cpu/resctrl/core.c b/arch/x86/kernel/cpu/resct= rl/core.c index 9eb1bca9436b..7a9c7e6ad712 100644 --- a/arch/x86/kernel/cpu/resctrl/core.c +++ b/arch/x86/kernel/cpu/resctrl/core.c @@ -761,14 +761,28 @@ 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 252a3fd4260c..2f4f8fb317d7 100644 --- a/arch/x86/kernel/cpu/resctrl/intel_aet.c +++ b/arch/x86/kernel/cpu/resctrl/intel_aet.c @@ -238,6 +238,8 @@ static bool enable_events(struct event_group *e, struct= pmt_feature_group *p) resctrl_enable_mon_event(e->evts[j].id, true, e->evts[j].bin_bits, &e->evts[j]); =20 + pr_info("%s %s monitoring detected\n", r->name, e->name); + return true; } =20 --=20 2.51.0