From nobody Tue Dec 2 00:46:17 2025 Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.11]) (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 743FC327C0D for ; Mon, 24 Nov 2025 18:55:13 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=192.198.163.11 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1764010515; cv=none; b=UDF5hjSPOoshwVi8Kbov+YOapKO2sO0gz3EQVdl7xezcBWbRPI+X01J+b4sVrhih0dp1zdirLpsDmLR4qw1TaB9Gmv6uVsQ1uP+ixFFF97FXSujIbIMSc/421UE7bmMAFC3t35Np6KKTYI6g67PeHasBNZGF2lJjuy6rS0ZhyXU= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1764010515; c=relaxed/simple; bh=ktuSk2wMgmJMK50ZK4GLeGxWbH7w+Yr81xrVxNRhnWs=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=Gku0cmLeWd6q1nARsz+P/DO+Xb9zLJgG7YOy3J7tPcJMgI8pmOJyoYsN5JtmtcyGWzoi47/V9FZvpZt4uoYLLzLV0BS/IwSnzFxZp16zsrE8l2oTp6ZtEzTaw503lGO+a9TUfSk4/7RjnfviwSC3jpFbI9dMLmwmQbHtmyYYEKU= 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=IAcnS23q; arc=none smtp.client-ip=192.198.163.11 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="IAcnS23q" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1764010513; x=1795546513; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=ktuSk2wMgmJMK50ZK4GLeGxWbH7w+Yr81xrVxNRhnWs=; b=IAcnS23qsi1V2PXSR2d5EmTv1zBjpgFVnPAzo8axRTXWbrTYC55U2wBO ueOVY+xTZgA99ejW7HfFJt3pEifluQnaAGtlyehMbjjsRXO06vLGa7209 NdMfIcrjugfActWSkCt2I00RQdXUhPa66xcRj1+e4lGVQjopy+WgoFdv1 Y6+L7sSq4PWNsUwqG80Sq2UskGjZMa1z7+PsGznGTY5zLLI/PhqrXLmXg cZwjWZdK86crCnSxLSg5JKubKX3X1MlMMCuSUqmq7/BfLFIPHvUM7ldvL Bjn43xdWJA11yTEFvFmyNv/z5hn8AOAhoPS59e5Js/CdPwZf5sU1F9wQe Q==; X-CSE-ConnectionGUID: idfUhOb9QCaw9NBWE8EhiA== X-CSE-MsgGUID: GvIZvy2HTxuWlk+joUMItw== X-IronPort-AV: E=McAfee;i="6800,10657,11623"; a="76636939" X-IronPort-AV: E=Sophos;i="6.20,223,1758610800"; d="scan'208";a="76636939" Received: from orviesa009.jf.intel.com ([10.64.159.149]) by fmvoesa105.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 24 Nov 2025 10:54:32 -0800 X-CSE-ConnectionGUID: KQ9Pgc8XTwWqTDBrc5q1RA== X-CSE-MsgGUID: KOBCkZbVRamLT94qatBzsw== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.20,223,1758610800"; d="scan'208";a="192225041" Received: from rfrazer-mobl3.amr.corp.intel.com (HELO agluck-desk3.home.arpa) ([10.124.222.153]) by orviesa009-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 24 Nov 2025 10:54:32 -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 v14 29/32] x86/resctrl: Enable RDT_RESOURCE_PERF_PKG Date: Mon, 24 Nov 2025 10:54:06 -0800 Message-ID: <20251124185412.24155-30-tony.luck@intel.com> X-Mailer: git-send-email 2.51.1 In-Reply-To: <20251124185412.24155-1-tony.luck@intel.com> References: <20251124185412.24155-1-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 6eff606541ad..83d0bab4d6f5 100644 --- a/arch/x86/kernel/cpu/resctrl/intel_aet.c +++ b/arch/x86/kernel/cpu/resctrl/intel_aet.c @@ -280,6 +280,12 @@ 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->name, e->guid, skipped_events); + else + pr_info("%s %s:0x%x monitoring detected\n", r->name, e->name, e->guid); + return true; } =20 --=20 2.51.1