From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=192.198.163.11 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1793740992; b=0I4YvGbN1TcIjLZcGkt9PPvg2SiDC0rdZJLM+BbJF8ECIn74hkVTa00cWAiE7uZfJGyc F7qfnir9i4BDzSGE9i8H54P6jO2OpbtMPO9hCwUwGY9hNdL6z0fFMWoq5atGDUcEXUFZ2 TREwCQIbpFlgBYv6GlIv969knO1+Mg1EJbNBfGrs5v9De10LPDdqsFNhqM5mRm5qyTKZu qZb49p7qmpslcZqUz2DawZEgeum80wGXl8Bant0ZuWzBIxo1iPbd/AUn3rdrMfePk6zEI ETIU5hUzepD2Qy/jyryWEpuFSfiH/kvG6/pU2eVrbzR9AdpQmGtBKNkbSlcsqxeUF/w== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1793740992; h=DMARC-Filter:DKIM-Signature:X-CSE-ConnectionGUID:X-CSE-MsgGUID: X-IronPort-AV:X-IronPort-AV:Received:X-CSE-ConnectionGUID: X-CSE-MsgGUID:X-ExtLoop1:X-IronPort-AV:Received:From:To:Cc:Subject: Date:Message-ID:X-Mailer:In-Reply-To:References:MIME-Version: Content-Transfer-Encoding; bh=fwJS2tr1Rxb89A2TFS7+CmwlHzGipvKA6NK3QGClmVg=; b=RbfX8IeXdfBuRyISASlJ9fWKOaG3htOizBUZ1Qzf/905abeP5ZRhSrtSAxNZsLrZxqac vU7qDI19PiNr+OEJfITMazSiymXCKGU3fCXMuZQdr9AR72UjHjv4OChfZrspkAedhm2T5 gHzFNhf+iIdY6VSO126o/zhuA+bSKRQ/P4rzoJzCgJg1jFk005qs1NdJW/2PX6wj/3l3H FSF/jEXaPqvccbejpPIF36VKQj9Tfto5794+1jWrugok0kh4FqVn+3C1Obf+Gm385X3BB oi7HXJgJJjSzUZzuqayQ2tL720T7VRUZrmVtGcbTVbpR61RvtpwImljtGxvMgbSquEg== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass header.from=intel.com; spf=pass smtp.mailfrom=intel.com; dkim=pass header.d=intel.com header.i=@intel.com header.a=rsa-sha256 header.s=Intel header.b=LfTyP40c; arc=none smtp.remote-ip=192.198.163.11 Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.11]) (using TLSv1.2 with cipher ECDHE-ECDSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id BB09C606A31B for ; Tue, 3 Nov 2026 21:23:10 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.2 smtp.subspace.kernel.org BB09C606A31B 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, unprotected) header.d=intel.com header.i=@intel.com header.a=rsa-sha256 header.s=Intel header.b=LfTyP40c DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1793740991; x=1825276991; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=5fsFBAMfv8hiL1Az+0v+EZko0qrMcQRRQnWCy199kIo=; b=LfTyP40cq8bK6Pc/R+isagMnV2rRt8UmceySfW2A+vFqTTPl5I8v2Ves jkqwhMxEc7KvpIFSn5aRO7/nD4gU7DDWe22ebnsHhcBl13wO9PANqx1MD XLVs1svKNKhY3qt/p5+G4NPHlRJtmFTS3FzS6TGRozgCNu3nw5AbDwj7g zJ3Hzwr/bSu0f/Xx7jZOFxDKDyGod2ndKRKt2UgRKjEUxyC9x3v8fgIzy lLZGvyJE8grNKqf84qcqxIIohe+miiyquwpCmzuurxlK21FxH17fRTkWz 1glYguertXmC/YOlrgtejCUR4zeO3NYfPWFsDd8aKXN0/pUz0ZR0Fvtav A==; X-CSE-ConnectionGUID: +Vu6tR+TR/qRLmL74z8q3g== X-CSE-MsgGUID: +OsIwmxJQCe3jxy/+TE4dw== X-IronPort-AV: E=McAfee;i="6800,10657,11955"; a="2393462" X-IronPort-AV: E=Sophos;i="6.27,193,1787036400"; d="scan'208";a="2393462" Received: from orviesa009.jf.intel.com ([10.64.159.149]) by fmvoesa105.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 03 Nov 2026 13:23:10 -0800 X-CSE-ConnectionGUID: wESkskv1QdKHqGmfiRw12w== X-CSE-MsgGUID: mg/ht22LR7Oo094rPbZOlw== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.27,193,1787036400"; d="scan'208";a="6624561" Received: from rosenzwe-mobl1.amr.corp.intel.com (HELO agluck-desk3.home.arpa) ([10.124.223.124]) by smtpauth.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 03 Nov 2026 13:23:07 -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: [RFC PATCH v2 02/11] x86/resctrl: Disable symmetric L2 CAT on Panther Lake Date: Tue, 3 Nov 2026 13:22:45 -0800 Message-ID: <20261103212254.18314-3-tony.luck@intel.com> X-Mailer: git-send-email 2.56.0 In-Reply-To: <20261103212254.18314-1-tony.luck@intel.com> References: <20261103212254.18314-1-tony.luck@intel.com> X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Panther Lake reports L2 CAT in the symmetric CPUID leaf even though the feature differs between P-cores and E-cores. Disable the symmetric l2cat option for Panther Lake so resctrl does not enumerate this asymmetric feature as symmetric. Signed-off-by: Tony Luck --- arch/x86/kernel/cpu/resctrl/core.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/arch/x86/kernel/cpu/resctrl/core.c b/arch/x86/kernel/cpu/resctrl/core.c index 7951cfd20da4..709075ffc706 100644 --- a/arch/x86/kernel/cpu/resctrl/core.c +++ b/arch/x86/kernel/cpu/resctrl/core.c @@ -1128,6 +1128,9 @@ static __init void __check_quirks_intel(void) case INTEL_BROADWELL_X: intel_rdt_mbm_apply_quirk(); break; + case INTEL_PANTHERLAKE_L: + set_rdt_options("!l2cat"); + break; } } -- 2.56.0