From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=198.175.65.16 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1792443073; b=yAktswD/tMTq5LyT/PbOUFffGFJkbOsi+nw9ZciM4TTdkLfGFjOTu11qVAkM2mC8wkGH kJOnCQfOd3mz4iC7UQ2J5JfiwpflDlSFh6yV9Q1xyW5ZW4G2Tsfwe8gi8Vi6IqsnXz5+y UjvFR5NHLfeArwV8y+4odpVVTTcvxFfY9DTK9Wr4M4BTgaDl4hMYJk8C4rd+kgF9SyB2o Ydsf2r8m0cTZqp90tRK44biIEPUCgPjfGb0+hSfLgNuLRtFp8MONMqaZI2K3jx8dMrGs8 DfdU/QPWwPxsxei6RyrYVP4NkM88R13/7J3g6AQO/w5ior/FOvwiHO0RlXcVOqAFzVQ== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1792443073; 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=k1sNnZdMrY8Xw8RH0rFCdkCjaTS9ovoPnIf+IQOoRWQ=; b=jBNig2TJFm2UCsN1B+//KFD0ah2sQ9lFP9KWEllsDd/1f/8U0+R6OQaY8Gn/qkFt+cXb t8AUwaw7zrfp758eubntxAAEE8+w0T3pypqzFQPR2ukRK88KuDhbAEZQNWxlflJKPVtqR Z8yIfnq1UN0ZuBTXPws2fitNkkrRj1DLEB5oC8aXWjftQHLHwumBVOtBdE4X7H1Iw9YKk kkxdsuB6J1mBf0UAAEYjhYHUPiuzeSHYK1vgldXGAHxBoPBHmLlkXhcLa+0Mf8GEi1dMG ZMdZ+HdoN77coi8G+m24ByiITFnEdPiFH0Os7ofYup86OsqZJwv0tymPHJ/GtFx0l+A== 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="K68/1j5d"; arc=none smtp.remote-ip=198.175.65.16 Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.16]) (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 5980D60A382A for ; Mon, 19 Oct 2026 20:51:09 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.2 smtp.subspace.kernel.org 5980D60A382A 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=K68/1j5d DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1792443069; x=1823979069; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=WYsdRrfJuaf/uEqJnoHVEx7Rgt1D5015c/sEvBLD9MI=; b=K68/1j5dj4oNif/eSZ6oct9qEeVDZvOrG8CnOTq/THejH/qlTdOhFgsy uhu3swLoYfWSLul+MXsoz/7GBIumOtmzVVRJyU60okRA7zkeVwOaxvjB9 Tu4fdh2XtxCrmIcABpwsIdWWH7xhLWaNLsh3k3sb/0FfBa4nGcGuUL7EA FMLV+Im4rNY6njzCmNdtPd1c3Cly3TkOPdW+cPZuOowUvFoyb+8UwIfZV S8q325z731blAmCns9rTPrZa3/t6XLfWdz28vYsYMOJLhWVKUq93QKViY 5krQn8FRMAudAKuNzdqxh4BMJcfXzttruVoP0Lq55/f+07PSn0+H/729V Q==; X-CSE-ConnectionGUID: shFM1nWVTWOVFMVOKHIcKw== X-CSE-MsgGUID: XxlcLiKdTfuSsAbiTHAHIg== X-IronPort-AV: E=McAfee;i="6800,10657,11940"; a="1131304" X-IronPort-AV: E=Sophos;i="6.27,168,1787036400"; d="scan'208";a="1131304" Received: from fmviesa009.fm.intel.com ([10.60.135.149]) by orvoesa108.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 19 Oct 2026 13:50:52 -0700 X-CSE-ConnectionGUID: PpbH1qWORWWHvfMSR/O21w== X-CSE-MsgGUID: cHP7J4KpQE6FNtWuyRfPCg== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.27,168,1787036400"; d="scan'208";a="3008702" Received: from spandruv-mobl5.amr.corp.intel.com (HELO agluck-desk3.intel.com) ([10.124.220.87]) by smtpauth.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 19 Oct 2026 13:50:52 -0700 From: Tony Luck To: Fenghua Yu , Reinette Chatre , Maciej Wieczor-Retman , Peter Newman , James Morse , Babu Moger , Drew Fustini , Dave Martin , Chen Yu , David E Box , x86@kernel.org Cc: Christoph Hellwig , linux-kernel@vger.kernel.org, patches@lists.linux.dev, Tony Luck Subject: [PATCH v14 22/24] x86/resctrl: Require 64-bit x86 for resctrl support Date: Mon, 19 Oct 2026 13:50:29 -0700 Message-ID: <20261019205031.16977-23-tony.luck@intel.com> X-Mailer: git-send-email 2.56.0 In-Reply-To: <20261019205031.16977-1-tony.luck@intel.com> References: <20261019205031.16977-1-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 Intel Application Energy Telemetry (AET) provides event counts in 64-bit MMIO registers. For accurate results these must be read with a single 64-bit load, which is only available to 64-bit kernels, so AET support depends on X86_64. AET is about to become an unconditional part of x86 resctrl instead of being selected by the separate CONFIG_X86_CPU_RESCTRL_INTEL_AET option. resctrl can then no longer be built for 32-bit kernels. Make resctrl depend on X86_64, in preparation for removing CONFIG_X86_CPU_RESCTRL_INTEL_AET. This drops resctrl support from 32-bit kernels, in line with Dave Hansen's proposal [1] to document reduced support for 32-bit x86. Keeping support for 32-bit kernels is not worth it. Modern systems that support resctrl almost always have more memory than can be addressed by a 32-bit Linux kernel. Signed-off-by: Tony Luck Link: https://lore.kernel.org/all/c6ab0c24-8931-4f0d-9be6-23498ab4c38b@intel.com/ # [1] --- v14: New commit message. --- arch/x86/Kconfig | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index 15fd9ec5ecac..06b5d0c4633e 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -518,7 +518,7 @@ config X86_MPPARSE config X86_CPU_RESCTRL bool "x86 CPU resource control support" - depends on X86 && (CPU_SUP_INTEL || CPU_SUP_AMD) + depends on X86_64 && (CPU_SUP_INTEL || CPU_SUP_AMD) depends on MISC_FILESYSTEMS select ARCH_HAS_CPU_RESCTRL select RESCTRL_FS @@ -541,7 +541,7 @@ config X86_CPU_RESCTRL config X86_CPU_RESCTRL_INTEL_AET bool "Intel Application Energy Telemetry" - depends on X86_64 && X86_CPU_RESCTRL && CPU_SUP_INTEL && INTEL_PMT_TELEMETRY=y && INTEL_TPMI=y + depends on X86_CPU_RESCTRL && CPU_SUP_INTEL && INTEL_PMT_TELEMETRY=y && INTEL_TPMI=y help Enable per-RMID telemetry events in resctrl. -- 2.56.0