From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.17]) (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 3AE6F2F3C19 for ; Sun, 2 Aug 2026 16:12:23 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.175.65.17 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785687144; cv=none; b=JAwNwdGmX24wBNxMOoM/M1Vx7Up2v8XGkO748ZfQ41OTNYjBNlDiOnYQypaZyk2NZ8q0X3p4R4OWcyG8aXvWZKKHZR7VEkewCfahDcBD7Q8dcSRJiCRRy2E5PKx/nbibSPaecbWfC2E5JDrqs139CI8oKaL76Fqar4aXR+8IZIg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785687144; c=relaxed/simple; bh=ZE2Y91gk/VQ99NLobnJFpWPJY+SyQSjpXrMNLrMaoME=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=XVW/9qJiytyEHKnOzydq2f8dyldMMCxKiCnCbbcgTKp7QTzfdA/3geGtXh+HAH8C/Lc0sVvso7UQq6P76uOtC7nRoqdbR3Xse4bRQVSgFnDcYDh0JVYIO4IN/ydsfiEYpsDBTVp4/2f2NykUV8YsKV9N1d84p2D1oi+x7JshW34= 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=EdzwXTeW; arc=none smtp.client-ip=198.175.65.17 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="EdzwXTeW" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1785687143; x=1817223143; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=ZE2Y91gk/VQ99NLobnJFpWPJY+SyQSjpXrMNLrMaoME=; b=EdzwXTeWjL7rJYFnUEVKiC6/h0lJSCdaLfjkAftUF5axxJ10h1xjEhQV ykgPszbt7MmWUck3TIq3EYionhzVnbDp/s9HbvmOMYOeWeldqeqz35h0j P+N5sjlqpd9HFFqgsC1Uy8vQm8o2V+70QuCNr/6d8nRGulnJnpGAE6CHL LzHGMVlKHnpa6nF+uWMsrmd/Zj+kNMGWnyVUbTI4efoVZpMux2n9O9ZR7 DmvUSr9dh61DyWgF6Ygs5ov/4HElDONmO70kPqJG7f4XoVzv4LE51VSVK 0DmYBijb7xuhjuJo3+gKLIFD/s2aHwztxk2tpS8kh35c7pQr7h2/D1Jwp Q==; X-CSE-ConnectionGUID: Lj1Ht4D8RO+oUYarxCKtCQ== X-CSE-MsgGUID: Bw2kF6jLRJWPlnXBuuPBKg== X-IronPort-AV: E=McAfee;i="6800,10657,11863"; a="86257767" X-IronPort-AV: E=Sophos;i="6.25,200,1779174000"; d="scan'208";a="86257767" Received: from orviesa002.jf.intel.com ([10.64.159.142]) by orvoesa109.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 02 Aug 2026 09:12:22 -0700 X-CSE-ConnectionGUID: YyJ2E9H5S1W5qtvGhXN4Nw== X-CSE-MsgGUID: S9QSxFeuTmC7EYfN5iti1g== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.25,200,1779174000"; d="scan'208";a="290949573" Received: from chenyu-dev.sh.intel.com ([10.239.62.107]) by orviesa002.jf.intel.com with ESMTP; 02 Aug 2026 09:12:20 -0700 From: Chen Yu To: Reinette Chatre , Tony Luck Cc: Ben Horgan , "James Morse" , Dave Martin , Babu Moger , Fenghua Yu , Borislav Petkov , Thomas Gleixner , "Dave Hansen" , Peter Newman , chen.yu@linux.dev, x86@kernel.org, linux-kernel@vger.kernel.org Subject: [RFC PATCH 02/31] x86/resctrl: Require 64-bit x86 for resctrl support Date: Mon, 3 Aug 2026 00:02:38 +0800 Message-Id: <4700db5c6f54066e21fa05f2946bad85176717a1.1785680802.git.yu.c.chen@intel.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit All known hardware that supports Intel RDT or AMD QoS is 64-bit. Future enhancements like MMIO-based Enhanced RDT (ERDT) monitoring require readq()/writeq() which are only available on 64-bit. There is also no realistic use case for users to build a 32-bit kernel on a server and enable resctrl. Drop 32-bit support by changing the X86_CPU_RESCTRL dependency from X86 to X86_64. Since X86_CPU_RESCTRL now implies X86_64, remove the redundant X86_64 dependency from X86_CPU_RESCTRL_INTEL_AET. Tested-by: Hongyu Ning Signed-off-by: Chen Yu --- arch/x86/Kconfig | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index f3f7cb01d69d..97d210bd9bb5 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -515,7 +515,7 @@ 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 @@ -538,7 +538,7 @@ 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. -- 2.43.0