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 B42451F3D56 for ; Sun, 2 Aug 2026 16:16:56 +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=1785687418; cv=none; b=pvudxAQuUmRzA/zmi7HWonBygm6StKotOEkkZItrLmgiFsATzhBwjzQk8JiN/IzkK8o4ioTaqyfbupunLSuRo9SKAfR3s0Lo9Be9E2q9MckmaP1UNw+RyrvU/M47Eenz+AtJ5Wfg1i7m45Gs6Q8WcSrQLFQfj0PxPrN7cezYWBA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785687418; c=relaxed/simple; bh=GObUdRXC1nbCJUBPTQYkmd/sdvoB68RpqO/28nRoT8U=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=eGGSwCRfKjChLqL7p70EiAMz+oL92G7sgmwoCbWnkLCYYyReuE1ES7sVfl4vj+rcTna8k2c9CMJLD6SplroqbibqKXuvLpmTfFJeYMuryOQoQBYctBctqV9c1/J+3eJ9uZgqLnd/54d6DaGQ9/87D91wnzlqhLulegCDG4qW5GI= 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=Tn/ETWLV; 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="Tn/ETWLV" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1785687416; x=1817223416; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=GObUdRXC1nbCJUBPTQYkmd/sdvoB68RpqO/28nRoT8U=; b=Tn/ETWLVnrdxMVmaBxB/CK2nFIUb/F0KYLYTXSREuXfjEw4C7ma5QjNt jMaC4pJyFTv3qkMFL4+wwzQTiCOaDnDWOor/hIe0c92CS4FYlFfr67tpw IopEBh5zHibfqcmL98gAyee5SMo8UqZ6N7tXaNBoeViuqggQlLc+o5F17 6PHYSlbzY37qbOm8xolDotymywd2VmruOVysfmmA53ImUqWQ4SfIEnuX1 XCdpY/1nmbL28h9NZVb179gkLIT2VvHewvLAgVnEQ2TRN/r7GPNTlXzXA RJQNuX4ELRaMmVRmHOq6ZpcUzU0YhaFy7pbJ24JR0MhmVHNJWJBRys12B A==; X-CSE-ConnectionGUID: Ct1OSQ+rRXSN896W3NE25A== X-CSE-MsgGUID: HHgZodg4Se6kY/LRFAnUFA== X-IronPort-AV: E=McAfee;i="6800,10657,11863"; a="86257981" X-IronPort-AV: E=Sophos;i="6.25,200,1779174000"; d="scan'208";a="86257981" 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 09:16:56 -0700 X-CSE-ConnectionGUID: IFXIU3UDQiCYVVnE4SKQEg== X-CSE-MsgGUID: tUaly3u8Tz2ZRebji1zNtA== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.25,200,1779174000"; d="scan'208";a="290950265" Received: from chenyu-dev.sh.intel.com ([10.239.62.107]) by orviesa002.jf.intel.com with ESMTP; 02 Aug 2026 09:16:53 -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 22/31] fs/resctrl: Add region-based control names and resctrl_ctrl_name_region() Date: Mon, 3 Aug 2026 00:07:11 +0800 Message-Id: <7381b1ec938bd552fc51b6aad143888fd91ef969.1785680802.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 ERDT exposes per-memory-region bandwidth allocation controls, where each region has an optimal (OPT), minimum (MIN) and maximum (MAX) control. Extend enum resctrl_ctrl_name with the REGION_{OPT,MIN,MAX} names (and their string forms). These enumerators are only assigned to a control when arch code adds a region control to rdt_resource::controls, which happens only when the hardware supports ERDT (erdt_cpu_has()); on other platforms they are simply unused. Add resctrl_ctrl_name_region() so that the architecture code can retrieve the control name for a given region and control type when creating the corresponding controllers. Signed-off-by: Chen Yu --- fs/resctrl/ctrlmondata.c | 12 ++++++++++++ include/linux/resctrl.h | 29 ++++++++++++++++++++++++++++- 2 files changed, 40 insertions(+), 1 deletion(-) diff --git a/fs/resctrl/ctrlmondata.c b/fs/resctrl/ctrlmondata.c index 74fa1215e8b2..d65036f7079e 100644 --- a/fs/resctrl/ctrlmondata.c +++ b/fs/resctrl/ctrlmondata.c @@ -304,6 +304,18 @@ static const char * const resctrl_ctrl_name[] = { [RESCTRL_CTRL_NAME_DEF] = "", [RESCTRL_CTRL_NAME_MIN] = "MIN", [RESCTRL_CTRL_NAME_MAX] = "MAX", + [RESCTRL_CTRL_NAME_REGION0_OPT] = "REGION0_OPT", + [RESCTRL_CTRL_NAME_REGION0_MIN] = "REGION0_MIN", + [RESCTRL_CTRL_NAME_REGION0_MAX] = "REGION0_MAX", + [RESCTRL_CTRL_NAME_REGION1_OPT] = "REGION1_OPT", + [RESCTRL_CTRL_NAME_REGION1_MIN] = "REGION1_MIN", + [RESCTRL_CTRL_NAME_REGION1_MAX] = "REGION1_MAX", + [RESCTRL_CTRL_NAME_REGION2_OPT] = "REGION2_OPT", + [RESCTRL_CTRL_NAME_REGION2_MIN] = "REGION2_MIN", + [RESCTRL_CTRL_NAME_REGION2_MAX] = "REGION2_MAX", + [RESCTRL_CTRL_NAME_REGION3_OPT] = "REGION3_OPT", + [RESCTRL_CTRL_NAME_REGION3_MIN] = "REGION3_MIN", + [RESCTRL_CTRL_NAME_REGION3_MAX] = "REGION3_MAX", }; const char *resctrl_ctrl_name_str(enum resctrl_ctrl_name name) diff --git a/include/linux/resctrl.h b/include/linux/resctrl.h index 7bbda28baccf..3969db01f4cc 100644 --- a/include/linux/resctrl.h +++ b/include/linux/resctrl.h @@ -348,14 +348,41 @@ struct resctrl_mon { * has the same name as the resource. * @RESCTRL_CTRL_NAME_MIN: "MIN" * @RESCTRL_CTRL_NAME_MAX: "MAX" + * + * The REGION* names describe the region based bandwidth allocation controls of + * each memory region has an optimal (OPT), minimum (MIN) andcmaximum (MAX) control. + * They are only ever assigned to a control when arch code adds a region control + * to rdt_resource::controls, which happens only when the hardware supports ERDT + * (erdt_cpu_has()); on other platforms these enumerators are simply unused. */ enum resctrl_ctrl_name { RESCTRL_CTRL_NAME_DEF, RESCTRL_CTRL_NAME_MIN, RESCTRL_CTRL_NAME_MAX, - RESCTRL_CTRL_NAME_LAST = RESCTRL_CTRL_NAME_MAX + RESCTRL_CTRL_NAME_REGION0_OPT, + RESCTRL_CTRL_NAME_REGION0_MIN, + RESCTRL_CTRL_NAME_REGION0_MAX, + RESCTRL_CTRL_NAME_REGION1_OPT, + RESCTRL_CTRL_NAME_REGION1_MIN, + RESCTRL_CTRL_NAME_REGION1_MAX, + RESCTRL_CTRL_NAME_REGION2_OPT, + RESCTRL_CTRL_NAME_REGION2_MIN, + RESCTRL_CTRL_NAME_REGION2_MAX, + RESCTRL_CTRL_NAME_REGION3_OPT, + RESCTRL_CTRL_NAME_REGION3_MIN, + RESCTRL_CTRL_NAME_REGION3_MAX, + RESCTRL_CTRL_NAME_LAST = RESCTRL_CTRL_NAME_REGION3_MAX }; +#define RESCTRL_CTRL_REGION_NR_CTRLS 3 + +static inline enum resctrl_ctrl_name +resctrl_ctrl_name_region(unsigned int region, unsigned int type) +{ + return RESCTRL_CTRL_NAME_REGION0_OPT + + region * RESCTRL_CTRL_REGION_NR_CTRLS + type; +} + /* Flags for rdt_resource::flags and resctrl_ctrl::flags */ #define RESCTRL_CTRL_FLAG_LINEAR BIT(0) #define RESCTRL_CTRL_FLAG_SPARSE_BITMASKS BIT(1) -- 2.43.0