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 78FD63BCD04 for ; Sun, 2 Aug 2026 16:17:59 +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=1785687483; cv=none; b=h91EhUoJqD7HhReX2ZPd92DqAEoMPXVJgrTFSCzzljYubJ5fqZTfhpVci2UCllWDOFVsZUcWlSLOY4bv1rgwMeUkyh/6assgX/n3Uaj1ng8MJJvCWG0cxoaHOO1hjaBwWmqa/k9JCLlUYPOTP600i68MVBHb37CrlwQBFx21Oxg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785687483; c=relaxed/simple; bh=I7kqj3DxwHb9oTpWsJqBC6kC956fDWfMe1rcR2VFCvc=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version:Content-Type; b=TTIRsAroUYAsfNd/VFX4B1a0XVmSWaCtPBN4PbYohLvUdnJmZ/xqAM35mA9GlhD7F4hvzrH3RQzzNo7kIJfXKhSrCm0l6ZLgnF1TpC6iw3zgMTRhWp8zpqOmr8MnvnAElKFJ10z/wE0ryZeUtztwpqbagT4E6waeIAjJ4ODqWKc= 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=VBF4+qcW; 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="VBF4+qcW" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1785687480; x=1817223480; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=I7kqj3DxwHb9oTpWsJqBC6kC956fDWfMe1rcR2VFCvc=; b=VBF4+qcW3ow3dBRXDCredNm5qidFGo1B1KAu1F+KrlJn65yVFqwUcFJU 4FKC+xcRDnpJti3naZOpcvShzefZSwX9fqmx5obgTJpdH9YSsZcbx6fkq ARVdvWFSq22VccoMz6lZcpoSouUnxLX57fVfOtXMwWzCX7OKQ7hgtjAii CJ6Sl+6/75Rgknnh0fliuWYaFT2NhyTG7bQA9FNLiYlFxLiNyMwN+GjVz 1SSqOKJ2ltuARUrlQdrXOaC+w0Gz15PSU16B/1ErELyQtQ591r1MkLMFj w3pOdSOwvxEgAdjTn2t4nkZqQ9mA7Za0URJ/0d5sXPlZw3aQI7SlXW9r1 g==; X-CSE-ConnectionGUID: 12t3au0/RtWNalDIIqPA8w== X-CSE-MsgGUID: ypBVLUQcQu6TRigmrTdUtw== X-IronPort-AV: E=McAfee;i="6800,10657,11863"; a="86258048" X-IronPort-AV: E=Sophos;i="6.25,200,1779174000"; d="scan'208";a="86258048" 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 09:17:58 -0700 X-CSE-ConnectionGUID: v8QE8Wq4Tkqc7j0PclNqnA== X-CSE-MsgGUID: apPlARzBQPS98rMQZ8ijTg== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.25,200,1779174000"; d="scan'208";a="290950380" Received: from chenyu-dev.sh.intel.com ([10.239.62.107]) by orviesa002.jf.intel.com with ESMTP; 02 Aug 2026 09:17:56 -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 29/31] fs/resctrl: Expose emulation controllers in a resource_schemata subdir Date: Mon, 3 Aug 2026 00:08:14 +0800 Message-Id: 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-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit The legacy MBA default controller is emulated by other controls (for ERDT, "MB" is emulated by the MAX control of every memory region). When a control is emulated (resctrl_ctrl::emul is not empty), do not expose the control's own properties. Keep the control's own resource_schemata directory and, underneath it, create a sub-directory named after each emulation controller that holds that emulation controller's properties. For example: [root@ MB]# tree resource_schemata/ resource_schemata/ ├── MB │ ├── MB_REGION0_MAX │ │ ├── max │ │ ├── min │ │ ├── resolution │ │ ├── scale │ │ ├── scope │ │ ├── tolerance │ │ ├── type │ │ └── unit │ └── MB_REGION1_MAX │ ├── max │ ├── min │ ├── resolution │ ├── scale │ ├── scope │ ├── tolerance │ ├── type │ └── unit Controls without an emulation controller keep exposing their own properties directly. Signed-off-by: Chen Yu --- fs/resctrl/rdtgroup.c | 31 +++++++++++++++++++++++++++---- 1 file changed, 27 insertions(+), 4 deletions(-) diff --git a/fs/resctrl/rdtgroup.c b/fs/resctrl/rdtgroup.c index c1aac0dcd332..31bea5a9833b 100644 --- a/fs/resctrl/rdtgroup.c +++ b/fs/resctrl/rdtgroup.c @@ -2741,13 +2741,36 @@ static int resctrl_mkdir_schemata_dir(struct kernfs_node *kn, if (IS_ERR(kn_ctrl)) return PTR_ERR(kn_ctrl); - ret = rdtgroup_kn_set_ugid(kn_subdir); + ret = rdtgroup_kn_set_ugid(kn_ctrl); if (ret) return ret; - ret = resctrl_add_ctrl_files(kn_ctrl, ctrl); - if (ret) - return ret; + if (!list_empty(&ctrl->emul)) { + struct kernfs_node *kn_emul; + struct resctrl_ctrl *emul; + + for_each_emul_ctrl(emul, ctrl) { + snprintf(ctrl_full_name, sizeof(ctrl_full_name), "%s_%s", + f->name, resctrl_ctrl_name_str(emul->name)); + + kn_emul = kernfs_create_dir(kn_ctrl, ctrl_full_name, + kn_ctrl->mode, emul); + if (IS_ERR(kn_emul)) + return PTR_ERR(kn_emul); + + ret = rdtgroup_kn_set_ugid(kn_emul); + if (ret) + return ret; + + ret = resctrl_add_ctrl_files(kn_emul, emul); + if (ret) + return ret; + } + } else { + ret = resctrl_add_ctrl_files(kn_ctrl, ctrl); + if (ret) + return ret; + } } kernfs_activate(kn_subdir); -- 2.43.0