From nobody Fri Jan 2 15:44:45 2026 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 7D137CD98C0 for ; Tue, 10 Oct 2023 23:34:22 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1343994AbjJJXeV (ORCPT ); Tue, 10 Oct 2023 19:34:21 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56562 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1344209AbjJJXeE (ORCPT ); Tue, 10 Oct 2023 19:34:04 -0400 Received: from NAM11-DM6-obe.outbound.protection.outlook.com (mail-dm6nam11on2043.outbound.protection.outlook.com [40.107.223.43]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B32ADB8; Tue, 10 Oct 2023 16:33:59 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=k5AxDnu0weRenwVyq3Ud+PHD7l3ldar/OvYcY82bbDrRb9qs2r8CS7Yy4MZ4PHbXTw1ZMICUs+ZW9/NpeRrLgw1R/c1iih6cGEWtro+LhHn5mXaQjSugmsRBvTb6F9GXwn5Y74jn8l02cfa/pstysl1ZLEORansN57e7aZJyfsGpKS5urlfmYKtKIYBMOWisHaMHF2t7kemS2p+d2usQmvgmAr9GTnpvsJvGVy9fkXMZVJIYOwXQTQGFTTnzZ0wOjvMEqGEoTeJen7cU5LPn8a16bw5+EiD71/rZ+3zgnf7+m6bVthGr/Ndmzfrm+8U1WTomNp8bvgsr+En9+TxsWg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector9901; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-AntiSpam-MessageData-ChunkCount:X-MS-Exchange-AntiSpam-MessageData-0:X-MS-Exchange-AntiSpam-MessageData-1; bh=H+WfvfgXRMRbjdYp1Vi5GEwXugoe5e8TZLnv0VoakJk=; b=K10bAKJcdIU6yLZbQA4GC8gYEhobbS8PRiWV//JMitkaCBmNbzK22NDhhYlUiOVJK3kBKd52qConVGAHsjDGTzm50rV7MiyzQUangZzHJoXiu7DaZNrUiepyXEbGksW6QmU35d6f+/zTw9CtbYer93Mv9HKb8e2QkxXTsDq+a205LLo3I2BnFhmkbZgx6ExuRgch7Cj8H1Yvsklp8G4/RfluoF4JSrTYcq6owrYw3OayNsy+9zy2j68rnMrQ+nwTEXMIryaARj5UvAFi2AkfkCUJNJE/u3pRjAfAY7l1tlgSv2ij1AsFa3KSh2J7H27wN9tAj1DmVTh8ypxHJNiqGw== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass (sender ip is 165.204.84.17) smtp.rcpttodomain=lwn.net smtp.mailfrom=amd.com; dmarc=pass (p=quarantine sp=quarantine pct=100) action=none header.from=amd.com; dkim=none (message not signed); arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=amd.com; s=selector1; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=H+WfvfgXRMRbjdYp1Vi5GEwXugoe5e8TZLnv0VoakJk=; b=lOwIOFVdPKTKgFN5G7QoqZsp4pHG9fSUTf5G/tMBcccHBNWSC/LM2pxTwbarCsmpO3iM1rRN5h5rsL17NSeTIHUIremKm5lRjoolpQOLOCLHMIwP1ky88H7PQAfVAycmhP89bAWTDL84xfhHeS51Pt2Eb/oJu6FfsaqgacpLd20= Received: from MN2PR17CA0015.namprd17.prod.outlook.com (2603:10b6:208:15e::28) by CH2PR12MB4152.namprd12.prod.outlook.com (2603:10b6:610:a7::8) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.6863.38; Tue, 10 Oct 2023 23:33:54 +0000 Received: from BL6PEPF0001AB4D.namprd04.prod.outlook.com (2603:10b6:208:15e:cafe::ad) by MN2PR17CA0015.outlook.office365.com (2603:10b6:208:15e::28) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.6886.27 via Frontend Transport; Tue, 10 Oct 2023 23:33:54 +0000 X-MS-Exchange-Authentication-Results: spf=pass (sender IP is 165.204.84.17) smtp.mailfrom=amd.com; dkim=none (message not signed) header.d=none;dmarc=pass action=none header.from=amd.com; Received-SPF: Pass (protection.outlook.com: domain of amd.com designates 165.204.84.17 as permitted sender) receiver=protection.outlook.com; client-ip=165.204.84.17; helo=SATLEXMB04.amd.com; pr=C Received: from SATLEXMB04.amd.com (165.204.84.17) by BL6PEPF0001AB4D.mail.protection.outlook.com (10.167.242.71) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.20.6838.22 via Frontend Transport; Tue, 10 Oct 2023 23:33:54 +0000 Received: from bmoger-ubuntu.amd.com (10.180.168.240) by SATLEXMB04.amd.com (10.181.40.145) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.27; Tue, 10 Oct 2023 18:33:53 -0500 From: Babu Moger To: , , , , CC: , , , , , , , , , , , , , , , , , , , , , , , , , , , , , Subject: [PATCH v12 07/10] x86/resctrl: Introduce "-o debug" mount option Date: Tue, 10 Oct 2023 18:33:32 -0500 Message-ID: <20231010233335.998475-8-babu.moger@amd.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20231010233335.998475-1-babu.moger@amd.com> References: <20231010233335.998475-1-babu.moger@amd.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-Originating-IP: [10.180.168.240] X-ClientProxiedBy: SATLEXMB03.amd.com (10.181.40.144) To SATLEXMB04.amd.com (10.181.40.145) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BL6PEPF0001AB4D:EE_|CH2PR12MB4152:EE_ X-MS-Office365-Filtering-Correlation-Id: 310d600b-cbdc-4f34-8ca6-08dbc9e95e3c X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:165.204.84.17;CTRY:US;LANG:en;SCL:1;SRV:;IPV:CAL;SFV:NSPM;H:SATLEXMB04.amd.com;PTR:InfoDomainNonexistent;CAT:NONE;SFS:(13230031)(4636009)(346002)(136003)(396003)(39860400002)(376002)(230922051799003)(186009)(451199024)(1800799009)(82310400011)(64100799003)(36840700001)(40470700004)(46966006)(2616005)(1076003)(2906002)(7696005)(40460700003)(16526019)(81166007)(356005)(82740400003)(86362001)(47076005)(36860700001)(426003)(36756003)(26005)(66574015)(40480700001)(336012)(83380400001)(8676002)(5660300002)(8936002)(44832011)(4326008)(478600001)(41300700001)(316002)(7416002)(54906003)(110136005)(6666004)(70206006)(70586007)(7406005)(36900700001);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 10 Oct 2023 23:33:54.8021 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 310d600b-cbdc-4f34-8ca6-08dbc9e95e3c X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: BL6PEPF0001AB4D.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: CH2PR12MB4152 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Add "-o debug" option to mount resctrl filesystem in debug mode. When in debug mode resctrl displays files that have the new RFTYPE_DEBUG flag to help resctrl debugging. Signed-off-by: Babu Moger Tested-by: Peter Newman Reviewed-by: Peter Newman Tested-by: Tan Shaopeng Reviewed-by: Tan Shaopeng Reviewed-by: Fenghua Yu Reviewed-by: Reinette Chatre Reviewed-by: Ilpo J=C3=A4rvinen --- v12: No changes --- Documentation/arch/x86/resctrl.rst | 5 ++++- arch/x86/kernel/cpu/resctrl/internal.h | 2 ++ arch/x86/kernel/cpu/resctrl/rdtgroup.c | 18 ++++++++++++++++++ 3 files changed, 24 insertions(+), 1 deletion(-) diff --git a/Documentation/arch/x86/resctrl.rst b/Documentation/arch/x86/re= sctrl.rst index 520a7753d829..1774f7b8450f 100644 --- a/Documentation/arch/x86/resctrl.rst +++ b/Documentation/arch/x86/resctrl.rst @@ -35,7 +35,7 @@ about the feature from resctrl's info directory. =20 To use the feature mount the file system:: =20 - # mount -t resctrl resctrl [-o cdp[,cdpl2][,mba_MBps]] /sys/fs/resctrl + # mount -t resctrl resctrl [-o cdp[,cdpl2][,mba_MBps][,debug]] /sys/fs/re= sctrl =20 mount options are: =20 @@ -46,6 +46,9 @@ mount options are: "mba_MBps": Enable the MBA Software Controller(mba_sc) to specify MBA bandwidth in MBps +"debug": + Make debug files accessible. Available debug files are annotated with + "Available only with debug option". =20 L2 and L3 CDP are controlled separately. =20 diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/r= esctrl/internal.h index 2051179a3b91..f0d135e004e2 100644 --- a/arch/x86/kernel/cpu/resctrl/internal.h +++ b/arch/x86/kernel/cpu/resctrl/internal.h @@ -59,6 +59,7 @@ struct rdt_fs_context { bool enable_cdpl2; bool enable_cdpl3; bool enable_mba_mbps; + bool enable_debug; }; =20 static inline struct rdt_fs_context *rdt_fc2context(struct fs_context *fc) @@ -248,6 +249,7 @@ struct rdtgroup { #define RFTYPE_TOP BIT(6) #define RFTYPE_RES_CACHE BIT(8) #define RFTYPE_RES_MB BIT(9) +#define RFTYPE_DEBUG BIT(10) #define RFTYPE_CTRL_INFO (RFTYPE_INFO | RFTYPE_CTRL) #define RFTYPE_MON_INFO (RFTYPE_INFO | RFTYPE_MON) #define RFTYPE_TOP_INFO (RFTYPE_INFO | RFTYPE_TOP) diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/r= esctrl/rdtgroup.c index a34657f0bd0c..150105c21fee 100644 --- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c +++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c @@ -59,6 +59,8 @@ static void rdtgroup_destroy_root(void); =20 struct dentry *debugfs_resctrl; =20 +static bool resctrl_debug; + void rdt_last_cmd_clear(void) { lockdep_assert_held(&rdtgroup_mutex); @@ -1874,6 +1876,9 @@ static int rdtgroup_add_files(struct kernfs_node *kn,= unsigned long fflags) =20 lockdep_assert_held(&rdtgroup_mutex); =20 + if (resctrl_debug) + fflags |=3D RFTYPE_DEBUG; + for (rft =3D rfts; rft < rfts + len; rft++) { if (rft->fflags && ((fflags & rft->fflags) =3D=3D rft->fflags)) { ret =3D rdtgroup_add_file(kn, rft); @@ -2377,6 +2382,8 @@ static void rdt_disable_ctx(void) resctrl_arch_set_cdp_enabled(RDT_RESOURCE_L3, false); resctrl_arch_set_cdp_enabled(RDT_RESOURCE_L2, false); set_mba_sc(false); + + resctrl_debug =3D false; } =20 static int rdt_enable_ctx(struct rdt_fs_context *ctx) @@ -2401,6 +2408,9 @@ static int rdt_enable_ctx(struct rdt_fs_context *ctx) goto out_cdpl3; } =20 + if (ctx->enable_debug) + resctrl_debug =3D true; + return 0; =20 out_cdpl3: @@ -2605,6 +2615,7 @@ enum rdt_param { Opt_cdp, Opt_cdpl2, Opt_mba_mbps, + Opt_debug, nr__rdt_params }; =20 @@ -2612,6 +2623,7 @@ static const struct fs_parameter_spec rdt_fs_paramete= rs[] =3D { fsparam_flag("cdp", Opt_cdp), fsparam_flag("cdpl2", Opt_cdpl2), fsparam_flag("mba_MBps", Opt_mba_mbps), + fsparam_flag("debug", Opt_debug), {} }; =20 @@ -2637,6 +2649,9 @@ static int rdt_parse_param(struct fs_context *fc, str= uct fs_parameter *param) return -EINVAL; ctx->enable_mba_mbps =3D true; return 0; + case Opt_debug: + ctx->enable_debug =3D true; + return 0; } =20 return -EINVAL; @@ -3705,6 +3720,9 @@ static int rdtgroup_show_options(struct seq_file *seq= , struct kernfs_root *kf) if (is_mba_sc(&rdt_resources_all[RDT_RESOURCE_MBA].r_resctrl)) seq_puts(seq, ",mba_MBps"); =20 + if (resctrl_debug) + seq_puts(seq, ",debug"); + return 0; } =20 --=20 2.34.1