From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from DB3PR0202CU003.outbound.protection.outlook.com (mail-northeuropeazon11010060.outbound.protection.outlook.com [52.101.84.60]) (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 80CA02FC3A9 for ; Wed, 2 Jul 2025 16:22:37 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=fail smtp.client-ip=52.101.84.60 ARC-Seal:i=3; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1751473360; cv=fail; b=TimIjVUUFRw34iCb2bI9MN5NVMVNGlYpOwSXLxFO+w3FscpDn9qU2cn384HNt8DfGoAy5g/QBLgxBzZBRImcwqyl0bbocZLD1pyldZPKjaoO0C/9FhUNiyzs3GSfxMMx9OPPCOPx3j5rEURp0WnnW6n6cVbj25JYDT4tuMGLtuo= ARC-Message-Signature:i=3; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1751473360; c=relaxed/simple; bh=IOb+Hep2gDO4yV1VMS2xavKfhELAoiSNwhfIvhMFXsE=; h=Date:From:To:Cc:Subject:Message-ID:References:Content-Type: Content-Disposition:In-Reply-To:MIME-Version; b=G2oXloPwx8O+6T7YUa0GScCZ3dOrjo6SDf8s4fbvtpsjCn7sGDXsxYXYn3QeWGdQLMwWfsjQy25fE68L811/Uhh1uR5elOzVmc0SdOnBPCDYFqxuky0bEWYxjD3wsnBZFAqOesaoq6efySpPxbZSB4ZHe1GSmHoatC+Z1oOsOy8= ARC-Authentication-Results:i=3; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com; spf=pass smtp.mailfrom=arm.com; dkim=pass (1024-bit key) header.d=arm.com header.i=@arm.com header.b=S1Qt0RGO; dkim=pass (1024-bit key) header.d=arm.com header.i=@arm.com header.b=S1Qt0RGO; arc=fail smtp.client-ip=52.101.84.60 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=arm.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=arm.com header.i=@arm.com header.b="S1Qt0RGO"; dkim=pass (1024-bit key) header.d=arm.com header.i=@arm.com header.b="S1Qt0RGO" ARC-Seal: i=2; a=rsa-sha256; s=arcselector10001; d=microsoft.com; cv=pass; b=yJMdP0eemcP6atNqB2XzxB5ARPzcXQ82vmmUsH70QorXThMnJvxs259zqiRRsuMfPrDc/VghxHqyAx2pQKHcP5PzZCCJunKcqYdsBAuUYf7x1xUXR4XpYwTHcjC2dEJFtQEuCif0pIZYiFKyMV/PE3WunuuROm7dq5rpVA6zRJR0O9paNGFm1sbHVbC13G02Z6jhRt3BCBQzfI/QpPL8uat/kjTD14mduGl0CHUrxuaCMNiolYD7w7Gps+Pcng30QUJvW3pp5SSpxh+f0+omIMb/0ibWTywlz6KJjHdkRguFQsJPQbLnanHID2lWYVAsgpFI991qpv7c7sBQZOvJyg== ARC-Message-Signature: i=2; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector10001; 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=UXQ6jDoB+KGmh3iMkA3fqpoROxC/ks4eGvYjmA40akk=; b=tHCFbUtiIXQ8ujhqsLdfiapQTWoy2kc7hOi3DGS0A5fBZr8ft8B62NzfxP8Kyrp17UG5r5AX11QPgiAZuWyQVtvB3wEHOjy4s4giFhnAgdOAexN+1KN7fa9vJ5Yy7jq/XsmTOctfz/Vjg/blIJYUPNV4HUnjfj/W8esdaGdh6ab6sPf+wtvcuGdHpjmU34vivQ6g6uVWNQHSru/lAUbe9PxXP1no7+CY2TeuRNBsUOIBcwtl+iPAatzgA2s+LaT4YeI8lRQA5pEmpPPDHEvy1Q2W1SnWk6EXZHXb2EZjctgFR7l634iwkwe1aTKrkxWa0/Ur+0uoJxlfUizM21JdiQ== ARC-Authentication-Results: i=2; mx.microsoft.com 1; spf=pass (sender ip is 4.158.2.129) smtp.rcpttodomain=linaro.org smtp.mailfrom=arm.com; dmarc=pass (p=none sp=none pct=100) action=none header.from=arm.com; dkim=pass (signature was verified) header.d=arm.com; arc=pass (0 oda=1 ltdi=1 spf=[1,1,smtp.mailfrom=arm.com] dkim=[1,1,header.d=arm.com] dmarc=[1,1,header.from=arm.com]) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=arm.com; s=selector1; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=UXQ6jDoB+KGmh3iMkA3fqpoROxC/ks4eGvYjmA40akk=; b=S1Qt0RGO8/0fBKrzSF8KGXSq7oO4SlNcLvylV1ZJ7T7z6QZsLcSIyurdpBRnbgWoPMTDEmDwDQWwvjU8DDnXf/hAzZumHP1bQplyY56tnKXEl/6QtlXuBMR1HdSRt1/v6W3mZS2cnq5ljR7YkhoXjbbvB6ibeqXzS1O5l5+yaFk= Received: from CWLP265CA0388.GBRP265.PROD.OUTLOOK.COM (2603:10a6:400:1d6::16) by AM9PR08MB6146.eurprd08.prod.outlook.com (2603:10a6:20b:2db::17) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.8901.20; Wed, 2 Jul 2025 16:22:31 +0000 Received: from AMS0EPF00000197.eurprd05.prod.outlook.com (2603:10a6:400:1d6:cafe::c3) by CWLP265CA0388.outlook.office365.com (2603:10a6:400:1d6::16) with Microsoft SMTP Server (version=TLS1_3, cipher=TLS_AES_256_GCM_SHA384) id 15.20.8901.20 via Frontend Transport; Wed, 2 Jul 2025 16:22:31 +0000 X-MS-Exchange-Authentication-Results: spf=pass (sender IP is 4.158.2.129) smtp.mailfrom=arm.com; dkim=pass (signature was verified) header.d=arm.com;dmarc=pass action=none header.from=arm.com; Received-SPF: Pass (protection.outlook.com: domain of arm.com designates 4.158.2.129 as permitted sender) receiver=protection.outlook.com; client-ip=4.158.2.129; helo=outbound-uk1.az.dlp.m.darktrace.com; pr=C Received: from outbound-uk1.az.dlp.m.darktrace.com (4.158.2.129) by AMS0EPF00000197.mail.protection.outlook.com (10.167.16.219) with Microsoft SMTP Server (version=TLS1_3, cipher=TLS_AES_256_GCM_SHA384) id 15.20.8901.15 via Frontend Transport; Wed, 2 Jul 2025 16:22:30 +0000 ARC-Seal: i=1; a=rsa-sha256; s=arcselector10001; d=microsoft.com; cv=none; b=LoMYFx2nSy4MIsZYQdIp37of4v4++BR6kdxrOtoEPGYIwDKYkNFU/OZQ6lPCCSXRRp5aE3wN/8U2EP+82xbl2+kkLaB06Cm0cqHr3UR0ZOkMDaWLC7ELpriGR0sxft9JUtwj5MjegAxC8VcYU4FDadMUU28knUNHDDqt1y3ROHnBYIozNUgmhRccGMah+OF+YhW+WVWvb9s8kt+ImPmFakEU4AI7XLQLexOG6vxhIxRa/jh5ALCuaaBVY5gpM0Jupa7/ynsUIiYK4hX7AG+LTL+YVV0w0uebTUv8GOyHZm7kchXqBh6I6OHeYj86AXhS+019pU28yWipPIyfHLStvg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector10001; 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=UXQ6jDoB+KGmh3iMkA3fqpoROxC/ks4eGvYjmA40akk=; b=MwgbyrBcRAP0/zRFH0RwFplOih7run6Bi4B31/C623HGWaHEgm9D5Grsnzcs5+mY3E90SIyFGkOkyn/Jw0vWgB/xFekfyriSOYJ6IhrJ77/s9Yn9jv6Ap7tYWlL1TkwtCYi0AFXDLa+SBMFQqVczJ8jmdOl2Ga4RJpULwU9BcPWLqOtYC0HgNIY4I2Bcnjqzz2QSbuRo1Vz7cdz38Sx2xuvA4uNwHCToXQUoI4/+JzWgLlAxauQiWZtv8pStZOdADK+puVjqam9xeGiCM+w/MyNJL3opIStI8+GyS8Vn150U6mRx76Hc/EaNj1XCRN6hAY7pqtFthCWE8evc7xsmQQ== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=arm.com; dmarc=pass action=none header.from=arm.com; dkim=pass header.d=arm.com; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=arm.com; s=selector1; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=UXQ6jDoB+KGmh3iMkA3fqpoROxC/ks4eGvYjmA40akk=; b=S1Qt0RGO8/0fBKrzSF8KGXSq7oO4SlNcLvylV1ZJ7T7z6QZsLcSIyurdpBRnbgWoPMTDEmDwDQWwvjU8DDnXf/hAzZumHP1bQplyY56tnKXEl/6QtlXuBMR1HdSRt1/v6W3mZS2cnq5ljR7YkhoXjbbvB6ibeqXzS1O5l5+yaFk= Authentication-Results-Original: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=arm.com; Received: from GV1PR08MB10521.eurprd08.prod.outlook.com (2603:10a6:150:163::20) by PAVPR08MB9579.eurprd08.prod.outlook.com (2603:10a6:102:31a::6) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.8880.31; Wed, 2 Jul 2025 16:21:56 +0000 Received: from GV1PR08MB10521.eurprd08.prod.outlook.com ([fe80::d430:4ef9:b30b:c739]) by GV1PR08MB10521.eurprd08.prod.outlook.com ([fe80::d430:4ef9:b30b:c739%5]) with mapi id 15.20.8880.027; Wed, 2 Jul 2025 16:21:56 +0000 Date: Wed, 2 Jul 2025 17:21:53 +0100 From: Yeoreum Yun To: Leo Yan Cc: Suzuki K Poulose , Mike Leach , James Clark , Greg Kroah-Hartman , Alexander Shishkin , Yabin Cui , Keita Morisaki , Yuanfang Zhang , coresight@lists.linaro.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v2 06/28] coresight: etm4x: Add context synchronization before enabling trace Message-ID: References: <20250701-arm_cs_pm_fix_v3-v2-0-23ebb864fcc1@arm.com> <20250701-arm_cs_pm_fix_v3-v2-6-23ebb864fcc1@arm.com> <20250702144028.GY794930@e132581.arm.com> Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20250702144028.GY794930@e132581.arm.com> X-ClientProxiedBy: LO4P265CA0205.GBRP265.PROD.OUTLOOK.COM (2603:10a6:600:318::19) To GV1PR08MB10521.eurprd08.prod.outlook.com (2603:10a6:150:163::20) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-TrafficTypeDiagnostic: GV1PR08MB10521:EE_|PAVPR08MB9579:EE_|AMS0EPF00000197:EE_|AM9PR08MB6146:EE_ X-MS-Office365-Filtering-Correlation-Id: 1690987c-3938-434e-dd7e-08ddb984a4b8 X-LD-Processed: f34e5979-57d9-4aaa-ad4d-b122a662184d,ExtAddr,ExtAddr x-checkrecipientrouted: true NoDisclaimer: true X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam-Untrusted: BCL:0;ARA:13230040|7416014|376014|366016|1800799024; X-Microsoft-Antispam-Message-Info-Original: =?us-ascii?Q?EFOtZUGxH6SNIG0oXvClo491yMPV8CRCZz3v0Nk20fjA1w/yU9c20w3aVGro?= =?us-ascii?Q?hbp13Iyz/+RwkLqhHCmGJkOXmTtPVqdvOXWPGKMYWT1cLFOu1dqYbZ3Hh1jF?= =?us-ascii?Q?J2Kpv3n7P84uZZz1iDKbqOAsNA2kPibG/jhYI97xC267pgdsCjMLXQ+XAvvL?= =?us-ascii?Q?m3mmsM2OB/W+f4hp2WfAQEP5ByvnaM7xaN9UjLvFYPA3xqLx3XrW71Ntrocv?= =?us-ascii?Q?J6nsdw3CbldSweGjYixm9WoRsNWXd7wEZfgIXuNtEQ8ubsnty3Pe4k7gDuJ3?= =?us-ascii?Q?0AJuOUTYE4RBDwowABY3sddS/+pb5Vkr+uvD/Nafj/6uqLphIYk177WK8jsT?= =?us-ascii?Q?QdC0Xkw35oJpWGO6RJaja7hja8UeVyVBf/pVPj3gwnKtzM0pgy7aN+mVwEil?= =?us-ascii?Q?1WKEYPai9c36hXkU/+Ci1NaiQfQ+E1sBdx+3gumHJcSFbpKmJYk07egVSwHY?= =?us-ascii?Q?594NBGouhn0rHmCm7rbrC7gWr8yCbqG+eSSz5TMnx3n64u5WtQ/c0tWyKtix?= =?us-ascii?Q?I0i0dPZLCNMnpQjayPWmhx8ABoRNT+s2JsijXgaDLmkeH8T/c3vcrYElmc9O?= =?us-ascii?Q?cTYfqXqIvO89RMnC+8ZMXWJzameXwgCzdIkL4diALQqkj33ahpSDSJ1TKl/W?= =?us-ascii?Q?oDCzstyTmKk15B/2zKw5UyF4FSzKzjgpfFqDh4oDB0Oen5xUyrNT1JuNee/y?= =?us-ascii?Q?vcS0hHy2asFpF6sKvlPVBxMCD8cRROlHFBYQsWhBDU2t8ENFgO7qUDvbN6MK?= =?us-ascii?Q?MnKFbqwZ0sY0ZMnOgVwFujDpHSvSjV4wQQM5a0zU7Nw8Rkl6x8EyX9ZrDn1F?= =?us-ascii?Q?z5Ftv8GeEveECR8zoMA7C/d4tXxFLOiLmDuQYKUszMfOlAbYubB16EWgrB/L?= =?us-ascii?Q?76GuXBIPY6yIs9o8s9a4xGIQ7bIyp9yHEnppZXCUlz+lnBW0XYhOP5iy216I?= =?us-ascii?Q?J4Dc8BB8ndPMk2PRJU/Ss6sr5JjYENCSfBtmJisIIVo+674uBP+40srZPovI?= =?us-ascii?Q?ViKR2796iK5b1TAK2oOM8pnhKGCXk5ZnBclXIsWrrZolc9fF4ZZHQbIR32O6?= =?us-ascii?Q?pA1cGUva4N6U2V4E+eUDn7qPIv9WatYWnn621UTcaJfgwricKuStuLfHalWL?= =?us-ascii?Q?j2Lrqt4Ns/y5/VsAnrPb/UzjjB8u6XIld+0S3zd1TGAKCBST4E51Qx3NPsEM?= =?us-ascii?Q?4P8RcTDvmAsGFIPP2mk/xhc4qBYyqudDNW/8OscvF3xYmNOrmRN+0d4gwlXQ?= =?us-ascii?Q?D6Shn2+BWop2GTwjiDwxhtgYscYjq3nH3CcXvGuqPBKb6Sd6AruE5ckRKyva?= =?us-ascii?Q?J1ACaFN7tP4joRmG9INs4jEYrusFhPqOjBND5cV/3AOMDxx5lGloF2yjiIAx?= =?us-ascii?Q?jbIoInf9BL+5goce0uqGTBPW0Wm12Ko/OQxB0+VBdh0FsT+9rtt/tC5a0cAf?= =?us-ascii?Q?SNg1vhLvdsQ=3D?= X-Forefront-Antispam-Report-Untrusted: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:GV1PR08MB10521.eurprd08.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230040)(7416014)(376014)(366016)(1800799024);DIR:OUT;SFP:1101; X-MS-Exchange-Transport-CrossTenantHeadersStamped: PAVPR08MB9579 X-EOPAttributedMessage: 0 X-MS-Exchange-Transport-CrossTenantHeadersStripped: AMS0EPF00000197.eurprd05.prod.outlook.com X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id-Prvs: e2f1f916-1033-4312-246a-08ddb9849022 X-Microsoft-Antispam: BCL:0;ARA:13230040|82310400026|35042699022|376014|7416014|1800799024|36860700013|14060799003; X-Microsoft-Antispam-Message-Info: =?us-ascii?Q?kshE6x16+1G8KAgq1GLMrRV/fLNwLZ5dXux7zGEbZgQVap8iHDNj+X8CuIuJ?= =?us-ascii?Q?y+mFDYRG64g7LDpz22KkIS0H51FyE6jVig7mAi33qzn248iD9NL9KdF63L5r?= =?us-ascii?Q?B9bBp/2Z6C9CdFEdFy6EkqBZGmZNtehgHuaFw4qrHRI8Y7COMKY9x6vPOlZP?= =?us-ascii?Q?t53g9je2XRp3PKiNPlbJZr3ooqaSAQ3D8H/CF97okCgNRgu/ZNDxCXO3Pb7i?= =?us-ascii?Q?EvJPW5FksaQzW3/MPIYQbTKkB1RuIuAz3ggMC9gAlYB+j8ax+/lAZrrWRTxr?= =?us-ascii?Q?ehKJ7Xl9c32jnLnnQAJ/HxVQ2TNKr7AA/NhlNoig1/6+5mylvX+niKSDAYNp?= =?us-ascii?Q?N+l6E0kztM4eYd49rslcnl/Izfa1UMHzFCu6hcr7/jX3MNuxmIPdIN0Ps1K4?= =?us-ascii?Q?Em3tIKgu7dswgm3gucHhy3ZamySfpZ3in0YSxL9MqbnMAWG7nOo46l+PHrBk?= =?us-ascii?Q?7qfQRx/77HSW56JRGju7TAxeJM1c6Gsv9wB/noU9xOJAT5uMC+9WGji0TEec?= =?us-ascii?Q?yK0+IGEvXs5XHGe76pGCbu6S1WmamGhfRlHWLSQY+My2GqjJgtaCGBYaKnWQ?= =?us-ascii?Q?prrqNJud7/vg8TIUR7pLfEDVv1zqc4tmllrbeh3pDBCNzRdVbmQBT1/Xhd7W?= =?us-ascii?Q?uIHXx2zREsujyuqHHcY4ALA43QWc9c2rYnxq7qTfl4/1g/rF73eHhvPgNj0K?= =?us-ascii?Q?5cN21C/J+eGEyyjxeV0Xxiq3yRvPWHiTmHzGoFjtdS5XXEzJyry2BiXfYDQt?= =?us-ascii?Q?bdJeJHf8wXfnA0pQZPvZYnlMtubT7hzZprglRp3XBDdT/j01kKVGKy9F6F9L?= =?us-ascii?Q?J041F9MLDZZJsM3Cxd6bpnYGVT0DWCm+skdLitukl+KyyQaIF3ZjU9BQAce5?= =?us-ascii?Q?j1THjUETbe9KslWGqXn6w4QJVHNy4hcxhngtRebwZRAq1YLlIf3/UGSH5Sfm?= =?us-ascii?Q?gWMM9ZRWzJL9x90V0aapg7wjt1gpUxxNuwxtV60Mva9NCgQ5XUSXT9kt+Wwi?= =?us-ascii?Q?u7Jso4mEo/8UuW5bPxs57v42h/89Ne4Vai3G0T+Xpn6icW4VGH1ZwD78fLzp?= =?us-ascii?Q?bYLvfNFeVED3Rv85rx31fFabOh+ykU4UyRMdYdlLNe/rfXxl4MeDB4y+WNxf?= =?us-ascii?Q?ugeJkl0pp0Gjp5a2l8c2eH678cvDuXBhh24MGzAgz5gMxVIaBrWclkNcljvS?= =?us-ascii?Q?V6f9Jq2/dTXyU+bwrTjaNLCWtS4SZCHHtntrbn/a4VEjwqtlbEaK+ymgiLN4?= =?us-ascii?Q?9avNjlj/hzYQD8Ynn/wlJgYXjUfY5mSDW/ruK34JyR1WLUkaua00SIkgbdeQ?= =?us-ascii?Q?hnxPjCc2Ma8/jscGPwcdERb1LD/DyuqYkO53RKoo+GkTLf2MW7hOhJJIOjzd?= =?us-ascii?Q?bgjwpoL/7nHZU4rkDVdN0rDSmTEY2npFOMZRbaKWW4o9DI6IKP/pS/NPTS27?= =?us-ascii?Q?KC2nriL429rzNnx73TEJG3RI6l+/sdgpAFMb8+Mt2qxrRTkV01l9lb34MSKT?= =?us-ascii?Q?jo6YaC77x11bEeRdIOrGRxqkJrOiYfk8hh3V?= X-Forefront-Antispam-Report: CIP:4.158.2.129;CTRY:GB;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:outbound-uk1.az.dlp.m.darktrace.com;PTR:InfoDomainNonexistent;CAT:NONE;SFS:(13230040)(82310400026)(35042699022)(376014)(7416014)(1800799024)(36860700013)(14060799003);DIR:OUT;SFP:1101; X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 02 Jul 2025 16:22:30.5944 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 1690987c-3938-434e-dd7e-08ddb984a4b8 X-MS-Exchange-CrossTenant-Id: f34e5979-57d9-4aaa-ad4d-b122a662184d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=f34e5979-57d9-4aaa-ad4d-b122a662184d;Ip=[4.158.2.129];Helo=[outbound-uk1.az.dlp.m.darktrace.com] X-MS-Exchange-CrossTenant-AuthSource: AMS0EPF00000197.eurprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: AM9PR08MB6146 > On Wed, Jul 02, 2025 at 12:05:10PM +0100, Yeoreum Yun wrote: > > [...] > > > > @@ -445,13 +445,37 @@ static int etm4_enable_trace_unit(struct etmv4_drvdata *drvdata) > > > etm4x_relaxed_write32(csa, TRCRSR_TA, TRCRSR); > > > > > > etm4x_allow_trace(drvdata); > > > + > > > + /* > > > + * According to software usage PKLXF in Arm ARM (ARM DDI 0487 L.a), > > > + * execute a Context synchronization event to guarantee the trace unit > > > + * will observe the new values of the System registers. > > > + */ > > > + if (!csa->io_mem) > > > + isb(); > > > + > > > > But, when write to SYS_TRFCR_EL1 in etm4x_allow_trace(), it already does > > isb(). Is it redundant? > > Good point. It is not sufficient. As a system register writing in > kvm_tracing_set_el1_configuration(), this is why adds a ISB here. Ah, I missed the write_sysreg_s() doesn't include isb(). Sorry to make noise.. -- Sincerely, Yeoreum Yun