From patchwork Fri Dec 15 22:06:06 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Peter Hilber X-Patchwork-Id: 13495114 Received: from refb02.tmes.trendmicro.eu (refb02.tmes.trendmicro.eu [18.185.115.60]) (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 8653718EBE for ; Fri, 15 Dec 2023 22:22:11 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=opensynergy.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=opensynergy.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=opensynergy.com header.i=@opensynergy.com header.b="UrFihNp8" Received: from 104.47.11.169_.trendmicro.com (unknown [172.21.10.226]) by refb02.tmes.trendmicro.eu (Postfix) with ESMTPS id 3CEEF10A4DCC6 for ; Fri, 15 Dec 2023 22:06:43 +0000 (UTC) Received: from 104.47.11.169_.trendmicro.com (unknown [172.21.203.211]) by repost01.tmes.trendmicro.eu (Postfix) with SMTP id 7F14A10000D1C; Fri, 15 Dec 2023 22:06:35 +0000 (UTC) X-TM-MAIL-RECEIVED-TIME: 1702677993.924000 X-TM-MAIL-UUID: 699be982-236a-4761-80ca-85345b514ec2 Received: from DEU01-FR2-obe.outbound.protection.outlook.com (unknown [104.47.11.169]) by repre01.tmes.trendmicro.eu (Trend Micro Email Security) with ESMTPS id E1DFA10000E34; Fri, 15 Dec 2023 22:06:33 +0000 (UTC) ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=UuuUnYpMwXxSLVv/iN+7Al9bP4zmachHgn7QF4Eg8+qWs8VZkeZvTuyzeZlek6qxS97LONQLHGLQmgfUrj+bJysvFgjKLV2IHyz8Wxw/RAYe9pL0rqw0pv9t/bKJGcbA10/+TNFAS4loGW44KIy/DfxpNd0MDNIrUUyFvrReLhkXoZXsyqnJPcqUBWqVndwPWcAgjJkHkI+xPEPJoT0WlmedpYkhzOq+oJ9CAC6RPXZK8vGdYt1Ue+0k0uXKW2dlxhE/L1KMh2J30tiKilgQ2GsC3VHXAWFEuU3YXF/xabS/UIsXvC0+lDzXhkSFM9cFfGUWuMNzBRYJgaq16DUZTw== 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=n3VgXWgRtg/rFDFxEzHNoE8e1N/NnoOrbD/bAryhxmE=; b=U9SgLNh/uY/pPr9gZQLksMgKyoOFUymdqc8zQ2RgZCwponahJKL55++h7oYIb8B+/SgowbwULtGma2xFAuZmQlOFcFzpXtUcvIkJyv03zfhsyPjJiv/eZCMswGRt6vMNOsFyey3GFS9YWKCa3eANzrPSZxRWFnN3ry78xAAUPGhPhIqD8hI32ho1jCHQ9F20Py/gX8XaFqhijV3sbFG8nnnGjop/NGvABxcZ8P6HGpyucsL/+9tc6iU+9XUaSjKutA/uj8F/VDS4qmdlCch8uTUyvSrz5UpTRcUHCgRWABtotQP1LTYHrJ+Iy22cbSI8v/OgY3u/eil43kts7odYJw== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass (sender ip is 217.66.60.4) smtp.rcpttodomain=alien8.de smtp.mailfrom=opensynergy.com; dmarc=pass (p=reject sp=reject pct=100) action=none header.from=opensynergy.com; dkim=none (message not signed); arc=none (0) X-MS-Exchange-Authentication-Results: spf=pass (sender IP is 217.66.60.4) smtp.mailfrom=opensynergy.com; dkim=none (message not signed) header.d=none;dmarc=pass action=none header.from=opensynergy.com; Received-SPF: Pass (protection.outlook.com: domain of opensynergy.com designates 217.66.60.4 as permitted sender) receiver=protection.outlook.com; client-ip=217.66.60.4; helo=SR-MAIL-03.open-synergy.com; pr=C From: Peter Hilber To: linux-kernel@vger.kernel.org Cc: Peter Hilber , "D, Lakshmi Sowjanya" , Thomas Gleixner , jstultz@google.com, giometti@enneenne.com, corbet@lwn.net, andriy.shevchenko@linux.intel.com, "Dong, Eddie" , "Hall, Christopher S" , Marc Zyngier , linux-arm-kernel@lists.infradead.org, Sean Christopherson , Paolo Bonzini , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, "H. Peter Anvin" , Wanpeng Li , Vitaly Kuznetsov , Mark Rutland , Daniel Lezcano , Richard Cochran , kvm@vger.kernel.org, netdev@vger.kernel.org, Stephen Boyd Subject: [RFC PATCH v2 1/7] timekeeping: Add clocksource ID to struct system_counterval_t Date: Fri, 15 Dec 2023 23:06:06 +0100 Message-Id: <20231215220612.173603-2-peter.hilber@opensynergy.com> X-Mailer: git-send-email 2.40.1 In-Reply-To: <20231215220612.173603-1-peter.hilber@opensynergy.com> References: <20231215220612.173603-1-peter.hilber@opensynergy.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: AM6EUR05FT007:EE_|BEZP281MB2021:EE_ X-MS-Office365-Filtering-Correlation-Id: 63315aeb-092b-4706-5d21-08dbfdba1882 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:217.66.60.4;CTRY:DE;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:SR-MAIL-03.open-synergy.com;PTR:InfoDomainNonexistent;CAT:NONE;SFS:(13230031)(396003)(346002)(136003)(39840400004)(376002)(230922051799003)(451199024)(82310400011)(64100799003)(186009)(1800799012)(46966006)(36840700001)(47076005)(83380400001)(1076003)(2616005)(336012)(26005)(36860700001)(4326008)(8676002)(8936002)(5660300002)(44832011)(41300700001)(7416002)(2906002)(478600001)(966005)(42186006)(54906003)(70206006)(6916009)(316002)(70586007)(36756003)(81166007)(86362001)(40480700001)(36900700001);DIR:OUT;SFP:1102; X-OriginatorOrg: opensynergy.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 15 Dec 2023 22:06:31.9216 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 63315aeb-092b-4706-5d21-08dbfdba1882 X-MS-Exchange-CrossTenant-Id: 800fae25-9b1b-4edc-993d-c939c4e84a64 X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=800fae25-9b1b-4edc-993d-c939c4e84a64;Ip=[217.66.60.4];Helo=[SR-MAIL-03.open-synergy.com] X-MS-Exchange-CrossTenant-AuthSource: AM6EUR05FT007.eop-eur05.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: BEZP281MB2021 X-TM-AS-ERS: 104.47.11.169-0.0.0.0 X-TMASE-Version: StarCloud-1.3-9.1.1015-28060.002 X-TMASE-Result: 10--1.225700-4.000000 X-TMASE-MatchedRID: I6rpFm0lrcMEZ1mm50iAbgs6eGQ6Ral9EkUS8Erng9pzi8z2Fvgo+kp9 UxJnBl3FHDf9l7U5F7SnyNbHJWoNRbkeKW6KfnZEiu6u4shZ+fHcHWFKCmADc2shUDcgZ8ILoMQ NBr66IpTrLAe8bL+cp6EWqZPwachiifyRQLERY0pCPQBD3xA/3aODSWu0oxbK6gfKtA7Yhlrtmy EvxwC5ZF4L45p2p0pV3+6k97GsyDgqZdHEYvGr9R+AJsLlsQNEJEWB6QUw47pwgry9e+z6K02xv NT0DEAe X-TMASE-XGENCLOUD: e75e3261-40d8-4d1c-aac9-f728c685c5cd-0-0-200-0 X-TM-Deliver-Signature: 4B42FBC32BA0165278B8D7FEBEE10FBB X-TM-Addin-Auth: lofU8dU7CdFAhD8V9sagn575AEfwI3X3ytRWn+nIQZBRhSeZKXpgWtk8ubW QsBx7yYGxPJkY5F/LuMy6srgWd65Qo9+qbrJx0kkJwJbZ7I308Dkk+O54/YXj5rQOiQ8GX33POb tI+wMsWLHcGhZAb2HqQZ2d8iE9WKWeV0fo06u2vUq5+u9LpVu9Q0EXqKR7IBL9Pbpzy6TVoJHxO ZVKdGzMhvoYlpRbbpEAAF7n6HO5Zz/ESbRSFRAKocnepMuUrzQkaY9FFpK1+mNYwquPne2LevC8 XXE8/nOWtZqmvQM=.bPpDQlzcOcNoYt9A5H77a9CR386jDRBzQLsgklYU2XMC+ekPsNsfD1BP4A Jcb6vPqH/K8HQnLDHrWQFe4mpSdqnShAFqd3aOLNfdPEO08subNevpkOxsjEM6cgsECDXl3VXul ORxePK6hlb+HjiJdpifFwSMaiK8h6Up9Y2F3cMoK3utczzCmVZAJBN34jqyVWgruSlZ5Sasdk+t vZIJdF/oMam1o+kAAkKUrZS4lHhAy3jlxW0GqQ/B1RPFKHO+3x2EIAk2DQRfLe6551X6wH9YczS n2itYa2/OSiyu5Ng1EKUPUVwBELXWXr/49ibhsRpDc7fUnoMUDHJ+ClcjLQ== X-TM-Addin-ProductCode: EMS DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=opensynergy.com; s=TM-DKIM-20210503141657; t=1702677995; bh=O8MqEDHj5ZPOM57SiFoYrD63DRexH/0RpOMiWwTA4kQ=; l=1727; h=From:To:Date; b=UrFihNp8K98r1vYbUF27TVe5ZLFY893mdg+6qxxVieR3os+tsgkRTv3vd47WKCotM VO7if4ZlAgEs4+ifyEtmIYcB22F8y8jQdJT8vYcvF5zybfsQIpxQT+xrEiVIcb3xng kAL2FqO7bJlKS0P0gl1TbsxFQM1ZgWMR8/G9Hb/GonrRcu83orW6RAGcshIR0JQ/5o jg7tkio3dvaVTLF8pdrnvBRkh6RX4TJDP5eXRwKfqhqKbraoJRrN3wssNqJkbDYqmn OquQ5QckNTMao5/XvlIDEadWKIwwWJl9nrOp8OJaJGYGjFydGdZXrB294q6wuoBfBw ocH7CA6JWChBg== X-Patchwork-State: RFC Clocksource pointers can be problematic to obtain for drivers which are not clocksource drivers themselves. In particular, the RFC virtio_rtc driver [1] would require a new helper function to obtain a pointer to the Arm Generic Timer clocksource. The ptp_kvm driver also required a similar workaround. Add a clocksource ID member to struct system_counterval_t, which in the future shall identify the clocksource, and shall replace the struct clocksource * member. By this, get_device_system_crosststamp() callers (such as virtio_rtc and ptp_kvm) will be able to supply easily accessible clocksource ids instead of clocksource pointers. [1] https://lore.kernel.org/lkml/20230818012014.212155-1-peter.hilber@opensynergy.com/ Signed-off-by: Peter Hilber --- Notes: v2: - Refer to clocksource IDs as such in comments (Thomas Gleixner). include/linux/timekeeping.h | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/include/linux/timekeeping.h b/include/linux/timekeeping.h index fe1e467ba046..74dc7c8b036f 100644 --- a/include/linux/timekeeping.h +++ b/include/linux/timekeeping.h @@ -272,10 +272,15 @@ struct system_device_crosststamp { * @cycles: System counter value * @cs: Clocksource corresponding to system counter value. Used by * timekeeping code to verify comparibility of two cycle values + * @cs_id: Clocksource ID corresponding to system counter value. To be + * used instead of cs in the future. + * The default ID, CSID_GENERIC, does not identify a specific + * clocksource. */ struct system_counterval_t { u64 cycles; struct clocksource *cs; + enum clocksource_ids cs_id; }; /*