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Peter Anvin" , Wanpeng Li , Vitaly Kuznetsov , Mark Rutland , Daniel Lezcano , Richard Cochran , kvm@vger.kernel.org, netdev@vger.kernel.org, Stephen Boyd Subject: [PATCH v3 2/8] timekeeping: Add clocksource ID to struct system_counterval_t Date: Thu, 1 Feb 2024 02:04:47 +0100 Message-Id: <20240201010453.2212371-3-peter.hilber@opensynergy.com> X-Mailer: git-send-email 2.40.1 In-Reply-To: <20240201010453.2212371-1-peter.hilber@opensynergy.com> References: <20240201010453.2212371-1-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: DB8EUR05FT021:EE_|FRYP281MB0032:EE_ X-MS-Office365-Filtering-Correlation-Id: 1cfb6228-dfca-482c-2d12-08dc22c1ea60 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)(136003)(346002)(376002)(396003)(39840400004)(230922051799003)(451199024)(186009)(1800799012)(64100799003)(82310400011)(46966006)(36840700001)(41300700001)(54906003)(36756003)(47076005)(36860700001)(316002)(1076003)(2616005)(70586007)(70206006)(6916009)(42186006)(966005)(5660300002)(478600001)(7416002)(86362001)(2906002)(8676002)(83380400001)(26005)(8936002)(336012)(4326008)(44832011)(40480700001)(81166007)(36900700001);DIR:OUT;SFP:1102; X-OriginatorOrg: opensynergy.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 01 Feb 2024 01:05:43.4878 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 1cfb6228-dfca-482c-2d12-08dc22c1ea60 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: DB8EUR05FT021.eop-eur05.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: FRYP281MB0032 X-TM-AS-ERS: 104.47.7.168-0.0.0.0 X-TMASE-Version: StarCloud-1.3-9.1.1015-28152.007 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: 5b6ea32b-704b-42a3-a7c3-7ea9119431c2-0-0-200-0 X-TM-Deliver-Signature: 31549B26C2C12E238FE761D6A9ABD8F8 X-TM-Addin-Auth: ySrecwAZ6T0lqY5ygKpJic7UH9JZ0ONTg5B4LEUWxWxmxrX+NxzTqbuy9T/ B1YOtZV39v3RabXTypwHnahUBDDHv+VX35DBWxkf24fZB6OyGUUSw/PxMvOEAvy8Lv9e8M+ZKDO jBpsIskkODLgPyD+kxnxbAkpqXZGRK8cXaKG7PBFJJcgwgVNTNO1gHkIwShrHK4jNuGCJL5CVgx pRIPNLW4gp6wYLaovr+TFdELhcEfa3rIL/MdnxOnxdAHgtWR47GQgwhOwc0/J8Kdfmh6vsNuVWu qBmXceFOihjAAs2U/tqCUdSL6mv/9Vc/MReA.KDDjpmL4E1kvs5qcC+MdSieM0sfsL3FwnH/oBD tVaCHFlDpgX0PSjZUwqIx6XdLnB60NJRAbT/YOa0CS2Fuooel4jWkh32+eVuvsbQl7YYGMwNneh +7pVeUj28tCQm0KwxQm2KQQQvu3yfLAEthSRVBI5RvkzECC7XqT9EOeZj1iR0u2xGo/rRq9rMUc A9Jg0LkFCAbHtLzmUsfeKO6kgvDhUFS7QCz+TzH5pAe6Xpj8ER8e0tqQYj18N+ahwTvF6bU3KQb 8DopGyCYin6DICZfAOATZzqaP1PX/ZRdRy/fAB/r7TMs/EkydQ9r2tz7YhiHqdUwZh7IS309KcH bjyQ== X-TM-Addin-ProductCode: EMS DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=opensynergy.com; s=TM-DKIM-20210503141657; t=1706749583; bh=VEEICBI9hb85ucOIjDdO+txOgLqKBI+xAIKrGkmsBbI=; l=1732; h=From:To:Date; b=yVBUe2SqPjElDv94s/Rg71vp8wnuw5LF6WDKlMqqCdt+hab6nWGOcT57byD6WKNP1 cWzGJ9G+2IndCT+lUuxAIEtch5gOfm/lZ/uXCQ6sfBgwlq/jCcqHGGQa1nQtTd5eEx o6T3AJd0ryAMy3rwx1y9bDx5he3rtYypPkZtd1hIUwIMvy2Piomov1896bcbD0Fl13 WZ66wqj1nAubKgueqMkq+BG84pt0XDA6DXd+cIlk7B9wHnyv39APn/RJFYOPe0StJI 8PWq2IlR8E1qDKxn9Wt3YJkpQX4B0C3OdlQ8DppPzYVAfhQ5XI9Ih53GedqlTNA+8U S0b+mMa053b5w== 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 which 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/20231218073849.35294-1-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 7c43e98cf211..ca234fa4cc04 100644 --- a/include/linux/timekeeping.h +++ b/include/linux/timekeeping.h @@ -273,10 +273,15 @@ 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; }; /*