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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 SA2PEPF000015C8.mail.protection.outlook.com (10.167.241.198) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.20.7292.25 via Frontend Transport; Tue, 20 Feb 2024 17:20:03 +0000 Received: from BLR5CG134614W.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 15.1.2507.35; Tue, 20 Feb 2024 11:19:57 -0600 From: K Prateek Nayak To: CC: "Gautham R. Shenoy" , K Prateek Nayak , "David S. Miller" , "Rafael J. Wysocki" , Daniel Lezcano , Ingo Molnar , Peter Zijlstra , "Juri Lelli" , Vincent Guittot , Dietmar Eggemann , Steven Rostedt , Ben Segall , Mel Gorman , Daniel Bristot de Oliveira , "Valentin Schneider" , , Subject: [RFC PATCH 10/14] sparc/thread_info: Introduce TIF_NOTIFY_IPI flag Date: Tue, 20 Feb 2024 22:44:53 +0530 Message-ID: <20240220171457.703-11-kprateek.nayak@amd.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20240220171457.703-1-kprateek.nayak@amd.com> References: <20240220171457.703-1-kprateek.nayak@amd.com> Precedence: bulk X-Mailing-List: linux-pm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-ClientProxiedBy: SATLEXMB04.amd.com (10.181.40.145) To SATLEXMB04.amd.com (10.181.40.145) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SA2PEPF000015C8:EE_|CY8PR12MB7193:EE_ X-MS-Office365-Filtering-Correlation-Id: 1013d6c4-91f1-46ff-0e25-08dc32382d0b 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)(36860700004)(46966006)(40470700004); DIR:OUT; SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 20 Feb 2024 17:20:03.4399 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 1013d6c4-91f1-46ff-0e25-08dc32382d0b 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: SA2PEPF000015C8.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: CY8PR12MB7193 Add support for TIF_NOTIFY_IPI on SPARC. With TIF_NOTIFY_IPI, a sender sending an IPI to an idle CPU in TIF_POLLING mode will set the TIF_NOTIFY_IPI flag in the target's idle tasks's thread_info to pull the CPU out of idle, as opposed to setting TIF_NEED_RESCHED previously. This avoids spurious calls to schedule_idle() in cases where an IPI does not necessarily wake up a task on the idle CPU. Cc: "David S. Miller" Cc: "Rafael J. Wysocki" Cc: Daniel Lezcano Cc: Ingo Molnar Cc: Peter Zijlstra Cc: Juri Lelli Cc: Vincent Guittot Cc: Dietmar Eggemann Cc: Steven Rostedt Cc: Ben Segall Cc: Mel Gorman Cc: Daniel Bristot de Oliveira Cc: Valentin Schneider Cc: K Prateek Nayak Cc: sparclinux@vger.kernel.org Cc: linux-kernel@vger.kernel.org Cc: linux-pm@vger.kernel.org Signed-off-by: K Prateek Nayak --- arch/sparc/include/asm/thread_info_32.h | 2 ++ arch/sparc/include/asm/thread_info_64.h | 2 ++ 2 files changed, 4 insertions(+) diff --git a/arch/sparc/include/asm/thread_info_32.h b/arch/sparc/include/asm/thread_info_32.h index 45b4955b253f..f538ede526d1 100644 --- a/arch/sparc/include/asm/thread_info_32.h +++ b/arch/sparc/include/asm/thread_info_32.h @@ -105,6 +105,7 @@ register struct thread_info *current_thread_info_reg asm("g6"); #define TIF_NEED_RESCHED 3 /* rescheduling necessary */ #define TIF_RESTORE_SIGMASK 4 /* restore signal mask in do_signal() */ #define TIF_NOTIFY_SIGNAL 5 /* signal notifications exist */ +#define TIF_NOTIFY_IPI 6 /* Pending IPI on TIF_POLLLING idle CPU */ #define TIF_USEDFPU 8 /* FPU was used by this task * this quantum (SMP) */ #define TIF_POLLING_NRFLAG 9 /* true if poll_idle() is polling @@ -117,6 +118,7 @@ register struct thread_info *current_thread_info_reg asm("g6"); #define _TIF_SIGPENDING (1<