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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 SA2PEPF000015C6.mail.protection.outlook.com (10.167.241.196) 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 17:19:19 +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 11:19:11 -0600 From: K Prateek Nayak To: CC: "Gautham R. Shenoy" , K Prateek Nayak , Michael Ellerman , "Nicholas Piggin" , Christophe Leroy , Aneesh Kumar K.V , "Naveen N. Rao" , "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 , Andrew Donnellan , Nicholas Miehlbradt , , Subject: [RFC PATCH 08/14] powerpc/thread_info: Introduce TIF_NOTIFY_IPI flag Date: Tue, 20 Feb 2024 22:44:51 +0530 Message-ID: <20240220171457.703-9-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: SA2PEPF000015C6:EE_|SN7PR12MB6715:EE_ X-MS-Office365-Filtering-Correlation-Id: 298d8946-e44d-453c-b049-08dc323812b2 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)(40470700004)(46966006);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 20 Feb 2024 17:19:19.2088 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 298d8946-e44d-453c-b049-08dc323812b2 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: SA2PEPF000015C6.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SN7PR12MB6715 Add support for TIF_NOTIFY_IPI on PowerPC. 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: Michael Ellerman Cc: Nicholas Piggin Cc: Christophe Leroy Cc: "Aneesh Kumar K.V" Cc: "Naveen N. Rao" 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: Andrew Donnellan Cc: K Prateek Nayak Cc: Nicholas Miehlbradt Cc: linuxppc-dev@lists.ozlabs.org Cc: linux-kernel@vger.kernel.org Cc: linux-pm@vger.kernel.org Signed-off-by: K Prateek Nayak --- arch/powerpc/include/asm/thread_info.h | 2 ++ 1 file changed, 2 insertions(+) diff --git a/arch/powerpc/include/asm/thread_info.h b/arch/powerpc/include/asm/thread_info.h index bf5dde1a4114..b48db55192e0 100644 --- a/arch/powerpc/include/asm/thread_info.h +++ b/arch/powerpc/include/asm/thread_info.h @@ -103,6 +103,7 @@ void arch_setup_new_exec(void); #define TIF_PATCH_PENDING 6 /* pending live patching update */ #define TIF_SYSCALL_AUDIT 7 /* syscall auditing active */ #define TIF_SINGLESTEP 8 /* singlestepping active */ +#define TIF_NOTIFY_IPI 9 /* Pending IPI on TIF_POLLLING idle CPU */ #define TIF_SECCOMP 10 /* secure computing */ #define TIF_RESTOREALL 11 /* Restore all regs (implies NOERROR) */ #define TIF_NOERROR 12 /* Force successful syscall return */ @@ -129,6 +130,7 @@ void arch_setup_new_exec(void); #define _TIF_PATCH_PENDING (1<