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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 SA2PEPF000015CC.mail.protection.outlook.com (10.167.241.202) 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 17:21:28 +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 11:21:23 -0600 From: K Prateek Nayak To: CC: "Gautham R. Shenoy" , K Prateek Nayak , Michal Simek , "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 14/14] microblaze/thread_info: Introduce TIF_NOTIFY_IPI flag Date: Tue, 20 Feb 2024 22:44:57 +0530 Message-ID: <20240220171457.703-15-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: SA2PEPF000015CC:EE_|BN9PR12MB5289:EE_ X-MS-Office365-Filtering-Correlation-Id: 9b945c27-2258-426b-bbd7-08dc32385fa3 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 17:21:28.3422 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 9b945c27-2258-426b-bbd7-08dc32385fa3 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: SA2PEPF000015CC.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: BN9PR12MB5289 Add support for TIF_NOTIFY_IPI on MicroBlaze. 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: Michal Simek 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: linux-kernel@vger.kernel.org Cc: linux-pm@vger.kernel.org Signed-off-by: K Prateek Nayak --- arch/microblaze/include/asm/thread_info.h | 2 ++ 1 file changed, 2 insertions(+) diff --git a/arch/microblaze/include/asm/thread_info.h b/arch/microblaze/include/asm/thread_info.h index a0ddd2a36fb9..953a334bb4fe 100644 --- a/arch/microblaze/include/asm/thread_info.h +++ b/arch/microblaze/include/asm/thread_info.h @@ -103,6 +103,7 @@ static inline struct thread_info *current_thread_info(void) #define TIF_SINGLESTEP 4 #define TIF_NOTIFY_SIGNAL 5 /* signal notifications exist */ #define TIF_MEMDIE 6 /* is terminating due to OOM killer */ +#define TIF_NOTIFY_IPI 7 /* Pending IPI on TIF_POLLLING idle CPU */ #define TIF_SYSCALL_AUDIT 9 /* syscall auditing active */ #define TIF_SECCOMP 10 /* secure computing */ @@ -115,6 +116,7 @@ static inline struct thread_info *current_thread_info(void) #define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED) #define _TIF_SINGLESTEP (1 << TIF_SINGLESTEP) #define _TIF_NOTIFY_SIGNAL (1 << TIF_NOTIFY_SIGNAL) +#define _TIF_NOTIFY_IPI (1 << TIF_NOTIFY_IPI) #define _TIF_POLLING_NRFLAG (1 << TIF_POLLING_NRFLAG) #define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT) #define _TIF_SECCOMP (1 << TIF_SECCOMP)