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charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" Problem: If scheduler is already stopped by the time sched_entity is released and entity's job_queue not empty I encountred a hang in drm_sched_entity_flush. This is because drm_sched_entity_is_idle never becomes false. Fix: In drm_sched_fini detach all sched_entities from the scheduler's run queues. This will satisfy drm_sched_entity_is_idle. Also wakeup all those processes stuck in sched_entity flushing as the scheduler main thread which wakes them up is stopped by now. v2: Reverse order of drm_sched_rq_remove_entity and marking s_entity as stopped to prevent reinserion back to rq due to race. Signed-off-by: Andrey Grodzovsky --- drivers/gpu/drm/scheduler/sched_main.c | 31 +++++++++++++++++++++++++++++++ 1 file changed, 31 insertions(+) diff --git a/drivers/gpu/drm/scheduler/sched_main.c b/drivers/gpu/drm/scheduler/sched_main.c index 908b0b5..c6b7947 100644 --- a/drivers/gpu/drm/scheduler/sched_main.c +++ b/drivers/gpu/drm/scheduler/sched_main.c @@ -897,9 +897,40 @@ EXPORT_SYMBOL(drm_sched_init); */ void drm_sched_fini(struct drm_gpu_scheduler *sched) { + int i; + struct drm_sched_entity *s_entity; if (sched->thread) kthread_stop(sched->thread); + /* Detach all sched_entites from this scheduler once it's stopped */ + for (i = DRM_SCHED_PRIORITY_COUNT - 1; i >= DRM_SCHED_PRIORITY_MIN; i--) { + struct drm_sched_rq *rq = &sched->sched_rq[i]; + + if (!rq) + continue; + + /* Loop this way because rq->lock is taken in drm_sched_rq_remove_entity */ + spin_lock(&rq->lock); + while ((s_entity = list_first_entry_or_null(&rq->entities, + struct drm_sched_entity, + list))) { + spin_unlock(&rq->lock); + + /* Prevent reinsertion and remove */ + spin_lock(&s_entity->rq_lock); + s_entity->stopped = true; + drm_sched_rq_remove_entity(rq, s_entity); + spin_unlock(&s_entity->rq_lock); + + spin_lock(&rq->lock); + } + spin_unlock(&rq->lock); + + } + + /* Wakeup everyone stuck in drm_sched_entity_flush for this scheduler */ + wake_up_all(&sched->job_scheduled); + /* Confirm no work left behind accessing device structures */ cancel_delayed_work_sync(&sched->work_tdr); -- 2.7.4 _______________________________________________ dri-devel mailing list dri-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/dri-devel From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.5 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,MSGID_FROM_MTA_HEADER,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5EE03C433DB for ; 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Wed, 17 Feb 2021 21:59:48 +0000 From: Andrey Grodzovsky To: dri-devel@lists.freedesktop.org, amd-gfx@lists.freedesktop.org, ckoenig.leichtzumerken@gmail.com Subject: [PATCH v2] drm/scheduler: Fix hang when sched_entity released Date: Wed, 17 Feb 2021 16:59:41 -0500 Message-Id: <1613599181-9492-1-git-send-email-andrey.grodzovsky@amd.com> X-Mailer: git-send-email 2.7.4 X-Originating-IP: [2607:fea8:3edf:49b0:1c58:abdf:5837:609f] X-ClientProxiedBy: YT1PR01CA0095.CANPRD01.PROD.OUTLOOK.COM (2603:10b6:b01:2d::34) To SN6PR12MB4623.namprd12.prod.outlook.com (2603:10b6:805:e9::17) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from agrodzovsky-All-Series.hitronhub.home (2607:fea8:3edf:49b0:1c58:abdf:5837:609f) by YT1PR01CA0095.CANPRD01.PROD.OUTLOOK.COM (2603:10b6:b01:2d::34) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256) id 15.20.3846.38 via Frontend Transport; Wed, 17 Feb 2021 21:59:48 +0000 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-HT: Tenant X-MS-Office365-Filtering-Correlation-Id: 81fc0c3b-5ad0-4f5f-d061-08d8d38f580c X-MS-TrafficTypeDiagnostic: SN1PR12MB2398: X-MS-Exchange-Transport-Forked: True X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:663; 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charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: amd-gfx-bounces@lists.freedesktop.org Sender: "amd-gfx" Problem: If scheduler is already stopped by the time sched_entity is released and entity's job_queue not empty I encountred a hang in drm_sched_entity_flush. This is because drm_sched_entity_is_idle never becomes false. Fix: In drm_sched_fini detach all sched_entities from the scheduler's run queues. This will satisfy drm_sched_entity_is_idle. Also wakeup all those processes stuck in sched_entity flushing as the scheduler main thread which wakes them up is stopped by now. v2: Reverse order of drm_sched_rq_remove_entity and marking s_entity as stopped to prevent reinserion back to rq due to race. Signed-off-by: Andrey Grodzovsky --- drivers/gpu/drm/scheduler/sched_main.c | 31 +++++++++++++++++++++++++++++++ 1 file changed, 31 insertions(+) diff --git a/drivers/gpu/drm/scheduler/sched_main.c b/drivers/gpu/drm/scheduler/sched_main.c index 908b0b5..c6b7947 100644 --- a/drivers/gpu/drm/scheduler/sched_main.c +++ b/drivers/gpu/drm/scheduler/sched_main.c @@ -897,9 +897,40 @@ EXPORT_SYMBOL(drm_sched_init); */ void drm_sched_fini(struct drm_gpu_scheduler *sched) { + int i; + struct drm_sched_entity *s_entity; if (sched->thread) kthread_stop(sched->thread); + /* Detach all sched_entites from this scheduler once it's stopped */ + for (i = DRM_SCHED_PRIORITY_COUNT - 1; i >= DRM_SCHED_PRIORITY_MIN; i--) { + struct drm_sched_rq *rq = &sched->sched_rq[i]; + + if (!rq) + continue; + + /* Loop this way because rq->lock is taken in drm_sched_rq_remove_entity */ + spin_lock(&rq->lock); + while ((s_entity = list_first_entry_or_null(&rq->entities, + struct drm_sched_entity, + list))) { + spin_unlock(&rq->lock); + + /* Prevent reinsertion and remove */ + spin_lock(&s_entity->rq_lock); + s_entity->stopped = true; + drm_sched_rq_remove_entity(rq, s_entity); + spin_unlock(&s_entity->rq_lock); + + spin_lock(&rq->lock); + } + spin_unlock(&rq->lock); + + } + + /* Wakeup everyone stuck in drm_sched_entity_flush for this scheduler */ + wake_up_all(&sched->job_scheduled); + /* Confirm no work left behind accessing device structures */ cancel_delayed_work_sync(&sched->work_tdr); -- 2.7.4 _______________________________________________ amd-gfx mailing list amd-gfx@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/amd-gfx