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=-9.7 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,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 07CDAC4360C for ; Thu, 26 Sep 2019 12:31:43 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id D7EFC207FF for ; Thu, 26 Sep 2019 12:31:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726463AbfIZMbm (ORCPT ); Thu, 26 Sep 2019 08:31:42 -0400 Received: from foss.arm.com ([217.140.110.172]:48346 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726054AbfIZMbm (ORCPT ); Thu, 26 Sep 2019 08:31:42 -0400 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 3CD48142F; Thu, 26 Sep 2019 05:31:41 -0700 (PDT) Received: from e112269-lin.arm.com (e112269-lin.cambridge.arm.com [10.1.196.133]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id D8B983F67D; Thu, 26 Sep 2019 05:31:39 -0700 (PDT) From: Steven Price To: Daniel Vetter , David Airlie , =?UTF-8?q?Christian=20K=C3=B6nig?= Cc: Steven Price , dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, Alex Deucher , Andrey Grodzovsky , Nayan Deshmukh , Sharat Masetty Subject: [PATCH v3] drm: Don't free jobs in wait_event_interruptible() Date: Thu, 26 Sep 2019 13:31:34 +0100 Message-Id: <20190926123134.4947-1-steven.price@arm.com> X-Mailer: git-send-email 2.20.1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org drm_sched_cleanup_jobs() attempts to free finished jobs, however because it is called as the condition of wait_event_interruptible() it must not sleep. Unfortuantly some free callbacks (notibly for Panfrost) do sleep. Instead let's rename drm_sched_cleanup_jobs() to drm_sched_get_cleanup_job() and simply return a job for processing if there is one. The caller can then call the free_job() callback outside the wait_event_interruptible() where sleeping is possible before re-checking and returning to sleep if necessary. Signed-off-by: Steven Price --- Changes from v2: * Actually move list_first_entry_or_null() within the lock drivers/gpu/drm/scheduler/sched_main.c | 42 ++++++++++++++------------ 1 file changed, 23 insertions(+), 19 deletions(-) diff --git a/drivers/gpu/drm/scheduler/sched_main.c b/drivers/gpu/drm/scheduler/sched_main.c index 9a0ee74d82dc..e4bd792f2b29 100644 --- a/drivers/gpu/drm/scheduler/sched_main.c +++ b/drivers/gpu/drm/scheduler/sched_main.c @@ -622,43 +622,41 @@ static void drm_sched_process_job(struct dma_fence *f, struct dma_fence_cb *cb) } /** - * drm_sched_cleanup_jobs - destroy finished jobs + * drm_sched_get_cleanup_job - fetch the next finished job to be destroyed * * @sched: scheduler instance * - * Remove all finished jobs from the mirror list and destroy them. + * Returns the next finished job from the mirror list (if there is one) + * ready for it to be destroyed. */ -static void drm_sched_cleanup_jobs(struct drm_gpu_scheduler *sched) +static struct drm_sched_job * +drm_sched_get_cleanup_job(struct drm_gpu_scheduler *sched) { + struct drm_sched_job *job = NULL; unsigned long flags; /* Don't destroy jobs while the timeout worker is running */ if (sched->timeout != MAX_SCHEDULE_TIMEOUT && !cancel_delayed_work(&sched->work_tdr)) - return; - + return NULL; - while (!list_empty(&sched->ring_mirror_list)) { - struct drm_sched_job *job; + spin_lock_irqsave(&sched->job_list_lock, flags); - job = list_first_entry(&sched->ring_mirror_list, + job = list_first_entry_or_null(&sched->ring_mirror_list, struct drm_sched_job, node); - if (!dma_fence_is_signaled(&job->s_fence->finished)) - break; - spin_lock_irqsave(&sched->job_list_lock, flags); + if (job && dma_fence_is_signaled(&job->s_fence->finished)) { /* remove job from ring_mirror_list */ list_del_init(&job->node); - spin_unlock_irqrestore(&sched->job_list_lock, flags); - - sched->ops->free_job(job); + } else { + job = NULL; + /* queue timeout for next job */ + drm_sched_start_timeout(sched); } - /* queue timeout for next job */ - spin_lock_irqsave(&sched->job_list_lock, flags); - drm_sched_start_timeout(sched); spin_unlock_irqrestore(&sched->job_list_lock, flags); + return job; } /** @@ -698,12 +696,18 @@ static int drm_sched_main(void *param) struct drm_sched_fence *s_fence; struct drm_sched_job *sched_job; struct dma_fence *fence; + struct drm_sched_job *cleanup_job = NULL; wait_event_interruptible(sched->wake_up_worker, - (drm_sched_cleanup_jobs(sched), + (cleanup_job = drm_sched_get_cleanup_job(sched)) || (!drm_sched_blocked(sched) && (entity = drm_sched_select_entity(sched))) || - kthread_should_stop())); + kthread_should_stop()); + + while (cleanup_job) { + sched->ops->free_job(cleanup_job); + cleanup_job = drm_sched_get_cleanup_job(sched); + } if (!entity) continue; -- 2.20.1