From patchwork Tue Aug 22 18:01:48 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Rob Clark X-Patchwork-Id: 13361312 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 6C0C3EE49B4 for ; Tue, 22 Aug 2023 18:02:41 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229659AbjHVSCl (ORCPT ); Tue, 22 Aug 2023 14:02:41 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52506 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229650AbjHVSCg (ORCPT ); Tue, 22 Aug 2023 14:02:36 -0400 Received: from mail-pf1-x436.google.com (mail-pf1-x436.google.com [IPv6:2607:f8b0:4864:20::436]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 418ABCD0; Tue, 22 Aug 2023 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q23-20020a637517000000b00563c1aa277asm8329462pgc.6.2023.08.22.11.02.30 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 22 Aug 2023 11:02:30 -0700 (PDT) From: Rob Clark To: dri-devel@lists.freedesktop.org Cc: linux-arm-msm@vger.kernel.org, freedreno@lists.freedesktop.org, Rob Clark , MyungJoo Ham , Kyungmin Park , Chanwoo Choi , linux-pm@vger.kernel.org (open list:DEVICE FREQUENCY (DEVFREQ)), linux-kernel@vger.kernel.org (open list) Subject: [PATCH v5 01/11] PM / devfreq: Drop unneed locking to appease lockdep Date: Tue, 22 Aug 2023 11:01:48 -0700 Message-ID: <20230822180208.95556-2-robdclark@gmail.com> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20230822180208.95556-1-robdclark@gmail.com> References: <20230822180208.95556-1-robdclark@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org From: Rob Clark In the process of adding lockdep annotation for GPU job_run() path to catch potential deadlocks against the shrinker/reclaim path, I turned up this lockdep splat: ====================================================== WARNING: possible circular locking dependency detected 6.2.0-rc8-debug+ #556 Not tainted ------------------------------------------------------ ring0/123 is trying to acquire lock: ffffff8087219078 (&devfreq->lock){+.+.}-{3:3}, at: devfreq_monitor_resume+0x3c/0xf0 but task is already holding lock: ffffffd6f64e57e8 (dma_fence_map){++++}-{0:0}, at: msm_job_run+0x68/0x150 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #3 (dma_fence_map){++++}-{0:0}: __dma_fence_might_wait+0x74/0xc0 dma_resv_lockdep+0x1f4/0x2f4 do_one_initcall+0x104/0x2bc kernel_init_freeable+0x344/0x34c kernel_init+0x30/0x134 ret_from_fork+0x10/0x20 -> #2 (mmu_notifier_invalidate_range_start){+.+.}-{0:0}: fs_reclaim_acquire+0x80/0xa8 slab_pre_alloc_hook.constprop.0+0x40/0x25c __kmem_cache_alloc_node+0x60/0x1cc __kmalloc+0xd8/0x100 topology_parse_cpu_capacity+0x8c/0x178 get_cpu_for_node+0x88/0xc4 parse_cluster+0x1b0/0x28c parse_cluster+0x8c/0x28c init_cpu_topology+0x168/0x188 smp_prepare_cpus+0x24/0xf8 kernel_init_freeable+0x18c/0x34c kernel_init+0x30/0x134 ret_from_fork+0x10/0x20 -> #1 (fs_reclaim){+.+.}-{0:0}: __fs_reclaim_acquire+0x3c/0x48 fs_reclaim_acquire+0x54/0xa8 slab_pre_alloc_hook.constprop.0+0x40/0x25c __kmem_cache_alloc_node+0x60/0x1cc __kmalloc_node_track_caller+0xb8/0xe0 kstrdup+0x70/0x90 kstrdup_const+0x38/0x48 kvasprintf_const+0x48/0xbc kobject_set_name_vargs+0x40/0xb0 dev_set_name+0x64/0x8c devfreq_add_device+0x31c/0x55c devm_devfreq_add_device+0x6c/0xb8 msm_devfreq_init+0xa8/0x16c msm_gpu_init+0x38c/0x570 adreno_gpu_init+0x1b4/0x2b4 a6xx_gpu_init+0x15c/0x3e4 adreno_bind+0x218/0x254 component_bind_all+0x114/0x1ec msm_drm_bind+0x2b8/0x608 try_to_bring_up_aggregate_device+0x88/0x1a4 __component_add+0xec/0x13c component_add+0x1c/0x28 dsi_dev_attach+0x28/0x34 dsi_host_attach+0xdc/0x124 mipi_dsi_attach+0x30/0x44 devm_mipi_dsi_attach+0x2c/0x70 ti_sn_bridge_probe+0x298/0x2c4 auxiliary_bus_probe+0x7c/0x94 really_probe+0x158/0x290 __driver_probe_device+0xc8/0xe0 driver_probe_device+0x44/0x100 __device_attach_driver+0x64/0xdc bus_for_each_drv+0xa0/0xc8 __device_attach+0xd8/0x168 device_initial_probe+0x1c/0x28 bus_probe_device+0x38/0xa0 deferred_probe_work_func+0xc8/0xe0 process_one_work+0x2d8/0x478 process_scheduled_works+0x4c/0x50 worker_thread+0x218/0x274 kthread+0xf0/0x100 ret_from_fork+0x10/0x20 -> #0 (&devfreq->lock){+.+.}-{3:3}: __lock_acquire+0xe00/0x1060 lock_acquire+0x1e0/0x2f8 __mutex_lock+0xcc/0x3c8 mutex_lock_nested+0x30/0x44 devfreq_monitor_resume+0x3c/0xf0 devfreq_simple_ondemand_handler+0x54/0x7c devfreq_resume_device+0xa4/0xe8 msm_devfreq_resume+0x78/0xa8 a6xx_pm_resume+0x110/0x234 adreno_runtime_resume+0x2c/0x38 pm_generic_runtime_resume+0x30/0x44 __rpm_callback+0x15c/0x174 rpm_callback+0x78/0x7c rpm_resume+0x318/0x524 __pm_runtime_resume+0x78/0xbc pm_runtime_get_sync.isra.0+0x14/0x20 msm_gpu_submit+0x58/0x178 msm_job_run+0x78/0x150 drm_sched_main+0x290/0x370 kthread+0xf0/0x100 ret_from_fork+0x10/0x20 other info that might help us debug this: Chain exists of: &devfreq->lock --> mmu_notifier_invalidate_range_start --> dma_fence_map Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(dma_fence_map); lock(mmu_notifier_invalidate_range_start); lock(dma_fence_map); lock(&devfreq->lock); *** DEADLOCK *** 2 locks held by ring0/123: #0: ffffff8087201170 (&gpu->lock){+.+.}-{3:3}, at: msm_job_run+0x64/0x150 #1: ffffffd6f64e57e8 (dma_fence_map){++++}-{0:0}, at: msm_job_run+0x68/0x150 stack backtrace: CPU: 6 PID: 123 Comm: ring0 Not tainted 6.2.0-rc8-debug+ #556 Hardware name: Google Lazor (rev1 - 2) with LTE (DT) Call trace: dump_backtrace.part.0+0xb4/0xf8 show_stack+0x20/0x38 dump_stack_lvl+0x9c/0xd0 dump_stack+0x18/0x34 print_circular_bug+0x1b4/0x1f0 check_noncircular+0x78/0xac __lock_acquire+0xe00/0x1060 lock_acquire+0x1e0/0x2f8 __mutex_lock+0xcc/0x3c8 mutex_lock_nested+0x30/0x44 devfreq_monitor_resume+0x3c/0xf0 devfreq_simple_ondemand_handler+0x54/0x7c devfreq_resume_device+0xa4/0xe8 msm_devfreq_resume+0x78/0xa8 a6xx_pm_resume+0x110/0x234 adreno_runtime_resume+0x2c/0x38 pm_generic_runtime_resume+0x30/0x44 __rpm_callback+0x15c/0x174 rpm_callback+0x78/0x7c rpm_resume+0x318/0x524 __pm_runtime_resume+0x78/0xbc pm_runtime_get_sync.isra.0+0x14/0x20 msm_gpu_submit+0x58/0x178 msm_job_run+0x78/0x150 drm_sched_main+0x290/0x370 kthread+0xf0/0x100 ret_from_fork+0x10/0x20 The issue is that we cannot be holding any lock while doing memory allocations that is also needed in the job_run (and in the case of devfreq, this means runpm_resume()) because lockdep sees this as a potential dependency. Fortunately there is really no reason to hold the devfreq lock when we are creating the devfreq device, as it is not yet visible to any other task. The only reason it was needed was for a lockdep assert in devfreq_get_freq_range(). Instead, split this up into an internal fxn that is used in the devfreq_add_device() (where the lock is not required). Signed-off-by: Rob Clark --- drivers/devfreq/devfreq.c | 46 ++++++++++++++++++--------------------- 1 file changed, 21 insertions(+), 25 deletions(-) diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c index e36cbb920ec8..e5558ec68ce8 100644 --- a/drivers/devfreq/devfreq.c +++ b/drivers/devfreq/devfreq.c @@ -111,23 +111,13 @@ static unsigned long find_available_max_freq(struct devfreq *devfreq) return max_freq; } -/** - * devfreq_get_freq_range() - Get the current freq range - * @devfreq: the devfreq instance - * @min_freq: the min frequency - * @max_freq: the max frequency - * - * This takes into consideration all constraints. - */ -void devfreq_get_freq_range(struct devfreq *devfreq, - unsigned long *min_freq, - unsigned long *max_freq) +static void __get_freq_range(struct devfreq *devfreq, + unsigned long *min_freq, + unsigned long *max_freq) { unsigned long *freq_table = devfreq->freq_table; s32 qos_min_freq, qos_max_freq; - lockdep_assert_held(&devfreq->lock); - /* * Initialize minimum/maximum frequency from freq table. * The devfreq drivers can initialize this in either ascending or @@ -158,6 +148,23 @@ void devfreq_get_freq_range(struct devfreq *devfreq, if (*min_freq > *max_freq) *min_freq = *max_freq; } + +/** + * devfreq_get_freq_range() - Get the current freq range + * @devfreq: the devfreq instance + * @min_freq: the min frequency + * @max_freq: the max frequency + * + * This takes into consideration all constraints. + */ +void devfreq_get_freq_range(struct devfreq *devfreq, + unsigned long *min_freq, + unsigned long *max_freq) +{ + lockdep_assert_held(&devfreq->lock); + + __get_freq_range(devfreq, min_freq, max_freq); +} EXPORT_SYMBOL(devfreq_get_freq_range); /** @@ -810,7 +817,6 @@ struct devfreq *devfreq_add_device(struct device *dev, } mutex_init(&devfreq->lock); - mutex_lock(&devfreq->lock); devfreq->dev.parent = dev; devfreq->dev.class = devfreq_class; devfreq->dev.release = devfreq_dev_release; @@ -823,17 +829,14 @@ struct devfreq *devfreq_add_device(struct device *dev, if (devfreq->profile->timer < 0 || devfreq->profile->timer >= DEVFREQ_TIMER_NUM) { - mutex_unlock(&devfreq->lock); err = -EINVAL; goto err_dev; } if (!devfreq->profile->max_state || !devfreq->profile->freq_table) { - mutex_unlock(&devfreq->lock); err = set_freq_table(devfreq); if (err < 0) goto err_dev; - mutex_lock(&devfreq->lock); } else { devfreq->freq_table = devfreq->profile->freq_table; devfreq->max_state = devfreq->profile->max_state; @@ -841,19 +844,17 @@ struct devfreq *devfreq_add_device(struct device *dev, devfreq->scaling_min_freq = find_available_min_freq(devfreq); if (!devfreq->scaling_min_freq) { - mutex_unlock(&devfreq->lock); err = -EINVAL; goto err_dev; } devfreq->scaling_max_freq = find_available_max_freq(devfreq); if (!devfreq->scaling_max_freq) { - mutex_unlock(&devfreq->lock); err = -EINVAL; goto err_dev; } - devfreq_get_freq_range(devfreq, &min_freq, &max_freq); + __get_freq_range(devfreq, &min_freq, &max_freq); devfreq->suspend_freq = dev_pm_opp_get_suspend_opp_freq(dev); devfreq->opp_table = dev_pm_opp_get_opp_table(dev); @@ -865,7 +866,6 @@ struct devfreq *devfreq_add_device(struct device *dev, dev_set_name(&devfreq->dev, "%s", dev_name(dev)); err = device_register(&devfreq->dev); if (err) { - mutex_unlock(&devfreq->lock); put_device(&devfreq->dev); goto err_out; } @@ -876,7 +876,6 @@ struct devfreq *devfreq_add_device(struct device *dev, devfreq->max_state), GFP_KERNEL); if (!devfreq->stats.trans_table) { - mutex_unlock(&devfreq->lock); err = -ENOMEM; goto err_devfreq; } @@ -886,7 +885,6 @@ struct devfreq *devfreq_add_device(struct device *dev, sizeof(*devfreq->stats.time_in_state), GFP_KERNEL); if (!devfreq->stats.time_in_state) { - mutex_unlock(&devfreq->lock); err = -ENOMEM; goto err_devfreq; } @@ -896,8 +894,6 @@ struct devfreq *devfreq_add_device(struct device *dev, srcu_init_notifier_head(&devfreq->transition_notifier_list); - mutex_unlock(&devfreq->lock); - err = dev_pm_qos_add_request(dev, &devfreq->user_min_freq_req, DEV_PM_QOS_MIN_FREQUENCY, 0); if (err < 0) From patchwork Tue Aug 22 18:01:49 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Rob Clark X-Patchwork-Id: 13361311 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 37965EE49B2 for ; 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Tue, 22 Aug 2023 11:02:33 -0700 (PDT) Received: from localhost ([2a00:79e1:abd:4a00:6c80:7c10:75a0:44f4]) by smtp.gmail.com with ESMTPSA id t7-20020a170902e84700b001b898595be7sm9347196plg.291.2023.08.22.11.02.32 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 22 Aug 2023 11:02:32 -0700 (PDT) From: Rob Clark To: dri-devel@lists.freedesktop.org Cc: linux-arm-msm@vger.kernel.org, freedreno@lists.freedesktop.org, Rob Clark , MyungJoo Ham , Kyungmin Park , Chanwoo Choi , linux-pm@vger.kernel.org (open list:DEVICE FREQUENCY (DEVFREQ)), linux-kernel@vger.kernel.org (open list) Subject: [PATCH v5 02/11] PM / devfreq: Teach lockdep about locking order Date: Tue, 22 Aug 2023 11:01:49 -0700 Message-ID: <20230822180208.95556-3-robdclark@gmail.com> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20230822180208.95556-1-robdclark@gmail.com> References: <20230822180208.95556-1-robdclark@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org From: Rob Clark This will make it easier to catch places doing allocations that can trigger reclaim under devfreq->lock. Because devfreq->lock is held over various devfreq_dev_profile callbacks, there might be some fallout if those callbacks do allocations that can trigger reclaim, but I've looked through the various callback implementations and don't see anything obvious. If it does trigger any lockdep splats, those should be fixed. Signed-off-by: Rob Clark --- drivers/devfreq/devfreq.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c index e5558ec68ce8..81add6064406 100644 --- a/drivers/devfreq/devfreq.c +++ b/drivers/devfreq/devfreq.c @@ -817,6 +817,12 @@ struct devfreq *devfreq_add_device(struct device *dev, } mutex_init(&devfreq->lock); + + /* Teach lockdep about lock ordering wrt. shrinker: */ + fs_reclaim_acquire(GFP_KERNEL); + might_lock(&devfreq->lock); + fs_reclaim_release(GFP_KERNEL); + devfreq->dev.parent = dev; devfreq->dev.class = devfreq_class; devfreq->dev.release = devfreq_dev_release; From patchwork Tue Aug 22 18:01:50 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Rob Clark X-Patchwork-Id: 13361313 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 0E713EE49B7 for ; Tue, 22 Aug 2023 18:02:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229674AbjHVSCm (ORCPT ); Tue, 22 Aug 2023 14:02:42 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52554 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229693AbjHVSCi (ORCPT ); Tue, 22 Aug 2023 14:02:38 -0400 Received: from mail-pj1-x102b.google.com (mail-pj1-x102b.google.com [IPv6:2607:f8b0:4864:20::102b]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6777F185; Tue, 22 Aug 2023 11:02:36 -0700 (PDT) Received: by mail-pj1-x102b.google.com with SMTP id 98e67ed59e1d1-26d63b608d4so1902404a91.2; Tue, 22 Aug 2023 11:02:36 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20221208; t=1692727356; x=1693332156; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=jwi88nXkWgcM9/OEm1nLYgH6sllE6KibtJsTy1TkfRY=; b=EG7ioNIUIceTPWyCUvSdDcnxfTj11NqrOW3xhYTfkYwJeISXyeQAe8qhaUeVGhVC33 YInKNYGuzwqKylb23Id2fHc1EPI5GkHMBGZVNiiRrOaFM2inyQVotYc88yB0+ap5oteZ ptoJaasGdzceRe9xgY0as2WIHBcbq5sHJ28cxQPpSUM9Nx94Lt86TyIO0a/iqQqKbsvV 0S1hll/g6wPR4QafMBuY3Zkluaf/CmLiCjfHMPMkiN5EgvL99GYELAUPgznmSs/62Vz7 MEXK1KDX83QEqQSsL5W/re7Dlon2s6xwTWtGdXR92ZOLcX2szBCkNrLxrjwcTiQca89R 4k1A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1692727356; x=1693332156; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=jwi88nXkWgcM9/OEm1nLYgH6sllE6KibtJsTy1TkfRY=; b=hzpDgQ+uzenzt5jZGYJMzrFcJP02EHS3D6xxQj5qNIaHaM/nevkX7Wd3/PAdmxLm2d sZ7f7ACUQRuDQgRsO6fu+H1SDB7RRxZ6kT6wYAqLGqU6tOgy+u73A2I4w+ny7wS43ygA ESjLm9dsPuIeIhYfAiEuv103uJU6A7ksBEyIZC/5+bwOwTeIbrljFYt57GsVQFq1zBMS IE8Z42AQbL7eS1y6WsWumt++igY87eWbPtpDZlQNxeiJokN4Wvokq6oPx5GUXSMQVQAG fIc/BnKuH7aL1eLxJbLY4Rsj7KdxxUc/vzTGa2fLKX2erTAsbGQKUe8PPuPVtMZcmJz7 HdJQ== X-Gm-Message-State: AOJu0Yy6hpH3e2pEhBYy8BVjNf4zKdQ0Lvk+K5wZozzdWrlGv7s0DTK6 AYRZJRnyhmtzpkAuXYAU+PM= X-Google-Smtp-Source: AGHT+IHW2p3YcWjF+o1eUimt4hk+4aWpf0Seb42+6ZeecRRQBEykeMw+z/Rs5eTQFK9r2A62SzogVw== X-Received: by 2002:a17:90b:4c81:b0:26b:219f:3399 with SMTP id my1-20020a17090b4c8100b0026b219f3399mr6286786pjb.35.1692727355656; Tue, 22 Aug 2023 11:02:35 -0700 (PDT) Received: from localhost ([2a00:79e1:abd:4a00:6c80:7c10:75a0:44f4]) by smtp.gmail.com with ESMTPSA id n10-20020a17090a670a00b0025c1cfdb93esm8183747pjj.13.2023.08.22.11.02.34 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 22 Aug 2023 11:02:35 -0700 (PDT) From: Rob Clark To: dri-devel@lists.freedesktop.org Cc: linux-arm-msm@vger.kernel.org, freedreno@lists.freedesktop.org, Rob Clark , "Rafael J . Wysocki" , Pavel Machek , Len Brown , Greg Kroah-Hartman , linux-pm@vger.kernel.org (open list:HIBERNATION (aka Software Suspend, aka swsusp)), linux-kernel@vger.kernel.org (open list) Subject: [PATCH v5 03/11] PM / QoS: Fix constraints alloc vs reclaim locking Date: Tue, 22 Aug 2023 11:01:50 -0700 Message-ID: <20230822180208.95556-4-robdclark@gmail.com> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20230822180208.95556-1-robdclark@gmail.com> References: <20230822180208.95556-1-robdclark@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org From: Rob Clark In the process of adding lockdep annotation for drm GPU scheduler's job_run() to detect potential deadlock against shrinker/reclaim, I hit this lockdep splat: ====================================================== WARNING: possible circular locking dependency detected 6.2.0-rc8-debug+ #558 Tainted: G W ------------------------------------------------------ ring0/125 is trying to acquire lock: ffffffd6d6ce0f28 (dev_pm_qos_mtx){+.+.}-{3:3}, at: dev_pm_qos_update_request+0x38/0x68 but task is already holding lock: ffffff8087239208 (&gpu->active_lock){+.+.}-{3:3}, at: msm_gpu_submit+0xec/0x178 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #4 (&gpu->active_lock){+.+.}-{3:3}: __mutex_lock+0xcc/0x3c8 mutex_lock_nested+0x30/0x44 msm_gpu_submit+0xec/0x178 msm_job_run+0x78/0x150 drm_sched_main+0x290/0x370 kthread+0xf0/0x100 ret_from_fork+0x10/0x20 -> #3 (dma_fence_map){++++}-{0:0}: __dma_fence_might_wait+0x74/0xc0 dma_resv_lockdep+0x1f4/0x2f4 do_one_initcall+0x104/0x2bc kernel_init_freeable+0x344/0x34c kernel_init+0x30/0x134 ret_from_fork+0x10/0x20 -> #2 (mmu_notifier_invalidate_range_start){+.+.}-{0:0}: fs_reclaim_acquire+0x80/0xa8 slab_pre_alloc_hook.constprop.0+0x40/0x25c __kmem_cache_alloc_node+0x60/0x1cc __kmalloc+0xd8/0x100 topology_parse_cpu_capacity+0x8c/0x178 get_cpu_for_node+0x88/0xc4 parse_cluster+0x1b0/0x28c parse_cluster+0x8c/0x28c init_cpu_topology+0x168/0x188 smp_prepare_cpus+0x24/0xf8 kernel_init_freeable+0x18c/0x34c kernel_init+0x30/0x134 ret_from_fork+0x10/0x20 -> #1 (fs_reclaim){+.+.}-{0:0}: __fs_reclaim_acquire+0x3c/0x48 fs_reclaim_acquire+0x54/0xa8 slab_pre_alloc_hook.constprop.0+0x40/0x25c __kmem_cache_alloc_node+0x60/0x1cc kmalloc_trace+0x50/0xa8 dev_pm_qos_constraints_allocate+0x38/0x100 __dev_pm_qos_add_request+0xb0/0x1e8 dev_pm_qos_add_request+0x58/0x80 dev_pm_qos_expose_latency_limit+0x60/0x13c register_cpu+0x12c/0x130 topology_init+0xac/0xbc do_one_initcall+0x104/0x2bc kernel_init_freeable+0x344/0x34c kernel_init+0x30/0x134 ret_from_fork+0x10/0x20 -> #0 (dev_pm_qos_mtx){+.+.}-{3:3}: __lock_acquire+0xe00/0x1060 lock_acquire+0x1e0/0x2f8 __mutex_lock+0xcc/0x3c8 mutex_lock_nested+0x30/0x44 dev_pm_qos_update_request+0x38/0x68 msm_devfreq_boost+0x40/0x70 msm_devfreq_active+0xc0/0xf0 msm_gpu_submit+0x10c/0x178 msm_job_run+0x78/0x150 drm_sched_main+0x290/0x370 kthread+0xf0/0x100 ret_from_fork+0x10/0x20 other info that might help us debug this: Chain exists of: dev_pm_qos_mtx --> dma_fence_map --> &gpu->active_lock Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&gpu->active_lock); lock(dma_fence_map); lock(&gpu->active_lock); lock(dev_pm_qos_mtx); *** DEADLOCK *** 3 locks held by ring0/123: #0: ffffff8087251170 (&gpu->lock){+.+.}-{3:3}, at: msm_job_run+0x64/0x150 #1: ffffffd00b0e57e8 (dma_fence_map){++++}-{0:0}, at: msm_job_run+0x68/0x150 #2: ffffff8087251208 (&gpu->active_lock){+.+.}-{3:3}, at: msm_gpu_submit+0xec/0x178 stack backtrace: CPU: 6 PID: 123 Comm: ring0 Not tainted 6.2.0-rc8-debug+ #559 Hardware name: Google Lazor (rev1 - 2) with LTE (DT) Call trace: dump_backtrace.part.0+0xb4/0xf8 show_stack+0x20/0x38 dump_stack_lvl+0x9c/0xd0 dump_stack+0x18/0x34 print_circular_bug+0x1b4/0x1f0 check_noncircular+0x78/0xac __lock_acquire+0xe00/0x1060 lock_acquire+0x1e0/0x2f8 __mutex_lock+0xcc/0x3c8 mutex_lock_nested+0x30/0x44 dev_pm_qos_update_request+0x38/0x68 msm_devfreq_boost+0x40/0x70 msm_devfreq_active+0xc0/0xf0 msm_gpu_submit+0x10c/0x178 msm_job_run+0x78/0x150 drm_sched_main+0x290/0x370 kthread+0xf0/0x100 ret_from_fork+0x10/0x20 The issue is that dev_pm_qos_mtx is held in the runpm suspend/resume (or freq change) path, but it is also held across allocations that could recurse into shrinker. Solve this by changing dev_pm_qos_constraints_allocate() into a function that can be called unconditionally before the device qos object is needed and before aquiring dev_pm_qos_mtx. This way the allocations can be done without holding the mutex. In the case that we raced with another thread to allocate the qos object, detect this *after* acquiring the dev_pm_qos_mtx and simply free the redundant allocations. Suggested-by: Rafael J. Wysocki Signed-off-by: Rob Clark Acked-by: Rafael J. Wysocki --- drivers/base/power/qos.c | 76 +++++++++++++++++++++++++++++----------- 1 file changed, 56 insertions(+), 20 deletions(-) diff --git a/drivers/base/power/qos.c b/drivers/base/power/qos.c index 8e93167f1783..7e95760d16dc 100644 --- a/drivers/base/power/qos.c +++ b/drivers/base/power/qos.c @@ -185,27 +185,33 @@ static int apply_constraint(struct dev_pm_qos_request *req, } /* - * dev_pm_qos_constraints_allocate + * dev_pm_qos_constraints_allocate: Allocate and initializes qos constraints * @dev: device to allocate data for * - * Called at the first call to add_request, for constraint data allocation - * Must be called with the dev_pm_qos_mtx mutex held + * Called to allocate constraints before dev_pm_qos_mtx mutex is held. Should + * be matched with a call to dev_pm_qos_constraints_set() once dev_pm_qos_mtx + * is held. */ -static int dev_pm_qos_constraints_allocate(struct device *dev) +static struct dev_pm_qos *dev_pm_qos_constraints_allocate(struct device *dev) { struct dev_pm_qos *qos; struct pm_qos_constraints *c; struct blocking_notifier_head *n; - qos = kzalloc(sizeof(*qos), GFP_KERNEL); + /* + * If constraints are already allocated, we can skip speculatively + * allocating a new one, as we don't have to work about qos transitioning + * from non-null to null. The constraints are only freed on device + * removal. + */ + if (dev->power.qos) + return NULL; + + qos = kzalloc(sizeof(*qos) + 3 * sizeof(*n), GFP_KERNEL); if (!qos) - return -ENOMEM; + return NULL; - n = kzalloc(3 * sizeof(*n), GFP_KERNEL); - if (!n) { - kfree(qos); - return -ENOMEM; - } + n = (struct blocking_notifier_head *)(qos + 1); c = &qos->resume_latency; plist_head_init(&c->list); @@ -227,11 +233,29 @@ static int dev_pm_qos_constraints_allocate(struct device *dev) INIT_LIST_HEAD(&qos->flags.list); + return qos; +} + +/* + * dev_pm_qos_constraints_set: Ensure dev->power.qos is set + * + * If dev->power.qos is already set, free the newly allocated qos constraints. + * Otherwise set dev->power.qos. Must be called with dev_pm_qos_mtx held. + * + * This split unsynchronized allocation and synchronized set moves allocation + * out from under dev_pm_qos_mtx, so that lockdep does does not get angry about + * drivers which use dev_pm_qos in paths related to shrinker/reclaim. + */ +static void dev_pm_qos_constraints_set(struct device *dev, struct dev_pm_qos *qos) +{ + if (dev->power.qos) { + kfree(qos); + return; + } + spin_lock_irq(&dev->power.lock); dev->power.qos = qos; spin_unlock_irq(&dev->power.lock); - - return 0; } static void __dev_pm_qos_hide_latency_limit(struct device *dev); @@ -309,7 +333,6 @@ void dev_pm_qos_constraints_destroy(struct device *dev) dev->power.qos = ERR_PTR(-ENODEV); spin_unlock_irq(&dev->power.lock); - kfree(qos->resume_latency.notifiers); kfree(qos); out: @@ -341,7 +364,7 @@ static int __dev_pm_qos_add_request(struct device *dev, if (IS_ERR(dev->power.qos)) ret = -ENODEV; else if (!dev->power.qos) - ret = dev_pm_qos_constraints_allocate(dev); + ret = -ENOMEM; trace_dev_pm_qos_add_request(dev_name(dev), type, value); if (ret) @@ -388,9 +411,11 @@ static int __dev_pm_qos_add_request(struct device *dev, int dev_pm_qos_add_request(struct device *dev, struct dev_pm_qos_request *req, enum dev_pm_qos_req_type type, s32 value) { + struct dev_pm_qos *qos = dev_pm_qos_constraints_allocate(dev); int ret; mutex_lock(&dev_pm_qos_mtx); + dev_pm_qos_constraints_set(dev, qos); ret = __dev_pm_qos_add_request(dev, req, type, value); mutex_unlock(&dev_pm_qos_mtx); return ret; @@ -535,14 +560,15 @@ EXPORT_SYMBOL_GPL(dev_pm_qos_remove_request); int dev_pm_qos_add_notifier(struct device *dev, struct notifier_block *notifier, enum dev_pm_qos_req_type type) { + struct dev_pm_qos *qos = dev_pm_qos_constraints_allocate(dev); int ret = 0; mutex_lock(&dev_pm_qos_mtx); + dev_pm_qos_constraints_set(dev, qos); + if (IS_ERR(dev->power.qos)) ret = -ENODEV; - else if (!dev->power.qos) - ret = dev_pm_qos_constraints_allocate(dev); if (ret) goto unlock; @@ -903,12 +929,22 @@ s32 dev_pm_qos_get_user_latency_tolerance(struct device *dev) */ int dev_pm_qos_update_user_latency_tolerance(struct device *dev, s32 val) { - int ret; + struct dev_pm_qos *qos = dev_pm_qos_constraints_allocate(dev); + int ret = 0; mutex_lock(&dev_pm_qos_mtx); - if (IS_ERR_OR_NULL(dev->power.qos) - || !dev->power.qos->latency_tolerance_req) { + dev_pm_qos_constraints_set(dev, qos); + + if (IS_ERR(dev->power.qos)) + ret = -ENODEV; + else if (!dev->power.qos) + ret = -ENOMEM; + + if (ret) + goto out; + + if (!dev->power.qos->latency_tolerance_req) { struct dev_pm_qos_request *req; if (val < 0) { From patchwork Tue Aug 22 18:01:51 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Rob Clark X-Patchwork-Id: 13361314 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 931E6EE49B9 for ; Tue, 22 Aug 2023 18:02:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229677AbjHVSCm (ORCPT ); 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Tue, 22 Aug 2023 11:02:37 -0700 (PDT) From: Rob Clark To: dri-devel@lists.freedesktop.org Cc: linux-arm-msm@vger.kernel.org, freedreno@lists.freedesktop.org, Rob Clark , "Rafael J. Wysocki" , Pavel Machek , Len Brown , Greg Kroah-Hartman , linux-pm@vger.kernel.org (open list:HIBERNATION (aka Software Suspend, aka swsusp)), linux-kernel@vger.kernel.org (open list) Subject: [PATCH v5 04/11] PM / QoS: Decouple request alloc from dev_pm_qos_mtx Date: Tue, 22 Aug 2023 11:01:51 -0700 Message-ID: <20230822180208.95556-5-robdclark@gmail.com> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20230822180208.95556-1-robdclark@gmail.com> References: <20230822180208.95556-1-robdclark@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org From: Rob Clark Similar to the previous patch, move the allocation out from under dev_pm_qos_mtx, by speculatively doing the allocation and handle any race after acquiring dev_pm_qos_mtx by freeing the redundant allocation. Signed-off-by: Rob Clark --- drivers/base/power/qos.c | 13 +++++++------ 1 file changed, 7 insertions(+), 6 deletions(-) diff --git a/drivers/base/power/qos.c b/drivers/base/power/qos.c index 7e95760d16dc..09834f3354d7 100644 --- a/drivers/base/power/qos.c +++ b/drivers/base/power/qos.c @@ -930,8 +930,12 @@ s32 dev_pm_qos_get_user_latency_tolerance(struct device *dev) int dev_pm_qos_update_user_latency_tolerance(struct device *dev, s32 val) { struct dev_pm_qos *qos = dev_pm_qos_constraints_allocate(dev); + struct dev_pm_qos_request *req = NULL; int ret = 0; + if (!qos->latency_tolerance_req) + req = kzalloc(sizeof(*req), GFP_KERNEL); + mutex_lock(&dev_pm_qos_mtx); dev_pm_qos_constraints_set(dev, qos); @@ -945,8 +949,6 @@ int dev_pm_qos_update_user_latency_tolerance(struct device *dev, s32 val) goto out; if (!dev->power.qos->latency_tolerance_req) { - struct dev_pm_qos_request *req; - if (val < 0) { if (val == PM_QOS_LATENCY_TOLERANCE_NO_CONSTRAINT) ret = 0; @@ -954,17 +956,15 @@ int dev_pm_qos_update_user_latency_tolerance(struct device *dev, s32 val) ret = -EINVAL; goto out; } - req = kzalloc(sizeof(*req), GFP_KERNEL); if (!req) { ret = -ENOMEM; goto out; } ret = __dev_pm_qos_add_request(dev, req, DEV_PM_QOS_LATENCY_TOLERANCE, val); - if (ret < 0) { - kfree(req); + if (ret < 0) goto out; - } dev->power.qos->latency_tolerance_req = req; + req = NULL; } else { if (val < 0) { __dev_pm_qos_drop_user_request(dev, DEV_PM_QOS_LATENCY_TOLERANCE); @@ -976,6 +976,7 @@ int dev_pm_qos_update_user_latency_tolerance(struct device *dev, s32 val) out: mutex_unlock(&dev_pm_qos_mtx); + kfree(req); return ret; } EXPORT_SYMBOL_GPL(dev_pm_qos_update_user_latency_tolerance); From patchwork Tue Aug 22 18:01:52 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Rob Clark X-Patchwork-Id: 13361315 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 089A1EE49B1 for ; Tue, 22 Aug 2023 18:02:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229735AbjHVSCs (ORCPT ); Tue, 22 Aug 2023 14:02:48 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36380 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229682AbjHVSCm (ORCPT ); Tue, 22 Aug 2023 14:02:42 -0400 Received: from mail-pl1-x630.google.com (mail-pl1-x630.google.com [IPv6:2607:f8b0:4864:20::630]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 208C7CC; Tue, 22 Aug 2023 11:02:41 -0700 (PDT) Received: by mail-pl1-x630.google.com with SMTP id d9443c01a7336-1bf078d5fb7so31628845ad.0; Tue, 22 Aug 2023 11:02:41 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20221208; t=1692727360; x=1693332160; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=pQPrHId/lCHDPLFw57GJfdnbAiLt5erdzCNTXGSDhdo=; b=Ie2ANdwPuvvaJZxkLtrV0mygSDZzPCCbtaixTP8JhVB/Dc8l9V7ZwtmGdhFz5nHUp8 0pwhfQZmLpaJW8iDA2VwHvcAgkKpV0TMqB9fKSlHP7RDEocY2yvNGjhM95DxrPb8fidf FlIJaGh+hNfhxNGHXNRMtQy2Bwu71FYUO/2lsS+d0iD75UwGCdHdk+430CWP03moOP/g vh1w62NFiGunZUR5wq3X8AXFQHYj7/ZNM0nvpnAGGzLB7biAnJZAKd/hS/75nPJidBRd wyB7HRXthbT3p8bRWgKtAX5Wh9DXBfund8EKANorutH3NVpoOehVuli/wxpVea/0kRs9 FAUA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1692727360; x=1693332160; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=pQPrHId/lCHDPLFw57GJfdnbAiLt5erdzCNTXGSDhdo=; b=NV7eOdpwyf22aGloh5Tr5HzLMuSfyhavubVTydg6XeL7aHzsiplqRTRJFZ7DTlu433 9li4AMWSfqo+oBPVRlzm/JLB+OvMkx5eKRuz0Xy+M2sJQ4AvVkWQNu+uNBX0z/p1af/d k3NpP2hbLRcczPZ4JpMYJMOE27jbPExYYbe1IZQXHEOqfgerfK/NP+EBOxuOrNTHWBBx ijSVwbO33Sa/XnSUDJEuz1BAAECgSS2b1xc2RbkvF76ij1NIcG4MKi2Rk23rdQMGi3vN I0xOOoi10XCiaeff3HlCLaKgzdxqgwqSwgdduUltMoab7kZAp+R977DLqLlQfd2/hsrK vwsg== X-Gm-Message-State: AOJu0YzscdrVEfr/oNOXZ4rmcPIag44pQsjdHcH351knpanIQsKhZ8KQ Jb4g2RTziYHLGK6jTinb03I= X-Google-Smtp-Source: AGHT+IGraTUb9fjtbBbpbEedDJNHXKDUjifcWUB+DLrPWbQJCnkqOHt2z8O4M1Y+WpOEnMa46nzFqw== X-Received: by 2002:a17:902:c086:b0:1bc:5924:2da2 with SMTP id j6-20020a170902c08600b001bc59242da2mr8036097pld.56.1692727360397; Tue, 22 Aug 2023 11:02:40 -0700 (PDT) Received: from localhost ([2a00:79e1:abd:4a00:6c80:7c10:75a0:44f4]) by smtp.gmail.com with ESMTPSA id f5-20020a170902684500b001bf6ea340b3sm5744775pln.116.2023.08.22.11.02.39 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 22 Aug 2023 11:02:39 -0700 (PDT) From: Rob Clark To: dri-devel@lists.freedesktop.org Cc: linux-arm-msm@vger.kernel.org, freedreno@lists.freedesktop.org, Rob Clark , "Rafael J. Wysocki" , Pavel Machek , Len Brown , Greg Kroah-Hartman , linux-pm@vger.kernel.org (open list:HIBERNATION (aka Software Suspend, aka swsusp)), linux-kernel@vger.kernel.org (open list) Subject: [PATCH v5 05/11] PM / QoS: Teach lockdep about dev_pm_qos_mtx locking order Date: Tue, 22 Aug 2023 11:01:52 -0700 Message-ID: <20230822180208.95556-6-robdclark@gmail.com> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20230822180208.95556-1-robdclark@gmail.com> References: <20230822180208.95556-1-robdclark@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org From: Rob Clark Annotate dev_pm_qos_mtx to teach lockdep to scream about allocations that could trigger reclaim under dev_pm_qos_mtx. Signed-off-by: Rob Clark --- drivers/base/power/qos.c | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/drivers/base/power/qos.c b/drivers/base/power/qos.c index 09834f3354d7..2018c805a6f1 100644 --- a/drivers/base/power/qos.c +++ b/drivers/base/power/qos.c @@ -1017,3 +1017,14 @@ void dev_pm_qos_hide_latency_tolerance(struct device *dev) pm_runtime_put(dev); } EXPORT_SYMBOL_GPL(dev_pm_qos_hide_latency_tolerance); + +static int __init dev_pm_qos_init(void) +{ + /* Teach lockdep about lock ordering wrt. shrinker: */ + fs_reclaim_acquire(GFP_KERNEL); + might_lock(&dev_pm_qos_mtx); + fs_reclaim_release(GFP_KERNEL); + + return 0; +} +early_initcall(dev_pm_qos_init); From patchwork Tue Aug 22 18:01:53 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Rob Clark X-Patchwork-Id: 13361316 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 85F84EE49BB for ; Tue, 22 Aug 2023 18:02:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229718AbjHVSCt (ORCPT ); Tue, 22 Aug 2023 14:02:49 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36488 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229725AbjHVSCs (ORCPT ); Tue, 22 Aug 2023 14:02:48 -0400 Received: from mail-pf1-x42c.google.com (mail-pf1-x42c.google.com [IPv6:2607:f8b0:4864:20::42c]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 96A83CF7; Tue, 22 Aug 2023 11:02:43 -0700 (PDT) Received: by mail-pf1-x42c.google.com with SMTP id d2e1a72fcca58-68a410316a2so1799739b3a.0; Tue, 22 Aug 2023 11:02:43 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20221208; t=1692727363; x=1693332163; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=u9SzfK8f8benMkFPZZn5M0dDI6Vik7V2Z9qVmakjIP4=; b=BUmYPxVYi3TCguux1OvLKF3zItJglVH6WokZwQ3RPuFqtI6yaAGy1nVo8t/0/XK+o5 JjII6ZAsgQUjEnzU54Vnq5NLqSUhV1FfJ6DiJmDRQhpS++IxLGQvDe9TOEzkU1yBspeg I54bTJPBIbB31YDv6TVkDO2weoaJZTEGplAYaKdGe9rforLFMJ1oMDnKdXGOBZqkKA0h ogdrhzC3yjprJ+ByxMnbquKSSAtlM2GuJTOewQoFvlkYViu3/9jr0M3lWUGVxmDzPf0+ QdLHUIBM3F8NcxpJgCc/KNVW1+T/N/cQpEA0xYIfMpVHtNKWdqM+dXJmG70OmChPXXc9 B7dQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1692727363; x=1693332163; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=u9SzfK8f8benMkFPZZn5M0dDI6Vik7V2Z9qVmakjIP4=; b=Np+mb+9uxG+jrvK3d64A/0+TgmS3p37d6DmIvol8KHmA51Q0N8rDGJM3a73vDAvgxY DQbnaYSmg0H5+6bUbYHvPf/Biq1WLVFixutHBRG4ANPTP60Af83QdLfkvZhlJxCGpp6C qZ6PGuLEuBcRgm7MomkxrqjytWOnMIPsTCcGyvp+qqyrIs/JB6cUGODdJCXVfp+jd1om 3lr7hDRTwYospvTTIeoRQwyRlVqy92prX/nUnHV+5OmfwoRkkrWPeuHhlFN0YqNrKIAq RRB7FMvrzte5sd1krGZawWBXCffQ6X0QMUGIwFZ7elQ2YFXdKtUCGBSupppwfNiG5Xn/ ADwQ== X-Gm-Message-State: AOJu0Yy/MIIypWMhRLsUbKe8AUew4qOKwbhgFFBSwedySRAaFXrNOg10 WPZSJfKd+VZRZZgE37oPCI7+FIHyihM= X-Google-Smtp-Source: AGHT+IGRcyBBv65VkHIxvNAW7Yx1lfU/MT1pjv4TCqmWudM9Pbj6wlEGi3+/jRSVvLHDIXI/jo27gQ== X-Received: by 2002:a05:6a20:ddaa:b0:137:514a:984f with SMTP id kw42-20020a056a20ddaa00b00137514a984fmr7282963pzb.35.1692727362966; Tue, 22 Aug 2023 11:02:42 -0700 (PDT) Received: from localhost ([2a00:79e1:abd:4a00:6c80:7c10:75a0:44f4]) by smtp.gmail.com with ESMTPSA id l9-20020a635b49000000b00565dd935938sm8189832pgm.85.2023.08.22.11.02.41 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 22 Aug 2023 11:02:42 -0700 (PDT) From: Rob Clark To: dri-devel@lists.freedesktop.org Cc: linux-arm-msm@vger.kernel.org, freedreno@lists.freedesktop.org, Rob Clark , Georgi Djakov , linux-pm@vger.kernel.org (open list:INTERCONNECT API), linux-kernel@vger.kernel.org (open list) Subject: [PATCH v5 06/11] interconnect: Fix locking for runpm vs reclaim Date: Tue, 22 Aug 2023 11:01:53 -0700 Message-ID: <20230822180208.95556-7-robdclark@gmail.com> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20230822180208.95556-1-robdclark@gmail.com> References: <20230822180208.95556-1-robdclark@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org From: Rob Clark For cases where icc_bw_set() can be called in callbaths that could deadlock against shrinker/reclaim, such as runpm resume, we need to decouple the icc locking. Introduce a new icc_bw_lock for cases where we need to serialize bw aggregation and update to decouple that from paths that require memory allocation such as node/link creation/ destruction. Fixes this lockdep splat: ====================================================== WARNING: possible circular locking dependency detected 6.2.0-rc8-debug+ #554 Not tainted ------------------------------------------------------ ring0/132 is trying to acquire lock: ffffff80871916d0 (&gmu->lock){+.+.}-{3:3}, at: a6xx_pm_resume+0xf0/0x234 but task is already holding lock: ffffffdb5aee57e8 (dma_fence_map){++++}-{0:0}, at: msm_job_run+0x68/0x150 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #4 (dma_fence_map){++++}-{0:0}: __dma_fence_might_wait+0x74/0xc0 dma_resv_lockdep+0x1f4/0x2f4 do_one_initcall+0x104/0x2bc kernel_init_freeable+0x344/0x34c kernel_init+0x30/0x134 ret_from_fork+0x10/0x20 -> #3 (mmu_notifier_invalidate_range_start){+.+.}-{0:0}: fs_reclaim_acquire+0x80/0xa8 slab_pre_alloc_hook.constprop.0+0x40/0x25c __kmem_cache_alloc_node+0x60/0x1cc __kmalloc+0xd8/0x100 topology_parse_cpu_capacity+0x8c/0x178 get_cpu_for_node+0x88/0xc4 parse_cluster+0x1b0/0x28c parse_cluster+0x8c/0x28c init_cpu_topology+0x168/0x188 smp_prepare_cpus+0x24/0xf8 kernel_init_freeable+0x18c/0x34c kernel_init+0x30/0x134 ret_from_fork+0x10/0x20 -> #2 (fs_reclaim){+.+.}-{0:0}: __fs_reclaim_acquire+0x3c/0x48 fs_reclaim_acquire+0x54/0xa8 slab_pre_alloc_hook.constprop.0+0x40/0x25c __kmem_cache_alloc_node+0x60/0x1cc __kmalloc+0xd8/0x100 kzalloc.constprop.0+0x14/0x20 icc_node_create_nolock+0x4c/0xc4 icc_node_create+0x38/0x58 qcom_icc_rpmh_probe+0x1b8/0x248 platform_probe+0x70/0xc4 really_probe+0x158/0x290 __driver_probe_device+0xc8/0xe0 driver_probe_device+0x44/0x100 __driver_attach+0xf8/0x108 bus_for_each_dev+0x78/0xc4 driver_attach+0x2c/0x38 bus_add_driver+0xd0/0x1d8 driver_register+0xbc/0xf8 __platform_driver_register+0x30/0x3c qnoc_driver_init+0x24/0x30 do_one_initcall+0x104/0x2bc kernel_init_freeable+0x344/0x34c kernel_init+0x30/0x134 ret_from_fork+0x10/0x20 -> #1 (icc_lock){+.+.}-{3:3}: __mutex_lock+0xcc/0x3c8 mutex_lock_nested+0x30/0x44 icc_set_bw+0x88/0x2b4 _set_opp_bw+0x8c/0xd8 _set_opp+0x19c/0x300 dev_pm_opp_set_opp+0x84/0x94 a6xx_gmu_resume+0x18c/0x804 a6xx_pm_resume+0xf8/0x234 adreno_runtime_resume+0x2c/0x38 pm_generic_runtime_resume+0x30/0x44 __rpm_callback+0x15c/0x174 rpm_callback+0x78/0x7c rpm_resume+0x318/0x524 __pm_runtime_resume+0x78/0xbc adreno_load_gpu+0xc4/0x17c msm_open+0x50/0x120 drm_file_alloc+0x17c/0x228 drm_open_helper+0x74/0x118 drm_open+0xa0/0x144 drm_stub_open+0xd4/0xe4 chrdev_open+0x1b8/0x1e4 do_dentry_open+0x2f8/0x38c vfs_open+0x34/0x40 path_openat+0x64c/0x7b4 do_filp_open+0x54/0xc4 do_sys_openat2+0x9c/0x100 do_sys_open+0x50/0x7c __arm64_sys_openat+0x28/0x34 invoke_syscall+0x8c/0x128 el0_svc_common.constprop.0+0xa0/0x11c do_el0_svc+0xac/0xbc el0_svc+0x48/0xa0 el0t_64_sync_handler+0xac/0x13c el0t_64_sync+0x190/0x194 -> #0 (&gmu->lock){+.+.}-{3:3}: __lock_acquire+0xe00/0x1060 lock_acquire+0x1e0/0x2f8 __mutex_lock+0xcc/0x3c8 mutex_lock_nested+0x30/0x44 a6xx_pm_resume+0xf0/0x234 adreno_runtime_resume+0x2c/0x38 pm_generic_runtime_resume+0x30/0x44 __rpm_callback+0x15c/0x174 rpm_callback+0x78/0x7c rpm_resume+0x318/0x524 __pm_runtime_resume+0x78/0xbc pm_runtime_get_sync.isra.0+0x14/0x20 msm_gpu_submit+0x58/0x178 msm_job_run+0x78/0x150 drm_sched_main+0x290/0x370 kthread+0xf0/0x100 ret_from_fork+0x10/0x20 other info that might help us debug this: Chain exists of: &gmu->lock --> mmu_notifier_invalidate_range_start --> dma_fence_map Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(dma_fence_map); lock(mmu_notifier_invalidate_range_start); lock(dma_fence_map); lock(&gmu->lock); *** DEADLOCK *** 2 locks held by ring0/132: #0: ffffff8087191170 (&gpu->lock){+.+.}-{3:3}, at: msm_job_run+0x64/0x150 #1: ffffffdb5aee57e8 (dma_fence_map){++++}-{0:0}, at: msm_job_run+0x68/0x150 stack backtrace: CPU: 7 PID: 132 Comm: ring0 Not tainted 6.2.0-rc8-debug+ #554 Hardware name: Google Lazor (rev1 - 2) with LTE (DT) Call trace: dump_backtrace.part.0+0xb4/0xf8 show_stack+0x20/0x38 dump_stack_lvl+0x9c/0xd0 dump_stack+0x18/0x34 print_circular_bug+0x1b4/0x1f0 check_noncircular+0x78/0xac __lock_acquire+0xe00/0x1060 lock_acquire+0x1e0/0x2f8 __mutex_lock+0xcc/0x3c8 mutex_lock_nested+0x30/0x44 a6xx_pm_resume+0xf0/0x234 adreno_runtime_resume+0x2c/0x38 pm_generic_runtime_resume+0x30/0x44 __rpm_callback+0x15c/0x174 rpm_callback+0x78/0x7c rpm_resume+0x318/0x524 __pm_runtime_resume+0x78/0xbc pm_runtime_get_sync.isra.0+0x14/0x20 msm_gpu_submit+0x58/0x178 msm_job_run+0x78/0x150 drm_sched_main+0x290/0x370 kthread+0xf0/0x100 ret_from_fork+0x10/0x20 Signed-off-by: Rob Clark --- drivers/interconnect/core.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/drivers/interconnect/core.c b/drivers/interconnect/core.c index 5fac448c28fd..e15a92a79df1 100644 --- a/drivers/interconnect/core.c +++ b/drivers/interconnect/core.c @@ -28,6 +28,7 @@ static LIST_HEAD(icc_providers); static int providers_count; static bool synced_state; static DEFINE_MUTEX(icc_lock); +static DEFINE_MUTEX(icc_bw_lock); static struct dentry *icc_debugfs_dir; static void icc_summary_show_one(struct seq_file *s, struct icc_node *n) @@ -631,7 +632,7 @@ int icc_set_bw(struct icc_path *path, u32 avg_bw, u32 peak_bw) if (WARN_ON(IS_ERR(path) || !path->num_nodes)) return -EINVAL; - mutex_lock(&icc_lock); + mutex_lock(&icc_bw_lock); old_avg = path->reqs[0].avg_bw; old_peak = path->reqs[0].peak_bw; @@ -663,7 +664,7 @@ int icc_set_bw(struct icc_path *path, u32 avg_bw, u32 peak_bw) apply_constraints(path); } - mutex_unlock(&icc_lock); + mutex_unlock(&icc_bw_lock); trace_icc_set_bw_end(path, ret); @@ -872,6 +873,7 @@ void icc_node_add(struct icc_node *node, struct icc_provider *provider) return; mutex_lock(&icc_lock); + mutex_lock(&icc_bw_lock); node->provider = provider; list_add_tail(&node->node_list, &provider->nodes); @@ -900,6 +902,7 @@ void icc_node_add(struct icc_node *node, struct icc_provider *provider) node->avg_bw = 0; node->peak_bw = 0; + mutex_unlock(&icc_bw_lock); mutex_unlock(&icc_lock); } EXPORT_SYMBOL_GPL(icc_node_add); @@ -1025,6 +1028,7 @@ void icc_sync_state(struct device *dev) return; mutex_lock(&icc_lock); + mutex_lock(&icc_bw_lock); synced_state = true; list_for_each_entry(p, &icc_providers, provider_list) { dev_dbg(p->dev, "interconnect provider is in synced state\n"); From patchwork Tue Aug 22 18:01:54 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Rob Clark X-Patchwork-Id: 13361317 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5E2C1EE49B1 for ; Tue, 22 Aug 2023 18:02:54 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229764AbjHVSCy (ORCPT ); Tue, 22 Aug 2023 14:02:54 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36506 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229731AbjHVSCs (ORCPT ); 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Tue, 22 Aug 2023 11:02:44 -0700 (PDT) From: Rob Clark To: dri-devel@lists.freedesktop.org Cc: linux-arm-msm@vger.kernel.org, freedreno@lists.freedesktop.org, Rob Clark , Georgi Djakov , linux-pm@vger.kernel.org (open list:INTERCONNECT API), linux-kernel@vger.kernel.org (open list) Subject: [PATCH v5 07/11] interconnect: Teach lockdep about icc_bw_lock order Date: Tue, 22 Aug 2023 11:01:54 -0700 Message-ID: <20230822180208.95556-8-robdclark@gmail.com> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20230822180208.95556-1-robdclark@gmail.com> References: <20230822180208.95556-1-robdclark@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org From: Rob Clark Teach lockdep that icc_bw_lock is needed in code paths that could deadlock if they trigger reclaim. Signed-off-by: Rob Clark --- drivers/interconnect/core.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) diff --git a/drivers/interconnect/core.c b/drivers/interconnect/core.c index e15a92a79df1..1afbc4f7c6e7 100644 --- a/drivers/interconnect/core.c +++ b/drivers/interconnect/core.c @@ -1041,13 +1041,21 @@ void icc_sync_state(struct device *dev) } } } + mutex_unlock(&icc_bw_lock); mutex_unlock(&icc_lock); } EXPORT_SYMBOL_GPL(icc_sync_state); static int __init icc_init(void) { - struct device_node *root = of_find_node_by_path("/"); + struct device_node *root; + + /* Teach lockdep about lock ordering wrt. shrinker: */ + fs_reclaim_acquire(GFP_KERNEL); + might_lock(&icc_bw_lock); + fs_reclaim_release(GFP_KERNEL); + + root = of_find_node_by_path("/"); providers_count = of_count_icc_providers(root); of_node_put(root);