From nobody Thu Sep 19 19:31:21 2024 Received: from mailgw01.mediatek.com (unknown [60.244.123.138]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id AC6483FE3F for ; Wed, 8 May 2024 09:51:49 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=60.244.123.138 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1715161912; cv=none; b=toCZnrIQVeFXS1j8Q5/Clk8CTrpqY1pb8C/hBP71YvV7tkztnnzqZODzBP/llJOek2/fBA0anua/gQg16geyOG2aUSB/1kAmwzPajsZhMG2rMoNzPTLGuBzAGDcykm2gGFuOIPcAlMC5qh7+YUhQSKlUHd/QWwoKlo6e0BQdlxE= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1715161912; c=relaxed/simple; bh=YOsEbjWcfZIpD15f+HkcOc4BQjQkE+PFSvOypW0kM/Q=; h=From:To:CC:Subject:Date:Message-ID:MIME-Version:Content-Type; b=Bqm7YsXrpRGIIqH76c15uoYQp4WLkbryAH//SiROc0Sx/xcL5SQP/H1l4vhwPaIQOpzeUXtKvpPF+wqDeFoxQ/Y1LMh2xH3/rupxGFfr9YbuN+EY+CHHfj0vy8ylLZPyitmr61eURZgqaGEuHTjnteDvUZk02qnYU0kQ3VeQ+iI= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=mediatek.com; spf=pass smtp.mailfrom=mediatek.com; dkim=pass (1024-bit key) header.d=mediatek.com header.i=@mediatek.com header.b=bFSwIteg; arc=none smtp.client-ip=60.244.123.138 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=mediatek.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=mediatek.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=mediatek.com header.i=@mediatek.com header.b="bFSwIteg" X-UUID: 9416d58e0d2011efb92737409a0e9459-20240508 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=mediatek.com; s=dk; h=Content-Type:MIME-Version:Message-ID:Date:Subject:CC:To:From; bh=EpbT5fkgin4b8SqQc5adWxDC5bZ2ttTXku30oyuQHbw=; b=bFSwItegwhH7VnuTFtnAqYOAtfLYcKtr2df+Ukm1X2pAdf7MtT8plA9bjhH26C420GOkPWT+aLD/37abeBL3850QrVbXMlN7dnFl9OtzF2IXoO+v9f9fSyvMEMkEG7z8HjcXwQfXQurr32CtaZAFgFgcM7glNxHk6nunfw8iRRc=; X-CID-P-RULE: Release_Ham X-CID-O-INFO: VERSION:1.1.38,REQID:dd9d5ad5-4e05-4884-9de1-38c3080c3812,IP:0,U RL:0,TC:0,Content:0,EDM:0,RT:0,SF:0,FILE:0,BULK:0,RULE:Release_Ham,ACTION: release,TS:0 X-CID-META: VersionHash:82c5f88,CLOUDID:a5b68092-e2c0-40b0-a8fe-7c7e47299109,B ulkID:nil,BulkQuantity:0,Recheck:0,SF:102,TC:nil,Content:0,EDM:-3,IP:nil,U RL:11|1,File:nil,RT:nil,Bulk:nil,QS:nil,BEC:nil,COL:0,OSI:0,OSA:0,AV:0,LES :1,SPR:NO,DKR:0,DKP:0,BRR:0,BRE:0 X-CID-BVR: 0,NGT X-CID-BAS: 0,NGT,0,_ X-CID-FACTOR: TF_CID_SPAM_SNR,TF_CID_SPAM_ULN X-UUID: 9416d58e0d2011efb92737409a0e9459-20240508 Received: from mtkmbs13n1.mediatek.inc [(172.21.101.193)] by mailgw01.mediatek.com (envelope-from ) (Generic MTA with TLSv1.2 ECDHE-RSA-AES256-GCM-SHA384 256/256) with ESMTP id 583157918; Wed, 08 May 2024 17:51:44 +0800 Received: from mtkmbs11n2.mediatek.inc (172.21.101.187) by mtkmbs13n1.mediatek.inc (172.21.101.193) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1118.26; Wed, 8 May 2024 17:51:43 +0800 Received: from mtksdccf07.mediatek.inc (172.21.84.99) by mtkmbs11n2.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.2.1118.26 via Frontend Transport; Wed, 8 May 2024 17:51:43 +0800 From: Jason-JH.Lin To: Chun-Kuang Hu CC: AngeloGioacchino Del Regno , Alexandre Mergnat , Jason-ch Chen , Johnson Wang , "Jason-JH . Lin" , Singo Chang , Nancy Lin , Shawn Sung , , , , , , Fei Shao Subject: [PATCH v2] mailbox: mtk-cmdq: Fix sleeping function called from invalid context Date: Wed, 8 May 2024 17:51:43 +0800 Message-ID: <20240508095143.12023-1-jason-jh.lin@mediatek.com> X-Mailer: git-send-email 2.18.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MTK: N Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" When we run kernel with lockdebug option, we will get the BUG below: [ 106.692124] BUG: sleeping function called from invalid context at driver= s/base/power/runtime.c:1164 [ 106.692190] in_atomic(): 1, irqs_disabled(): 128, non_block: 0, pid: 361= 6, name: kworker/u17:3 [ 106.692226] preempt_count: 1, expected: 0 [ 106.692254] RCU nest depth: 0, expected: 0 [ 106.692282] INFO: lockdep is turned off. [ 106.692306] irq event stamp: 0 [ 106.692331] hardirqs last enabled at (0): [<0000000000000000>] 0x0 [ 106.692376] hardirqs last disabled at (0): [] copy_pro= cess+0xc90/0x2ac0 [ 106.692429] softirqs last enabled at (0): [] copy_pro= cess+0xcb4/0x2ac0 [ 106.692473] softirqs last disabled at (0): [<0000000000000000>] 0x0 [ 106.692513] CPU: 1 PID: 3616 Comm: kworker/u17:3 Not tainted 6.1.87-lock= dep-14133-g26e933aca785 #1 6839942e1cf34914b0a366137843dd2366f52aa9 [ 106.692556] Hardware name: Google Ciri sku0/unprovisioned board (DT) [ 106.692586] Workqueue: imgsys_runner imgsys_runner_func [ 106.692638] Call trace: [ 106.692662] dump_backtrace+0x100/0x120 [ 106.692702] show_stack+0x20/0x2c [ 106.692737] dump_stack_lvl+0x84/0xb4 [ 106.692775] dump_stack+0x18/0x48 [ 106.692809] __might_resched+0x354/0x4c0 [ 106.692847] __might_sleep+0x98/0xe4 [ 106.692883] __pm_runtime_resume+0x70/0x124 [ 106.692921] cmdq_mbox_send_data+0xe4/0xb1c [ 106.692964] msg_submit+0x194/0x2dc [ 106.693003] mbox_send_message+0x190/0x330 [ 106.693043] imgsys_cmdq_sendtask+0x1618/0x2224 [ 106.693082] imgsys_runner_func+0xac/0x11c [ 106.693118] process_one_work+0x638/0xf84 [ 106.693158] worker_thread+0x808/0xcd0 [ 106.693196] kthread+0x24c/0x324 [ 106.693231] ret_from_fork+0x10/0x20 We found that there is a spin_lock_irqsave protection in msg_submit() of mailbox.c and it is in the atomic context. So when cmdq driver calls pm_runtime_get_sync() in cmdq_mbox_send_data(), it will get this BUG report. 1. Change pm_runtime_get_sync() to pm_runtime_get() to avoid using sleep in atomic context. 2. Move clk_bulk_enable() outside cmdq_runtime_resume() to ensure GCE clocks are enabled before configuring GCE register. 3. Add used_count to avoid cmdq_runtime_suspend() being called before calling cmdq_runtime_resume(). Fixes: 8afe816b0c99 ("mailbox: mtk-cmdq-mailbox: Implement Runtime PM with = autosuspend") Signed-off-by: Jason-JH.Lin --- drivers/mailbox/mtk-cmdq-mailbox.c | 24 +++++++++++++++--------- 1 file changed, 15 insertions(+), 9 deletions(-) diff --git a/drivers/mailbox/mtk-cmdq-mailbox.c b/drivers/mailbox/mtk-cmdq-= mailbox.c index 033aff11f87c..b50f42e69aab 100644 --- a/drivers/mailbox/mtk-cmdq-mailbox.c +++ b/drivers/mailbox/mtk-cmdq-mailbox.c @@ -82,6 +82,7 @@ struct cmdq { const struct gce_plat *pdata; struct cmdq_thread *thread; struct clk_bulk_data clocks[CMDQ_GCE_NUM_MAX]; + atomic_t used_count; bool suspended; }; =20 @@ -317,14 +318,21 @@ static int cmdq_runtime_resume(struct device *dev) { struct cmdq *cmdq =3D dev_get_drvdata(dev); =20 - return clk_bulk_enable(cmdq->pdata->gce_num, cmdq->clocks); + atomic_inc(&cmdq->used_count); + return 0; } =20 static int cmdq_runtime_suspend(struct device *dev) { struct cmdq *cmdq =3D dev_get_drvdata(dev); =20 + if (atomic_read(&cmdq->used_count) =3D=3D 0) { + dev_warn(dev, "%s when used_count is 0!", __func__); + return -EINVAL; + } + clk_bulk_disable(cmdq->pdata->gce_num, cmdq->clocks); + atomic_dec(&cmdq->used_count); return 0; } =20 @@ -392,9 +400,8 @@ static int cmdq_mbox_send_data(struct mbox_chan *chan, = void *data) /* Client should not flush new tasks if suspended. */ WARN_ON(cmdq->suspended); =20 - ret =3D pm_runtime_get_sync(cmdq->mbox.dev); - if (ret < 0) - return ret; + WARN_ON(pm_runtime_get(cmdq->mbox.dev) < 0); + WARN_ON(clk_bulk_enable(cmdq->pdata->gce_num, cmdq->clocks)); =20 task =3D kzalloc(sizeof(*task), GFP_ATOMIC); if (!task) { @@ -465,7 +472,8 @@ static void cmdq_mbox_shutdown(struct mbox_chan *chan) struct cmdq_task *task, *tmp; unsigned long flags; =20 - WARN_ON(pm_runtime_get_sync(cmdq->mbox.dev) < 0); + WARN_ON(pm_runtime_get(cmdq->mbox.dev) < 0); + WARN_ON(clk_bulk_enable(cmdq->pdata->gce_num, cmdq->clocks)); =20 spin_lock_irqsave(&thread->chan->lock, flags); if (list_empty(&thread->task_busy_list)) @@ -507,11 +515,9 @@ static int cmdq_mbox_flush(struct mbox_chan *chan, uns= igned long timeout) struct cmdq_task *task, *tmp; unsigned long flags; u32 enable; - int ret; =20 - ret =3D pm_runtime_get_sync(cmdq->mbox.dev); - if (ret < 0) - return ret; + WARN_ON(pm_runtime_get(cmdq->mbox.dev) < 0); + WARN_ON(clk_bulk_enable(cmdq->pdata->gce_num, cmdq->clocks)); =20 spin_lock_irqsave(&thread->chan->lock, flags); if (list_empty(&thread->task_busy_list)) --=20 2.18.0