From patchwork Thu Aug 31 13:08:25 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: =?utf-8?b?UGV0ZXIgV2FuZyAo546L5L+h5Y+LKQ==?= X-Patchwork-Id: 719322 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 9A10AC83F34 for ; Thu, 31 Aug 2023 13:08:45 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S244263AbjHaNIq (ORCPT ); Thu, 31 Aug 2023 09:08:46 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58046 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S243868AbjHaNIm (ORCPT ); Thu, 31 Aug 2023 09:08:42 -0400 Received: from mailgw01.mediatek.com (unknown [60.244.123.138]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0A0BB1A4 for ; Thu, 31 Aug 2023 06:08:37 -0700 (PDT) X-UUID: 7bee11f247ff11ee99480b3a0002f391-20230831 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=mediatek.com; s=dk; h=Content-Type:MIME-Version:References:In-Reply-To:Message-ID:Date:Subject:CC:To:From; bh=vpMcaEyrAdaGuO54jgsDq+62Am9F9en4DBy1lZ6dSgs=; b=fBp5ulhT2YSuGFVmKl4wdQHtdK0ASEt4GtzWGweQwqdK1EenS9ZzmmRvt96nMHAJrQ0xiUkpswPXqw4NJw3bN1pvj4zJ958cSRpjrgJOOrZ3DWokIA3VeZNiF8yF8TN7mPfXYfU9flkUwj750Ya79kMPLop+4B4ZPVb2AhNBAOU=; X-CID-P-RULE: Release_Ham X-CID-O-INFO: VERSION:1.1.31, REQID:af51b50d-be34-46c9-8fa5-b78cc4654f1f, IP:0, U RL:0,TC:0,Content:-5,EDM:0,RT:0,SF:0,FILE:0,BULK:0,RULE:Release_Ham,ACTION :release,TS:-5 X-CID-META: VersionHash:0ad78a4, CLOUDID:929c6813-4929-4845-9571-38c601e9c3c9, B ulkID:nil,BulkQuantity:0,Recheck:0,SF:102,TC:nil,Content:0,EDM:-3,IP:nil,U RL:11|1,File: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 X-CID-BAS: 0,_,0,_ X-CID-FACTOR: TF_CID_SPAM_SNR,TF_CID_SPAM_ULN X-UUID: 7bee11f247ff11ee99480b3a0002f391-20230831 Received: from mtkmbs11n2.mediatek.inc [(172.21.101.187)] by mailgw01.mediatek.com (envelope-from ) (Generic MTA with TLSv1.2 ECDHE-RSA-AES256-GCM-SHA384 256/256) with ESMTP id 553812745; Thu, 31 Aug 2023 21:08:31 +0800 Received: from mtkmbs11n1.mediatek.inc (172.21.101.185) by mtkmbs10n2.mediatek.inc (172.21.101.183) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1118.26; Thu, 31 Aug 2023 21:08:30 +0800 Received: from mtksdccf07.mediatek.inc (172.21.84.99) by mtkmbs11n1.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.2.1118.26 via Frontend Transport; Thu, 31 Aug 2023 21:08:30 +0800 From: To: , , , , , CC: , , , , , , , , , , , , , Subject: [PATCH v2 2/3] ufs: core: fix abnormal scale up after last cmd finish Date: Thu, 31 Aug 2023 21:08:25 +0800 Message-ID: <20230831130826.5592-3-peter.wang@mediatek.com> X-Mailer: git-send-email 2.18.0 In-Reply-To: <20230831130826.5592-1-peter.wang@mediatek.com> References: <20230831130826.5592-1-peter.wang@mediatek.com> MIME-Version: 1.0 X-MTK: N Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org From: Peter Wang When ufshcd_clk_scaling_suspend_work(Thread A) running and new command coming, ufshcd_clk_scaling_start_busy(Thread B) may get host_lock after Thread A first time release host_lock. Then Thread A second time get host_lock will set clk_scaling.window_start_t = 0 which scale up clock abnormal next polling_ms time. Also inlines another __ufshcd_suspend_clkscaling calls. Below is racing step: 1 hba->clk_scaling.suspend_work (Thread A) ufshcd_clk_scaling_suspend_work 2 spin_lock_irqsave(hba->host->host_lock, irq_flags); 3 hba->clk_scaling.is_suspended = true; 4 spin_unlock_irqrestore(hba->host->host_lock, irq_flags); __ufshcd_suspend_clkscaling 7 spin_lock_irqsave(hba->host->host_lock, flags); 8 hba->clk_scaling.window_start_t = 0; 9 spin_unlock_irqrestore(hba->host->host_lock, flags); ufshcd_send_command (Thread B) ufshcd_clk_scaling_start_busy 5 spin_lock_irqsave(hba->host->host_lock, flags); .... 6 spin_unlock_irqrestore(hba->host->host_lock, flags); Signed-off-by: Peter Wang Reviewed-by: Bart Van Assche --- drivers/ufs/core/ufshcd.c | 17 ++++------------- 1 file changed, 4 insertions(+), 13 deletions(-) diff --git a/drivers/ufs/core/ufshcd.c b/drivers/ufs/core/ufshcd.c index e3672e55efae..057549b0e586 100644 --- a/drivers/ufs/core/ufshcd.c +++ b/drivers/ufs/core/ufshcd.c @@ -275,7 +275,6 @@ static inline void ufshcd_add_delay_before_dme_cmd(struct ufs_hba *hba); static int ufshcd_host_reset_and_restore(struct ufs_hba *hba); static void ufshcd_resume_clkscaling(struct ufs_hba *hba); static void ufshcd_suspend_clkscaling(struct ufs_hba *hba); -static void __ufshcd_suspend_clkscaling(struct ufs_hba *hba); static int ufshcd_scale_clks(struct ufs_hba *hba, bool scale_up); static irqreturn_t ufshcd_intr(int irq, void *__hba); static int ufshcd_change_power_mode(struct ufs_hba *hba, @@ -1385,9 +1384,10 @@ static void ufshcd_clk_scaling_suspend_work(struct work_struct *work) return; } hba->clk_scaling.is_suspended = true; + hba->clk_scaling.window_start_t = 0; spin_unlock_irqrestore(hba->host->host_lock, irq_flags); - __ufshcd_suspend_clkscaling(hba); + devfreq_suspend_device(hba->devfreq); } static void ufshcd_clk_scaling_resume_work(struct work_struct *work) @@ -1564,16 +1564,6 @@ static void ufshcd_devfreq_remove(struct ufs_hba *hba) dev_pm_opp_remove(hba->dev, clki->max_freq); } -static void __ufshcd_suspend_clkscaling(struct ufs_hba *hba) -{ - unsigned long flags; - - devfreq_suspend_device(hba->devfreq); - spin_lock_irqsave(hba->host->host_lock, flags); - hba->clk_scaling.window_start_t = 0; - spin_unlock_irqrestore(hba->host->host_lock, flags); -} - static void ufshcd_suspend_clkscaling(struct ufs_hba *hba) { unsigned long flags; @@ -1586,11 +1576,12 @@ static void ufshcd_suspend_clkscaling(struct ufs_hba *hba) if (!hba->clk_scaling.is_suspended) { suspend = true; hba->clk_scaling.is_suspended = true; + hba->clk_scaling.window_start_t = 0; } spin_unlock_irqrestore(hba->host->host_lock, flags); if (suspend) - __ufshcd_suspend_clkscaling(hba); + devfreq_suspend_device(hba->devfreq); } static void ufshcd_resume_clkscaling(struct ufs_hba *hba)