From patchwork Tue Jul 28 05:00:57 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Can Guo X-Patchwork-Id: 11688133 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 0368D722 for ; Tue, 28 Jul 2020 05:03:35 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E2F2621744 for ; Tue, 28 Jul 2020 05:03:34 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726631AbgG1FDb (ORCPT ); Tue, 28 Jul 2020 01:03:31 -0400 Received: from labrats.qualcomm.com ([199.106.110.90]:17171 "EHLO labrats.qualcomm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726290AbgG1FDb (ORCPT ); Tue, 28 Jul 2020 01:03:31 -0400 IronPort-SDR: B7EdOlmVLo/SB0oIf74GFnD8vMJ90Zs77gTtBjgkhM+mzWFK/mQto+3jqLsSAxUWXP0k7j8Xgo qugIQiq4wZj3arFT0KosuOZhNTzt8liUw+pU/EqPehC9eBLuJMmzxOr9jAuTlfNRFL0zphfn5c qmgUN2DG1oRFwWHVzfuYKp5VtKcRhEIquflKaFKVDYhhhIN4tVK4QxA+7patyaM1TEra/9QjRt 7Rxsa7WAdJtfJqFIzJlZTpRTJXDTLFswCehK7HOdVK7mHuQFQh5ArugZCra14Mg0fNmiYRQ0Op ciE= X-IronPort-AV: E=Sophos;i="5.75,405,1589266800"; d="scan'208";a="29056443" Received: from unknown (HELO ironmsg04-sd.qualcomm.com) ([10.53.140.144]) by labrats.qualcomm.com with ESMTP; 27 Jul 2020 22:01:30 -0700 Received: from pacamara-linux.qualcomm.com ([192.168.140.135]) by ironmsg04-sd.qualcomm.com with ESMTP; 27 Jul 2020 22:01:29 -0700 Received: by pacamara-linux.qualcomm.com (Postfix, from userid 359480) id 45DC322DA6; Mon, 27 Jul 2020 22:01:29 -0700 (PDT) From: Can Guo To: asutoshd@codeaurora.org, nguyenb@codeaurora.org, hongwus@codeaurora.org, rnayak@codeaurora.org, sh425.lee@samsung.com, linux-scsi@vger.kernel.org, kernel-team@android.com, saravanak@google.com, salyzyn@google.com, cang@codeaurora.org Cc: Alim Akhtar , Avri Altman , "James E.J. Bottomley" , "Martin K. Petersen" , Stanley Chu , Bean Huo , Bart Van Assche , Satya Tangirala , linux-kernel@vger.kernel.org (open list) Subject: [PATCH v7 6/8] scsi: ufs: Recover hba runtime PM error in error handler Date: Mon, 27 Jul 2020 22:00:57 -0700 Message-Id: <1595912460-8860-7-git-send-email-cang@codeaurora.org> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1595912460-8860-1-git-send-email-cang@codeaurora.org> References: <1595912460-8860-1-git-send-email-cang@codeaurora.org> Sender: linux-scsi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org Current error handler cannot work well or recover hba runtime PM error if ufshcd_suspend/resume has failed due to UFS errors, e.g. hibern8 enter/exit error or SSU cmd error. When this happens, error handler may fail doing full reset and restore because error handler always assumes that powers, IRQs and clocks are ready after pm_runtime_get_sync returns, but actually they are not if ufshcd_reusme fails [1]. Besides, if ufschd_suspend/resume fails due to UFS error, runtime PM framework saves the error value to dev.power.runtime_error. After that, hba dev runtime suspend/resume would not be invoked anymore unless runtime_error is cleared [2]. In case of ufshcd_suspend/resume fails due to UFS errors, for scenario [1], error handler cannot assume anything of pm_runtime_get_sync, meaning error handler should explicitly turn ON powers, IRQs and clocks again. To get the hba runtime PM work as regard for scenario [2], error handler can clear the runtime_error by calling pm_runtime_set_active() if full reset and restore succeeds. And, more important, if pm_runtime_set_active() returns no error, which means runtime_error has been cleared, we also need to resume those scsi devices under hba in case any of them has failed to be resumed due to hba runtime resume failure. This is to unblock blk_queue_enter in case there are bios waiting inside it. In addition, if ufshcd_resume errors out, ufshcd_release in ufshcd_resume would be skipped. After hba runtime PM error is recovered in error handler, we should do ufshcd_release once to get clock gating back to work. Signed-off-by: Can Guo --- drivers/scsi/ufs/ufshcd.c | 91 +++++++++++++++++++++++++++++++++++++++++++---- drivers/scsi/ufs/ufshcd.h | 1 + 2 files changed, 86 insertions(+), 6 deletions(-) diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c index c2d7a90..c480823 100644 --- a/drivers/scsi/ufs/ufshcd.c +++ b/drivers/scsi/ufs/ufshcd.c @@ -15,6 +15,7 @@ #include #include #include +#include #include "ufshcd.h" #include "ufs_quirks.h" #include "unipro.h" @@ -229,6 +230,10 @@ static irqreturn_t ufshcd_intr(int irq, void *__hba); static int ufshcd_change_power_mode(struct ufs_hba *hba, struct ufs_pa_layer_attr *pwr_mode); static void ufshcd_schedule_eh_work(struct ufs_hba *hba); +static int ufshcd_setup_hba_vreg(struct ufs_hba *hba, bool on); +static int ufshcd_setup_vreg(struct ufs_hba *hba, bool on); +static inline int ufshcd_config_vreg_hpm(struct ufs_hba *hba, + struct ufs_vreg *vreg); static int ufshcd_wb_buf_flush_enable(struct ufs_hba *hba); static int ufshcd_wb_buf_flush_disable(struct ufs_hba *hba); static int ufshcd_wb_ctrl(struct ufs_hba *hba, bool enable); @@ -5553,6 +5558,78 @@ static inline void ufshcd_schedule_eh_work(struct ufs_hba *hba) } } +static void ufshcd_err_handling_prepare(struct ufs_hba *hba) +{ + pm_runtime_get_sync(hba->dev); + if (pm_runtime_status_suspended(hba->dev)) { + /* + * Don't assume anything of pm_runtime_get_sync(), if + * resume fails, irq and clocks can be OFF, and powers + * can be OFF or in LPM. + */ + ufshcd_setup_hba_vreg(hba, true); + ufshcd_setup_clocks(hba, true); + ufshcd_enable_irq(hba); + ufshcd_setup_vreg(hba, true); + ufshcd_config_vreg_hpm(hba, hba->vreg_info.vccq); + ufshcd_config_vreg_hpm(hba, hba->vreg_info.vccq2); + ufshcd_vops_resume(hba, UFS_RUNTIME_PM); + } + ufshcd_hold(hba, false); + if (ufshcd_is_clkscaling_supported(hba)) { + cancel_work_sync(&hba->clk_scaling.suspend_work); + cancel_work_sync(&hba->clk_scaling.resume_work); + ufshcd_suspend_clkscaling(hba); + } +} + +static void ufshcd_err_handling_unprepare(struct ufs_hba *hba) +{ + /* If clk_gating is held by pm ops, release it */ + if (pm_runtime_active(hba->dev) && hba->clk_gating.held_by_pm) { + hba->clk_gating.held_by_pm = false; + ufshcd_release(hba); + } + ufshcd_release(hba); + if (ufshcd_is_clkscaling_supported(hba)) + ufshcd_resume_clkscaling(hba); + pm_runtime_put(hba->dev); +} + +#ifdef CONFIG_PM +static void ufshcd_recover_pm_error(struct ufs_hba *hba) +{ + struct Scsi_Host *shost = hba->host; + struct scsi_device *sdev; + struct request_queue *q; + int ret; + + /* + * Set RPM status of hba device to RPM_ACTIVE, + * this also clears its runtime error. + */ + ret = pm_runtime_set_active(hba->dev); + /* + * If hba device had runtime error, we also need to resume those + * scsi devices under hba in case any of them has failed to be + * resumed due to hba runtime resume failure. This is to unblock + * blk_queue_enter in case there are bios waiting inside it. + */ + if (!ret) { + list_for_each_entry(sdev, &shost->__devices, siblings) { + q = sdev->request_queue; + if (q->dev && (q->rpm_status == RPM_SUSPENDED || + q->rpm_status == RPM_SUSPENDING)) + pm_request_resume(q->dev); + } + } +} +#else +static inline void ufshcd_recover_pm_error(struct ufs_hba *hba) +{ +} +#endif + /** * ufshcd_err_handler - handle UFS errors that require s/w attention * @work: pointer to work structure @@ -5580,9 +5657,7 @@ static void ufshcd_err_handler(struct work_struct *work) } ufshcd_set_eh_in_progress(hba); spin_unlock_irqrestore(hba->host->host_lock, flags); - pm_runtime_get_sync(hba->dev); - ufshcd_hold(hba, false); - + ufshcd_err_handling_prepare(hba); spin_lock_irqsave(hba->host->host_lock, flags); hba->ufshcd_state = UFSHCD_STATE_RESET; @@ -5661,10 +5736,12 @@ static void ufshcd_err_handler(struct work_struct *work) hba->force_reset = false; spin_unlock_irqrestore(hba->host->host_lock, flags); err = ufshcd_reset_and_restore(hba); - spin_lock_irqsave(hba->host->host_lock, flags); if (err) dev_err(hba->dev, "%s: reset and restore failed with err %d\n", __func__, err); + else + ufshcd_recover_pm_error(hba); + spin_lock_irqsave(hba->host->host_lock, flags); } skip_err_handling: @@ -5679,8 +5756,7 @@ static void ufshcd_err_handler(struct work_struct *work) ufshcd_clear_eh_in_progress(hba); spin_unlock_irqrestore(hba->host->host_lock, flags); ufshcd_scsi_unblock_requests(hba); - ufshcd_release(hba); - pm_runtime_put_sync(hba->dev); + ufshcd_err_handling_unprepare(hba); } /** @@ -8232,6 +8308,7 @@ static int ufshcd_suspend(struct ufs_hba *hba, enum ufs_pm_op pm_op) * just gate the clocks. */ ufshcd_hold(hba, false); + hba->clk_gating.held_by_pm = true; hba->clk_gating.is_suspended = true; if (hba->clk_scaling.is_allowed) { @@ -8351,6 +8428,7 @@ static int ufshcd_suspend(struct ufs_hba *hba, enum ufs_pm_op pm_op) hba->clk_gating.is_suspended = false; hba->dev_info.b_rpm_dev_flush_capable = false; ufshcd_release(hba); + hba->clk_gating.held_by_pm = false; out: if (hba->dev_info.b_rpm_dev_flush_capable) { schedule_delayed_work(&hba->rpm_dev_flush_recheck_work, @@ -8457,6 +8535,7 @@ static int ufshcd_resume(struct ufs_hba *hba, enum ufs_pm_op pm_op) /* Schedule clock gating in case of no access to UFS device yet */ ufshcd_release(hba); + hba->clk_gating.held_by_pm = false; goto out; diff --git a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h index 83e5cd9..585e58b 100644 --- a/drivers/scsi/ufs/ufshcd.h +++ b/drivers/scsi/ufs/ufshcd.h @@ -354,6 +354,7 @@ struct ufs_clk_gating { struct device_attribute delay_attr; struct device_attribute enable_attr; bool is_enabled; + bool held_by_pm; int active_reqs; struct workqueue_struct *clk_gating_workq; };