From patchwork Thu Aug 6 05:06:13 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Can Guo X-Patchwork-Id: 257994 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=-13.0 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED, USER_AGENT_GIT autolearn=unavailable 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 5FF85C433F7 for ; Thu, 6 Aug 2020 11:01:00 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 414F52311E for ; Thu, 6 Aug 2020 11:00:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727936AbgHFFGb (ORCPT ); Thu, 6 Aug 2020 01:06:31 -0400 Received: from labrats.qualcomm.com ([199.106.110.90]:43690 "EHLO labrats.qualcomm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725271AbgHFFGb (ORCPT ); Thu, 6 Aug 2020 01:06:31 -0400 IronPort-SDR: OrPzJQe49KsA/iy+W2QtOfkyXJs192U7aGWiIcQSYRyKyhCiXxJ6yuzGEbOYpD9ZOJ9MuvFYeY DxJBlO+n9vCEcTxUziB/0qAHHNrI8vgbTj4LmbtwgrqDipTNcsHOWR/XJmK0C0vqSHkdtNYVOc m3t9rM8auUPz776fmxwPBoBirFM32VtHw8MCrnW3MAqKIY638c7uQ61BxREn6QTYs3sHYbZ5PA INrXPtVgaqCQhkdHDF0hG4iOK/N0sfWnNkt6Gk098KLLcFkzAalKmpAr/Rknh705J8HvxFZAJ1 kHA= X-IronPort-AV: E=Sophos;i="5.75,440,1589266800"; d="scan'208";a="29068254" Received: from unknown (HELO ironmsg02-sd.qualcomm.com) ([10.53.140.142]) by labrats.qualcomm.com with ESMTP; 05 Aug 2020 22:06:30 -0700 Received: from stor-presley.qualcomm.com ([192.168.140.85]) by ironmsg02-sd.qualcomm.com with ESMTP; 05 Aug 2020 22:06:29 -0700 Received: by stor-presley.qualcomm.com (Postfix, from userid 359480) id 8EF1A21562; Wed, 5 Aug 2020 22:06:29 -0700 (PDT) From: Can Guo To: asutoshd@codeaurora.org, nguyenb@codeaurora.org, hongwus@codeaurora.org, rnayak@codeaurora.org, linux-scsi@vger.kernel.org, kernel-team@android.com, saravanak@google.com, salyzyn@google.com, cang@codeaurora.org Cc: Andy Gross , Bjorn Andersson , Alim Akhtar , Avri Altman , "James E.J. Bottomley" , "Martin K. Petersen" , linux-arm-msm@vger.kernel.org (open list:ARM/QUALCOMM SUPPORT), linux-kernel@vger.kernel.org (open list) Subject: [PATCH 2/9] ufs: ufs-qcom: Fix race conditions caused by func ufs_qcom_testbus_config Date: Wed, 5 Aug 2020 22:06:13 -0700 Message-Id: <1596690383-16438-3-git-send-email-cang@codeaurora.org> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1596690383-16438-1-git-send-email-cang@codeaurora.org> References: <1596690383-16438-1-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 If ufs_qcom_dump_dbg_regs() calls ufs_qcom_testbus_config() from ufshcd_suspend/resume and/or clk gate/ungate context, pm_runtime_get_sync() and ufshcd_hold() will cause racing problems. Fix this by removing the unnecessary calls of pm_runtime_get_sync() and ufshcd_hold(). Signed-off-by: Can Guo Reviewed-by: Hongwu Su Reviewed-by: Avri Altman Reviewed-by: Bean Huo diff --git a/drivers/scsi/ufs/ufs-qcom.c b/drivers/scsi/ufs/ufs-qcom.c index d0d7552..823eccf 100644 --- a/drivers/scsi/ufs/ufs-qcom.c +++ b/drivers/scsi/ufs/ufs-qcom.c @@ -1614,9 +1614,6 @@ int ufs_qcom_testbus_config(struct ufs_qcom_host *host) */ } mask <<= offset; - - pm_runtime_get_sync(host->hba->dev); - ufshcd_hold(host->hba, false); ufshcd_rmwl(host->hba, TEST_BUS_SEL, (u32)host->testbus.select_major << 19, REG_UFS_CFG1); @@ -1629,8 +1626,6 @@ int ufs_qcom_testbus_config(struct ufs_qcom_host *host) * committed before returning. */ mb(); - ufshcd_release(host->hba); - pm_runtime_put_sync(host->hba->dev); return 0; } From patchwork Thu Aug 6 05:06:15 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Can Guo X-Patchwork-Id: 257993 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=-13.0 required=3.0 tests=BAYES_00, 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 C786EC43457 for ; Thu, 6 Aug 2020 11:01:00 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id ADF1D2250E for ; Thu, 6 Aug 2020 11:00:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728024AbgHFFGk (ORCPT ); Thu, 6 Aug 2020 01:06:40 -0400 Received: from labrats.qualcomm.com ([199.106.110.90]:1224 "EHLO labrats.qualcomm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726093AbgHFFGi (ORCPT ); Thu, 6 Aug 2020 01:06:38 -0400 IronPort-SDR: /LbLMqAkbayAgFHHSiWiFLUCIzCsXkSoguRdrRXl7WC8SDprWjcBK9o/7buzJRoeuNxJFalKJB W721WzZEk0IrP6jJo42hZTpjwXo2iNkNMHC5Avf4dD5QnTYJE0+41hBXqIgQ8toaiByfGtRof4 l4m0RtB7iiPo8ZCL1yd/HuWanc5QIVNjLeIDrSBqoRBaQ+8YlLjNMJUA3uhqVNmCnTdgrlnKD1 hBrB4VVcAp2lrOXTktN92p9Etj8YorUtVXXnZI/lbZSUQX3r0M5JwG/fj9Jr2c1C4Dzjj5PAgq +Y8= X-IronPort-AV: E=Sophos;i="5.75,440,1589266800"; d="scan'208";a="29068256" Received: from unknown (HELO ironmsg02-sd.qualcomm.com) ([10.53.140.142]) by labrats.qualcomm.com with ESMTP; 05 Aug 2020 22:06:37 -0700 Received: from stor-presley.qualcomm.com ([192.168.140.85]) by ironmsg02-sd.qualcomm.com with ESMTP; 05 Aug 2020 22:06:36 -0700 Received: by stor-presley.qualcomm.com (Postfix, from userid 359480) id A8DF721562; Wed, 5 Aug 2020 22:06:36 -0700 (PDT) From: Can Guo To: asutoshd@codeaurora.org, nguyenb@codeaurora.org, hongwus@codeaurora.org, rnayak@codeaurora.org, 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" , Matthias Brugger , Stanley Chu , Bean Huo , Bart Van Assche , Satya Tangirala , linux-kernel@vger.kernel.org (open list), linux-arm-kernel@lists.infradead.org (moderated list:ARM/Mediatek SoC support), linux-mediatek@lists.infradead.org (moderated list:ARM/Mediatek SoC support) Subject: [PATCH 4/9] scsi: ufs: Add some debug infos to ufshcd_print_host_state Date: Wed, 5 Aug 2020 22:06:15 -0700 Message-Id: <1596690383-16438-5-git-send-email-cang@codeaurora.org> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1596690383-16438-1-git-send-email-cang@codeaurora.org> References: <1596690383-16438-1-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 The infos of the last interrupt status and its timestamp are very helpful when debug system stability issues, e.g. IRQ starvation, so add them to ufshcd_print_host_state. Meanwhile, UFS device infos like model name and its FW version also come in handy during debug. In addition, this change makes cleanup to some prints in ufshcd_print_host_regs as similar prints are already available in ufshcd_print_host_state. Signed-off-by: Can Guo Reviewed-by: Avri Altman Reviewed-by: Hongwu Su Reviewed-by: Asutosh Das Reviewed-by: Stanley Chu Reviewed-by: Bean Huo diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c index 5acb38c..71c650f 100644 --- a/drivers/scsi/ufs/ufshcd.c +++ b/drivers/scsi/ufs/ufshcd.c @@ -411,15 +411,6 @@ static void ufshcd_print_err_hist(struct ufs_hba *hba, static void ufshcd_print_host_regs(struct ufs_hba *hba) { ufshcd_dump_regs(hba, 0, UFSHCI_REG_SPACE_SIZE, "host_regs: "); - dev_err(hba->dev, "hba->ufs_version = 0x%x, hba->capabilities = 0x%x\n", - hba->ufs_version, hba->capabilities); - dev_err(hba->dev, - "hba->outstanding_reqs = 0x%x, hba->outstanding_tasks = 0x%x\n", - (u32)hba->outstanding_reqs, (u32)hba->outstanding_tasks); - dev_err(hba->dev, - "last_hibern8_exit_tstamp at %lld us, hibern8_exit_cnt = %d\n", - ktime_to_us(hba->ufs_stats.last_hibern8_exit_tstamp), - hba->ufs_stats.hibern8_exit_cnt); ufshcd_print_err_hist(hba, &hba->ufs_stats.pa_err, "pa_err"); ufshcd_print_err_hist(hba, &hba->ufs_stats.dl_err, "dl_err"); @@ -438,8 +429,6 @@ static void ufshcd_print_host_regs(struct ufs_hba *hba) ufshcd_print_err_hist(hba, &hba->ufs_stats.host_reset, "host_reset"); ufshcd_print_err_hist(hba, &hba->ufs_stats.task_abort, "task_abort"); - ufshcd_print_clk_freqs(hba); - ufshcd_vops_dbg_register_dump(hba); } @@ -499,6 +488,8 @@ static void ufshcd_print_tmrs(struct ufs_hba *hba, unsigned long bitmap) static void ufshcd_print_host_state(struct ufs_hba *hba) { + struct scsi_device *sdev_ufs = hba->sdev_ufs_device; + dev_err(hba->dev, "UFS Host state=%d\n", hba->ufshcd_state); dev_err(hba->dev, "outstanding reqs=0x%lx tasks=0x%lx\n", hba->outstanding_reqs, hba->outstanding_tasks); @@ -511,12 +502,24 @@ static void ufshcd_print_host_state(struct ufs_hba *hba) dev_err(hba->dev, "Auto BKOPS=%d, Host self-block=%d\n", hba->auto_bkops_enabled, hba->host->host_self_blocked); dev_err(hba->dev, "Clk gate=%d\n", hba->clk_gating.state); + dev_err(hba->dev, + "last_hibern8_exit_tstamp at %lld us, hibern8_exit_cnt=%d\n", + ktime_to_us(hba->ufs_stats.last_hibern8_exit_tstamp), + hba->ufs_stats.hibern8_exit_cnt); + dev_err(hba->dev, "last intr at %lld us, last intr status=0x%x\n", + ktime_to_us(hba->ufs_stats.last_intr_ts), + hba->ufs_stats.last_intr_status); dev_err(hba->dev, "error handling flags=0x%x, req. abort count=%d\n", hba->eh_flags, hba->req_abort_count); - dev_err(hba->dev, "Host capabilities=0x%x, caps=0x%x\n", - hba->capabilities, hba->caps); + dev_err(hba->dev, "hba->ufs_version=0x%x, Host capabilities=0x%x, caps=0x%x\n", + hba->ufs_version, hba->capabilities, hba->caps); dev_err(hba->dev, "quirks=0x%x, dev. quirks=0x%x\n", hba->quirks, hba->dev_quirks); + if (sdev_ufs) + dev_err(hba->dev, "UFS dev info: %.8s %.16s rev %.4s\n", + sdev_ufs->vendor, sdev_ufs->model, sdev_ufs->rev); + + ufshcd_print_clk_freqs(hba); } /** @@ -5951,6 +5954,8 @@ static irqreturn_t ufshcd_intr(int irq, void *__hba) spin_lock(hba->host->host_lock); intr_status = ufshcd_readl(hba, REG_INTERRUPT_STATUS); + hba->ufs_stats.last_intr_status = intr_status; + hba->ufs_stats.last_intr_ts = ktime_get(); /* * There could be max of hba->nutrs reqs in flight and in worst case diff --git a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h index b2ef18f..b7f54af 100644 --- a/drivers/scsi/ufs/ufshcd.h +++ b/drivers/scsi/ufs/ufshcd.h @@ -409,6 +409,8 @@ struct ufs_err_reg_hist { /** * struct ufs_stats - keeps usage/err statistics + * @last_intr_status: record the last interrupt status. + * @last_intr_ts: record the last interrupt timestamp. * @hibern8_exit_cnt: Counter to keep track of number of exits, * reset this after link-startup. * @last_hibern8_exit_tstamp: Set time after the hibern8 exit. @@ -428,6 +430,9 @@ struct ufs_err_reg_hist { * @tsk_abort: tracks task abort events */ struct ufs_stats { + u32 last_intr_status; + ktime_t last_intr_ts; + u32 hibern8_exit_cnt; ktime_t last_hibern8_exit_tstamp; From patchwork Thu Aug 6 05:06:16 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Can Guo X-Patchwork-Id: 257992 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=-13.0 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED, USER_AGENT_GIT autolearn=unavailable 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 20CDFC43446 for ; Thu, 6 Aug 2020 11:01:01 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 0B5DB22DA7 for ; Thu, 6 Aug 2020 11:01:00 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728072AbgHFFGt (ORCPT ); Thu, 6 Aug 2020 01:06:49 -0400 Received: from labrats.qualcomm.com ([199.106.110.90]:19876 "EHLO labrats.qualcomm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725783AbgHFFGr (ORCPT ); Thu, 6 Aug 2020 01:06:47 -0400 IronPort-SDR: 7/jn5MIrlyMnden2tmcasisn9rj7aKCyXCudorQnFSPrd2mtEeWDtNChucuisYrnyy2jrCKQqy ywrfA13hEKroh6Ps0r95zGUsxALgsNHIvcnmyN2SD38prf6DpZk56qlCKM/pbVTQazqazZakdp 79L7AysRWW6PIOi/pnaTwG84d0ZNEuXY7vYoc2Pwf141GzpwCKq9QiSWow7BMQ+jogq0qQjvEd kAzrkTHMJ20TjDx2lJIe8hIT+ckp5tKAPPGbkG1pqK12rixB/O9FCmFk2itTZYKWAIeyTfusB3 OwQ= X-IronPort-AV: E=Sophos;i="5.75,440,1589266800"; d="scan'208";a="47243584" Received: from unknown (HELO ironmsg03-sd.qualcomm.com) ([10.53.140.143]) by labrats.qualcomm.com with ESMTP; 05 Aug 2020 22:06:45 -0700 Received: from stor-presley.qualcomm.com ([192.168.140.85]) by ironmsg03-sd.qualcomm.com with ESMTP; 05 Aug 2020 22:06:44 -0700 Received: by stor-presley.qualcomm.com (Postfix, from userid 359480) id BAD9F21562; Wed, 5 Aug 2020 22:06:44 -0700 (PDT) From: Can Guo To: asutoshd@codeaurora.org, nguyenb@codeaurora.org, hongwus@codeaurora.org, rnayak@codeaurora.org, 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 , Tomas Winkler , Nitin Rawat , Bart Van Assche , Satya Tangirala , linux-kernel@vger.kernel.org (open list) Subject: [PATCH 5/9] scsi: ufs: Fix concurrency of error handler and other error recovery paths Date: Wed, 5 Aug 2020 22:06:16 -0700 Message-Id: <1596690383-16438-6-git-send-email-cang@codeaurora.org> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1596690383-16438-1-git-send-email-cang@codeaurora.org> References: <1596690383-16438-1-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 Error recovery can be invoked from multiple paths, including hibern8 enter/exit (from ufshcd_link_recovery), ufshcd_eh_host_reset_handler and eh_work scheduled from IRQ context. Ultimately, these paths are trying to invoke ufshcd_reset_and_restore, in either sync or async manner. Having both sync and async manners at the same time has some problems - If link recovery happens during ungate work, ufshcd_hold() would be called recursively. Although commit 53c12d0ef6fcb ("scsi: ufs: fix error recovery after the hibern8 exit failure") [1] fixed a deadlock due to recursive calls of ufshcd_hold() by adding a check of eh_in_progress into ufshcd_hold, this check allows eh_work to run in parallel while link recovery is running. - Similar concurrency can also happen when error recovery is invoked from ufshcd_eh_host_reset_handler and ufshcd_link_recovery. - Concurrency can even happen between eh_works. eh_work, currently queued on system_wq, is allowed to have multiple instances running in parallel, but we don't have proper protection for that. If any of above concurrency happens, error recovery would fail and lead ufs device and host into bad states. To fix the concurrency problem, this change queues eh_work on a single threaded workqueue and remove link recovery calls from hibern8 enter/exit path. Meanwhile, make use of eh_work in eh_host_reset_handler instead of calling ufshcd_reset_and_restore. This unifies UFS error recovery mechanism. In addition, according to the UFSHCI JEDEC spec, hibern8 enter/exit error occurs when the link is broken. This essentially applies to any power mode change operations (since they all use PACP_PWR cmds in UniPro layer). So, in this change, if a power mode change operation (including AH8 enter/exit) fails, mark link state as UIC_LINK_BROKEN_STATE and schedule the eh_work. In this case, error handler needs to do a full reset and restore to recover the link back to active. Before the link state is recovered to active, ufshcd_uic_pwr_ctrl simply returns -ENOLINK to avoid more errors. Signed-off-by: Can Guo Reviewed-by: Bean Huo diff --git a/drivers/scsi/ufs/ufs-sysfs.c b/drivers/scsi/ufs/ufs-sysfs.c index 2d71d23..02d379f00 100644 --- a/drivers/scsi/ufs/ufs-sysfs.c +++ b/drivers/scsi/ufs/ufs-sysfs.c @@ -16,6 +16,7 @@ static const char *ufschd_uic_link_state_to_string( case UIC_LINK_OFF_STATE: return "OFF"; case UIC_LINK_ACTIVE_STATE: return "ACTIVE"; case UIC_LINK_HIBERN8_STATE: return "HIBERN8"; + case UIC_LINK_BROKEN_STATE: return "BROKEN"; default: return "UNKNOWN"; } } diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c index 71c650f..2604016 100644 --- a/drivers/scsi/ufs/ufshcd.c +++ b/drivers/scsi/ufs/ufshcd.c @@ -228,6 +228,7 @@ 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, struct ufs_pa_layer_attr *pwr_mode); +static void ufshcd_schedule_eh_work(struct ufs_hba *hba); 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); @@ -1571,11 +1572,6 @@ int ufshcd_hold(struct ufs_hba *hba, bool async) spin_lock_irqsave(hba->host->host_lock, flags); hba->clk_gating.active_reqs++; - if (ufshcd_eh_in_progress(hba)) { - spin_unlock_irqrestore(hba->host->host_lock, flags); - return 0; - } - start: switch (hba->clk_gating.state) { case CLKS_ON: @@ -1653,6 +1649,7 @@ static void ufshcd_gate_work(struct work_struct *work) struct ufs_hba *hba = container_of(work, struct ufs_hba, clk_gating.gate_work.work); unsigned long flags; + int ret; spin_lock_irqsave(hba->host->host_lock, flags); /* @@ -1679,8 +1676,11 @@ static void ufshcd_gate_work(struct work_struct *work) /* put the link into hibern8 mode before turning off clocks */ if (ufshcd_can_hibern8_during_gating(hba)) { - if (ufshcd_uic_hibern8_enter(hba)) { + ret = ufshcd_uic_hibern8_enter(hba); + if (ret) { hba->clk_gating.state = CLKS_ON; + dev_err(hba->dev, "%s: hibern8 enter failed %d\n", + __func__, ret); trace_ufshcd_clk_gating(dev_name(hba->dev), hba->clk_gating.state); goto out; @@ -1725,11 +1725,10 @@ static void __ufshcd_release(struct ufs_hba *hba) hba->clk_gating.active_reqs--; - if (hba->clk_gating.active_reqs || hba->clk_gating.is_suspended - || hba->ufshcd_state != UFSHCD_STATE_OPERATIONAL - || ufshcd_any_tag_in_use(hba) || hba->outstanding_tasks - || hba->active_uic_cmd || hba->uic_async_done - || ufshcd_eh_in_progress(hba)) + if (hba->clk_gating.active_reqs || hba->clk_gating.is_suspended || + hba->ufshcd_state != UFSHCD_STATE_OPERATIONAL || + ufshcd_any_tag_in_use(hba) || hba->outstanding_tasks || + hba->active_uic_cmd || hba->uic_async_done) return; hba->clk_gating.state = REQ_CLKS_OFF; @@ -3750,6 +3749,10 @@ static int ufshcd_uic_pwr_ctrl(struct ufs_hba *hba, struct uic_command *cmd) ufshcd_add_delay_before_dme_cmd(hba); spin_lock_irqsave(hba->host->host_lock, flags); + if (ufshcd_is_link_broken(hba)) { + ret = -ENOLINK; + goto out_unlock; + } hba->uic_async_done = &uic_async_done; if (ufshcd_readl(hba, REG_INTERRUPT_ENABLE) & UIC_COMMAND_COMPL) { ufshcd_disable_intr(hba, UIC_COMMAND_COMPL); @@ -3797,6 +3800,11 @@ static int ufshcd_uic_pwr_ctrl(struct ufs_hba *hba, struct uic_command *cmd) hba->uic_async_done = NULL; if (reenable_intr) ufshcd_enable_intr(hba, UIC_COMMAND_COMPL); + if (ret) { + ufshcd_set_link_broken(hba); + ufshcd_schedule_eh_work(hba); + } +out_unlock: spin_unlock_irqrestore(hba->host->host_lock, flags); mutex_unlock(&hba->uic_cmd_mutex); @@ -3866,7 +3874,7 @@ int ufshcd_link_recovery(struct ufs_hba *hba) } EXPORT_SYMBOL_GPL(ufshcd_link_recovery); -static int __ufshcd_uic_hibern8_enter(struct ufs_hba *hba) +static int ufshcd_uic_hibern8_enter(struct ufs_hba *hba) { int ret; struct uic_command uic_cmd = {0}; @@ -3879,45 +3887,16 @@ static int __ufshcd_uic_hibern8_enter(struct ufs_hba *hba) trace_ufshcd_profile_hibern8(dev_name(hba->dev), "enter", ktime_to_us(ktime_sub(ktime_get(), start)), ret); - if (ret) { - int err; - + if (ret) dev_err(hba->dev, "%s: hibern8 enter failed. ret = %d\n", __func__, ret); - - /* - * If link recovery fails then return error code returned from - * ufshcd_link_recovery(). - * If link recovery succeeds then return -EAGAIN to attempt - * hibern8 enter retry again. - */ - err = ufshcd_link_recovery(hba); - if (err) { - dev_err(hba->dev, "%s: link recovery failed", __func__); - ret = err; - } else { - ret = -EAGAIN; - } - } else + else ufshcd_vops_hibern8_notify(hba, UIC_CMD_DME_HIBER_ENTER, POST_CHANGE); return ret; } -static int ufshcd_uic_hibern8_enter(struct ufs_hba *hba) -{ - int ret = 0, retries; - - for (retries = UIC_HIBERN8_ENTER_RETRIES; retries > 0; retries--) { - ret = __ufshcd_uic_hibern8_enter(hba); - if (!ret) - goto out; - } -out: - return ret; -} - int ufshcd_uic_hibern8_exit(struct ufs_hba *hba) { struct uic_command uic_cmd = {0}; @@ -3934,7 +3913,6 @@ int ufshcd_uic_hibern8_exit(struct ufs_hba *hba) if (ret) { dev_err(hba->dev, "%s: hibern8 exit failed. ret = %d\n", __func__, ret); - ret = ufshcd_link_recovery(hba); } else { ufshcd_vops_hibern8_notify(hba, UIC_CMD_DME_HIBER_EXIT, POST_CHANGE); @@ -5557,6 +5535,24 @@ static bool ufshcd_quirk_dl_nac_errors(struct ufs_hba *hba) return err_handling; } +/* host lock must be held before calling this func */ +static inline bool ufshcd_is_saved_err_fatal(struct ufs_hba *hba) +{ + return (hba->saved_uic_err & UFSHCD_UIC_DL_PA_INIT_ERROR) || + (hba->saved_err & (INT_FATAL_ERRORS | UFSHCD_UIC_HIBERN8_MASK)); +} + +/* host lock must be held before calling this func */ +static inline void ufshcd_schedule_eh_work(struct ufs_hba *hba) +{ + /* handle fatal errors only when link is not in error state */ + if (hba->ufshcd_state != UFSHCD_STATE_ERROR) { + hba->ufshcd_state = UFSHCD_STATE_EH_SCHEDULED; + if (queue_work(hba->eh_wq, &hba->eh_work)) + ufshcd_scsi_block_requests(hba); + } +} + /** * ufshcd_err_handler - handle UFS errors that require s/w attention * @work: pointer to work structure @@ -5573,15 +5569,23 @@ static void ufshcd_err_handler(struct work_struct *work) hba = container_of(work, struct ufs_hba, eh_work); + spin_lock_irqsave(hba->host->host_lock, flags); + if (hba->ufshcd_state == UFSHCD_STATE_ERROR || + (!(hba->saved_err || hba->saved_uic_err || hba->force_reset || + ufshcd_is_link_broken(hba)))) { + if (hba->ufshcd_state != UFSHCD_STATE_ERROR) + hba->ufshcd_state = UFSHCD_STATE_OPERATIONAL; + spin_unlock_irqrestore(hba->host->host_lock, flags); + ufshcd_scsi_unblock_requests(hba); + return; + } + ufshcd_set_eh_in_progress(hba); + spin_unlock_irqrestore(hba->host->host_lock, flags); pm_runtime_get_sync(hba->dev); ufshcd_hold(hba, false); spin_lock_irqsave(hba->host->host_lock, flags); - if (hba->ufshcd_state == UFSHCD_STATE_RESET) - goto out; - hba->ufshcd_state = UFSHCD_STATE_RESET; - ufshcd_set_eh_in_progress(hba); /* Complete requests that have door-bell cleared by h/w */ ufshcd_complete_requests(hba); @@ -5593,15 +5597,15 @@ static void ufshcd_err_handler(struct work_struct *work) /* release the lock as ufshcd_quirk_dl_nac_errors() may sleep */ ret = ufshcd_quirk_dl_nac_errors(hba); spin_lock_irqsave(hba->host->host_lock, flags); - if (!ret) + if (!ret && !hba->force_reset && ufshcd_is_link_active(hba)) goto skip_err_handling; } - if ((hba->saved_err & INT_FATAL_ERRORS) || - (hba->saved_err & UFSHCD_UIC_HIBERN8_MASK) || + + if (hba->force_reset || ufshcd_is_link_broken(hba) || + ufshcd_is_saved_err_fatal(hba) || ((hba->saved_err & UIC_ERROR) && - (hba->saved_uic_err & (UFSHCD_UIC_DL_PA_INIT_ERROR | - UFSHCD_UIC_DL_NAC_RECEIVED_ERROR | - UFSHCD_UIC_DL_TCx_REPLAY_ERROR)))) + (hba->saved_uic_err & (UFSHCD_UIC_DL_NAC_RECEIVED_ERROR | + UFSHCD_UIC_DL_TCx_REPLAY_ERROR)))) needs_reset = true; /* @@ -5655,34 +5659,25 @@ static void ufshcd_err_handler(struct work_struct *work) __ufshcd_transfer_req_compl(hba, (1UL << (hba->nutrs - 1))); + 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\n", - __func__); - hba->ufshcd_state = UFSHCD_STATE_ERROR; - } - /* - * Inform scsi mid-layer that we did reset and allow to handle - * Unit Attention properly. - */ - scsi_report_bus_reset(hba->host, 0); - hba->saved_err = 0; - hba->saved_uic_err = 0; + if (err) + dev_err(hba->dev, "%s: reset and restore failed with err %d\n", + __func__, err); } skip_err_handling: if (!needs_reset) { - hba->ufshcd_state = UFSHCD_STATE_OPERATIONAL; + if (hba->ufshcd_state == UFSHCD_STATE_RESET) + hba->ufshcd_state = UFSHCD_STATE_OPERATIONAL; if (hba->saved_err || hba->saved_uic_err) dev_err_ratelimited(hba->dev, "%s: exit: saved_err 0x%x saved_uic_err 0x%x", __func__, hba->saved_err, hba->saved_uic_err); } ufshcd_clear_eh_in_progress(hba); - -out: spin_unlock_irqrestore(hba->host->host_lock, flags); ufshcd_scsi_unblock_requests(hba); ufshcd_release(hba); @@ -5816,6 +5811,7 @@ static irqreturn_t ufshcd_check_errors(struct ufs_hba *hba) hba->errors, ufshcd_get_upmcrs(hba)); ufshcd_update_reg_hist(&hba->ufs_stats.auto_hibern8_err, hba->errors); + ufshcd_set_link_broken(hba); queue_eh_work = true; } @@ -5827,30 +5823,22 @@ static irqreturn_t ufshcd_check_errors(struct ufs_hba *hba) hba->saved_err |= hba->errors; hba->saved_uic_err |= hba->uic_error; - /* handle fatal errors only when link is functional */ - if (hba->ufshcd_state == UFSHCD_STATE_OPERATIONAL) { - /* block commands from scsi mid-layer */ - ufshcd_scsi_block_requests(hba); - - hba->ufshcd_state = UFSHCD_STATE_EH_SCHEDULED; + /* dump controller state before resetting */ + if (hba->saved_err & (INT_FATAL_ERRORS | UIC_ERROR)) { + bool pr_prdt = !!(hba->saved_err & + SYSTEM_BUS_FATAL_ERROR); - /* dump controller state before resetting */ - if (hba->saved_err & (INT_FATAL_ERRORS | UIC_ERROR)) { - bool pr_prdt = !!(hba->saved_err & - SYSTEM_BUS_FATAL_ERROR); - - dev_err(hba->dev, "%s: saved_err 0x%x saved_uic_err 0x%x\n", + dev_err(hba->dev, "%s: saved_err 0x%x saved_uic_err 0x%x\n", __func__, hba->saved_err, hba->saved_uic_err); - ufshcd_print_host_regs(hba); - ufshcd_print_pwr_info(hba); - ufshcd_print_tmrs(hba, hba->outstanding_tasks); - ufshcd_print_trs(hba, hba->outstanding_reqs, - pr_prdt); - } - schedule_work(&hba->eh_work); + ufshcd_print_host_regs(hba); + ufshcd_print_pwr_info(hba); + ufshcd_print_tmrs(hba, hba->outstanding_tasks); + ufshcd_print_trs(hba, hba->outstanding_reqs, + pr_prdt); } + ufshcd_schedule_eh_work(hba); retval |= IRQ_HANDLED; } /* @@ -6595,8 +6583,6 @@ static int ufshcd_host_reset_and_restore(struct ufs_hba *hba) /* Establish the link again and restore the device */ err = ufshcd_probe_hba(hba, false); - if (!err && (hba->ufshcd_state != UFSHCD_STATE_OPERATIONAL)) - err = -EIO; out: if (err) dev_err(hba->dev, "%s: Host init failed %d\n", __func__, err); @@ -6615,9 +6601,23 @@ static int ufshcd_host_reset_and_restore(struct ufs_hba *hba) */ static int ufshcd_reset_and_restore(struct ufs_hba *hba) { + u32 saved_err; + u32 saved_uic_err; int err = 0; + unsigned long flags; int retries = MAX_HOST_RESET_RETRIES; + /* + * This is a fresh start, cache and clear saved error first, + * in case new error generated during reset and restore. + */ + spin_lock_irqsave(hba->host->host_lock, flags); + saved_err = hba->saved_err; + saved_uic_err = hba->saved_uic_err; + hba->saved_err = 0; + hba->saved_uic_err = 0; + spin_unlock_irqrestore(hba->host->host_lock, flags); + do { /* Reset the attached device */ ufshcd_vops_device_reset(hba); @@ -6625,6 +6625,18 @@ static int ufshcd_reset_and_restore(struct ufs_hba *hba) err = ufshcd_host_reset_and_restore(hba); } while (err && --retries); + spin_lock_irqsave(hba->host->host_lock, flags); + /* + * Inform scsi mid-layer that we did reset and allow to handle + * Unit Attention properly. + */ + scsi_report_bus_reset(hba->host, 0); + if (err) { + hba->saved_err |= saved_err; + hba->saved_uic_err |= saved_uic_err; + } + spin_unlock_irqrestore(hba->host->host_lock, flags); + return err; } @@ -6636,48 +6648,25 @@ static int ufshcd_reset_and_restore(struct ufs_hba *hba) */ static int ufshcd_eh_host_reset_handler(struct scsi_cmnd *cmd) { - int err; + int err = SUCCESS; unsigned long flags; struct ufs_hba *hba; hba = shost_priv(cmd->device->host); - ufshcd_hold(hba, false); - /* - * Check if there is any race with fatal error handling. - * If so, wait for it to complete. Even though fatal error - * handling does reset and restore in some cases, don't assume - * anything out of it. We are just avoiding race here. - */ - do { - spin_lock_irqsave(hba->host->host_lock, flags); - if (!(work_pending(&hba->eh_work) || - hba->ufshcd_state == UFSHCD_STATE_RESET || - hba->ufshcd_state == UFSHCD_STATE_EH_SCHEDULED)) - break; - spin_unlock_irqrestore(hba->host->host_lock, flags); - dev_dbg(hba->dev, "%s: reset in progress\n", __func__); - flush_work(&hba->eh_work); - } while (1); - - hba->ufshcd_state = UFSHCD_STATE_RESET; - ufshcd_set_eh_in_progress(hba); + spin_lock_irqsave(hba->host->host_lock, flags); + hba->force_reset = true; + ufshcd_schedule_eh_work(hba); + dev_err(hba->dev, "%s: reset in progress - 1\n", __func__); spin_unlock_irqrestore(hba->host->host_lock, flags); - err = ufshcd_reset_and_restore(hba); + flush_work(&hba->eh_work); spin_lock_irqsave(hba->host->host_lock, flags); - if (!err) { - err = SUCCESS; - hba->ufshcd_state = UFSHCD_STATE_OPERATIONAL; - } else { + if (hba->ufshcd_state == UFSHCD_STATE_ERROR) err = FAILED; - hba->ufshcd_state = UFSHCD_STATE_ERROR; - } - ufshcd_clear_eh_in_progress(hba); spin_unlock_irqrestore(hba->host->host_lock, flags); - ufshcd_release(hba); return err; } @@ -7398,6 +7387,7 @@ static int ufshcd_add_lus(struct ufs_hba *hba) static int ufshcd_probe_hba(struct ufs_hba *hba, bool async) { int ret; + unsigned long flags; ktime_t start = ktime_get(); ret = ufshcd_link_startup(hba); @@ -7462,14 +7452,17 @@ static int ufshcd_probe_hba(struct ufs_hba *hba, bool async) */ ufshcd_set_active_icc_lvl(hba); - /* set the state as operational after switching to desired gear */ - hba->ufshcd_state = UFSHCD_STATE_OPERATIONAL; - ufshcd_wb_config(hba); /* Enable Auto-Hibernate if configured */ ufshcd_auto_hibern8_enable(hba); out: + spin_lock_irqsave(hba->host->host_lock, flags); + if (ret) + hba->ufshcd_state = UFSHCD_STATE_ERROR; + else if (hba->ufshcd_state == UFSHCD_STATE_RESET) + hba->ufshcd_state = UFSHCD_STATE_OPERATIONAL; + spin_unlock_irqrestore(hba->host->host_lock, flags); trace_ufshcd_init(dev_name(hba->dev), ret, ktime_to_us(ktime_sub(ktime_get(), start)), @@ -8076,10 +8069,13 @@ static int ufshcd_link_state_transition(struct ufs_hba *hba, if (req_link_state == UIC_LINK_HIBERN8_STATE) { ret = ufshcd_uic_hibern8_enter(hba); - if (!ret) + if (!ret) { ufshcd_set_link_hibern8(hba); - else + } else { + dev_err(hba->dev, "%s: hibern8 enter failed %d\n", + __func__, ret); goto out; + } } /* * If autobkops is enabled, link can't be turned off because @@ -8095,8 +8091,11 @@ static int ufshcd_link_state_transition(struct ufs_hba *hba, * unipro. But putting the link in hibern8 is much faster. */ ret = ufshcd_uic_hibern8_enter(hba); - if (ret) + if (ret) { + dev_err(hba->dev, "%s: hibern8 enter failed %d\n", + __func__, ret); goto out; + } /* * Change controller state to "reset state" which * should also put the link in off/reset state @@ -8416,10 +8415,13 @@ static int ufshcd_resume(struct ufs_hba *hba, enum ufs_pm_op pm_op) if (ufshcd_is_link_hibern8(hba)) { ret = ufshcd_uic_hibern8_exit(hba); - if (!ret) + if (!ret) { ufshcd_set_link_active(hba); - else + } else { + dev_err(hba->dev, "%s: hibern8 exit failed %d\n", + __func__, ret); goto vendor_suspend; + } } else if (ufshcd_is_link_off(hba)) { /* * A full initialization of the host and the device is @@ -8793,6 +8795,7 @@ int ufshcd_init(struct ufs_hba *hba, void __iomem *mmio_base, unsigned int irq) int err; struct Scsi_Host *host = hba->host; struct device *dev = hba->dev; + char eh_wq_name[sizeof("ufs_eh_wq_00")]; if (!mmio_base) { dev_err(hba->dev, @@ -8854,6 +8857,15 @@ int ufshcd_init(struct ufs_hba *hba, void __iomem *mmio_base, unsigned int irq) hba->max_pwr_info.is_valid = false; /* Initialize work queues */ + snprintf(eh_wq_name, sizeof(eh_wq_name), "ufs_eh_wq_%d", + hba->host->host_no); + hba->eh_wq = create_singlethread_workqueue(eh_wq_name); + if (!hba->eh_wq) { + dev_err(hba->dev, "%s: failed to create eh workqueue\n", + __func__); + err = -ENOMEM; + goto out_disable; + } INIT_WORK(&hba->eh_work, ufshcd_err_handler); INIT_WORK(&hba->eeh_work, ufshcd_exception_event_handler); diff --git a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h index b7f54af..618b253 100644 --- a/drivers/scsi/ufs/ufshcd.h +++ b/drivers/scsi/ufs/ufshcd.h @@ -90,6 +90,7 @@ enum uic_link_state { UIC_LINK_OFF_STATE = 0, /* Link powered down or disabled */ UIC_LINK_ACTIVE_STATE = 1, /* Link is in Fast/Slow/Sleep state */ UIC_LINK_HIBERN8_STATE = 2, /* Link is in Hibernate state */ + UIC_LINK_BROKEN_STATE = 3, /* Link is in broken state */ }; #define ufshcd_is_link_off(hba) ((hba)->uic_link_state == UIC_LINK_OFF_STATE) @@ -97,11 +98,15 @@ enum uic_link_state { UIC_LINK_ACTIVE_STATE) #define ufshcd_is_link_hibern8(hba) ((hba)->uic_link_state == \ UIC_LINK_HIBERN8_STATE) +#define ufshcd_is_link_broken(hba) ((hba)->uic_link_state == \ + UIC_LINK_BROKEN_STATE) #define ufshcd_set_link_off(hba) ((hba)->uic_link_state = UIC_LINK_OFF_STATE) #define ufshcd_set_link_active(hba) ((hba)->uic_link_state = \ UIC_LINK_ACTIVE_STATE) #define ufshcd_set_link_hibern8(hba) ((hba)->uic_link_state = \ UIC_LINK_HIBERN8_STATE) +#define ufshcd_set_link_broken(hba) ((hba)->uic_link_state = \ + UIC_LINK_BROKEN_STATE) #define ufshcd_set_ufs_dev_active(h) \ ((h)->curr_dev_pwr_mode = UFS_ACTIVE_PWR_MODE) @@ -616,12 +621,14 @@ struct ufs_hba_variant_params { * @intr_mask: Interrupt Mask Bits * @ee_ctrl_mask: Exception event control mask * @is_powered: flag to check if HBA is powered + * @eh_wq: Workqueue that eh_work works on * @eh_work: Worker to handle UFS errors that require s/w attention * @eeh_work: Worker to handle exception events * @errors: HBA errors * @uic_error: UFS interconnect layer error status * @saved_err: sticky error mask * @saved_uic_err: sticky UIC error mask + * @force_reset: flag to force eh_work perform a full reset * @silence_err_logs: flag to silence error logs * @dev_cmd: ufs device management command information * @last_dme_cmd_tstamp: time stamp of the last completed DME command @@ -710,6 +717,7 @@ struct ufs_hba { bool is_powered; /* Work Queues */ + struct workqueue_struct *eh_wq; struct work_struct eh_work; struct work_struct eeh_work; @@ -719,6 +727,7 @@ struct ufs_hba { u32 saved_err; u32 saved_uic_err; struct ufs_stats ufs_stats; + bool force_reset; bool silence_err_logs; /* Device management request data */ From patchwork Thu Aug 6 05:06:17 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Can Guo X-Patchwork-Id: 257990 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=-13.0 required=3.0 tests=BAYES_00, 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 3FEFAC4345B for ; Thu, 6 Aug 2020 11:01:01 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 235FC23103 for ; 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05 Aug 2020 22:06:48 -0700 Received: by stor-presley.qualcomm.com (Postfix, from userid 359480) id 66AD021562; Wed, 5 Aug 2020 22:06:48 -0700 (PDT) From: Can Guo To: asutoshd@codeaurora.org, nguyenb@codeaurora.org, hongwus@codeaurora.org, rnayak@codeaurora.org, 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 , linux-kernel@vger.kernel.org (open list) Subject: [PATCH 6/9] scsi: ufs: Recover hba runtime PM error in error handler Date: Wed, 5 Aug 2020 22:06:17 -0700 Message-Id: <1596690383-16438-7-git-send-email-cang@codeaurora.org> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1596690383-16438-1-git-send-email-cang@codeaurora.org> References: <1596690383-16438-1-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. Signed-off-by: Can Guo Reviewed-by: Bean Huo diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c index 2604016..6a10003 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 +5558,84 @@ 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_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_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_hold(hba, false); + if (!ufshcd_is_clkgating_allowed(hba)) + ufshcd_setup_clocks(hba, true); + ufshcd_release(hba); + ufshcd_vops_resume(hba, UFS_RUNTIME_PM); + } else { + ufshcd_hold(hba, false); + if (hba->clk_scaling.is_allowed) { + 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) +{ + ufshcd_release(hba); + if (hba->clk_scaling.is_allowed) + ufshcd_resume_clkscaling(hba); + pm_runtime_put(hba->dev); +} + +static inline bool ufshcd_err_handling_should_stop(struct ufs_hba *hba) +{ + return (hba->ufshcd_state == UFSHCD_STATE_ERROR || + (!(hba->saved_err || hba->saved_uic_err || hba->force_reset || + ufshcd_is_link_broken(hba)))); +} + +#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 @@ -5570,9 +5653,7 @@ static void ufshcd_err_handler(struct work_struct *work) hba = container_of(work, struct ufs_hba, eh_work); spin_lock_irqsave(hba->host->host_lock, flags); - if (hba->ufshcd_state == UFSHCD_STATE_ERROR || - (!(hba->saved_err || hba->saved_uic_err || hba->force_reset || - ufshcd_is_link_broken(hba)))) { + if (ufshcd_err_handling_should_stop(hba)) { if (hba->ufshcd_state != UFSHCD_STATE_ERROR) hba->ufshcd_state = UFSHCD_STATE_OPERATIONAL; spin_unlock_irqrestore(hba->host->host_lock, flags); @@ -5581,10 +5662,17 @@ 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); + /* + * A full reset and restore might have happened after preparation + * is finished, double check whether we should stop. + */ + if (ufshcd_err_handling_should_stop(hba)) { + if (hba->ufshcd_state != UFSHCD_STATE_ERROR) + hba->ufshcd_state = UFSHCD_STATE_OPERATIONAL; + goto out; + } hba->ufshcd_state = UFSHCD_STATE_RESET; /* Complete requests that have door-bell cleared by h/w */ @@ -5662,10 +5750,12 @@ 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: @@ -5677,11 +5767,11 @@ static void ufshcd_err_handler(struct work_struct *work) __func__, hba->saved_err, hba->saved_uic_err); } +out: 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); } /**