From patchwork Wed Dec 30 11:29:34 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Can Guo X-Patchwork-Id: 11993161 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=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,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 750EAC433DB for ; Wed, 30 Dec 2020 11:30:37 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 3F78F2226A for ; Wed, 30 Dec 2020 11:30:37 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726322AbgL3La1 (ORCPT ); Wed, 30 Dec 2020 06:30:27 -0500 Received: from labrats.qualcomm.com ([199.106.110.90]:2474 "EHLO labrats.qualcomm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726161AbgL3La1 (ORCPT ); Wed, 30 Dec 2020 06:30:27 -0500 IronPort-SDR: 3W0kOHYV+PWP1pIpSjdTqeWSEfut0OUNBOdUoQ3K18wUkMk/Nrseo2A+Lr7DEBwq4q7SPly23h zjDEnBPqcugX0rEQL9AqeU7VlSRj2i7Oo5Gj/m5inpJYFLW3dM2AIyPIVuMYvDaB6WuiW332RT sR1WxzDtOTp8J6MHEw7Fc7lPo11cl2aZ8l5KqFeKjPGHsO8f7qQg7ism+oEz2pJE2HatD6bD32 im7CBjy0Q2VoKeSgYaE0f0HeqaKLz99KEKC78FdfnGSD3D3xrWstA1XVCjTGhN8J3ApDy/8abg cJE= X-IronPort-AV: E=Sophos;i="5.78,461,1599548400"; d="scan'208";a="47629544" Received: from unknown (HELO ironmsg-SD-alpha.qualcomm.com) ([10.53.140.30]) by labrats.qualcomm.com with ESMTP; 30 Dec 2020 03:29:46 -0800 X-QCInternal: smtphost Received: from stor-presley.qualcomm.com ([192.168.140.85]) by ironmsg-SD-alpha.qualcomm.com with ESMTP; 30 Dec 2020 03:29:45 -0800 Received: by stor-presley.qualcomm.com (Postfix, from userid 359480) id 3D18D21868; Wed, 30 Dec 2020 03:29:45 -0800 (PST) From: Can Guo To: asutoshd@codeaurora.org, nguyenb@codeaurora.org, hongwus@codeaurora.org, ziqichen@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 , Satya Tangirala , linux-kernel@vger.kernel.org (open list) Subject: [PATCH v8 1/3] scsi: ufs: Protect some contexts from unexpected clock scaling Date: Wed, 30 Dec 2020 03:29:34 -0800 Message-Id: <1609327777-20520-2-git-send-email-cang@codeaurora.org> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1609327777-20520-1-git-send-email-cang@codeaurora.org> References: <1609327777-20520-1-git-send-email-cang@codeaurora.org> Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org In contexts like suspend, shutdown and error handling, we need to suspend devfreq to make sure these contexts won't be disturbed by clock scaling. However, suspending devfreq is not enough since users can still trigger a clock scaling by manipulating the devfreq sysfs nodes like min/max_freq and governor even after devfreq is suspended. Moreover, mere suspending devfreq cannot synchroinze a clock scaling which has already been invoked through these sysfs nodes. Add one more flag in struct clk_scaling and wrap the entire func ufshcd_devfreq_scale() with the clk_scaling_lock, so that we can use this flag and clk_scaling_lock to control and synchronize clock scaling invoked through devfreq sysfs nodes. Signed-off-by: Can Guo --- drivers/scsi/ufs/ufshcd.c | 87 ++++++++++++++++++++++++++++++----------------- drivers/scsi/ufs/ufshcd.h | 6 +++- 2 files changed, 60 insertions(+), 33 deletions(-) diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c index 0c148fc..44cbee1 100644 --- a/drivers/scsi/ufs/ufshcd.c +++ b/drivers/scsi/ufs/ufshcd.c @@ -1147,19 +1147,33 @@ static int ufshcd_clock_scaling_prepare(struct ufs_hba *hba) */ ufshcd_scsi_block_requests(hba); down_write(&hba->clk_scaling_lock); - if (ufshcd_wait_for_doorbell_clr(hba, DOORBELL_CLR_TOUT_US)) { + + if (!hba->clk_scaling.is_allowed) + ret = -EAGAIN; + else if (ufshcd_wait_for_doorbell_clr(hba, DOORBELL_CLR_TOUT_US)) ret = -EBUSY; + + if (ret) { up_write(&hba->clk_scaling_lock); ufshcd_scsi_unblock_requests(hba); + goto out; } + /* let's not get into low power until clock scaling is completed */ + ufshcd_hold(hba, false); + +out: return ret; } -static void ufshcd_clock_scaling_unprepare(struct ufs_hba *hba) +static void ufshcd_clock_scaling_unprepare(struct ufs_hba *hba, bool writelock) { - up_write(&hba->clk_scaling_lock); + if (writelock) + up_write(&hba->clk_scaling_lock); + else + up_read(&hba->clk_scaling_lock); ufshcd_scsi_unblock_requests(hba); + ufshcd_release(hba); } /** @@ -1174,13 +1188,11 @@ static void ufshcd_clock_scaling_unprepare(struct ufs_hba *hba) static int ufshcd_devfreq_scale(struct ufs_hba *hba, bool scale_up) { int ret = 0; - - /* let's not get into low power until clock scaling is completed */ - ufshcd_hold(hba, false); + bool is_writelock = true; ret = ufshcd_clock_scaling_prepare(hba); if (ret) - goto out; + return ret; /* scale down the gear before scaling down clocks */ if (!scale_up) { @@ -1206,14 +1218,12 @@ static int ufshcd_devfreq_scale(struct ufs_hba *hba, bool scale_up) } /* Enable Write Booster if we have scaled up else disable it */ - up_write(&hba->clk_scaling_lock); + downgrade_write(&hba->clk_scaling_lock); + is_writelock = false; ufshcd_wb_ctrl(hba, scale_up); - down_write(&hba->clk_scaling_lock); out_unprepare: - ufshcd_clock_scaling_unprepare(hba); -out: - ufshcd_release(hba); + ufshcd_clock_scaling_unprepare(hba, is_writelock); return ret; } @@ -1487,7 +1497,7 @@ static ssize_t ufshcd_clkscale_enable_show(struct device *dev, { struct ufs_hba *hba = dev_get_drvdata(dev); - return snprintf(buf, PAGE_SIZE, "%d\n", hba->clk_scaling.is_allowed); + return snprintf(buf, PAGE_SIZE, "%d\n", hba->clk_scaling.is_enabled); } static ssize_t ufshcd_clkscale_enable_store(struct device *dev, @@ -1501,7 +1511,7 @@ static ssize_t ufshcd_clkscale_enable_store(struct device *dev, return -EINVAL; value = !!value; - if (value == hba->clk_scaling.is_allowed) + if (value == hba->clk_scaling.is_enabled) goto out; pm_runtime_get_sync(hba->dev); @@ -1510,7 +1520,7 @@ static ssize_t ufshcd_clkscale_enable_store(struct device *dev, cancel_work_sync(&hba->clk_scaling.suspend_work); cancel_work_sync(&hba->clk_scaling.resume_work); - hba->clk_scaling.is_allowed = value; + hba->clk_scaling.is_enabled = value; if (value) { ufshcd_resume_clkscaling(hba); @@ -1845,8 +1855,6 @@ static void ufshcd_init_clk_scaling(struct ufs_hba *hba) snprintf(wq_name, sizeof(wq_name), "ufs_clkscaling_%d", hba->host->host_no); hba->clk_scaling.workq = create_singlethread_workqueue(wq_name); - - ufshcd_clkscaling_init_sysfs(hba); } static void ufshcd_exit_clk_scaling(struct ufs_hba *hba) @@ -1854,6 +1862,8 @@ static void ufshcd_exit_clk_scaling(struct ufs_hba *hba) if (!ufshcd_is_clkscaling_supported(hba)) return; + if (hba->clk_scaling.enable_attr.attr.name) + device_remove_file(hba->dev, &hba->clk_scaling.enable_attr); destroy_workqueue(hba->clk_scaling.workq); ufshcd_devfreq_remove(hba); } @@ -1918,7 +1928,7 @@ static void ufshcd_clk_scaling_start_busy(struct ufs_hba *hba) if (!hba->clk_scaling.active_reqs++) queue_resume_work = true; - if (!hba->clk_scaling.is_allowed || hba->pm_op_in_progress) + if (!hba->clk_scaling.is_enabled || hba->pm_op_in_progress) return; if (queue_resume_work) @@ -4987,7 +4997,8 @@ static void __ufshcd_transfer_req_compl(struct ufs_hba *hba, complete(hba->dev_cmd.complete); } } - if (ufshcd_is_clkscaling_supported(hba)) + if (ufshcd_is_clkscaling_supported(hba) && + hba->clk_scaling.active_reqs > 0) hba->clk_scaling.active_reqs--; } @@ -5650,18 +5661,25 @@ static void ufshcd_err_handling_prepare(struct ufs_hba *hba) ufshcd_vops_resume(hba, UFS_RUNTIME_PM); } else { ufshcd_hold(hba, false); - if (hba->clk_scaling.is_allowed) { + if (hba->clk_scaling.is_enabled) { cancel_work_sync(&hba->clk_scaling.suspend_work); cancel_work_sync(&hba->clk_scaling.resume_work); ufshcd_suspend_clkscaling(hba); } } + down_write(&hba->clk_scaling_lock); + hba->clk_scaling.is_allowed = false; + up_write(&hba->clk_scaling_lock); } static void ufshcd_err_handling_unprepare(struct ufs_hba *hba) { ufshcd_release(hba); - if (hba->clk_scaling.is_allowed) + + down_write(&hba->clk_scaling_lock); + hba->clk_scaling.is_allowed = true; + up_write(&hba->clk_scaling_lock); + if (hba->clk_scaling.is_enabled) ufshcd_resume_clkscaling(hba); pm_runtime_put(hba->dev); } @@ -7620,12 +7638,14 @@ static int ufshcd_add_lus(struct ufs_hba *hba) sizeof(struct ufs_pa_layer_attr)); hba->clk_scaling.saved_pwr_info.is_valid = true; if (!hba->devfreq) { + hba->clk_scaling.is_allowed = true; ret = ufshcd_devfreq_init(hba); if (ret) goto out; - } - hba->clk_scaling.is_allowed = true; + hba->clk_scaling.is_enabled = true; + ufshcd_clkscaling_init_sysfs(hba); + } } ufs_bsg_probe(hba); @@ -8491,11 +8511,14 @@ static int ufshcd_suspend(struct ufs_hba *hba, enum ufs_pm_op pm_op) ufshcd_hold(hba, false); hba->clk_gating.is_suspended = true; - if (hba->clk_scaling.is_allowed) { + if (hba->clk_scaling.is_enabled) { cancel_work_sync(&hba->clk_scaling.suspend_work); cancel_work_sync(&hba->clk_scaling.resume_work); ufshcd_suspend_clkscaling(hba); } + down_write(&hba->clk_scaling_lock); + hba->clk_scaling.is_allowed = false; + up_write(&hba->clk_scaling_lock); if (req_dev_pwr_mode == UFS_ACTIVE_PWR_MODE && req_link_state == UIC_LINK_ACTIVE_STATE) { @@ -8592,8 +8615,6 @@ static int ufshcd_suspend(struct ufs_hba *hba, enum ufs_pm_op pm_op) goto out; set_link_active: - if (hba->clk_scaling.is_allowed) - ufshcd_resume_clkscaling(hba); ufshcd_vreg_set_hpm(hba); if (ufshcd_is_link_hibern8(hba) && !ufshcd_uic_hibern8_exit(hba)) ufshcd_set_link_active(hba); @@ -8603,7 +8624,10 @@ static int ufshcd_suspend(struct ufs_hba *hba, enum ufs_pm_op pm_op) if (!ufshcd_set_dev_pwr_mode(hba, UFS_ACTIVE_PWR_MODE)) ufshcd_disable_auto_bkops(hba); enable_gating: - if (hba->clk_scaling.is_allowed) + down_write(&hba->clk_scaling_lock); + hba->clk_scaling.is_allowed = true; + up_write(&hba->clk_scaling_lock); + if (hba->clk_scaling.is_enabled) ufshcd_resume_clkscaling(hba); hba->clk_gating.is_suspended = false; hba->dev_info.b_rpm_dev_flush_capable = false; @@ -8701,7 +8725,10 @@ static int ufshcd_resume(struct ufs_hba *hba, enum ufs_pm_op pm_op) hba->clk_gating.is_suspended = false; - if (hba->clk_scaling.is_allowed) + down_write(&hba->clk_scaling_lock); + hba->clk_scaling.is_allowed = true; + up_write(&hba->clk_scaling_lock); + if (hba->clk_scaling.is_enabled) ufshcd_resume_clkscaling(hba); /* Enable Auto-Hibernate if configured */ @@ -8725,8 +8752,6 @@ static int ufshcd_resume(struct ufs_hba *hba, enum ufs_pm_op pm_op) ufshcd_vreg_set_lpm(hba); disable_irq_and_vops_clks: ufshcd_disable_irq(hba); - if (hba->clk_scaling.is_allowed) - ufshcd_suspend_clkscaling(hba); ufshcd_setup_clocks(hba, false); if (ufshcd_is_clkgating_allowed(hba)) { hba->clk_gating.state = CLKS_OFF; @@ -8944,8 +8969,6 @@ void ufshcd_remove(struct ufs_hba *hba) ufshcd_exit_clk_scaling(hba); ufshcd_exit_clk_gating(hba); - if (ufshcd_is_clkscaling_supported(hba)) - device_remove_file(hba->dev, &hba->clk_scaling.enable_attr); ufshcd_hba_exit(hba); } EXPORT_SYMBOL_GPL(ufshcd_remove); diff --git a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h index e0f00a4..5737679 100644 --- a/drivers/scsi/ufs/ufshcd.h +++ b/drivers/scsi/ufs/ufshcd.h @@ -382,7 +382,10 @@ struct ufs_saved_pwr_info { * @workq: workqueue to schedule devfreq suspend/resume work * @suspend_work: worker to suspend devfreq * @resume_work: worker to resume devfreq - * @is_allowed: tracks if scaling is currently allowed or not + * @is_enabled: tracks if scaling is currently enabled or not, controlled by + clkscale_enable sysfs node + * @is_allowed: tracks if scaling is currently allowed or not, used to block + clock scaling which is not invoked from devfreq governor * @is_busy_started: tracks if busy period has started or not * @is_suspended: tracks if devfreq is suspended or not */ @@ -396,6 +399,7 @@ struct ufs_clk_scaling { struct workqueue_struct *workq; struct work_struct suspend_work; struct work_struct resume_work; + bool is_enabled; bool is_allowed; bool is_busy_started; bool is_suspended; From patchwork Wed Dec 30 11:29:35 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Can Guo X-Patchwork-Id: 11993165 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=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,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 5CF6EC433E0 for ; Wed, 30 Dec 2020 11:30:53 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 3112D207B1 for ; Wed, 30 Dec 2020 11:30:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726569AbgL3Lao (ORCPT ); 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Wed, 30 Dec 2020 03:29:50 -0800 (PST) From: Can Guo To: asutoshd@codeaurora.org, nguyenb@codeaurora.org, hongwus@codeaurora.org, ziqichen@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 , Satya Tangirala , linux-kernel@vger.kernel.org (open list) Subject: [PATCH v8 2/3] scsi: ufs: Refactor ufshcd_init/exit_clk_scaling/gating() Date: Wed, 30 Dec 2020 03:29:35 -0800 Message-Id: <1609327777-20520-3-git-send-email-cang@codeaurora.org> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1609327777-20520-1-git-send-email-cang@codeaurora.org> References: <1609327777-20520-1-git-send-email-cang@codeaurora.org> Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org ufshcd_hba_exit() is always called after ufshcd_exit_clk_scaling() and ufshcd_exit_clk_gating(), so move ufshcd_exit_clk_scaling/gating() to ufshcd_hba_exit(). Meanwhile, add dedicated funcs to init and remove sysfs nodes of clock scaling/gating to make the code more readable. Overall functionality remains same. Signed-off-by: Can Guo --- drivers/scsi/ufs/ufshcd.c | 128 +++++++++++++++++++++++++--------------------- drivers/scsi/ufs/ufshcd.h | 4 ++ 2 files changed, 75 insertions(+), 57 deletions(-) diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c index 44cbee1..b7840ef 100644 --- a/drivers/scsi/ufs/ufshcd.c +++ b/drivers/scsi/ufs/ufshcd.c @@ -1538,7 +1538,7 @@ static ssize_t ufshcd_clkscale_enable_store(struct device *dev, return count; } -static void ufshcd_clkscaling_init_sysfs(struct ufs_hba *hba) +static void ufshcd_init_clk_scaling_sysfs(struct ufs_hba *hba) { hba->clk_scaling.enable_attr.show = ufshcd_clkscale_enable_show; hba->clk_scaling.enable_attr.store = ufshcd_clkscale_enable_store; @@ -1549,6 +1549,42 @@ static void ufshcd_clkscaling_init_sysfs(struct ufs_hba *hba) dev_err(hba->dev, "Failed to create sysfs for clkscale_enable\n"); } +static void ufshcd_remove_clk_scaling_sysfs(struct ufs_hba *hba) +{ + if (hba->clk_scaling.enable_attr.attr.name) + device_remove_file(hba->dev, &hba->clk_scaling.enable_attr); +} + +static void ufshcd_init_clk_scaling(struct ufs_hba *hba) +{ + char wq_name[sizeof("ufs_clkscaling_00")]; + + if (!ufshcd_is_clkscaling_supported(hba)) + return; + + INIT_WORK(&hba->clk_scaling.suspend_work, + ufshcd_clk_scaling_suspend_work); + INIT_WORK(&hba->clk_scaling.resume_work, + ufshcd_clk_scaling_resume_work); + + snprintf(wq_name, sizeof(wq_name), "ufs_clkscaling_%d", + hba->host->host_no); + hba->clk_scaling.workq = create_singlethread_workqueue(wq_name); + + hba->clk_scaling.is_initialized = true; +} + +static void ufshcd_exit_clk_scaling(struct ufs_hba *hba) +{ + if (!hba->clk_scaling.is_initialized) + return; + + ufshcd_remove_clk_scaling_sysfs(hba); + destroy_workqueue(hba->clk_scaling.workq); + ufshcd_devfreq_remove(hba); + hba->clk_scaling.is_initialized = false; +} + static void ufshcd_ungate_work(struct work_struct *work) { int ret; @@ -1840,32 +1876,31 @@ static ssize_t ufshcd_clkgate_enable_store(struct device *dev, return count; } -static void ufshcd_init_clk_scaling(struct ufs_hba *hba) +static void ufshcd_init_clk_gating_sysfs(struct ufs_hba *hba) { - char wq_name[sizeof("ufs_clkscaling_00")]; - - if (!ufshcd_is_clkscaling_supported(hba)) - return; - - INIT_WORK(&hba->clk_scaling.suspend_work, - ufshcd_clk_scaling_suspend_work); - INIT_WORK(&hba->clk_scaling.resume_work, - ufshcd_clk_scaling_resume_work); + hba->clk_gating.delay_attr.show = ufshcd_clkgate_delay_show; + hba->clk_gating.delay_attr.store = ufshcd_clkgate_delay_store; + sysfs_attr_init(&hba->clk_gating.delay_attr.attr); + hba->clk_gating.delay_attr.attr.name = "clkgate_delay_ms"; + hba->clk_gating.delay_attr.attr.mode = 0644; + if (device_create_file(hba->dev, &hba->clk_gating.delay_attr)) + dev_err(hba->dev, "Failed to create sysfs for clkgate_delay\n"); - snprintf(wq_name, sizeof(wq_name), "ufs_clkscaling_%d", - hba->host->host_no); - hba->clk_scaling.workq = create_singlethread_workqueue(wq_name); + hba->clk_gating.enable_attr.show = ufshcd_clkgate_enable_show; + hba->clk_gating.enable_attr.store = ufshcd_clkgate_enable_store; + sysfs_attr_init(&hba->clk_gating.enable_attr.attr); + hba->clk_gating.enable_attr.attr.name = "clkgate_enable"; + hba->clk_gating.enable_attr.attr.mode = 0644; + if (device_create_file(hba->dev, &hba->clk_gating.enable_attr)) + dev_err(hba->dev, "Failed to create sysfs for clkgate_enable\n"); } -static void ufshcd_exit_clk_scaling(struct ufs_hba *hba) +static void ufshcd_remove_clk_gating_sysfs(struct ufs_hba *hba) { - if (!ufshcd_is_clkscaling_supported(hba)) - return; - - if (hba->clk_scaling.enable_attr.attr.name) - device_remove_file(hba->dev, &hba->clk_scaling.enable_attr); - destroy_workqueue(hba->clk_scaling.workq); - ufshcd_devfreq_remove(hba); + if (hba->clk_gating.delay_attr.attr.name) + device_remove_file(hba->dev, &hba->clk_gating.delay_attr); + if (hba->clk_gating.enable_attr.attr.name) + device_remove_file(hba->dev, &hba->clk_gating.enable_attr); } static void ufshcd_init_clk_gating(struct ufs_hba *hba) @@ -1886,34 +1921,22 @@ static void ufshcd_init_clk_gating(struct ufs_hba *hba) hba->clk_gating.clk_gating_workq = alloc_ordered_workqueue(wq_name, WQ_MEM_RECLAIM); - hba->clk_gating.is_enabled = true; + ufshcd_init_clk_gating_sysfs(hba); - hba->clk_gating.delay_attr.show = ufshcd_clkgate_delay_show; - hba->clk_gating.delay_attr.store = ufshcd_clkgate_delay_store; - sysfs_attr_init(&hba->clk_gating.delay_attr.attr); - hba->clk_gating.delay_attr.attr.name = "clkgate_delay_ms"; - hba->clk_gating.delay_attr.attr.mode = 0644; - if (device_create_file(hba->dev, &hba->clk_gating.delay_attr)) - dev_err(hba->dev, "Failed to create sysfs for clkgate_delay\n"); - - hba->clk_gating.enable_attr.show = ufshcd_clkgate_enable_show; - hba->clk_gating.enable_attr.store = ufshcd_clkgate_enable_store; - sysfs_attr_init(&hba->clk_gating.enable_attr.attr); - hba->clk_gating.enable_attr.attr.name = "clkgate_enable"; - hba->clk_gating.enable_attr.attr.mode = 0644; - if (device_create_file(hba->dev, &hba->clk_gating.enable_attr)) - dev_err(hba->dev, "Failed to create sysfs for clkgate_enable\n"); + hba->clk_gating.is_enabled = true; + hba->clk_gating.is_initialized = true; } static void ufshcd_exit_clk_gating(struct ufs_hba *hba) { - if (!ufshcd_is_clkgating_allowed(hba)) + if (!hba->clk_gating.is_initialized) return; - device_remove_file(hba->dev, &hba->clk_gating.delay_attr); - device_remove_file(hba->dev, &hba->clk_gating.enable_attr); + + ufshcd_remove_clk_gating_sysfs(hba); cancel_work_sync(&hba->clk_gating.ungate_work); cancel_delayed_work_sync(&hba->clk_gating.gate_work); destroy_workqueue(hba->clk_gating.clk_gating_workq); + hba->clk_gating.is_initialized = false; } /* Must be called with host lock acquired */ @@ -7644,7 +7667,7 @@ static int ufshcd_add_lus(struct ufs_hba *hba) goto out; hba->clk_scaling.is_enabled = true; - ufshcd_clkscaling_init_sysfs(hba); + ufshcd_init_clk_scaling_sysfs(hba); } } @@ -7773,7 +7796,6 @@ static void ufshcd_async_scan(void *data, async_cookie_t cookie) */ if (ret) { pm_runtime_put_sync(hba->dev); - ufshcd_exit_clk_scaling(hba); ufshcd_hba_exit(hba); } } @@ -8210,12 +8232,12 @@ static int ufshcd_hba_init(struct ufs_hba *hba) static void ufshcd_hba_exit(struct ufs_hba *hba) { if (hba->is_powered) { + ufshcd_exit_clk_scaling(hba); + ufshcd_exit_clk_gating(hba); + if (hba->eh_wq) + destroy_workqueue(hba->eh_wq); ufshcd_variant_hba_exit(hba); ufshcd_setup_vreg(hba, false); - ufshcd_suspend_clkscaling(hba); - if (ufshcd_is_clkscaling_supported(hba)) - if (hba->devfreq) - ufshcd_suspend_clkscaling(hba); ufshcd_setup_clocks(hba, false); ufshcd_setup_hba_vreg(hba, false); hba->is_powered = false; @@ -8962,13 +8984,9 @@ void ufshcd_remove(struct ufs_hba *hba) blk_mq_free_tag_set(&hba->tmf_tag_set); blk_cleanup_queue(hba->cmd_queue); scsi_remove_host(hba->host); - destroy_workqueue(hba->eh_wq); /* disable interrupts */ ufshcd_disable_intr(hba, hba->intr_mask); ufshcd_hba_stop(hba); - - ufshcd_exit_clk_scaling(hba); - ufshcd_exit_clk_gating(hba); ufshcd_hba_exit(hba); } EXPORT_SYMBOL_GPL(ufshcd_remove); @@ -9167,7 +9185,7 @@ int ufshcd_init(struct ufs_hba *hba, void __iomem *mmio_base, unsigned int irq) err = devm_request_irq(dev, irq, ufshcd_intr, IRQF_SHARED, UFSHCD, hba); if (err) { dev_err(hba->dev, "request irq failed\n"); - goto exit_gating; + goto out_disable; } else { hba->is_irq_enabled = true; } @@ -9175,7 +9193,7 @@ int ufshcd_init(struct ufs_hba *hba, void __iomem *mmio_base, unsigned int irq) err = scsi_add_host(host, hba->dev); if (err) { dev_err(hba->dev, "scsi_add_host failed\n"); - goto exit_gating; + goto out_disable; } hba->cmd_queue = blk_mq_init_queue(&hba->host->tag_set); @@ -9258,10 +9276,6 @@ int ufshcd_init(struct ufs_hba *hba, void __iomem *mmio_base, unsigned int irq) blk_cleanup_queue(hba->cmd_queue); out_remove_scsi_host: scsi_remove_host(hba->host); -exit_gating: - ufshcd_exit_clk_scaling(hba); - ufshcd_exit_clk_gating(hba); - destroy_workqueue(hba->eh_wq); out_disable: hba->is_irq_enabled = false; ufshcd_hba_exit(hba); diff --git a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h index 5737679..cb9075d 100644 --- a/drivers/scsi/ufs/ufshcd.h +++ b/drivers/scsi/ufs/ufshcd.h @@ -347,6 +347,7 @@ enum clk_gating_state { * @delay_attr: sysfs attribute to control delay_attr * @enable_attr: sysfs attribute to enable/disable clock gating * @is_enabled: Indicates the current status of clock gating + * @is_initialized: Indicates whether clock gating is initialized or not * @active_reqs: number of requests that are pending and should be waited for * completion before gating clocks. */ @@ -359,6 +360,7 @@ struct ufs_clk_gating { struct device_attribute delay_attr; struct device_attribute enable_attr; bool is_enabled; + bool is_initialized; int active_reqs; struct workqueue_struct *clk_gating_workq; }; @@ -386,6 +388,7 @@ struct ufs_saved_pwr_info { clkscale_enable sysfs node * @is_allowed: tracks if scaling is currently allowed or not, used to block clock scaling which is not invoked from devfreq governor + * @is_initialized: Indicates whether clock scaling is initialized or not * @is_busy_started: tracks if busy period has started or not * @is_suspended: tracks if devfreq is suspended or not */ @@ -401,6 +404,7 @@ struct ufs_clk_scaling { struct work_struct resume_work; bool is_enabled; bool is_allowed; + bool is_initialized; bool is_busy_started; bool is_suspended; }; From patchwork Wed Dec 30 11:29:36 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Can Guo X-Patchwork-Id: 11993163 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=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,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 45D6CC433E6 for ; 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30 Dec 2020 03:29:56 -0800 X-QCInternal: smtphost Received: from stor-presley.qualcomm.com ([192.168.140.85]) by ironmsg05-sd.qualcomm.com with ESMTP; 30 Dec 2020 03:29:54 -0800 Received: by stor-presley.qualcomm.com (Postfix, from userid 359480) id 4FA7521868; Wed, 30 Dec 2020 03:29:54 -0800 (PST) From: Can Guo To: asutoshd@codeaurora.org, nguyenb@codeaurora.org, hongwus@codeaurora.org, ziqichen@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 , 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 v8 3/3] scsi: ufs: Revert "Make sure clk scaling happens only when HBA is runtime ACTIVE" Date: Wed, 30 Dec 2020 03:29:36 -0800 Message-Id: <1609327777-20520-4-git-send-email-cang@codeaurora.org> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1609327777-20520-1-git-send-email-cang@codeaurora.org> References: <1609327777-20520-1-git-send-email-cang@codeaurora.org> Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org Commit 73cc291c27024 ("Make sure clk scaling happens only when HBA is runtime ACTIVE") is no longer needed since commit f7a42540928a8 ("scsi: ufs: Protect some contexts from unexpected clock scaling") is a more mature fix to protect UFS LLD stability from clock scaling invoked through sysfs nodes by users. Reviewed-by: Stanley Chu Signed-off-by: Can Guo --- drivers/scsi/ufs/ufshcd.c | 7 ------- 1 file changed, 7 deletions(-) diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c index b7840ef..3487c56 100644 --- a/drivers/scsi/ufs/ufshcd.c +++ b/drivers/scsi/ufs/ufshcd.c @@ -1304,15 +1304,8 @@ static int ufshcd_devfreq_target(struct device *dev, } spin_unlock_irqrestore(hba->host->host_lock, irq_flags); - pm_runtime_get_noresume(hba->dev); - if (!pm_runtime_active(hba->dev)) { - pm_runtime_put_noidle(hba->dev); - ret = -EAGAIN; - goto out; - } start = ktime_get(); ret = ufshcd_devfreq_scale(hba, scale_up); - pm_runtime_put(hba->dev); trace_ufshcd_profile_clk_scaling(dev_name(hba->dev), (scale_up ? "up" : "down"),