From patchwork Wed Jan 20 10:04:22 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Can Guo X-Patchwork-Id: 12031849 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=-16.9 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,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 AD3BEC433DB for ; Wed, 20 Jan 2021 10:06:43 +0000 (UTC) Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 4258B22227 for ; Wed, 20 Jan 2021 10:06:43 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 4258B22227 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=codeaurora.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=merlin.20170209; h=Sender:Content-Transfer-Encoding: Content-Type:MIME-Version:Cc:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:References:In-Reply-To:Message-Id:Date:Subject:To: From:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=neT7zJdmjc4h0sKiBlhwg2EBIZJ6Gl3V+T/dJOHl1Hk=; b=OC6r4noBRJJbubNusjZgxsg9vj 3Dw3wh5nkRHIoE3ellHK//6gzvb4LM6eQ4l8CoTUT2czu9Mr3F+9DIrervCgXMazCDJ5b1pslQ+fq Exi/1vF2NHojL3GgeSQH5+9V1fZz7rRKqJ2PeUH72hNbPPbnX7EscaVwTkaunHiGTTBy74L+PTfy8 Ln55gTrNX4jt83z+Vgb6WzbWxi4BBdeIyokfLwre1ZKtq6SLuc4Dj0EnXncXIrH/UiUMDn76a5RQu YP1EW84fCrFe4zyEk2xxo4gPLyrCUQfUFNlcL2CpRLvLMz1nekgPRWoofC9apkUTBuia0+xan9nAM ywtiIMxQ==; Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1l2AMR-0006Er-AR; Wed, 20 Jan 2021 10:05:11 +0000 Received: from labrats.qualcomm.com ([199.106.110.90]) by merlin.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1l2AMN-0006EH-SG; Wed, 20 Jan 2021 10:05:09 +0000 IronPort-SDR: 7z8TTWr1gkm4l9p/9z/7xM4BMhwIyTlxSkFj2I/pal1+mIOAVbTq1IUqMIUVMvCoGcVPlsy8Fg 7vglPaPhk7xRolWdFfgmWCIknC69LwIyTs2iyjvMKcMwuUTN90U3HqiYZYpeF7GLchSRmyYO0X fJtk+GswM2NE6SWCRP5euplBNVkDf/LwZyZB8bzgRyxXk2Pmm0SbhrBiCbY6avU0/gvzatmNSD p+3vk9zPJfujz4TJvLl3+O+6bKxH2AkoxLWlljiJ8P+CymEKCgFZMbSCTq81PHqSvrxM9ynqD+ CpY= X-IronPort-AV: E=Sophos;i="5.79,360,1602572400"; d="scan'208";a="47682879" Received: from unknown (HELO ironmsg01-sd.qualcomm.com) ([10.53.140.141]) by labrats.qualcomm.com with ESMTP; 20 Jan 2021 02:05:06 -0800 X-QCInternal: smtphost Received: from stor-presley.qualcomm.com ([192.168.140.85]) by ironmsg01-sd.qualcomm.com with ESMTP; 20 Jan 2021 02:05:04 -0800 Received: by stor-presley.qualcomm.com (Postfix, from userid 359480) id 5D6EE21941; Wed, 20 Jan 2021 02:05:04 -0800 (PST) From: Can Guo To: asutoshd@codeaurora.org, nguyenb@codeaurora.org, hongwus@codeaurora.org, linux-scsi@vger.kernel.org, kernel-team@android.com, cang@codeaurora.org Subject: [PATCH v11 2/3] scsi: ufs: Refactor ufshcd_init/exit_clk_scaling/gating() Date: Wed, 20 Jan 2021 02:04:22 -0800 Message-Id: <1611137065-14266-3-git-send-email-cang@codeaurora.org> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1611137065-14266-1-git-send-email-cang@codeaurora.org> References: <1611137065-14266-1-git-send-email-cang@codeaurora.org> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210120_050508_104668_CFAD91DF X-CRM114-Status: GOOD ( 17.56 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: "Martin K. Petersen" , open list , "James E.J. Bottomley" , Adrian Hunter , Satya Tangirala , Avri Altman , "moderated list:ARM/Mediatek SoC support" , Alim Akhtar , Matthias Brugger , Stanley Chu , "moderated list:ARM/Mediatek SoC support" , Bean Huo MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.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. Reviewed-by: Stanley Chu Signed-off-by: Can Guo --- drivers/scsi/ufs/ufshcd.c | 130 +++++++++++++++++++++++++--------------------- drivers/scsi/ufs/ufshcd.h | 4 ++ 2 files changed, 74 insertions(+), 60 deletions(-) diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c index 8dc4a3a..750cf0d 100644 --- a/drivers/scsi/ufs/ufshcd.c +++ b/drivers/scsi/ufs/ufshcd.c @@ -1569,7 +1569,7 @@ 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; @@ -1580,6 +1580,42 @@ 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; @@ -1871,35 +1907,31 @@ 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; - - if (!hba->clk_scaling.min_gear) - hba->clk_scaling.min_gear = UFS_HS_G1; - - 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) @@ -1920,34 +1952,21 @@ static void ufshcd_init_clk_gating(struct ufs_hba *hba) hba->clk_gating.clk_gating_workq = alloc_ordered_workqueue(wq_name, WQ_MEM_RECLAIM | WQ_HIGHPRI); - 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 */ @@ -7747,7 +7766,7 @@ 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); } } @@ -7935,7 +7954,6 @@ 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); } else { ufshcd_clear_ua_wluns(hba); @@ -8365,12 +8383,12 @@ 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; @@ -9144,13 +9162,9 @@ 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); @@ -9351,7 +9365,7 @@ 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; } @@ -9359,7 +9373,7 @@ 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); @@ -9442,10 +9456,6 @@ 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 2863af1..9cd76f7 100644 --- a/drivers/scsi/ufs/ufshcd.h +++ b/drivers/scsi/ufs/ufshcd.h @@ -383,6 +383,7 @@ 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. */ @@ -395,6 +396,7 @@ 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; }; @@ -423,6 +425,7 @@ 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 */ @@ -439,6 +442,7 @@ struct ufs_clk_scaling { u32 min_gear; bool is_enabled; bool is_allowed; + bool is_initialized; bool is_busy_started; bool is_suspended; }; From patchwork Wed Jan 20 10:04:23 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Can Guo X-Patchwork-Id: 12031847 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=-16.9 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,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 3F93AC433DB for ; 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d="scan'208";a="47682880" Received: from unknown (HELO ironmsg01-sd.qualcomm.com) ([10.53.140.141]) by labrats.qualcomm.com with ESMTP; 20 Jan 2021 02:05:10 -0800 X-QCInternal: smtphost Received: from stor-presley.qualcomm.com ([192.168.140.85]) by ironmsg01-sd.qualcomm.com with ESMTP; 20 Jan 2021 02:05:10 -0800 Received: by stor-presley.qualcomm.com (Postfix, from userid 359480) id 6FCCD21941; Wed, 20 Jan 2021 02:05:10 -0800 (PST) From: Can Guo To: asutoshd@codeaurora.org, nguyenb@codeaurora.org, hongwus@codeaurora.org, linux-scsi@vger.kernel.org, kernel-team@android.com, cang@codeaurora.org Subject: [PATCH v11 3/3] scsi: ufs: Revert "Make sure clk scaling happens only when HBA is runtime ACTIVE" Date: Wed, 20 Jan 2021 02:04:23 -0800 Message-Id: <1611137065-14266-4-git-send-email-cang@codeaurora.org> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1611137065-14266-1-git-send-email-cang@codeaurora.org> References: <1611137065-14266-1-git-send-email-cang@codeaurora.org> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210120_050511_126654_F870184D X-CRM114-Status: UNSURE ( 9.23 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: "Martin K. Petersen" , "James E.J. Bottomley" , open list , Avri Altman , "moderated list:ARM/Mediatek SoC support" , Alim Akhtar , Matthias Brugger , Stanley Chu , "moderated list:ARM/Mediatek SoC support" , Bean Huo MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Commit 73cc291c27024 ("Make sure clk scaling happens only when HBA is runtime ACTIVE") is no longer needed since commit 8bd22d3c50e6f ("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 750cf0d..e2517d5 100644 --- a/drivers/scsi/ufs/ufshcd.c +++ b/drivers/scsi/ufs/ufshcd.c @@ -1335,15 +1335,8 @@ 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"),