From patchwork Tue Apr 20 06:42:46 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Daejun Park X-Patchwork-Id: 12213463 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=-15.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS 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 EAF2DC433ED for ; Tue, 20 Apr 2021 07:10:08 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C7670613B4 for ; Tue, 20 Apr 2021 07:10:08 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230172AbhDTHKi (ORCPT ); Tue, 20 Apr 2021 03:10:38 -0400 Received: from mailout2.samsung.com ([203.254.224.25]:61262 "EHLO mailout2.samsung.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230018AbhDTHKh (ORCPT ); Tue, 20 Apr 2021 03:10:37 -0400 Received: from epcas3p3.samsung.com (unknown [182.195.41.21]) by mailout2.samsung.com (KnoxPortal) with ESMTP id 20210420071003epoutp028c1df0a87df6e6877b92d895158282fc~3f1c9JkCQ0858008580epoutp02J for ; Tue, 20 Apr 2021 07:10:03 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 mailout2.samsung.com 20210420071003epoutp028c1df0a87df6e6877b92d895158282fc~3f1c9JkCQ0858008580epoutp02J DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=samsung.com; s=mail20170921; t=1618902603; bh=2VjiXl8qVLshY87VkPvcxREY1e05LgoGnPle5Cr6e1s=; h=Subject:Reply-To:From:To:CC:Date:References:From; b=Y6Lxl6AeHXPatTU3/aIEAo7GfhG0xPbDG38urEoNmIajGRWDHxyRpVACHoXbS0rbj r8JL0t8ZKNRQgEmOwBfCNwcZZRJ+5Gf0O8PgYuy40giDGJiKtLCn0oZjvqjoCP1Fcz hpiyCZSomNR/blXbCDqo42rIDEfKWQgxyNoXw1CM= Received: from epsnrtp4.localdomain (unknown [182.195.42.165]) by epcas3p3.samsung.com (KnoxPortal) with ESMTP id 20210420071002epcas3p398412e49cf306f4b0f6b72bb512bb227~3f1cDt6Mp0697206972epcas3p3Z; Tue, 20 Apr 2021 07:10:02 +0000 (GMT) Received: from epcpadp3 (unknown [182.195.40.17]) by epsnrtp4.localdomain (Postfix) with ESMTP id 4FPZZL52Y6z4x9Q6; Tue, 20 Apr 2021 07:10:02 +0000 (GMT) Mime-Version: 1.0 Subject: [PATCH v2] scsi: ufs: Add batched WB buffer flush Reply-To: daejun7.park@samsung.com Sender: Daejun Park From: Daejun Park To: Daejun Park , ALIM AKHTAR , "avri.altman@wdc.com" , "jejb@linux.ibm.com" , "martin.petersen@oracle.com" , "adrian.hunter@intel.com" , "asutoshd@codeaurora.org" , "mchehab+huawei@kernel.org" , Keoseong Park , "lukas.bulwahn@gmail.com" , "beanhuo@micron.com" , "stanley.chu@mediatek.com" , "cang@codeaurora.org" , "nguyenb@codeaurora.org" , "jaegeuk@kernel.org" , Kiwoong Kim , "satyat@google.com" CC: "linux-kernel@vger.kernel.org" , "linux-scsi@vger.kernel.org" , Sung-Jun Park , Jinyoung CHOI , Jieon Seol , Jaemyung Lee , Dukhyun Kwon , JinHwan Park X-Priority: 3 X-Content-Kind-Code: NORMAL X-CPGS-Detection: blocking_info_exchange X-Drm-Type: N,general X-Msg-Generator: Mail X-Msg-Type: PERSONAL X-Reply-Demand: N Message-ID: <2038148563.21618902602689.JavaMail.epsvc@epcpadp3> Date: Tue, 20 Apr 2021 15:42:46 +0900 X-CMS-MailID: 20210420064246epcms2p75e98c1b415731d8d38db86f7397d7fc7 X-Sendblock-Type: AUTO_CONFIDENTIAL X-CPGSPASS: Y X-CPGSPASS: Y X-Hop-Count: 3 X-CMS-RootMailID: 20210420064246epcms2p75e98c1b415731d8d38db86f7397d7fc7 References: Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org Currently, WriteBooster (WB) buffer is always flushed during hibern8. However, this is inefficient because data in the WB buffer can be invalid due to spatial locality of IO workload. If the WB buffer flush is flushed in a batched manner, the amount of data migration and power consumption can be reduced because the overwritten data of the WB buffer may be invalid due to spatial locality. This patch supports batched flush of WB buffer. When batched flush is enabled, fWriteBoosterBufferFlushDuringHibernate is set only when b_rpm_dev_flush_capable is true during runtime suspend. When the device is resumed, fWriteBoosterBufferFlushDuringHibernate is cleared to stop flush during hibern8. Changelog Fix warning reported by kernel test robot. Co-developed-by: Keoseong Park Signed-off-by: Keoseong Park Signed-off-by: Daejun Park --- Documentation/ABI/testing/sysfs-driver-ufs | 9 ++++ drivers/scsi/ufs/ufs-sysfs.c | 50 ++++++++++++++++++++++ drivers/scsi/ufs/ufshcd.c | 14 ++++-- drivers/scsi/ufs/ufshcd.h | 2 + 4 files changed, 71 insertions(+), 4 deletions(-) diff --git a/Documentation/ABI/testing/sysfs-driver-ufs b/Documentation/ABI/testing/sysfs-driver-ufs index d1bc23cb6a9d..b67b8449e840 100644 --- a/Documentation/ABI/testing/sysfs-driver-ufs +++ b/Documentation/ABI/testing/sysfs-driver-ufs @@ -1172,3 +1172,12 @@ Description: This node is used to set or display whether UFS WriteBooster is (if the platform supports UFSHCD_CAP_CLK_SCALING). For a platform that doesn't support UFSHCD_CAP_CLK_SCALING, we can disable/enable WriteBooster through this sysfs node. + +What: /sys/bus/platform/drivers/ufshcd/*/wb_batched_flush +Date: April 2021 +Contact: Daejun Park +Description: This entry shows whether batch flushing of UFS WriteBooster + buffers is enabled. Writing 1 to this entry allows the device to flush + the WriteBooster buffer only when it needs to perform a buffer flush + during runtime suspend. Writing 0 to this entry allows the device to + flush the WriteBooster buffer during link hibernation. diff --git a/drivers/scsi/ufs/ufs-sysfs.c b/drivers/scsi/ufs/ufs-sysfs.c index d7c3cff9662f..943ac12e59c6 100644 --- a/drivers/scsi/ufs/ufs-sysfs.c +++ b/drivers/scsi/ufs/ufs-sysfs.c @@ -253,6 +253,54 @@ static ssize_t wb_on_store(struct device *dev, struct device_attribute *attr, return res < 0 ? res : count; } + +static ssize_t wb_batched_flush_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct ufs_hba *hba = dev_get_drvdata(dev); + + return sysfs_emit(buf, "%d\n", hba->vps->wb_batched_flush); +} + +static ssize_t wb_batched_flush_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct ufs_hba *hba = dev_get_drvdata(dev); + unsigned int wb_batched_flush; + ssize_t res; + + if (!ufshcd_is_wb_allowed(hba)) { + dev_warn(dev, "To control WB through wb_batched_flush is not allowed!\n"); + return -EOPNOTSUPP; + } + + if (kstrtouint(buf, 0, &wb_batched_flush)) + return -EINVAL; + + if (wb_batched_flush != 0 && wb_batched_flush != 1) + return -EINVAL; + + down(&hba->host_sem); + if (!ufshcd_is_user_access_allowed(hba)) { + res = -EBUSY; + goto out; + } + + if (wb_batched_flush == hba->vps->wb_batched_flush) + goto out; + + pm_runtime_get_sync(hba->dev); + res = ufshcd_wb_toggle_flush_during_h8(hba, !wb_batched_flush); + pm_runtime_put_sync(hba->dev); + if (!res) + hba->vps->wb_batched_flush = wb_batched_flush; + +out: + up(&hba->host_sem); + return res < 0 ? res : count; +} + static DEVICE_ATTR_RW(rpm_lvl); static DEVICE_ATTR_RO(rpm_target_dev_state); static DEVICE_ATTR_RO(rpm_target_link_state); @@ -261,6 +309,7 @@ static DEVICE_ATTR_RO(spm_target_dev_state); static DEVICE_ATTR_RO(spm_target_link_state); static DEVICE_ATTR_RW(auto_hibern8); static DEVICE_ATTR_RW(wb_on); +static DEVICE_ATTR_RW(wb_batched_flush); static struct attribute *ufs_sysfs_ufshcd_attrs[] = { &dev_attr_rpm_lvl.attr, @@ -271,6 +320,7 @@ static struct attribute *ufs_sysfs_ufshcd_attrs[] = { &dev_attr_spm_target_link_state.attr, &dev_attr_auto_hibern8.attr, &dev_attr_wb_on.attr, + &dev_attr_wb_batched_flush.attr, NULL }; diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c index 0625da7a42ee..e11dc578a17c 100644 --- a/drivers/scsi/ufs/ufshcd.c +++ b/drivers/scsi/ufs/ufshcd.c @@ -244,7 +244,6 @@ 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_try_to_abort_task(struct ufs_hba *hba, int tag); -static void ufshcd_wb_toggle_flush_during_h8(struct ufs_hba *hba, bool set); static inline void ufshcd_wb_toggle_flush(struct ufs_hba *hba, bool enable); static void ufshcd_hba_vreg_set_lpm(struct ufs_hba *hba); static void ufshcd_hba_vreg_set_hpm(struct ufs_hba *hba); @@ -277,7 +276,8 @@ static inline void ufshcd_wb_config(struct ufs_hba *hba) ufshcd_wb_toggle(hba, true); - ufshcd_wb_toggle_flush_during_h8(hba, true); + ufshcd_wb_toggle_flush_during_h8(hba, !hba->vps->wb_batched_flush); + if (!(hba->quirks & UFSHCI_QUIRK_SKIP_MANUAL_WB_FLUSH_CTRL)) ufshcd_wb_toggle_flush(hba, true); } @@ -5472,7 +5472,7 @@ int ufshcd_wb_toggle(struct ufs_hba *hba, bool enable) return ret; } -static void ufshcd_wb_toggle_flush_during_h8(struct ufs_hba *hba, bool set) +int ufshcd_wb_toggle_flush_during_h8(struct ufs_hba *hba, bool set) { int ret; @@ -5481,10 +5481,12 @@ static void ufshcd_wb_toggle_flush_during_h8(struct ufs_hba *hba, bool set) if (ret) { dev_err(hba->dev, "%s: WB-Buf Flush during H8 %s failed: %d\n", __func__, set ? "enable" : "disable", ret); - return; + return ret; } dev_dbg(hba->dev, "%s WB-Buf Flush during H8 %s\n", __func__, set ? "enabled" : "disabled"); + + return ret; } static inline void ufshcd_wb_toggle_flush(struct ufs_hba *hba, bool enable) @@ -8745,6 +8747,8 @@ static int ufshcd_suspend(struct ufs_hba *hba, enum ufs_pm_op pm_op) ret = ufshcd_set_dev_pwr_mode(hba, req_dev_pwr_mode); if (ret) goto enable_gating; + } else if (hba->vps->wb_batched_flush) { + ufshcd_wb_toggle_flush_during_h8(hba, true); } } @@ -8925,6 +8929,8 @@ static int ufshcd_resume(struct ufs_hba *hba, enum ufs_pm_op pm_op) ufshcd_auto_hibern8_enable(hba); if (hba->dev_info.b_rpm_dev_flush_capable) { + if (hba->vps->wb_batched_flush) + ufshcd_wb_toggle_flush_during_h8(hba, false); hba->dev_info.b_rpm_dev_flush_capable = false; cancel_delayed_work(&hba->rpm_dev_flush_recheck_work); } diff --git a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h index 5eb66a8debc7..049f3f08506c 100644 --- a/drivers/scsi/ufs/ufshcd.h +++ b/drivers/scsi/ufs/ufshcd.h @@ -643,6 +643,7 @@ struct ufs_hba_variant_params { struct devfreq_simple_ondemand_data ondemand_data; u16 hba_enable_delay_us; u32 wb_flush_threshold; + bool wb_batched_flush; }; /** @@ -1105,6 +1106,7 @@ int ufshcd_exec_raw_upiu_cmd(struct ufs_hba *hba, enum query_opcode desc_op); int ufshcd_wb_toggle(struct ufs_hba *hba, bool enable); +int ufshcd_wb_toggle_flush_during_h8(struct ufs_hba *hba, bool set); /* Wrapper functions for safely calling variant operations */ static inline const char *ufshcd_get_var_name(struct ufs_hba *hba)