From patchwork Fri Jul 1 07:46:54 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jinyoung Choi X-Patchwork-Id: 12902865 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id E8F3EC433EF for ; Fri, 1 Jul 2022 07:47:03 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235379AbiGAHrD (ORCPT ); Fri, 1 Jul 2022 03:47:03 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43038 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232320AbiGAHrB (ORCPT ); Fri, 1 Jul 2022 03:47:01 -0400 Received: from mailout2.samsung.com (mailout2.samsung.com [203.254.224.25]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 7C8A053D33 for ; Fri, 1 Jul 2022 00:47:00 -0700 (PDT) Received: from epcas2p1.samsung.com (unknown [182.195.41.53]) by mailout2.samsung.com (KnoxPortal) with ESMTP id 20220701074655epoutp024295a5a9d48641175c7dc4cc47198fa2~9pPZCaTlL1274812748epoutp02T for ; 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Fri, 1 Jul 2022 16:46:54 +0900 (KST) Mime-Version: 1.0 Subject: [PATCH v3 1/2] scsi: ufs: wb: renaming & cleanups functions Reply-To: j-young.choi@samsung.com Sender: Jinyoung CHOI From: Jinyoung CHOI To: ALIM AKHTAR , "avri.altman@wdc.com" , "bvanassche@acm.org" , "jejb@linux.ibm.com" , "martin.petersen@oracle.com" , "beanhuo@micron.com" , "adrian.hunter@intel.com" , "linux-scsi@vger.kernel.org" , "linux-kernel@vger.kernel.org" X-Priority: 3 X-Content-Kind-Code: NORMAL In-Reply-To: <20220701074420epcms2p4c4a6a016c7070d5dfa279fc4607caa95@epcms2p4> 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: <20220701074654epcms2p5fcc0a8abe766fa00851b00dff98ad3c7@epcms2p5> Date: Fri, 01 Jul 2022 16:46:54 +0900 X-CMS-MailID: 20220701074654epcms2p5fcc0a8abe766fa00851b00dff98ad3c7 X-Sendblock-Type: AUTO_CONFIDENTIAL X-CPGSPASS: Y X-CPGSPASS: Y CMS-TYPE: 102P X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFprPJsWRmVeSWpSXmKPExsWy7bCmmW7esn1JBr92SFmcfLKGzeLBvG1s Fi9/XmWzOPiwk8Vi2oefzBYvD2laLLqxjcni8q45bBbd13ewWSw//o/Jgcvj8hVvj8V7XjJ5 TFh0gNHj+/oONo+PT2+xePRtWcXo8XmTnEf7gW6mAI6obJuM1MSU1CKF1Lzk/JTMvHRbJe/g eOd4UzMDQ11DSwtzJYW8xNxUWyUXnwBdt8wcoBOVFMoSc0qBQgGJxcVK+nY2RfmlJakKGfnF JbZKqQUpOQXmBXrFibnFpXnpenmpJVaGBgZGpkCFCdkZE29tYi+YaF2xbsJ9lgbGTsMuRk4O CQETiV071zB2MXJxCAnsYJQ48HgekMPBwSsgKPF3hzBIjbCAi8S/zl3sILaQgJLEuTWzwEqE BQwkbvWag4TZBPQkfi6ZwQYyRkTgLLPEwodTmCDm80rMaH/KAmFLS2xfvpURxOYU8JM4P2kN I0RcQ+LHsl5mCFtU4ubqt+ww9vtj86FqRCRa752FqhGUePBzN1RcUuLQoa9sIPdICORLbDgQ CBGukXi7/ABUib7EtY6NYCfwCvhKvGjaAhZnEVCV+Dv5BStEjYvE6o/XwE5mFpCX2P52DjPI SGYBTYn1u/QhpitLHLnFAvNUw8bf7OhsZgE+iY7Df+HiO+Y9YYJoVZNY1GQEEZaR+Hp4PvsE RqVZiFCehWTtLIS1CxiZVzGKpRYU56anFhsVGMEjNjk/dxMjOKVque1gnPL2g94hRiYOxkOM EhzMSiK8bPP2JgnxpiRWVqUW5ccXleakFh9iNAV6eCKzlGhyPjCp55XEG5pYGpiYmRmaG5ka mCuJ83qlbEgUEkhPLEnNTk0tSC2C6WPi4JRqYEp597DoqGTvsvnbneSuJrnPqTi+XK1P7I31 q2tTF/1mZbLNfHQl+1LzxeXddmF65jN3dH/gPDjvj+fTaT4FxbaVpjKGuZN+OLw+/MIwNDRt 0qkHm94fucLO8LmqeYZi7+VpT3dc4vv9Vcngl9geiYNclhmyvren/wxedyNWWp/9xI8PrM7W LTw71bIYm/r5owxW6uQXaNpk7fee197HIePHdzS5r/QtX6n0GceVMVYKiUdZTaTfJuSFPr7K 4xee9u7Ri2k3T6gUmJeXTZo9ge3DXJG7z/U7hHcGaW5zzuD99ss1IU34kEXyms0Vj9T6BNz2 uFnIOK/mX//Vb1L8it/bN669UJpQkHNiwdKLhkosxRmJhlrMRcWJAJNAkJ8yBAAA DLP-Filter: Pass X-CFilter-Loop: Reflected X-CMS-RootMailID: 20220701074420epcms2p4c4a6a016c7070d5dfa279fc4607caa95 References: <20220701074420epcms2p4c4a6a016c7070d5dfa279fc4607caa95@epcms2p4> Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org The Function names were changed clearly, and the location of the comments was modified and added properly. In addition, the conditional test of the toggle functions was different, so it was modified. Unnecessary logs were removed and modified appropriately. Signed-off-by: Jinyoung Choi Reviewed-by: Avri Altman --- drivers/ufs/core/ufs-sysfs.c | 2 +- drivers/ufs/core/ufshcd.c | 69 +++++++++++++++++------------------- include/ufs/ufshcd.h | 7 ++++ 3 files changed, 40 insertions(+), 38 deletions(-) diff --git a/drivers/ufs/core/ufs-sysfs.c b/drivers/ufs/core/ufs-sysfs.c index 0a088b47d557..6253606b93b4 100644 --- a/drivers/ufs/core/ufs-sysfs.c +++ b/drivers/ufs/core/ufs-sysfs.c @@ -230,7 +230,7 @@ static ssize_t wb_on_store(struct device *dev, struct device_attribute *attr, * If the platform supports UFSHCD_CAP_CLK_SCALING, turn WB * on/off will be done while clock scaling up/down. */ - dev_warn(dev, "To control WB through wb_on is not allowed!\n"); + dev_warn(dev, "It is not allowed to control WB!\n"); return -EOPNOTSUPP; } diff --git a/drivers/ufs/core/ufshcd.c b/drivers/ufs/core/ufshcd.c index 1d3214e6b364..f98d023e44ae 100644 --- a/drivers/ufs/core/ufshcd.c +++ b/drivers/ufs/core/ufshcd.c @@ -268,8 +268,7 @@ 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_wb_toggle_buf_flush_during_h8(struct ufs_hba *hba, bool set); static void ufshcd_hba_vreg_set_lpm(struct ufs_hba *hba); static void ufshcd_hba_vreg_set_hpm(struct ufs_hba *hba); @@ -289,16 +288,16 @@ static inline void ufshcd_disable_irq(struct ufs_hba *hba) } } -static inline void ufshcd_wb_config(struct ufs_hba *hba) +static void ufshcd_wb_set_default_flags(struct ufs_hba *hba) { if (!ufshcd_is_wb_allowed(hba)) return; ufshcd_wb_toggle(hba, true); + ufshcd_wb_toggle_buf_flush_during_h8(hba, true); - ufshcd_wb_toggle_flush_during_h8(hba, true); - if (!(hba->quirks & UFSHCI_QUIRK_SKIP_MANUAL_WB_FLUSH_CTRL)) - ufshcd_wb_toggle_flush(hba, true); + if (ufshcd_is_wb_buf_flush_allowed(hba)) + ufshcd_wb_toggle_buf_flush(hba, true); } static void ufshcd_scsi_unblock_requests(struct ufs_hba *hba) @@ -1289,9 +1288,10 @@ static int ufshcd_devfreq_scale(struct ufs_hba *hba, bool scale_up) } } - /* Enable Write Booster if we have scaled up else disable it */ downgrade_write(&hba->clk_scaling_lock); is_writelock = false; + + /* Enable Write Booster if we have scaled up else disable it */ ufshcd_wb_toggle(hba, scale_up); out_unprepare: @@ -5715,6 +5715,9 @@ static int __ufshcd_wb_toggle(struct ufs_hba *hba, bool set, enum flag_idn idn) enum query_opcode opcode = set ? UPIU_QUERY_OPCODE_SET_FLAG : UPIU_QUERY_OPCODE_CLEAR_FLAG; + if (!ufshcd_is_wb_allowed(hba)) + return -EPERM; + index = ufshcd_wb_get_query_index(hba); return ufshcd_query_flag_retry(hba, opcode, idn, index, NULL); } @@ -5723,60 +5726,50 @@ int ufshcd_wb_toggle(struct ufs_hba *hba, bool enable) { int ret; - if (!ufshcd_is_wb_allowed(hba)) - return 0; - - if (!(enable ^ hba->dev_info.wb_enabled)) + if (hba->dev_info.wb_enabled == enable) return 0; ret = __ufshcd_wb_toggle(hba, enable, QUERY_FLAG_IDN_WB_EN); if (ret) { - dev_err(hba->dev, "%s Write Booster %s failed %d\n", + dev_err(hba->dev, "%s: failed to %s WB %d\n", __func__, enable ? "enable" : "disable", ret); return ret; } hba->dev_info.wb_enabled = enable; - dev_info(hba->dev, "%s Write Booster %s\n", - __func__, enable ? "enabled" : "disabled"); return ret; } -static void ufshcd_wb_toggle_flush_during_h8(struct ufs_hba *hba, bool set) +static void ufshcd_wb_toggle_buf_flush_during_h8(struct ufs_hba *hba, + bool enable) { int ret; - ret = __ufshcd_wb_toggle(hba, set, - QUERY_FLAG_IDN_WB_BUFF_FLUSH_DURING_HIBERN8); - if (ret) { - dev_err(hba->dev, "%s: WB-Buf Flush during H8 %s failed: %d\n", - __func__, set ? "enable" : "disable", ret); - return; - } - dev_dbg(hba->dev, "%s WB-Buf Flush during H8 %s\n", - __func__, set ? "enabled" : "disabled"); + ret = __ufshcd_wb_toggle(hba, enable, + QUERY_FLAG_IDN_WB_BUFF_FLUSH_DURING_HIBERN8); + if (ret) + dev_err(hba->dev, "%s: failed to %s WB buf flush during H8 %d\n", + __func__, enable ? "enable" : "disable", ret); } -static inline void ufshcd_wb_toggle_flush(struct ufs_hba *hba, bool enable) +int ufshcd_wb_toggle_buf_flush(struct ufs_hba *hba, bool enable) { int ret; - if (!ufshcd_is_wb_allowed(hba) || - hba->dev_info.wb_buf_flush_enabled == enable) - return; + if (hba->dev_info.wb_buf_flush_enabled == enable) + return 0; ret = __ufshcd_wb_toggle(hba, enable, QUERY_FLAG_IDN_WB_BUFF_FLUSH_EN); if (ret) { - dev_err(hba->dev, "%s WB-Buf Flush %s failed %d\n", __func__, - enable ? "enable" : "disable", ret); - return; + dev_err(hba->dev, "%s: failed to %s WB buf flush %d\n", + __func__, enable ? "enable" : "disable", ret); + return ret; } hba->dev_info.wb_buf_flush_enabled = enable; - dev_dbg(hba->dev, "%s WB-Buf Flush %s\n", - __func__, enable ? "enabled" : "disabled"); + return ret; } static bool ufshcd_wb_presrv_usrspc_keep_vcc_on(struct ufs_hba *hba, @@ -5807,10 +5800,10 @@ static bool ufshcd_wb_presrv_usrspc_keep_vcc_on(struct ufs_hba *hba, static void ufshcd_wb_force_disable(struct ufs_hba *hba) { - if (!(hba->quirks & UFSHCI_QUIRK_SKIP_MANUAL_WB_FLUSH_CTRL)) - ufshcd_wb_toggle_flush(hba, false); + if (ufshcd_is_wb_buf_flush_allowed(hba)) + ufshcd_wb_toggle_buf_flush(hba, false); - ufshcd_wb_toggle_flush_during_h8(hba, false); + ufshcd_wb_toggle_buf_flush_during_h8(hba, false); ufshcd_wb_toggle(hba, false); hba->caps &= ~UFSHCD_CAP_WB_EN; @@ -8197,7 +8190,9 @@ static int ufshcd_probe_hba(struct ufs_hba *hba, bool init_dev_params) */ ufshcd_set_active_icc_lvl(hba); - ufshcd_wb_config(hba); + /* Enable UFS Write Booster if supported */ + ufshcd_wb_set_default_flags(hba); + if (hba->ee_usr_mask) ufshcd_write_ee_control(hba); /* Enable Auto-Hibernate if configured */ diff --git a/include/ufs/ufshcd.h b/include/ufs/ufshcd.h index 7fe1a926cd99..78adc556444a 100644 --- a/include/ufs/ufshcd.h +++ b/include/ufs/ufshcd.h @@ -1017,6 +1017,12 @@ static inline bool ufshcd_is_wb_allowed(struct ufs_hba *hba) return hba->caps & UFSHCD_CAP_WB_EN; } +static inline bool ufshcd_is_wb_buf_flush_allowed(struct ufs_hba *hba) +{ + return ufshcd_is_wb_allowed(hba) && + !(hba->quirks & UFSHCI_QUIRK_SKIP_MANUAL_WB_FLUSH_CTRL); +} + #define ufshcd_writel(hba, val, reg) \ writel((val), (hba)->mmio_base + (reg)) #define ufshcd_readl(hba, reg) \ @@ -1211,6 +1217,7 @@ 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_buf_flush(struct ufs_hba *hba, bool enable); int ufshcd_suspend_prepare(struct device *dev); int __ufshcd_suspend_prepare(struct device *dev, bool rpm_ok_for_spm); void ufshcd_resume_complete(struct device *dev); From patchwork Fri Jul 1 07:48:14 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jinyoung Choi X-Patchwork-Id: 12902866 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id EE806C43334 for ; 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s=mail20170921; t=1656661695; bh=oGukSB9O0xN7U7M7TwsNAjEPd9DF7wPXjNhAN7q1AFw=; h=Subject:Reply-To:From:To:In-Reply-To:Date:References:From; b=rYfvEORACJTVzRgQOmH+hill4AHgZXaExFEKCP1TFk+Uhb9B8+DKDTaKyazpiSkB1 bvFOqBObH8vtfsWFu5gxcPf/SW7zax6/MTEL5dQQfMDDm8WQqcQGB2GFU68JArGLeJ jlBqGgK439no6A8bWS+a1dbYxRBz3wtQGDkioVxM= Received: from epsnrtp4.localdomain (unknown [182.195.42.165]) by epcas2p1.samsung.com (KnoxPortal) with ESMTP id 20220701074814epcas2p19da3e47416f37090e4183eed9a8231f4~9pQivnzrB2588925889epcas2p1S; Fri, 1 Jul 2022 07:48:14 +0000 (GMT) Received: from epsmges2p2.samsung.com (unknown [182.195.36.69]) by epsnrtp4.localdomain (Postfix) with ESMTP id 4LZ6kk2RNcz4x9QL; Fri, 1 Jul 2022 07:48:14 +0000 (GMT) X-AuditID: b6c32a46-0a3ff700000025b2-a6-62bea6be2374 Received: from epcas2p4.samsung.com ( [182.195.41.56]) by epsmges2p2.samsung.com (Symantec Messaging Gateway) with SMTP id F2.D3.09650.EB6AEB26; Fri, 1 Jul 2022 16:48:14 +0900 (KST) Mime-Version: 1.0 Subject: [PATCH v3 2/2] scsi: ufs: wb: Add Manual Flush sysfs Reply-To: j-young.choi@samsung.com Sender: Jinyoung CHOI From: Jinyoung CHOI To: ALIM AKHTAR , "avri.altman@wdc.com" , "bvanassche@acm.org" , "jejb@linux.ibm.com" , "martin.petersen@oracle.com" , "beanhuo@micron.com" , "adrian.hunter@intel.com" , "linux-scsi@vger.kernel.org" , "linux-kernel@vger.kernel.org" X-Priority: 3 X-Content-Kind-Code: NORMAL In-Reply-To: <20220701074420epcms2p4c4a6a016c7070d5dfa279fc4607caa95@epcms2p4> 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: <20220701074814epcms2p8bfb6c00d7364aa704e2d6e60088e6a22@epcms2p8> Date: Fri, 01 Jul 2022 16:48:14 +0900 X-CMS-MailID: 20220701074814epcms2p8bfb6c00d7364aa704e2d6e60088e6a22 X-Sendblock-Type: AUTO_CONFIDENTIAL X-CPGSPASS: Y X-CPGSPASS: Y CMS-TYPE: 102P X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFprPJsWRmVeSWpSXmKPExsWy7bCmhe6+ZfuSDNbtF7Q4+WQNm8WDedvY LF7+vMpmcfBhJ4vFtA8/mS1eHtK0WHRjG5PF5V1z2Cy6r+9gs1h+/B+TA5fH5SveHov3vGTy mLDoAKPH9/UdbB4fn95i8ejbsorR4/MmOY/2A91MARxR2TYZqYkpqUUKqXnJ+SmZeem2St7B 8c7xpmYGhrqGlhbmSgp5ibmptkouPgG6bpk5QCcqKZQl5pQChQISi4uV9O1sivJLS1IVMvKL S2yVUgtScgrMC/SKE3OLS/PS9fJSS6wMDQyMTIEKE7IzXh//xV7wQKzixpnPrA2Mj4S6GDk5 JARMJD6cmMLUxcjFISSwg1HiettXIIeDg1dAUOLvDmGQGmEBW4kWoB4QW0hASeLcmlmMICXC AgYSt3rNQcJsAnoSP5fMYAMZIyJwllli4UOQmSDzeSVmtD9lgbClJbYv38oIYnMK+Emcn7SG ESKuIfFjWS8zhC0qcXP1W3YY+/2x+VA1IhKt985C1QhKPPi5GyouKXHo0Fc2kHskBPIlNhwI hAjXSLxdfgCqRF/iWsdGsBN4BXwl5m+ZAzaGRUBV4mfPfKiRLhINjc/B1jILyEtsfwtSwwFk a0qs36UPMV1Z4sgtFpinGjb+ZkdnMwvwSXQc/gsX3zHvCRNEq5rEoiYjiLCMxNfD89knMCrN QoTyLCRrZyGsXcDIvIpRLLWgODc9tdiowAgescn5uZsYwSlVy20H45S3H/QOMTJxMB5ilOBg VhLhZZu3N0mINyWxsiq1KD++qDQntfgQoynQwxOZpUST84FJPa8k3tDE0sDEzMzQ3MjUwFxJ nNcrZUOikEB6YklqdmpqQWoRTB8TB6dUA9OJbzotBZeb9h2vFJ1meP3ypWLxOyc+Kv4v25m4 4n2oxAeBy3djT1YlhkbU62wQtllksPPrt5m1Cx2zJ7xwlbRYIh5y8FBOYVzidV/TzTvCjtRW NL9WN9u+6C9H6t2Ix9XapQa6r1O/qmapmz/8FuH/ZlrRn+nqE07bR+vfy9p1JP9i3oLjP459 sokx65vBOmP+zfCrHEdzqz0OvvOfeODowi/r13CyP3800cPspo1OwR+FqJlsda2L/z7tPym/ YEZFl3BVdlm/27K6Ry5y3gV7TtsJG/TvWSsW2CoYaVCquo/juMDqGM6PvT3mubv3/VXZkG9R 5rGGrfh4tCL37Zz1Tu6TC2c8NL2xxLotVl2JpTgj0VCLuag4EQDY0PYMMgQAAA== DLP-Filter: Pass X-CFilter-Loop: Reflected X-CMS-RootMailID: 20220701074420epcms2p4c4a6a016c7070d5dfa279fc4607caa95 References: <20220701074420epcms2p4c4a6a016c7070d5dfa279fc4607caa95@epcms2p4> Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org There is the following quirk to bypass "WB Manual Flush" in Write Booster. - UFSHCI_QUIRK_SKIP_MANUAL_WB_FLUSH_CTRL If this quirk is not set, there is no knob that can control "WB Manual Flush". There are three flags that control Write Booster Feature. 1. WB ON/OFF 2. WB Hibern Flush ON/OFF 3. WB Flush ON/OFF The sysfs that controls the WB was implemented. (1) In the case of "Hibern Flush", it is always good to turn on. Control may not be required. (2) Finally, "Manual flush" may be necessary because the Auto-Hibern8 is not supported in a specific environment. So the sysfs that controls this is necessary. (3) Signed-off-by: Jinyoung Choi Reviewed-by: Avri Altman --- drivers/ufs/core/ufs-sysfs.c | 44 ++++++++++++++++++++++++++++++++++++ 1 file changed, 44 insertions(+) diff --git a/drivers/ufs/core/ufs-sysfs.c b/drivers/ufs/core/ufs-sysfs.c index 6253606b93b4..b1c51d8df9f4 100644 --- a/drivers/ufs/core/ufs-sysfs.c +++ b/drivers/ufs/core/ufs-sysfs.c @@ -254,6 +254,48 @@ static ssize_t wb_on_store(struct device *dev, struct device_attribute *attr, return res < 0 ? res : count; } +static ssize_t wb_buf_flush_en_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->dev_info.wb_buf_flush_enabled); +} + +static ssize_t wb_buf_flush_en_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_buf_flush_en; + ssize_t res; + + if (!ufshcd_is_wb_buf_flush_allowed(hba)) { + dev_warn(dev, "It is not allowed to control WB buf flush!\n"); + return -EOPNOTSUPP; + } + + if (kstrtouint(buf, 0, &wb_buf_flush_en)) + return -EINVAL; + + if (wb_buf_flush_en != 0 && wb_buf_flush_en != 1) + return -EINVAL; + + down(&hba->host_sem); + if (!ufshcd_is_user_access_allowed(hba)) { + res = -EBUSY; + goto out; + } + + ufshcd_rpm_get_sync(hba); + res = ufshcd_wb_toggle_buf_flush(hba, wb_buf_flush_en); + ufshcd_rpm_put_sync(hba); +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); @@ -262,6 +304,7 @@ 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_buf_flush_en); static struct attribute *ufs_sysfs_ufshcd_attrs[] = { &dev_attr_rpm_lvl.attr, @@ -272,6 +315,7 @@ 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_buf_flush_en.attr, NULL };