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Date: Fri, 22 Apr 2022 13:46:13 +0000
From: Avri Altman <Avri.Altman@....com>
To: "j-young.choi@...sung.com" <j-young.choi@...sung.com>,
ALIM AKHTAR <alim.akhtar@...sung.com>,
"jejb@...ux.ibm.com" <jejb@...ux.ibm.com>,
"martin.petersen@...cle.com" <martin.petersen@...cle.com>,
"bvanassche@....org" <bvanassche@....org>,
"beanhuo@...ron.com" <beanhuo@...ron.com>,
Daejun Park <daejun7.park@...sung.com>,
"adrian.hunter@...el.com" <adrian.hunter@...el.com>,
"cang@...eaurora.org" <cang@...eaurora.org>,
"asutoshd@...eaurora.org" <asutoshd@...eaurora.org>,
"linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] scsi: ufs: wb: Add Manual Flush sysfs and cleanup toggle
functions
> There is the following quirk to bypass "WB Manual Flush" in Write
> Booster.
>
> - UFSHCD_QUIRK_SKIP_MANUAL_WB_FLUSH_CTRL
UFSHCD_ --> UFSHCI_
>
> If this quirk is not set, there is no knob that can controll "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 determined that it can affect
> performance or power consumption.
> So the sysfs that controls this may be necessary. (3)
>
> In addition, toggle functions for controlling the above flags are cleaned.
>
> Signed-off-by: Jinyoung Choi <j-young.choi@...sung.com>
> ---
> drivers/scsi/ufs/ufs-sysfs.c | 46 ++++++++++++++++++-
> drivers/scsi/ufs/ufs.h | 2 +-
> drivers/scsi/ufs/ufshcd.c | 86 +++++++++++++++++-------------------
> drivers/scsi/ufs/ufshcd.h | 7 +++
> 4 files changed, 94 insertions(+), 47 deletions(-)
>
> diff --git a/drivers/scsi/ufs/ufs-sysfs.c b/drivers/scsi/ufs/ufs-sysfs.c
> index 5c405ff7b6ea..6bbb56152708 100644
> --- a/drivers/scsi/ufs/ufs-sysfs.c
> +++ b/drivers/scsi/ufs/ufs-sysfs.c
> @@ -229,7 +229,7 @@ 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, "To control Write Booster is not allowed!\n");
> return -EOPNOTSUPP;
> }
>
> @@ -253,6 +253,48 @@ static ssize_t wb_on_store(struct device *dev,
> struct device_attribute *attr,
> return res < 0 ? res : count;
> }
>
> +static ssize_t wb_flush_on_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_flush_enabled);
> +}
> +
> +static ssize_t wb_flush_on_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_flush_enable;
> + ssize_t res;
> +
> + if (!ufshcd_is_wb_flush_allowed(hba)) {
> + dev_warn(dev, "To control WB Flush is not allowed!\n");
> + return -EOPNOTSUPP;
> + }
> +
> + if (kstrtouint(buf, 0, &wb_flush_enable))
> + return -EINVAL;
> +
> + if (wb_flush_enable != 0 && wb_flush_enable != 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_flush(hba, wb_flush_enable);
> + 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);
> @@ -261,6 +303,7 @@ 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_flush_on);
Maybe wb_flush_enable ?
>
> static struct attribute *ufs_sysfs_ufshcd_attrs[] = {
> &dev_attr_rpm_lvl.attr,
> @@ -271,6 +314,7 @@ 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_flush_on.attr,
> NULL
> };
>
> diff --git a/drivers/scsi/ufs/ufs.h b/drivers/scsi/ufs/ufs.h
> index 4a00c24a3209..6c85f512f82f 100644
> --- a/drivers/scsi/ufs/ufs.h
> +++ b/drivers/scsi/ufs/ufs.h
> @@ -611,7 +611,7 @@ struct ufs_dev_info {
>
> /* UFS WB related flags */
> bool wb_enabled;
> - bool wb_buf_flush_enabled;
> + bool wb_flush_enabled;
> u8 wb_dedicated_lu;
> u8 wb_buffer_type;
>
> diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
> index 3f9caafa91bf..7bd510582471 100644
> --- a/drivers/scsi/ufs/ufshcd.c
> +++ b/drivers/scsi/ufs/ufshcd.c
> @@ -249,7 +249,6 @@ 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);
>
> @@ -269,7 +268,7 @@ 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;
> @@ -277,7 +276,7 @@ static inline void ufshcd_wb_config(struct ufs_hba
> *hba)
> ufshcd_wb_toggle(hba, true);
>
> ufshcd_wb_toggle_flush_during_h8(hba, true);
> - if (!(hba->quirks & UFSHCI_QUIRK_SKIP_MANUAL_WB_FLUSH_CTRL))
> + if (ufshcd_is_wb_flush_allowed(hba))
> ufshcd_wb_toggle_flush(hba, true);
> }
>
> @@ -608,7 +607,7 @@ static void ufshcd_device_reset(struct ufs_hba *hba)
> ufshcd_set_ufs_dev_active(hba);
> if (ufshcd_is_wb_allowed(hba)) {
> hba->dev_info.wb_enabled = false;
> - hba->dev_info.wb_buf_flush_enabled = false;
> + hba->dev_info.wb_flush_enabled = false;
> }
> }
> if (err != -EOPNOTSUPP)
> @@ -5689,74 +5688,70 @@ static void
> ufshcd_temp_exception_event_handler(struct ufs_hba *hba, u16 status)
> */
> }
>
> -static int __ufshcd_wb_toggle(struct ufs_hba *hba, bool set, enum flag_idn
> idn)
> +static int __ufshcd_wb_toggle(struct ufs_hba *hba, const char *knob,
> + bool set, enum flag_idn idn)
> {
> + int ret;
> u8 index;
> enum query_opcode opcode = set ? UPIU_QUERY_OPCODE_SET_FLAG :
> - UPIU_QUERY_OPCODE_CLEAR_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);
> +
> + ret = ufshcd_query_flag_retry(hba, opcode, idn, index, NULL);
> + if (ret) {
> + dev_err(hba->dev, "%s: %s %s failed %d\n",
> + __func__, knob, set ? "enable" : "disable", ret);
> + return ret;
> + }
> +
> + dev_dbg(hba->dev, "%s: %s %s\n",
> + __func__, knob, set ? "enabled" : "disabled");
> +
> + return ret;
> }
Is this debug info (knob extra argument) worth the complication?
Thanks,
Avri
>
> int ufshcd_wb_toggle(struct ufs_hba *hba, bool enable)
> {
> int ret;
>
> - if (!ufshcd_is_wb_allowed(hba))
> + if (hba->dev_info.wb_enabled == enable)
> return 0;
>
> - if (!(enable ^ hba->dev_info.wb_enabled))
> - 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",
> - __func__, enable ? "enable" : "disable", ret);
> + ret = __ufshcd_wb_toggle(hba, "Write Booster", enable,
> + QUERY_FLAG_IDN_WB_EN);
> + if (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_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");
> + __ufshcd_wb_toggle(hba, "WB-Buf Flush during H8", enable,
> + QUERY_FLAG_IDN_WB_BUFF_FLUSH_DURING_HIBERN8);
> }
>
> -static inline void ufshcd_wb_toggle_flush(struct ufs_hba *hba, bool enable)
> +int ufshcd_wb_toggle_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_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;
> - }
> + ret = __ufshcd_wb_toggle(hba, "WB-Buf Flush", enable,
> + QUERY_FLAG_IDN_WB_BUFF_FLUSH_EN);
> + if (ret)
> + return ret;
>
> - hba->dev_info.wb_buf_flush_enabled = enable;
> + hba->dev_info.wb_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,
> @@ -5790,7 +5785,7 @@ 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))
> + if (ufshcd_is_wb_flush_allowed(hba))
> ufshcd_wb_toggle_flush(hba, false);
>
> ufshcd_wb_toggle_flush_during_h8(hba, false);
> @@ -8178,7 +8173,8 @@ static int ufshcd_probe_hba(struct ufs_hba *hba,
> bool init_dev_params)
> */
> ufshcd_set_active_icc_lvl(hba);
>
> - ufshcd_wb_config(hba);
> + ufshcd_wb_set_default_flags(hba);
> +
> if (hba->ee_usr_mask)
> ufshcd_write_ee_control(hba);
> /* Enable Auto-Hibernate if configured */
> diff --git a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h
> index 94f545be183a..abd2be248dc5 100644
> --- a/drivers/scsi/ufs/ufshcd.h
> +++ b/drivers/scsi/ufs/ufshcd.h
> @@ -991,6 +991,12 @@ static inline bool ufshcd_is_wb_allowed(struct
> ufs_hba *hba)
> return hba->caps & UFSHCD_CAP_WB_EN;
> }
>
> +static inline bool ufshcd_is_wb_flush_allowed(struct ufs_hba *hba)
> +{
> + return ufshcd_is_wb_allowed(hba) &&
> + !(hba->quirks & UFSHCI_QUIRK_SKIP_MANUAL_WB_FLUSH_CTRL);
> +}
> +
> static inline bool ufshcd_is_user_access_allowed(struct ufs_hba *hba)
> {
> return !hba->shutting_down;
> @@ -1209,6 +1215,7 @@ 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(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);
> --
> 2.25.1
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