RE: [PATCH] scsi: ufs: wb: Add Manual Flush sysfs and cleanup toggle functions

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



> 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@xxxxxxxxxxx>
> ---
>  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




[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[Index of Archives]     [SCSI Target Devel]     [Linux SCSI Target Infrastructure]     [Kernel Newbies]     [IDE]     [Security]     [Git]     [Netfilter]     [Bugtraq]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux RAID]     [Linux ATA RAID]     [Linux IIO]     [Samba]     [Device Mapper]

  Powered by Linux