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Date: Wed, 17 Mar 2021 14:02:23 +0000
From: Avri Altman <Avri.Altman@....com>
To: Yue Hu <zbestahu@...il.com>,
"martin.petersen@...cle.com" <martin.petersen@...cle.com>,
"jejb@...ux.ibm.com" <jejb@...ux.ibm.com>,
"alim.akhtar@...sung.com" <alim.akhtar@...sung.com>,
"linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>
CC: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"huyue2@...ong.com" <huyue2@...ong.com>,
"zbestahu@....com" <zbestahu@....com>
Subject: RE: [PATCH] scsi: ufs: Tidy up WB configuration code
>
> From: Yue Hu <huyue2@...ong.com>
>
> There are similar code implemetentions for WB configurations in
> ufshcd_wb_{ctrl, toggle_flush_during_h8, toggle_flush}. We can
> extract the part to create a new helper with a flag parameter to
> reduce code duplication.
>
> Meanwhile, change ufshcd_wb_ctrl() -> ufshcd_wb_toggle() for better
> readability.
>
> And remove unnecessary log messages from ufshcd_wb_config() since
> relevant toggle function will spew log respectively. Also change
> ufshcd_wb_toggle_flush{__during_h8} to void type accordingly.
>
> Signed-off-by: Yue Hu <huyue2@...ong.com>
A small nit below, otherwise - looks good to me.
Reviewed-by: Avri Altman <avri.altman@....com>
> ---
> drivers/scsi/ufs/ufs-sysfs.c | 2 +-
> drivers/scsi/ufs/ufshcd.c | 99 +++++++++++++++++++-------------------------
> drivers/scsi/ufs/ufshcd.h | 2 +-
> 3 files changed, 44 insertions(+), 59 deletions(-)
>
> diff --git a/drivers/scsi/ufs/ufs-sysfs.c b/drivers/scsi/ufs/ufs-sysfs.c
> index acc54f5..d7c3cff 100644
> --- a/drivers/scsi/ufs/ufs-sysfs.c
> +++ b/drivers/scsi/ufs/ufs-sysfs.c
> @@ -246,7 +246,7 @@ static ssize_t wb_on_store(struct device *dev, struct
> device_attribute *attr,
> }
>
> pm_runtime_get_sync(hba->dev);
> - res = ufshcd_wb_ctrl(hba, wb_enable);
> + res = ufshcd_wb_toggle(hba, wb_enable);
> pm_runtime_put_sync(hba->dev);
> out:
> up(&hba->host_sem);
> diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
> index 7716175..1368f9e 100644
> --- a/drivers/scsi/ufs/ufshcd.c
> +++ b/drivers/scsi/ufs/ufshcd.c
> @@ -247,8 +247,8 @@ static int ufshcd_change_power_mode(struct ufs_hba
> *hba,
> 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 int ufshcd_wb_toggle_flush_during_h8(struct ufs_hba *hba, bool set);
> -static inline int ufshcd_wb_toggle_flush(struct ufs_hba *hba, bool enable);
> +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);
>
> @@ -275,20 +275,12 @@ static inline void ufshcd_disable_irq(struct ufs_hba
> *hba)
>
> static inline void ufshcd_wb_config(struct ufs_hba *hba)
> {
> - int ret;
> -
> if (!ufshcd_is_wb_allowed(hba))
> return;
>
> - ret = ufshcd_wb_ctrl(hba, true);
> - if (ret)
> - dev_err(hba->dev, "%s: Enable WB failed: %d\n", __func__, ret);
> - else
> - dev_info(hba->dev, "%s: Write Booster Configured\n", __func__);
> - ret = ufshcd_wb_toggle_flush_during_h8(hba, true);
> - if (ret)
> - dev_err(hba->dev, "%s: En WB flush during H8: failed: %d\n",
> - __func__, ret);
> + ufshcd_wb_toggle(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);
> }
> @@ -1268,7 +1260,7 @@ 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;
> - ufshcd_wb_ctrl(hba, scale_up);
> + ufshcd_wb_toggle(hba, scale_up);
>
> out_unprepare:
> ufshcd_clock_scaling_unprepare(hba, is_writelock);
> @@ -5432,85 +5424,78 @@ static void
> ufshcd_bkops_exception_event_handler(struct ufs_hba *hba)
> __func__, err);
> }
>
> -int ufshcd_wb_ctrl(struct ufs_hba *hba, bool enable)
> +static int __ufshcd_wb_toggle(struct ufs_hba *hba, bool set, enum flag_idn
> idn)
> {
> - int ret;
> + int val;
Use turnery here?
> u8 index;
> - enum query_opcode opcode;
> +
> + if (set)
> + val = UPIU_QUERY_OPCODE_SET_FLAG;
> + else
> + val = UPIU_QUERY_OPCODE_CLEAR_FLAG;
> +
> + index = ufshcd_wb_get_query_index(hba);
> + return ufshcd_query_flag_retry(hba, val, idn, index, NULL);
> +}
> +
> +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))
> return 0;
> - if (enable)
> - opcode = UPIU_QUERY_OPCODE_SET_FLAG;
> - else
> - opcode = UPIU_QUERY_OPCODE_CLEAR_FLAG;
>
> - index = ufshcd_wb_get_query_index(hba);
> - ret = ufshcd_query_flag_retry(hba, opcode,
> - QUERY_FLAG_IDN_WB_EN, index, NULL);
> + 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 Write Booster %s failed %d\n",
> __func__, enable ? "enable" : "disable", ret);
> return ret;
> }
>
> hba->dev_info.wb_enabled = enable;
> - dev_dbg(hba->dev, "%s write booster %s %d\n",
> - __func__, enable ? "enable" : "disable", ret);
> + dev_info(hba->dev, "%s Write Booster %s\n",
> + __func__, enable ? "enabled" : "disabled");
>
> return ret;
> }
>
> -static int 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 set)
> {
> - int val;
> - u8 index;
> -
> - if (set)
> - val = UPIU_QUERY_OPCODE_SET_FLAG;
> - else
> - val = UPIU_QUERY_OPCODE_CLEAR_FLAG;
> + int ret;
>
> - index = ufshcd_wb_get_query_index(hba);
> - return ufshcd_query_flag_retry(hba, val,
> - QUERY_FLAG_IDN_WB_BUFF_FLUSH_DURING_HIBERN8,
> - index, NULL);
> + 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");
> }
>
> -static inline int ufshcd_wb_toggle_flush(struct ufs_hba *hba, bool enable)
> +static inline void ufshcd_wb_toggle_flush(struct ufs_hba *hba, bool enable)
> {
> int ret;
> - u8 index;
> - enum query_opcode opcode;
>
> if (!ufshcd_is_wb_allowed(hba) ||
> hba->dev_info.wb_buf_flush_enabled == enable)
> - return 0;
> -
> - if (enable)
> - opcode = UPIU_QUERY_OPCODE_SET_FLAG;
> - else
> - opcode = UPIU_QUERY_OPCODE_CLEAR_FLAG;
> + return;
>
> - index = ufshcd_wb_get_query_index(hba);
> - ret = ufshcd_query_flag_retry(hba, opcode,
> - QUERY_FLAG_IDN_WB_BUFF_FLUSH_EN, index,
> - NULL);
> + 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);
> - goto out;
> + return;
> }
>
> hba->dev_info.wb_buf_flush_enabled = enable;
>
> - dev_dbg(hba->dev, "WB-Buf Flush %s\n", enable ? "enabled" : "disabled");
> -out:
> - return ret;
> -
> + dev_dbg(hba->dev, "%s WB-Buf Flush %s\n",
> + __func__, enable ? "enabled" : "disabled");
> }
>
> static bool ufshcd_wb_presrv_usrspc_keep_vcc_on(struct ufs_hba *hba,
> diff --git a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h
> index 18e56c1..eddc819 100644
> --- a/drivers/scsi/ufs/ufshcd.h
> +++ b/drivers/scsi/ufs/ufshcd.h
> @@ -1099,7 +1099,7 @@ int ufshcd_exec_raw_upiu_cmd(struct ufs_hba
> *hba,
> u8 *desc_buff, int *buff_len,
> enum query_opcode desc_op);
>
> -int ufshcd_wb_ctrl(struct ufs_hba *hba, bool enable);
> +int ufshcd_wb_toggle(struct ufs_hba *hba, bool enable);
>
> /* Wrapper functions for safely calling variant operations */
> static inline const char *ufshcd_get_var_name(struct ufs_hba *hba)
> --
> 1.9.1
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