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Date: Thu, 18 Mar 2021 09:33:13 +0800
From: Yue Hu <zbestahu@...il.com>
To: Avri Altman <Avri.Altman@....com>
Cc: "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>,
"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
On Wed, 17 Mar 2021 14:02:23 +0000
Avri Altman <Avri.Altman@....com> wrote:
> >
> > 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?
Hi Avri,
Should use "enum query_opcode opcode", rt? will fix it in v2.
Thank you for reviewing the patch!
>
>
> > 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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