Re: [PATCH V1 1/3] scsi: ufs: export api for use in vendor file

[nitirawa@xxxxxxxxxxxxxx]

On 2021-01-31 19:29, Avri Altman wrote:
> > Exporting functions ufshcd_set_dev_pwr_mode, ufshcd_disable_vreg
> > and ufshcd_enable_vreg so that vendor drivers can make use of
> > them in setting vendor specific regulator setting
> > in vendor specific file.
> As for ufshcd_{enable,disable}_vreg - maybe inline ufshcd_toggle_vreg
> and use it instead?
>
> > Signed-off-by: Nitin Rawat <nitirawa@xxxxxxxxxxxxxx>
> > Signed-off-by: Bao D. Nguyen <nguyenb@xxxxxxxxxxxxxx>
> > Signed-off-by: Veerabhadrarao Badiganti <vbadigan@xxxxxxxxxxxxxx>
> > ---
> >  drivers/scsi/ufs/ufshcd.c | 9 ++++++---
> >  drivers/scsi/ufs/ufshcd.h | 4 ++++
> >  2 files changed, 10 insertions(+), 3 deletions(-)
> >
> > diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
> > index 9c691e4..000a03a 100644
> > --- a/drivers/scsi/ufs/ufshcd.c
> > +++ b/drivers/scsi/ufs/ufshcd.c
> > @@ -8091,7 +8091,7 @@ static int ufshcd_config_vreg(struct device 
> > *dev,
> >         return ret;
> >  }
> >
> > -static int ufshcd_enable_vreg(struct device *dev, struct ufs_vreg 
> > *vreg)
> > +int ufshcd_enable_vreg(struct device *dev, struct ufs_vreg *vreg)
> >  {
> >         int ret = 0;
> >
> > @@ -8110,8 +8110,9 @@ static int ufshcd_enable_vreg(struct device 
> > *dev,
> > struct ufs_vreg *vreg)
> >  out:
> >         return ret;
> >  }
> > +EXPORT_SYMBOL(ufshcd_enable_vreg);
> Why do you need to export it across the kernel?
> Isn't making it non-static suffices?
> Do you need it for a loadable module?
>
> > -static int ufshcd_disable_vreg(struct device *dev, struct ufs_vreg 
> > *vreg)
> > +int ufshcd_disable_vreg(struct device *dev, struct ufs_vreg *vreg)
> >  {
> >         int ret = 0;
> >
> > @@ -8131,6 +8132,7 @@ static int ufshcd_disable_vreg(struct device 
> > *dev,
> > struct ufs_vreg *vreg)
> >  out:
> >         return ret;
> >  }
> > +EXPORT_SYMBOL(ufshcd_disable_vreg);
> >
> >  static int ufshcd_setup_vreg(struct ufs_hba *hba, bool on)
> >  {
> > @@ -8455,7 +8457,7 @@ ufshcd_send_request_sense(struct ufs_hba *hba,
> > struct scsi_device *sdp)
> >   * Returns 0 if requested power mode is set successfully
> >   * Returns non-zero if failed to set the requested power mode
> >   */
> > -static int ufshcd_set_dev_pwr_mode(struct ufs_hba *hba,
> > +int ufshcd_set_dev_pwr_mode(struct ufs_hba *hba,
> >                                      enum ufs_dev_pwr_mode pwr_mode)
> >  {
> >         unsigned char cmd[6] = { START_STOP };
> > @@ -8513,6 +8515,7 @@ static int ufshcd_set_dev_pwr_mode(struct 
> > ufs_hba
> > *hba,
> >         hba->host->eh_noresume = 0;
> >         return ret;
> >  }
> > +EXPORT_SYMBOL(ufshcd_set_dev_pwr_mode);
> >
> >  static int ufshcd_link_state_transition(struct ufs_hba *hba,
> >                                         enum uic_link_state 
> > req_link_state,
> > diff --git a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h
> > index ee61f82..1410c95 100644
> > --- a/drivers/scsi/ufs/ufshcd.h
> > +++ b/drivers/scsi/ufs/ufshcd.h
> > @@ -997,6 +997,10 @@ extern int ufshcd_dme_get_attr(struct ufs_hba 
> > *hba,
> > u32 attr_sel,
> >                                u32 *mib_val, u8 peer);
> >  extern int ufshcd_config_pwr_mode(struct ufs_hba *hba,
> >                         struct ufs_pa_layer_attr *desired_pwr_mode);
> > +extern int ufshcd_set_dev_pwr_mode(struct ufs_hba *hba,
> > +                                               enum ufs_dev_pwr_mode 
> > pwr_mode);
> > +extern int ufshcd_enable_vreg(struct device *dev, struct ufs_vreg 
> > *vreg);
> > +extern int ufshcd_disable_vreg(struct device *dev, struct ufs_vreg 
> > *vreg);
> >
> >  /* UIC command interfaces for DME primitives */
> >  #define DME_LOCAL      0
> > --
> > 2.7.4

Hi Avri,
Thanks for reviewing it.
ufs-qcom.c can be a loadable module, so just inlining won't suffice in 
that case.
Hence export is needed.

Thanks,
Nitin