Re: [Linux-kernel-mentees] [PATCH v2 03/15] scsi: aic7xxx: use generic power management

[Vaibhav Gupta <vaibhavgupta40@gmail.com>]

On Mon, Jul 20, 2020 at 07:04:16PM +0530, Vaibhav Gupta wrote:
> With legacy PM hooks, it was the responsibility of a driver to manage PCI
> states and also the device's power state. The generic approach is to let
> the PCI core handle the work.
> 
> PCI core passes "struct device*" as an argument to the .suspend() and
> .resume() callbacks.
> 
> Driver was using PCI helper functions like pci_save/restore_state(),
> pci_disable/enable_device(), pci_set_power_state() and pci_enable_wake().
> They should not be invoked by the driver.
> 
> Also, .suspend() and .resume() are invoking other functions for PM, which
> were againg bounded by "#ifdef CONFIG_PM" directive. Remove the directive
> and mark those functions as "__maybe_unused".
> 
> Compile-tested only.
> 
> Signed-off-by: Vaibhav Gupta <vaibhavgupta40@gmail.com>
> ---
>  drivers/scsi/aic7xxx/aic7xxx.h         | 10 ++----
>  drivers/scsi/aic7xxx/aic7xxx_core.c    |  6 ++--
>  drivers/scsi/aic7xxx/aic7xxx_osm_pci.c | 46 ++++++--------------------
>  drivers/scsi/aic7xxx/aic7xxx_pci.c     |  4 +--
>  4 files changed, 17 insertions(+), 49 deletions(-)
> 
> diff --git a/drivers/scsi/aic7xxx/aic7xxx.h b/drivers/scsi/aic7xxx/aic7xxx.h
> index 88b90f9806c9..11a09798e6b5 100644
> --- a/drivers/scsi/aic7xxx/aic7xxx.h
> +++ b/drivers/scsi/aic7xxx/aic7xxx.h
> @@ -1134,9 +1134,7 @@ const struct ahc_pci_identity	*ahc_find_pci_device(ahc_dev_softc_t);
>  int			 ahc_pci_config(struct ahc_softc *,
>  					const struct ahc_pci_identity *);
>  int			 ahc_pci_test_register_access(struct ahc_softc *);
> -#ifdef CONFIG_PM
> -void			 ahc_pci_resume(struct ahc_softc *ahc);
> -#endif
> +void __maybe_unused	 ahc_pci_resume(struct ahc_softc *ahc);
>  
>  /*************************** EISA/VL Front End ********************************/
>  struct aic7770_identity *aic7770_find_device(uint32_t);
> @@ -1160,10 +1158,8 @@ int			 ahc_chip_init(struct ahc_softc *ahc);
>  int			 ahc_init(struct ahc_softc *ahc);
>  void			 ahc_intr_enable(struct ahc_softc *ahc, int enable);
>  void			 ahc_pause_and_flushwork(struct ahc_softc *ahc);
> -#ifdef CONFIG_PM
> -int			 ahc_suspend(struct ahc_softc *ahc); 
> -int			 ahc_resume(struct ahc_softc *ahc);
> -#endif
> +int __maybe_unused	 ahc_suspend(struct ahc_softc *ahc);
> +int __maybe_unused	 ahc_resume(struct ahc_softc *ahc);
>  void			 ahc_set_unit(struct ahc_softc *, int);
>  void			 ahc_set_name(struct ahc_softc *, char *);
>  void			 ahc_free(struct ahc_softc *ahc);
> diff --git a/drivers/scsi/aic7xxx/aic7xxx_core.c b/drivers/scsi/aic7xxx/aic7xxx_core.c
> index 3d4df906fa4f..c7eb238a9599 100644
> --- a/drivers/scsi/aic7xxx/aic7xxx_core.c
> +++ b/drivers/scsi/aic7xxx/aic7xxx_core.c
> @@ -5590,8 +5590,7 @@ ahc_pause_and_flushwork(struct ahc_softc *ahc)
>  	ahc->flags &= ~AHC_ALL_INTERRUPTS;
>  }
>  
> -#ifdef CONFIG_PM
> -int
> +int __maybe_unused
>  ahc_suspend(struct ahc_softc *ahc)
>  {
>  
> @@ -5617,7 +5616,7 @@ ahc_suspend(struct ahc_softc *ahc)
>  	return (0);
>  }
>  
> -int
> +int __maybe_unused
>  ahc_resume(struct ahc_softc *ahc)
>  {
>  
> @@ -5626,7 +5625,6 @@ ahc_resume(struct ahc_softc *ahc)
>  	ahc_restart(ahc);
>  	return (0);
>  }
> -#endif
>  /************************** Busy Target Table *********************************/
>  /*
>   * Return the untagged transaction id for a given target/channel lun.
> diff --git a/drivers/scsi/aic7xxx/aic7xxx_osm_pci.c b/drivers/scsi/aic7xxx/aic7xxx_osm_pci.c
> index 9b293b1f0b71..a07e94fac673 100644
> --- a/drivers/scsi/aic7xxx/aic7xxx_osm_pci.c
> +++ b/drivers/scsi/aic7xxx/aic7xxx_osm_pci.c
> @@ -121,47 +121,23 @@ static const struct pci_device_id ahc_linux_pci_id_table[] = {
>  
>  MODULE_DEVICE_TABLE(pci, ahc_linux_pci_id_table);
>  
> -#ifdef CONFIG_PM
> -static int
> -ahc_linux_pci_dev_suspend(struct pci_dev *pdev, pm_message_t mesg)
> +static int __maybe_unused
> +ahc_linux_pci_dev_suspend(struct device *dev)
>  {
> -	struct ahc_softc *ahc = pci_get_drvdata(pdev);
> -	int rc;
> -
> -	if ((rc = ahc_suspend(ahc)))
> -		return rc;
> +	struct ahc_softc *ahc = dev_get_drvdata(dev);
>  
> -	pci_save_state(pdev);
> -	pci_disable_device(pdev);
> -
> -	if (mesg.event & PM_EVENT_SLEEP)
> -		pci_set_power_state(pdev, PCI_D3hot);
> -
> -	return rc;
> +	return ahc_suspend(ahc);
>  }
>  
> -static int
> -ahc_linux_pci_dev_resume(struct pci_dev *pdev)
> +static int __maybe_unused
> +ahc_linux_pci_dev_resume(struct device *dev)
>  {
> -	struct ahc_softc *ahc = pci_get_drvdata(pdev);
> -	int rc;
> -
> -	pci_set_power_state(pdev, PCI_D0);
> -	pci_restore_state(pdev);
> -
> -	if ((rc = pci_enable_device(pdev))) {
> -		dev_printk(KERN_ERR, &pdev->dev,
> -			   "failed to enable device after resume (%d)\n", rc);
> -		return rc;
> -	}
> -
> -	pci_set_master(pdev);
> +	struct ahc_softc *ahc = dev_get_drvdata(dev);
>  
>  	ahc_pci_resume(ahc);
>  
>  	return (ahc_resume(ahc));
>  }
> -#endif
>  
>  static void
>  ahc_linux_pci_dev_remove(struct pci_dev *pdev)
> @@ -319,14 +295,14 @@ ahc_pci_write_config(ahc_dev_softc_t pci, int reg, uint32_t value, int width)
>  	}
>  }
>  
> +static SIMPLE_DEV_PM_OPS(ahc_linux_pci_dev_pm_ops,
> +			 ahc_linux_pci_dev_suspend,
> +			 ahc_linux_pci_dev_resume);
>  
>  static struct pci_driver aic7xxx_pci_driver = {
>  	.name		= "aic7xxx",
>  	.probe		= ahc_linux_pci_dev_probe,
> -#ifdef CONFIG_PM
> -	.suspend	= ahc_linux_pci_dev_suspend,
> -	.resume		= ahc_linux_pci_dev_resume,
> -#endif
> +	.driver.pm	= &ahc_linux_pci_dev_pm_ops,
>  	.remove		= ahc_linux_pci_dev_remove,
>  	.id_table	= ahc_linux_pci_id_table
>  };
> diff --git a/drivers/scsi/aic7xxx/aic7xxx_pci.c b/drivers/scsi/aic7xxx/aic7xxx_pci.c
> index 656f680c7802..dab3a6d12c4d 100644
> --- a/drivers/scsi/aic7xxx/aic7xxx_pci.c
> +++ b/drivers/scsi/aic7xxx/aic7xxx_pci.c
> @@ -2008,8 +2008,7 @@ ahc_pci_chip_init(struct ahc_softc *ahc)
>  	return (ahc_chip_init(ahc));
>  }
>  
> -#ifdef CONFIG_PM
> -void
> +void __maybe_unused
>  ahc_pci_resume(struct ahc_softc *ahc)
>  {
>  	/*
> @@ -2040,7 +2039,6 @@ ahc_pci_resume(struct ahc_softc *ahc)
>  		ahc_release_seeprom(&sd);
>  	}
>  }
> -#endif
>  
>  static int
>  ahc_aic785X_setup(struct ahc_softc *ahc)
> -- 
> 2.27.0
> 
.
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