linux-kernel - Re: [PATCH v2 02/15] scsi: aacraid: use generic power management

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Date:   Tue, 8 Sep 2020 22:28:04 +0530
From:   Vaibhav Gupta <vaibhavgupta40@...il.com>
To:     Bjorn Helgaas <helgaas@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Bjorn Helgaas <bjorn@...gaas.com>,
        Vaibhav Gupta <vaibhav.varodek@...il.com>,
        Adam Radford <aradford@...il.com>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Adaptec OEM Raid Solutions <aacraid@...rosemi.com>,
        Hannes Reinecke <hare@...e.com>,
        Bradley Grove <linuxdrivers@...otech.com>,
        John Garry <john.garry@...wei.com>,
        Don Brace <don.brace@...rosemi.com>,
        James Smart <james.smart@...adcom.com>,
        Dick Kennedy <dick.kennedy@...adcom.com>,
        Kashyap Desai <kashyap.desai@...adcom.com>,
        Sumit Saxena <sumit.saxena@...adcom.com>,
        Shivasharan S <shivasharan.srikanteshwara@...adcom.com>,
        Sathya Prakash <sathya.prakash@...adcom.com>,
        Sreekanth Reddy <sreekanth.reddy@...adcom.com>,
        Suganath Prabu Subramani 
        <suganath-prabu.subramani@...adcom.com>,
        Jack Wang <jinpu.wang@...ud.ionos.com>
Cc:     Shuah Khan <skhan@...uxfoundation.org>,
        linux-kernel@...r.kernel.org,
        linux-kernel-mentees@...ts.linuxfoundation.org,
        linux-scsi@...r.kernel.org, esc.storagedev@...rosemi.com,
        megaraidlinux.pdl@...adcom.com, MPT-FusionLinux.pdl@...adcom.com
Subject: Re: [PATCH v2 02/15] scsi: aacraid: use generic power management

On Mon, Jul 20, 2020 at 07:04:15PM +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.
> 
> Compile-tested only.
> 
> Signed-off-by: Vaibhav Gupta <vaibhavgupta40@...il.com>
> ---
>  drivers/scsi/aacraid/linit.c | 34 ++++++++--------------------------
>  1 file changed, 8 insertions(+), 26 deletions(-)
> 
> diff --git a/drivers/scsi/aacraid/linit.c b/drivers/scsi/aacraid/linit.c
> index a308e86a97f1..1e44868ee953 100644
> --- a/drivers/scsi/aacraid/linit.c
> +++ b/drivers/scsi/aacraid/linit.c
> @@ -1910,11 +1910,9 @@ static int aac_acquire_resources(struct aac_dev *dev)
>  
>  }
>  
> -#if (defined(CONFIG_PM))
> -static int aac_suspend(struct pci_dev *pdev, pm_message_t state)
> +static int __maybe_unused aac_suspend(struct device *dev)
>  {
> -
> -	struct Scsi_Host *shost = pci_get_drvdata(pdev);
> +	struct Scsi_Host *shost = dev_get_drvdata(dev);
>  	struct aac_dev *aac = (struct aac_dev *)shost->hostdata;
>  
>  	scsi_host_block(shost);
> @@ -1923,29 +1921,16 @@ static int aac_suspend(struct pci_dev *pdev, pm_message_t state)
>  
>  	aac_release_resources(aac);
>  
> -	pci_set_drvdata(pdev, shost);
> -	pci_save_state(pdev);
> -	pci_disable_device(pdev);
> -	pci_set_power_state(pdev, pci_choose_state(pdev, state));
> -
>  	return 0;
>  }
>  
> -static int aac_resume(struct pci_dev *pdev)
> +static int __maybe_unused aac_resume(struct device *dev)
>  {
> -	struct Scsi_Host *shost = pci_get_drvdata(pdev);
> +	struct Scsi_Host *shost = dev_get_drvdata(dev);
>  	struct aac_dev *aac = (struct aac_dev *)shost->hostdata;
> -	int r;
>  
> -	pci_set_power_state(pdev, PCI_D0);
> -	pci_enable_wake(pdev, PCI_D0, 0);
> -	pci_restore_state(pdev);
> -	r = pci_enable_device(pdev);
> +	device_wakeup_disable(dev);
>  
> -	if (r)
> -		goto fail_device;
> -
> -	pci_set_master(pdev);
>  	if (aac_acquire_resources(aac))
>  		goto fail_device;
>  	/*
> @@ -1960,10 +1945,8 @@ static int aac_resume(struct pci_dev *pdev)
>  fail_device:
>  	printk(KERN_INFO "%s%d: resume failed.\n", aac->name, aac->id);
>  	scsi_host_put(shost);
> -	pci_disable_device(pdev);
>  	return -ENODEV;
>  }
> -#endif
>  
>  static void aac_shutdown(struct pci_dev *dev)
>  {
> @@ -2108,15 +2091,14 @@ static struct pci_error_handlers aac_pci_err_handler = {
>  	.resume			= aac_pci_resume,
>  };
>  
> +static SIMPLE_DEV_PM_OPS(aac_pm_ops, aac_suspend, aac_resume);
> +
>  static struct pci_driver aac_pci_driver = {
>  	.name		= AAC_DRIVERNAME,
>  	.id_table	= aac_pci_tbl,
>  	.probe		= aac_probe_one,
>  	.remove		= aac_remove_one,
> -#if (defined(CONFIG_PM))
> -	.suspend	= aac_suspend,
> -	.resume		= aac_resume,
> -#endif
> +	.driver.pm	= &aac_pm_ops,
>  	.shutdown	= aac_shutdown,
>  	.err_handler    = &aac_pci_err_handler,
>  };
> -- 
> 2.27.0
> 
.