linux-kernel - Re: [PATCH v4 4/4] vfio/pci: Move the unused device into low power state with runtime PM

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Date:   Tue, 17 May 2022 14:02:59 -0600
From:   Alex Williamson <alex.williamson@...hat.com>
To:     Abhishek Sahu <abhsahu@...dia.com>
Cc:     Cornelia Huck <cohuck@...hat.com>,
        Yishai Hadas <yishaih@...dia.com>,
        Jason Gunthorpe <jgg@...dia.com>,
        Shameer Kolothum <shameerali.kolothum.thodi@...wei.com>,
        Kevin Tian <kevin.tian@...el.com>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        Max Gurtovoy <mgurtovoy@...dia.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        <linux-kernel@...r.kernel.org>, <kvm@...r.kernel.org>,
        <linux-pm@...r.kernel.org>, <linux-pci@...r.kernel.org>
Subject: Re: [PATCH v4 4/4] vfio/pci: Move the unused device into low power
 state with runtime PM

On Tue, 17 May 2022 15:32:19 +0530
Abhishek Sahu <abhsahu@...dia.com> wrote:
> diff --git a/drivers/vfio/pci/vfio_pci_core.c b/drivers/vfio/pci/vfio_pci_core.c
> index 4fe9a4efc751..5ea1b3099036 100644
> --- a/drivers/vfio/pci/vfio_pci_core.c
> +++ b/drivers/vfio/pci/vfio_pci_core.c
> @@ -156,7 +156,7 @@ static void vfio_pci_probe_mmaps(struct vfio_pci_core_device *vdev)
>  }
>  
>  struct vfio_pci_group_info;
> -static bool vfio_pci_dev_set_try_reset(struct vfio_device_set *dev_set);
> +static void vfio_pci_dev_set_try_reset(struct vfio_device_set *dev_set);
>  static int vfio_pci_dev_set_hot_reset(struct vfio_device_set *dev_set,
>  				      struct vfio_pci_group_info *groups);
>  
> @@ -275,6 +275,19 @@ void vfio_pci_lock_and_set_power_state(struct vfio_pci_core_device *vdev,
>  	up_write(&vdev->memory_lock);
>  }
>  
> +#ifdef CONFIG_PM

Neither of the CONFIG_PM checks added are actually needed afaict, both
struct dev_pm_ops and the pm pointer on struct device_driver are defined
regardless.  Thanks,

Alex