linux-kernel - Re: [PATCH v4 01/12] virtio: pci: switch to new PM API

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Message-Id: <201112071048.24566.rjw@sisk.pl>
Date:	Wed, 7 Dec 2011 10:48:24 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Amit Shah <amit.shah@...hat.com>
Cc:	Virtualization List <virtualization@...ts.linux-foundation.org>,
	Rusty Russell <rusty@...tcorp.com.au>,
	"Michael S. Tsirkin" <mst@...hat.com>, levinsasha928@...il.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 01/12] virtio: pci: switch to new PM API

On Wednesday, December 07, 2011, Amit Shah wrote:
> Hi Rafael,
> 
> On (Tue) 06 Dec 2011 [23:12:36], Rafael J. Wysocki wrote:
> > Hi,
> > 
> > On Tuesday, December 06, 2011, Amit Shah wrote:
> > > The older PM API doesn't have a way to get notifications on hibernate
> > > events.  Switch to the newer one that gives us those notifications.
> > > 
> > > Signed-off-by: Amit Shah <amit.shah@...hat.com>
> > > ---
> > >  drivers/virtio/virtio_pci.c |   16 ++++++++++++----
> > >  1 files changed, 12 insertions(+), 4 deletions(-)
> > > 
> > > diff --git a/drivers/virtio/virtio_pci.c b/drivers/virtio/virtio_pci.c
> > > index 03d1984..23e1532 100644
> > > --- a/drivers/virtio/virtio_pci.c
> > > +++ b/drivers/virtio/virtio_pci.c
> > > @@ -708,19 +708,28 @@ static void __devexit virtio_pci_remove(struct pci_dev *pci_dev)
> > >  }
> > >  
> > >  #ifdef CONFIG_PM
> > > -static int virtio_pci_suspend(struct pci_dev *pci_dev, pm_message_t state)
> > > +static int virtio_pci_suspend(struct device *dev)
> > >  {
> > > +	struct pci_dev *pci_dev = to_pci_dev(dev);
> > > +
> > >  	pci_save_state(pci_dev);
> > >  	pci_set_power_state(pci_dev, PCI_D3hot);
> > >  	return 0;
> > >  }
> > >  
> > > -static int virtio_pci_resume(struct pci_dev *pci_dev)
> > > +static int virtio_pci_resume(struct device *dev)
> > >  {
> > > +	struct pci_dev *pci_dev = to_pci_dev(dev);
> > > +
> > >  	pci_restore_state(pci_dev);
> > >  	pci_set_power_state(pci_dev, PCI_D0);
> > >  	return 0;
> > >  }
> > > +
> > > +static const struct dev_pm_ops virtio_pci_pm_ops = {
> > > +	.suspend = virtio_pci_suspend,
> > > +	.resume  = virtio_pci_resume,
> > > +};
> > >  #endif
> > 
> > You seem to have forgotten about hibernation callbacks.
> 
> This patch just moves to the new API keeping everything else the same.
> The hibernation callbacks come in patch 2.

OK, but then hibernation will be broken between the two patches, so perhaps
it's better to merge them into one?

> >  Please use
> > one the macros defined in include/linux/pm.h if you want to use the same
> > callback routines for hibernation.
> 
> No, they're different functions, so I don't use the maros.

OK

Thanks,
Rafael
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