On Thu, 12 Jan 2012 16:29:14 -0800, Linus Torvalds <[email protected]> wrote: > On Wed, Jan 11, 2012 at 9:22 PM, Rusty Russell <[email protected]> wrote: > > > > Amit Shah (12): > > virtio: pci: switch to new PM API > > Hmm. Afaik, this is broken, or at least not complete. > > Sure, it switches to the new PM API, but it still does the PCI ops itself. > > It should not need to - the PCI layer will do the power state and > standard PCI device state saving. And setting the PCI_D3hot state when > shared interrupts can still happen at suspend time is just a bad idea. > > So I think you're doing extra work and introducing bugs by doing so - > the default PCI bus operations should already do all you do, just do > it better. And then you can use the SIMPLE_DEV_PM_OPS() to build the > dev_pm_ops structure and get all the normal cases right automatically. > > I don't know if there is any particularly good example of this, but > you can see some of the network drivers for examples of this. Notice > how they don't need to worry about PCI power states etc at all, they > just need to worry about the actual chip suspend/resume (and for a > network driver, you'd do the netif_device_detach/netif_device_attach > etc)
Ok, I'll confess complete ignorance, and wait for Amit to respond. I must admit that PM for virtual devices is not a personal priority... Thanks, Rusty. _______________________________________________ Virtualization mailing list [email protected] https://lists.linuxfoundation.org/mailman/listinfo/virtualization
