Hi,
On Mon, Sep 07, 2009 at 01:01:14AM +0800, Rafael J. Wysocki wrote:
> On Sunday 06 September 2009, Rafael J. Wysocki wrote:
> > On Tuesday 01 September 2009, Shaohua Li wrote:
> > ...
> > > Updated patch.
> >
> > I looked at it and thought I would do it differently in many places, so
> > below is my version.
> +/*
> + * Apparently, many BIOSes don't implement ACPI _OSC correctly, so let's not use
> + * it by default.
> + */
> +static bool use_acpi_osc;
I'd prefer _OSC is called by default, because without it PCIe PME might not work,
chipset might have internal registers to change in the _OSC. Instead, if _OSC fails,
we just ignore it by default.
> +/**
> + * pcie_pme_handle_request - Find device that generated PME and handle it.
> + * @port: Root port or event collector that generated the PME interrupt.
> + * @req_id: PCIe Requester ID of the device that generated the PME.
> + */
> +static void pcie_pme_handle_request(struct pci_dev *port, u16 req_id)
> +{
> + u8 busnr = req_id >> 8, devfn = req_id & 0xff;
> + struct pci_bus *bus;
> + struct pci_dev *dev;
> + bool found = false;
> +
> + bus = pci_find_bus(pci_domain_nr(port->bus), busnr);
> + if (!bus)
> + goto out;
> +
> + down_read(&pci_bus_sem);
> + list_for_each_entry(dev, &bus->devices, bus_list) {
> + pci_dev_get(dev);
> + if (dev->devfn == devfn) {
> + found = true;
> + break;
> + }
> + pci_dev_put(dev);
> + }
> + up_read(&pci_bus_sem);
> +
> + if (found) {
> + pm_request_resume(&dev->dev);
Sounds we missed the case dev is PCIe-PCI bridge's (secondary bus, devfn 0). In such
case we still need scan the legacy devices under PCIe-PCI bridge
Thanks,
Shaohua
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