On Wed, 2008-10-29 at 15:19 +0900, Kenji Kaneshige wrote: > Andrew Patterson wrote: > > PCI: check if MSI is enabled before adding _OSC support capability > > > > Ensure that pci=nomsi is not set before adding the _OSC support capability > > OSC_MSI_SUPPORT to the root bridge. > > > > Signed-off-by: Andrew Patterson <andrew.patterson@xxxxxx> > > --- > > > > drivers/acpi/pci_root.c | 20 +++++++++++--------- > > 1 files changed, 11 insertions(+), 9 deletions(-) > > > > > > diff --git a/drivers/acpi/pci_root.c b/drivers/acpi/pci_root.c > > index 75a59ea..32afd02 100644 > > --- a/drivers/acpi/pci_root.c > > +++ b/drivers/acpi/pci_root.c > > @@ -194,6 +194,7 @@ static int __devinit acpi_pci_root_add(struct acpi_device *device) > > unsigned long long value = 0; > > acpi_handle handle = NULL; > > struct acpi_device *child; > > + u32 flags; > > > > > > if (!device) > > @@ -211,17 +212,18 @@ static int __devinit acpi_pci_root_add(struct acpi_device *device) > > > > device->ops.bind = acpi_pci_bind; > > > > - pci_acpi_osc_support(device->handle, > > - OSC_EXT_PCI_CONFIG_SUPPORT | > > - OSC_PCI_SEGMENT_GROUPS_SUPPORT | > > -#ifdef CONFIG_PCI_MSI > > - OSC_MSI_SUPPORT | > > -#endif > > + flags = (OSC_EXT_PCI_CONFIG_SUPPORT | > > + OSC_PCI_SEGMENT_GROUPS_SUPPORT | > > #ifdef CONFIG_PCIEASPM > > - OSC_ACTIVE_STATE_PWR_SUPPORT | > > - OSC_CLOCK_PWR_CAPABILITY_SUPPORT | > > + OSC_ACTIVE_STATE_PWR_SUPPORT | > > + OSC_CLOCK_PWR_CAPABILITY_SUPPORT | > > +#endif > > + 0); > > +#ifdef CONFIG_PCI_MSI > > + if (pci_msi_enabled()) > > + flags |= OSC_MSI_SUPPORT; > > #endif > > - 0); > > + pci_acpi_osc_support(device->handle, flags); > > > > /* > > * Segment > > I think the 'pci_msi_enable' variable can be changed after > acpi_pci_root_add() is called by quirk_disable_all_msi() > (in driver/pci/quirk.c). I am not sure what to do about this one. I think the correct thing to do is use Matthew's as yet unwritten root bridge iterator function to remove the OSC_MSI_SUPPORT flag for all root bridges. I suspect that it will not hurt to have this flag set given that we disable the use of all MSI. Andrew > Thanks, > Kenji Kaneshige > -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
