Messages in this thread | | | Date | Tue, 25 Oct 2011 22:10:16 +0900 | From | Kenji Kaneshige <> | Subject | Re: [PATCH] PCI / ACPI: Make acpiphp ignore root bridges using PCIe native hotplug |
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Looks good. This is also needed for SHPC native hotplug.
Regards, Kenji Kaneshige
(2011/10/22 7:43), Rafael J. Wysocki wrote: > From: Rafael J. Wysocki<rjw@sisk.pl> > > If the kernel has requested control of the PCIe native hotplug > feature for a given root complex, the acpiphp driver should not try > to handle that root complex and it should leave it to pciehp. > Failing to do so causes problems to happen if acpiphp is loaded > before pciehp on such systems. > > To address this issue make find_root_bridges() ignore PCIe root > complexes with PCIe native hotplug enabled and make add_bridge() > return error code if PCIe native hotplug is enabled for the given > root port. This causes acpiphp to refuse to load if PCIe native > hotplug is enabled for all complexes and to refuse binding to > the root complexes with PCIe native hotplug is enabled. > > Signed-off-by: Rafael J. Wysocki<rjw@sisk.pl> > --- > drivers/pci/hotplug/acpiphp_glue.c | 29 ++++++++++++++++++++++++----- > 1 file changed, 24 insertions(+), 5 deletions(-) > > Index: linux/drivers/pci/hotplug/acpiphp_glue.c > =================================================================== > --- linux.orig/drivers/pci/hotplug/acpiphp_glue.c > +++ linux/drivers/pci/hotplug/acpiphp_glue.c > @@ -458,8 +458,17 @@ static int add_bridge(acpi_handle handle > { > acpi_status status; > unsigned long long tmp; > + struct acpi_pci_root *root; > acpi_handle dummy_handle; > > + /* > + * We shouldn't use this bridge if PCIe native hotplug control has been > + * granted by the BIOS for it. > + */ > + root = acpi_pci_find_root(handle); > + if (root&& (root->osc_control_set& OSC_PCI_EXPRESS_NATIVE_HP_CONTROL)) > + return -ENODEV; > + > /* if the bridge doesn't have _STA, we assume it is always there */ > status = acpi_get_handle(handle, "_STA",&dummy_handle); > if (ACPI_SUCCESS(status)) { > @@ -1297,13 +1306,23 @@ static void handle_hotplug_event_func(ac > static acpi_status > find_root_bridges(acpi_handle handle, u32 lvl, void *context, void **rv) > { > + struct acpi_pci_root *root; > int *count = (int *)context; > > - if (acpi_is_root_bridge(handle)) { > - acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY, > - handle_hotplug_event_bridge, NULL); > - (*count)++; > - } > + if (!acpi_is_root_bridge(handle)) > + return AE_OK; > + > + root = acpi_pci_find_root(handle); > + if (!root) > + return AE_OK; > + > + if (root->osc_control_set& OSC_PCI_EXPRESS_NATIVE_HP_CONTROL) > + return AE_OK; > + > + (*count)++; > + acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY, > + handle_hotplug_event_bridge, NULL); > + > return AE_OK ; > } > > -- > To unsubscribe from this list: send the line "unsubscribe linux-acpi" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html >
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