On Wed, Jul 27, 2016 at 11:44:12PM +0800, Rui Wang wrote:
> IOAPICs present during system boot aren't added to ioapic_list,
> thus are unable to be hot-removed. Fix it by calling
> acpi_ioapic_add() during root bus enumeration.
>
> Signed-off-by: Rui Wang <rui.y.wang@xxxxxxxxx>
Acked-by: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
I assume Rafael will merge this since it's mostly ACPI changes. Let me
know if you need anything else from me.
> ---
> drivers/acpi/pci_root.c | 10 ++++++++++
> drivers/pci/setup-bus.c | 5 ++++-
> 2 files changed, 14 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/acpi/pci_root.c b/drivers/acpi/pci_root.c
> index 53f5965..fa9c83a 100644
> --- a/drivers/acpi/pci_root.c
> +++ b/drivers/acpi/pci_root.c
> @@ -614,6 +614,16 @@ static int acpi_pci_root_add(struct acpi_device *device,
> if (hotadd) {
> pcibios_resource_survey_bus(root->bus);
> pci_assign_unassigned_root_bus_resources(root->bus);
> + /*
> + * This is only called for the hotadd case. For the boot-time
> + * case, we need to wait until after PCI initialization in
> + * order to deal with IOAPICs mapped in on a PCI BAR.
> + *
> + * This is currently x86-specific, because acpi_ioapic_add()
> + * is an empty function without CONFIG_ACPI_HOTPLUG_IOAPIC.
> + * And CONFIG_ACPI_HOTPLUG_IOAPIC depends on CONFIG_X86_IO_APIC
> + * (see drivers/acpi/Kconfig).
> + */
> acpi_ioapic_add(root->device->handle);
> }
>
> diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c
> index 55641a3..e32c356 100644
> --- a/drivers/pci/setup-bus.c
> +++ b/drivers/pci/setup-bus.c
> @@ -25,6 +25,7 @@
> #include <linux/ioport.h>
> #include <linux/cache.h>
> #include <linux/slab.h>
> +#include <linux/acpi.h>
> #include "pci.h"
>
> unsigned int pci_flags;
> @@ -1779,8 +1780,10 @@ void __init pci_assign_unassigned_resources(void)
> {
> struct pci_bus *root_bus;
>
> - list_for_each_entry(root_bus, &pci_root_buses, node)
> + list_for_each_entry(root_bus, &pci_root_buses, node) {
> pci_assign_unassigned_root_bus_resources(root_bus);
> + acpi_ioapic_add(ACPI_HANDLE(root_bus->bridge));
> + }
> }
>
> void pci_assign_unassigned_bridge_resources(struct pci_dev *bridge)
> --
> 1.8.3.1
>
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