Re: [PATCH v3 2/5] x86/ioapic: Support hot-removal of IOAPICs present during boot

Rafael J. Wysocki
2016-08-17T00:30:02Z

On Wednesday, August 10, 2016 12:01:55 PM 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@intel.com>

This patch has been ACKed by Bjorn, right?

In which case you should have added the Acked-by tag to it when reposting.

> ---
> 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 b07eda1..bf601d4 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 c74059e..ec538d3 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;
> @@ -1852,8 +1853,10 @@ 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)
>

--
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.