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    Subject[PATCH RFC 1/3] drivers/platform/x86: add cpu physically hotplug driver
    Date
    this driver will support cpu phyical add/removal automatically
    after online/offline. if cpu hotpluged, cpu will not
    online automatically, and for cpu offline, we try to
    do actually eject if allowed for cpu like
    "echo 1 > /sys/bus/acpi/devices/LNXCPU\:0X/eject"
    this "echo ..." is only present for recent kernel
    (sorry, can't figure out since when), for a little
    older kernel, there's not such approach AFAICS.

    Signed-off-by: liguang <lig.fnst@cn.fujitsu.com>
    ---
    drivers/platform/x86/Kconfig | 8 ++++
    drivers/platform/x86/Makefile | 1 +
    drivers/platform/x86/cpu_physic_hotplug.c | 60 +++++++++++++++++++++++++++++
    3 files changed, 69 insertions(+), 0 deletions(-)
    create mode 100644 drivers/platform/x86/cpu_physic_hotplug.c

    diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig
    index 8577261..39b2392 100644
    --- a/drivers/platform/x86/Kconfig
    +++ b/drivers/platform/x86/Kconfig
    @@ -789,4 +789,12 @@ config PVPANIC
    a paravirtualized device provided by QEMU; it lets a virtual machine
    (guest) communicate panic events to the host.

    +config QEMU_CPU_PHYSIC_HOTPLUG
    + tristate "physically add/remove cpu after cpu onlined/offlined"
    + depends on ACPI_HOTPLUG_CPU
    + ---help---
    + This driver will support physically remove a cpu after
    + it offlined for QEMU automatically. someone may require this feature
    + to do a physically removal for a cpu.
    +
    endif # X86_PLATFORM_DEVICES
    diff --git a/drivers/platform/x86/Makefile b/drivers/platform/x86/Makefile
    index ef0ec74..2e669b0 100644
    --- a/drivers/platform/x86/Makefile
    +++ b/drivers/platform/x86/Makefile
    @@ -53,3 +53,4 @@ obj-$(CONFIG_APPLE_GMUX) += apple-gmux.o
    obj-$(CONFIG_CHROMEOS_LAPTOP) += chromeos_laptop.o

    obj-$(CONFIG_PVPANIC) += pvpanic.o
    +obj-$(CONFIG_QEMU_CPU_PHYSIC_HOTPLUG) += cpu_physic_hotplug.o
    diff --git a/drivers/platform/x86/cpu_physic_hotplug.c b/drivers/platform/x86/cpu_physic_hotplug.c
    new file mode 100644
    index 0000000..a52c042
    --- /dev/null
    +++ b/drivers/platform/x86/cpu_physic_hotplug.c
    @@ -0,0 +1,60 @@
    +#include <linux/kernel.h>
    +#include <linux/module.h>
    +#include <linux/acpi.h>
    +#include <linux/cpu.h>
    +#include <linux/notifier.h>
    +#include <acpi/processor.h>
    +
    +MODULE_AUTHOR("Li Guang");
    +MODULE_DESCRIPTION("CPU physically hot-plug/unplug Driver");
    +MODULE_LICENSE("GPL");
    +
    +static int cpu_logic_hotplug_notify(struct notifier_block *nfb,
    + unsigned long action, void *hcpu)
    +{
    + unsigned int cpu = (unsigned long)hcpu;
    + struct acpi_processor *pr = per_cpu(processors, cpu);
    +
    + if (pr) {
    + switch (action) {
    + case CPU_ONLINE:
    + break;
    + case CPU_DEAD:
    + break;
    + default:
    + break;
    + }
    + }
    + return NOTIFY_OK;
    +}
    +
    +static struct notifier_block cpu_logic_hotplug_notifier =
    +{
    + .notifier_call = cpu_logic_hotplug_notify,
    +};
    +
    +static int cpu_physic_hotplug_notify(struct notifier_block *nfb,
    + unsigned char *s)
    +{
    +}
    +
    +static struct notifier_block cpu_physic_hotplug_notifier =
    +{
    + .notifier_call = cpu_physic_hotplug_notify,
    +};
    +
    +static int __init cpu_qemu_hotplug_init(void)
    +{
    + register_hotcpu_notifier(&cpu_logic_hotplug_notifier);
    + register_ec_gpe_notifier(&cpu_physic_hotplug_notifier);
    + return 0;
    +}
    +
    +static void __exit cpu_qemu_hotplug_exit(void)
    +{
    + unregister_hotcpu_notifier(&cpu_logic_hotplug_notifier);
    + unregister_ec_gpe_notifier(&cpu_physic_hotplug_notifier);
    +}
    +
    +module_init(cpu_qemu_hotplug_init);
    +module_exit(cpu_qemu_hotplug_exit);
    --
    1.7.2.5


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