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Subject[PATCH 3/8] ACPI: processor: add __acpi_processor_[un]register_driver helpers.
Date
From: Tang Liang <liang.tang@oracle.com>

This patch implement __acpi_processor_[un]register_driver helper,
so we can registry override processor driver function. Specifically
the Xen processor driver.

By default the values are set to the native one.

Signed-off-by: Tang Liang <liang.tang@oracle.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
---
drivers/acpi/processor_driver.c | 35 +++++++++++++++++++++++++++++------
include/acpi/processor.h | 6 +++++-
2 files changed, 34 insertions(+), 7 deletions(-)
diff --git a/drivers/acpi/processor_driver.c b/drivers/acpi/processor_driver.c
index 211c078..55f0b89 100644
--- a/drivers/acpi/processor_driver.c
+++ b/drivers/acpi/processor_driver.c
@@ -90,6 +90,11 @@ static const struct acpi_device_id processor_device_ids[] = {
};
MODULE_DEVICE_TABLE(acpi, processor_device_ids);

+int (*__acpi_processor_register_driver)(void) = acpi_processor_register_driver;
+void (*__acpi_processor_unregister_driver)(void) \
+ = acpi_processor_unregister_driver;
+
+
static struct acpi_driver acpi_processor_driver = {
.name = "processor",
.class = ACPI_PROCESSOR_CLASS,
@@ -779,6 +784,22 @@ void acpi_processor_uninstall_hotplug_notify(void)
unregister_hotcpu_notifier(&acpi_cpu_notifier);
}

+int acpi_processor_register_driver(void)
+{
+ int result = 0;
+
+ result = acpi_bus_register_driver(&acpi_processor_driver);
+ return result;
+}
+
+void acpi_processor_unregister_driver(void)
+{
+ acpi_bus_unregister_driver(&acpi_processor_driver);
+
+ cpuidle_unregister_driver(&acpi_idle_driver);
+
+ return;
+}
/*
* We keep the driver loaded even when ACPI is not running.
* This is needed for the powernow-k8 driver, that works even without
@@ -794,9 +815,11 @@ static int __init acpi_processor_init(void)

memset(&errata, 0, sizeof(errata));

- result = acpi_bus_register_driver(&acpi_processor_driver);
- if (result < 0)
- return result;
+ if (__acpi_processor_register_driver) {
+ result = __acpi_processor_register_driver();
+ if (result < 0)
+ return result;
+ }

acpi_processor_install_hotplug_notify();

@@ -809,6 +832,7 @@ static int __init acpi_processor_init(void)
return 0;
}

+
static void __exit acpi_processor_exit(void)
{
if (acpi_disabled)
@@ -820,9 +844,8 @@ static void __exit acpi_processor_exit(void)

acpi_processor_uninstall_hotplug_notify();

- acpi_bus_unregister_driver(&acpi_processor_driver);
-
- cpuidle_unregister_driver(&acpi_idle_driver);
+ if (__acpi_processor_unregister_driver)
+ __acpi_processor_unregister_driver();

return;
}
diff --git a/include/acpi/processor.h b/include/acpi/processor.h
index bd99fb6..969cbc9 100644
--- a/include/acpi/processor.h
+++ b/include/acpi/processor.h
@@ -225,6 +225,9 @@ struct acpi_processor_errata {
} piix4;
};

+extern int (*__acpi_processor_register_driver)(void);
+extern void (*__acpi_processor_unregister_driver)(void);
+
extern int acpi_processor_preregister_performance(struct
acpi_processor_performance
__percpu *performance);
@@ -242,7 +245,8 @@ int acpi_processor_notify_smm(struct module *calling_module);

void acpi_processor_install_hotplug_notify(void);
void acpi_processor_uninstall_hotplug_notify(void);
-
+int acpi_processor_register_driver(void);
+void acpi_processor_unregister_driver(void);
int acpi_processor_add(struct acpi_device *device);
int acpi_processor_remove(struct acpi_device *device, int type);
void acpi_processor_notify(struct acpi_device *device, u32 event);
--
1.7.7.3


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