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Commit 9f324bda authored by Toshi Kani's avatar Toshi Kani Committed by Len Brown
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ACPI: Add CPU hotplug support for processor device objects 



acpi_processor_install_hotplug_notify() registers processor objects to
receive ACPI CPU hotplug event notifications. This patch additionally
registers processor device objects (ACPI0007) to receive the notifications
as well.

Signed-off-by: default avatarToshi Kani <toshi.kani@hp.com>
Reviewed-by: default avatarBjorn Helgaas <bhelgaas@google.com>
Signed-off-by: default avatarLen Brown <len.brown@intel.com>
parent c16fa4f2

drivers/acpi/processor_driver.c

+38 −10
Original line number Diff line number Diff line
@@ -68,6 +68,7 @@ 
#define ACPI_PROCESSOR_NOTIFY_PERFORMANCE 0x80

#define ACPI_PROCESSOR_NOTIFY_POWER	0x81

#define ACPI_PROCESSOR_NOTIFY_THROTTLING	0x82

#define ACPI_PROCESSOR_DEVICE_HID	"ACPI0007"



#define ACPI_PROCESSOR_LIMIT_USER	0

#define ACPI_PROCESSOR_LIMIT_THERMAL	1
@@ -88,7 +89,7 @@ static int acpi_processor_start(struct acpi_processor *pr); 


static const struct acpi_device_id processor_device_ids[] = {

	{ACPI_PROCESSOR_OBJECT_HID, 0},

	{"ACPI0007", 0},

	{ACPI_PROCESSOR_DEVICE_HID, 0},

	{"", 0},

};

MODULE_DEVICE_TABLE(acpi, processor_device_ids);
@@ -741,20 +742,46 @@ static void acpi_processor_hotplug_notify(acpi_handle handle, 
	return;

}



static acpi_status is_processor_device(acpi_handle handle)

{

	struct acpi_device_info *info;

	char *hid;

	acpi_status status;



	status = acpi_get_object_info(handle, &info);

	if (ACPI_FAILURE(status))

		return status;



	if (info->type == ACPI_TYPE_PROCESSOR) {

		kfree(info);

		return AE_OK;	/* found a processor object */

	}



	if (!(info->valid & ACPI_VALID_HID)) {

		kfree(info);

		return AE_ERROR;

	}



	hid = info->hardware_id.string;

	if ((hid == NULL) || strcmp(hid, ACPI_PROCESSOR_DEVICE_HID)) {

		kfree(info);

		return AE_ERROR;

	}



	kfree(info);

	return AE_OK;	/* found a processor device object */

}



static acpi_status

processor_walk_namespace_cb(acpi_handle handle,

			    u32 lvl, void *context, void **rv)

{

	acpi_status status;

	int *action = context;

	acpi_object_type type = 0;



	status = acpi_get_type(handle, &type);

	status = is_processor_device(handle);

	if (ACPI_FAILURE(status))

		return (AE_OK);



	if (type != ACPI_TYPE_PROCESSOR)

		return (AE_OK);

		return AE_OK;	/* not a processor; continue to walk */



	switch (*action) {

	case INSTALL_NOTIFY_HANDLER:
@@ -772,7 +799,8 @@ processor_walk_namespace_cb(acpi_handle handle, 
		break;

	}



	return (AE_OK);

	/* found a processor; skip walking underneath */

	return AE_CTRL_DEPTH;

}



static acpi_status acpi_processor_hotadd_init(struct acpi_processor *pr)
@@ -830,7 +858,7 @@ void acpi_processor_install_hotplug_notify(void) 
{

#ifdef CONFIG_ACPI_HOTPLUG_CPU

	int action = INSTALL_NOTIFY_HANDLER;

	acpi_walk_namespace(ACPI_TYPE_PROCESSOR,

	acpi_walk_namespace(ACPI_TYPE_ANY,

			    ACPI_ROOT_OBJECT,

			    ACPI_UINT32_MAX,

			    processor_walk_namespace_cb, NULL, &action, NULL);
@@ -843,7 +871,7 @@ void acpi_processor_uninstall_hotplug_notify(void) 
{

#ifdef CONFIG_ACPI_HOTPLUG_CPU

	int action = UNINSTALL_NOTIFY_HANDLER;

	acpi_walk_namespace(ACPI_TYPE_PROCESSOR,

	acpi_walk_namespace(ACPI_TYPE_ANY,

			    ACPI_ROOT_OBJECT,

			    ACPI_UINT32_MAX,

			    processor_walk_namespace_cb, NULL, &action, NULL);