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Date:	Thu, 23 Feb 2012 13:29:40 +0000
From:	"Liu, Jinsong" <jinsong.liu@...el.com>
To:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
CC:	"lenb@...nel.org" <lenb@...nel.org>,
	"Brown, Len" <len.brown@...el.com>,
	"xen-devel@...ts.xensource.com" <xen-devel@...ts.xensource.com>,
	Kernel development list <linux-kernel@...r.kernel.org>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	"keir.xen@...il.com" <keir.xen@...il.com>,
	Jan Beulich <JBeulich@...e.com>,
	"Li, Shaohua" <shaohua.li@...el.com>
Subject: [PATCH 1/2] RFC: Prepare PAD for native and xen platform

>From 9a12d7c610bffb900015e8947a57e4e428058abf Mon Sep 17 00:00:00 2001
From: Liu, Jinsong <jinsong.liu@...el.com>
Date: Fri, 24 Feb 2012 01:51:18 +0800
Subject: [PATCH 1/2] Prepare PAD for native and xen platform

This patch is to prepare PAD (Processor Aggregator Device) for native and xen platform.
When working under baremetal it initializes native acpi_pad, while working under
xen platform it would hook to xen acpi_pad (would implement at later patch).

Signed-off-by: Liu, Jinsong <jinsong.liu@...el.com>
---
 drivers/acpi/Kconfig        |    3 ++-
 drivers/acpi/acpi_pad.c     |   21 +++++++++------------
 include/acpi/acpi_drivers.h |   15 +++++++++++++++
 3 files changed, 26 insertions(+), 13 deletions(-)

diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig
index 7556913..2653a98 100644
--- a/drivers/acpi/Kconfig
+++ b/drivers/acpi/Kconfig
@@ -213,10 +213,11 @@ config ACPI_HOTPLUG_CPU
 	default y
 
 config ACPI_PROCESSOR_AGGREGATOR
-	tristate "Processor Aggregator"
+	bool "Processor Aggregator"
 	depends on ACPI_PROCESSOR
 	depends on EXPERIMENTAL
 	depends on X86
+	default n
 	help
 	  ACPI 4.0 defines processor Aggregator, which enables OS to perform
 	  specific processor configuration and control that applies to all
diff --git a/drivers/acpi/acpi_pad.c b/drivers/acpi/acpi_pad.c
index a43fa1a..8aebbe5 100644
--- a/drivers/acpi/acpi_pad.c
+++ b/drivers/acpi/acpi_pad.c
@@ -2,6 +2,7 @@
  * acpi_pad.c ACPI Processor Aggregator Driver
  *
  * Copyright (c) 2009, Intel Corporation.
+ *    Author: Li, Shaohua <shaohua.li@...el.com>
  *
  * This program is free software; you can redistribute it and/or modify it
  * under the terms and conditions of the GNU General Public License,
@@ -32,9 +33,6 @@
 #include <acpi/acpi_drivers.h>
 #include <asm/mwait.h>
 
-#define ACPI_PROCESSOR_AGGREGATOR_CLASS	"acpi_pad"
-#define ACPI_PROCESSOR_AGGREGATOR_DEVICE_NAME "Processor Aggregator"
-#define ACPI_PROCESSOR_AGGREGATOR_NOTIFY 0x80
 static DEFINE_MUTEX(isolated_cpus_lock);
 
 static unsigned long power_saving_mwait_eax;
@@ -510,7 +508,7 @@ static struct acpi_driver acpi_pad_driver = {
 	},
 };
 
-static int __init acpi_pad_init(void)
+static int __init native_acpi_pad_init(void)
 {
 	power_saving_mwait_init();
 	if (power_saving_mwait_eax == 0)
@@ -519,13 +517,12 @@ static int __init acpi_pad_init(void)
 	return acpi_bus_register_driver(&acpi_pad_driver);
 }
 
-static void __exit acpi_pad_exit(void)
+struct acpi_pad_ops acpi_pad_ops = {
+	.init = native_acpi_pad_init,
+};
+
+static int __init acpi_pad_init(void)
 {
-	acpi_bus_unregister_driver(&acpi_pad_driver);
+	return acpi_pad_ops.init();
 }
-
-module_init(acpi_pad_init);
-module_exit(acpi_pad_exit);
-MODULE_AUTHOR("Shaohua Li<shaohua.li@...el.com>");
-MODULE_DESCRIPTION("ACPI Processor Aggregator Driver");
-MODULE_LICENSE("GPL");
+device_initcall(acpi_pad_init);
diff --git a/include/acpi/acpi_drivers.h b/include/acpi/acpi_drivers.h
index bb145e4..d40abbc 100644
--- a/include/acpi/acpi_drivers.h
+++ b/include/acpi/acpi_drivers.h
@@ -115,6 +115,21 @@ void pci_acpi_crs_quirks(void);
 #define ACPI_PROCESSOR_LIMIT_INCREMENT	0x01
 #define ACPI_PROCESSOR_LIMIT_DECREMENT	0x02
 
+/* --------------------------------------------------------------------------
+			PAD (Processor Aggregator Device)
+   -------------------------------------------------------------------------- */
+
+#define ACPI_PROCESSOR_AGGREGATOR_CLASS	"acpi_pad"
+#define ACPI_PROCESSOR_AGGREGATOR_DEVICE_NAME "Processor Aggregator"
+#define ACPI_PROCESSOR_AGGREGATOR_NOTIFY 0x80
+
+struct acpi_pad_ops {
+	int (*init)(void);
+};
+#ifdef CONFIG_ACPI_PROCESSOR_AGGREGATOR
+extern struct acpi_pad_ops acpi_pad_ops;
+#endif
+
 /*--------------------------------------------------------------------------
                                   Dock Station
   -------------------------------------------------------------------------- */
-- 
1.7.1

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