linux-kernel - [PATCH RFC 3/3] cpu_physic_hotplug: register handler for ec space notifier

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Date:	Thu, 6 Jun 2013 09:32:16 +0800
From:	liguang <lig.fnst@...fujitsu.com>
To:	Len Brown <lenb@...nel.org>, "Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Matthew Garrett <matthew.garrett@...ula.com>,
	linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org,
	platform-driver-x86@...r.kernel.org,
	liguang <lig.fnst@...fujitsu.com>
Subject: [PATCH RFC 3/3] cpu_physic_hotplug: register handler for ec space notifier

Signed-off-by: liguang <lig.fnst@...fujitsu.com>
---
 drivers/platform/x86/cpu_physic_hotplug.c |   27 +++++++++++++++++++++++++--
 1 files changed, 25 insertions(+), 2 deletions(-)

diff --git a/drivers/platform/x86/cpu_physic_hotplug.c b/drivers/platform/x86/cpu_physic_hotplug.c
index a52c042..a84c999 100644
--- a/drivers/platform/x86/cpu_physic_hotplug.c
+++ b/drivers/platform/x86/cpu_physic_hotplug.c
@@ -9,6 +9,9 @@ MODULE_AUTHOR("Li Guang");
 MODULE_DESCRIPTION("CPU physically hot-plug/unplug Driver");
 MODULE_LICENSE("GPL");
 
+#define EC_SPACE_CPU_IDX       3
+#define EC_SPACE_CPU_OFFSET    4
+
 static int cpu_logic_hotplug_notify(struct notifier_block *nfb,
 				unsigned long action, void *hcpu)
 {
@@ -36,6 +39,26 @@ static struct notifier_block cpu_logic_hotplug_notifier =
 static int cpu_physic_hotplug_notify(struct notifier_block *nfb,
 				 unsigned char *s)
 {
+	u8 index = 0, val = 0;
+	bool cpu_state = false;
+	struct acpi_processor *pr;
+
+	ec_read(EC_SPACE_CPU_IDX, &index);
+	if (index == 0)
+		goto out;
+	pr = per_cpu(processors, index);
+
+	ec_read(EC_SPACE_CPU_OFFSET + index/8, &val);
+	if (val & 1 << index/8)
+		cpu_state = true;
+
+	if (pr->flags.need_hotplug_init & cpu_state)
+		cpu_up(pr->id);
+	else
+		cpu_down(pr->id);
+
+out:
+    return NOTIFY_OK;
 }
 
 static struct notifier_block cpu_physic_hotplug_notifier =
@@ -46,14 +69,14 @@ static struct notifier_block cpu_physic_hotplug_notifier =
 static int __init cpu_qemu_hotplug_init(void)
 {
 	register_hotcpu_notifier(&cpu_logic_hotplug_notifier);
-	register_ec_gpe_notifier(&cpu_physic_hotplug_notifier);
+	register_ec_space_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);
+	unregister_ec_space_notifier(&cpu_physic_hotplug_notifier);
 }
 
 module_init(cpu_qemu_hotplug_init);
-- 
1.7.2.5

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