linux-kernel - [RFC PATCH 3/6] ACPI: sleep: Update acpi_set_firmware_waking_vector() invocations to favor 32-bit firmware waking vector.

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Date:	Wed, 28 May 2014 01:28:06 +0800
From:	Lv Zheng <zetalog@...il.com>
To:	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
	Len Brown <len.brown@...el.com>
Cc:	Lv Zheng <zetalog@...il.com>, Lv Zheng <lv.zheng@...el.com>,
	<linux-kernel@...r.kernel.org>, linux-acpi@...r.kernel.org,
	Oswald Buddenhagen <ossi@....org>
Subject: [RFC PATCH 3/6] ACPI: sleep: Update acpi_set_firmware_waking_vector() invocations to favor 32-bit firmware waking vector.

From: Lv Zheng <lv.zheng@...el.com>

This patch updates acpi_set_firmware_waking_vector() invocations in order
to keep 32-bit firmware waking vector favor for Linux.

64-bit firmware waking vector has never been enabled by Linux.  The
(acpi_physical_address)0 for 64-bit address can be used to force ACPICA to
set only 32-bit firmware waking vector for Linux.

Signed-off-by: Lv Zheng <lv.zheng@...el.com>
Cc: Oswald Buddenhagen <ossi@....org>
---
 arch/ia64/include/asm/acpi.h |    1 +
 arch/x86/include/asm/acpi.h  |    3 ++-
 drivers/acpi/sleep.c         |    8 ++++++--
 3 files changed, 9 insertions(+), 3 deletions(-)

diff --git a/arch/ia64/include/asm/acpi.h b/arch/ia64/include/asm/acpi.h
index 75dc59a..45e45ec 100644
--- a/arch/ia64/include/asm/acpi.h
+++ b/arch/ia64/include/asm/acpi.h
@@ -75,6 +75,7 @@ int acpi_gsi_to_irq (u32 gsi, unsigned int *irq);
 extern int acpi_suspend_lowlevel(void);
 
 extern unsigned long acpi_wakeup_address;
+#define acpi_wakeup_address64	((acpi_physical_address)0)
 
 /*
  * Record the cpei override flag and current logical cpu. This is
diff --git a/arch/x86/include/asm/acpi.h b/arch/x86/include/asm/acpi.h
index e06225e..46a7dd8 100644
--- a/arch/x86/include/asm/acpi.h
+++ b/arch/x86/include/asm/acpi.h
@@ -71,7 +71,8 @@ static inline void acpi_disable_pci(void)
 extern int (*acpi_suspend_lowlevel)(void);
 
 /* Physical address to resume after wakeup */
-#define acpi_wakeup_address ((unsigned long)(real_mode_header->wakeup_start))
+#define acpi_wakeup_address	((acpi_physical_address)(real_mode_header->wakeup_start))
+#define acpi_wakeup_address64	((acpi_physical_address)(0))
 
 /*
  * Check if the CPU can handle C2 and deeper
diff --git a/drivers/acpi/sleep.c b/drivers/acpi/sleep.c
index c11e379..5ca7ab0 100644
--- a/drivers/acpi/sleep.c
+++ b/drivers/acpi/sleep.c
@@ -23,6 +23,8 @@
 #include "internal.h"
 #include "sleep.h"
 
+#define ACPI_NO_WAKING_VECTOR		((acpi_physical_address)0)
+
 static u8 sleep_states[ACPI_S_STATE_COUNT];
 
 static void acpi_sleep_tts_switch(u32 acpi_state)
@@ -59,7 +61,8 @@ static int acpi_sleep_prepare(u32 acpi_state)
 	if (acpi_state == ACPI_STATE_S3) {
 		if (!acpi_wakeup_address)
 			return -EFAULT;
-		acpi_set_firmware_waking_vector(acpi_wakeup_address);
+		acpi_set_firmware_waking_vector(acpi_wakeup_address,
+						acpi_wakeup_address64);
 
 	}
 	ACPI_FLUSH_CPU_CACHE();
@@ -403,7 +406,8 @@ static void acpi_pm_finish(void)
 	acpi_leave_sleep_state(acpi_state);
 
 	/* reset firmware waking vector */
-	acpi_set_firmware_waking_vector((acpi_physical_address) 0);
+	acpi_set_firmware_waking_vector(ACPI_NO_WAKING_VECTOR,
+					ACPI_NO_WAKING_VECTOR);
 
 	acpi_target_sleep_state = ACPI_STATE_S0;
 
-- 
1.7.10

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