Which by default will be x86_acpi_suspend_lowlevel.
This registration allows us to register another callback
if there is a need to use another platform specific callback.
CC: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
CC: "H. Peter Anvin" <hpa@xxxxxxxxx>
CC: x86@xxxxxxxxxx
CC: Len Brown <len.brown@xxxxxxxxx>
CC: Joseph Cihula <joseph.cihula@xxxxxxxxx>
CC: Shane Wang <shane.wang@xxxxxxxxx>
CC: linux-pm@xxxxxxxxxxxxxxxxxxxxxxxxxx
CC: linux-acpi@xxxxxxxxxxxxxxx
CC: Len Brown <len.brown@xxxxxxxxx>
Signed-off-by: Liang Tang <liang.tang@xxxxxxxxxx>
[v1: Fix when CONFIG_ACPI_SLEEP is not set]
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
---
arch/x86/include/asm/acpi.h | 2 +-
arch/x86/kernel/acpi/boot.c | 7 +++++++
arch/x86/kernel/acpi/sleep.c | 4 ++--
arch/x86/kernel/acpi/sleep.h | 2 ++
drivers/acpi/sleep.c | 2 ++
5 files changed, 14 insertions(+), 3 deletions(-)
diff --git a/arch/x86/include/asm/acpi.h b/arch/x86/include/asm/acpi.h
index 610001d..68cf060 100644
--- a/arch/x86/include/asm/acpi.h
+++ b/arch/x86/include/asm/acpi.h
@@ -115,7 +115,7 @@ static inline void acpi_disable_pci(void)
}
/* Low-level suspend routine. */
-extern int acpi_suspend_lowlevel(void);
+extern int (*acpi_suspend_lowlevel)(void);
extern const unsigned char acpi_wakeup_code[];
#define acpi_wakeup_address (__pa(TRAMPOLINE_SYM(acpi_wakeup_code)))
diff --git a/arch/x86/kernel/acpi/boot.c b/arch/x86/kernel/acpi/boot.c
index 4558f0d..90e06ef 100644
--- a/arch/x86/kernel/acpi/boot.c
+++ b/arch/x86/kernel/acpi/boot.c
@@ -44,6 +44,7 @@
#include <asm/mpspec.h>
#include <asm/smp.h>
+#include "sleep.h" /* To include x86_acpi_suspend_lowlevel */
static int __initdata acpi_force = 0;
u32 acpi_rsdt_forced;
int acpi_disabled;
@@ -552,6 +553,12 @@ static int acpi_register_gsi_ioapic(struct device *dev, u32 gsi,
int (*__acpi_register_gsi)(struct device *dev, u32 gsi,
int trigger, int polarity) = acpi_register_gsi_pic;
+#ifdef CONFIG_ACPI_SLEEP
+int (*acpi_suspend_lowlevel)(void) = x86_acpi_suspend_lowlevel;
+#else
+int (*acpi_suspend_lowlevel)(void);
+#endif
+
/*
* success: return IRQ number (>=0)
* failure: return < 0
diff --git a/arch/x86/kernel/acpi/sleep.c b/arch/x86/kernel/acpi/sleep.c
index 103b6ab..4d2d0b1 100644
--- a/arch/x86/kernel/acpi/sleep.c
+++ b/arch/x86/kernel/acpi/sleep.c
@@ -25,12 +25,12 @@ static char temp_stack[4096];
#endif
/**
- * acpi_suspend_lowlevel - save kernel state
+ * x86_acpi_suspend_lowlevel - save kernel state
*
* Create an identity mapped page table and copy the wakeup routine to
* low memory.
*/
-int acpi_suspend_lowlevel(void)
+int x86_acpi_suspend_lowlevel(void)
{
struct wakeup_header *header;
/* address in low memory of the wakeup routine. */
diff --git a/arch/x86/kernel/acpi/sleep.h b/arch/x86/kernel/acpi/sleep.h
index 416d4be..4d3feb5 100644
--- a/arch/x86/kernel/acpi/sleep.h
+++ b/arch/x86/kernel/acpi/sleep.h
@@ -13,3 +13,5 @@ extern unsigned long acpi_copy_wakeup_routine(unsigned long);
extern void wakeup_long64(void);
extern void do_suspend_lowlevel(void);
+
+extern int x86_acpi_suspend_lowlevel(void);
diff --git a/drivers/acpi/sleep.c b/drivers/acpi/sleep.c
index 6d9a3ab..355fa4b 100644
--- a/drivers/acpi/sleep.c
+++ b/drivers/acpi/sleep.c
@@ -254,6 +254,8 @@ static int acpi_suspend_enter(suspend_state_t pm_state)
break;
case ACPI_STATE_S3:
+ if (!acpi_suspend_lowlevel)
+ return -ENOSYS;
error = acpi_suspend_lowlevel();
if (error)
return error;
--
1.7.7.4
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