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x86 / ACPI / sleep: Provide registration for acpi_suspend_lowlevel.

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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.

Signed-off-by: Liang Tang <liang.tang@oracle.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Tested-by: Ben Guthro <benjamin.guthro@citrix.com>
Acked-by: "H. Peter Anvin" <hpa@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Konrad Rzeszutek Wilk 2013-05-14 17:09:16 +00:00 committed by Rafael J. Wysocki
parent 7d13205581
commit d6a77ead21
5 changed files with 14 additions and 3 deletions
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2
arch/x86/include/asm/acpi.h
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@ -111,7 +111,7 @@ static inline void acpi_disable_pci(void)
} }
/* Low-level suspend routine. */ /* Low-level suspend routine. */
extern int acpi_suspend_lowlevel(void); extern int (*acpi_suspend_lowlevel)(void);
/* Physical address to resume after wakeup */ /* Physical address to resume after wakeup */
#define acpi_wakeup_address ((unsigned long)(real_mode_header->wakeup_start)) #define acpi_wakeup_address ((unsigned long)(real_mode_header->wakeup_start))

7
arch/x86/kernel/acpi/boot.c
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@ -44,6 +44,7 @@
#include <asm/mpspec.h> #include <asm/mpspec.h>
#include <asm/smp.h> #include <asm/smp.h>
#include "sleep.h" /* To include x86_acpi_suspend_lowlevel */
static int __initdata acpi_force = 0; static int __initdata acpi_force = 0;
u32 acpi_rsdt_forced; u32 acpi_rsdt_forced;
int acpi_disabled; int acpi_disabled;
@ -559,6 +560,12 @@ static int acpi_register_gsi_ioapic(struct device *dev, u32 gsi,
int (*__acpi_register_gsi)(struct device *dev, u32 gsi, int (*__acpi_register_gsi)(struct device *dev, u32 gsi,
int trigger, int polarity) = acpi_register_gsi_pic; 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) * success: return IRQ number (>=0)
* failure: return < 0 * failure: return < 0

4
arch/x86/kernel/acpi/sleep.c
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@ -26,12 +26,12 @@ static char temp_stack[4096];
#endif #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 * Create an identity mapped page table and copy the wakeup routine to
* low memory. * low memory.
*/ */
int acpi_suspend_lowlevel(void) int x86_acpi_suspend_lowlevel(void)
{ {
struct wakeup_header *header = struct wakeup_header *header =
(struct wakeup_header *) __va(real_mode_header->wakeup_header); (struct wakeup_header *) __va(real_mode_header->wakeup_header);

2
arch/x86/kernel/acpi/sleep.h
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@ -15,3 +15,5 @@ extern unsigned long acpi_copy_wakeup_routine(unsigned long);
extern void wakeup_long64(void); extern void wakeup_long64(void);
extern void do_suspend_lowlevel(void); extern void do_suspend_lowlevel(void);
extern int x86_acpi_suspend_lowlevel(void);

2
drivers/acpi/sleep.c
View File

@ -494,6 +494,8 @@ static int acpi_suspend_enter(suspend_state_t pm_state)
break; break;
case ACPI_STATE_S3: case ACPI_STATE_S3:
if (!acpi_suspend_lowlevel)
return -ENOSYS;
error = acpi_suspend_lowlevel(); error = acpi_suspend_lowlevel();
if (error) if (error)
return error; return error;