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Commit 09f98a82 authored by Tang Liang's avatar Tang Liang Committed by Konrad Rzeszutek Wilk
Browse files

x86, acpi, tboot: Have a ACPI os prepare sleep instead of calling tboot_sleep. 



The ACPI suspend path makes a call to tboot_sleep right before
it writes the PM1A, PM1B values. We replace the direct call to
tboot via an registration callback similar to __acpi_register_gsi.

CC: Len Brown <len.brown@intel.com>
Acked-by: default avatarJoseph Cihula <joseph.cihula@intel.com>
Acked-by: default avatarRafael J. Wysocki <rjw@sisk.pl>
[v1: Added __attribute__ ((unused))]
[v2: Introduced a wrapper instead of changing tboot_sleep return values]
[v3: Added return value AE_CTRL_SKIP for acpi_os_sleep_prepare]
Signed-off-by: default avatarTang Liang <liang.tang@oracle.com>
[v1: Fix compile issues on IA64 and PPC64]
[v2: Fix where __acpi_os_prepare_sleep==NULL and did not go in sleep properly]
Signed-off-by: default avatarKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>
parent 805a6af8

arch/x86/kernel/tboot.c

+8 −0
Original line number Diff line number Diff line
@@ -297,6 +297,12 @@ void tboot_sleep(u8 sleep_state, u32 pm1a_control, u32 pm1b_control) 


	tboot_shutdown(acpi_shutdown_map[sleep_state]);

}

static int tboot_sleep_wrapper(u8 sleep_state, u32 pm1a_control,

			       u32 pm1b_control)

{

	tboot_sleep(sleep_state, pm1a_control, pm1b_control);

	return 0;

}



static atomic_t ap_wfs_count;
@@ -345,6 +351,8 @@ static __init int tboot_late_init(void) 


	atomic_set(&ap_wfs_count, 0);

	register_hotcpu_notifier(&tboot_cpu_notifier);



	acpi_os_set_prepare_sleep(&tboot_sleep_wrapper);

	return 0;

}

drivers/acpi/acpica/hwsleep.c

+7 −3
Original line number Diff line number Diff line
@@ -43,9 +43,9 @@ 
 */



#include <acpi/acpi.h>

#include <linux/acpi.h>

#include "accommon.h"

#include "actables.h"

#include <linux/tboot.h>

#include <linux/module.h>



#define _COMPONENT          ACPI_HARDWARE
@@ -344,8 +344,12 @@ acpi_status asmlinkage acpi_enter_sleep_state(u8 sleep_state) 


	ACPI_FLUSH_CPU_CACHE();



	tboot_sleep(sleep_state, pm1a_control, pm1b_control);



	status = acpi_os_prepare_sleep(sleep_state, pm1a_control,

				       pm1b_control);

	if (ACPI_SKIP(status))

		return_ACPI_STATUS(AE_OK);

	if (ACPI_FAILURE(status))

		return_ACPI_STATUS(status);

	/* Write #2: Write both SLP_TYP + SLP_EN */



	status = acpi_hw_write_pm1_control(pm1a_control, pm1b_control);

drivers/acpi/osl.c

+24 −0
Original line number Diff line number Diff line
@@ -76,6 +76,9 @@ EXPORT_SYMBOL(acpi_in_debugger); 
extern char line_buf[80];

#endif				/*ENABLE_DEBUGGER */



static int (*__acpi_os_prepare_sleep)(u8 sleep_state, u32 pm1a_ctrl,

				      u32 pm1b_ctrl);



static acpi_osd_handler acpi_irq_handler;

static void *acpi_irq_context;

static struct workqueue_struct *kacpid_wq;
@@ -1659,3 +1662,24 @@ acpi_status acpi_os_terminate(void) 


	return AE_OK;

}



acpi_status acpi_os_prepare_sleep(u8 sleep_state, u32 pm1a_control,

				  u32 pm1b_control)

{

	int rc = 0;

	if (__acpi_os_prepare_sleep)

		rc = __acpi_os_prepare_sleep(sleep_state,

					     pm1a_control, pm1b_control);

	if (rc < 0)

		return AE_ERROR;

	else if (rc > 0)

		return AE_CTRL_SKIP;



	return AE_OK;

}



void acpi_os_set_prepare_sleep(int (*func)(u8 sleep_state,

			       u32 pm1a_ctrl, u32 pm1b_ctrl))

{

	__acpi_os_prepare_sleep = func;

}

include/acpi/acexcep.h

+1 −0
Original line number Diff line number Diff line
@@ -57,6 +57,7 @@ 
#define ACPI_SUCCESS(a)                 (!(a))

#define ACPI_FAILURE(a)                 (a)



#define ACPI_SKIP(a)                    (a == AE_CTRL_SKIP)

#define AE_OK                           (acpi_status) 0x0000



/*

include/linux/acpi.h

+10 −0
Original line number Diff line number Diff line
@@ -359,4 +359,14 @@ static inline int suspend_nvs_register(unsigned long a, unsigned long b) 
}

#endif



#ifdef CONFIG_ACPI

void acpi_os_set_prepare_sleep(int (*func)(u8 sleep_state,

			       u32 pm1a_ctrl,  u32 pm1b_ctrl));



acpi_status acpi_os_prepare_sleep(u8 sleep_state,

				  u32 pm1a_control, u32 pm1b_control);

#else

#define acpi_os_set_prepare_sleep(func, pm1a_ctrl, pm1b_ctrl) do { } while (0)

#endif



#endif	/*_LINUX_ACPI_H*/