[PATCH] cleanups in ACPI - removing tboot_ calls for 3.4 (v1)

[PATCH] cleanups in ACPI - removing tboot_ calls for 3.4 (v1)

[Konrad Rzeszutek Wilk]

I am not really sure if these patches should go through the ACPI or x86 tree.
I think they are more x86-ish related and earlier patches for tboot went through
tip.. Thoughts?

Theset two patches cleanup the ACPI code by removing the 'tboot_sleep'
function call within the ACPI call and instead use a function call.

The function call is set if Intel TXT is detected, otherwise we just skip over
and continue on in hwsleep.c.

Tested on AMD, Intel w/TXT and w/o TXT. Also compile tested on IA64 which has
some reference to tboot but does not use it.

The diff-stat:
 arch/x86/kernel/tboot.c       |    9 ++++++---
 drivers/acpi/acpica/hwsleep.c |   10 +++++++---
 drivers/acpi/osl.c            |   24 ++++++++++++++++++++++++
 include/acpi/acexcep.h        |    1 +
 include/linux/acpi.h          |   10 ++++++++++
 include/linux/tboot.h         |    1 -
 6 files changed, 48 insertions(+), 7 deletions(-)


The purpose of this cleanup is two-fold:
 1). Cleanup the call a bit - that 'tboot_sleep' in ACPICA, which is suppose to be
     OS-agnostic code looks odd.
 2). Piggy-back on the function call if running under Xen [https://lkml.org/lkml/2011/12/16/447].
     Those patches are still going through review, but the cleanup patches
     can be submitted as standalone.

Thanks! 

[PATCH 1/2] x86, acpi, tboot: Have a ACPI os prepare sleep instead of calling tboot_sleep.

[Konrad Rzeszutek Wilk]

From: Tang Liang <liang.tang@oracle.com>

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.

Suggested-by: Rafael J. Wysocki <rjw@sisk.pl>
CC: Len Brown <len.brown@intel.com>
Acked-by: Joseph Cihula <joseph.cihula@intel.com>
[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: Tang 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: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
---
 arch/x86/kernel/tboot.c       |    8 ++++++++
 drivers/acpi/acpica/hwsleep.c |   10 +++++++---
 drivers/acpi/osl.c            |   24 ++++++++++++++++++++++++
 include/acpi/acexcep.h        |    1 +
 include/linux/acpi.h          |   10 ++++++++++
 include/linux/tboot.h         |    1 -
 6 files changed, 50 insertions(+), 4 deletions(-)

diff --git a/arch/x86/kernel/tboot.c b/arch/x86/kernel/tboot.c
index e2410e2..1a4ab7d 100644
--- a/arch/x86/kernel/tboot.c
+++ b/arch/x86/kernel/tboot.c
@@ -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;
 }
 
diff --git a/drivers/acpi/acpica/hwsleep.c b/drivers/acpi/acpica/hwsleep.c
index d52da30..992359a 100644
--- a/drivers/acpi/acpica/hwsleep.c
+++ b/drivers/acpi/acpica/hwsleep.c
@@ -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);
diff --git a/drivers/acpi/osl.c b/drivers/acpi/osl.c
index f31c5c5..f3aae4b 100644
--- a/drivers/acpi/osl.c
+++ b/drivers/acpi/osl.c
@@ -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;
+}
diff --git a/include/acpi/acexcep.h b/include/acpi/acexcep.h
index 5b6c391..fa0d22c 100644
--- a/include/acpi/acexcep.h
+++ b/include/acpi/acexcep.h
@@ -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
 
 /*
diff --git a/include/linux/acpi.h b/include/linux/acpi.h
index 6001b4da..fccd017 100644
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -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*/
diff --git a/include/linux/tboot.h b/include/linux/tboot.h
index 1dba6ee..c75128b 100644
--- a/include/linux/tboot.h
+++ b/include/linux/tboot.h
@@ -143,7 +143,6 @@ static inline int tboot_enabled(void)
 
 extern void tboot_probe(void);
 extern void tboot_shutdown(u32 shutdown_type);
-extern void tboot_sleep(u8 sleep_state, u32 pm1a_control, u32 pm1b_control);
 extern struct acpi_table_header *tboot_get_dmar_table(
 				      struct acpi_table_header *dmar_tbl);
 extern int tboot_force_iommu(void);
-- 
1.7.7.4

[PATCH 2/2] tboot: Add return values for tboot_sleep

[Konrad Rzeszutek Wilk]

. as appropiately. As tboot_sleep now returns values.
remove tboot_sleep_wrapper.

Suggested-by: Rafael J. Wysocki <rjw@sisk.pl>
Acked-by: Joseph Cihula <joseph.cihula@intel.com>
[v1: Return -1/0/+1 instead of ACPI_xx values]
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
---
 arch/x86/kernel/tboot.c |   13 ++++---------
 1 files changed, 4 insertions(+), 9 deletions(-)

diff --git a/arch/x86/kernel/tboot.c b/arch/x86/kernel/tboot.c
index 1a4ab7d..6410744 100644
--- a/arch/x86/kernel/tboot.c
+++ b/arch/x86/kernel/tboot.c
@@ -272,7 +272,7 @@ static void tboot_copy_fadt(const struct acpi_table_fadt *fadt)
 		offsetof(struct acpi_table_facs, firmware_waking_vector);
 }
 
-void tboot_sleep(u8 sleep_state, u32 pm1a_control, u32 pm1b_control)
+static int tboot_sleep(u8 sleep_state, u32 pm1a_control, u32 pm1b_control)
 {
 	static u32 acpi_shutdown_map[ACPI_S_STATE_COUNT] = {
 		/* S0,1,2: */ -1, -1, -1,
@@ -281,7 +281,7 @@ void tboot_sleep(u8 sleep_state, u32 pm1a_control, u32 pm1b_control)
 		/* S5: */ TB_SHUTDOWN_S5 };
 
 	if (!tboot_enabled())
-		return;
+		return 0;
 
 	tboot_copy_fadt(&acpi_gbl_FADT);
 	tboot->acpi_sinfo.pm1a_cnt_val = pm1a_control;
@@ -292,15 +292,10 @@ void tboot_sleep(u8 sleep_state, u32 pm1a_control, u32 pm1b_control)
 	if (sleep_state >= ACPI_S_STATE_COUNT ||
 	    acpi_shutdown_map[sleep_state] == -1) {
 		pr_warning("unsupported sleep state 0x%x\n", sleep_state);
-		return;
+		return -1;
 	}
 
 	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;
 }
 
@@ -352,7 +347,7 @@ 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);
+	acpi_os_set_prepare_sleep(&tboot_sleep);
 	return 0;
 }
 
-- 
1.7.7.4

RE: [PATCH 1/2] x86, acpi, tboot: Have a ACPI os prepare sleep instead of calling tboot_sleep.

[Cihula, Joseph]

ACKed-by:  Joseph Cihula <joseph.cihula@intel.com>

> -----Original Message-----
> From: Konrad Rzeszutek Wilk [mailto:konrad.wilk@oracle.com]
> Sent: Saturday, March 10, 2012 10:52 AM
> To: linux-kernel@vger.kernel.org; x86@kernel.org; tglx@linutronix.de; mingo@redhat.com;
> hpa@zytor.com; linux-acpi@vger.kernel.org; lenb@kernel.org
> Cc: rjw@sisk.pl; Cihula, Joseph; Tang Liang; Brown, Len; Konrad Rzeszutek Wilk
> Subject: [PATCH 1/2] x86, acpi, tboot: Have a ACPI os prepare sleep instead of calling
> tboot_sleep.
> 
> From: Tang Liang <liang.tang@oracle.com>
> 
> 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: Joseph Cihula <joseph.cihula@intel.com>
> [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: Tang 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: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
> ---
>  arch/x86/kernel/tboot.c       |    8 ++++++++
>  drivers/acpi/acpica/hwsleep.c |   10 +++++++---
>  drivers/acpi/osl.c            |   24 ++++++++++++++++++++++++
>  include/acpi/acexcep.h        |    1 +
>  include/linux/acpi.h          |   10 ++++++++++
>  include/linux/tboot.h         |    1 -
>  6 files changed, 50 insertions(+), 4 deletions(-)
> 
> diff --git a/arch/x86/kernel/tboot.c b/arch/x86/kernel/tboot.c index e2410e2..1a4ab7d 100644
> --- a/arch/x86/kernel/tboot.c
> +++ b/arch/x86/kernel/tboot.c
> @@ -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;
>  }
> 
> diff --git a/drivers/acpi/acpica/hwsleep.c b/drivers/acpi/acpica/hwsleep.c index d52da30..992359a
> 100644
> --- a/drivers/acpi/acpica/hwsleep.c
> +++ b/drivers/acpi/acpica/hwsleep.c
> @@ -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); diff --git
> a/drivers/acpi/osl.c b/drivers/acpi/osl.c index f31c5c5..f3aae4b 100644
> --- a/drivers/acpi/osl.c
> +++ b/drivers/acpi/osl.c
> @@ -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;
> +}
> diff --git a/include/acpi/acexcep.h b/include/acpi/acexcep.h index 5b6c391..fa0d22c 100644
> --- a/include/acpi/acexcep.h
> +++ b/include/acpi/acexcep.h
> @@ -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
> 
>  /*
> diff --git a/include/linux/acpi.h b/include/linux/acpi.h index 6001b4da..fccd017 100644
> --- a/include/linux/acpi.h
> +++ b/include/linux/acpi.h
> @@ -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*/
> diff --git a/include/linux/tboot.h b/include/linux/tboot.h index 1dba6ee..c75128b 100644
> --- a/include/linux/tboot.h
> +++ b/include/linux/tboot.h
> @@ -143,7 +143,6 @@ static inline int tboot_enabled(void)
> 
>  extern void tboot_probe(void);
>  extern void tboot_shutdown(u32 shutdown_type); -extern void tboot_sleep(u8 sleep_state, u32
> pm1a_control, u32 pm1b_control);  extern struct acpi_table_header *tboot_get_dmar_table(
>  				      struct acpi_table_header *dmar_tbl);  extern int
> tboot_force_iommu(void);
> --
> 1.7.7.5

Re: [PATCH 1/2] x86, acpi, tboot: Have a ACPI os prepare sleep instead of calling tboot_sleep.

[Rafael J. Wysocki]

On Saturday, March 10, 2012, Konrad Rzeszutek Wilk wrote:
> From: Tang Liang <liang.tang@oracle.com>
> 
> 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: Joseph Cihula <joseph.cihula@intel.com>
> [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: Tang 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: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>

Acked-by: Rafael J. Wysocki <rjw@sisk.pl>

> ---
>  arch/x86/kernel/tboot.c       |    8 ++++++++
>  drivers/acpi/acpica/hwsleep.c |   10 +++++++---
>  drivers/acpi/osl.c            |   24 ++++++++++++++++++++++++
>  include/acpi/acexcep.h        |    1 +
>  include/linux/acpi.h          |   10 ++++++++++
>  include/linux/tboot.h         |    1 -
>  6 files changed, 50 insertions(+), 4 deletions(-)
> 
> diff --git a/arch/x86/kernel/tboot.c b/arch/x86/kernel/tboot.c
> index e2410e2..1a4ab7d 100644
> --- a/arch/x86/kernel/tboot.c
> +++ b/arch/x86/kernel/tboot.c
> @@ -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;
>  }
>  
> diff --git a/drivers/acpi/acpica/hwsleep.c b/drivers/acpi/acpica/hwsleep.c
> index d52da30..992359a 100644
> --- a/drivers/acpi/acpica/hwsleep.c
> +++ b/drivers/acpi/acpica/hwsleep.c
> @@ -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);
> diff --git a/drivers/acpi/osl.c b/drivers/acpi/osl.c
> index f31c5c5..f3aae4b 100644
> --- a/drivers/acpi/osl.c
> +++ b/drivers/acpi/osl.c
> @@ -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;
> +}
> diff --git a/include/acpi/acexcep.h b/include/acpi/acexcep.h
> index 5b6c391..fa0d22c 100644
> --- a/include/acpi/acexcep.h
> +++ b/include/acpi/acexcep.h
> @@ -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
>  
>  /*
> diff --git a/include/linux/acpi.h b/include/linux/acpi.h
> index 6001b4da..fccd017 100644
> --- a/include/linux/acpi.h
> +++ b/include/linux/acpi.h
> @@ -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*/
> diff --git a/include/linux/tboot.h b/include/linux/tboot.h
> index 1dba6ee..c75128b 100644
> --- a/include/linux/tboot.h
> +++ b/include/linux/tboot.h
> @@ -143,7 +143,6 @@ static inline int tboot_enabled(void)
>  
>  extern void tboot_probe(void);
>  extern void tboot_shutdown(u32 shutdown_type);
> -extern void tboot_sleep(u8 sleep_state, u32 pm1a_control, u32 pm1b_control);
>  extern struct acpi_table_header *tboot_get_dmar_table(
>  				      struct acpi_table_header *dmar_tbl);
>  extern int tboot_force_iommu(void);
> 

[PATCH 1/2] x86, acpi, tboot: Have a ACPI os prepare sleep instead of calling tboot_sleep.

[Konrad Rzeszutek Wilk]

From: Tang Liang <liang.tang@oracle.com>

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: Joseph Cihula <joseph.cihula@intel.com>
[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: Tang 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: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
---
 arch/x86/kernel/tboot.c       |    8 ++++++++
 drivers/acpi/acpica/hwsleep.c |   10 +++++++---
 drivers/acpi/osl.c            |   24 ++++++++++++++++++++++++
 include/acpi/acexcep.h        |    1 +
 include/linux/acpi.h          |   10 ++++++++++
 include/linux/tboot.h         |    1 -
 6 files changed, 50 insertions(+), 4 deletions(-)

diff --git a/arch/x86/kernel/tboot.c b/arch/x86/kernel/tboot.c
index e2410e2..1a4ab7d 100644
--- a/arch/x86/kernel/tboot.c
+++ b/arch/x86/kernel/tboot.c
@@ -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;
 }
 
diff --git a/drivers/acpi/acpica/hwsleep.c b/drivers/acpi/acpica/hwsleep.c
index d52da30..992359a 100644
--- a/drivers/acpi/acpica/hwsleep.c
+++ b/drivers/acpi/acpica/hwsleep.c
@@ -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);
diff --git a/drivers/acpi/osl.c b/drivers/acpi/osl.c
index f31c5c5..f3aae4b 100644
--- a/drivers/acpi/osl.c
+++ b/drivers/acpi/osl.c
@@ -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;
+}
diff --git a/include/acpi/acexcep.h b/include/acpi/acexcep.h
index 5b6c391..fa0d22c 100644
--- a/include/acpi/acexcep.h
+++ b/include/acpi/acexcep.h
@@ -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
 
 /*
diff --git a/include/linux/acpi.h b/include/linux/acpi.h
index 6001b4da..fccd017 100644
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -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*/
diff --git a/include/linux/tboot.h b/include/linux/tboot.h
index 1dba6ee..c75128b 100644
--- a/include/linux/tboot.h
+++ b/include/linux/tboot.h
@@ -143,7 +143,6 @@ static inline int tboot_enabled(void)
 
 extern void tboot_probe(void);
 extern void tboot_shutdown(u32 shutdown_type);
-extern void tboot_sleep(u8 sleep_state, u32 pm1a_control, u32 pm1b_control);
 extern struct acpi_table_header *tboot_get_dmar_table(
 				      struct acpi_table_header *dmar_tbl);
 extern int tboot_force_iommu(void);
-- 
1.7.7.5