[PATCH] cleanup: Replace tboot specific calls in ACPI with function call.

[PATCH] cleanup: Replace tboot specific calls in ACPI with function call.

[Konrad Rzeszutek Wilk]

Please consider these two patches for v3.4. I've posted these in the past and
they don't differ any from the previous postings. The majority of changes
has been suggested by Rafael Wysocki and Joseph Cihula has ACK-ed the patches.

The net gain of these patches is to remove the 'tboot' call within the ACPI core
framwork and replace it with an function call where the platform drivers can
register if they choose to. This makes it possible for platforms such as ARM, IA64
to choose whether they want to make a call to something similar to tboot or not.
If nothing is registered the call ends up being a nop.


 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(-)


Konrad Rzeszutek Wilk (1):
      tboot: Add return values for tboot_sleep

Tang Liang (1):
      x86, acpi, tboot: Have a ACPI os prepare sleep instead of calling tboot_sleep.

[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

[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;
 }
 
-- 
1.7.7.5

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);
> 

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

[Rafael J. Wysocki]

On Saturday, March 10, 2012, Konrad Rzeszutek Wilk wrote:
> . 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>

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

> ---
>  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;
>  }
>  
> 

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 2/2] tboot: Add return values for 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; Konrad Rzeszutek Wilk
> Subject: [PATCH 2/2] tboot: Add return values for tboot_sleep
> 
> . 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;
>  }
> 
> --
> 1.7.7.5

[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