[Xen-devel] [PATCH v7 1/3] x86/acpi: Introduce acpi_os_prepare_extended_sleep callback for extended sleep path

[Ben Guthro <benjamin.guthro@xxxxxxxxxx>]

Like acpi_os_prepare_sleep, register a callback for use in systems like
tboot, and xen, which have system specific requirements outside of acpica.
This mirrors the functionality in acpi_os_prepare_sleep(), called from
acpi_hw_sleep()

Signed-off-by: Ben Guthro <benjamin.guthro@xxxxxxxxxx>
---
 drivers/acpi/acpica/hwesleep.c |    9 +++++++++
 drivers/acpi/osl.c             |   24 ++++++++++++++++++++++++
 include/linux/acpi.h           |    7 +++++++
 3 files changed, 40 insertions(+)

diff --git a/drivers/acpi/acpica/hwesleep.c b/drivers/acpi/acpica/hwesleep.c
index 5e5f762..4140768 100644
--- a/drivers/acpi/acpica/hwesleep.c
+++ b/drivers/acpi/acpica/hwesleep.c
@@ -43,6 +43,7 @@
  */
 
 #include <acpi/acpi.h>
+#include <linux/acpi.h>
 #include "accommon.h"
 
 #define _COMPONENT          ACPI_HARDWARE
@@ -128,6 +129,14 @@ acpi_status acpi_hw_extended_sleep(u8 sleep_state)
 
        ACPI_FLUSH_CPU_CACHE();
 
+       status = acpi_os_prepare_extended_sleep(sleep_state,
+                                               acpi_gbl_sleep_type_a,
+                                               acpi_gbl_sleep_type_b);
+       if (ACPI_SKIP(status))
+               return_ACPI_STATUS(AE_OK);
+       if (ACPI_FAILURE(status))
+               return_ACPI_STATUS(status);
+
        /*
         * Set the SLP_TYP and SLP_EN bits.
         *
diff --git a/drivers/acpi/osl.c b/drivers/acpi/osl.c
index 6ab2c35..a934950 100644
--- a/drivers/acpi/osl.c
+++ b/drivers/acpi/osl.c
@@ -79,6 +79,8 @@ extern char line_buf[80];
 
 static int (*__acpi_os_prepare_sleep)(u8 sleep_state, u32 pm1a_ctrl,
                                      u32 pm1b_ctrl);
+static int (*__acpi_os_prepare_extended_sleep)(u8 sleep_state, u32 val_a,
+                                     u32 val_b);
 
 static acpi_osd_handler acpi_irq_handler;
 static void *acpi_irq_context;
@@ -1779,6 +1781,28 @@ void acpi_os_set_prepare_sleep(int (*func)(u8 
sleep_state,
        __acpi_os_prepare_sleep = func;
 }
 
+acpi_status acpi_os_prepare_extended_sleep(u8 sleep_state, u32 val_a,
+                                 u32 val_b)
+{
+       int rc = 0;
+       if (__acpi_os_prepare_extended_sleep)
+               rc = __acpi_os_prepare_extended_sleep(sleep_state,
+                                            val_a, val_b);
+       if (rc < 0)
+               return AE_ERROR;
+       else if (rc > 0)
+               return AE_CTRL_SKIP;
+
+       return AE_OK;
+}
+
+void acpi_os_set_prepare_extended_sleep(int (*func)(u8 sleep_state,
+                              u32 val_a, u32 val_b))
+{
+       __acpi_os_prepare_extended_sleep = func;
+}
+
+
 void alloc_acpi_hp_work(acpi_handle handle, u32 type, void *context,
                        void (*func)(struct work_struct *work))
 {
diff --git a/include/linux/acpi.h b/include/linux/acpi.h
index 353ba25..a5db4ae 100644
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -481,6 +481,13 @@ void acpi_os_set_prepare_sleep(int (*func)(u8 sleep_state,
 
 acpi_status acpi_os_prepare_sleep(u8 sleep_state,
                                  u32 pm1a_control, u32 pm1b_control);
+
+void acpi_os_set_prepare_extended_sleep(int (*func)(u8 sleep_state,
+                                       u32 val_a,  u32 val_b));
+
+acpi_status acpi_os_prepare_extended_sleep(u8 sleep_state,
+                                          u32 val_a, u32 val_b);
+
 #ifdef CONFIG_X86
 void arch_reserve_mem_area(acpi_physical_address addr, size_t size);
 #else
-- 
1.7.9.5


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