[Xen-devel] [PATCH 2/8] x86, acpi, tboot: Have a ACPI sleep override instead of calling tboot_sleep.

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

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: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
CC: "H. Peter Anvin" <hpa@xxxxxxxxx>
CC: x86@xxxxxxxxxx
CC: Len Brown <len.brown@xxxxxxxxx>
CC: Joseph Cihula <joseph.cihula@xxxxxxxxx>
CC: Shane Wang <shane.wang@xxxxxxxxx>
CC: xen-devel@xxxxxxxxxxxxxxxxxxx
CC: linux-pm@xxxxxxxxxxxxxxxxxxxxxxxxxx
CC: tboot-devel@xxxxxxxxxxxxxxxxxxxxx
CC: linux-acpi@xxxxxxxxxxxxxxx
[v1: Added __attribute__ ((unused))]
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
---
 arch/x86/include/asm/acpi.h   |    4 ++++
 arch/x86/kernel/acpi/boot.c   |    4 ++++
 arch/x86/kernel/tboot.c       |   14 ++++++++++----
 drivers/acpi/acpica/hwsleep.c |   12 ++++++++++--
 include/linux/tboot.h         |    3 ++-
 5 files changed, 30 insertions(+), 7 deletions(-)

diff --git a/arch/x86/include/asm/acpi.h b/arch/x86/include/asm/acpi.h
index 610001d..0a46696 100644
--- a/arch/x86/include/asm/acpi.h
+++ b/arch/x86/include/asm/acpi.h
@@ -98,6 +98,10 @@ void acpi_pic_sci_set_trigger(unsigned int, u16);
 extern int (*__acpi_register_gsi)(struct device *dev, u32 gsi,
                                  int trigger, int polarity);
 
+extern int (*__acpi_override_sleep)(u8 sleep_state, u32 pm1a_ctrl,
+                                   u32 pm1b_ctrl, bool *skip_rest) \
+                                   __attribute__ ((unused));
+
 static inline void disable_acpi(void)
 {
        acpi_disabled = 1;
diff --git a/arch/x86/kernel/acpi/boot.c b/arch/x86/kernel/acpi/boot.c
index 4558f0d..7f30806 100644
--- a/arch/x86/kernel/acpi/boot.c
+++ b/arch/x86/kernel/acpi/boot.c
@@ -552,6 +552,10 @@ static int acpi_register_gsi_ioapic(struct device *dev, 
u32 gsi,
 int (*__acpi_register_gsi)(struct device *dev, u32 gsi,
                           int trigger, int polarity) = acpi_register_gsi_pic;
 
+int (*__acpi_override_sleep)(u8 sleep_state, u32 pm1a_ctrl,
+                            u32 pm1b_ctrl, bool *skip_rest) \
+                          __attribute__ ((unused)) = NULL;
+
 /*
  * success: return IRQ number (>=0)
  * failure: return < 0
diff --git a/arch/x86/kernel/tboot.c b/arch/x86/kernel/tboot.c
index e07a2fc..a6c0a30 100644
--- a/arch/x86/kernel/tboot.c
+++ b/arch/x86/kernel/tboot.c
@@ -42,7 +42,7 @@
 #include <asm/setup.h>
 #include <asm/e820.h>
 #include <asm/io.h>
-
+#include <linux/acpi.h>
 #include "acpi/realmode/wakeup.h"
 
 /* Global pointer to shared data; NULL means no measured launch. */
@@ -271,7 +271,9 @@ 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)
+
+int tboot_sleep(u8 sleep_state, u32 pm1a_control, u32 pm1b_control,
+               bool *skip_rest)
 {
        static u32 acpi_shutdown_map[ACPI_S_STATE_COUNT] = {
                /* S0,1,2: */ -1, -1, -1,
@@ -280,7 +282,7 @@ void tboot_sleep(u8 sleep_state, u32 pm1a_control, u32 
pm1b_control)
                /* S5: */ TB_SHUTDOWN_S5 };
 
        if (!tboot_enabled())
-               return;
+               return AE_OK;
 
        tboot_copy_fadt(&acpi_gbl_FADT);
        tboot->acpi_sinfo.pm1a_cnt_val = pm1a_control;
@@ -291,10 +293,12 @@ 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 AE_ERROR;
        }
 
        tboot_shutdown(acpi_shutdown_map[sleep_state]);
+
+       return AE_OK;
 }
 
 static atomic_t ap_wfs_count;
@@ -344,6 +348,8 @@ static __init int tboot_late_init(void)
 
        atomic_set(&ap_wfs_count, 0);
        register_hotcpu_notifier(&tboot_cpu_notifier);
+
+       __acpi_override_sleep = tboot_sleep;
        return 0;
 }
 
diff --git a/drivers/acpi/acpica/hwsleep.c b/drivers/acpi/acpica/hwsleep.c
index 2ac28bb..31d1198 100644
--- a/drivers/acpi/acpica/hwsleep.c
+++ b/drivers/acpi/acpica/hwsleep.c
@@ -45,7 +45,6 @@
 #include <acpi/acpi.h>
 #include "accommon.h"
 #include "actables.h"
-#include <linux/tboot.h>
 
 #define _COMPONENT          ACPI_HARDWARE
 ACPI_MODULE_NAME("hwsleep")
@@ -343,8 +342,17 @@ acpi_status asmlinkage acpi_enter_sleep_state(u8 
sleep_state)
 
        ACPI_FLUSH_CPU_CACHE();
 
-       tboot_sleep(sleep_state, pm1a_control, pm1b_control);
+       if (__acpi_override_sleep) {
+               bool skip_rest = false;
 
+               status = __acpi_override_sleep(sleep_state, pm1a_control,
+                                              pm1b_control, &skip_rest);
+
+               if (ACPI_FAILURE(status))
+                       return_ACPI_STATUS(status);
+               if (skip_rest)
+                       return_ACPI_STATUS(AE_OK);
+       }
        /* Write #2: Write both SLP_TYP + SLP_EN */
 
        status = acpi_hw_write_pm1_control(pm1a_control, pm1b_control);
diff --git a/include/linux/tboot.h b/include/linux/tboot.h
index 1dba6ee..1216698 100644
--- a/include/linux/tboot.h
+++ b/include/linux/tboot.h
@@ -143,7 +143,8 @@ 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 int tboot_sleep(u8 sleep_state, u32 pm1a_control, u32 pm1b_control,
+                      bool *skip_rest)  __attribute__ ((unused));
 extern struct acpi_table_header *tboot_get_dmar_table(
                                      struct acpi_table_header *dmar_tbl);
 extern int tboot_force_iommu(void);
-- 
1.7.4.1


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