efi/arm64: use UEFI for system reset and poweroff
authorArd Biesheuvel <ard.biesheuvel@linaro.org>
Fri, 6 Mar 2015 14:49:24 +0000 (15:49 +0100)
committerCatalin Marinas <catalin.marinas@arm.com>
Sat, 14 Mar 2015 11:00:18 +0000 (11:00 +0000)
If UEFI Runtime Services are available, they are preferred over direct
PSCI calls or other methods to reset the system.

For the reset case, we need to hook into machine_restart(), as the
arm_pm_restart function pointer may be overwritten by modules.

Tested-by: Mark Rutland <mark.rutland@arm.com>
Reviewed-by: Mark Rutland <mark.rutland@arm.com>
Reviewed-by: Matt Fleming <matt.fleming@intel.com>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
arch/arm64/kernel/efi.c
arch/arm64/kernel/process.c

index b42c7b4..2b8d701 100644 (file)
@@ -354,3 +354,12 @@ void efi_virtmap_unload(void)
        efi_set_pgd(current->active_mm);
        preempt_enable();
 }
+
+/*
+ * UpdateCapsule() depends on the system being shutdown via
+ * ResetSystem().
+ */
+bool efi_poweroff_required(void)
+{
+       return efi_enabled(EFI_RUNTIME_SERVICES);
+}
index fde9923..c6b1f3b 100644 (file)
@@ -21,6 +21,7 @@
 #include <stdarg.h>
 
 #include <linux/compat.h>
+#include <linux/efi.h>
 #include <linux/export.h>
 #include <linux/sched.h>
 #include <linux/kernel.h>
@@ -150,6 +151,13 @@ void machine_restart(char *cmd)
        local_irq_disable();
        smp_send_stop();
 
+       /*
+        * UpdateCapsule() depends on the system being reset via
+        * ResetSystem().
+        */
+       if (efi_enabled(EFI_RUNTIME_SERVICES))
+               efi_reboot(reboot_mode, NULL);
+
        /* Now call the architecture specific reboot code. */
        if (arm_pm_restart)
                arm_pm_restart(reboot_mode, cmd);