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efi/arm64: use UEFI for system reset and poweroff

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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>
This commit is contained in:
Ard Biesheuvel 2015-03-06 15:49:24 +01:00 committed by Catalin Marinas
parent 285994a62c
commit 60c0d45a7f
2 changed files with 17 additions and 0 deletions
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9
arch/arm64/kernel/efi.c
View 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);
}

8
arch/arm64/kernel/process.c
View 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);