[PATCH] arm64: support reboot and power off via EFI runtime

[Rob Herring]

On Tue, Jun 17, 2014 at 11:45 AM, Mark Salter <msalter at redhat.com> wrote:
> Add handlers for arm_pm_resestart and pm_power_off which use EFI

typo.

> runtime services ResetSystem call to perform the functions. These
> handlers are only installed if no handler currently exists. This
> allows PSCI to take priority over EFI for these functions.
>
> Signed-off-by: Mark Salter <msalter at redhat.com>
> ---
>  arch/arm64/kernel/efi.c | 40 ++++++++++++++++++++++++++++++++++++++++

Where's the arm32 version? Surely this could be shared with all
arches. pm_power_off is at least architecturally independent. We
should do the same for restart/reboot. I'm not saying do that now, but
at least put it in the right place for that to happen.

Rob

>  1 file changed, 40 insertions(+)
>
> diff --git a/arch/arm64/kernel/efi.c b/arch/arm64/kernel/efi.c
> index 14db1f6..e8c0476 100644
> --- a/arch/arm64/kernel/efi.c
> +++ b/arch/arm64/kernel/efi.c
> @@ -19,11 +19,14 @@
>  #include <linux/of_fdt.h>
>  #include <linux/sched.h>
>  #include <linux/slab.h>
> +#include <linux/reboot.h>
> +#include <linux/pm.h>
>
>  #include <asm/cacheflush.h>
>  #include <asm/efi.h>
>  #include <asm/tlbflush.h>
>  #include <asm/mmu_context.h>
> +#include <asm/system_misc.h>
>
>  struct efi_memory_map memmap;
>
> @@ -467,3 +470,40 @@ static int __init arm64_enter_virtual_mode(void)
>         return 0;
>  }
>  early_initcall(arm64_enter_virtual_mode);
> +
> +static void efi_restart(enum reboot_mode reboot_mode, const char *cmd)
> +{
> +       int efi_mode;
> +
> +       switch (reboot_mode) {
> +       case REBOOT_WARM:
> +       case REBOOT_SOFT:
> +               efi_mode = EFI_RESET_WARM;
> +               break;
> +       default:
> +               efi_mode = EFI_RESET_COLD;
> +               break;
> +       }
> +       efi.reset_system(efi_mode, 0, 0, NULL);
> +}
> +
> +static void efi_power_off(void)
> +{
> +       efi.reset_system(EFI_RESET_SHUTDOWN, 0, 0, NULL);
> +}
> +
> +static int __init setup_efi_reset(void)
> +{
> +       if (efi_enabled(EFI_RUNTIME_SERVICES)) {
> +               /*
> +                * If something (psci, etc) hasn't already registered
> +                * a handler, use EFI.
> +                */
> +               if (arm_pm_restart == NULL)
> +                       arm_pm_restart = efi_restart;
> +               if (pm_power_off == NULL)
> +                       pm_power_off = efi_power_off;
> +       }
> +       return 0;
> +}
> +pure_initcall(setup_efi_reset);
> --
> 1.9.0
>
>
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