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riscv: Restart via EFI runtime services when available

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Firmware-preferred reset and EFI capsule update support requires reset
via EFI runtime services rather than direction M-mode firmware invocation
via SBI. Unlike poweroff, restart mechanism is directly controlled from
machine_restart function though.

Prefer the EFI runtime ResetSystem() service for restart when UEFI
runtime services are available.

Signed-off-by: Atish Patra <atishp@meta.com>
Reviewed-by: Sunil V L <sunilvl@oss.qualcomm.com>
Link: https://patch.msgid.link/20260615-efi_reset_shutdown-v1-2-9414edcbbab0@meta.com
Signed-off-by: Paul Walmsley <pjw@kernel.org>
This commit is contained in:
Atish Patra 2026-08-07 19:24:29 -06:00 committed by Paul Walmsley
parent d8d0fb556e
commit c888e324b2
1 changed files with 7 additions and 0 deletions
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7
arch/riscv/kernel/reset.c
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@ -3,6 +3,7 @@
* Copyright (C) 2012 Regents of the University of California
*/
#include <linux/efi.h>
#include <linux/reboot.h>
#include <linux/pm.h>
@ -17,6 +18,12 @@ EXPORT_SYMBOL(pm_power_off);
void machine_restart(char *cmd)
{
/*
* UpdateCapsule() depends on the system being reset via ResetSystem().
*/
if (efi_enabled(EFI_RUNTIME_SERVICES))
efi_reboot(reboot_mode, NULL);
do_kernel_restart(cmd);
while (1);
}