From: Sumit Garg <sumit.garg@oss.qualcomm.com>
UEFI specification provides support for EfiResetPlatformSpecific reset
type as follows:
"
ResetSystem:
Calling this interface with ResetType of EfiResetPlatformSpecific
causes a system-wide reset. The exact type of the reset is defined
by the EFI_GUID that follows the Null-terminated Unicode string passed
into ResetData. If the platform does not recognize the EFI_GUID in
ResetData the platform must pick a supported reset type to perform.
The platform may optionally log the parameters from any non-normal
reset that occurs.
"
Lets use the ResetData to pass the platform specific reboot command
issued and leave it's interpretation to UEFI implementation following
the specification.
Signed-off-by: Sumit Garg <sumit.garg@oss.qualcomm.com>
---
drivers/firmware/efi/reboot.c | 25 +++++++++++++++----------
include/linux/efi.h | 5 +++--
2 files changed, 18 insertions(+), 12 deletions(-)
diff --git a/drivers/firmware/efi/reboot.c b/drivers/firmware/efi/reboot.c
index ceae84c19d22..23a2fc68e9c9 100644
--- a/drivers/firmware/efi/reboot.c
+++ b/drivers/firmware/efi/reboot.c
@@ -10,7 +10,7 @@ static struct sys_off_handler *efi_sys_off_handler;
int efi_reboot_quirk_mode = -1;
-void efi_reboot(enum reboot_mode reboot_mode, const char *__unused)
+void efi_reboot(enum reboot_mode reboot_mode, const char *data)
{
const char *str[] = { "cold", "warm", "shutdown", "platform" };
int efi_mode, cap_reset_mode;
@@ -18,14 +18,18 @@ void efi_reboot(enum reboot_mode reboot_mode, const char *__unused)
if (!efi_rt_services_supported(EFI_RT_SUPPORTED_RESET_SYSTEM))
return;
- switch (reboot_mode) {
- case REBOOT_WARM:
- case REBOOT_SOFT:
- efi_mode = EFI_RESET_WARM;
- break;
- default:
- efi_mode = EFI_RESET_COLD;
- break;
+ if (data) {
+ efi_mode = EFI_RESET_PLATFORM_SPECIFIC;
+ } else {
+ switch (reboot_mode) {
+ case REBOOT_WARM:
+ case REBOOT_SOFT:
+ efi_mode = EFI_RESET_WARM;
+ break;
+ default:
+ efi_mode = EFI_RESET_COLD;
+ break;
+ }
}
/*
@@ -43,7 +47,8 @@ void efi_reboot(enum reboot_mode reboot_mode, const char *__unused)
efi_mode = cap_reset_mode;
}
- efi.reset_system(efi_mode, EFI_SUCCESS, 0, NULL);
+ efi.reset_system(efi_mode, EFI_SUCCESS, sizeof(data),
+ (efi_char16_t *)data);
}
bool __weak efi_poweroff_required(void)
diff --git a/include/linux/efi.h b/include/linux/efi.h
index a98cc39e7aaa..5324db1518b6 100644
--- a/include/linux/efi.h
+++ b/include/linux/efi.h
@@ -256,6 +256,7 @@ typedef union efi_boot_services efi_boot_services_t;
#define EFI_RESET_COLD 0
#define EFI_RESET_WARM 1
#define EFI_RESET_SHUTDOWN 2
+#define EFI_RESET_PLATFORM_SPECIFIC 3
/*
* EFI Runtime Services table
@@ -874,7 +875,7 @@ static inline bool efi_enabled(int feature)
{
return test_bit(feature, &efi.flags) != 0;
}
-extern void efi_reboot(enum reboot_mode reboot_mode, const char *__unused);
+extern void efi_reboot(enum reboot_mode reboot_mode, const char *data);
bool __pure __efi_soft_reserve_enabled(void);
@@ -895,7 +896,7 @@ static inline bool efi_enabled(int feature)
return false;
}
static inline void
-efi_reboot(enum reboot_mode reboot_mode, const char *__unused) {}
+efi_reboot(enum reboot_mode reboot_mode, const char *data) {}
static inline bool efi_soft_reserve_enabled(void)
{
--
2.48.1On Fri, 14 Nov 2025 at 09:51, Sumit Garg <sumit.garg@kernel.org> wrote:
>
> From: Sumit Garg <sumit.garg@oss.qualcomm.com>
>
> UEFI specification provides support for EfiResetPlatformSpecific reset
> type as follows:
>
> "
> ResetSystem:
>
> Calling this interface with ResetType of EfiResetPlatformSpecific
> causes a system-wide reset. The exact type of the reset is defined
> by the EFI_GUID that follows the Null-terminated Unicode string passed
> into ResetData. If the platform does not recognize the EFI_GUID in
> ResetData the platform must pick a supported reset type to perform.
> The platform may optionally log the parameters from any non-normal
> reset that occurs.
> "
>
> Lets use the ResetData to pass the platform specific reboot command
> issued and leave it's interpretation to UEFI implementation following
> the specification.
>
> Signed-off-by: Sumit Garg <sumit.garg@oss.qualcomm.com>
> ---
> drivers/firmware/efi/reboot.c | 25 +++++++++++++++----------
> include/linux/efi.h | 5 +++--
> 2 files changed, 18 insertions(+), 12 deletions(-)
>
> diff --git a/drivers/firmware/efi/reboot.c b/drivers/firmware/efi/reboot.c
> index ceae84c19d22..23a2fc68e9c9 100644
> --- a/drivers/firmware/efi/reboot.c
> +++ b/drivers/firmware/efi/reboot.c
> @@ -10,7 +10,7 @@ static struct sys_off_handler *efi_sys_off_handler;
>
> int efi_reboot_quirk_mode = -1;
>
> -void efi_reboot(enum reboot_mode reboot_mode, const char *__unused)
> +void efi_reboot(enum reboot_mode reboot_mode, const char *data)
> {
> const char *str[] = { "cold", "warm", "shutdown", "platform" };
> int efi_mode, cap_reset_mode;
> @@ -18,14 +18,18 @@ void efi_reboot(enum reboot_mode reboot_mode, const char *__unused)
> if (!efi_rt_services_supported(EFI_RT_SUPPORTED_RESET_SYSTEM))
> return;
>
> - switch (reboot_mode) {
> - case REBOOT_WARM:
> - case REBOOT_SOFT:
> - efi_mode = EFI_RESET_WARM;
> - break;
> - default:
> - efi_mode = EFI_RESET_COLD;
> - break;
> + if (data) {
> + efi_mode = EFI_RESET_PLATFORM_SPECIFIC;
> + } else {
> + switch (reboot_mode) {
> + case REBOOT_WARM:
> + case REBOOT_SOFT:
> + efi_mode = EFI_RESET_WARM;
> + break;
> + default:
> + efi_mode = EFI_RESET_COLD;
> + break;
> + }
> }
>
> /*
> @@ -43,7 +47,8 @@ void efi_reboot(enum reboot_mode reboot_mode, const char *__unused)
> efi_mode = cap_reset_mode;
> }
>
> - efi.reset_system(efi_mode, EFI_SUCCESS, 0, NULL);
> + efi.reset_system(efi_mode, EFI_SUCCESS, sizeof(data),
You cannot use sizeof() here - it will return the size of a pointer to
const char.
> + (efi_char16_t *)data);
> }
>
> bool __weak efi_poweroff_required(void)
> diff --git a/include/linux/efi.h b/include/linux/efi.h
> index a98cc39e7aaa..5324db1518b6 100644
> --- a/include/linux/efi.h
> +++ b/include/linux/efi.h
> @@ -256,6 +256,7 @@ typedef union efi_boot_services efi_boot_services_t;
> #define EFI_RESET_COLD 0
> #define EFI_RESET_WARM 1
> #define EFI_RESET_SHUTDOWN 2
> +#define EFI_RESET_PLATFORM_SPECIFIC 3
>
> /*
> * EFI Runtime Services table
> @@ -874,7 +875,7 @@ static inline bool efi_enabled(int feature)
> {
> return test_bit(feature, &efi.flags) != 0;
> }
> -extern void efi_reboot(enum reboot_mode reboot_mode, const char *__unused);
> +extern void efi_reboot(enum reboot_mode reboot_mode, const char *data);
>
> bool __pure __efi_soft_reserve_enabled(void);
>
> @@ -895,7 +896,7 @@ static inline bool efi_enabled(int feature)
> return false;
> }
> static inline void
> -efi_reboot(enum reboot_mode reboot_mode, const char *__unused) {}
> +efi_reboot(enum reboot_mode reboot_mode, const char *data) {}
>
> static inline bool efi_soft_reserve_enabled(void)
> {
> --
> 2.48.1
>
On 11/14/25 9:50 AM, Sumit Garg wrote: > From: Sumit Garg <sumit.garg@oss.qualcomm.com> > > UEFI specification provides support for EfiResetPlatformSpecific reset > type as follows: > > " > ResetSystem: > > Calling this interface with ResetType of EfiResetPlatformSpecific > causes a system-wide reset. The exact type of the reset is defined > by the EFI_GUID that follows the Null-terminated Unicode string passed > into ResetData. If the platform does not recognize the EFI_GUID in > ResetData the platform must pick a supported reset type to perform. > The platform may optionally log the parameters from any non-normal > reset that occurs. > " > > Lets use the ResetData to pass the platform specific reboot command > issued and leave it's interpretation to UEFI implementation following > the specification. > > Signed-off-by: Sumit Garg <sumit.garg@oss.qualcomm.com> > --- Reviewed-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com> Konrad
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