| Message ID | 20241125170758.518943-1-yeoreum.yun@arm.com |
|---|---|
| Headers | show |
| Series | small fixes when boot with acpi=force option | expand |
On Mon, 25 Nov 2024 at 18:08, Yeoreum Yun <yeoreum.yun@arm.com> wrote: > > when the acpi=force option is used, > the system does not fall back to the device tree (DT). > If it fails to initialize the ACPI table, it cannot proceed further. > In such cases, the system should invoke panic() to avoid contradicting > the user's explicit intent, as failing or > proceeding with unintended behavior would violate their wishes. > Calling panic() at this point does not achieve anything useful, though. Without ACPI tables or a DT, the only way to observe this panic message is by using earlycon= with an explicit MMIO address, and it might be better to limp on instead. Is there anything bad that might happen because of this, other than the user's wishes getting violated? > Signed-off-by: Yeoreum Yun <yeoreum.yun@arm.com> > Reviewed-by: Mark Brown <broonie@kernel.org> > --- > arch/arm64/kernel/acpi.c | 2 ++ > 1 file changed, 2 insertions(+) > > diff --git a/arch/arm64/kernel/acpi.c b/arch/arm64/kernel/acpi.c > index e6f66491fbe9..efdf24ed5c3e 100644 > --- a/arch/arm64/kernel/acpi.c > +++ b/arch/arm64/kernel/acpi.c > @@ -225,6 +225,8 @@ void __init acpi_boot_table_init(void) > pr_err("Failed to init ACPI tables\n"); > if (!param_acpi_force) > disable_acpi(); > + else > + panic("Failed to boot with ACPI tables\n"); > } > > done: > -- > LEVI:{C3F47F37-75D8-414A-A8BA-3980EC8A46D7} >
On Mon, Nov 25, 2024 at 06:30:06PM +0100, Ard Biesheuvel wrote: > On Mon, 25 Nov 2024 at 18:08, Yeoreum Yun <yeoreum.yun@arm.com> wrote: > > when the acpi=force option is used, > > the system does not fall back to the device tree (DT). > > If it fails to initialize the ACPI table, it cannot proceed further. > > In such cases, the system should invoke panic() to avoid contradicting > > the user's explicit intent, as failing or > > proceeding with unintended behavior would violate their wishes. > Calling panic() at this point does not achieve anything useful, > though. Without ACPI tables or a DT, the only way to observe this > panic message is by using earlycon= with an explicit MMIO address, and > it might be better to limp on instead. Is there anything bad that > might happen because of this, other than the user's wishes getting > violated? It does rather depend why the user specified acpi=force, it's kind of an unusual thing to specify on most systems...
Hi Ard. > > Calling panic() at this point does not achieve anything useful, > though. Without ACPI tables or a DT, the only way to observe this > panic message is by using earlycon= with an explicit MMIO address, and > it might be better to limp on instead. Is there anything bad that > might happen because of this, other than the user's wishes getting > violated? IMHO, the most weird thing is progressing boot with acpi table although it failed to initailise. in this situation continuing to boot maybe dead in unexepceted places. I think it would be better to prevent futher progress by calling the panic() in this situation.
When acpi=force option is used, the dt should be ignored whether it's invalid, passed from command line or from configuration table but it doesn't so it produces error message while scanning dt early time thou it isn't used in booting process. Change to ignore dt when acpi=force option is used. v2: - ignore getting dtb from configuration table when acpi=force option is used Yeoreum Yun (2): arm64/acpi: panic when failed to init acpi table with acpi=force option efi/fdt: ignore dtb when acpi option is used with force arch/arm64/kernel/acpi.c | 2 ++ drivers/firmware/efi/libstub/fdt.c | 10 ++++++---- 2 files changed, 8 insertions(+), 4 deletions(-) -- LEVI:{C3F47F37-75D8-414A-A8BA-3980EC8A46D7}