On Tuesday, July 18, 2017 06:04:20 PM Andy Shevchenko wrote:
> As per note in 5.2.9 Fixed ACPI Description Table (FADT) chapter of ACPI
> specification OSPM will ignore fields related to the ACPI HW register
> interface, one of which is SCI_INT.
>
> Follow the spec and ignore any configuration done for interrupt line
> defined by SCI_INT if FADT specifies HW reduced platform.
>
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
Can we invalidate acpi_gbl_FADT.sci_interrupt somehow for
acpi_gbl_reduced_hardware?
The checks added below look somewhat arbitrary and it would be good to
provide some argumentation on why everything is covered by them as needed.
> ---
> arch/x86/kernel/acpi/boot.c | 4 ++--
> drivers/acpi/bus.c | 2 +-
> drivers/acpi/osl.c | 2 +-
> 3 files changed, 4 insertions(+), 4 deletions(-)
>
> diff --git a/arch/x86/kernel/acpi/boot.c b/arch/x86/kernel/acpi/boot.c
> index 71c0feae60a4..c767efa53ee0 100644
> --- a/arch/x86/kernel/acpi/boot.c
> +++ b/arch/x86/kernel/acpi/boot.c
> @@ -489,7 +489,7 @@ acpi_parse_int_src_ovr(struct acpi_subtable_header * header,
>
> acpi_table_print_madt_entry(header);
>
> - if (intsrc->source_irq == acpi_gbl_FADT.sci_interrupt) {
> + if (intsrc->source_irq == acpi_gbl_FADT.sci_interrupt && !acpi_gbl_reduced_hardware) {
> acpi_sci_ioapic_setup(intsrc->source_irq,
> intsrc->inti_flags & ACPI_MADT_POLARITY_MASK,
> (intsrc->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2,
> @@ -1184,7 +1184,7 @@ static int __init acpi_parse_madt_ioapic_entries(void)
> * If BIOS did not supply an INT_SRC_OVR for the SCI
> * pretend we got one so we can set the SCI flags.
> */
> - if (!acpi_sci_override_gsi)
> + if (!acpi_sci_override_gsi && !acpi_gbl_reduced_hardware)
> acpi_sci_ioapic_setup(acpi_gbl_FADT.sci_interrupt, 0, 0,
> acpi_gbl_FADT.sci_interrupt);
>
> diff --git a/drivers/acpi/bus.c b/drivers/acpi/bus.c
> index af74b420ec83..1f3dde3bc8f8 100644
> --- a/drivers/acpi/bus.c
> +++ b/drivers/acpi/bus.c
> @@ -1035,7 +1035,7 @@ void __init acpi_early_init(void)
> }
>
> #ifdef CONFIG_X86
> - if (!acpi_ioapic) {
> + if (!acpi_ioapic && !acpi_gbl_reduced_hardware) {
> /* compatible (0) means level (3) */
> if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) {
> acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK;
> diff --git a/drivers/acpi/osl.c b/drivers/acpi/osl.c
> index db78d353bab1..4d84118a000b 100644
> --- a/drivers/acpi/osl.c
> +++ b/drivers/acpi/osl.c
> @@ -553,7 +553,7 @@ acpi_os_install_interrupt_handler(u32 gsi, acpi_osd_handler handler,
> * ACPI interrupts different from the SCI in our copy of the FADT are
> * not supported.
> */
> - if (gsi != acpi_gbl_FADT.sci_interrupt)
> + if (gsi != acpi_gbl_FADT.sci_interrupt || acpi_gbl_reduced_hardware)
> return AE_BAD_PARAMETER;
>
> if (acpi_irq_handler)
>
--
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