On Tue, Feb 20, 2018 at 7:05 PM, Andy Shevchenko
<andriy.shevchenko@xxxxxxxxxxxxxxx> wrote:
> Some ACPI hardware reduced platforms need to initialize certain devices
> defined by the ACPI hardware specification even though in principle
> those devices should not be present in an ACPI hardware reduced platform.
>
> To allow that to happen, make it possible to override the generic
> x86_init callbacks and provide a custom legacy_pic value, add a new
> ->reduced_hw_early_init() callback to struct x86_init_acpi and make
> acpi_reduced_hw_init() use it.
>
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
Reviewed-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
> ---
>
> - address Rafael's comments
> - requires patches from Juergen Gross
> - supposed to go via tip tree (x86/boot branch)
> - tested on ASuS T100ta (HW reduced) and Intel Broxton based platforms
>
> arch/x86/include/asm/x86_init.h | 2 ++
> arch/x86/kernel/acpi/boot.c | 2 +-
> arch/x86/kernel/x86_init.c | 2 ++
> 3 files changed, 5 insertions(+), 1 deletion(-)
>
> diff --git a/arch/x86/include/asm/x86_init.h b/arch/x86/include/asm/x86_init.h
> index 2e2c34d2bb00..5bd45a8f5ae3 100644
> --- a/arch/x86/include/asm/x86_init.h
> +++ b/arch/x86/include/asm/x86_init.h
> @@ -133,9 +133,11 @@ struct x86_hyper_init {
> /**
> * struct x86_init_acpi - x86 ACPI init functions
> * @get_root_pointer: get RSDP address
> + * @reduced_hw_early_init: hardware reduced platform early init
> */
> struct x86_init_acpi {
> u64 (*get_root_pointer)(void);
> + void (*reduced_hw_early_init)(void);
> };
>
> /**
> diff --git a/arch/x86/kernel/acpi/boot.c b/arch/x86/kernel/acpi/boot.c
> index baa084ecffdb..7a37d9357bc4 100644
> --- a/arch/x86/kernel/acpi/boot.c
> +++ b/arch/x86/kernel/acpi/boot.c
> @@ -1390,7 +1390,7 @@ void __init acpi_generic_reduced_hw_init(void)
> static void __init acpi_reduced_hw_init(void)
> {
> if (acpi_gbl_reduced_hardware)
> - acpi_generic_reduced_hw_init();
> + x86_init.acpi.reduced_hw_early_init();
> }
>
> /*
> diff --git a/arch/x86/kernel/x86_init.c b/arch/x86/kernel/x86_init.c
> index 9e4e994a4836..03452b73e2ea 100644
> --- a/arch/x86/kernel/x86_init.c
> +++ b/arch/x86/kernel/x86_init.c
> @@ -8,6 +8,7 @@
> #include <linux/export.h>
> #include <linux/pci.h>
>
> +#include <asm/acpi.h>
> #include <asm/bios_ebda.h>
> #include <asm/paravirt.h>
> #include <asm/pci_x86.h>
> @@ -95,6 +96,7 @@ struct x86_init_ops x86_init __initdata = {
>
> .acpi = {
> .get_root_pointer = u64_x86_init_noop,
> + .reduced_hw_early_init = acpi_generic_reduced_hw_init,
> },
> };
>
> --
> 2.15.1
>
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