linux-kernel - Re: [PATCH v3 2/5] acpi: Refactor arch_acpi_set_pdc

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Message-ID: <CAJZ5v0gfvkhw1+QJkvaURn609oNYc_2c=CKk+fEvfjZvu4zN=A@mail.gmail.com>
Date:   Thu, 29 Jun 2023 12:48:38 +0200
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Michal Wilczynski <michal.wilczynski@...el.com>, x86@...nel.org
Cc:     linux-acpi@...r.kernel.org, rafael@...nel.org,
        andriy.shevchenko@...el.com, artem.bityutskiy@...ux.intel.com,
        mingo@...hat.com, bp@...en8.de, dave.hansen@...ux.intel.com,
        hpa@...or.com, lenb@...nel.org, jgross@...e.com,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 2/5] acpi: Refactor arch_acpi_set_pdc_bits()

On Tue, Jun 13, 2023 at 6:12 PM Michal Wilczynski
<michal.wilczynski@...el.com> wrote:
>
> Capabilities buffer modified by the arch_acpi_set_pdc_bits() is not
> _PDC specific, as it is used by _OSC method as well. Change function
> name to better reflect it's independence from PDC. Change function
> expected argument to pass capability buffer directly without any
> offset, as the offset differ among _OSC and _PDC methods.
>
> Suggested-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> Signed-off-by: Michal Wilczynski <michal.wilczynski@...el.com>
> Reviewed-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>

Any objections to this from the x86 arch side?  if not, I will route
it via ACPI along with the rest of the series.

> ---
>  arch/ia64/include/asm/acpi.h |  4 ++--
>  arch/x86/include/asm/acpi.h  | 10 +++++-----
>  drivers/acpi/processor_pdc.c |  2 +-
>  3 files changed, 8 insertions(+), 8 deletions(-)
>
> diff --git a/arch/ia64/include/asm/acpi.h b/arch/ia64/include/asm/acpi.h
> index 87927eb824cc..43797cb44383 100644
> --- a/arch/ia64/include/asm/acpi.h
> +++ b/arch/ia64/include/asm/acpi.h
> @@ -69,9 +69,9 @@ extern int __initdata nid_to_pxm_map[MAX_NUMNODES];
>  #endif
>
>  static inline bool arch_has_acpi_pdc(void) { return true; }
> -static inline void arch_acpi_set_pdc_bits(u32 *buf)
> +static inline void arch_acpi_set_proc_cap_bits(u32 *cap)
>  {
> -       buf[2] |= ACPI_PDC_EST_CAPABILITY_SMP;
> +       *cap |= ACPI_PDC_EST_CAPABILITY_SMP;
>  }
>
>  #ifdef CONFIG_ACPI_NUMA
> diff --git a/arch/x86/include/asm/acpi.h b/arch/x86/include/asm/acpi.h
> index 8eb74cf386db..6a498d1781e7 100644
> --- a/arch/x86/include/asm/acpi.h
> +++ b/arch/x86/include/asm/acpi.h
> @@ -100,23 +100,23 @@ static inline bool arch_has_acpi_pdc(void)
>                 c->x86_vendor == X86_VENDOR_CENTAUR);
>  }
>
> -static inline void arch_acpi_set_pdc_bits(u32 *buf)
> +static inline void arch_acpi_set_proc_cap_bits(u32 *cap)
>  {
>         struct cpuinfo_x86 *c = &cpu_data(0);
>
> -       buf[2] |= ACPI_PDC_C_CAPABILITY_SMP;
> +       *cap |= ACPI_PDC_C_CAPABILITY_SMP;
>
>         if (cpu_has(c, X86_FEATURE_EST))
> -               buf[2] |= ACPI_PDC_EST_CAPABILITY_SWSMP;
> +               *cap |= ACPI_PDC_EST_CAPABILITY_SWSMP;
>
>         if (cpu_has(c, X86_FEATURE_ACPI))
> -               buf[2] |= ACPI_PDC_T_FFH;
> +               *cap |= ACPI_PDC_T_FFH;
>
>         /*
>          * If mwait/monitor is unsupported, C2/C3_FFH will be disabled
>          */
>         if (!cpu_has(c, X86_FEATURE_MWAIT))
> -               buf[2] &= ~(ACPI_PDC_C_C2C3_FFH);
> +               *cap &= ~(ACPI_PDC_C_C2C3_FFH);
>  }
>
>  static inline bool acpi_has_cpu_in_madt(void)
> diff --git a/drivers/acpi/processor_pdc.c b/drivers/acpi/processor_pdc.c
> index 5596862e6fea..ce3acd86dd12 100644
> --- a/drivers/acpi/processor_pdc.c
> +++ b/drivers/acpi/processor_pdc.c
> @@ -24,7 +24,7 @@ static void acpi_set_pdc_bits(u32 *buf)
>         buf[2] = ACPI_PDC_SMP_T_SWCOORD;
>
>         /* Twiddle arch-specific bits needed for _PDC */
> -       arch_acpi_set_pdc_bits(buf);
> +       arch_acpi_set_proc_cap_bits(&buf[2]);
>  }
>
>  static struct acpi_object_list *acpi_processor_alloc_pdc(void)
> --
> 2.41.0
>