linux-kernel - Re: [PATCH RFC v3 13/21] ACPICA: Add new MADT GICC flags fields

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Date: Fri, 15 Dec 2023 16:23:22 +0000
From: Jonathan Cameron <Jonathan.Cameron@...wei.com>
To: "Russell King (Oracle)" <rmk+kernel@...linux.org.uk>
CC: <linux-pm@...r.kernel.org>, <loongarch@...ts.linux.dev>,
	<linux-acpi@...r.kernel.org>, <linux-arch@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <linux-arm-kernel@...ts.infradead.org>,
	<linux-riscv@...ts.infradead.org>, <kvmarm@...ts.linux.dev>,
	<x86@...nel.org>, <acpica-devel@...ts.linuxfoundation.org>,
	<linux-csky@...r.kernel.org>, <linux-doc@...r.kernel.org>,
	<linux-ia64@...r.kernel.org>, <linux-parisc@...r.kernel.org>, Salil Mehta
	<salil.mehta@...wei.com>, Jean-Philippe Brucker <jean-philippe@...aro.org>,
	<jianyong.wu@....com>, <justin.he@....com>, James Morse
	<james.morse@....com>, Lorenzo Pieralisi <lpieralisi@...nel.org>
Subject: Re: [PATCH RFC v3 13/21] ACPICA: Add new MADT GICC flags fields

On Wed, 13 Dec 2023 12:50:18 +0000
Russell King (Oracle) <rmk+kernel@...linux.org.uk> wrote:

> From: James Morse <james.morse@....com>
> 
> Add the new flag field to the MADT's GICC structure.
> 
> 'Online Capable' indicates a disabled CPU can be enabled later. See
> ACPI specification 6.5 Tabel 5.37: GICC CPU Interface Flags.
> 
> Signed-off-by: James Morse <james.morse@....com>
> Tested-by: Miguel Luis <miguel.luis@...cle.com>
> Tested-by: Vishnu Pajjuri <vishnu@...amperecomputing.com>
> Tested-by: Jianyong Wu <jianyong.wu@....com>
> Signed-off-by: Russell King (Oracle) <rmk+kernel@...linux.org.uk>

I see there is an acpica pull request including this bit but with a different name
For reference.
https://github.com/acpica/acpica/pull/914/commits/453a5f67567786522021d5f6913f561f8b3cabf6

+CC Lorenzo who submitted that.

> ---
> This patch probably needs to go via the upstream acpica project,
> but is included here so the feature can be tested.
> 
> If the ACPICA header files are updated before merging this patch set,
> this patch will need to be dropped.
> 
> Changes since RFC v2:
>  * Add ACPI specification reference.
> ---
>  include/acpi/actbl2.h | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/include/acpi/actbl2.h b/include/acpi/actbl2.h
> index 3751ae69432f..c433a079d8e1 100644
> --- a/include/acpi/actbl2.h
> +++ b/include/acpi/actbl2.h
> @@ -1046,6 +1046,7 @@ struct acpi_madt_generic_interrupt {
>  /* ACPI_MADT_ENABLED                    (1)      Processor is usable if set */
>  #define ACPI_MADT_PERFORMANCE_IRQ_MODE  (1<<1)	/* 01: Performance Interrupt Mode */
>  #define ACPI_MADT_VGIC_IRQ_MODE         (1<<2)	/* 02: VGIC Maintenance Interrupt mode */
> +#define ACPI_MADT_GICC_CPU_CAPABLE      (1<<3)	/* 03: CPU is online capable */

ACPI_MADT_GICC_ONLINE_CAPABLE

>  
>  /* 12: Generic Distributor (ACPI 5.0 + ACPI 6.0 changes) */
>