linux-kernel - Re: [PATCH v2] ACPI: processor_core: LoongArch: Get physical id from MADT table

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Message-ID: <fbe94cf6-0fd0-fbb5-4308-e1730e3af214@loongson.cn>
Date:   Tue, 25 Jul 2023 08:32:29 +0800
From:   bibo mao <maobibo@...ngson.cn>
To:     "Rafael J . Wysocki" <rafael@...nel.org>
Cc:     Len Brown <lenb@...nel.org>, linux-acpi@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] ACPI: processor_core: LoongArch: Get physical id from
 MADT table

slightly ping :)

在 2023/7/17 10:22, Bibo Mao 写道:
> With ACPI Spec 6.5 chapter 5.2.12.20, each processor in LoongArch
> system has a Core Programmable Interrupt Controller in MADT table,
> value of its type is 0x11 in the spec and defined as enum variable
> ACPI_MADT_TYPE_CORE_PIC in Linux kernel. Physical id can be parsed
> from MADT table for LoongArch system, also it can be parsed from
> MAT table for hotplug cpu. This patch adds physical id parsing for
> LoongArch system.
> 
> Signed-off-by: Bibo Mao <maobibo@...ngson.cn>
> ---
> Changes in v2:
>  Refresh the changelog and add detailed description of acpi spec
>  about MADT table for LoongArch system.
> 
>  Add comments in function map_core_pic_id.
>  
> ---
>  drivers/acpi/processor_core.c | 29 +++++++++++++++++++++++++++++
>  1 file changed, 29 insertions(+)
> 
> diff --git a/drivers/acpi/processor_core.c b/drivers/acpi/processor_core.c
> index d6606a9f2da6..7dd6dbaa98c3 100644
> --- a/drivers/acpi/processor_core.c
> +++ b/drivers/acpi/processor_core.c
> @@ -132,6 +132,30 @@ static int map_rintc_hartid(struct acpi_subtable_header *entry,
>  	return -EINVAL;
>  }
>  
> +/*
> + * Retrieve LoongArch CPU physical id
> + */
> +static int map_core_pic_id(struct acpi_subtable_header *entry,
> +		int device_declaration, u32 acpi_id, phys_cpuid_t *phys_id)
> +{
> +	struct acpi_madt_core_pic *core_pic =
> +		container_of(entry, struct acpi_madt_core_pic, header);
> +
> +	if (!(core_pic->flags & ACPI_MADT_ENABLED))
> +		return -ENODEV;
> +
> +	/* device_declaration means Device object in DSDT, in LoongArch
> +	 * system, logical processor acpi_id is required in _UID property
> +	 * of DSDT table, so we should check device_declaration here
> +	 */
> +	if (device_declaration && (core_pic->processor_id == acpi_id)) {
> +		*phys_id = core_pic->core_id;
> +		return 0;
> +	}
> +
> +	return -EINVAL;
> +}
> +
>  static phys_cpuid_t map_madt_entry(struct acpi_table_madt *madt,
>  				   int type, u32 acpi_id)
>  {
> @@ -165,6 +189,9 @@ static phys_cpuid_t map_madt_entry(struct acpi_table_madt *madt,
>  		} else if (header->type == ACPI_MADT_TYPE_RINTC) {
>  			if (!map_rintc_hartid(header, type, acpi_id, &phys_id))
>  				break;
> +		} else if (header->type == ACPI_MADT_TYPE_CORE_PIC) {
> +			if (!map_core_pic_id(header, type, acpi_id, &phys_id))
> +				break;
>  		}
>  		entry += header->length;
>  	}
> @@ -216,6 +243,8 @@ static phys_cpuid_t map_mat_entry(acpi_handle handle, int type, u32 acpi_id)
>  		map_x2apic_id(header, type, acpi_id, &phys_id);
>  	else if (header->type == ACPI_MADT_TYPE_GENERIC_INTERRUPT)
>  		map_gicc_mpidr(header, type, acpi_id, &phys_id);
> +	else if (header->type == ACPI_MADT_TYPE_CORE_PIC)
> +		map_core_pic_id(header, type, acpi_id, &phys_id);
>  
>  exit:
>  	kfree(buffer.pointer);