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

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Message-ID: <175ba9b3-d667-f887-e04c-f19ad15a57e4@loongson.cn>
Date:   Fri, 18 Aug 2023 14:03:49 +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



在 2023/8/18 00:40, Rafael J. Wysocki 写道:
> On Tue, Jul 25, 2023 at 2:32 AM bibo mao <maobibo@...ngson.cn> wrote:
>>
>> 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);
>>
> 
> Sorry for the delay.
> 
> Applied (under a slightly edited subject) as 6.6 material, thanks!

Thanks for applying the patch.