On Mon, Jul 10, 2023 at 8:33 AM Bibo Mao <maobibo@xxxxxxxxxxx> wrote:
>
> With ACPI Spec 6.5 physical id can be parsed from MADT table for
> LoongArch system, also it can be used in MAT table for cpu hotplug
> stage. This patch adds physical id parsing for LoongArch system.
>
> Signed-off-by: Bibo Mao <maobibo@xxxxxxxxxxx>
> ---
> drivers/acpi/processor_core.c | 25 +++++++++++++++++++++++++
> 1 file changed, 25 insertions(+)
>
> diff --git a/drivers/acpi/processor_core.c b/drivers/acpi/processor_core.c
> index d6606a9f2da6..51239cd2a485 100644
> --- a/drivers/acpi/processor_core.c
> +++ b/drivers/acpi/processor_core.c
> @@ -132,6 +132,26 @@ 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 *apic_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;
> +
> + if (device_declaration && (core_pic->processor_id == acpi_id)) {
> + *apic_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 +185,9 @@ 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))
Is ACPI_MADT_TYPE_CORE_PIC specific to LoongArch? The changelog
should mention it if that's the case.
> + break;
> }
> entry += header->length;
> }
> @@ -216,6 +239,8 @@ 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);
> --
> 2.27.0
>
