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ACPI: processor: LoongArch: Get physical ID from MADT

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With ACPI Spec 6.5 chapter 5.2.12.20, each processor in LoongArch
systems has a Core Programmable Interrupt Controller in MADT. The
value of its type is 0x11 in the spec and defined as enum variable
ACPI_MADT_TYPE_CORE_PIC in the Linux kernel.

Physical IDs can be retrieved from MADT for LoongArch systems during
initialization and they can be retrieved from the _MAT output for
hotplug CPUs.

Add physical CPU ID enumeration for LoongArch systems.

Signed-off-by: Bibo Mao <maobibo@loongson.cn>
[ rjw: Subject and changelog edits ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Bibo Mao 2023-07-17 10:22:58 +08:00 committed by Rafael J. Wysocki
parent 003e0694fc
commit f6fcf03ce8
1 changed files with 29 additions and 0 deletions
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29
drivers/acpi/processor_core.c
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@ -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);