// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright ( C ) 2005 Intel Corporation
* Copyright ( C ) 2009 Hewlett - Packard Development Company , L . P .
*
* Alex Chiang < achiang @ hp . com >
* - Unified x86 / ia64 implementations
*
* I / O APIC hotplug support
* Yinghai Lu < yinghai @ kernel . org >
* Jiang Liu < jiang . liu @ intel . com >
*/
#include <linux/export.h>
#include <linux/acpi.h>
#include <acpi/processor.h>
static struct acpi_table_madt *get_madt_table(void )
{
static struct acpi_table_madt *madt;
static int read_madt;
if (!read_madt) {
if (ACPI_FAILURE(acpi_get_table(ACPI_SIG_MADT, 0 ,
(struct acpi_table_header **)&madt)))
madt = NULL;
read_madt++;
}
return madt;
}
static int map_lapic_id(struct acpi_subtable_header *entry,
u32 acpi_id, phys_cpuid_t *apic_id)
{
struct acpi_madt_local_apic *lapic =
container_of(entry, struct acpi_madt_local_apic, header);
if (!(lapic->lapic_flags & ACPI_MADT_ENABLED))
return -ENODEV;
if (lapic->processor_id != acpi_id)
return -EINVAL;
*apic_id = lapic->id;
return 0 ;
}
static int map_x2apic_id(struct acpi_subtable_header *entry,
int device_declaration, u32 acpi_id, phys_cpuid_t *apic_id)
{
struct acpi_madt_local_x2apic *apic =
container_of(entry, struct acpi_madt_local_x2apic, header);
if (!(apic->lapic_flags & ACPI_MADT_ENABLED))
return -ENODEV;
if (device_declaration && (apic->uid == acpi_id)) {
*apic_id = apic->local_apic_id;
return 0 ;
}
return -EINVAL;
}
static int map_lsapic_id(struct acpi_subtable_header *entry,
int device_declaration, u32 acpi_id, phys_cpuid_t *apic_id)
{
struct acpi_madt_local_sapic *lsapic =
container_of(entry, struct acpi_madt_local_sapic, header);
if (!(lsapic->lapic_flags & ACPI_MADT_ENABLED))
return -ENODEV;
if (device_declaration) {
if ((entry->length < 16 ) || (lsapic->uid != acpi_id))
return -EINVAL;
} else if (lsapic->processor_id != acpi_id)
return -EINVAL;
*apic_id = (lsapic->id << 8 ) | lsapic->eid;
return 0 ;
}
/*
* Retrieve the ARM CPU physical identifier ( MPIDR )
*/
static int map_gicc_mpidr(struct acpi_subtable_header *entry,
int device_declaration, u32 acpi_id, phys_cpuid_t *mpidr)
{
struct acpi_madt_generic_interrupt *gicc =
container_of(entry, struct acpi_madt_generic_interrupt, header);
if (!(gicc->flags &
(ACPI_MADT_ENABLED | ACPI_MADT_GICC_ONLINE_CAPABLE)))
return -ENODEV;
/* device_declaration means Device object in DSDT, in the
* GIC interrupt model , logical processors are required to
* have a Processor Device object in the DSDT , so we should
* check device_declaration here
*/
if (device_declaration && (gicc->uid == acpi_id)) {
*mpidr = gicc->arm_mpidr;
return 0 ;
}
return -EINVAL;
}
/*
* Retrieve the RISC - V hartid for the processor
*/
static int map_rintc_hartid(struct acpi_subtable_header *entry,
int device_declaration, u32 acpi_id,
phys_cpuid_t *hartid)
{
struct acpi_madt_rintc *rintc =
container_of(entry, struct acpi_madt_rintc, header);
if (!(rintc->flags & ACPI_MADT_ENABLED))
return -ENODEV;
/* device_declaration means Device object in DSDT, in the
* RISC - V , logical processors are required to
* have a Processor Device object in the DSDT , so we should
* check device_declaration here
*/
if (device_declaration && rintc->uid == acpi_id) {
*hartid = rintc->hart_id;
return 0 ;
}
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)
{
unsigned long madt_end, entry;
phys_cpuid_t phys_id = PHYS_CPUID_INVALID; /* CPU hardware ID */
if (!madt)
return phys_id;
entry = (unsigned long )madt;
madt_end = entry + madt->header.length;
/* Parse all entries looking for a match. */
entry += sizeof (struct acpi_table_madt);
while (entry + sizeof (struct acpi_subtable_header) < madt_end) {
struct acpi_subtable_header *header =
(struct acpi_subtable_header *)entry;
if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
if (!map_lapic_id(header, acpi_id, &phys_id))
break ;
} else if (header->type == ACPI_MADT_TYPE_LOCAL_X2APIC) {
if (!map_x2apic_id(header, type, acpi_id, &phys_id))
break ;
} else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
if (!map_lsapic_id(header, type, acpi_id, &phys_id))
break ;
} else if (header->type == ACPI_MADT_TYPE_GENERIC_INTERRUPT) {
if (!map_gicc_mpidr(header, type, acpi_id, &phys_id))
break ;
} 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;
}
return phys_id;
}
phys_cpuid_t __init acpi_map_madt_entry(u32 acpi_id)
{
struct acpi_table_madt *madt = NULL;
phys_cpuid_t rv;
acpi_get_table(ACPI_SIG_MADT, 0 ,
(struct acpi_table_header **)&madt);
if (!madt)
return PHYS_CPUID_INVALID;
rv = map_madt_entry(madt, 1 , acpi_id);
acpi_put_table((struct acpi_table_header *)madt);
return rv;
}
int __init acpi_get_madt_revision(void )
{
struct acpi_table_header *madt = NULL;
int revision;
if (ACPI_FAILURE(acpi_get_table(ACPI_SIG_MADT, 0 , &madt)))
return -EINVAL;
revision = madt->revision;
acpi_put_table(madt);
return revision;
}
static phys_cpuid_t map_mat_entry(acpi_handle handle, int type, u32 acpi_id)
{
struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
union acpi_object *obj;
struct acpi_subtable_header *header;
phys_cpuid_t phys_id = PHYS_CPUID_INVALID;
if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT" , NULL, &buffer)))
goto exit ;
if (!buffer.length || !buffer.pointer)
goto exit ;
obj = buffer.pointer;
if (obj->type != ACPI_TYPE_BUFFER ||
obj->buffer.length < sizeof (struct acpi_subtable_header)) {
goto exit ;
}
header = (struct acpi_subtable_header *)obj->buffer.pointer;
if (header->type == ACPI_MADT_TYPE_LOCAL_APIC)
map_lapic_id(header, acpi_id, &phys_id);
else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC)
map_lsapic_id(header, type, acpi_id, &phys_id);
else if (header->type == ACPI_MADT_TYPE_LOCAL_X2APIC)
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);
return phys_id;
}
phys_cpuid_t acpi_get_phys_id(acpi_handle handle, int type, u32 acpi_id)
{
phys_cpuid_t phys_id;
phys_id = map_mat_entry(handle, type, acpi_id);
if (invalid_phys_cpuid(phys_id))
phys_id = map_madt_entry(get_madt_table(), type, acpi_id);
return phys_id;
}
EXPORT_SYMBOL_GPL(acpi_get_phys_id);
int acpi_map_cpuid(phys_cpuid_t phys_id, u32 acpi_id)
{
#ifdef CONFIG_SMP
int i;
#endif
if (invalid_phys_cpuid(phys_id)) {
/*
* On UP processor , there is no _ MAT or MADT table .
* So above phys_id is always set to PHYS_CPUID_INVALID .
*
* BIOS may define multiple CPU handles even for UP processor .
* For example ,
*
* Scope ( _ PR )
* {
* Processor ( CPU0 , 0 x00 , 0 x00000410 , 0 x06 ) { }
* Processor ( CPU1 , 0 x01 , 0 x00000410 , 0 x06 ) { }
* Processor ( CPU2 , 0 x02 , 0 x00000410 , 0 x06 ) { }
* Processor ( CPU3 , 0 x03 , 0 x00000410 , 0 x06 ) { }
* }
*
* Ignores phys_id and always returns 0 for the processor
* handle with acpi id 0 if nr_cpu_ids is 1 .
* This should be the case if SMP tables are not found .
* Return - EINVAL for other CPU ' s handle .
*/
if (nr_cpu_ids <= 1 && acpi_id == 0 )
return acpi_id;
else
return -EINVAL;
}
#ifdef CONFIG_SMP
for_each_possible_cpu(i) {
if (cpu_physical_id(i) == phys_id)
return i;
}
#else
/* In UP kernel, only processor 0 is valid */
if (phys_id == 0 )
return phys_id;
#endif
return -ENODEV;
}
int acpi_get_cpuid(acpi_handle handle, int type, u32 acpi_id)
{
phys_cpuid_t phys_id;
phys_id = acpi_get_phys_id(handle, type, acpi_id);
return acpi_map_cpuid(phys_id, acpi_id);
}
EXPORT_SYMBOL_GPL(acpi_get_cpuid);
#ifdef CONFIG_ACPI_HOTPLUG_IOAPIC
static int get_ioapic_id(struct acpi_subtable_header *entry, u32 gsi_base,
u64 *phys_addr, int *ioapic_id)
{
struct acpi_madt_io_apic *ioapic = (struct acpi_madt_io_apic *)entry;
if (ioapic->global_irq_base != gsi_base)
return 0 ;
*phys_addr = ioapic->address;
*ioapic_id = ioapic->id;
return 1 ;
}
static int parse_madt_ioapic_entry(u32 gsi_base, u64 *phys_addr)
{
struct acpi_subtable_header *hdr;
unsigned long madt_end, entry;
struct acpi_table_madt *madt;
int apic_id = -1 ;
madt = get_madt_table();
if (!madt)
return apic_id;
entry = (unsigned long )madt;
madt_end = entry + madt->header.length;
/* Parse all entries looking for a match. */
entry += sizeof (struct acpi_table_madt);
while (entry + sizeof (struct acpi_subtable_header) < madt_end) {
hdr = (struct acpi_subtable_header *)entry;
if (hdr->type == ACPI_MADT_TYPE_IO_APIC &&
get_ioapic_id(hdr, gsi_base, phys_addr, &apic_id))
break ;
else
entry += hdr->length;
}
return apic_id;
}
static int parse_mat_ioapic_entry(acpi_handle handle, u32 gsi_base,
u64 *phys_addr)
{
struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
struct acpi_subtable_header *header;
union acpi_object *obj;
int apic_id = -1 ;
if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT" , NULL, &buffer)))
goto exit ;
if (!buffer.length || !buffer.pointer)
goto exit ;
obj = buffer.pointer;
if (obj->type != ACPI_TYPE_BUFFER ||
obj->buffer.length < sizeof (struct acpi_subtable_header))
goto exit ;
header = (struct acpi_subtable_header *)obj->buffer.pointer;
if (header->type == ACPI_MADT_TYPE_IO_APIC)
get_ioapic_id(header, gsi_base, phys_addr, &apic_id);
exit :
kfree(buffer.pointer);
return apic_id;
}
/**
* acpi_get_ioapic_id - Get IOAPIC ID and physical address matching @ gsi_base
* @ handle : ACPI object for IOAPIC device
* @ gsi_base : GSI base to match with
* @ phys_addr : Pointer to store physical address of matching IOAPIC record
*
* Walk resources returned by ACPI_MAT method , then ACPI MADT table , to search
* for an ACPI IOAPIC record matching @ gsi_base .
* Return IOAPIC id and store physical address in @ phys_addr if found a match ,
* otherwise return < 0 .
*/
int acpi_get_ioapic_id(acpi_handle handle, u32 gsi_base, u64 *phys_addr)
{
int apic_id;
apic_id = parse_mat_ioapic_entry(handle, gsi_base, phys_addr);
if (apic_id == -1 )
apic_id = parse_madt_ioapic_entry(gsi_base, phys_addr);
return apic_id;
}
#endif /* CONFIG_ACPI_HOTPLUG_IOAPIC */
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