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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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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 (apic->uid == acpi_id && (device_declaration || acpi_id < 255)) { *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, 0x00, 0x00000410, 0x06) {} * Processor (CPU1, 0x01, 0x00000410, 0x06) {} * Processor (CPU2, 0x02, 0x00000410, 0x06) {} * Processor (CPU3, 0x03, 0x00000410, 0x06) {} * } * * 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_IOAPICstatic 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 */