--- /dev/null
+/*
+ * 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>
+
+#define _COMPONENT ACPI_PROCESSOR_COMPONENT
+ACPI_MODULE_NAME("processor_core");
+
+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))
+ 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;
+}
+
+static phys_cpuid_t map_madt_entry(int type, u32 acpi_id)
+{
+ unsigned long madt_end, entry;
+ phys_cpuid_t phys_id = PHYS_CPUID_INVALID; /* CPU hardware ID */
+ struct acpi_table_madt *madt;
+
+ madt = get_madt_table();
+ 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;
+ }
+ entry += header->length;
+ }
+ return phys_id;
+}
+
+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);
+
+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 (phys_id == PHYS_CPUID_INVALID)
+ phys_id = map_madt_entry(type, acpi_id);
+
+ return phys_id;
+}
+
+int acpi_map_cpuid(phys_cpuid_t phys_id, u32 acpi_id)
+{
+#ifdef CONFIG_SMP
+ int i;
+#endif
+
+ if (phys_id == PHYS_CPUID_INVALID) {
+ /*
+ * 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 -1 for other CPU's handle.
+ */
+ if (nr_cpu_ids <= 1 && acpi_id == 0)
+ return acpi_id;
+ else
+ return -1;
+ }
+
+#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 -1;
+}
+
+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 */
Code Review / kvmfornfv.git / blobdiff