1 files changed, 355 insertions, 0 deletions
diff --git a/drivers/acpi/processor_core.c b/drivers/acpi/processor_core.c
new file mode 100644
index 000000000..2ac48cda5
--- /dev/null
+++ b/drivers/acpi/processor_core.c
@@ -0,0 +1,355 @@
+// 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))
+		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(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;
+		}
+		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;
+}
+
+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 (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_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 */