1 files changed, 266 insertions, 216 deletions

diff --git a/drivers/acpi/processor_core.c b/drivers/acpi/processor_core.c
index 164d49569aeb..a4498357bd16 100644
--- a/drivers/acpi/processor_core.c
+++ b/drivers/acpi/processor_core.c
@@ -1,111 +1,170 @@
+// 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
- *	Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
- *	- Added _PDC for platforms with Intel CPUs
+ *
+ * I/O APIC hotplug support
+ *	Yinghai Lu <yinghai@kernel.org>
+ *	Jiang Liu <jiang.liu@intel.com>
  */
 #include <linux/export.h>
-#include <linux/dmi.h>
-#include <linux/slab.h>
-
-#include <acpi/acpi_drivers.h>
+#include <linux/acpi.h>
 #include <acpi/processor.h>
 
-#include "internal.h"
+static struct acpi_table_madt *get_madt_table(void)
+{
+	static struct acpi_table_madt *madt;
+	static int read_madt;
 
-#define PREFIX			"ACPI: "
-#define _COMPONENT		ACPI_PROCESSOR_COMPONENT
-ACPI_MODULE_NAME("processor_core");
+	if (!read_madt) {
+		if (ACPI_FAILURE(acpi_get_table(ACPI_SIG_MADT, 0,
+					(struct acpi_table_header **)&madt)))
+			madt = NULL;
+		read_madt++;
+	}
 
-static int __init set_no_mwait(const struct dmi_system_id *id)
-{
-	printk(KERN_NOTICE PREFIX "%s detected - "
-		"disabling mwait for CPU C-states\n", id->ident);
-	boot_option_idle_override = IDLE_NOMWAIT;
-	return 0;
+	return madt;
 }
 
-static struct dmi_system_id __initdata processor_idle_dmi_table[] = {
-	{
-	set_no_mwait, "Extensa 5220", {
-	DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
-	DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
-	DMI_MATCH(DMI_PRODUCT_VERSION, "0100"),
-	DMI_MATCH(DMI_BOARD_NAME, "Columbia") }, NULL},
-	{},
-};
-
 static int map_lapic_id(struct acpi_subtable_header *entry,
-		 u32 acpi_id, int *apic_id)
+		 u32 acpi_id, phys_cpuid_t *apic_id)
 {
 	struct acpi_madt_local_apic *lapic =
-		(struct acpi_madt_local_apic *)entry;
+		container_of(entry, struct acpi_madt_local_apic, header);
 
 	if (!(lapic->lapic_flags & ACPI_MADT_ENABLED))
-		return 0;
+		return -ENODEV;
 
 	if (lapic->processor_id != acpi_id)
-		return 0;
+		return -EINVAL;
 
 	*apic_id = lapic->id;
-	return 1;
+	return 0;
 }
 
 static int map_x2apic_id(struct acpi_subtable_header *entry,
-			 int device_declaration, u32 acpi_id, int *apic_id)
+		int device_declaration, u32 acpi_id, phys_cpuid_t *apic_id)
 {
 	struct acpi_madt_local_x2apic *apic =
-		(struct acpi_madt_local_x2apic *)entry;
+		container_of(entry, struct acpi_madt_local_x2apic, header);
 
 	if (!(apic->lapic_flags & ACPI_MADT_ENABLED))
-		return 0;
+		return -ENODEV;
 
-	if (device_declaration && (apic->uid == acpi_id)) {
+	if (apic->uid == acpi_id && (device_declaration || acpi_id < 255)) {
 		*apic_id = apic->local_apic_id;
-		return 1;
+		return 0;
 	}
 
-	return 0;
+	return -EINVAL;
 }
 
 static int map_lsapic_id(struct acpi_subtable_header *entry,
-		int device_declaration, u32 acpi_id, int *apic_id)
+		int device_declaration, u32 acpi_id, phys_cpuid_t *apic_id)
 {
 	struct acpi_madt_local_sapic *lsapic =
-		(struct acpi_madt_local_sapic *)entry;
+		container_of(entry, struct acpi_madt_local_sapic, header);
 
 	if (!(lsapic->lapic_flags & ACPI_MADT_ENABLED))
-		return 0;
+		return -ENODEV;
 
 	if (device_declaration) {
 		if ((entry->length < 16) || (lsapic->uid != acpi_id))
-			return 0;
+			return -EINVAL;
 	} else if (lsapic->processor_id != acpi_id)
-		return 0;
+		return -EINVAL;
 
 	*apic_id = (lsapic->id << 8) | lsapic->eid;
-	return 1;
+	return 0;
 }
 
-static int map_madt_entry(int type, u32 acpi_id)
+/*
+ * 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)
 {
-	unsigned long madt_end, entry;
-	static struct acpi_table_madt *madt;
-	static int read_madt;
-	int apic_id = -1;
+	struct acpi_madt_generic_interrupt *gicc =
+	    container_of(entry, struct acpi_madt_generic_interrupt, header);
 
-	if (!read_madt) {
-		if (ACPI_FAILURE(acpi_get_table(ACPI_SIG_MADT, 0,
-					(struct acpi_table_header **)&madt)))
-			madt = NULL;
-		read_madt++;
+	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 apic_id;
+		return phys_id;
 
 	entry = (unsigned long)madt;
 	madt_end = entry + madt->header.length;
@@ -117,26 +176,67 @@ static int map_madt_entry(int type, u32 acpi_id)
 		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, &apic_id))
+			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, &apic_id))
+			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, &apic_id))
+			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 apic_id;
+	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 int map_mat_entry(acpi_handle handle, int type, u32 acpi_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;
-	int apic_id = -1;
+	phys_cpuid_t phys_id = PHYS_CPUID_INVALID;
 
 	if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
 		goto exit;
@@ -151,229 +251,179 @@ static int map_mat_entry(acpi_handle handle, int type, u32 acpi_id)
 	}
 
 	header = (struct acpi_subtable_header *)obj->buffer.pointer;
-	if (header->type == ACPI_MADT_TYPE_LOCAL_APIC) {
-		map_lapic_id(header, acpi_id, &apic_id);
-	} else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
-		map_lsapic_id(header, type, acpi_id, &apic_id);
-	}
+	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 apic_id;
+	return phys_id;
 }
 
-int acpi_get_cpuid(acpi_handle handle, int type, u32 acpi_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
-	int apic_id = -1;
 
-	apic_id = map_mat_entry(handle, type, acpi_id);
-	if (apic_id == -1)
-		apic_id = map_madt_entry(type, acpi_id);
-	if (apic_id == -1) {
+	if (invalid_phys_cpuid(phys_id)) {
 		/*
 		 * On UP processor, there is no _MAT or MADT table.
-		 * So above apic_id is always set to -1.
+		 * 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 apic_id and always returns 0 for the processor
+		 * 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.
+		 * Return -EINVAL for other CPU's handle.
 		 */
 		if (nr_cpu_ids <= 1 && acpi_id == 0)
 			return acpi_id;
 		else
-			return apic_id;
+			return -EINVAL;
 	}
 
 #ifdef CONFIG_SMP
 	for_each_possible_cpu(i) {
-		if (cpu_physical_id(i) == apic_id)
+		if (cpu_physical_id(i) == phys_id)
 			return i;
 	}
 #else
 	/* In UP kernel, only processor 0 is valid */
-	if (apic_id == 0)
-		return apic_id;
+	if (phys_id == 0)
+		return phys_id;
 #endif
-	return -1;
+	return -ENODEV;
 }
-EXPORT_SYMBOL_GPL(acpi_get_cpuid);
 
-static bool __init processor_physically_present(acpi_handle handle)
+int acpi_get_cpuid(acpi_handle handle, int type, u32 acpi_id)
 {
-	int cpuid, type;
-	u32 acpi_id;
-	acpi_status status;
-	acpi_object_type acpi_type;
-	unsigned long long tmp;
-	union acpi_object object = { 0 };
-	struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
-
-	status = acpi_get_type(handle, &acpi_type);
-	if (ACPI_FAILURE(status))
-		return false;
-
-	switch (acpi_type) {
-	case ACPI_TYPE_PROCESSOR:
-		status = acpi_evaluate_object(handle, NULL, NULL, &buffer);
-		if (ACPI_FAILURE(status))
-			return false;
-		acpi_id = object.processor.proc_id;
-		break;
-	case ACPI_TYPE_DEVICE:
-		status = acpi_evaluate_integer(handle, "_UID", NULL, &tmp);
-		if (ACPI_FAILURE(status))
-			return false;
-		acpi_id = tmp;
-		break;
-	default:
-		return false;
-	}
+	phys_cpuid_t phys_id;
 
-	type = (acpi_type == ACPI_TYPE_DEVICE) ? 1 : 0;
-	cpuid = acpi_get_cpuid(handle, type, acpi_id);
+	phys_id = acpi_get_phys_id(handle, type, acpi_id);
 
-	if (cpuid == -1)
-		return false;
-
-	return true;
+	return acpi_map_cpuid(phys_id, acpi_id);
 }
+EXPORT_SYMBOL_GPL(acpi_get_cpuid);
 
-static void __cpuinit acpi_set_pdc_bits(u32 *buf)
+#ifdef CONFIG_ACPI_HOTPLUG_IOAPIC
+static int get_ioapic_id(struct acpi_subtable_header *entry, u32 gsi_base,
+			 u64 *phys_addr, int *ioapic_id)
 {
-	buf[0] = ACPI_PDC_REVISION_ID;
-	buf[1] = 1;
+	struct acpi_madt_io_apic *ioapic = (struct acpi_madt_io_apic *)entry;
 
-	/* Enable coordination with firmware's _TSD info */
-	buf[2] = ACPI_PDC_SMP_T_SWCOORD;
+	if (ioapic->global_irq_base != gsi_base)
+		return 0;
 
-	/* Twiddle arch-specific bits needed for _PDC */
-	arch_acpi_set_pdc_bits(buf);
+	*phys_addr = ioapic->address;
+	*ioapic_id = ioapic->id;
+	return 1;
 }
 
-static struct acpi_object_list *__cpuinit acpi_processor_alloc_pdc(void)
+static int parse_madt_ioapic_entry(u32 gsi_base, u64 *phys_addr)
 {
-	struct acpi_object_list *obj_list;
-	union acpi_object *obj;
-	u32 *buf;
+	struct acpi_subtable_header *hdr;
+	unsigned long madt_end, entry;
+	struct acpi_table_madt *madt;
+	int apic_id = -1;
 
-	/* allocate and initialize pdc. It will be used later. */
-	obj_list = kmalloc(sizeof(struct acpi_object_list), GFP_KERNEL);
-	if (!obj_list) {
-		printk(KERN_ERR "Memory allocation error\n");
-		return NULL;
-	}
+	madt = get_madt_table();
+	if (!madt)
+		return apic_id;
 
-	obj = kmalloc(sizeof(union acpi_object), GFP_KERNEL);
-	if (!obj) {
-		printk(KERN_ERR "Memory allocation error\n");
-		kfree(obj_list);
-		return NULL;
-	}
+	entry = (unsigned long)madt;
+	madt_end = entry + madt->header.length;
 
-	buf = kmalloc(12, GFP_KERNEL);
-	if (!buf) {
-		printk(KERN_ERR "Memory allocation error\n");
-		kfree(obj);
-		kfree(obj_list);
-		return NULL;
+	/* 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;
 	}
 
-	acpi_set_pdc_bits(buf);
-
-	obj->type = ACPI_TYPE_BUFFER;
-	obj->buffer.length = 12;
-	obj->buffer.pointer = (u8 *) buf;
-	obj_list->count = 1;
-	obj_list->pointer = obj;
-
-	return obj_list;
+	return apic_id;
 }
 
-/*
- * _PDC is required for a BIOS-OS handshake for most of the newer
- * ACPI processor features.
- */
-static int __cpuinit
-acpi_processor_eval_pdc(acpi_handle handle, struct acpi_object_list *pdc_in)
+static int parse_mat_ioapic_entry(acpi_handle handle, u32 gsi_base,
+				  u64 *phys_addr)
 {
-	acpi_status status = AE_OK;
-
-	if (boot_option_idle_override == IDLE_NOMWAIT) {
-		/*
-		 * If mwait is disabled for CPU C-states, the C2C3_FFH access
-		 * mode will be disabled in the parameter of _PDC object.
-		 * Of course C1_FFH access mode will also be disabled.
-		 */
-		union acpi_object *obj;
-		u32 *buffer = NULL;
-
-		obj = pdc_in->pointer;
-		buffer = (u32 *)(obj->buffer.pointer);
-		buffer[2] &= ~(ACPI_PDC_C_C2C3_FFH | ACPI_PDC_C_C1_FFH);
-
-	}
-	status = acpi_evaluate_object(handle, "_PDC", pdc_in, NULL);
-
-	if (ACPI_FAILURE(status))
-		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
-		    "Could not evaluate _PDC, using legacy perf. control.\n"));
-
-	return status;
-}
+	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
+	struct acpi_subtable_header *header;
+	union acpi_object *obj;
+	int apic_id = -1;
 
-void __cpuinit acpi_processor_set_pdc(acpi_handle handle)
-{
-	struct acpi_object_list *obj_list;
+	if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
+		goto exit;
 
-	if (arch_has_acpi_pdc() == false)
-		return;
+	if (!buffer.length || !buffer.pointer)
+		goto exit;
 
-	obj_list = acpi_processor_alloc_pdc();
-	if (!obj_list)
-		return;
+	obj = buffer.pointer;
+	if (obj->type != ACPI_TYPE_BUFFER ||
+	    obj->buffer.length < sizeof(struct acpi_subtable_header))
+		goto exit;
 
-	acpi_processor_eval_pdc(handle, obj_list);
+	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);
 
-	kfree(obj_list->pointer->buffer.pointer);
-	kfree(obj_list->pointer);
-	kfree(obj_list);
+exit:
+	kfree(buffer.pointer);
+	return apic_id;
 }
 
-static acpi_status __init
-early_init_pdc(acpi_handle handle, u32 lvl, void *context, void **rv)
+/**
+ * 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)
 {
-	if (processor_physically_present(handle) == false)
-		return AE_OK;
-
-	acpi_processor_set_pdc(handle);
-	return AE_OK;
-}
+	int apic_id;
 
-void __init acpi_early_processor_set_pdc(void)
-{
-	/*
-	 * Check whether the system is DMI table. If yes, OSPM
-	 * should not use mwait for CPU-states.
-	 */
-	dmi_check_system(processor_idle_dmi_table);
+	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);
 
-	acpi_walk_namespace(ACPI_TYPE_PROCESSOR, ACPI_ROOT_OBJECT,
-			    ACPI_UINT32_MAX,
-			    early_init_pdc, NULL, NULL, NULL);
-	acpi_get_devices("ACPI0007", early_init_pdc, NULL, NULL);
+	return apic_id;
 }
+#endif /* CONFIG_ACPI_HOTPLUG_IOAPIC */