1 // SPDX-License-Identifier: GPL-2.0-only
3  * acpi_processor.c - ACPI processor enumeration support
14 #include <linux/device.h>
39 		return -EINVAL;  in acpi_processor_errata_piix4()
45 	switch (dev->revision) {  in acpi_processor_errata_piix4()
47 		dev_dbg(&dev->dev, "Found PIIX4 A-step\n");  in acpi_processor_errata_piix4()
50 		dev_dbg(&dev->dev, "Found PIIX4 B-step\n");  in acpi_processor_errata_piix4()
53 		dev_dbg(&dev->dev, "Found PIIX4E\n");  in acpi_processor_errata_piix4()
56 		dev_dbg(&dev->dev, "Found PIIX4M\n");  in acpi_processor_errata_piix4()
59 		dev_dbg(&dev->dev, "Found unknown PIIX4\n");  in acpi_processor_errata_piix4()
63 	switch (dev->revision) {  in acpi_processor_errata_piix4()
65 	case 0:		/* PIIX4 A-step */  in acpi_processor_errata_piix4()
66 	case 1:		/* PIIX4 B-step */  in acpi_processor_errata_piix4()
80 		 * See erratum #18 ("C3 Power State/BMIDE and Type-F DMA  in acpi_processor_errata_piix4()
86 		 * BM-IDE  in acpi_processor_errata_piix4()
87 		 * ------  in acpi_processor_errata_piix4()
102 		 * Type-F DMA  in acpi_processor_errata_piix4()
103 		 * ----------  in acpi_processor_errata_piix4()
105 		 * DMA controller's status to see if Type-F (Fast) DMA mode  in acpi_processor_errata_piix4()
125 		dev_dbg(&dev->dev, "Bus master activity detection (BM-IDE) erratum enabled\n");  in acpi_processor_errata_piix4()
127 		dev_dbg(&dev->dev, "Type-F DMA livelock erratum (C3 disabled)\n");  in acpi_processor_errata_piix4()
153 int __weak acpi_map_cpu(acpi_handle handle,  in acpi_map_cpu()  argument
156 	return -ENODEV;  in acpi_map_cpu()
161 	return -ENODEV;  in acpi_unmap_cpu()
166 	return -ENODEV;  in arch_register_cpu()
177 	if (invalid_phys_cpuid(pr->phys_id))  in acpi_processor_hotadd_init()
178 		return -ENODEV;  in acpi_processor_hotadd_init()
180 	status = acpi_evaluate_integer(pr->handle, "_STA", NULL, &sta);  in acpi_processor_hotadd_init()
182 		return -ENODEV;  in acpi_processor_hotadd_init()
187 	ret = acpi_map_cpu(pr->handle, pr->phys_id, pr->acpi_id, &pr->id);  in acpi_processor_hotadd_init()
191 	ret = arch_register_cpu(pr->id);  in acpi_processor_hotadd_init()
193 		acpi_unmap_cpu(pr->id);  in acpi_processor_hotadd_init()
198 	 * CPU got hot-added, but cpu_data is not initialized yet.  Set a flag  in acpi_processor_hotadd_init()
202 	pr_info("CPU%d has been hot-added\n", pr->id);  in acpi_processor_hotadd_init()
203 	pr->flags.need_hotplug_init = 1;  in acpi_processor_hotadd_init()
213 	return -ENODEV;  in acpi_processor_hotadd_init()
217 static int acpi_processor_get_info(struct acpi_device *device)  in acpi_processor_get_info()  argument
221 	struct acpi_processor *pr = acpi_driver_data(device);  in acpi_processor_get_info()
234 		pr->flags.bm_control = 1;  in acpi_processor_get_info()
235 		dev_dbg(&device->dev, "Bus mastering arbitration control present\n");  in acpi_processor_get_info()
237 		dev_dbg(&device->dev, "No bus mastering arbitration control\n");  in acpi_processor_get_info()
239 	if (!strcmp(acpi_device_hid(device), ACPI_PROCESSOR_OBJECT_HID)) {  in acpi_processor_get_info()
241 		status = acpi_evaluate_object(pr->handle, NULL, NULL, &buffer);  in acpi_processor_get_info()
243 			dev_err(&device->dev,  in acpi_processor_get_info()
246 			return -ENODEV;  in acpi_processor_get_info()
249 		pr->acpi_id = object.processor.proc_id;  in acpi_processor_get_info()
252 		 * Declared with "Device" statement; match _UID.  in acpi_processor_get_info()
254 		status = acpi_evaluate_integer(pr->handle, METHOD_NAME__UID,  in acpi_processor_get_info()
257 			dev_err(&device->dev,  in acpi_processor_get_info()
260 			return -ENODEV;  in acpi_processor_get_info()
263 		pr->acpi_id = value;  in acpi_processor_get_info()
266 	if (acpi_duplicate_processor_id(pr->acpi_id)) {  in acpi_processor_get_info()
267 		if (pr->acpi_id == 0xff)  in acpi_processor_get_info()
268 			dev_info_once(&device->dev,  in acpi_processor_get_info()
269 				"Entry not well-defined, consider updating BIOS\n");  in acpi_processor_get_info()
271 			dev_err(&device->dev,  in acpi_processor_get_info()
273 				pr->acpi_id);  in acpi_processor_get_info()
274 		return -ENODEV;  in acpi_processor_get_info()
277 	pr->phys_id = acpi_get_phys_id(pr->handle, device_declaration,  in acpi_processor_get_info()
278 					pr->acpi_id);  in acpi_processor_get_info()
279 	if (invalid_phys_cpuid(pr->phys_id))  in acpi_processor_get_info()
280 		dev_dbg(&device->dev, "Failed to get CPU physical ID.\n");  in acpi_processor_get_info()
282 	pr->id = acpi_map_cpuid(pr->phys_id, pr->acpi_id);  in acpi_processor_get_info()
286 		 * Handle UP system running SMP kernel, with no CPU  in acpi_processor_get_info()
289 		if (invalid_logical_cpuid(pr->id) && (num_online_cpus() == 1))  in acpi_processor_get_info()
290 			pr->id = 0;  in acpi_processor_get_info()
299 	 *  because cpuid <-> apicid mapping is persistent now.  in acpi_processor_get_info()
301 	if (invalid_logical_cpuid(pr->id) || !cpu_present(pr->id)) {  in acpi_processor_get_info()
313 	 * Rename the processor device bus id. And the new bus id will be  in acpi_processor_get_info()
317 	sprintf(acpi_device_bid(device), "CPU%X", pr->id);  in acpi_processor_get_info()
318 	dev_dbg(&device->dev, "Processor [%d:%d]\n", pr->id, pr->acpi_id);  in acpi_processor_get_info()
321 		dev_dbg(&device->dev, "No PBLK (NULL address)\n");  in acpi_processor_get_info()
323 		dev_err(&device->dev, "Invalid PBLK length [%d]\n",  in acpi_processor_get_info()
326 		pr->throttling.address = object.processor.pblk_address;  in acpi_processor_get_info()
327 		pr->throttling.duty_offset = acpi_gbl_FADT.duty_offset;  in acpi_processor_get_info()
328 		pr->throttling.duty_width = acpi_gbl_FADT.duty_width;  in acpi_processor_get_info()
330 		pr->pblk = object.processor.pblk_address;  in acpi_processor_get_info()
338 	status = acpi_evaluate_integer(pr->handle, "_SUN", NULL, &value);  in acpi_processor_get_info()
340 		arch_fix_phys_package_id(pr->id, value);  in acpi_processor_get_info()
353 static int acpi_processor_add(struct acpi_device *device,  in acpi_processor_add()  argument
357 	struct device *dev;  in acpi_processor_add()
362 		return -ENOMEM;  in acpi_processor_add()
364 	if (!zalloc_cpumask_var(&pr->throttling.shared_cpu_map, GFP_KERNEL)) {  in acpi_processor_add()
365 		result = -ENOMEM;  in acpi_processor_add()
369 	pr->handle = device->handle;  in acpi_processor_add()
370 	strcpy(acpi_device_name(device), ACPI_PROCESSOR_DEVICE_NAME);  in acpi_processor_add()
371 	strcpy(acpi_device_class(device), ACPI_PROCESSOR_CLASS);  in acpi_processor_add()
372 	device->driver_data = pr;  in acpi_processor_add()
374 	result = acpi_processor_get_info(device);  in acpi_processor_add()
378 	BUG_ON(pr->id >= nr_cpu_ids);  in acpi_processor_add()
385 	if (per_cpu(processor_device_array, pr->id) != NULL &&  in acpi_processor_add()
386 	    per_cpu(processor_device_array, pr->id) != device) {  in acpi_processor_add()
387 		dev_warn(&device->dev,  in acpi_processor_add()
389 			pr->id);  in acpi_processor_add()
397 	per_cpu(processor_device_array, pr->id) = device;  in acpi_processor_add()
398 	per_cpu(processors, pr->id) = pr;  in acpi_processor_add()
400 	dev = get_cpu_device(pr->id);  in acpi_processor_add()
402 		result = -ENODEV;  in acpi_processor_add()
406 	result = acpi_bind_one(dev, device);  in acpi_processor_add()
410 	pr->dev = dev;  in acpi_processor_add()
420 	free_cpumask_var(pr->throttling.shared_cpu_map);  in acpi_processor_add()
421 	device->driver_data = NULL;  in acpi_processor_add()
422 	per_cpu(processors, pr->id) = NULL;  in acpi_processor_add()
430 static void acpi_processor_remove(struct acpi_device *device)  in acpi_processor_remove()  argument
434 	if (!device || !acpi_driver_data(device))  in acpi_processor_remove()
437 	pr = acpi_driver_data(device);  in acpi_processor_remove()
438 	if (pr->id >= nr_cpu_ids)  in acpi_processor_remove()
442 	 * The only reason why we ever get here is CPU hot-removal.  The CPU is  in acpi_processor_remove()
443 	 * already offline and the ACPI device removal locking prevents it from  in acpi_processor_remove()
446 	 * Unbind the driver from the processor device and detach it from the  in acpi_processor_remove()
449 	device_release_driver(pr->dev);  in acpi_processor_remove()
450 	acpi_unbind_one(pr->dev);  in acpi_processor_remove()
453 	per_cpu(processor_device_array, pr->id) = NULL;  in acpi_processor_remove()
454 	per_cpu(processors, pr->id) = NULL;  in acpi_processor_remove()
460 	arch_unregister_cpu(pr->id);  in acpi_processor_remove()
461 	acpi_unmap_cpu(pr->id);  in acpi_processor_remove()
466 	try_offline_node(cpu_to_node(pr->id));  in acpi_processor_remove()
469 	free_cpumask_var(pr->throttling.shared_cpu_map);  in acpi_processor_remove()
476 static acpi_status __init acpi_hwp_native_thermal_lvt_osc(acpi_handle handle,  in acpi_hwp_native_thermal_lvt_osc()  argument
481 	u8 sb_uuid_str[] = "4077A616-290C-47BE-9EBD-D87058713953";  in acpi_hwp_native_thermal_lvt_osc()
496 	if (ACPI_SUCCESS(acpi_run_osc(handle, &osc_context))) {  in acpi_hwp_native_thermal_lvt_osc()
501 				acpi_handle_info(handle,  in acpi_hwp_native_thermal_lvt_osc()
573 	[0 ... NR_CPUS - 1] = -1,
578 	[0 ... NR_CPUS - 1] = -1,
616 static acpi_status __init acpi_processor_ids_walk(acpi_handle handle,  in acpi_processor_ids_walk()  argument
627 	status = acpi_get_type(handle, &acpi_type);  in acpi_processor_ids_walk()
633 		status = acpi_evaluate_object(handle, NULL, NULL, &buffer);  in acpi_processor_ids_walk()
640 		status = acpi_evaluate_integer(handle, "_UID", NULL, &uid);  in acpi_processor_ids_walk()
653 	acpi_handle_info(handle, "Invalid processor object\n");  in acpi_processor_ids_walk()
693  * acpi_processor_claim_cst_control - Request _CST control from the platform.
716  * acpi_processor_evaluate_cst - Evaluate the processor _CST control method.
717  * @handle: ACPI handle of the processor object containing the _CST.
719  * @info: Object write the C-states information into.
721  * Extract the C-state information for the given CPU from the output of the _CST
723  * device object) and populate @info with it.
725  * If any ACPI_ADR_SPACE_FIXED_HARDWARE C-states are found, invoke
729 int acpi_processor_evaluate_cst(acpi_handle handle, u32 cpu,  in acpi_processor_evaluate_cst()  argument
739 	status = acpi_evaluate_object(handle, "_CST", NULL, &buffer);  in acpi_processor_evaluate_cst()
741 		acpi_handle_debug(handle, "No _CST\n");  in acpi_processor_evaluate_cst()
742 		return -ENODEV;  in acpi_processor_evaluate_cst()
748 	if (!cst || cst->type != ACPI_TYPE_PACKAGE || cst->package.count < 2) {  in acpi_processor_evaluate_cst()
749 		acpi_handle_warn(handle, "Invalid _CST output\n");  in acpi_processor_evaluate_cst()
750 		ret = -EFAULT;  in acpi_processor_evaluate_cst()
754 	count = cst->package.elements[0].integer.value;  in acpi_processor_evaluate_cst()
756 	/* Validate the number of C-states. */  in acpi_processor_evaluate_cst()
757 	if (count < 1 || count != cst->package.count - 1) {  in acpi_processor_evaluate_cst()
758 		acpi_handle_warn(handle, "Inconsistent _CST data\n");  in acpi_processor_evaluate_cst()
759 		ret = -EFAULT;  in acpi_processor_evaluate_cst()
770 		 * If there is not enough space for all C-states, skip the  in acpi_processor_evaluate_cst()
773 		if (last_index >= ACPI_PROCESSOR_MAX_POWER - 1) {  in acpi_processor_evaluate_cst()
774 			acpi_handle_warn(handle,  in acpi_processor_evaluate_cst()
776 					 ACPI_PROCESSOR_MAX_POWER - 1);  in acpi_processor_evaluate_cst()
782 		element = &cst->package.elements[i];  in acpi_processor_evaluate_cst()
783 		if (element->type != ACPI_TYPE_PACKAGE) {  in acpi_processor_evaluate_cst()
784 			acpi_handle_info(handle, "_CST C%d type(%x) is not package, skip...\n",  in acpi_processor_evaluate_cst()
785 					 i, element->type);  in acpi_processor_evaluate_cst()
789 		if (element->package.count != 4) {  in acpi_processor_evaluate_cst()
790 			acpi_handle_info(handle, "_CST C%d package count(%d) is not 4, skip...\n",  in acpi_processor_evaluate_cst()
791 					 i, element->package.count);  in acpi_processor_evaluate_cst()
795 		obj = &element->package.elements[0];  in acpi_processor_evaluate_cst()
797 		if (obj->type != ACPI_TYPE_BUFFER) {  in acpi_processor_evaluate_cst()
798 			acpi_handle_info(handle, "_CST C%d package element[0] type(%x) is not buffer, skip...\n",  in acpi_processor_evaluate_cst()
799 					 i, obj->type);  in acpi_processor_evaluate_cst()
803 		reg = (struct acpi_power_register *)obj->buffer.pointer;  in acpi_processor_evaluate_cst()
805 		obj = &element->package.elements[1];  in acpi_processor_evaluate_cst()
806 		if (obj->type != ACPI_TYPE_INTEGER) {  in acpi_processor_evaluate_cst()
807 			acpi_handle_info(handle, "_CST C[%d] package element[1] type(%x) is not integer, skip...\n",  in acpi_processor_evaluate_cst()
808 					 i, obj->type);  in acpi_processor_evaluate_cst()
812 		cx.type = obj->integer.value;  in acpi_processor_evaluate_cst()
821 		cx.address = reg->address;  in acpi_processor_evaluate_cst()
824 		if (reg->space_id == ACPI_ADR_SPACE_FIXED_HARDWARE) {  in acpi_processor_evaluate_cst()
828 				 * a FIXED_HARDWARE C-state, but if the command  in acpi_processor_evaluate_cst()
847 …acpi_handle_info(handle, "_CST C%d declares FIXED_HARDWARE C-state but not supported in hardware, …  in acpi_processor_evaluate_cst()
851 		} else if (reg->space_id == ACPI_ADR_SPACE_SYSTEM_IO) {  in acpi_processor_evaluate_cst()
856 			acpi_handle_info(handle, "_CST C%d space_id(%x) neither FIXED_HARDWARE nor SYSTEM_IO, skip...\n",  in acpi_processor_evaluate_cst()
857 					 i, reg->space_id);  in acpi_processor_evaluate_cst()
864 		obj = &element->package.elements[2];  in acpi_processor_evaluate_cst()
865 		if (obj->type != ACPI_TYPE_INTEGER) {  in acpi_processor_evaluate_cst()
866 			acpi_handle_info(handle, "_CST C%d package element[2] type(%x) not integer, skip...\n",  in acpi_processor_evaluate_cst()
867 					 i, obj->type);  in acpi_processor_evaluate_cst()
871 		cx.latency = obj->integer.value;  in acpi_processor_evaluate_cst()
873 		obj = &element->package.elements[3];  in acpi_processor_evaluate_cst()
874 		if (obj->type != ACPI_TYPE_INTEGER) {  in acpi_processor_evaluate_cst()
875 			acpi_handle_info(handle, "_CST C%d package element[3] type(%x) not integer, skip...\n",  in acpi_processor_evaluate_cst()
876 					 i, obj->type);  in acpi_processor_evaluate_cst()
880 		memcpy(&info->states[++last_index], &cx, sizeof(cx));  in acpi_processor_evaluate_cst()
883 	acpi_handle_info(handle, "Found %d idle states\n", last_index);  in acpi_processor_evaluate_cst()
885 	info->count = last_index;  in acpi_processor_evaluate_cst()