1 // SPDX-License-Identifier: GPL-2.0-or-later
29 /* --------------------------------------------------------------------------
31 -------------------------------------------------------------------------- */
33 static int xen_acpi_processor_enable(struct acpi_device *device)  in xen_acpi_processor_enable()  argument
39 	struct acpi_processor *pr = acpi_driver_data(device);  in xen_acpi_processor_enable()
41 	if (!strcmp(acpi_device_hid(device), ACPI_PROCESSOR_OBJECT_HID)) {  in xen_acpi_processor_enable()
43 		status = acpi_evaluate_object(pr->handle, NULL, NULL, &buffer);  in xen_acpi_processor_enable()
46 			return -ENODEV;  in xen_acpi_processor_enable()
49 		pr->acpi_id = object.processor.proc_id;  in xen_acpi_processor_enable()
51 		/* Declared with "Device" statement; match _UID */  in xen_acpi_processor_enable()
52 		status = acpi_evaluate_integer(pr->handle, METHOD_NAME__UID,  in xen_acpi_processor_enable()
56 			return -ENODEV;  in xen_acpi_processor_enable()
59 		pr->acpi_id = value;  in xen_acpi_processor_enable()
62 	pr->id = xen_pcpu_id(pr->acpi_id);  in xen_acpi_processor_enable()
64 	if (invalid_logical_cpuid(pr->id))  in xen_acpi_processor_enable()
68 					pr->acpi_id);  in xen_acpi_processor_enable()
69 			return -ENODEV;  in xen_acpi_processor_enable()
75 static int xen_acpi_processor_add(struct acpi_device *device)  in xen_acpi_processor_add()  argument
80 	if (!device)  in xen_acpi_processor_add()
81 		return -EINVAL;  in xen_acpi_processor_add()
85 		return -ENOMEM;  in xen_acpi_processor_add()
87 	pr->handle = device->handle;  in xen_acpi_processor_add()
88 	strcpy(acpi_device_name(device), ACPI_PROCESSOR_DEVICE_NAME);  in xen_acpi_processor_add()
89 	strcpy(acpi_device_class(device), ACPI_PROCESSOR_CLASS);  in xen_acpi_processor_add()
90 	device->driver_data = pr;  in xen_acpi_processor_add()
92 	ret = xen_acpi_processor_enable(device);  in xen_acpi_processor_add()
99 static int xen_acpi_processor_remove(struct acpi_device *device)  in xen_acpi_processor_remove()  argument
103 	if (!device)  in xen_acpi_processor_remove()
104 		return -EINVAL;  in xen_acpi_processor_remove()
106 	pr = acpi_driver_data(device);  in xen_acpi_processor_remove()
108 		return -EINVAL;  in xen_acpi_processor_remove()
114 /*--------------------------------------------------------------
116 --------------------------------------------------------------*/
118 static int is_processor_present(acpi_handle handle)  in is_processor_present()  argument
124 	status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);  in is_processor_present()
135 		pr_info(PREFIX "Processor Device is not present");  in is_processor_present()
139 static int xen_apic_id(acpi_handle handle)  in xen_apic_id()  argument
146 	if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))  in xen_apic_id()
147 		return -EINVAL;  in xen_apic_id()
150 		return -EINVAL;  in xen_apic_id()
153 	if (obj->type != ACPI_TYPE_BUFFER ||  in xen_apic_id()
154 	    obj->buffer.length < sizeof(*lapic)) {  in xen_apic_id()
156 		return -EINVAL;  in xen_apic_id()
159 	lapic = (struct acpi_madt_local_apic *)obj->buffer.pointer;  in xen_apic_id()
161 	if (lapic->header.type != ACPI_MADT_TYPE_LOCAL_APIC ||  in xen_apic_id()
162 	    !(lapic->lapic_flags & ACPI_MADT_ENABLED)) {  in xen_apic_id()
164 		return -EINVAL;  in xen_apic_id()
167 	apic_id = (uint32_t)lapic->id;  in xen_apic_id()
180 	apic_id = xen_apic_id(pr->handle);  in xen_hotadd_cpu()
183 				pr->acpi_id);  in xen_hotadd_cpu()
184 		return -ENODEV;  in xen_hotadd_cpu()
187 	pxm = xen_acpi_get_pxm(pr->handle);  in xen_hotadd_cpu()
190 				pr->acpi_id);  in xen_hotadd_cpu()
196 	op.u.cpu_add.acpi_id = pr->acpi_id;  in xen_hotadd_cpu()
202 				pr->acpi_id);  in xen_hotadd_cpu()
209 	if (!is_processor_present(pr->handle))  in xen_acpi_cpu_hotadd()
212 	pr->id = xen_hotadd_cpu(pr);  in xen_acpi_cpu_hotadd()
213 	if (invalid_logical_cpuid(pr->id))  in xen_acpi_cpu_hotadd()
225 static int acpi_processor_device_remove(struct acpi_device *device)  in acpi_processor_device_remove()  argument
229 	return -ENOSYS;  in acpi_processor_device_remove()
232 static void acpi_processor_hotplug_notify(acpi_handle handle,  in acpi_processor_hotplug_notify()  argument
236 	struct acpi_device *device = NULL;  in acpi_processor_hotplug_notify()  local
250 		if (!is_processor_present(handle))  in acpi_processor_hotplug_notify()
253 		acpi_bus_get_device(handle, &device);  in acpi_processor_hotplug_notify()
254 		if (acpi_device_enumerated(device))  in acpi_processor_hotplug_notify()
257 		result = acpi_bus_scan(handle);  in acpi_processor_hotplug_notify()
259 			pr_err(PREFIX "Unable to add the device\n");  in acpi_processor_hotplug_notify()
262 		device = NULL;  in acpi_processor_hotplug_notify()
263 		acpi_bus_get_device(handle, &device);  in acpi_processor_hotplug_notify()
264 		if (!acpi_device_enumerated(device)) {  in acpi_processor_hotplug_notify()
265 			pr_err(PREFIX "Missing device object\n");  in acpi_processor_hotplug_notify()
275 		if (acpi_bus_get_device(handle, &device)) {  in acpi_processor_hotplug_notify()
276 			pr_err(PREFIX "Device don't exist, dropping EJECT\n");  in acpi_processor_hotplug_notify()
279 		pr = acpi_driver_data(device);  in acpi_processor_hotplug_notify()
289 		acpi_processor_device_remove(device);  in acpi_processor_hotplug_notify()
296 		/* non-hotplug event; possibly handled by other handler */  in acpi_processor_hotplug_notify()
300 	(void) acpi_evaluate_ost(handle, event, ost_code, NULL);  in acpi_processor_hotplug_notify()
306 static acpi_status is_processor_device(acpi_handle handle)  in is_processor_device()  argument
312 	status = acpi_get_object_info(handle, &info);  in is_processor_device()
316 	if (info->type == ACPI_TYPE_PROCESSOR) {  in is_processor_device()
321 	if (!(info->valid & ACPI_VALID_HID)) {  in is_processor_device()
326 	hid = info->hardware_id.string;  in is_processor_device()
333 	return AE_OK;	/* found a processor device object */  in is_processor_device()
337 processor_walk_namespace_cb(acpi_handle handle,  in processor_walk_namespace_cb()  argument
343 	status = is_processor_device(handle);  in processor_walk_namespace_cb()
349 		acpi_install_notify_handler(handle,  in processor_walk_namespace_cb()
355 		acpi_remove_notify_handler(handle,  in processor_walk_namespace_cb()
409 		return -ENODEV;  in xen_acpi_processor_init()
443 ACPI_MODULE_NAME("xen-acpi-cpuhotplug");