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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * processor_driver.c - ACPI Processor Driver
4 *
5 * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
6 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
7 * Copyright (C) 2004 Dominik Brodowski <linux@brodo.de>
8 * Copyright (C) 2004 Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
9 * - Added processor hotplug support
10 * Copyright (C) 2013, Intel Corporation
11 * Rafael J. Wysocki <rafael.j.wysocki@intel.com>
12 */
13
14#include <linux/kernel.h>
15#include <linux/module.h>
16#include <linux/init.h>
17#include <linux/cpufreq.h>
18#include <linux/cpu.h>
19#include <linux/cpuidle.h>
20#include <linux/slab.h>
21#include <linux/acpi.h>
22
23#include <acpi/processor.h>
24
25#include "internal.h"
26
27#define ACPI_PROCESSOR_NOTIFY_PERFORMANCE 0x80
28#define ACPI_PROCESSOR_NOTIFY_POWER 0x81
29#define ACPI_PROCESSOR_NOTIFY_THROTTLING 0x82
30
31#define _COMPONENT ACPI_PROCESSOR_COMPONENT
32ACPI_MODULE_NAME("processor_driver");
33
34MODULE_AUTHOR("Paul Diefenbaugh");
35MODULE_DESCRIPTION("ACPI Processor Driver");
36MODULE_LICENSE("GPL");
37
38static int acpi_processor_start(struct device *dev);
39static int acpi_processor_stop(struct device *dev);
40
41static const struct acpi_device_id processor_device_ids[] = {
42 {ACPI_PROCESSOR_OBJECT_HID, 0},
43 {ACPI_PROCESSOR_DEVICE_HID, 0},
44 {"", 0},
45};
46MODULE_DEVICE_TABLE(acpi, processor_device_ids);
47
48static struct device_driver acpi_processor_driver = {
49 .name = "processor",
50 .bus = &cpu_subsys,
51 .acpi_match_table = processor_device_ids,
52 .probe = acpi_processor_start,
53 .remove = acpi_processor_stop,
54};
55
56static void acpi_processor_notify(acpi_handle handle, u32 event, void *data)
57{
58 struct acpi_device *device = data;
59 struct acpi_processor *pr;
60 int saved;
61
62 if (device->handle != handle)
63 return;
64
65 pr = acpi_driver_data(device);
66 if (!pr)
67 return;
68
69 switch (event) {
70 case ACPI_PROCESSOR_NOTIFY_PERFORMANCE:
71 saved = pr->performance_platform_limit;
72 acpi_processor_ppc_has_changed(pr, 1);
73 if (saved == pr->performance_platform_limit)
74 break;
75 acpi_bus_generate_netlink_event(device->pnp.device_class,
76 dev_name(&device->dev), event,
77 pr->performance_platform_limit);
78 break;
79 case ACPI_PROCESSOR_NOTIFY_POWER:
80 acpi_processor_power_state_has_changed(pr);
81 acpi_bus_generate_netlink_event(device->pnp.device_class,
82 dev_name(&device->dev), event, 0);
83 break;
84 case ACPI_PROCESSOR_NOTIFY_THROTTLING:
85 acpi_processor_tstate_has_changed(pr);
86 acpi_bus_generate_netlink_event(device->pnp.device_class,
87 dev_name(&device->dev), event, 0);
88 break;
89 default:
90 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
91 "Unsupported event [0x%x]\n", event));
92 break;
93 }
94
95 return;
96}
97
98static int __acpi_processor_start(struct acpi_device *device);
99
100static int acpi_soft_cpu_online(unsigned int cpu)
101{
102 struct acpi_processor *pr = per_cpu(processors, cpu);
103 struct acpi_device *device;
104
105 if (!pr || acpi_bus_get_device(pr->handle, &device))
106 return 0;
107 /*
108 * CPU got physically hotplugged and onlined for the first time:
109 * Initialize missing things.
110 */
111 if (pr->flags.need_hotplug_init) {
112 int ret;
113
114 pr_info("Will online and init hotplugged CPU: %d\n",
115 pr->id);
116 pr->flags.need_hotplug_init = 0;
117 ret = __acpi_processor_start(device);
118 WARN(ret, "Failed to start CPU: %d\n", pr->id);
119 } else {
120 /* Normal CPU soft online event. */
121 acpi_processor_ppc_has_changed(pr, 0);
122 acpi_processor_hotplug(pr);
123 acpi_processor_reevaluate_tstate(pr, false);
124 acpi_processor_tstate_has_changed(pr);
125 }
126 return 0;
127}
128
129static int acpi_soft_cpu_dead(unsigned int cpu)
130{
131 struct acpi_processor *pr = per_cpu(processors, cpu);
132 struct acpi_device *device;
133
134 if (!pr || acpi_bus_get_device(pr->handle, &device))
135 return 0;
136
137 acpi_processor_reevaluate_tstate(pr, true);
138 return 0;
139}
140
141#ifdef CONFIG_ACPI_CPU_FREQ_PSS
142static int acpi_pss_perf_init(struct acpi_processor *pr,
143 struct acpi_device *device)
144{
145 int result = 0;
146
147 acpi_processor_ppc_has_changed(pr, 0);
148
149 acpi_processor_get_throttling_info(pr);
150
151 if (pr->flags.throttling)
152 pr->flags.limit = 1;
153
154 pr->cdev = thermal_cooling_device_register("Processor", device,
155 &processor_cooling_ops);
156 if (IS_ERR(pr->cdev)) {
157 result = PTR_ERR(pr->cdev);
158 return result;
159 }
160
161 dev_dbg(&device->dev, "registered as cooling_device%d\n",
162 pr->cdev->id);
163
164 result = sysfs_create_link(&device->dev.kobj,
165 &pr->cdev->device.kobj,
166 "thermal_cooling");
167 if (result) {
168 dev_err(&device->dev,
169 "Failed to create sysfs link 'thermal_cooling'\n");
170 goto err_thermal_unregister;
171 }
172
173 result = sysfs_create_link(&pr->cdev->device.kobj,
174 &device->dev.kobj,
175 "device");
176 if (result) {
177 dev_err(&pr->cdev->device,
178 "Failed to create sysfs link 'device'\n");
179 goto err_remove_sysfs_thermal;
180 }
181
182 return 0;
183
184 err_remove_sysfs_thermal:
185 sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
186 err_thermal_unregister:
187 thermal_cooling_device_unregister(pr->cdev);
188
189 return result;
190}
191
192static void acpi_pss_perf_exit(struct acpi_processor *pr,
193 struct acpi_device *device)
194{
195 if (pr->cdev) {
196 sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
197 sysfs_remove_link(&pr->cdev->device.kobj, "device");
198 thermal_cooling_device_unregister(pr->cdev);
199 pr->cdev = NULL;
200 }
201}
202#else
203static inline int acpi_pss_perf_init(struct acpi_processor *pr,
204 struct acpi_device *device)
205{
206 return 0;
207}
208
209static inline void acpi_pss_perf_exit(struct acpi_processor *pr,
210 struct acpi_device *device) {}
211#endif /* CONFIG_ACPI_CPU_FREQ_PSS */
212
213static int __acpi_processor_start(struct acpi_device *device)
214{
215 struct acpi_processor *pr = acpi_driver_data(device);
216 acpi_status status;
217 int result = 0;
218
219 if (!pr)
220 return -ENODEV;
221
222 if (pr->flags.need_hotplug_init)
223 return 0;
224
225 result = acpi_cppc_processor_probe(pr);
226 if (result && !IS_ENABLED(CONFIG_ACPI_CPU_FREQ_PSS))
227 dev_dbg(&device->dev, "CPPC data invalid or not present\n");
228
229 if (!cpuidle_get_driver() || cpuidle_get_driver() == &acpi_idle_driver)
230 acpi_processor_power_init(pr);
231
232 result = acpi_pss_perf_init(pr, device);
233 if (result)
234 goto err_power_exit;
235
236 status = acpi_install_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
237 acpi_processor_notify, device);
238 if (ACPI_SUCCESS(status))
239 return 0;
240
241 result = -ENODEV;
242 acpi_pss_perf_exit(pr, device);
243
244err_power_exit:
245 acpi_processor_power_exit(pr);
246 return result;
247}
248
249static int acpi_processor_start(struct device *dev)
250{
251 struct acpi_device *device = ACPI_COMPANION(dev);
252 int ret;
253
254 if (!device)
255 return -ENODEV;
256
257 /* Protect against concurrent CPU hotplug operations */
258 cpu_hotplug_disable();
259 ret = __acpi_processor_start(device);
260 cpu_hotplug_enable();
261 return ret;
262}
263
264static int acpi_processor_stop(struct device *dev)
265{
266 struct acpi_device *device = ACPI_COMPANION(dev);
267 struct acpi_processor *pr;
268
269 if (!device)
270 return 0;
271
272 acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
273 acpi_processor_notify);
274
275 pr = acpi_driver_data(device);
276 if (!pr)
277 return 0;
278 acpi_processor_power_exit(pr);
279
280 acpi_pss_perf_exit(pr, device);
281
282 acpi_cppc_processor_exit(pr);
283
284 return 0;
285}
286
287bool acpi_processor_cpufreq_init;
288
289static int acpi_processor_notifier(struct notifier_block *nb,
290 unsigned long event, void *data)
291{
292 struct cpufreq_policy *policy = data;
293
294 if (event == CPUFREQ_CREATE_POLICY) {
295 acpi_thermal_cpufreq_init(policy);
296 acpi_processor_ppc_init(policy);
297 } else if (event == CPUFREQ_REMOVE_POLICY) {
298 acpi_processor_ppc_exit(policy);
299 acpi_thermal_cpufreq_exit(policy);
300 }
301
302 return 0;
303}
304
305static struct notifier_block acpi_processor_notifier_block = {
306 .notifier_call = acpi_processor_notifier,
307};
308
309/*
310 * We keep the driver loaded even when ACPI is not running.
311 * This is needed for the powernow-k8 driver, that works even without
312 * ACPI, but needs symbols from this driver
313 */
314static enum cpuhp_state hp_online;
315static int __init acpi_processor_driver_init(void)
316{
317 int result = 0;
318
319 if (acpi_disabled)
320 return 0;
321
322 result = driver_register(&acpi_processor_driver);
323 if (result < 0)
324 return result;
325
326 result = cpuhp_setup_state_nocalls(CPUHP_AP_ONLINE_DYN,
327 "acpi/cpu-drv:online",
328 acpi_soft_cpu_online, NULL);
329 if (result < 0)
330 goto err;
331 hp_online = result;
332 cpuhp_setup_state_nocalls(CPUHP_ACPI_CPUDRV_DEAD, "acpi/cpu-drv:dead",
333 NULL, acpi_soft_cpu_dead);
334
335 if (!cpufreq_register_notifier(&acpi_processor_notifier_block,
336 CPUFREQ_POLICY_NOTIFIER)) {
337 acpi_processor_cpufreq_init = true;
338 acpi_processor_ignore_ppc_init();
339 }
340
341 acpi_processor_throttling_init();
342 return 0;
343err:
344 driver_unregister(&acpi_processor_driver);
345 return result;
346}
347
348static void __exit acpi_processor_driver_exit(void)
349{
350 if (acpi_disabled)
351 return;
352
353 if (acpi_processor_cpufreq_init) {
354 cpufreq_unregister_notifier(&acpi_processor_notifier_block,
355 CPUFREQ_POLICY_NOTIFIER);
356 acpi_processor_cpufreq_init = false;
357 }
358
359 cpuhp_remove_state_nocalls(hp_online);
360 cpuhp_remove_state_nocalls(CPUHP_ACPI_CPUDRV_DEAD);
361 driver_unregister(&acpi_processor_driver);
362}
363
364module_init(acpi_processor_driver_init);
365module_exit(acpi_processor_driver_exit);
366
367MODULE_ALIAS("processor");
1/*
2 * acpi_processor.c - ACPI Processor Driver ($Revision: 71 $)
3 *
4 * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
5 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
6 * Copyright (C) 2004 Dominik Brodowski <linux@brodo.de>
7 * Copyright (C) 2004 Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
8 * - Added processor hotplug support
9 *
10 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
11 *
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2 of the License, or (at
15 * your option) any later version.
16 *
17 * This program is distributed in the hope that it will be useful, but
18 * WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
20 * General Public License for more details.
21 *
22 * You should have received a copy of the GNU General Public License along
23 * with this program; if not, write to the Free Software Foundation, Inc.,
24 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
25 *
26 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
27 * TBD:
28 * 1. Make # power states dynamic.
29 * 2. Support duty_cycle values that span bit 4.
30 * 3. Optimize by having scheduler determine business instead of
31 * having us try to calculate it here.
32 * 4. Need C1 timing -- must modify kernel (IRQ handler) to get this.
33 */
34
35#include <linux/kernel.h>
36#include <linux/module.h>
37#include <linux/init.h>
38#include <linux/types.h>
39#include <linux/pci.h>
40#include <linux/pm.h>
41#include <linux/cpufreq.h>
42#include <linux/cpu.h>
43#include <linux/dmi.h>
44#include <linux/moduleparam.h>
45#include <linux/cpuidle.h>
46#include <linux/slab.h>
47
48#include <asm/io.h>
49#include <asm/system.h>
50#include <asm/cpu.h>
51#include <asm/delay.h>
52#include <asm/uaccess.h>
53#include <asm/processor.h>
54#include <asm/smp.h>
55#include <asm/acpi.h>
56
57#include <acpi/acpi_bus.h>
58#include <acpi/acpi_drivers.h>
59#include <acpi/processor.h>
60
61#define PREFIX "ACPI: "
62
63#define ACPI_PROCESSOR_CLASS "processor"
64#define ACPI_PROCESSOR_DEVICE_NAME "Processor"
65#define ACPI_PROCESSOR_FILE_INFO "info"
66#define ACPI_PROCESSOR_FILE_THROTTLING "throttling"
67#define ACPI_PROCESSOR_FILE_LIMIT "limit"
68#define ACPI_PROCESSOR_NOTIFY_PERFORMANCE 0x80
69#define ACPI_PROCESSOR_NOTIFY_POWER 0x81
70#define ACPI_PROCESSOR_NOTIFY_THROTTLING 0x82
71
72#define ACPI_PROCESSOR_LIMIT_USER 0
73#define ACPI_PROCESSOR_LIMIT_THERMAL 1
74
75#define _COMPONENT ACPI_PROCESSOR_COMPONENT
76ACPI_MODULE_NAME("processor_driver");
77
78MODULE_AUTHOR("Paul Diefenbaugh");
79MODULE_DESCRIPTION("ACPI Processor Driver");
80MODULE_LICENSE("GPL");
81
82static int acpi_processor_add(struct acpi_device *device);
83static int acpi_processor_remove(struct acpi_device *device, int type);
84static void acpi_processor_notify(struct acpi_device *device, u32 event);
85static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu);
86static int acpi_processor_handle_eject(struct acpi_processor *pr);
87
88
89static const struct acpi_device_id processor_device_ids[] = {
90 {ACPI_PROCESSOR_OBJECT_HID, 0},
91 {"ACPI0007", 0},
92 {"", 0},
93};
94MODULE_DEVICE_TABLE(acpi, processor_device_ids);
95
96static struct acpi_driver acpi_processor_driver = {
97 .name = "processor",
98 .class = ACPI_PROCESSOR_CLASS,
99 .ids = processor_device_ids,
100 .ops = {
101 .add = acpi_processor_add,
102 .remove = acpi_processor_remove,
103 .suspend = acpi_processor_suspend,
104 .resume = acpi_processor_resume,
105 .notify = acpi_processor_notify,
106 },
107};
108
109#define INSTALL_NOTIFY_HANDLER 1
110#define UNINSTALL_NOTIFY_HANDLER 2
111
112DEFINE_PER_CPU(struct acpi_processor *, processors);
113EXPORT_PER_CPU_SYMBOL(processors);
114
115struct acpi_processor_errata errata __read_mostly;
116
117/* --------------------------------------------------------------------------
118 Errata Handling
119 -------------------------------------------------------------------------- */
120
121static int acpi_processor_errata_piix4(struct pci_dev *dev)
122{
123 u8 value1 = 0;
124 u8 value2 = 0;
125
126
127 if (!dev)
128 return -EINVAL;
129
130 /*
131 * Note that 'dev' references the PIIX4 ACPI Controller.
132 */
133
134 switch (dev->revision) {
135 case 0:
136 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 A-step\n"));
137 break;
138 case 1:
139 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 B-step\n"));
140 break;
141 case 2:
142 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4E\n"));
143 break;
144 case 3:
145 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4M\n"));
146 break;
147 default:
148 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found unknown PIIX4\n"));
149 break;
150 }
151
152 switch (dev->revision) {
153
154 case 0: /* PIIX4 A-step */
155 case 1: /* PIIX4 B-step */
156 /*
157 * See specification changes #13 ("Manual Throttle Duty Cycle")
158 * and #14 ("Enabling and Disabling Manual Throttle"), plus
159 * erratum #5 ("STPCLK# Deassertion Time") from the January
160 * 2002 PIIX4 specification update. Applies to only older
161 * PIIX4 models.
162 */
163 errata.piix4.throttle = 1;
164
165 case 2: /* PIIX4E */
166 case 3: /* PIIX4M */
167 /*
168 * See erratum #18 ("C3 Power State/BMIDE and Type-F DMA
169 * Livelock") from the January 2002 PIIX4 specification update.
170 * Applies to all PIIX4 models.
171 */
172
173 /*
174 * BM-IDE
175 * ------
176 * Find the PIIX4 IDE Controller and get the Bus Master IDE
177 * Status register address. We'll use this later to read
178 * each IDE controller's DMA status to make sure we catch all
179 * DMA activity.
180 */
181 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
182 PCI_DEVICE_ID_INTEL_82371AB,
183 PCI_ANY_ID, PCI_ANY_ID, NULL);
184 if (dev) {
185 errata.piix4.bmisx = pci_resource_start(dev, 4);
186 pci_dev_put(dev);
187 }
188
189 /*
190 * Type-F DMA
191 * ----------
192 * Find the PIIX4 ISA Controller and read the Motherboard
193 * DMA controller's status to see if Type-F (Fast) DMA mode
194 * is enabled (bit 7) on either channel. Note that we'll
195 * disable C3 support if this is enabled, as some legacy
196 * devices won't operate well if fast DMA is disabled.
197 */
198 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
199 PCI_DEVICE_ID_INTEL_82371AB_0,
200 PCI_ANY_ID, PCI_ANY_ID, NULL);
201 if (dev) {
202 pci_read_config_byte(dev, 0x76, &value1);
203 pci_read_config_byte(dev, 0x77, &value2);
204 if ((value1 & 0x80) || (value2 & 0x80))
205 errata.piix4.fdma = 1;
206 pci_dev_put(dev);
207 }
208
209 break;
210 }
211
212 if (errata.piix4.bmisx)
213 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
214 "Bus master activity detection (BM-IDE) erratum enabled\n"));
215 if (errata.piix4.fdma)
216 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
217 "Type-F DMA livelock erratum (C3 disabled)\n"));
218
219 return 0;
220}
221
222static int acpi_processor_errata(struct acpi_processor *pr)
223{
224 int result = 0;
225 struct pci_dev *dev = NULL;
226
227
228 if (!pr)
229 return -EINVAL;
230
231 /*
232 * PIIX4
233 */
234 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
235 PCI_DEVICE_ID_INTEL_82371AB_3, PCI_ANY_ID,
236 PCI_ANY_ID, NULL);
237 if (dev) {
238 result = acpi_processor_errata_piix4(dev);
239 pci_dev_put(dev);
240 }
241
242 return result;
243}
244
245/* --------------------------------------------------------------------------
246 Driver Interface
247 -------------------------------------------------------------------------- */
248
249static int acpi_processor_get_info(struct acpi_device *device)
250{
251 acpi_status status = 0;
252 union acpi_object object = { 0 };
253 struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
254 struct acpi_processor *pr;
255 int cpu_index, device_declaration = 0;
256 static int cpu0_initialized;
257
258 pr = acpi_driver_data(device);
259 if (!pr)
260 return -EINVAL;
261
262 if (num_online_cpus() > 1)
263 errata.smp = TRUE;
264
265 acpi_processor_errata(pr);
266
267 /*
268 * Check to see if we have bus mastering arbitration control. This
269 * is required for proper C3 usage (to maintain cache coherency).
270 */
271 if (acpi_gbl_FADT.pm2_control_block && acpi_gbl_FADT.pm2_control_length) {
272 pr->flags.bm_control = 1;
273 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
274 "Bus mastering arbitration control present\n"));
275 } else
276 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
277 "No bus mastering arbitration control\n"));
278
279 if (!strcmp(acpi_device_hid(device), ACPI_PROCESSOR_OBJECT_HID)) {
280 /* Declared with "Processor" statement; match ProcessorID */
281 status = acpi_evaluate_object(pr->handle, NULL, NULL, &buffer);
282 if (ACPI_FAILURE(status)) {
283 printk(KERN_ERR PREFIX "Evaluating processor object\n");
284 return -ENODEV;
285 }
286
287 /*
288 * TBD: Synch processor ID (via LAPIC/LSAPIC structures) on SMP.
289 * >>> 'acpi_get_processor_id(acpi_id, &id)' in
290 * arch/xxx/acpi.c
291 */
292 pr->acpi_id = object.processor.proc_id;
293 } else {
294 /*
295 * Declared with "Device" statement; match _UID.
296 * Note that we don't handle string _UIDs yet.
297 */
298 unsigned long long value;
299 status = acpi_evaluate_integer(pr->handle, METHOD_NAME__UID,
300 NULL, &value);
301 if (ACPI_FAILURE(status)) {
302 printk(KERN_ERR PREFIX
303 "Evaluating processor _UID [%#x]\n", status);
304 return -ENODEV;
305 }
306 device_declaration = 1;
307 pr->acpi_id = value;
308 }
309 cpu_index = acpi_get_cpuid(pr->handle, device_declaration, pr->acpi_id);
310
311 /* Handle UP system running SMP kernel, with no LAPIC in MADT */
312 if (!cpu0_initialized && (cpu_index == -1) &&
313 (num_online_cpus() == 1)) {
314 cpu_index = 0;
315 }
316
317 cpu0_initialized = 1;
318
319 pr->id = cpu_index;
320
321 /*
322 * Extra Processor objects may be enumerated on MP systems with
323 * less than the max # of CPUs. They should be ignored _iff
324 * they are physically not present.
325 */
326 if (pr->id == -1) {
327 if (ACPI_FAILURE
328 (acpi_processor_hotadd_init(pr->handle, &pr->id))) {
329 return -ENODEV;
330 }
331 }
332 /*
333 * On some boxes several processors use the same processor bus id.
334 * But they are located in different scope. For example:
335 * \_SB.SCK0.CPU0
336 * \_SB.SCK1.CPU0
337 * Rename the processor device bus id. And the new bus id will be
338 * generated as the following format:
339 * CPU+CPU ID.
340 */
341 sprintf(acpi_device_bid(device), "CPU%X", pr->id);
342 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Processor [%d:%d]\n", pr->id,
343 pr->acpi_id));
344
345 if (!object.processor.pblk_address)
346 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No PBLK (NULL address)\n"));
347 else if (object.processor.pblk_length != 6)
348 printk(KERN_ERR PREFIX "Invalid PBLK length [%d]\n",
349 object.processor.pblk_length);
350 else {
351 pr->throttling.address = object.processor.pblk_address;
352 pr->throttling.duty_offset = acpi_gbl_FADT.duty_offset;
353 pr->throttling.duty_width = acpi_gbl_FADT.duty_width;
354
355 pr->pblk = object.processor.pblk_address;
356
357 /*
358 * We don't care about error returns - we just try to mark
359 * these reserved so that nobody else is confused into thinking
360 * that this region might be unused..
361 *
362 * (In particular, allocating the IO range for Cardbus)
363 */
364 request_region(pr->throttling.address, 6, "ACPI CPU throttle");
365 }
366
367 /*
368 * If ACPI describes a slot number for this CPU, we can use it
369 * ensure we get the right value in the "physical id" field
370 * of /proc/cpuinfo
371 */
372 status = acpi_evaluate_object(pr->handle, "_SUN", NULL, &buffer);
373 if (ACPI_SUCCESS(status))
374 arch_fix_phys_package_id(pr->id, object.integer.value);
375
376 return 0;
377}
378
379static DEFINE_PER_CPU(void *, processor_device_array);
380
381static void acpi_processor_notify(struct acpi_device *device, u32 event)
382{
383 struct acpi_processor *pr = acpi_driver_data(device);
384 int saved;
385
386 if (!pr)
387 return;
388
389 switch (event) {
390 case ACPI_PROCESSOR_NOTIFY_PERFORMANCE:
391 saved = pr->performance_platform_limit;
392 acpi_processor_ppc_has_changed(pr, 1);
393 if (saved == pr->performance_platform_limit)
394 break;
395 acpi_bus_generate_proc_event(device, event,
396 pr->performance_platform_limit);
397 acpi_bus_generate_netlink_event(device->pnp.device_class,
398 dev_name(&device->dev), event,
399 pr->performance_platform_limit);
400 break;
401 case ACPI_PROCESSOR_NOTIFY_POWER:
402 acpi_processor_cst_has_changed(pr);
403 acpi_bus_generate_proc_event(device, event, 0);
404 acpi_bus_generate_netlink_event(device->pnp.device_class,
405 dev_name(&device->dev), event, 0);
406 break;
407 case ACPI_PROCESSOR_NOTIFY_THROTTLING:
408 acpi_processor_tstate_has_changed(pr);
409 acpi_bus_generate_proc_event(device, event, 0);
410 acpi_bus_generate_netlink_event(device->pnp.device_class,
411 dev_name(&device->dev), event, 0);
412 default:
413 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
414 "Unsupported event [0x%x]\n", event));
415 break;
416 }
417
418 return;
419}
420
421static int acpi_cpu_soft_notify(struct notifier_block *nfb,
422 unsigned long action, void *hcpu)
423{
424 unsigned int cpu = (unsigned long)hcpu;
425 struct acpi_processor *pr = per_cpu(processors, cpu);
426
427 if (action == CPU_ONLINE && pr) {
428 acpi_processor_ppc_has_changed(pr, 0);
429 acpi_processor_cst_has_changed(pr);
430 acpi_processor_reevaluate_tstate(pr, action);
431 acpi_processor_tstate_has_changed(pr);
432 }
433 if (action == CPU_DEAD && pr) {
434 /* invalidate the flag.throttling after one CPU is offline */
435 acpi_processor_reevaluate_tstate(pr, action);
436 }
437 return NOTIFY_OK;
438}
439
440static struct notifier_block acpi_cpu_notifier =
441{
442 .notifier_call = acpi_cpu_soft_notify,
443};
444
445static int __cpuinit acpi_processor_add(struct acpi_device *device)
446{
447 struct acpi_processor *pr = NULL;
448 int result = 0;
449 struct sys_device *sysdev;
450
451 pr = kzalloc(sizeof(struct acpi_processor), GFP_KERNEL);
452 if (!pr)
453 return -ENOMEM;
454
455 if (!zalloc_cpumask_var(&pr->throttling.shared_cpu_map, GFP_KERNEL)) {
456 kfree(pr);
457 return -ENOMEM;
458 }
459
460 pr->handle = device->handle;
461 strcpy(acpi_device_name(device), ACPI_PROCESSOR_DEVICE_NAME);
462 strcpy(acpi_device_class(device), ACPI_PROCESSOR_CLASS);
463 device->driver_data = pr;
464
465 result = acpi_processor_get_info(device);
466 if (result) {
467 /* Processor is physically not present */
468 return 0;
469 }
470
471#ifdef CONFIG_SMP
472 if (pr->id >= setup_max_cpus && pr->id != 0)
473 return 0;
474#endif
475
476 BUG_ON((pr->id >= nr_cpu_ids) || (pr->id < 0));
477
478 /*
479 * Buggy BIOS check
480 * ACPI id of processors can be reported wrongly by the BIOS.
481 * Don't trust it blindly
482 */
483 if (per_cpu(processor_device_array, pr->id) != NULL &&
484 per_cpu(processor_device_array, pr->id) != device) {
485 printk(KERN_WARNING "BIOS reported wrong ACPI id "
486 "for the processor\n");
487 result = -ENODEV;
488 goto err_free_cpumask;
489 }
490 per_cpu(processor_device_array, pr->id) = device;
491
492 per_cpu(processors, pr->id) = pr;
493
494 sysdev = get_cpu_sysdev(pr->id);
495 if (sysfs_create_link(&device->dev.kobj, &sysdev->kobj, "sysdev")) {
496 result = -EFAULT;
497 goto err_free_cpumask;
498 }
499
500#ifdef CONFIG_CPU_FREQ
501 acpi_processor_ppc_has_changed(pr, 0);
502#endif
503 acpi_processor_get_throttling_info(pr);
504 acpi_processor_get_limit_info(pr);
505
506
507 if (cpuidle_get_driver() == &acpi_idle_driver)
508 acpi_processor_power_init(pr, device);
509
510 pr->cdev = thermal_cooling_device_register("Processor", device,
511 &processor_cooling_ops);
512 if (IS_ERR(pr->cdev)) {
513 result = PTR_ERR(pr->cdev);
514 goto err_power_exit;
515 }
516
517 dev_dbg(&device->dev, "registered as cooling_device%d\n",
518 pr->cdev->id);
519
520 result = sysfs_create_link(&device->dev.kobj,
521 &pr->cdev->device.kobj,
522 "thermal_cooling");
523 if (result) {
524 printk(KERN_ERR PREFIX "Create sysfs link\n");
525 goto err_thermal_unregister;
526 }
527 result = sysfs_create_link(&pr->cdev->device.kobj,
528 &device->dev.kobj,
529 "device");
530 if (result) {
531 printk(KERN_ERR PREFIX "Create sysfs link\n");
532 goto err_remove_sysfs;
533 }
534
535 return 0;
536
537err_remove_sysfs:
538 sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
539err_thermal_unregister:
540 thermal_cooling_device_unregister(pr->cdev);
541err_power_exit:
542 acpi_processor_power_exit(pr, device);
543err_free_cpumask:
544 free_cpumask_var(pr->throttling.shared_cpu_map);
545
546 return result;
547}
548
549static int acpi_processor_remove(struct acpi_device *device, int type)
550{
551 struct acpi_processor *pr = NULL;
552
553
554 if (!device || !acpi_driver_data(device))
555 return -EINVAL;
556
557 pr = acpi_driver_data(device);
558
559 if (pr->id >= nr_cpu_ids)
560 goto free;
561
562 if (type == ACPI_BUS_REMOVAL_EJECT) {
563 if (acpi_processor_handle_eject(pr))
564 return -EINVAL;
565 }
566
567 acpi_processor_power_exit(pr, device);
568
569 sysfs_remove_link(&device->dev.kobj, "sysdev");
570
571 if (pr->cdev) {
572 sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
573 sysfs_remove_link(&pr->cdev->device.kobj, "device");
574 thermal_cooling_device_unregister(pr->cdev);
575 pr->cdev = NULL;
576 }
577
578 per_cpu(processors, pr->id) = NULL;
579 per_cpu(processor_device_array, pr->id) = NULL;
580
581free:
582 free_cpumask_var(pr->throttling.shared_cpu_map);
583 kfree(pr);
584
585 return 0;
586}
587
588#ifdef CONFIG_ACPI_HOTPLUG_CPU
589/****************************************************************************
590 * Acpi processor hotplug support *
591 ****************************************************************************/
592
593static int is_processor_present(acpi_handle handle)
594{
595 acpi_status status;
596 unsigned long long sta = 0;
597
598
599 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
600
601 if (ACPI_SUCCESS(status) && (sta & ACPI_STA_DEVICE_PRESENT))
602 return 1;
603
604 /*
605 * _STA is mandatory for a processor that supports hot plug
606 */
607 if (status == AE_NOT_FOUND)
608 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
609 "Processor does not support hot plug\n"));
610 else
611 ACPI_EXCEPTION((AE_INFO, status,
612 "Processor Device is not present"));
613 return 0;
614}
615
616static
617int acpi_processor_device_add(acpi_handle handle, struct acpi_device **device)
618{
619 acpi_handle phandle;
620 struct acpi_device *pdev;
621
622
623 if (acpi_get_parent(handle, &phandle)) {
624 return -ENODEV;
625 }
626
627 if (acpi_bus_get_device(phandle, &pdev)) {
628 return -ENODEV;
629 }
630
631 if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_PROCESSOR)) {
632 return -ENODEV;
633 }
634
635 return 0;
636}
637
638static void acpi_processor_hotplug_notify(acpi_handle handle,
639 u32 event, void *data)
640{
641 struct acpi_processor *pr;
642 struct acpi_device *device = NULL;
643 int result;
644
645
646 switch (event) {
647 case ACPI_NOTIFY_BUS_CHECK:
648 case ACPI_NOTIFY_DEVICE_CHECK:
649 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
650 "Processor driver received %s event\n",
651 (event == ACPI_NOTIFY_BUS_CHECK) ?
652 "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK"));
653
654 if (!is_processor_present(handle))
655 break;
656
657 if (acpi_bus_get_device(handle, &device)) {
658 result = acpi_processor_device_add(handle, &device);
659 if (result)
660 printk(KERN_ERR PREFIX
661 "Unable to add the device\n");
662 break;
663 }
664 break;
665 case ACPI_NOTIFY_EJECT_REQUEST:
666 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
667 "received ACPI_NOTIFY_EJECT_REQUEST\n"));
668
669 if (acpi_bus_get_device(handle, &device)) {
670 printk(KERN_ERR PREFIX
671 "Device don't exist, dropping EJECT\n");
672 break;
673 }
674 pr = acpi_driver_data(device);
675 if (!pr) {
676 printk(KERN_ERR PREFIX
677 "Driver data is NULL, dropping EJECT\n");
678 return;
679 }
680 break;
681 default:
682 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
683 "Unsupported event [0x%x]\n", event));
684 break;
685 }
686
687 return;
688}
689
690static acpi_status
691processor_walk_namespace_cb(acpi_handle handle,
692 u32 lvl, void *context, void **rv)
693{
694 acpi_status status;
695 int *action = context;
696 acpi_object_type type = 0;
697
698 status = acpi_get_type(handle, &type);
699 if (ACPI_FAILURE(status))
700 return (AE_OK);
701
702 if (type != ACPI_TYPE_PROCESSOR)
703 return (AE_OK);
704
705 switch (*action) {
706 case INSTALL_NOTIFY_HANDLER:
707 acpi_install_notify_handler(handle,
708 ACPI_SYSTEM_NOTIFY,
709 acpi_processor_hotplug_notify,
710 NULL);
711 break;
712 case UNINSTALL_NOTIFY_HANDLER:
713 acpi_remove_notify_handler(handle,
714 ACPI_SYSTEM_NOTIFY,
715 acpi_processor_hotplug_notify);
716 break;
717 default:
718 break;
719 }
720
721 return (AE_OK);
722}
723
724static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
725{
726
727 if (!is_processor_present(handle)) {
728 return AE_ERROR;
729 }
730
731 if (acpi_map_lsapic(handle, p_cpu))
732 return AE_ERROR;
733
734 if (arch_register_cpu(*p_cpu)) {
735 acpi_unmap_lsapic(*p_cpu);
736 return AE_ERROR;
737 }
738
739 return AE_OK;
740}
741
742static int acpi_processor_handle_eject(struct acpi_processor *pr)
743{
744 if (cpu_online(pr->id))
745 cpu_down(pr->id);
746
747 arch_unregister_cpu(pr->id);
748 acpi_unmap_lsapic(pr->id);
749 return (0);
750}
751#else
752static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu)
753{
754 return AE_ERROR;
755}
756static int acpi_processor_handle_eject(struct acpi_processor *pr)
757{
758 return (-EINVAL);
759}
760#endif
761
762static
763void acpi_processor_install_hotplug_notify(void)
764{
765#ifdef CONFIG_ACPI_HOTPLUG_CPU
766 int action = INSTALL_NOTIFY_HANDLER;
767 acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
768 ACPI_ROOT_OBJECT,
769 ACPI_UINT32_MAX,
770 processor_walk_namespace_cb, NULL, &action, NULL);
771#endif
772 register_hotcpu_notifier(&acpi_cpu_notifier);
773}
774
775static
776void acpi_processor_uninstall_hotplug_notify(void)
777{
778#ifdef CONFIG_ACPI_HOTPLUG_CPU
779 int action = UNINSTALL_NOTIFY_HANDLER;
780 acpi_walk_namespace(ACPI_TYPE_PROCESSOR,
781 ACPI_ROOT_OBJECT,
782 ACPI_UINT32_MAX,
783 processor_walk_namespace_cb, NULL, &action, NULL);
784#endif
785 unregister_hotcpu_notifier(&acpi_cpu_notifier);
786}
787
788/*
789 * We keep the driver loaded even when ACPI is not running.
790 * This is needed for the powernow-k8 driver, that works even without
791 * ACPI, but needs symbols from this driver
792 */
793
794static int __init acpi_processor_init(void)
795{
796 int result = 0;
797
798 if (acpi_disabled)
799 return 0;
800
801 memset(&errata, 0, sizeof(errata));
802
803 if (!cpuidle_register_driver(&acpi_idle_driver)) {
804 printk(KERN_DEBUG "ACPI: %s registered with cpuidle\n",
805 acpi_idle_driver.name);
806 } else {
807 printk(KERN_DEBUG "ACPI: acpi_idle yielding to %s\n",
808 cpuidle_get_driver()->name);
809 }
810
811 result = acpi_bus_register_driver(&acpi_processor_driver);
812 if (result < 0)
813 goto out_cpuidle;
814
815 acpi_processor_install_hotplug_notify();
816
817 acpi_thermal_cpufreq_init();
818
819 acpi_processor_ppc_init();
820
821 acpi_processor_throttling_init();
822
823 return 0;
824
825out_cpuidle:
826 cpuidle_unregister_driver(&acpi_idle_driver);
827
828 return result;
829}
830
831static void __exit acpi_processor_exit(void)
832{
833 if (acpi_disabled)
834 return;
835
836 acpi_processor_ppc_exit();
837
838 acpi_thermal_cpufreq_exit();
839
840 acpi_processor_uninstall_hotplug_notify();
841
842 acpi_bus_unregister_driver(&acpi_processor_driver);
843
844 cpuidle_unregister_driver(&acpi_idle_driver);
845
846 return;
847}
848
849module_init(acpi_processor_init);
850module_exit(acpi_processor_exit);
851
852MODULE_ALIAS("processor");