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-rw-r--r--drivers/acpi/processor_driver.c812
1 files changed, 78 insertions, 734 deletions
diff --git a/drivers/acpi/processor_driver.c b/drivers/acpi/processor_driver.c
index c266cdc11784..d93963f1e8f4 100644
--- a/drivers/acpi/processor_driver.c
+++ b/drivers/acpi/processor_driver.c
@@ -1,11 +1,13 @@
1/* 1/*
2 * acpi_processor.c - ACPI Processor Driver ($Revision: 71 $) 2 * processor_driver.c - ACPI Processor Driver
3 * 3 *
4 * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com> 4 * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
5 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com> 5 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
6 * Copyright (C) 2004 Dominik Brodowski <linux@brodo.de> 6 * Copyright (C) 2004 Dominik Brodowski <linux@brodo.de>
7 * Copyright (C) 2004 Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com> 7 * Copyright (C) 2004 Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
8 * - Added processor hotplug support 8 * - Added processor hotplug support
9 * Copyright (C) 2013, Intel Corporation
10 * Rafael J. Wysocki <rafael.j.wysocki@intel.com>
9 * 11 *
10 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 12 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
11 * 13 *
@@ -24,52 +26,29 @@
24 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. 26 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
25 * 27 *
26 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 28 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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 */ 29 */
34 30
35#include <linux/kernel.h> 31#include <linux/kernel.h>
36#include <linux/module.h> 32#include <linux/module.h>
37#include <linux/init.h> 33#include <linux/init.h>
38#include <linux/types.h>
39#include <linux/pci.h>
40#include <linux/pm.h>
41#include <linux/cpufreq.h> 34#include <linux/cpufreq.h>
42#include <linux/cpu.h> 35#include <linux/cpu.h>
43#include <linux/dmi.h>
44#include <linux/moduleparam.h>
45#include <linux/cpuidle.h> 36#include <linux/cpuidle.h>
46#include <linux/slab.h> 37#include <linux/slab.h>
47#include <linux/acpi.h> 38#include <linux/acpi.h>
48#include <linux/memory_hotplug.h> 39
49
50#include <asm/io.h>
51#include <asm/cpu.h>
52#include <asm/delay.h>
53#include <asm/uaccess.h>
54#include <asm/processor.h>
55#include <asm/smp.h>
56#include <asm/acpi.h>
57
58#include <acpi/acpi_bus.h>
59#include <acpi/acpi_drivers.h>
60#include <acpi/processor.h> 40#include <acpi/processor.h>
61 41
42#include "internal.h"
43
62#define PREFIX "ACPI: " 44#define PREFIX "ACPI: "
63 45
64#define ACPI_PROCESSOR_CLASS "processor"
65#define ACPI_PROCESSOR_DEVICE_NAME "Processor"
66#define ACPI_PROCESSOR_FILE_INFO "info" 46#define ACPI_PROCESSOR_FILE_INFO "info"
67#define ACPI_PROCESSOR_FILE_THROTTLING "throttling" 47#define ACPI_PROCESSOR_FILE_THROTTLING "throttling"
68#define ACPI_PROCESSOR_FILE_LIMIT "limit" 48#define ACPI_PROCESSOR_FILE_LIMIT "limit"
69#define ACPI_PROCESSOR_NOTIFY_PERFORMANCE 0x80 49#define ACPI_PROCESSOR_NOTIFY_PERFORMANCE 0x80
70#define ACPI_PROCESSOR_NOTIFY_POWER 0x81 50#define ACPI_PROCESSOR_NOTIFY_POWER 0x81
71#define ACPI_PROCESSOR_NOTIFY_THROTTLING 0x82 51#define ACPI_PROCESSOR_NOTIFY_THROTTLING 0x82
72#define ACPI_PROCESSOR_DEVICE_HID "ACPI0007"
73 52
74#define ACPI_PROCESSOR_LIMIT_USER 0 53#define ACPI_PROCESSOR_LIMIT_USER 0
75#define ACPI_PROCESSOR_LIMIT_THERMAL 1 54#define ACPI_PROCESSOR_LIMIT_THERMAL 1
@@ -81,12 +60,8 @@ MODULE_AUTHOR("Paul Diefenbaugh");
81MODULE_DESCRIPTION("ACPI Processor Driver"); 60MODULE_DESCRIPTION("ACPI Processor Driver");
82MODULE_LICENSE("GPL"); 61MODULE_LICENSE("GPL");
83 62
84static int acpi_processor_add(struct acpi_device *device); 63static int acpi_processor_start(struct device *dev);
85static int acpi_processor_remove(struct acpi_device *device); 64static int acpi_processor_stop(struct device *dev);
86static void acpi_processor_notify(struct acpi_device *device, u32 event);
87static acpi_status acpi_processor_hotadd_init(struct acpi_processor *pr);
88static int acpi_processor_handle_eject(struct acpi_processor *pr);
89static int acpi_processor_start(struct acpi_processor *pr);
90 65
91static const struct acpi_device_id processor_device_ids[] = { 66static const struct acpi_device_id processor_device_ids[] = {
92 {ACPI_PROCESSOR_OBJECT_HID, 0}, 67 {ACPI_PROCESSOR_OBJECT_HID, 0},
@@ -95,295 +70,24 @@ static const struct acpi_device_id processor_device_ids[] = {
95}; 70};
96MODULE_DEVICE_TABLE(acpi, processor_device_ids); 71MODULE_DEVICE_TABLE(acpi, processor_device_ids);
97 72
98static struct acpi_driver acpi_processor_driver = { 73static struct device_driver acpi_processor_driver = {
99 .name = "processor", 74 .name = "processor",
100 .class = ACPI_PROCESSOR_CLASS, 75 .bus = &cpu_subsys,
101 .ids = processor_device_ids, 76 .acpi_match_table = processor_device_ids,
102 .ops = { 77 .probe = acpi_processor_start,
103 .add = acpi_processor_add, 78 .remove = acpi_processor_stop,
104 .remove = acpi_processor_remove,
105 .notify = acpi_processor_notify,
106 },
107}; 79};
108 80
109#define INSTALL_NOTIFY_HANDLER 1 81static void acpi_processor_notify(acpi_handle handle, u32 event, void *data)
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{ 82{
123 u8 value1 = 0; 83 struct acpi_device *device = data;
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; 84 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 dev_err(&device->dev,
284 "Failed to evaluate processor object (0x%x)\n",
285 status);
286 return -ENODEV;
287 }
288
289 /*
290 * TBD: Synch processor ID (via LAPIC/LSAPIC structures) on SMP.
291 * >>> 'acpi_get_processor_id(acpi_id, &id)' in
292 * arch/xxx/acpi.c
293 */
294 pr->acpi_id = object.processor.proc_id;
295 } else {
296 /*
297 * Declared with "Device" statement; match _UID.
298 * Note that we don't handle string _UIDs yet.
299 */
300 unsigned long long value;
301 status = acpi_evaluate_integer(pr->handle, METHOD_NAME__UID,
302 NULL, &value);
303 if (ACPI_FAILURE(status)) {
304 dev_err(&device->dev,
305 "Failed to evaluate processor _UID (0x%x)\n",
306 status);
307 return -ENODEV;
308 }
309 device_declaration = 1;
310 pr->acpi_id = value;
311 }
312 cpu_index = acpi_get_cpuid(pr->handle, device_declaration, pr->acpi_id);
313
314 /* Handle UP system running SMP kernel, with no LAPIC in MADT */
315 if (!cpu0_initialized && (cpu_index == -1) &&
316 (num_online_cpus() == 1)) {
317 cpu_index = 0;
318 }
319
320 cpu0_initialized = 1;
321
322 pr->id = cpu_index;
323
324 /*
325 * Extra Processor objects may be enumerated on MP systems with
326 * less than the max # of CPUs. They should be ignored _iff
327 * they are physically not present.
328 */
329 if (pr->id == -1) {
330 if (ACPI_FAILURE(acpi_processor_hotadd_init(pr)))
331 return -ENODEV;
332 }
333 /*
334 * On some boxes several processors use the same processor bus id.
335 * But they are located in different scope. For example:
336 * \_SB.SCK0.CPU0
337 * \_SB.SCK1.CPU0
338 * Rename the processor device bus id. And the new bus id will be
339 * generated as the following format:
340 * CPU+CPU ID.
341 */
342 sprintf(acpi_device_bid(device), "CPU%X", pr->id);
343 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Processor [%d:%d]\n", pr->id,
344 pr->acpi_id));
345
346 if (!object.processor.pblk_address)
347 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No PBLK (NULL address)\n"));
348 else if (object.processor.pblk_length != 6)
349 dev_err(&device->dev, "Invalid PBLK length [%d]\n",
350 object.processor.pblk_length);
351 else {
352 pr->throttling.address = object.processor.pblk_address;
353 pr->throttling.duty_offset = acpi_gbl_FADT.duty_offset;
354 pr->throttling.duty_width = acpi_gbl_FADT.duty_width;
355
356 pr->pblk = object.processor.pblk_address;
357
358 /*
359 * We don't care about error returns - we just try to mark
360 * these reserved so that nobody else is confused into thinking
361 * that this region might be unused..
362 *
363 * (In particular, allocating the IO range for Cardbus)
364 */
365 request_region(pr->throttling.address, 6, "ACPI CPU throttle");
366 }
367
368 /*
369 * If ACPI describes a slot number for this CPU, we can use it
370 * ensure we get the right value in the "physical id" field
371 * of /proc/cpuinfo
372 */
373 status = acpi_evaluate_object(pr->handle, "_SUN", NULL, &buffer);
374 if (ACPI_SUCCESS(status))
375 arch_fix_phys_package_id(pr->id, object.integer.value);
376
377 return 0;
378}
379
380static DEFINE_PER_CPU(void *, processor_device_array);
381
382static void acpi_processor_notify(struct acpi_device *device, u32 event)
383{
384 struct acpi_processor *pr = acpi_driver_data(device);
385 int saved; 85 int saved;
386 86
87 if (device->handle != handle)
88 return;
89
90 pr = acpi_driver_data(device);
387 if (!pr) 91 if (!pr)
388 return; 92 return;
389 93
@@ -420,55 +124,62 @@ static void acpi_processor_notify(struct acpi_device *device, u32 event)
420 return; 124 return;
421} 125}
422 126
423static int acpi_cpu_soft_notify(struct notifier_block *nfb, 127static __cpuinit int __acpi_processor_start(struct acpi_device *device);
424 unsigned long action, void *hcpu) 128
129static int __cpuinit acpi_cpu_soft_notify(struct notifier_block *nfb,
130 unsigned long action, void *hcpu)
425{ 131{
426 unsigned int cpu = (unsigned long)hcpu; 132 unsigned int cpu = (unsigned long)hcpu;
427 struct acpi_processor *pr = per_cpu(processors, cpu); 133 struct acpi_processor *pr = per_cpu(processors, cpu);
134 struct acpi_device *device;
135
136 if (!pr || acpi_bus_get_device(pr->handle, &device))
137 return NOTIFY_DONE;
428 138
429 if (action == CPU_ONLINE && pr) { 139 if (action == CPU_ONLINE) {
430 /* CPU got physically hotplugged and onlined the first time: 140 /*
431 * Initialize missing things 141 * CPU got physically hotplugged and onlined for the first time:
142 * Initialize missing things.
432 */ 143 */
433 if (pr->flags.need_hotplug_init) { 144 if (pr->flags.need_hotplug_init) {
145 int ret;
146
434 pr_info("Will online and init hotplugged CPU: %d\n", 147 pr_info("Will online and init hotplugged CPU: %d\n",
435 pr->id); 148 pr->id);
436 WARN(acpi_processor_start(pr), "Failed to start CPU:"
437 " %d\n", pr->id);
438 pr->flags.need_hotplug_init = 0; 149 pr->flags.need_hotplug_init = 0;
439 /* Normal CPU soft online event */ 150 ret = __acpi_processor_start(device);
151 WARN(ret, "Failed to start CPU: %d\n", pr->id);
440 } else { 152 } else {
153 /* Normal CPU soft online event. */
441 acpi_processor_ppc_has_changed(pr, 0); 154 acpi_processor_ppc_has_changed(pr, 0);
442 acpi_processor_hotplug(pr); 155 acpi_processor_hotplug(pr);
443 acpi_processor_reevaluate_tstate(pr, action); 156 acpi_processor_reevaluate_tstate(pr, action);
444 acpi_processor_tstate_has_changed(pr); 157 acpi_processor_tstate_has_changed(pr);
445 } 158 }
446 } 159 } else if (action == CPU_DEAD) {
447 if (action == CPU_DEAD && pr) { 160 /* Invalidate flag.throttling after the CPU is offline. */
448 /* invalidate the flag.throttling after one CPU is offline */
449 acpi_processor_reevaluate_tstate(pr, action); 161 acpi_processor_reevaluate_tstate(pr, action);
450 } 162 }
451 return NOTIFY_OK; 163 return NOTIFY_OK;
452} 164}
453 165
454static struct notifier_block acpi_cpu_notifier = 166static struct notifier_block __refdata acpi_cpu_notifier =
455{ 167{
456 .notifier_call = acpi_cpu_soft_notify, 168 .notifier_call = acpi_cpu_soft_notify,
457}; 169};
458 170
459/* 171static __cpuinit int __acpi_processor_start(struct acpi_device *device)
460 * acpi_processor_start() is called by the cpu_hotplug_notifier func:
461 * acpi_cpu_soft_notify(). Getting it __cpuinit{data} is difficult, the
462 * root cause seem to be that acpi_processor_uninstall_hotplug_notify()
463 * is in the module_exit (__exit) func. Allowing acpi_processor_start()
464 * to not be in __cpuinit section, but being called from __cpuinit funcs
465 * via __ref looks like the right thing to do here.
466 */
467static __ref int acpi_processor_start(struct acpi_processor *pr)
468{ 172{
469 struct acpi_device *device = per_cpu(processor_device_array, pr->id); 173 struct acpi_processor *pr = acpi_driver_data(device);
174 acpi_status status;
470 int result = 0; 175 int result = 0;
471 176
177 if (!pr)
178 return -ENODEV;
179
180 if (pr->flags.need_hotplug_init)
181 return 0;
182
472#ifdef CONFIG_CPU_FREQ 183#ifdef CONFIG_CPU_FREQ
473 acpi_processor_ppc_has_changed(pr, 0); 184 acpi_processor_ppc_has_changed(pr, 0);
474 acpi_processor_load_module(pr); 185 acpi_processor_load_module(pr);
@@ -506,462 +217,95 @@ static __ref int acpi_processor_start(struct acpi_processor *pr)
506 goto err_remove_sysfs_thermal; 217 goto err_remove_sysfs_thermal;
507 } 218 }
508 219
509 return 0; 220 status = acpi_install_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
221 acpi_processor_notify, device);
222 if (ACPI_SUCCESS(status))
223 return 0;
510 224
511err_remove_sysfs_thermal: 225 sysfs_remove_link(&pr->cdev->device.kobj, "device");
226 err_remove_sysfs_thermal:
512 sysfs_remove_link(&device->dev.kobj, "thermal_cooling"); 227 sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
513err_thermal_unregister: 228 err_thermal_unregister:
514 thermal_cooling_device_unregister(pr->cdev); 229 thermal_cooling_device_unregister(pr->cdev);
515err_power_exit: 230 err_power_exit:
516 acpi_processor_power_exit(pr); 231 acpi_processor_power_exit(pr);
517
518 return result; 232 return result;
519} 233}
520 234
521/* 235static int __cpuinit acpi_processor_start(struct device *dev)
522 * Do not put anything in here which needs the core to be online.
523 * For example MSR access or setting up things which check for cpuinfo_x86
524 * (cpu_data(cpu)) values, like CPU feature flags, family, model, etc.
525 * Such things have to be put in and set up above in acpi_processor_start()
526 */
527static int __cpuinit acpi_processor_add(struct acpi_device *device)
528{ 236{
529 struct acpi_processor *pr = NULL; 237 struct acpi_device *device;
530 int result = 0;
531 struct device *dev;
532
533 pr = kzalloc(sizeof(struct acpi_processor), GFP_KERNEL);
534 if (!pr)
535 return -ENOMEM;
536
537 if (!zalloc_cpumask_var(&pr->throttling.shared_cpu_map, GFP_KERNEL)) {
538 result = -ENOMEM;
539 goto err_free_pr;
540 }
541
542 pr->handle = device->handle;
543 strcpy(acpi_device_name(device), ACPI_PROCESSOR_DEVICE_NAME);
544 strcpy(acpi_device_class(device), ACPI_PROCESSOR_CLASS);
545 device->driver_data = pr;
546
547 result = acpi_processor_get_info(device);
548 if (result) {
549 /* Processor is physically not present */
550 return 0;
551 }
552
553#ifdef CONFIG_SMP
554 if (pr->id >= setup_max_cpus && pr->id != 0)
555 return 0;
556#endif
557
558 BUG_ON(pr->id >= nr_cpu_ids);
559
560 /*
561 * Buggy BIOS check
562 * ACPI id of processors can be reported wrongly by the BIOS.
563 * Don't trust it blindly
564 */
565 if (per_cpu(processor_device_array, pr->id) != NULL &&
566 per_cpu(processor_device_array, pr->id) != device) {
567 dev_warn(&device->dev,
568 "BIOS reported wrong ACPI id %d for the processor\n",
569 pr->id);
570 result = -ENODEV;
571 goto err_free_cpumask;
572 }
573 per_cpu(processor_device_array, pr->id) = device;
574
575 per_cpu(processors, pr->id) = pr;
576
577 dev = get_cpu_device(pr->id);
578 if (sysfs_create_link(&device->dev.kobj, &dev->kobj, "sysdev")) {
579 result = -EFAULT;
580 goto err_clear_processor;
581 }
582 238
583 /* 239 if (acpi_bus_get_device(ACPI_HANDLE(dev), &device))
584 * Do not start hotplugged CPUs now, but when they 240 return -ENODEV;
585 * are onlined the first time
586 */
587 if (pr->flags.need_hotplug_init)
588 return 0;
589
590 result = acpi_processor_start(pr);
591 if (result)
592 goto err_remove_sysfs;
593
594 return 0;
595 241
596err_remove_sysfs: 242 return __acpi_processor_start(device);
597 sysfs_remove_link(&device->dev.kobj, "sysdev");
598err_clear_processor:
599 /*
600 * processor_device_array is not cleared to allow checks for buggy BIOS
601 */
602 per_cpu(processors, pr->id) = NULL;
603err_free_cpumask:
604 free_cpumask_var(pr->throttling.shared_cpu_map);
605err_free_pr:
606 kfree(pr);
607 return result;
608} 243}
609 244
610static int acpi_processor_remove(struct acpi_device *device) 245static int acpi_processor_stop(struct device *dev)
611{ 246{
612 struct acpi_processor *pr = NULL; 247 struct acpi_device *device;
248 struct acpi_processor *pr;
613 249
250 if (acpi_bus_get_device(ACPI_HANDLE(dev), &device))
251 return 0;
614 252
615 if (!device || !acpi_driver_data(device)) 253 acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
616 return -EINVAL; 254 acpi_processor_notify);
617 255
618 pr = acpi_driver_data(device); 256 pr = acpi_driver_data(device);
619 257 if (!pr)
620 if (pr->id >= nr_cpu_ids) 258 return 0;
621 goto free;
622
623 if (device->removal_type == ACPI_BUS_REMOVAL_EJECT) {
624 if (acpi_processor_handle_eject(pr))
625 return -EINVAL;
626 }
627 259
628 acpi_processor_power_exit(pr); 260 acpi_processor_power_exit(pr);
629 261
630 sysfs_remove_link(&device->dev.kobj, "sysdev");
631
632 if (pr->cdev) { 262 if (pr->cdev) {
633 sysfs_remove_link(&device->dev.kobj, "thermal_cooling"); 263 sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
634 sysfs_remove_link(&pr->cdev->device.kobj, "device"); 264 sysfs_remove_link(&pr->cdev->device.kobj, "device");
635 thermal_cooling_device_unregister(pr->cdev); 265 thermal_cooling_device_unregister(pr->cdev);
636 pr->cdev = NULL; 266 pr->cdev = NULL;
637 } 267 }
638
639 per_cpu(processors, pr->id) = NULL;
640 per_cpu(processor_device_array, pr->id) = NULL;
641 try_offline_node(cpu_to_node(pr->id));
642
643free:
644 free_cpumask_var(pr->throttling.shared_cpu_map);
645 kfree(pr);
646
647 return 0; 268 return 0;
648} 269}
649 270
650#ifdef CONFIG_ACPI_HOTPLUG_CPU
651/****************************************************************************
652 * Acpi processor hotplug support *
653 ****************************************************************************/
654
655static int is_processor_present(acpi_handle handle)
656{
657 acpi_status status;
658 unsigned long long sta = 0;
659
660
661 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
662
663 if (ACPI_SUCCESS(status) && (sta & ACPI_STA_DEVICE_PRESENT))
664 return 1;
665
666 /*
667 * _STA is mandatory for a processor that supports hot plug
668 */
669 if (status == AE_NOT_FOUND)
670 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
671 "Processor does not support hot plug\n"));
672 else
673 ACPI_EXCEPTION((AE_INFO, status,
674 "Processor Device is not present"));
675 return 0;
676}
677
678static void acpi_processor_hotplug_notify(acpi_handle handle,
679 u32 event, void *data)
680{
681 struct acpi_device *device = NULL;
682 struct acpi_eject_event *ej_event = NULL;
683 u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE; /* default */
684 acpi_status status;
685 int result;
686
687 acpi_scan_lock_acquire();
688
689 switch (event) {
690 case ACPI_NOTIFY_BUS_CHECK:
691 case ACPI_NOTIFY_DEVICE_CHECK:
692 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
693 "Processor driver received %s event\n",
694 (event == ACPI_NOTIFY_BUS_CHECK) ?
695 "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK"));
696
697 if (!is_processor_present(handle))
698 break;
699
700 if (!acpi_bus_get_device(handle, &device))
701 break;
702
703 result = acpi_bus_scan(handle);
704 if (result) {
705 acpi_handle_err(handle, "Unable to add the device\n");
706 break;
707 }
708 result = acpi_bus_get_device(handle, &device);
709 if (result) {
710 acpi_handle_err(handle, "Missing device object\n");
711 break;
712 }
713 ost_code = ACPI_OST_SC_SUCCESS;
714 break;
715
716 case ACPI_NOTIFY_EJECT_REQUEST:
717 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
718 "received ACPI_NOTIFY_EJECT_REQUEST\n"));
719
720 if (acpi_bus_get_device(handle, &device)) {
721 acpi_handle_err(handle,
722 "Device don't exist, dropping EJECT\n");
723 break;
724 }
725 if (!acpi_driver_data(device)) {
726 acpi_handle_err(handle,
727 "Driver data is NULL, dropping EJECT\n");
728 break;
729 }
730
731 ej_event = kmalloc(sizeof(*ej_event), GFP_KERNEL);
732 if (!ej_event) {
733 acpi_handle_err(handle, "No memory, dropping EJECT\n");
734 break;
735 }
736
737 get_device(&device->dev);
738 ej_event->device = device;
739 ej_event->event = ACPI_NOTIFY_EJECT_REQUEST;
740 /* The eject is carried out asynchronously. */
741 status = acpi_os_hotplug_execute(acpi_bus_hot_remove_device,
742 ej_event);
743 if (ACPI_FAILURE(status)) {
744 put_device(&device->dev);
745 kfree(ej_event);
746 break;
747 }
748 goto out;
749
750 default:
751 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
752 "Unsupported event [0x%x]\n", event));
753
754 /* non-hotplug event; possibly handled by other handler */
755 goto out;
756 }
757
758 /* Inform firmware that the hotplug operation has completed */
759 (void) acpi_evaluate_hotplug_ost(handle, event, ost_code, NULL);
760
761 out:
762 acpi_scan_lock_release();
763}
764
765static acpi_status is_processor_device(acpi_handle handle)
766{
767 struct acpi_device_info *info;
768 char *hid;
769 acpi_status status;
770
771 status = acpi_get_object_info(handle, &info);
772 if (ACPI_FAILURE(status))
773 return status;
774
775 if (info->type == ACPI_TYPE_PROCESSOR) {
776 kfree(info);
777 return AE_OK; /* found a processor object */
778 }
779
780 if (!(info->valid & ACPI_VALID_HID)) {
781 kfree(info);
782 return AE_ERROR;
783 }
784
785 hid = info->hardware_id.string;
786 if ((hid == NULL) || strcmp(hid, ACPI_PROCESSOR_DEVICE_HID)) {
787 kfree(info);
788 return AE_ERROR;
789 }
790
791 kfree(info);
792 return AE_OK; /* found a processor device object */
793}
794
795static acpi_status
796processor_walk_namespace_cb(acpi_handle handle,
797 u32 lvl, void *context, void **rv)
798{
799 acpi_status status;
800 int *action = context;
801
802 status = is_processor_device(handle);
803 if (ACPI_FAILURE(status))
804 return AE_OK; /* not a processor; continue to walk */
805
806 switch (*action) {
807 case INSTALL_NOTIFY_HANDLER:
808 acpi_install_notify_handler(handle,
809 ACPI_SYSTEM_NOTIFY,
810 acpi_processor_hotplug_notify,
811 NULL);
812 break;
813 case UNINSTALL_NOTIFY_HANDLER:
814 acpi_remove_notify_handler(handle,
815 ACPI_SYSTEM_NOTIFY,
816 acpi_processor_hotplug_notify);
817 break;
818 default:
819 break;
820 }
821
822 /* found a processor; skip walking underneath */
823 return AE_CTRL_DEPTH;
824}
825
826static acpi_status acpi_processor_hotadd_init(struct acpi_processor *pr)
827{
828 acpi_handle handle = pr->handle;
829
830 if (!is_processor_present(handle)) {
831 return AE_ERROR;
832 }
833
834 if (acpi_map_lsapic(handle, &pr->id))
835 return AE_ERROR;
836
837 if (arch_register_cpu(pr->id)) {
838 acpi_unmap_lsapic(pr->id);
839 return AE_ERROR;
840 }
841
842 /* CPU got hot-plugged, but cpu_data is not initialized yet
843 * Set flag to delay cpu_idle/throttling initialization
844 * in:
845 * acpi_processor_add()
846 * acpi_processor_get_info()
847 * and do it when the CPU gets online the first time
848 * TBD: Cleanup above functions and try to do this more elegant.
849 */
850 pr_info("CPU %d got hotplugged\n", pr->id);
851 pr->flags.need_hotplug_init = 1;
852
853 return AE_OK;
854}
855
856static int acpi_processor_handle_eject(struct acpi_processor *pr)
857{
858 if (cpu_online(pr->id))
859 cpu_down(pr->id);
860
861 get_online_cpus();
862 /*
863 * The cpu might become online again at this point. So we check whether
864 * the cpu has been onlined or not. If the cpu became online, it means
865 * that someone wants to use the cpu. So acpi_processor_handle_eject()
866 * returns -EAGAIN.
867 */
868 if (unlikely(cpu_online(pr->id))) {
869 put_online_cpus();
870 pr_warn("Failed to remove CPU %d, because other task "
871 "brought the CPU back online\n", pr->id);
872 return -EAGAIN;
873 }
874 arch_unregister_cpu(pr->id);
875 acpi_unmap_lsapic(pr->id);
876 put_online_cpus();
877 return (0);
878}
879#else
880static acpi_status acpi_processor_hotadd_init(struct acpi_processor *pr)
881{
882 return AE_ERROR;
883}
884static int acpi_processor_handle_eject(struct acpi_processor *pr)
885{
886 return (-EINVAL);
887}
888#endif
889
890static
891void acpi_processor_install_hotplug_notify(void)
892{
893#ifdef CONFIG_ACPI_HOTPLUG_CPU
894 int action = INSTALL_NOTIFY_HANDLER;
895 acpi_walk_namespace(ACPI_TYPE_ANY,
896 ACPI_ROOT_OBJECT,
897 ACPI_UINT32_MAX,
898 processor_walk_namespace_cb, NULL, &action, NULL);
899#endif
900 register_hotcpu_notifier(&acpi_cpu_notifier);
901}
902
903static
904void acpi_processor_uninstall_hotplug_notify(void)
905{
906#ifdef CONFIG_ACPI_HOTPLUG_CPU
907 int action = UNINSTALL_NOTIFY_HANDLER;
908 acpi_walk_namespace(ACPI_TYPE_ANY,
909 ACPI_ROOT_OBJECT,
910 ACPI_UINT32_MAX,
911 processor_walk_namespace_cb, NULL, &action, NULL);
912#endif
913 unregister_hotcpu_notifier(&acpi_cpu_notifier);
914}
915
916/* 271/*
917 * We keep the driver loaded even when ACPI is not running. 272 * We keep the driver loaded even when ACPI is not running.
918 * This is needed for the powernow-k8 driver, that works even without 273 * This is needed for the powernow-k8 driver, that works even without
919 * ACPI, but needs symbols from this driver 274 * ACPI, but needs symbols from this driver
920 */ 275 */
921 276
922static int __init acpi_processor_init(void) 277static int __init acpi_processor_driver_init(void)
923{ 278{
924 int result = 0; 279 int result = 0;
925 280
926 if (acpi_disabled) 281 if (acpi_disabled)
927 return 0; 282 return 0;
928 283
929 result = acpi_bus_register_driver(&acpi_processor_driver); 284 result = driver_register(&acpi_processor_driver);
930 if (result < 0) 285 if (result < 0)
931 return result; 286 return result;
932 287
933 acpi_processor_syscore_init(); 288 acpi_processor_syscore_init();
934 289 register_hotcpu_notifier(&acpi_cpu_notifier);
935 acpi_processor_install_hotplug_notify();
936
937 acpi_thermal_cpufreq_init(); 290 acpi_thermal_cpufreq_init();
938
939 acpi_processor_ppc_init(); 291 acpi_processor_ppc_init();
940
941 acpi_processor_throttling_init(); 292 acpi_processor_throttling_init();
942
943 return 0; 293 return 0;
944} 294}
945 295
946static void __exit acpi_processor_exit(void) 296static void __exit acpi_processor_driver_exit(void)
947{ 297{
948 if (acpi_disabled) 298 if (acpi_disabled)
949 return; 299 return;
950 300
951 acpi_processor_ppc_exit(); 301 acpi_processor_ppc_exit();
952
953 acpi_thermal_cpufreq_exit(); 302 acpi_thermal_cpufreq_exit();
954 303 unregister_hotcpu_notifier(&acpi_cpu_notifier);
955 acpi_processor_uninstall_hotplug_notify();
956
957 acpi_processor_syscore_exit(); 304 acpi_processor_syscore_exit();
958 305 driver_unregister(&acpi_processor_driver);
959 acpi_bus_unregister_driver(&acpi_processor_driver);
960
961 return;
962} 306}
963 307
964module_init(acpi_processor_init); 308module_init(acpi_processor_driver_init);
965module_exit(acpi_processor_exit); 309module_exit(acpi_processor_driver_exit);
966 310
967MODULE_ALIAS("processor"); 311MODULE_ALIAS("processor");
generated by cgit v1.2.2 (git 2.25.0) at 2025-09-11 23:24:15 -0400