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Linux/drivers/acpi/acpi_processor.c

  1 /*
  2  * acpi_processor.c - ACPI processor enumeration support
  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  * Copyright (C) 2013, Intel Corporation
  9  *                     Rafael J. Wysocki <rafael.j.wysocki@intel.com>
 10  *
 11  * This program is free software; you can redistribute it and/or modify it
 12  * under the terms of the GNU General Public License version 2 as published
 13  * by the Free Software Foundation.
 14  */
 15 
 16 #include <linux/acpi.h>
 17 #include <linux/device.h>
 18 #include <linux/kernel.h>
 19 #include <linux/module.h>
 20 #include <linux/pci.h>
 21 
 22 #include <acpi/processor.h>
 23 
 24 #include <asm/cpu.h>
 25 
 26 #include "internal.h"
 27 
 28 #define _COMPONENT      ACPI_PROCESSOR_COMPONENT
 29 
 30 ACPI_MODULE_NAME("processor");
 31 
 32 DEFINE_PER_CPU(struct acpi_processor *, processors);
 33 EXPORT_PER_CPU_SYMBOL(processors);
 34 
 35 /* --------------------------------------------------------------------------
 36                                 Errata Handling
 37    -------------------------------------------------------------------------- */
 38 
 39 struct acpi_processor_errata errata __read_mostly;
 40 EXPORT_SYMBOL_GPL(errata);
 41 
 42 static int acpi_processor_errata_piix4(struct pci_dev *dev)
 43 {
 44         u8 value1 = 0;
 45         u8 value2 = 0;
 46 
 47 
 48         if (!dev)
 49                 return -EINVAL;
 50 
 51         /*
 52          * Note that 'dev' references the PIIX4 ACPI Controller.
 53          */
 54 
 55         switch (dev->revision) {
 56         case 0:
 57                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 A-step\n"));
 58                 break;
 59         case 1:
 60                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4 B-step\n"));
 61                 break;
 62         case 2:
 63                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4E\n"));
 64                 break;
 65         case 3:
 66                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found PIIX4M\n"));
 67                 break;
 68         default:
 69                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found unknown PIIX4\n"));
 70                 break;
 71         }
 72 
 73         switch (dev->revision) {
 74 
 75         case 0:         /* PIIX4 A-step */
 76         case 1:         /* PIIX4 B-step */
 77                 /*
 78                  * See specification changes #13 ("Manual Throttle Duty Cycle")
 79                  * and #14 ("Enabling and Disabling Manual Throttle"), plus
 80                  * erratum #5 ("STPCLK# Deassertion Time") from the January
 81                  * 2002 PIIX4 specification update.  Applies to only older
 82                  * PIIX4 models.
 83                  */
 84                 errata.piix4.throttle = 1;
 85 
 86         case 2:         /* PIIX4E */
 87         case 3:         /* PIIX4M */
 88                 /*
 89                  * See erratum #18 ("C3 Power State/BMIDE and Type-F DMA
 90                  * Livelock") from the January 2002 PIIX4 specification update.
 91                  * Applies to all PIIX4 models.
 92                  */
 93 
 94                 /*
 95                  * BM-IDE
 96                  * ------
 97                  * Find the PIIX4 IDE Controller and get the Bus Master IDE
 98                  * Status register address.  We'll use this later to read
 99                  * each IDE controller's DMA status to make sure we catch all
100                  * DMA activity.
101                  */
102                 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
103                                      PCI_DEVICE_ID_INTEL_82371AB,
104                                      PCI_ANY_ID, PCI_ANY_ID, NULL);
105                 if (dev) {
106                         errata.piix4.bmisx = pci_resource_start(dev, 4);
107                         pci_dev_put(dev);
108                 }
109 
110                 /*
111                  * Type-F DMA
112                  * ----------
113                  * Find the PIIX4 ISA Controller and read the Motherboard
114                  * DMA controller's status to see if Type-F (Fast) DMA mode
115                  * is enabled (bit 7) on either channel.  Note that we'll
116                  * disable C3 support if this is enabled, as some legacy
117                  * devices won't operate well if fast DMA is disabled.
118                  */
119                 dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
120                                      PCI_DEVICE_ID_INTEL_82371AB_0,
121                                      PCI_ANY_ID, PCI_ANY_ID, NULL);
122                 if (dev) {
123                         pci_read_config_byte(dev, 0x76, &value1);
124                         pci_read_config_byte(dev, 0x77, &value2);
125                         if ((value1 & 0x80) || (value2 & 0x80))
126                                 errata.piix4.fdma = 1;
127                         pci_dev_put(dev);
128                 }
129 
130                 break;
131         }
132 
133         if (errata.piix4.bmisx)
134                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
135                                   "Bus master activity detection (BM-IDE) erratum enabled\n"));
136         if (errata.piix4.fdma)
137                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
138                                   "Type-F DMA livelock erratum (C3 disabled)\n"));
139 
140         return 0;
141 }
142 
143 static int acpi_processor_errata(void)
144 {
145         int result = 0;
146         struct pci_dev *dev = NULL;
147 
148         /*
149          * PIIX4
150          */
151         dev = pci_get_subsys(PCI_VENDOR_ID_INTEL,
152                              PCI_DEVICE_ID_INTEL_82371AB_3, PCI_ANY_ID,
153                              PCI_ANY_ID, NULL);
154         if (dev) {
155                 result = acpi_processor_errata_piix4(dev);
156                 pci_dev_put(dev);
157         }
158 
159         return result;
160 }
161 
162 /* --------------------------------------------------------------------------
163                                 Initialization
164    -------------------------------------------------------------------------- */
165 
166 #ifdef CONFIG_ACPI_HOTPLUG_CPU
167 int __weak acpi_map_cpu(acpi_handle handle,
168                 phys_cpuid_t physid, int *pcpu)
169 {
170         return -ENODEV;
171 }
172 
173 int __weak acpi_unmap_cpu(int cpu)
174 {
175         return -ENODEV;
176 }
177 
178 int __weak arch_register_cpu(int cpu)
179 {
180         return -ENODEV;
181 }
182 
183 void __weak arch_unregister_cpu(int cpu) {}
184 
185 int __weak acpi_map_cpu2node(acpi_handle handle, int cpu, int physid)
186 {
187         return -ENODEV;
188 }
189 
190 static int acpi_processor_hotadd_init(struct acpi_processor *pr)
191 {
192         unsigned long long sta;
193         acpi_status status;
194         int ret;
195 
196         if (invalid_phys_cpuid(pr->phys_id))
197                 return -ENODEV;
198 
199         status = acpi_evaluate_integer(pr->handle, "_STA", NULL, &sta);
200         if (ACPI_FAILURE(status) || !(sta & ACPI_STA_DEVICE_PRESENT))
201                 return -ENODEV;
202 
203         cpu_maps_update_begin();
204         cpu_hotplug_begin();
205 
206         ret = acpi_map_cpu(pr->handle, pr->phys_id, &pr->id);
207         if (ret)
208                 goto out;
209 
210         ret = arch_register_cpu(pr->id);
211         if (ret) {
212                 acpi_unmap_cpu(pr->id);
213                 goto out;
214         }
215 
216         /*
217          * CPU got hot-added, but cpu_data is not initialized yet.  Set a flag
218          * to delay cpu_idle/throttling initialization and do it when the CPU
219          * gets online for the first time.
220          */
221         pr_info("CPU%d has been hot-added\n", pr->id);
222         pr->flags.need_hotplug_init = 1;
223 
224 out:
225         cpu_hotplug_done();
226         cpu_maps_update_done();
227         return ret;
228 }
229 #else
230 static inline int acpi_processor_hotadd_init(struct acpi_processor *pr)
231 {
232         return -ENODEV;
233 }
234 #endif /* CONFIG_ACPI_HOTPLUG_CPU */
235 
236 static int acpi_processor_get_info(struct acpi_device *device)
237 {
238         union acpi_object object = { 0 };
239         struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
240         struct acpi_processor *pr = acpi_driver_data(device);
241         int device_declaration = 0;
242         acpi_status status = AE_OK;
243         static int cpu0_initialized;
244         unsigned long long value;
245 
246         acpi_processor_errata();
247 
248         /*
249          * Check to see if we have bus mastering arbitration control.  This
250          * is required for proper C3 usage (to maintain cache coherency).
251          */
252         if (acpi_gbl_FADT.pm2_control_block && acpi_gbl_FADT.pm2_control_length) {
253                 pr->flags.bm_control = 1;
254                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
255                                   "Bus mastering arbitration control present\n"));
256         } else
257                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
258                                   "No bus mastering arbitration control\n"));
259 
260         if (!strcmp(acpi_device_hid(device), ACPI_PROCESSOR_OBJECT_HID)) {
261                 /* Declared with "Processor" statement; match ProcessorID */
262                 status = acpi_evaluate_object(pr->handle, NULL, NULL, &buffer);
263                 if (ACPI_FAILURE(status)) {
264                         dev_err(&device->dev,
265                                 "Failed to evaluate processor object (0x%x)\n",
266                                 status);
267                         return -ENODEV;
268                 }
269 
270                 pr->acpi_id = object.processor.proc_id;
271         } else {
272                 /*
273                  * Declared with "Device" statement; match _UID.
274                  * Note that we don't handle string _UIDs yet.
275                  */
276                 status = acpi_evaluate_integer(pr->handle, METHOD_NAME__UID,
277                                                 NULL, &value);
278                 if (ACPI_FAILURE(status)) {
279                         dev_err(&device->dev,
280                                 "Failed to evaluate processor _UID (0x%x)\n",
281                                 status);
282                         return -ENODEV;
283                 }
284                 device_declaration = 1;
285                 pr->acpi_id = value;
286         }
287 
288         pr->phys_id = acpi_get_phys_id(pr->handle, device_declaration,
289                                         pr->acpi_id);
290         if (invalid_phys_cpuid(pr->phys_id))
291                 acpi_handle_debug(pr->handle, "failed to get CPU physical ID.\n");
292 
293         pr->id = acpi_map_cpuid(pr->phys_id, pr->acpi_id);
294         if (!cpu0_initialized && !acpi_has_cpu_in_madt()) {
295                 cpu0_initialized = 1;
296                 /*
297                  * Handle UP system running SMP kernel, with no CPU
298                  * entry in MADT
299                  */
300                 if (invalid_logical_cpuid(pr->id) && (num_online_cpus() == 1))
301                         pr->id = 0;
302         }
303 
304         /*
305          *  Extra Processor objects may be enumerated on MP systems with
306          *  less than the max # of CPUs. They should be ignored _iff
307          *  they are physically not present.
308          *
309          *  NOTE: Even if the processor has a cpuid, it may not be present
310          *  because cpuid <-> apicid mapping is persistent now.
311          */
312         if (invalid_logical_cpuid(pr->id) || !cpu_present(pr->id)) {
313                 int ret = acpi_processor_hotadd_init(pr);
314                 if (ret)
315                         return ret;
316         }
317 
318         /*
319          * On some boxes several processors use the same processor bus id.
320          * But they are located in different scope. For example:
321          * \_SB.SCK0.CPU0
322          * \_SB.SCK1.CPU0
323          * Rename the processor device bus id. And the new bus id will be
324          * generated as the following format:
325          * CPU+CPU ID.
326          */
327         sprintf(acpi_device_bid(device), "CPU%X", pr->id);
328         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Processor [%d:%d]\n", pr->id,
329                           pr->acpi_id));
330 
331         if (!object.processor.pblk_address)
332                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No PBLK (NULL address)\n"));
333         else if (object.processor.pblk_length != 6)
334                 dev_err(&device->dev, "Invalid PBLK length [%d]\n",
335                             object.processor.pblk_length);
336         else {
337                 pr->throttling.address = object.processor.pblk_address;
338                 pr->throttling.duty_offset = acpi_gbl_FADT.duty_offset;
339                 pr->throttling.duty_width = acpi_gbl_FADT.duty_width;
340 
341                 pr->pblk = object.processor.pblk_address;
342         }
343 
344         /*
345          * If ACPI describes a slot number for this CPU, we can use it to
346          * ensure we get the right value in the "physical id" field
347          * of /proc/cpuinfo
348          */
349         status = acpi_evaluate_integer(pr->handle, "_SUN", NULL, &value);
350         if (ACPI_SUCCESS(status))
351                 arch_fix_phys_package_id(pr->id, value);
352 
353         return 0;
354 }
355 
356 /*
357  * Do not put anything in here which needs the core to be online.
358  * For example MSR access or setting up things which check for cpuinfo_x86
359  * (cpu_data(cpu)) values, like CPU feature flags, family, model, etc.
360  * Such things have to be put in and set up by the processor driver's .probe().
361  */
362 static DEFINE_PER_CPU(void *, processor_device_array);
363 
364 static int acpi_processor_add(struct acpi_device *device,
365                                         const struct acpi_device_id *id)
366 {
367         struct acpi_processor *pr;
368         struct device *dev;
369         int result = 0;
370 
371         pr = kzalloc(sizeof(struct acpi_processor), GFP_KERNEL);
372         if (!pr)
373                 return -ENOMEM;
374 
375         if (!zalloc_cpumask_var(&pr->throttling.shared_cpu_map, GFP_KERNEL)) {
376                 result = -ENOMEM;
377                 goto err_free_pr;
378         }
379 
380         pr->handle = device->handle;
381         strcpy(acpi_device_name(device), ACPI_PROCESSOR_DEVICE_NAME);
382         strcpy(acpi_device_class(device), ACPI_PROCESSOR_CLASS);
383         device->driver_data = pr;
384 
385         result = acpi_processor_get_info(device);
386         if (result) /* Processor is not physically present or unavailable */
387                 return 0;
388 
389 #ifdef CONFIG_SMP
390         if (pr->id >= setup_max_cpus && pr->id != 0)
391                 return 0;
392 #endif
393 
394         BUG_ON(pr->id >= nr_cpu_ids);
395 
396         /*
397          * Buggy BIOS check.
398          * ACPI id of processors can be reported wrongly by the BIOS.
399          * Don't trust it blindly
400          */
401         if (per_cpu(processor_device_array, pr->id) != NULL &&
402             per_cpu(processor_device_array, pr->id) != device) {
403                 dev_warn(&device->dev,
404                         "BIOS reported wrong ACPI id %d for the processor\n",
405                         pr->id);
406                 /* Give up, but do not abort the namespace scan. */
407                 goto err;
408         }
409         /*
410          * processor_device_array is not cleared on errors to allow buggy BIOS
411          * checks.
412          */
413         per_cpu(processor_device_array, pr->id) = device;
414         per_cpu(processors, pr->id) = pr;
415 
416         dev = get_cpu_device(pr->id);
417         if (!dev) {
418                 result = -ENODEV;
419                 goto err;
420         }
421 
422         result = acpi_bind_one(dev, device);
423         if (result)
424                 goto err;
425 
426         pr->dev = dev;
427 
428         /* Trigger the processor driver's .probe() if present. */
429         if (device_attach(dev) >= 0)
430                 return 1;
431 
432         dev_err(dev, "Processor driver could not be attached\n");
433         acpi_unbind_one(dev);
434 
435  err:
436         free_cpumask_var(pr->throttling.shared_cpu_map);
437         device->driver_data = NULL;
438         per_cpu(processors, pr->id) = NULL;
439  err_free_pr:
440         kfree(pr);
441         return result;
442 }
443 
444 #ifdef CONFIG_ACPI_HOTPLUG_CPU
445 /* --------------------------------------------------------------------------
446                                     Removal
447    -------------------------------------------------------------------------- */
448 
449 static void acpi_processor_remove(struct acpi_device *device)
450 {
451         struct acpi_processor *pr;
452 
453         if (!device || !acpi_driver_data(device))
454                 return;
455 
456         pr = acpi_driver_data(device);
457         if (pr->id >= nr_cpu_ids)
458                 goto out;
459 
460         /*
461          * The only reason why we ever get here is CPU hot-removal.  The CPU is
462          * already offline and the ACPI device removal locking prevents it from
463          * being put back online at this point.
464          *
465          * Unbind the driver from the processor device and detach it from the
466          * ACPI companion object.
467          */
468         device_release_driver(pr->dev);
469         acpi_unbind_one(pr->dev);
470 
471         /* Clean up. */
472         per_cpu(processor_device_array, pr->id) = NULL;
473         per_cpu(processors, pr->id) = NULL;
474 
475         cpu_maps_update_begin();
476         cpu_hotplug_begin();
477 
478         /* Remove the CPU. */
479         arch_unregister_cpu(pr->id);
480         acpi_unmap_cpu(pr->id);
481 
482         cpu_hotplug_done();
483         cpu_maps_update_done();
484 
485         try_offline_node(cpu_to_node(pr->id));
486 
487  out:
488         free_cpumask_var(pr->throttling.shared_cpu_map);
489         kfree(pr);
490 }
491 #endif /* CONFIG_ACPI_HOTPLUG_CPU */
492 
493 #ifdef CONFIG_X86
494 static bool acpi_hwp_native_thermal_lvt_set;
495 static acpi_status __init acpi_hwp_native_thermal_lvt_osc(acpi_handle handle,
496                                                           u32 lvl,
497                                                           void *context,
498                                                           void **rv)
499 {
500         u8 sb_uuid_str[] = "4077A616-290C-47BE-9EBD-D87058713953";
501         u32 capbuf[2];
502         struct acpi_osc_context osc_context = {
503                 .uuid_str = sb_uuid_str,
504                 .rev = 1,
505                 .cap.length = 8,
506                 .cap.pointer = capbuf,
507         };
508 
509         if (acpi_hwp_native_thermal_lvt_set)
510                 return AE_CTRL_TERMINATE;
511 
512         capbuf[0] = 0x0000;
513         capbuf[1] = 0x1000; /* set bit 12 */
514 
515         if (ACPI_SUCCESS(acpi_run_osc(handle, &osc_context))) {
516                 if (osc_context.ret.pointer && osc_context.ret.length > 1) {
517                         u32 *capbuf_ret = osc_context.ret.pointer;
518 
519                         if (capbuf_ret[1] & 0x1000) {
520                                 acpi_handle_info(handle,
521                                         "_OSC native thermal LVT Acked\n");
522                                 acpi_hwp_native_thermal_lvt_set = true;
523                         }
524                 }
525                 kfree(osc_context.ret.pointer);
526         }
527 
528         return AE_OK;
529 }
530 
531 void __init acpi_early_processor_osc(void)
532 {
533         if (boot_cpu_has(X86_FEATURE_HWP)) {
534                 acpi_walk_namespace(ACPI_TYPE_PROCESSOR, ACPI_ROOT_OBJECT,
535                                     ACPI_UINT32_MAX,
536                                     acpi_hwp_native_thermal_lvt_osc,
537                                     NULL, NULL, NULL);
538                 acpi_get_devices(ACPI_PROCESSOR_DEVICE_HID,
539                                  acpi_hwp_native_thermal_lvt_osc,
540                                  NULL, NULL);
541         }
542 }
543 #endif
544 
545 /*
546  * The following ACPI IDs are known to be suitable for representing as
547  * processor devices.
548  */
549 static const struct acpi_device_id processor_device_ids[] = {
550 
551         { ACPI_PROCESSOR_OBJECT_HID, },
552         { ACPI_PROCESSOR_DEVICE_HID, },
553 
554         { }
555 };
556 
557 static struct acpi_scan_handler processor_handler = {
558         .ids = processor_device_ids,
559         .attach = acpi_processor_add,
560 #ifdef CONFIG_ACPI_HOTPLUG_CPU
561         .detach = acpi_processor_remove,
562 #endif
563         .hotplug = {
564                 .enabled = true,
565         },
566 };
567 
568 static int acpi_processor_container_attach(struct acpi_device *dev,
569                                            const struct acpi_device_id *id)
570 {
571         return 1;
572 }
573 
574 static const struct acpi_device_id processor_container_ids[] = {
575         { ACPI_PROCESSOR_CONTAINER_HID, },
576         { }
577 };
578 
579 static struct acpi_scan_handler processor_container_handler = {
580         .ids = processor_container_ids,
581         .attach = acpi_processor_container_attach,
582 };
583 
584 /* The number of the unique processor IDs */
585 static int nr_unique_ids __initdata;
586 
587 /* The number of the duplicate processor IDs */
588 static int nr_duplicate_ids __initdata;
589 
590 /* Used to store the unique processor IDs */
591 static int unique_processor_ids[] __initdata = {
592         [0 ... NR_CPUS - 1] = -1,
593 };
594 
595 /* Used to store the duplicate processor IDs */
596 static int duplicate_processor_ids[] __initdata = {
597         [0 ... NR_CPUS - 1] = -1,
598 };
599 
600 static void __init processor_validated_ids_update(int proc_id)
601 {
602         int i;
603 
604         if (nr_unique_ids == NR_CPUS||nr_duplicate_ids == NR_CPUS)
605                 return;
606 
607         /*
608          * Firstly, compare the proc_id with duplicate IDs, if the proc_id is
609          * already in the IDs, do nothing.
610          */
611         for (i = 0; i < nr_duplicate_ids; i++) {
612                 if (duplicate_processor_ids[i] == proc_id)
613                         return;
614         }
615 
616         /*
617          * Secondly, compare the proc_id with unique IDs, if the proc_id is in
618          * the IDs, put it in the duplicate IDs.
619          */
620         for (i = 0; i < nr_unique_ids; i++) {
621                 if (unique_processor_ids[i] == proc_id) {
622                         duplicate_processor_ids[nr_duplicate_ids] = proc_id;
623                         nr_duplicate_ids++;
624                         return;
625                 }
626         }
627 
628         /*
629          * Lastly, the proc_id is a unique ID, put it in the unique IDs.
630          */
631         unique_processor_ids[nr_unique_ids] = proc_id;
632         nr_unique_ids++;
633 }
634 
635 static acpi_status __init acpi_processor_ids_walk(acpi_handle handle,
636                                                   u32 lvl,
637                                                   void *context,
638                                                   void **rv)
639 {
640         acpi_status status;
641         union acpi_object object = { 0 };
642         struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
643 
644         status = acpi_evaluate_object(handle, NULL, NULL, &buffer);
645         if (ACPI_FAILURE(status))
646                 acpi_handle_info(handle, "Not get the processor object\n");
647         else
648                 processor_validated_ids_update(object.processor.proc_id);
649 
650         return AE_OK;
651 }
652 
653 static void __init acpi_processor_check_duplicates(void)
654 {
655         /* Search all processor nodes in ACPI namespace */
656         acpi_walk_namespace(ACPI_TYPE_PROCESSOR, ACPI_ROOT_OBJECT,
657                                                 ACPI_UINT32_MAX,
658                                                 acpi_processor_ids_walk,
659                                                 NULL, NULL, NULL);
660 }
661 
662 bool __init acpi_processor_validate_proc_id(int proc_id)
663 {
664         int i;
665 
666         /*
667          * compare the proc_id with duplicate IDs, if the proc_id is already
668          * in the duplicate IDs, return true, otherwise, return false.
669          */
670         for (i = 0; i < nr_duplicate_ids; i++) {
671                 if (duplicate_processor_ids[i] == proc_id)
672                         return true;
673         }
674         return false;
675 }
676 
677 void __init acpi_processor_init(void)
678 {
679         acpi_processor_check_duplicates();
680         acpi_scan_add_handler_with_hotplug(&processor_handler, "processor");
681         acpi_scan_add_handler(&processor_container_handler);
682 }
683 

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