2 * processor_perflib.c - ACPI Processor P-States Library ($Revision: 71 $)
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
11 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License as published by
15 * the Free Software Foundation; either version 2 of the License, or (at
16 * your option) any later version.
18 * This program is distributed in the hope that it will be useful, but
19 * WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
21 * General Public License for more details.
23 * You should have received a copy of the GNU General Public License along
24 * with this program; if not, write to the Free Software Foundation, Inc.,
25 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
29 #include <linux/kernel.h>
30 #include <linux/module.h>
31 #include <linux/init.h>
32 #include <linux/cpufreq.h>
34 #ifdef CONFIG_X86_ACPI_CPUFREQ_PROC_INTF
35 #include <linux/proc_fs.h>
36 #include <linux/seq_file.h>
37 #include <linux/mutex.h>
39 #include <asm/uaccess.h>
42 #include <acpi/acpi_bus.h>
43 #include <acpi/processor.h>
45 #define ACPI_PROCESSOR_COMPONENT 0x01000000
46 #define ACPI_PROCESSOR_CLASS "processor"
47 #define ACPI_PROCESSOR_DRIVER_NAME "ACPI Processor Driver"
48 #define ACPI_PROCESSOR_FILE_PERFORMANCE "performance"
49 #define _COMPONENT ACPI_PROCESSOR_COMPONENT
50 ACPI_MODULE_NAME("acpi_processor")
52 static DEFINE_MUTEX(performance_mutex);
55 * _PPC support is implemented as a CPUfreq policy notifier:
56 * This means each time a CPUfreq driver registered also with
57 * the ACPI core is asked to change the speed policy, the maximum
58 * value is adjusted so that it is within the platform limit.
60 * Also, when a new platform limit value is detected, the CPUfreq
61 * policy is adjusted accordingly.
64 #define PPC_REGISTERED 1
67 static int acpi_processor_ppc_status = 0;
69 static int acpi_processor_ppc_notifier(struct notifier_block *nb,
70 unsigned long event, void *data)
72 struct cpufreq_policy *policy = data;
73 struct acpi_processor *pr;
76 mutex_lock(&performance_mutex);
78 if (event != CPUFREQ_INCOMPATIBLE)
81 pr = processors[policy->cpu];
82 if (!pr || !pr->performance)
85 ppc = (unsigned int)pr->performance_platform_limit;
89 if (ppc > pr->performance->state_count)
92 cpufreq_verify_within_limits(policy, 0,
93 pr->performance->states[ppc].
94 core_frequency * 1000);
97 mutex_unlock(&performance_mutex);
102 static struct notifier_block acpi_ppc_notifier_block = {
103 .notifier_call = acpi_processor_ppc_notifier,
106 static int acpi_processor_get_platform_limit(struct acpi_processor *pr)
108 acpi_status status = 0;
109 unsigned long ppc = 0;
111 ACPI_FUNCTION_TRACE("acpi_processor_get_platform_limit");
114 return_VALUE(-EINVAL);
117 * _PPC indicates the maximum state currently supported by the platform
118 * (e.g. 0 = states 0..n; 1 = states 1..n; etc.
120 status = acpi_evaluate_integer(pr->handle, "_PPC", NULL, &ppc);
122 if (status != AE_NOT_FOUND)
123 acpi_processor_ppc_status |= PPC_IN_USE;
125 if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
126 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PPC"));
127 return_VALUE(-ENODEV);
130 pr->performance_platform_limit = (int)ppc;
135 int acpi_processor_ppc_has_changed(struct acpi_processor *pr)
137 int ret = acpi_processor_get_platform_limit(pr);
141 return cpufreq_update_policy(pr->id);
144 void acpi_processor_ppc_init(void)
146 if (!cpufreq_register_notifier
147 (&acpi_ppc_notifier_block, CPUFREQ_POLICY_NOTIFIER))
148 acpi_processor_ppc_status |= PPC_REGISTERED;
151 "Warning: Processor Platform Limit not supported.\n");
154 void acpi_processor_ppc_exit(void)
156 if (acpi_processor_ppc_status & PPC_REGISTERED)
157 cpufreq_unregister_notifier(&acpi_ppc_notifier_block,
158 CPUFREQ_POLICY_NOTIFIER);
160 acpi_processor_ppc_status &= ~PPC_REGISTERED;
163 static int acpi_processor_get_performance_control(struct acpi_processor *pr)
166 acpi_status status = 0;
167 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
168 union acpi_object *pct = NULL;
169 union acpi_object obj = { 0 };
171 ACPI_FUNCTION_TRACE("acpi_processor_get_performance_control");
173 status = acpi_evaluate_object(pr->handle, "_PCT", NULL, &buffer);
174 if (ACPI_FAILURE(status)) {
175 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PCT"));
176 return_VALUE(-ENODEV);
179 pct = (union acpi_object *)buffer.pointer;
180 if (!pct || (pct->type != ACPI_TYPE_PACKAGE)
181 || (pct->package.count != 2)) {
182 printk(KERN_ERR PREFIX "Invalid _PCT data\n");
191 obj = pct->package.elements[0];
193 if ((obj.type != ACPI_TYPE_BUFFER)
194 || (obj.buffer.length < sizeof(struct acpi_pct_register))
195 || (obj.buffer.pointer == NULL)) {
196 printk(KERN_ERR PREFIX "Invalid _PCT data (control_register)\n");
200 memcpy(&pr->performance->control_register, obj.buffer.pointer,
201 sizeof(struct acpi_pct_register));
207 obj = pct->package.elements[1];
209 if ((obj.type != ACPI_TYPE_BUFFER)
210 || (obj.buffer.length < sizeof(struct acpi_pct_register))
211 || (obj.buffer.pointer == NULL)) {
212 printk(KERN_ERR PREFIX "Invalid _PCT data (status_register)\n");
217 memcpy(&pr->performance->status_register, obj.buffer.pointer,
218 sizeof(struct acpi_pct_register));
221 acpi_os_free(buffer.pointer);
223 return_VALUE(result);
226 static int acpi_processor_get_performance_states(struct acpi_processor *pr)
229 acpi_status status = AE_OK;
230 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
231 struct acpi_buffer format = { sizeof("NNNNNN"), "NNNNNN" };
232 struct acpi_buffer state = { 0, NULL };
233 union acpi_object *pss = NULL;
236 ACPI_FUNCTION_TRACE("acpi_processor_get_performance_states");
238 status = acpi_evaluate_object(pr->handle, "_PSS", NULL, &buffer);
239 if (ACPI_FAILURE(status)) {
240 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PSS"));
241 return_VALUE(-ENODEV);
244 pss = (union acpi_object *)buffer.pointer;
245 if (!pss || (pss->type != ACPI_TYPE_PACKAGE)) {
246 printk(KERN_ERR PREFIX "Invalid _PSS data\n");
251 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d performance states\n",
252 pss->package.count));
254 pr->performance->state_count = pss->package.count;
255 pr->performance->states =
256 kmalloc(sizeof(struct acpi_processor_px) * pss->package.count,
258 if (!pr->performance->states) {
263 for (i = 0; i < pr->performance->state_count; i++) {
265 struct acpi_processor_px *px = &(pr->performance->states[i]);
267 state.length = sizeof(struct acpi_processor_px);
270 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Extracting state %d\n", i));
272 status = acpi_extract_package(&(pss->package.elements[i]),
274 if (ACPI_FAILURE(status)) {
275 ACPI_EXCEPTION((AE_INFO, status, "Invalid _PSS data"));
277 kfree(pr->performance->states);
281 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
282 "State [%d]: core_frequency[%d] power[%d] transition_latency[%d] bus_master_latency[%d] control[0x%x] status[0x%x]\n",
284 (u32) px->core_frequency,
286 (u32) px->transition_latency,
287 (u32) px->bus_master_latency,
288 (u32) px->control, (u32) px->status));
290 if (!px->core_frequency) {
291 printk(KERN_ERR PREFIX
292 "Invalid _PSS data: freq is zero\n");
294 kfree(pr->performance->states);
300 acpi_os_free(buffer.pointer);
302 return_VALUE(result);
305 static int acpi_processor_get_performance_info(struct acpi_processor *pr)
308 acpi_status status = AE_OK;
309 acpi_handle handle = NULL;
311 ACPI_FUNCTION_TRACE("acpi_processor_get_performance_info");
313 if (!pr || !pr->performance || !pr->handle)
314 return_VALUE(-EINVAL);
316 status = acpi_get_handle(pr->handle, "_PCT", &handle);
317 if (ACPI_FAILURE(status)) {
318 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
319 "ACPI-based processor performance control unavailable\n"));
320 return_VALUE(-ENODEV);
323 result = acpi_processor_get_performance_control(pr);
325 return_VALUE(result);
327 result = acpi_processor_get_performance_states(pr);
329 return_VALUE(result);
331 result = acpi_processor_get_platform_limit(pr);
333 return_VALUE(result);
338 int acpi_processor_notify_smm(struct module *calling_module)
341 static int is_done = 0;
343 ACPI_FUNCTION_TRACE("acpi_processor_notify_smm");
345 if (!(acpi_processor_ppc_status & PPC_REGISTERED))
346 return_VALUE(-EBUSY);
348 if (!try_module_get(calling_module))
349 return_VALUE(-EINVAL);
351 /* is_done is set to negative if an error occured,
352 * and to postitive if _no_ error occured, but SMM
353 * was already notified. This avoids double notification
354 * which might lead to unexpected results...
357 module_put(calling_module);
359 } else if (is_done < 0) {
360 module_put(calling_module);
361 return_VALUE(is_done);
366 /* Can't write pstate_cnt to smi_cmd if either value is zero */
367 if ((!acpi_fadt.smi_cmd) || (!acpi_fadt.pstate_cnt)) {
368 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No SMI port or pstate_cnt\n"));
369 module_put(calling_module);
373 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
374 "Writing pstate_cnt [0x%x] to smi_cmd [0x%x]\n",
375 acpi_fadt.pstate_cnt, acpi_fadt.smi_cmd));
377 /* FADT v1 doesn't support pstate_cnt, many BIOS vendors use
378 * it anyway, so we need to support it... */
379 if (acpi_fadt_is_v1) {
380 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
381 "Using v1.0 FADT reserved value for pstate_cnt\n"));
384 status = acpi_os_write_port(acpi_fadt.smi_cmd,
385 (u32) acpi_fadt.pstate_cnt, 8);
386 if (ACPI_FAILURE(status)) {
387 ACPI_EXCEPTION((AE_INFO, status,
388 "Failed to write pstate_cnt [0x%x] to "
389 "smi_cmd [0x%x]", acpi_fadt.pstate_cnt,
391 module_put(calling_module);
392 return_VALUE(status);
395 /* Success. If there's no _PPC, we need to fear nothing, so
396 * we can allow the cpufreq driver to be rmmod'ed. */
399 if (!(acpi_processor_ppc_status & PPC_IN_USE))
400 module_put(calling_module);
405 EXPORT_SYMBOL(acpi_processor_notify_smm);
407 #ifdef CONFIG_X86_ACPI_CPUFREQ_PROC_INTF
408 /* /proc/acpi/processor/../performance interface (DEPRECATED) */
410 static int acpi_processor_perf_open_fs(struct inode *inode, struct file *file);
411 static struct file_operations acpi_processor_perf_fops = {
412 .open = acpi_processor_perf_open_fs,
415 .release = single_release,
418 static int acpi_processor_perf_seq_show(struct seq_file *seq, void *offset)
420 struct acpi_processor *pr = (struct acpi_processor *)seq->private;
423 ACPI_FUNCTION_TRACE("acpi_processor_perf_seq_show");
428 if (!pr->performance) {
429 seq_puts(seq, "<not supported>\n");
433 seq_printf(seq, "state count: %d\n"
434 "active state: P%d\n",
435 pr->performance->state_count, pr->performance->state);
437 seq_puts(seq, "states:\n");
438 for (i = 0; i < pr->performance->state_count; i++)
440 " %cP%d: %d MHz, %d mW, %d uS\n",
441 (i == pr->performance->state ? '*' : ' '), i,
442 (u32) pr->performance->states[i].core_frequency,
443 (u32) pr->performance->states[i].power,
444 (u32) pr->performance->states[i].transition_latency);
450 static int acpi_processor_perf_open_fs(struct inode *inode, struct file *file)
452 return single_open(file, acpi_processor_perf_seq_show,
457 acpi_processor_write_performance(struct file *file,
458 const char __user * buffer,
459 size_t count, loff_t * data)
462 struct seq_file *m = (struct seq_file *)file->private_data;
463 struct acpi_processor *pr = (struct acpi_processor *)m->private;
464 struct acpi_processor_performance *perf;
465 char state_string[12] = { '\0' };
466 unsigned int new_state = 0;
467 struct cpufreq_policy policy;
469 ACPI_FUNCTION_TRACE("acpi_processor_write_performance");
471 if (!pr || (count > sizeof(state_string) - 1))
472 return_VALUE(-EINVAL);
474 perf = pr->performance;
476 return_VALUE(-EINVAL);
478 if (copy_from_user(state_string, buffer, count))
479 return_VALUE(-EFAULT);
481 state_string[count] = '\0';
482 new_state = simple_strtoul(state_string, NULL, 0);
484 if (new_state >= perf->state_count)
485 return_VALUE(-EINVAL);
487 cpufreq_get_policy(&policy, pr->id);
490 policy.min = perf->states[new_state].core_frequency * 1000;
491 policy.max = perf->states[new_state].core_frequency * 1000;
493 result = cpufreq_set_policy(&policy);
495 return_VALUE(result);
500 static void acpi_cpufreq_add_file(struct acpi_processor *pr)
502 struct proc_dir_entry *entry = NULL;
503 struct acpi_device *device = NULL;
505 ACPI_FUNCTION_TRACE("acpi_cpufreq_addfile");
507 if (acpi_bus_get_device(pr->handle, &device))
510 /* add file 'performance' [R/W] */
511 entry = create_proc_entry(ACPI_PROCESSOR_FILE_PERFORMANCE,
512 S_IFREG | S_IRUGO | S_IWUSR,
513 acpi_device_dir(device));
515 acpi_processor_perf_fops.write = acpi_processor_write_performance;
516 entry->proc_fops = &acpi_processor_perf_fops;
517 entry->data = acpi_driver_data(device);
518 entry->owner = THIS_MODULE;
523 static void acpi_cpufreq_remove_file(struct acpi_processor *pr)
525 struct acpi_device *device = NULL;
527 ACPI_FUNCTION_TRACE("acpi_cpufreq_addfile");
529 if (acpi_bus_get_device(pr->handle, &device))
532 /* remove file 'performance' */
533 remove_proc_entry(ACPI_PROCESSOR_FILE_PERFORMANCE,
534 acpi_device_dir(device));
540 static void acpi_cpufreq_add_file(struct acpi_processor *pr)
544 static void acpi_cpufreq_remove_file(struct acpi_processor *pr)
548 #endif /* CONFIG_X86_ACPI_CPUFREQ_PROC_INTF */
550 static int acpi_processor_get_psd(struct acpi_processor *pr)
553 acpi_status status = AE_OK;
554 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
555 struct acpi_buffer format = {sizeof("NNNNN"), "NNNNN"};
556 struct acpi_buffer state = {0, NULL};
557 union acpi_object *psd = NULL;
558 struct acpi_psd_package *pdomain;
560 status = acpi_evaluate_object(pr->handle, "_PSD", NULL, &buffer);
561 if (ACPI_FAILURE(status)) {
565 psd = (union acpi_object *) buffer.pointer;
566 if (!psd || (psd->type != ACPI_TYPE_PACKAGE)) {
567 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _PSD data\n"));
572 if (psd->package.count != 1) {
573 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _PSD data\n"));
578 pdomain = &(pr->performance->domain_info);
580 state.length = sizeof(struct acpi_psd_package);
581 state.pointer = pdomain;
583 status = acpi_extract_package(&(psd->package.elements[0]),
585 if (ACPI_FAILURE(status)) {
586 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _PSD data\n"));
591 if (pdomain->num_entries != ACPI_PSD_REV0_ENTRIES) {
592 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Unknown _PSD:num_entries\n"));
597 if (pdomain->revision != ACPI_PSD_REV0_REVISION) {
598 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Unknown _PSD:revision\n"));
604 acpi_os_free(buffer.pointer);
608 int acpi_processor_preregister_performance(
609 struct acpi_processor_performance **performance)
611 int count, count_target;
614 cpumask_t covered_cpus;
615 struct acpi_processor *pr;
616 struct acpi_psd_package *pdomain;
617 struct acpi_processor *match_pr;
618 struct acpi_psd_package *match_pdomain;
620 mutex_lock(&performance_mutex);
624 /* Call _PSD for all CPUs */
625 for_each_possible_cpu(i) {
628 /* Look only at processors in ACPI namespace */
632 if (pr->performance) {
637 if (!performance || !performance[i]) {
642 pr->performance = performance[i];
643 cpu_set(i, pr->performance->shared_cpu_map);
644 if (acpi_processor_get_psd(pr)) {
653 * Now that we have _PSD data from all CPUs, lets setup P-state
656 for_each_possible_cpu(i) {
661 /* Basic validity check for domain info */
662 pdomain = &(pr->performance->domain_info);
663 if ((pdomain->revision != ACPI_PSD_REV0_REVISION) ||
664 (pdomain->num_entries != ACPI_PSD_REV0_ENTRIES)) {
668 if (pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ALL &&
669 pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ANY &&
670 pdomain->coord_type != DOMAIN_COORD_TYPE_HW_ALL) {
676 cpus_clear(covered_cpus);
677 for_each_possible_cpu(i) {
682 if (cpu_isset(i, covered_cpus))
685 pdomain = &(pr->performance->domain_info);
686 cpu_set(i, pr->performance->shared_cpu_map);
687 cpu_set(i, covered_cpus);
688 if (pdomain->num_processors <= 1)
691 /* Validate the Domain info */
692 count_target = pdomain->num_processors;
694 if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ALL)
695 pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL;
696 else if (pdomain->coord_type == DOMAIN_COORD_TYPE_HW_ALL)
697 pr->performance->shared_type = CPUFREQ_SHARED_TYPE_HW;
698 else if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ANY)
699 pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ANY;
701 for_each_possible_cpu(j) {
705 match_pr = processors[j];
709 match_pdomain = &(match_pr->performance->domain_info);
710 if (match_pdomain->domain != pdomain->domain)
713 /* Here i and j are in the same domain */
715 if (match_pdomain->num_processors != count_target) {
720 if (pdomain->coord_type != match_pdomain->coord_type) {
725 cpu_set(j, covered_cpus);
726 cpu_set(j, pr->performance->shared_cpu_map);
730 for_each_possible_cpu(j) {
734 match_pr = processors[j];
738 match_pdomain = &(match_pr->performance->domain_info);
739 if (match_pdomain->domain != pdomain->domain)
742 match_pr->performance->shared_type =
743 pr->performance->shared_type;
744 match_pr->performance->shared_cpu_map =
745 pr->performance->shared_cpu_map;
751 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error while parsing _PSD domain information. Assuming no coordination\n"));
754 for_each_possible_cpu(i) {
756 if (!pr || !pr->performance)
759 /* Assume no coordination on any error parsing domain info */
761 cpus_clear(pr->performance->shared_cpu_map);
762 cpu_set(i, pr->performance->shared_cpu_map);
763 pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL;
765 pr->performance = NULL; /* Will be set for real in register */
768 mutex_unlock(&performance_mutex);
771 EXPORT_SYMBOL(acpi_processor_preregister_performance);
775 acpi_processor_register_performance(struct acpi_processor_performance
776 *performance, unsigned int cpu)
778 struct acpi_processor *pr;
780 ACPI_FUNCTION_TRACE("acpi_processor_register_performance");
782 if (!(acpi_processor_ppc_status & PPC_REGISTERED))
783 return_VALUE(-EINVAL);
785 mutex_lock(&performance_mutex);
787 pr = processors[cpu];
789 mutex_unlock(&performance_mutex);
790 return_VALUE(-ENODEV);
793 if (pr->performance) {
794 mutex_unlock(&performance_mutex);
795 return_VALUE(-EBUSY);
798 WARN_ON(!performance);
800 pr->performance = performance;
802 if (acpi_processor_get_performance_info(pr)) {
803 pr->performance = NULL;
804 mutex_unlock(&performance_mutex);
808 acpi_cpufreq_add_file(pr);
810 mutex_unlock(&performance_mutex);
814 EXPORT_SYMBOL(acpi_processor_register_performance);
817 acpi_processor_unregister_performance(struct acpi_processor_performance
818 *performance, unsigned int cpu)
820 struct acpi_processor *pr;
822 ACPI_FUNCTION_TRACE("acpi_processor_unregister_performance");
824 mutex_lock(&performance_mutex);
826 pr = processors[cpu];
828 mutex_unlock(&performance_mutex);
833 kfree(pr->performance->states);
834 pr->performance = NULL;
836 acpi_cpufreq_remove_file(pr);
838 mutex_unlock(&performance_mutex);
843 EXPORT_SYMBOL(acpi_processor_unregister_performance);