~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

TOMOYO Linux Cross Reference
Linux/arch/ia64/kernel/cpufreq/acpi-cpufreq.c

Version: ~ [ linux-5.11 ] ~ [ linux-5.10.17 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.99 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.176 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.221 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.257 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.257 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.85 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  1 /*
  2  * arch/ia64/kernel/cpufreq/acpi-cpufreq.c
  3  * This file provides the ACPI based P-state support. This
  4  * module works with generic cpufreq infrastructure. Most of
  5  * the code is based on i386 version
  6  * (arch/i386/kernel/cpu/cpufreq/acpi-cpufreq.c)
  7  *
  8  * Copyright (C) 2005 Intel Corp
  9  *      Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
 10  */
 11 
 12 #include <linux/kernel.h>
 13 #include <linux/module.h>
 14 #include <linux/init.h>
 15 #include <linux/cpufreq.h>
 16 #include <linux/proc_fs.h>
 17 #include <linux/seq_file.h>
 18 #include <asm/io.h>
 19 #include <asm/uaccess.h>
 20 #include <asm/pal.h>
 21 
 22 #include <linux/acpi.h>
 23 #include <acpi/processor.h>
 24 
 25 #define dprintk(msg...) cpufreq_debug_printk(CPUFREQ_DEBUG_DRIVER, "acpi-cpufreq", msg)
 26 
 27 MODULE_AUTHOR("Venkatesh Pallipadi");
 28 MODULE_DESCRIPTION("ACPI Processor P-States Driver");
 29 MODULE_LICENSE("GPL");
 30 
 31 
 32 struct cpufreq_acpi_io {
 33         struct acpi_processor_performance       acpi_data;
 34         struct cpufreq_frequency_table          *freq_table;
 35         unsigned int                            resume;
 36 };
 37 
 38 static struct cpufreq_acpi_io   *acpi_io_data[NR_CPUS];
 39 
 40 static struct cpufreq_driver acpi_cpufreq_driver;
 41 
 42 
 43 static int
 44 processor_set_pstate (
 45         u32     value)
 46 {
 47         s64 retval;
 48 
 49         dprintk("processor_set_pstate\n");
 50 
 51         retval = ia64_pal_set_pstate((u64)value);
 52 
 53         if (retval) {
 54                 dprintk("Failed to set freq to 0x%x, with error 0x%lx\n",
 55                         value, retval);
 56                 return -ENODEV;
 57         }
 58         return (int)retval;
 59 }
 60 
 61 
 62 static int
 63 processor_get_pstate (
 64         u32     *value)
 65 {
 66         u64     pstate_index = 0;
 67         s64     retval;
 68 
 69         dprintk("processor_get_pstate\n");
 70 
 71         retval = ia64_pal_get_pstate(&pstate_index,
 72                                      PAL_GET_PSTATE_TYPE_INSTANT);
 73         *value = (u32) pstate_index;
 74 
 75         if (retval)
 76                 dprintk("Failed to get current freq with "
 77                         "error 0x%lx, idx 0x%x\n", retval, *value);
 78 
 79         return (int)retval;
 80 }
 81 
 82 
 83 /* To be used only after data->acpi_data is initialized */
 84 static unsigned
 85 extract_clock (
 86         struct cpufreq_acpi_io *data,
 87         unsigned value,
 88         unsigned int cpu)
 89 {
 90         unsigned long i;
 91 
 92         dprintk("extract_clock\n");
 93 
 94         for (i = 0; i < data->acpi_data.state_count; i++) {
 95                 if (value == data->acpi_data.states[i].status)
 96                         return data->acpi_data.states[i].core_frequency;
 97         }
 98         return data->acpi_data.states[i-1].core_frequency;
 99 }
100 
101 
102 static unsigned int
103 processor_get_freq (
104         struct cpufreq_acpi_io  *data,
105         unsigned int            cpu)
106 {
107         int                     ret = 0;
108         u32                     value = 0;
109         cpumask_t               saved_mask;
110         unsigned long           clock_freq;
111 
112         dprintk("processor_get_freq\n");
113 
114         saved_mask = current->cpus_allowed;
115         set_cpus_allowed(current, cpumask_of_cpu(cpu));
116         if (smp_processor_id() != cpu)
117                 goto migrate_end;
118 
119         /* processor_get_pstate gets the instantaneous frequency */
120         ret = processor_get_pstate(&value);
121 
122         if (ret) {
123                 set_cpus_allowed(current, saved_mask);
124                 printk(KERN_WARNING "get performance failed with error %d\n",
125                        ret);
126                 ret = 0;
127                 goto migrate_end;
128         }
129         clock_freq = extract_clock(data, value, cpu);
130         ret = (clock_freq*1000);
131 
132 migrate_end:
133         set_cpus_allowed(current, saved_mask);
134         return ret;
135 }
136 
137 
138 static int
139 processor_set_freq (
140         struct cpufreq_acpi_io  *data,
141         unsigned int            cpu,
142         int                     state)
143 {
144         int                     ret = 0;
145         u32                     value = 0;
146         struct cpufreq_freqs    cpufreq_freqs;
147         cpumask_t               saved_mask;
148         int                     retval;
149 
150         dprintk("processor_set_freq\n");
151 
152         saved_mask = current->cpus_allowed;
153         set_cpus_allowed(current, cpumask_of_cpu(cpu));
154         if (smp_processor_id() != cpu) {
155                 retval = -EAGAIN;
156                 goto migrate_end;
157         }
158 
159         if (state == data->acpi_data.state) {
160                 if (unlikely(data->resume)) {
161                         dprintk("Called after resume, resetting to P%d\n", state);
162                         data->resume = 0;
163                 } else {
164                         dprintk("Already at target state (P%d)\n", state);
165                         retval = 0;
166                         goto migrate_end;
167                 }
168         }
169 
170         dprintk("Transitioning from P%d to P%d\n",
171                 data->acpi_data.state, state);
172 
173         /* cpufreq frequency struct */
174         cpufreq_freqs.cpu = cpu;
175         cpufreq_freqs.old = data->freq_table[data->acpi_data.state].frequency;
176         cpufreq_freqs.new = data->freq_table[state].frequency;
177 
178         /* notify cpufreq */
179         cpufreq_notify_transition(&cpufreq_freqs, CPUFREQ_PRECHANGE);
180 
181         /*
182          * First we write the target state's 'control' value to the
183          * control_register.
184          */
185 
186         value = (u32) data->acpi_data.states[state].control;
187 
188         dprintk("Transitioning to state: 0x%08x\n", value);
189 
190         ret = processor_set_pstate(value);
191         if (ret) {
192                 unsigned int tmp = cpufreq_freqs.new;
193                 cpufreq_notify_transition(&cpufreq_freqs, CPUFREQ_POSTCHANGE);
194                 cpufreq_freqs.new = cpufreq_freqs.old;
195                 cpufreq_freqs.old = tmp;
196                 cpufreq_notify_transition(&cpufreq_freqs, CPUFREQ_PRECHANGE);
197                 cpufreq_notify_transition(&cpufreq_freqs, CPUFREQ_POSTCHANGE);
198                 printk(KERN_WARNING "Transition failed with error %d\n", ret);
199                 retval = -ENODEV;
200                 goto migrate_end;
201         }
202 
203         cpufreq_notify_transition(&cpufreq_freqs, CPUFREQ_POSTCHANGE);
204 
205         data->acpi_data.state = state;
206 
207         retval = 0;
208 
209 migrate_end:
210         set_cpus_allowed(current, saved_mask);
211         return (retval);
212 }
213 
214 
215 static unsigned int
216 acpi_cpufreq_get (
217         unsigned int            cpu)
218 {
219         struct cpufreq_acpi_io *data = acpi_io_data[cpu];
220 
221         dprintk("acpi_cpufreq_get\n");
222 
223         return processor_get_freq(data, cpu);
224 }
225 
226 
227 static int
228 acpi_cpufreq_target (
229         struct cpufreq_policy   *policy,
230         unsigned int target_freq,
231         unsigned int relation)
232 {
233         struct cpufreq_acpi_io *data = acpi_io_data[policy->cpu];
234         unsigned int next_state = 0;
235         unsigned int result = 0;
236 
237         dprintk("acpi_cpufreq_setpolicy\n");
238 
239         result = cpufreq_frequency_table_target(policy,
240                         data->freq_table, target_freq, relation, &next_state);
241         if (result)
242                 return (result);
243 
244         result = processor_set_freq(data, policy->cpu, next_state);
245 
246         return (result);
247 }
248 
249 
250 static int
251 acpi_cpufreq_verify (
252         struct cpufreq_policy   *policy)
253 {
254         unsigned int result = 0;
255         struct cpufreq_acpi_io *data = acpi_io_data[policy->cpu];
256 
257         dprintk("acpi_cpufreq_verify\n");
258 
259         result = cpufreq_frequency_table_verify(policy,
260                         data->freq_table);
261 
262         return (result);
263 }
264 
265 
266 static int
267 acpi_cpufreq_cpu_init (
268         struct cpufreq_policy   *policy)
269 {
270         unsigned int            i;
271         unsigned int            cpu = policy->cpu;
272         struct cpufreq_acpi_io  *data;
273         unsigned int            result = 0;
274 
275         dprintk("acpi_cpufreq_cpu_init\n");
276 
277         data = kzalloc(sizeof(struct cpufreq_acpi_io), GFP_KERNEL);
278         if (!data)
279                 return (-ENOMEM);
280 
281         acpi_io_data[cpu] = data;
282 
283         result = acpi_processor_register_performance(&data->acpi_data, cpu);
284 
285         if (result)
286                 goto err_free;
287 
288         /* capability check */
289         if (data->acpi_data.state_count <= 1) {
290                 dprintk("No P-States\n");
291                 result = -ENODEV;
292                 goto err_unreg;
293         }
294 
295         if ((data->acpi_data.control_register.space_id !=
296                                         ACPI_ADR_SPACE_FIXED_HARDWARE) ||
297             (data->acpi_data.status_register.space_id !=
298                                         ACPI_ADR_SPACE_FIXED_HARDWARE)) {
299                 dprintk("Unsupported address space [%d, %d]\n",
300                         (u32) (data->acpi_data.control_register.space_id),
301                         (u32) (data->acpi_data.status_register.space_id));
302                 result = -ENODEV;
303                 goto err_unreg;
304         }
305 
306         /* alloc freq_table */
307         data->freq_table = kmalloc(sizeof(struct cpufreq_frequency_table) *
308                                    (data->acpi_data.state_count + 1),
309                                    GFP_KERNEL);
310         if (!data->freq_table) {
311                 result = -ENOMEM;
312                 goto err_unreg;
313         }
314 
315         /* detect transition latency */
316         policy->cpuinfo.transition_latency = 0;
317         for (i=0; i<data->acpi_data.state_count; i++) {
318                 if ((data->acpi_data.states[i].transition_latency * 1000) >
319                     policy->cpuinfo.transition_latency) {
320                         policy->cpuinfo.transition_latency =
321                             data->acpi_data.states[i].transition_latency * 1000;
322                 }
323         }
324         policy->cur = processor_get_freq(data, policy->cpu);
325 
326         /* table init */
327         for (i = 0; i <= data->acpi_data.state_count; i++)
328         {
329                 data->freq_table[i].index = i;
330                 if (i < data->acpi_data.state_count) {
331                         data->freq_table[i].frequency =
332                               data->acpi_data.states[i].core_frequency * 1000;
333                 } else {
334                         data->freq_table[i].frequency = CPUFREQ_TABLE_END;
335                 }
336         }
337 
338         result = cpufreq_frequency_table_cpuinfo(policy, data->freq_table);
339         if (result) {
340                 goto err_freqfree;
341         }
342 
343         /* notify BIOS that we exist */
344         acpi_processor_notify_smm(THIS_MODULE);
345 
346         printk(KERN_INFO "acpi-cpufreq: CPU%u - ACPI performance management "
347                "activated.\n", cpu);
348 
349         for (i = 0; i < data->acpi_data.state_count; i++)
350                 dprintk("     %cP%d: %d MHz, %d mW, %d uS, %d uS, 0x%x 0x%x\n",
351                         (i == data->acpi_data.state?'*':' '), i,
352                         (u32) data->acpi_data.states[i].core_frequency,
353                         (u32) data->acpi_data.states[i].power,
354                         (u32) data->acpi_data.states[i].transition_latency,
355                         (u32) data->acpi_data.states[i].bus_master_latency,
356                         (u32) data->acpi_data.states[i].status,
357                         (u32) data->acpi_data.states[i].control);
358 
359         cpufreq_frequency_table_get_attr(data->freq_table, policy->cpu);
360 
361         /* the first call to ->target() should result in us actually
362          * writing something to the appropriate registers. */
363         data->resume = 1;
364 
365         return (result);
366 
367  err_freqfree:
368         kfree(data->freq_table);
369  err_unreg:
370         acpi_processor_unregister_performance(&data->acpi_data, cpu);
371  err_free:
372         kfree(data);
373         acpi_io_data[cpu] = NULL;
374 
375         return (result);
376 }
377 
378 
379 static int
380 acpi_cpufreq_cpu_exit (
381         struct cpufreq_policy   *policy)
382 {
383         struct cpufreq_acpi_io *data = acpi_io_data[policy->cpu];
384 
385         dprintk("acpi_cpufreq_cpu_exit\n");
386 
387         if (data) {
388                 cpufreq_frequency_table_put_attr(policy->cpu);
389                 acpi_io_data[policy->cpu] = NULL;
390                 acpi_processor_unregister_performance(&data->acpi_data,
391                                                       policy->cpu);
392                 kfree(data);
393         }
394 
395         return (0);
396 }
397 
398 
399 static struct freq_attr* acpi_cpufreq_attr[] = {
400         &cpufreq_freq_attr_scaling_available_freqs,
401         NULL,
402 };
403 
404 
405 static struct cpufreq_driver acpi_cpufreq_driver = {
406         .verify         = acpi_cpufreq_verify,
407         .target         = acpi_cpufreq_target,
408         .get            = acpi_cpufreq_get,
409         .init           = acpi_cpufreq_cpu_init,
410         .exit           = acpi_cpufreq_cpu_exit,
411         .name           = "acpi-cpufreq",
412         .owner          = THIS_MODULE,
413         .attr           = acpi_cpufreq_attr,
414 };
415 
416 
417 static int __init
418 acpi_cpufreq_init (void)
419 {
420         dprintk("acpi_cpufreq_init\n");
421 
422         return cpufreq_register_driver(&acpi_cpufreq_driver);
423 }
424 
425 
426 static void __exit
427 acpi_cpufreq_exit (void)
428 {
429         dprintk("acpi_cpufreq_exit\n");
430 
431         cpufreq_unregister_driver(&acpi_cpufreq_driver);
432         return;
433 }
434 
435 
436 late_initcall(acpi_cpufreq_init);
437 module_exit(acpi_cpufreq_exit);
438 
439 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp