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91#include <linux/module.h>
92#include <linux/slab.h>
93#include <linux/perf_event.h>
94#include <asm/cpu_device_id.h>
95#include <asm/intel-family.h>
96#include "../perf_event.h"
97
98MODULE_LICENSE("GPL");
99
100#define DEFINE_CSTATE_FORMAT_ATTR(_var, _name, _format) \
101static ssize_t __cstate_##_var##_show(struct kobject *kobj, \
102 struct kobj_attribute *attr, \
103 char *page) \
104{ \
105 BUILD_BUG_ON(sizeof(_format) >= PAGE_SIZE); \
106 return sprintf(page, _format "\n"); \
107} \
108static struct kobj_attribute format_attr_##_var = \
109 __ATTR(_name, 0444, __cstate_##_var##_show, NULL)
110
111static ssize_t cstate_get_attr_cpumask(struct device *dev,
112 struct device_attribute *attr,
113 char *buf);
114
115
116struct cstate_model {
117 unsigned long core_events;
118 unsigned long pkg_events;
119 unsigned long quirks;
120};
121
122
123#define SLM_PKG_C6_USE_C7_MSR (1UL << 0)
124#define KNL_CORE_C6_MSR (1UL << 1)
125
126struct perf_cstate_msr {
127 u64 msr;
128 struct perf_pmu_events_attr *attr;
129};
130
131
132
133static struct pmu cstate_core_pmu;
134static bool has_cstate_core;
135
136enum perf_cstate_core_events {
137 PERF_CSTATE_CORE_C1_RES = 0,
138 PERF_CSTATE_CORE_C3_RES,
139 PERF_CSTATE_CORE_C6_RES,
140 PERF_CSTATE_CORE_C7_RES,
141
142 PERF_CSTATE_CORE_EVENT_MAX,
143};
144
145PMU_EVENT_ATTR_STRING(c1-residency, evattr_cstate_core_c1, "event=0x00");
146PMU_EVENT_ATTR_STRING(c3-residency, evattr_cstate_core_c3, "event=0x01");
147PMU_EVENT_ATTR_STRING(c6-residency, evattr_cstate_core_c6, "event=0x02");
148PMU_EVENT_ATTR_STRING(c7-residency, evattr_cstate_core_c7, "event=0x03");
149
150static struct perf_cstate_msr core_msr[] = {
151 [PERF_CSTATE_CORE_C1_RES] = { MSR_CORE_C1_RES, &evattr_cstate_core_c1 },
152 [PERF_CSTATE_CORE_C3_RES] = { MSR_CORE_C3_RESIDENCY, &evattr_cstate_core_c3 },
153 [PERF_CSTATE_CORE_C6_RES] = { MSR_CORE_C6_RESIDENCY, &evattr_cstate_core_c6 },
154 [PERF_CSTATE_CORE_C7_RES] = { MSR_CORE_C7_RESIDENCY, &evattr_cstate_core_c7 },
155};
156
157static struct attribute *core_events_attrs[PERF_CSTATE_CORE_EVENT_MAX + 1] = {
158 NULL,
159};
160
161static struct attribute_group core_events_attr_group = {
162 .name = "events",
163 .attrs = core_events_attrs,
164};
165
166DEFINE_CSTATE_FORMAT_ATTR(core_event, event, "config:0-63");
167static struct attribute *core_format_attrs[] = {
168 &format_attr_core_event.attr,
169 NULL,
170};
171
172static struct attribute_group core_format_attr_group = {
173 .name = "format",
174 .attrs = core_format_attrs,
175};
176
177static cpumask_t cstate_core_cpu_mask;
178static DEVICE_ATTR(cpumask, S_IRUGO, cstate_get_attr_cpumask, NULL);
179
180static struct attribute *cstate_cpumask_attrs[] = {
181 &dev_attr_cpumask.attr,
182 NULL,
183};
184
185static struct attribute_group cpumask_attr_group = {
186 .attrs = cstate_cpumask_attrs,
187};
188
189static const struct attribute_group *core_attr_groups[] = {
190 &core_events_attr_group,
191 &core_format_attr_group,
192 &cpumask_attr_group,
193 NULL,
194};
195
196
197static struct pmu cstate_pkg_pmu;
198static bool has_cstate_pkg;
199
200enum perf_cstate_pkg_events {
201 PERF_CSTATE_PKG_C2_RES = 0,
202 PERF_CSTATE_PKG_C3_RES,
203 PERF_CSTATE_PKG_C6_RES,
204 PERF_CSTATE_PKG_C7_RES,
205 PERF_CSTATE_PKG_C8_RES,
206 PERF_CSTATE_PKG_C9_RES,
207 PERF_CSTATE_PKG_C10_RES,
208
209 PERF_CSTATE_PKG_EVENT_MAX,
210};
211
212PMU_EVENT_ATTR_STRING(c2-residency, evattr_cstate_pkg_c2, "event=0x00");
213PMU_EVENT_ATTR_STRING(c3-residency, evattr_cstate_pkg_c3, "event=0x01");
214PMU_EVENT_ATTR_STRING(c6-residency, evattr_cstate_pkg_c6, "event=0x02");
215PMU_EVENT_ATTR_STRING(c7-residency, evattr_cstate_pkg_c7, "event=0x03");
216PMU_EVENT_ATTR_STRING(c8-residency, evattr_cstate_pkg_c8, "event=0x04");
217PMU_EVENT_ATTR_STRING(c9-residency, evattr_cstate_pkg_c9, "event=0x05");
218PMU_EVENT_ATTR_STRING(c10-residency, evattr_cstate_pkg_c10, "event=0x06");
219
220static struct perf_cstate_msr pkg_msr[] = {
221 [PERF_CSTATE_PKG_C2_RES] = { MSR_PKG_C2_RESIDENCY, &evattr_cstate_pkg_c2 },
222 [PERF_CSTATE_PKG_C3_RES] = { MSR_PKG_C3_RESIDENCY, &evattr_cstate_pkg_c3 },
223 [PERF_CSTATE_PKG_C6_RES] = { MSR_PKG_C6_RESIDENCY, &evattr_cstate_pkg_c6 },
224 [PERF_CSTATE_PKG_C7_RES] = { MSR_PKG_C7_RESIDENCY, &evattr_cstate_pkg_c7 },
225 [PERF_CSTATE_PKG_C8_RES] = { MSR_PKG_C8_RESIDENCY, &evattr_cstate_pkg_c8 },
226 [PERF_CSTATE_PKG_C9_RES] = { MSR_PKG_C9_RESIDENCY, &evattr_cstate_pkg_c9 },
227 [PERF_CSTATE_PKG_C10_RES] = { MSR_PKG_C10_RESIDENCY, &evattr_cstate_pkg_c10 },
228};
229
230static struct attribute *pkg_events_attrs[PERF_CSTATE_PKG_EVENT_MAX + 1] = {
231 NULL,
232};
233
234static struct attribute_group pkg_events_attr_group = {
235 .name = "events",
236 .attrs = pkg_events_attrs,
237};
238
239DEFINE_CSTATE_FORMAT_ATTR(pkg_event, event, "config:0-63");
240static struct attribute *pkg_format_attrs[] = {
241 &format_attr_pkg_event.attr,
242 NULL,
243};
244static struct attribute_group pkg_format_attr_group = {
245 .name = "format",
246 .attrs = pkg_format_attrs,
247};
248
249static cpumask_t cstate_pkg_cpu_mask;
250
251static const struct attribute_group *pkg_attr_groups[] = {
252 &pkg_events_attr_group,
253 &pkg_format_attr_group,
254 &cpumask_attr_group,
255 NULL,
256};
257
258static ssize_t cstate_get_attr_cpumask(struct device *dev,
259 struct device_attribute *attr,
260 char *buf)
261{
262 struct pmu *pmu = dev_get_drvdata(dev);
263
264 if (pmu == &cstate_core_pmu)
265 return cpumap_print_to_pagebuf(true, buf, &cstate_core_cpu_mask);
266 else if (pmu == &cstate_pkg_pmu)
267 return cpumap_print_to_pagebuf(true, buf, &cstate_pkg_cpu_mask);
268 else
269 return 0;
270}
271
272static int cstate_pmu_event_init(struct perf_event *event)
273{
274 u64 cfg = event->attr.config;
275 int cpu;
276
277 if (event->attr.type != event->pmu->type)
278 return -ENOENT;
279
280
281 if (event->attr.exclude_user ||
282 event->attr.exclude_kernel ||
283 event->attr.exclude_hv ||
284 event->attr.exclude_idle ||
285 event->attr.exclude_host ||
286 event->attr.exclude_guest ||
287 event->attr.sample_period)
288 return -EINVAL;
289
290 if (event->cpu < 0)
291 return -EINVAL;
292
293 if (event->pmu == &cstate_core_pmu) {
294 if (cfg >= PERF_CSTATE_CORE_EVENT_MAX)
295 return -EINVAL;
296 if (!core_msr[cfg].attr)
297 return -EINVAL;
298 event->hw.event_base = core_msr[cfg].msr;
299 cpu = cpumask_any_and(&cstate_core_cpu_mask,
300 topology_sibling_cpumask(event->cpu));
301 } else if (event->pmu == &cstate_pkg_pmu) {
302 if (cfg >= PERF_CSTATE_PKG_EVENT_MAX)
303 return -EINVAL;
304 if (!pkg_msr[cfg].attr)
305 return -EINVAL;
306 event->hw.event_base = pkg_msr[cfg].msr;
307 cpu = cpumask_any_and(&cstate_pkg_cpu_mask,
308 topology_core_cpumask(event->cpu));
309 } else {
310 return -ENOENT;
311 }
312
313 if (cpu >= nr_cpu_ids)
314 return -ENODEV;
315
316 event->cpu = cpu;
317 event->hw.config = cfg;
318 event->hw.idx = -1;
319 return 0;
320}
321
322static inline u64 cstate_pmu_read_counter(struct perf_event *event)
323{
324 u64 val;
325
326 rdmsrl(event->hw.event_base, val);
327 return val;
328}
329
330static void cstate_pmu_event_update(struct perf_event *event)
331{
332 struct hw_perf_event *hwc = &event->hw;
333 u64 prev_raw_count, new_raw_count;
334
335again:
336 prev_raw_count = local64_read(&hwc->prev_count);
337 new_raw_count = cstate_pmu_read_counter(event);
338
339 if (local64_cmpxchg(&hwc->prev_count, prev_raw_count,
340 new_raw_count) != prev_raw_count)
341 goto again;
342
343 local64_add(new_raw_count - prev_raw_count, &event->count);
344}
345
346static void cstate_pmu_event_start(struct perf_event *event, int mode)
347{
348 local64_set(&event->hw.prev_count, cstate_pmu_read_counter(event));
349}
350
351static void cstate_pmu_event_stop(struct perf_event *event, int mode)
352{
353 cstate_pmu_event_update(event);
354}
355
356static void cstate_pmu_event_del(struct perf_event *event, int mode)
357{
358 cstate_pmu_event_stop(event, PERF_EF_UPDATE);
359}
360
361static int cstate_pmu_event_add(struct perf_event *event, int mode)
362{
363 if (mode & PERF_EF_START)
364 cstate_pmu_event_start(event, mode);
365
366 return 0;
367}
368
369
370
371
372
373static int cstate_cpu_exit(unsigned int cpu)
374{
375 unsigned int target;
376
377 if (has_cstate_core &&
378 cpumask_test_and_clear_cpu(cpu, &cstate_core_cpu_mask)) {
379
380 target = cpumask_any_but(topology_sibling_cpumask(cpu), cpu);
381
382 if (target < nr_cpu_ids) {
383 cpumask_set_cpu(target, &cstate_core_cpu_mask);
384 perf_pmu_migrate_context(&cstate_core_pmu, cpu, target);
385 }
386 }
387
388 if (has_cstate_pkg &&
389 cpumask_test_and_clear_cpu(cpu, &cstate_pkg_cpu_mask)) {
390
391 target = cpumask_any_but(topology_core_cpumask(cpu), cpu);
392
393 if (target < nr_cpu_ids) {
394 cpumask_set_cpu(target, &cstate_pkg_cpu_mask);
395 perf_pmu_migrate_context(&cstate_pkg_pmu, cpu, target);
396 }
397 }
398 return 0;
399}
400
401static int cstate_cpu_init(unsigned int cpu)
402{
403 unsigned int target;
404
405
406
407
408
409 target = cpumask_any_and(&cstate_core_cpu_mask,
410 topology_sibling_cpumask(cpu));
411
412 if (has_cstate_core && target >= nr_cpu_ids)
413 cpumask_set_cpu(cpu, &cstate_core_cpu_mask);
414
415
416
417
418
419 target = cpumask_any_and(&cstate_pkg_cpu_mask,
420 topology_core_cpumask(cpu));
421 if (has_cstate_pkg && target >= nr_cpu_ids)
422 cpumask_set_cpu(cpu, &cstate_pkg_cpu_mask);
423
424 return 0;
425}
426
427static struct pmu cstate_core_pmu = {
428 .attr_groups = core_attr_groups,
429 .name = "cstate_core",
430 .task_ctx_nr = perf_invalid_context,
431 .event_init = cstate_pmu_event_init,
432 .add = cstate_pmu_event_add,
433 .del = cstate_pmu_event_del,
434 .start = cstate_pmu_event_start,
435 .stop = cstate_pmu_event_stop,
436 .read = cstate_pmu_event_update,
437 .capabilities = PERF_PMU_CAP_NO_INTERRUPT,
438 .module = THIS_MODULE,
439};
440
441static struct pmu cstate_pkg_pmu = {
442 .attr_groups = pkg_attr_groups,
443 .name = "cstate_pkg",
444 .task_ctx_nr = perf_invalid_context,
445 .event_init = cstate_pmu_event_init,
446 .add = cstate_pmu_event_add,
447 .del = cstate_pmu_event_del,
448 .start = cstate_pmu_event_start,
449 .stop = cstate_pmu_event_stop,
450 .read = cstate_pmu_event_update,
451 .capabilities = PERF_PMU_CAP_NO_INTERRUPT,
452 .module = THIS_MODULE,
453};
454
455static const struct cstate_model nhm_cstates __initconst = {
456 .core_events = BIT(PERF_CSTATE_CORE_C3_RES) |
457 BIT(PERF_CSTATE_CORE_C6_RES),
458
459 .pkg_events = BIT(PERF_CSTATE_PKG_C3_RES) |
460 BIT(PERF_CSTATE_PKG_C6_RES) |
461 BIT(PERF_CSTATE_PKG_C7_RES),
462};
463
464static const struct cstate_model snb_cstates __initconst = {
465 .core_events = BIT(PERF_CSTATE_CORE_C3_RES) |
466 BIT(PERF_CSTATE_CORE_C6_RES) |
467 BIT(PERF_CSTATE_CORE_C7_RES),
468
469 .pkg_events = BIT(PERF_CSTATE_PKG_C2_RES) |
470 BIT(PERF_CSTATE_PKG_C3_RES) |
471 BIT(PERF_CSTATE_PKG_C6_RES) |
472 BIT(PERF_CSTATE_PKG_C7_RES),
473};
474
475static const struct cstate_model hswult_cstates __initconst = {
476 .core_events = BIT(PERF_CSTATE_CORE_C3_RES) |
477 BIT(PERF_CSTATE_CORE_C6_RES) |
478 BIT(PERF_CSTATE_CORE_C7_RES),
479
480 .pkg_events = BIT(PERF_CSTATE_PKG_C2_RES) |
481 BIT(PERF_CSTATE_PKG_C3_RES) |
482 BIT(PERF_CSTATE_PKG_C6_RES) |
483 BIT(PERF_CSTATE_PKG_C7_RES) |
484 BIT(PERF_CSTATE_PKG_C8_RES) |
485 BIT(PERF_CSTATE_PKG_C9_RES) |
486 BIT(PERF_CSTATE_PKG_C10_RES),
487};
488
489static const struct cstate_model slm_cstates __initconst = {
490 .core_events = BIT(PERF_CSTATE_CORE_C1_RES) |
491 BIT(PERF_CSTATE_CORE_C6_RES),
492
493 .pkg_events = BIT(PERF_CSTATE_PKG_C6_RES),
494 .quirks = SLM_PKG_C6_USE_C7_MSR,
495};
496
497
498static const struct cstate_model knl_cstates __initconst = {
499 .core_events = BIT(PERF_CSTATE_CORE_C6_RES),
500
501 .pkg_events = BIT(PERF_CSTATE_PKG_C2_RES) |
502 BIT(PERF_CSTATE_PKG_C3_RES) |
503 BIT(PERF_CSTATE_PKG_C6_RES),
504 .quirks = KNL_CORE_C6_MSR,
505};
506
507
508static const struct cstate_model glm_cstates __initconst = {
509 .core_events = BIT(PERF_CSTATE_CORE_C1_RES) |
510 BIT(PERF_CSTATE_CORE_C3_RES) |
511 BIT(PERF_CSTATE_CORE_C6_RES),
512
513 .pkg_events = BIT(PERF_CSTATE_PKG_C2_RES) |
514 BIT(PERF_CSTATE_PKG_C3_RES) |
515 BIT(PERF_CSTATE_PKG_C6_RES) |
516 BIT(PERF_CSTATE_PKG_C10_RES),
517};
518
519
520#define X86_CSTATES_MODEL(model, states) \
521 { X86_VENDOR_INTEL, 6, model, X86_FEATURE_ANY, (unsigned long) &(states) }
522
523static const struct x86_cpu_id intel_cstates_match[] __initconst = {
524 X86_CSTATES_MODEL(INTEL_FAM6_NEHALEM, nhm_cstates),
525 X86_CSTATES_MODEL(INTEL_FAM6_NEHALEM_EP, nhm_cstates),
526 X86_CSTATES_MODEL(INTEL_FAM6_NEHALEM_EX, nhm_cstates),
527
528 X86_CSTATES_MODEL(INTEL_FAM6_WESTMERE, nhm_cstates),
529 X86_CSTATES_MODEL(INTEL_FAM6_WESTMERE_EP, nhm_cstates),
530 X86_CSTATES_MODEL(INTEL_FAM6_WESTMERE_EX, nhm_cstates),
531
532 X86_CSTATES_MODEL(INTEL_FAM6_SANDYBRIDGE, snb_cstates),
533 X86_CSTATES_MODEL(INTEL_FAM6_SANDYBRIDGE_X, snb_cstates),
534
535 X86_CSTATES_MODEL(INTEL_FAM6_IVYBRIDGE, snb_cstates),
536 X86_CSTATES_MODEL(INTEL_FAM6_IVYBRIDGE_X, snb_cstates),
537
538 X86_CSTATES_MODEL(INTEL_FAM6_HASWELL_CORE, snb_cstates),
539 X86_CSTATES_MODEL(INTEL_FAM6_HASWELL_X, snb_cstates),
540 X86_CSTATES_MODEL(INTEL_FAM6_HASWELL_GT3E, snb_cstates),
541
542 X86_CSTATES_MODEL(INTEL_FAM6_HASWELL_ULT, hswult_cstates),
543
544 X86_CSTATES_MODEL(INTEL_FAM6_ATOM_SILVERMONT1, slm_cstates),
545 X86_CSTATES_MODEL(INTEL_FAM6_ATOM_SILVERMONT2, slm_cstates),
546 X86_CSTATES_MODEL(INTEL_FAM6_ATOM_AIRMONT, slm_cstates),
547
548 X86_CSTATES_MODEL(INTEL_FAM6_BROADWELL_CORE, snb_cstates),
549 X86_CSTATES_MODEL(INTEL_FAM6_BROADWELL_XEON_D, snb_cstates),
550 X86_CSTATES_MODEL(INTEL_FAM6_BROADWELL_GT3E, snb_cstates),
551 X86_CSTATES_MODEL(INTEL_FAM6_BROADWELL_X, snb_cstates),
552
553 X86_CSTATES_MODEL(INTEL_FAM6_SKYLAKE_MOBILE, snb_cstates),
554 X86_CSTATES_MODEL(INTEL_FAM6_SKYLAKE_DESKTOP, snb_cstates),
555 X86_CSTATES_MODEL(INTEL_FAM6_SKYLAKE_X, snb_cstates),
556
557 X86_CSTATES_MODEL(INTEL_FAM6_KABYLAKE_MOBILE, snb_cstates),
558 X86_CSTATES_MODEL(INTEL_FAM6_KABYLAKE_DESKTOP, snb_cstates),
559
560 X86_CSTATES_MODEL(INTEL_FAM6_XEON_PHI_KNL, knl_cstates),
561 X86_CSTATES_MODEL(INTEL_FAM6_XEON_PHI_KNM, knl_cstates),
562
563 X86_CSTATES_MODEL(INTEL_FAM6_ATOM_GOLDMONT, glm_cstates),
564 X86_CSTATES_MODEL(INTEL_FAM6_ATOM_DENVERTON, glm_cstates),
565
566 X86_CSTATES_MODEL(INTEL_FAM6_ATOM_GEMINI_LAKE, glm_cstates),
567 { },
568};
569MODULE_DEVICE_TABLE(x86cpu, intel_cstates_match);
570
571
572
573
574
575static bool __init cstate_probe_msr(const unsigned long evmsk, int max,
576 struct perf_cstate_msr *msr,
577 struct attribute **attrs)
578{
579 bool found = false;
580 unsigned int bit;
581 u64 val;
582
583 for (bit = 0; bit < max; bit++) {
584 if (test_bit(bit, &evmsk) && !rdmsrl_safe(msr[bit].msr, &val)) {
585 *attrs++ = &msr[bit].attr->attr.attr;
586 found = true;
587 } else {
588 msr[bit].attr = NULL;
589 }
590 }
591 *attrs = NULL;
592
593 return found;
594}
595
596static int __init cstate_probe(const struct cstate_model *cm)
597{
598
599 if (cm->quirks & SLM_PKG_C6_USE_C7_MSR)
600 pkg_msr[PERF_CSTATE_PKG_C6_RES].msr = MSR_PKG_C7_RESIDENCY;
601
602
603 if (cm->quirks & KNL_CORE_C6_MSR)
604 pkg_msr[PERF_CSTATE_CORE_C6_RES].msr = MSR_KNL_CORE_C6_RESIDENCY;
605
606
607 has_cstate_core = cstate_probe_msr(cm->core_events,
608 PERF_CSTATE_CORE_EVENT_MAX,
609 core_msr, core_events_attrs);
610
611 has_cstate_pkg = cstate_probe_msr(cm->pkg_events,
612 PERF_CSTATE_PKG_EVENT_MAX,
613 pkg_msr, pkg_events_attrs);
614
615 return (has_cstate_core || has_cstate_pkg) ? 0 : -ENODEV;
616}
617
618static inline void cstate_cleanup(void)
619{
620 cpuhp_remove_state_nocalls(CPUHP_AP_PERF_X86_CSTATE_ONLINE);
621 cpuhp_remove_state_nocalls(CPUHP_AP_PERF_X86_CSTATE_STARTING);
622
623 if (has_cstate_core)
624 perf_pmu_unregister(&cstate_core_pmu);
625
626 if (has_cstate_pkg)
627 perf_pmu_unregister(&cstate_pkg_pmu);
628}
629
630static int __init cstate_init(void)
631{
632 int err;
633
634 cpuhp_setup_state(CPUHP_AP_PERF_X86_CSTATE_STARTING,
635 "perf/x86/cstate:starting", cstate_cpu_init, NULL);
636 cpuhp_setup_state(CPUHP_AP_PERF_X86_CSTATE_ONLINE,
637 "perf/x86/cstate:online", NULL, cstate_cpu_exit);
638
639 if (has_cstate_core) {
640 err = perf_pmu_register(&cstate_core_pmu, cstate_core_pmu.name, -1);
641 if (err) {
642 has_cstate_core = false;
643 pr_info("Failed to register cstate core pmu\n");
644 cstate_cleanup();
645 return err;
646 }
647 }
648
649 if (has_cstate_pkg) {
650 err = perf_pmu_register(&cstate_pkg_pmu, cstate_pkg_pmu.name, -1);
651 if (err) {
652 has_cstate_pkg = false;
653 pr_info("Failed to register cstate pkg pmu\n");
654 cstate_cleanup();
655 return err;
656 }
657 }
658 return 0;
659}
660
661static int __init cstate_pmu_init(void)
662{
663 const struct x86_cpu_id *id;
664 int err;
665
666 if (boot_cpu_has(X86_FEATURE_HYPERVISOR))
667 return -ENODEV;
668
669 id = x86_match_cpu(intel_cstates_match);
670 if (!id)
671 return -ENODEV;
672
673 err = cstate_probe((const struct cstate_model *) id->driver_data);
674 if (err)
675 return err;
676
677 return cstate_init();
678}
679module_init(cstate_pmu_init);
680
681static void __exit cstate_pmu_exit(void)
682{
683 cstate_cleanup();
684}
685module_exit(cstate_pmu_exit);
686