Commit | Line | Data |
---|---|---|
241771ef | 1 | /* |
cdd6c482 | 2 | * Performance events x86 architecture code |
241771ef | 3 | * |
98144511 IM |
4 | * Copyright (C) 2008 Thomas Gleixner <tglx@linutronix.de> |
5 | * Copyright (C) 2008-2009 Red Hat, Inc., Ingo Molnar | |
6 | * Copyright (C) 2009 Jaswinder Singh Rajput | |
7 | * Copyright (C) 2009 Advanced Micro Devices, Inc., Robert Richter | |
90eec103 | 8 | * Copyright (C) 2008-2009 Red Hat, Inc., Peter Zijlstra |
30dd568c | 9 | * Copyright (C) 2009 Intel Corporation, <markus.t.metzger@intel.com> |
1da53e02 | 10 | * Copyright (C) 2009 Google, Inc., Stephane Eranian |
241771ef IM |
11 | * |
12 | * For licencing details see kernel-base/COPYING | |
13 | */ | |
14 | ||
cdd6c482 | 15 | #include <linux/perf_event.h> |
241771ef IM |
16 | #include <linux/capability.h> |
17 | #include <linux/notifier.h> | |
18 | #include <linux/hardirq.h> | |
19 | #include <linux/kprobes.h> | |
eb008eb6 PG |
20 | #include <linux/export.h> |
21 | #include <linux/init.h> | |
241771ef | 22 | #include <linux/kdebug.h> |
589ee628 | 23 | #include <linux/sched/mm.h> |
e6017571 | 24 | #include <linux/sched/clock.h> |
d7d59fb3 | 25 | #include <linux/uaccess.h> |
5a0e3ad6 | 26 | #include <linux/slab.h> |
30dd568c | 27 | #include <linux/cpu.h> |
272d30be | 28 | #include <linux/bitops.h> |
0c9d42ed | 29 | #include <linux/device.h> |
241771ef | 30 | |
241771ef | 31 | #include <asm/apic.h> |
d7d59fb3 | 32 | #include <asm/stacktrace.h> |
4e935e47 | 33 | #include <asm/nmi.h> |
69092624 | 34 | #include <asm/smp.h> |
c8e5910e | 35 | #include <asm/alternative.h> |
7911d3f7 | 36 | #include <asm/mmu_context.h> |
375074cc | 37 | #include <asm/tlbflush.h> |
e3f3541c | 38 | #include <asm/timer.h> |
d07bdfd3 PZ |
39 | #include <asm/desc.h> |
40 | #include <asm/ldt.h> | |
35f4d9b3 | 41 | #include <asm/unwind.h> |
241771ef | 42 | |
27f6d22b | 43 | #include "perf_event.h" |
de0428a7 | 44 | |
de0428a7 | 45 | struct x86_pmu x86_pmu __read_mostly; |
efc9f05d | 46 | |
de0428a7 | 47 | DEFINE_PER_CPU(struct cpu_hw_events, cpu_hw_events) = { |
b0f3f28e PZ |
48 | .enabled = 1, |
49 | }; | |
241771ef | 50 | |
a6673429 AL |
51 | struct static_key rdpmc_always_available = STATIC_KEY_INIT_FALSE; |
52 | ||
de0428a7 | 53 | u64 __read_mostly hw_cache_event_ids |
8326f44d IM |
54 | [PERF_COUNT_HW_CACHE_MAX] |
55 | [PERF_COUNT_HW_CACHE_OP_MAX] | |
56 | [PERF_COUNT_HW_CACHE_RESULT_MAX]; | |
de0428a7 | 57 | u64 __read_mostly hw_cache_extra_regs |
e994d7d2 AK |
58 | [PERF_COUNT_HW_CACHE_MAX] |
59 | [PERF_COUNT_HW_CACHE_OP_MAX] | |
60 | [PERF_COUNT_HW_CACHE_RESULT_MAX]; | |
8326f44d | 61 | |
ee06094f | 62 | /* |
cdd6c482 IM |
63 | * Propagate event elapsed time into the generic event. |
64 | * Can only be executed on the CPU where the event is active. | |
ee06094f IM |
65 | * Returns the delta events processed. |
66 | */ | |
de0428a7 | 67 | u64 x86_perf_event_update(struct perf_event *event) |
ee06094f | 68 | { |
cc2ad4ba | 69 | struct hw_perf_event *hwc = &event->hw; |
948b1bb8 | 70 | int shift = 64 - x86_pmu.cntval_bits; |
ec3232bd | 71 | u64 prev_raw_count, new_raw_count; |
cc2ad4ba | 72 | int idx = hwc->idx; |
7f612a7f | 73 | u64 delta; |
ee06094f | 74 | |
15c7ad51 | 75 | if (idx == INTEL_PMC_IDX_FIXED_BTS) |
30dd568c MM |
76 | return 0; |
77 | ||
ee06094f | 78 | /* |
cdd6c482 | 79 | * Careful: an NMI might modify the previous event value. |
ee06094f IM |
80 | * |
81 | * Our tactic to handle this is to first atomically read and | |
82 | * exchange a new raw count - then add that new-prev delta | |
cdd6c482 | 83 | * count to the generic event atomically: |
ee06094f IM |
84 | */ |
85 | again: | |
e7850595 | 86 | prev_raw_count = local64_read(&hwc->prev_count); |
c48b6053 | 87 | rdpmcl(hwc->event_base_rdpmc, new_raw_count); |
ee06094f | 88 | |
e7850595 | 89 | if (local64_cmpxchg(&hwc->prev_count, prev_raw_count, |
ee06094f IM |
90 | new_raw_count) != prev_raw_count) |
91 | goto again; | |
92 | ||
93 | /* | |
94 | * Now we have the new raw value and have updated the prev | |
95 | * timestamp already. We can now calculate the elapsed delta | |
cdd6c482 | 96 | * (event-)time and add that to the generic event. |
ee06094f IM |
97 | * |
98 | * Careful, not all hw sign-extends above the physical width | |
ec3232bd | 99 | * of the count. |
ee06094f | 100 | */ |
ec3232bd PZ |
101 | delta = (new_raw_count << shift) - (prev_raw_count << shift); |
102 | delta >>= shift; | |
ee06094f | 103 | |
e7850595 PZ |
104 | local64_add(delta, &event->count); |
105 | local64_sub(delta, &hwc->period_left); | |
4b7bfd0d RR |
106 | |
107 | return new_raw_count; | |
ee06094f IM |
108 | } |
109 | ||
a7e3ed1e AK |
110 | /* |
111 | * Find and validate any extra registers to set up. | |
112 | */ | |
113 | static int x86_pmu_extra_regs(u64 config, struct perf_event *event) | |
114 | { | |
efc9f05d | 115 | struct hw_perf_event_extra *reg; |
a7e3ed1e AK |
116 | struct extra_reg *er; |
117 | ||
efc9f05d | 118 | reg = &event->hw.extra_reg; |
a7e3ed1e AK |
119 | |
120 | if (!x86_pmu.extra_regs) | |
121 | return 0; | |
122 | ||
123 | for (er = x86_pmu.extra_regs; er->msr; er++) { | |
124 | if (er->event != (config & er->config_mask)) | |
125 | continue; | |
126 | if (event->attr.config1 & ~er->valid_mask) | |
127 | return -EINVAL; | |
338b522c KL |
128 | /* Check if the extra msrs can be safely accessed*/ |
129 | if (!er->extra_msr_access) | |
130 | return -ENXIO; | |
efc9f05d SE |
131 | |
132 | reg->idx = er->idx; | |
133 | reg->config = event->attr.config1; | |
134 | reg->reg = er->msr; | |
a7e3ed1e AK |
135 | break; |
136 | } | |
137 | return 0; | |
138 | } | |
139 | ||
cdd6c482 | 140 | static atomic_t active_events; |
1b7b938f | 141 | static atomic_t pmc_refcount; |
4e935e47 PZ |
142 | static DEFINE_MUTEX(pmc_reserve_mutex); |
143 | ||
b27ea29c RR |
144 | #ifdef CONFIG_X86_LOCAL_APIC |
145 | ||
4e935e47 PZ |
146 | static bool reserve_pmc_hardware(void) |
147 | { | |
148 | int i; | |
149 | ||
948b1bb8 | 150 | for (i = 0; i < x86_pmu.num_counters; i++) { |
41bf4989 | 151 | if (!reserve_perfctr_nmi(x86_pmu_event_addr(i))) |
4e935e47 PZ |
152 | goto perfctr_fail; |
153 | } | |
154 | ||
948b1bb8 | 155 | for (i = 0; i < x86_pmu.num_counters; i++) { |
41bf4989 | 156 | if (!reserve_evntsel_nmi(x86_pmu_config_addr(i))) |
4e935e47 PZ |
157 | goto eventsel_fail; |
158 | } | |
159 | ||
160 | return true; | |
161 | ||
162 | eventsel_fail: | |
163 | for (i--; i >= 0; i--) | |
41bf4989 | 164 | release_evntsel_nmi(x86_pmu_config_addr(i)); |
4e935e47 | 165 | |
948b1bb8 | 166 | i = x86_pmu.num_counters; |
4e935e47 PZ |
167 | |
168 | perfctr_fail: | |
169 | for (i--; i >= 0; i--) | |
41bf4989 | 170 | release_perfctr_nmi(x86_pmu_event_addr(i)); |
4e935e47 | 171 | |
4e935e47 PZ |
172 | return false; |
173 | } | |
174 | ||
175 | static void release_pmc_hardware(void) | |
176 | { | |
177 | int i; | |
178 | ||
948b1bb8 | 179 | for (i = 0; i < x86_pmu.num_counters; i++) { |
41bf4989 RR |
180 | release_perfctr_nmi(x86_pmu_event_addr(i)); |
181 | release_evntsel_nmi(x86_pmu_config_addr(i)); | |
4e935e47 | 182 | } |
4e935e47 PZ |
183 | } |
184 | ||
b27ea29c RR |
185 | #else |
186 | ||
187 | static bool reserve_pmc_hardware(void) { return true; } | |
188 | static void release_pmc_hardware(void) {} | |
189 | ||
190 | #endif | |
191 | ||
33c6d6a7 DZ |
192 | static bool check_hw_exists(void) |
193 | { | |
11d8b058 AB |
194 | u64 val, val_fail = -1, val_new= ~0; |
195 | int i, reg, reg_fail = -1, ret = 0; | |
a5ebe0ba | 196 | int bios_fail = 0; |
68ab7476 | 197 | int reg_safe = -1; |
33c6d6a7 | 198 | |
4407204c PZ |
199 | /* |
200 | * Check to see if the BIOS enabled any of the counters, if so | |
201 | * complain and bail. | |
202 | */ | |
203 | for (i = 0; i < x86_pmu.num_counters; i++) { | |
41bf4989 | 204 | reg = x86_pmu_config_addr(i); |
4407204c PZ |
205 | ret = rdmsrl_safe(reg, &val); |
206 | if (ret) | |
207 | goto msr_fail; | |
a5ebe0ba GD |
208 | if (val & ARCH_PERFMON_EVENTSEL_ENABLE) { |
209 | bios_fail = 1; | |
210 | val_fail = val; | |
211 | reg_fail = reg; | |
68ab7476 DZ |
212 | } else { |
213 | reg_safe = i; | |
a5ebe0ba | 214 | } |
4407204c PZ |
215 | } |
216 | ||
217 | if (x86_pmu.num_counters_fixed) { | |
218 | reg = MSR_ARCH_PERFMON_FIXED_CTR_CTRL; | |
219 | ret = rdmsrl_safe(reg, &val); | |
220 | if (ret) | |
221 | goto msr_fail; | |
222 | for (i = 0; i < x86_pmu.num_counters_fixed; i++) { | |
a5ebe0ba GD |
223 | if (val & (0x03 << i*4)) { |
224 | bios_fail = 1; | |
225 | val_fail = val; | |
226 | reg_fail = reg; | |
227 | } | |
4407204c PZ |
228 | } |
229 | } | |
230 | ||
68ab7476 DZ |
231 | /* |
232 | * If all the counters are enabled, the below test will always | |
233 | * fail. The tools will also become useless in this scenario. | |
234 | * Just fail and disable the hardware counters. | |
235 | */ | |
236 | ||
237 | if (reg_safe == -1) { | |
238 | reg = reg_safe; | |
239 | goto msr_fail; | |
240 | } | |
241 | ||
4407204c | 242 | /* |
bffd5fc2 AP |
243 | * Read the current value, change it and read it back to see if it |
244 | * matches, this is needed to detect certain hardware emulators | |
245 | * (qemu/kvm) that don't trap on the MSR access and always return 0s. | |
4407204c | 246 | */ |
68ab7476 | 247 | reg = x86_pmu_event_addr(reg_safe); |
bffd5fc2 AP |
248 | if (rdmsrl_safe(reg, &val)) |
249 | goto msr_fail; | |
250 | val ^= 0xffffUL; | |
f285f92f RR |
251 | ret = wrmsrl_safe(reg, val); |
252 | ret |= rdmsrl_safe(reg, &val_new); | |
33c6d6a7 | 253 | if (ret || val != val_new) |
4407204c | 254 | goto msr_fail; |
33c6d6a7 | 255 | |
45daae57 IM |
256 | /* |
257 | * We still allow the PMU driver to operate: | |
258 | */ | |
a5ebe0ba | 259 | if (bios_fail) { |
1b74dde7 CY |
260 | pr_cont("Broken BIOS detected, complain to your hardware vendor.\n"); |
261 | pr_err(FW_BUG "the BIOS has corrupted hw-PMU resources (MSR %x is %Lx)\n", | |
262 | reg_fail, val_fail); | |
a5ebe0ba | 263 | } |
45daae57 IM |
264 | |
265 | return true; | |
4407204c PZ |
266 | |
267 | msr_fail: | |
005bd007 JG |
268 | if (boot_cpu_has(X86_FEATURE_HYPERVISOR)) { |
269 | pr_cont("PMU not available due to virtualization, using software events only.\n"); | |
270 | } else { | |
271 | pr_cont("Broken PMU hardware detected, using software events only.\n"); | |
272 | pr_err("Failed to access perfctr msr (MSR %x is %Lx)\n", | |
273 | reg, val_new); | |
274 | } | |
45daae57 | 275 | |
4407204c | 276 | return false; |
33c6d6a7 DZ |
277 | } |
278 | ||
cdd6c482 | 279 | static void hw_perf_event_destroy(struct perf_event *event) |
4e935e47 | 280 | { |
6b099d9b | 281 | x86_release_hardware(); |
1b7b938f | 282 | atomic_dec(&active_events); |
4e935e47 PZ |
283 | } |
284 | ||
48070342 AS |
285 | void hw_perf_lbr_event_destroy(struct perf_event *event) |
286 | { | |
287 | hw_perf_event_destroy(event); | |
288 | ||
289 | /* undo the lbr/bts event accounting */ | |
290 | x86_del_exclusive(x86_lbr_exclusive_lbr); | |
291 | } | |
292 | ||
85cf9dba RR |
293 | static inline int x86_pmu_initialized(void) |
294 | { | |
295 | return x86_pmu.handle_irq != NULL; | |
296 | } | |
297 | ||
8326f44d | 298 | static inline int |
e994d7d2 | 299 | set_ext_hw_attr(struct hw_perf_event *hwc, struct perf_event *event) |
8326f44d | 300 | { |
e994d7d2 | 301 | struct perf_event_attr *attr = &event->attr; |
8326f44d IM |
302 | unsigned int cache_type, cache_op, cache_result; |
303 | u64 config, val; | |
304 | ||
305 | config = attr->config; | |
306 | ||
307 | cache_type = (config >> 0) & 0xff; | |
308 | if (cache_type >= PERF_COUNT_HW_CACHE_MAX) | |
309 | return -EINVAL; | |
310 | ||
311 | cache_op = (config >> 8) & 0xff; | |
312 | if (cache_op >= PERF_COUNT_HW_CACHE_OP_MAX) | |
313 | return -EINVAL; | |
314 | ||
315 | cache_result = (config >> 16) & 0xff; | |
316 | if (cache_result >= PERF_COUNT_HW_CACHE_RESULT_MAX) | |
317 | return -EINVAL; | |
318 | ||
319 | val = hw_cache_event_ids[cache_type][cache_op][cache_result]; | |
320 | ||
321 | if (val == 0) | |
322 | return -ENOENT; | |
323 | ||
324 | if (val == -1) | |
325 | return -EINVAL; | |
326 | ||
327 | hwc->config |= val; | |
e994d7d2 AK |
328 | attr->config1 = hw_cache_extra_regs[cache_type][cache_op][cache_result]; |
329 | return x86_pmu_extra_regs(val, event); | |
8326f44d IM |
330 | } |
331 | ||
6b099d9b AS |
332 | int x86_reserve_hardware(void) |
333 | { | |
334 | int err = 0; | |
335 | ||
1b7b938f | 336 | if (!atomic_inc_not_zero(&pmc_refcount)) { |
6b099d9b | 337 | mutex_lock(&pmc_reserve_mutex); |
1b7b938f | 338 | if (atomic_read(&pmc_refcount) == 0) { |
6b099d9b AS |
339 | if (!reserve_pmc_hardware()) |
340 | err = -EBUSY; | |
341 | else | |
342 | reserve_ds_buffers(); | |
343 | } | |
344 | if (!err) | |
1b7b938f | 345 | atomic_inc(&pmc_refcount); |
6b099d9b AS |
346 | mutex_unlock(&pmc_reserve_mutex); |
347 | } | |
348 | ||
349 | return err; | |
350 | } | |
351 | ||
352 | void x86_release_hardware(void) | |
353 | { | |
1b7b938f | 354 | if (atomic_dec_and_mutex_lock(&pmc_refcount, &pmc_reserve_mutex)) { |
6b099d9b AS |
355 | release_pmc_hardware(); |
356 | release_ds_buffers(); | |
357 | mutex_unlock(&pmc_reserve_mutex); | |
358 | } | |
359 | } | |
360 | ||
48070342 AS |
361 | /* |
362 | * Check if we can create event of a certain type (that no conflicting events | |
363 | * are present). | |
364 | */ | |
365 | int x86_add_exclusive(unsigned int what) | |
366 | { | |
93472aff | 367 | int i; |
48070342 | 368 | |
b0c1ef52 AK |
369 | /* |
370 | * When lbr_pt_coexist we allow PT to coexist with either LBR or BTS. | |
371 | * LBR and BTS are still mutually exclusive. | |
372 | */ | |
373 | if (x86_pmu.lbr_pt_coexist && what == x86_lbr_exclusive_pt) | |
ccbebba4 AS |
374 | return 0; |
375 | ||
93472aff PZ |
376 | if (!atomic_inc_not_zero(&x86_pmu.lbr_exclusive[what])) { |
377 | mutex_lock(&pmc_reserve_mutex); | |
378 | for (i = 0; i < ARRAY_SIZE(x86_pmu.lbr_exclusive); i++) { | |
379 | if (i != what && atomic_read(&x86_pmu.lbr_exclusive[i])) | |
380 | goto fail_unlock; | |
381 | } | |
382 | atomic_inc(&x86_pmu.lbr_exclusive[what]); | |
383 | mutex_unlock(&pmc_reserve_mutex); | |
6b099d9b | 384 | } |
48070342 | 385 | |
93472aff PZ |
386 | atomic_inc(&active_events); |
387 | return 0; | |
48070342 | 388 | |
93472aff | 389 | fail_unlock: |
48070342 | 390 | mutex_unlock(&pmc_reserve_mutex); |
93472aff | 391 | return -EBUSY; |
48070342 AS |
392 | } |
393 | ||
394 | void x86_del_exclusive(unsigned int what) | |
395 | { | |
b0c1ef52 | 396 | if (x86_pmu.lbr_pt_coexist && what == x86_lbr_exclusive_pt) |
ccbebba4 AS |
397 | return; |
398 | ||
48070342 | 399 | atomic_dec(&x86_pmu.lbr_exclusive[what]); |
1b7b938f | 400 | atomic_dec(&active_events); |
48070342 AS |
401 | } |
402 | ||
de0428a7 | 403 | int x86_setup_perfctr(struct perf_event *event) |
c1726f34 RR |
404 | { |
405 | struct perf_event_attr *attr = &event->attr; | |
406 | struct hw_perf_event *hwc = &event->hw; | |
407 | u64 config; | |
408 | ||
6c7e550f | 409 | if (!is_sampling_event(event)) { |
c1726f34 RR |
410 | hwc->sample_period = x86_pmu.max_period; |
411 | hwc->last_period = hwc->sample_period; | |
e7850595 | 412 | local64_set(&hwc->period_left, hwc->sample_period); |
c1726f34 RR |
413 | } |
414 | ||
415 | if (attr->type == PERF_TYPE_RAW) | |
ed13ec58 | 416 | return x86_pmu_extra_regs(event->attr.config, event); |
c1726f34 RR |
417 | |
418 | if (attr->type == PERF_TYPE_HW_CACHE) | |
e994d7d2 | 419 | return set_ext_hw_attr(hwc, event); |
c1726f34 RR |
420 | |
421 | if (attr->config >= x86_pmu.max_events) | |
422 | return -EINVAL; | |
423 | ||
424 | /* | |
425 | * The generic map: | |
426 | */ | |
427 | config = x86_pmu.event_map(attr->config); | |
428 | ||
429 | if (config == 0) | |
430 | return -ENOENT; | |
431 | ||
432 | if (config == -1LL) | |
433 | return -EINVAL; | |
434 | ||
435 | /* | |
436 | * Branch tracing: | |
437 | */ | |
18a073a3 PZ |
438 | if (attr->config == PERF_COUNT_HW_BRANCH_INSTRUCTIONS && |
439 | !attr->freq && hwc->sample_period == 1) { | |
c1726f34 | 440 | /* BTS is not supported by this architecture. */ |
6809b6ea | 441 | if (!x86_pmu.bts_active) |
c1726f34 RR |
442 | return -EOPNOTSUPP; |
443 | ||
444 | /* BTS is currently only allowed for user-mode. */ | |
445 | if (!attr->exclude_kernel) | |
446 | return -EOPNOTSUPP; | |
48070342 AS |
447 | |
448 | /* disallow bts if conflicting events are present */ | |
449 | if (x86_add_exclusive(x86_lbr_exclusive_lbr)) | |
450 | return -EBUSY; | |
451 | ||
452 | event->destroy = hw_perf_lbr_event_destroy; | |
c1726f34 RR |
453 | } |
454 | ||
455 | hwc->config |= config; | |
456 | ||
457 | return 0; | |
458 | } | |
4261e0e0 | 459 | |
ff3fb511 SE |
460 | /* |
461 | * check that branch_sample_type is compatible with | |
462 | * settings needed for precise_ip > 1 which implies | |
463 | * using the LBR to capture ALL taken branches at the | |
464 | * priv levels of the measurement | |
465 | */ | |
466 | static inline int precise_br_compat(struct perf_event *event) | |
467 | { | |
468 | u64 m = event->attr.branch_sample_type; | |
469 | u64 b = 0; | |
470 | ||
471 | /* must capture all branches */ | |
472 | if (!(m & PERF_SAMPLE_BRANCH_ANY)) | |
473 | return 0; | |
474 | ||
475 | m &= PERF_SAMPLE_BRANCH_KERNEL | PERF_SAMPLE_BRANCH_USER; | |
476 | ||
477 | if (!event->attr.exclude_user) | |
478 | b |= PERF_SAMPLE_BRANCH_USER; | |
479 | ||
480 | if (!event->attr.exclude_kernel) | |
481 | b |= PERF_SAMPLE_BRANCH_KERNEL; | |
482 | ||
483 | /* | |
484 | * ignore PERF_SAMPLE_BRANCH_HV, not supported on x86 | |
485 | */ | |
486 | ||
487 | return m == b; | |
488 | } | |
489 | ||
b00233b5 | 490 | int x86_pmu_max_precise(void) |
a072738e | 491 | { |
b00233b5 AK |
492 | int precise = 0; |
493 | ||
494 | /* Support for constant skid */ | |
495 | if (x86_pmu.pebs_active && !x86_pmu.pebs_broken) { | |
496 | precise++; | |
ab608344 | 497 | |
b00233b5 AK |
498 | /* Support for IP fixup */ |
499 | if (x86_pmu.lbr_nr || x86_pmu.intel_cap.pebs_format >= 2) | |
ab608344 PZ |
500 | precise++; |
501 | ||
b00233b5 AK |
502 | if (x86_pmu.pebs_prec_dist) |
503 | precise++; | |
504 | } | |
505 | return precise; | |
506 | } | |
72469764 | 507 | |
b00233b5 AK |
508 | int x86_pmu_hw_config(struct perf_event *event) |
509 | { | |
510 | if (event->attr.precise_ip) { | |
511 | int precise = x86_pmu_max_precise(); | |
ab608344 PZ |
512 | |
513 | if (event->attr.precise_ip > precise) | |
514 | return -EOPNOTSUPP; | |
18e7a45a JO |
515 | |
516 | /* There's no sense in having PEBS for non sampling events: */ | |
517 | if (!is_sampling_event(event)) | |
518 | return -EINVAL; | |
4b854900 YZ |
519 | } |
520 | /* | |
521 | * check that PEBS LBR correction does not conflict with | |
522 | * whatever the user is asking with attr->branch_sample_type | |
523 | */ | |
524 | if (event->attr.precise_ip > 1 && x86_pmu.intel_cap.pebs_format < 2) { | |
525 | u64 *br_type = &event->attr.branch_sample_type; | |
526 | ||
527 | if (has_branch_stack(event)) { | |
528 | if (!precise_br_compat(event)) | |
529 | return -EOPNOTSUPP; | |
530 | ||
531 | /* branch_sample_type is compatible */ | |
532 | ||
533 | } else { | |
534 | /* | |
535 | * user did not specify branch_sample_type | |
536 | * | |
537 | * For PEBS fixups, we capture all | |
538 | * the branches at the priv level of the | |
539 | * event. | |
540 | */ | |
541 | *br_type = PERF_SAMPLE_BRANCH_ANY; | |
542 | ||
543 | if (!event->attr.exclude_user) | |
544 | *br_type |= PERF_SAMPLE_BRANCH_USER; | |
545 | ||
546 | if (!event->attr.exclude_kernel) | |
547 | *br_type |= PERF_SAMPLE_BRANCH_KERNEL; | |
ff3fb511 | 548 | } |
ab608344 PZ |
549 | } |
550 | ||
e18bf526 YZ |
551 | if (event->attr.branch_sample_type & PERF_SAMPLE_BRANCH_CALL_STACK) |
552 | event->attach_state |= PERF_ATTACH_TASK_DATA; | |
553 | ||
a072738e CG |
554 | /* |
555 | * Generate PMC IRQs: | |
556 | * (keep 'enabled' bit clear for now) | |
557 | */ | |
b4cdc5c2 | 558 | event->hw.config = ARCH_PERFMON_EVENTSEL_INT; |
a072738e CG |
559 | |
560 | /* | |
561 | * Count user and OS events unless requested not to | |
562 | */ | |
b4cdc5c2 PZ |
563 | if (!event->attr.exclude_user) |
564 | event->hw.config |= ARCH_PERFMON_EVENTSEL_USR; | |
565 | if (!event->attr.exclude_kernel) | |
566 | event->hw.config |= ARCH_PERFMON_EVENTSEL_OS; | |
a072738e | 567 | |
b4cdc5c2 PZ |
568 | if (event->attr.type == PERF_TYPE_RAW) |
569 | event->hw.config |= event->attr.config & X86_RAW_EVENT_MASK; | |
a072738e | 570 | |
294fe0f5 AK |
571 | if (event->attr.sample_period && x86_pmu.limit_period) { |
572 | if (x86_pmu.limit_period(event, event->attr.sample_period) > | |
573 | event->attr.sample_period) | |
574 | return -EINVAL; | |
575 | } | |
576 | ||
9d0fcba6 | 577 | return x86_setup_perfctr(event); |
a098f448 RR |
578 | } |
579 | ||
241771ef | 580 | /* |
0d48696f | 581 | * Setup the hardware configuration for a given attr_type |
241771ef | 582 | */ |
b0a873eb | 583 | static int __x86_pmu_event_init(struct perf_event *event) |
241771ef | 584 | { |
4e935e47 | 585 | int err; |
241771ef | 586 | |
85cf9dba RR |
587 | if (!x86_pmu_initialized()) |
588 | return -ENODEV; | |
241771ef | 589 | |
6b099d9b | 590 | err = x86_reserve_hardware(); |
4e935e47 PZ |
591 | if (err) |
592 | return err; | |
593 | ||
1b7b938f | 594 | atomic_inc(&active_events); |
cdd6c482 | 595 | event->destroy = hw_perf_event_destroy; |
a1792cda | 596 | |
4261e0e0 RR |
597 | event->hw.idx = -1; |
598 | event->hw.last_cpu = -1; | |
599 | event->hw.last_tag = ~0ULL; | |
b690081d | 600 | |
efc9f05d SE |
601 | /* mark unused */ |
602 | event->hw.extra_reg.idx = EXTRA_REG_NONE; | |
b36817e8 SE |
603 | event->hw.branch_reg.idx = EXTRA_REG_NONE; |
604 | ||
9d0fcba6 | 605 | return x86_pmu.hw_config(event); |
4261e0e0 RR |
606 | } |
607 | ||
de0428a7 | 608 | void x86_pmu_disable_all(void) |
f87ad35d | 609 | { |
89cbc767 | 610 | struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events); |
9e35ad38 PZ |
611 | int idx; |
612 | ||
948b1bb8 | 613 | for (idx = 0; idx < x86_pmu.num_counters; idx++) { |
b0f3f28e PZ |
614 | u64 val; |
615 | ||
43f6201a | 616 | if (!test_bit(idx, cpuc->active_mask)) |
4295ee62 | 617 | continue; |
41bf4989 | 618 | rdmsrl(x86_pmu_config_addr(idx), val); |
bb1165d6 | 619 | if (!(val & ARCH_PERFMON_EVENTSEL_ENABLE)) |
4295ee62 | 620 | continue; |
bb1165d6 | 621 | val &= ~ARCH_PERFMON_EVENTSEL_ENABLE; |
41bf4989 | 622 | wrmsrl(x86_pmu_config_addr(idx), val); |
f87ad35d | 623 | } |
f87ad35d JSR |
624 | } |
625 | ||
c3d266c8 KL |
626 | /* |
627 | * There may be PMI landing after enabled=0. The PMI hitting could be before or | |
628 | * after disable_all. | |
629 | * | |
630 | * If PMI hits before disable_all, the PMU will be disabled in the NMI handler. | |
631 | * It will not be re-enabled in the NMI handler again, because enabled=0. After | |
632 | * handling the NMI, disable_all will be called, which will not change the | |
633 | * state either. If PMI hits after disable_all, the PMU is already disabled | |
634 | * before entering NMI handler. The NMI handler will not change the state | |
635 | * either. | |
636 | * | |
637 | * So either situation is harmless. | |
638 | */ | |
a4eaf7f1 | 639 | static void x86_pmu_disable(struct pmu *pmu) |
b56a3802 | 640 | { |
89cbc767 | 641 | struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events); |
1da53e02 | 642 | |
85cf9dba | 643 | if (!x86_pmu_initialized()) |
9e35ad38 | 644 | return; |
1da53e02 | 645 | |
1a6e21f7 PZ |
646 | if (!cpuc->enabled) |
647 | return; | |
648 | ||
649 | cpuc->n_added = 0; | |
650 | cpuc->enabled = 0; | |
651 | barrier(); | |
1da53e02 SE |
652 | |
653 | x86_pmu.disable_all(); | |
b56a3802 | 654 | } |
241771ef | 655 | |
de0428a7 | 656 | void x86_pmu_enable_all(int added) |
f87ad35d | 657 | { |
89cbc767 | 658 | struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events); |
f87ad35d JSR |
659 | int idx; |
660 | ||
948b1bb8 | 661 | for (idx = 0; idx < x86_pmu.num_counters; idx++) { |
d45dd923 | 662 | struct hw_perf_event *hwc = &cpuc->events[idx]->hw; |
b0f3f28e | 663 | |
43f6201a | 664 | if (!test_bit(idx, cpuc->active_mask)) |
4295ee62 | 665 | continue; |
984b838c | 666 | |
d45dd923 | 667 | __x86_pmu_enable_event(hwc, ARCH_PERFMON_EVENTSEL_ENABLE); |
f87ad35d JSR |
668 | } |
669 | } | |
670 | ||
51b0fe39 | 671 | static struct pmu pmu; |
1da53e02 SE |
672 | |
673 | static inline int is_x86_event(struct perf_event *event) | |
674 | { | |
675 | return event->pmu == &pmu; | |
676 | } | |
677 | ||
1e2ad28f RR |
678 | /* |
679 | * Event scheduler state: | |
680 | * | |
681 | * Assign events iterating over all events and counters, beginning | |
682 | * with events with least weights first. Keep the current iterator | |
683 | * state in struct sched_state. | |
684 | */ | |
685 | struct sched_state { | |
686 | int weight; | |
687 | int event; /* event index */ | |
688 | int counter; /* counter index */ | |
689 | int unassigned; /* number of events to be assigned left */ | |
cc1790cf | 690 | int nr_gp; /* number of GP counters used */ |
1e2ad28f RR |
691 | unsigned long used[BITS_TO_LONGS(X86_PMC_IDX_MAX)]; |
692 | }; | |
693 | ||
bc1738f6 RR |
694 | /* Total max is X86_PMC_IDX_MAX, but we are O(n!) limited */ |
695 | #define SCHED_STATES_MAX 2 | |
696 | ||
1e2ad28f RR |
697 | struct perf_sched { |
698 | int max_weight; | |
699 | int max_events; | |
cc1790cf PZ |
700 | int max_gp; |
701 | int saved_states; | |
b371b594 | 702 | struct event_constraint **constraints; |
1e2ad28f | 703 | struct sched_state state; |
bc1738f6 | 704 | struct sched_state saved[SCHED_STATES_MAX]; |
1e2ad28f RR |
705 | }; |
706 | ||
707 | /* | |
708 | * Initialize interator that runs through all events and counters. | |
709 | */ | |
b371b594 | 710 | static void perf_sched_init(struct perf_sched *sched, struct event_constraint **constraints, |
cc1790cf | 711 | int num, int wmin, int wmax, int gpmax) |
1e2ad28f RR |
712 | { |
713 | int idx; | |
714 | ||
715 | memset(sched, 0, sizeof(*sched)); | |
716 | sched->max_events = num; | |
717 | sched->max_weight = wmax; | |
cc1790cf | 718 | sched->max_gp = gpmax; |
b371b594 | 719 | sched->constraints = constraints; |
1e2ad28f RR |
720 | |
721 | for (idx = 0; idx < num; idx++) { | |
b371b594 | 722 | if (constraints[idx]->weight == wmin) |
1e2ad28f RR |
723 | break; |
724 | } | |
725 | ||
726 | sched->state.event = idx; /* start with min weight */ | |
727 | sched->state.weight = wmin; | |
728 | sched->state.unassigned = num; | |
729 | } | |
730 | ||
bc1738f6 RR |
731 | static void perf_sched_save_state(struct perf_sched *sched) |
732 | { | |
733 | if (WARN_ON_ONCE(sched->saved_states >= SCHED_STATES_MAX)) | |
734 | return; | |
735 | ||
736 | sched->saved[sched->saved_states] = sched->state; | |
737 | sched->saved_states++; | |
738 | } | |
739 | ||
740 | static bool perf_sched_restore_state(struct perf_sched *sched) | |
741 | { | |
742 | if (!sched->saved_states) | |
743 | return false; | |
744 | ||
745 | sched->saved_states--; | |
746 | sched->state = sched->saved[sched->saved_states]; | |
747 | ||
748 | /* continue with next counter: */ | |
749 | clear_bit(sched->state.counter++, sched->state.used); | |
750 | ||
751 | return true; | |
752 | } | |
753 | ||
1e2ad28f RR |
754 | /* |
755 | * Select a counter for the current event to schedule. Return true on | |
756 | * success. | |
757 | */ | |
bc1738f6 | 758 | static bool __perf_sched_find_counter(struct perf_sched *sched) |
1e2ad28f RR |
759 | { |
760 | struct event_constraint *c; | |
761 | int idx; | |
762 | ||
763 | if (!sched->state.unassigned) | |
764 | return false; | |
765 | ||
766 | if (sched->state.event >= sched->max_events) | |
767 | return false; | |
768 | ||
b371b594 | 769 | c = sched->constraints[sched->state.event]; |
4defea85 | 770 | /* Prefer fixed purpose counters */ |
15c7ad51 RR |
771 | if (c->idxmsk64 & (~0ULL << INTEL_PMC_IDX_FIXED)) { |
772 | idx = INTEL_PMC_IDX_FIXED; | |
307b1cd7 | 773 | for_each_set_bit_from(idx, c->idxmsk, X86_PMC_IDX_MAX) { |
4defea85 PZ |
774 | if (!__test_and_set_bit(idx, sched->state.used)) |
775 | goto done; | |
776 | } | |
777 | } | |
cc1790cf | 778 | |
1e2ad28f RR |
779 | /* Grab the first unused counter starting with idx */ |
780 | idx = sched->state.counter; | |
15c7ad51 | 781 | for_each_set_bit_from(idx, c->idxmsk, INTEL_PMC_IDX_FIXED) { |
cc1790cf PZ |
782 | if (!__test_and_set_bit(idx, sched->state.used)) { |
783 | if (sched->state.nr_gp++ >= sched->max_gp) | |
784 | return false; | |
785 | ||
4defea85 | 786 | goto done; |
cc1790cf | 787 | } |
1e2ad28f | 788 | } |
1e2ad28f | 789 | |
4defea85 PZ |
790 | return false; |
791 | ||
792 | done: | |
793 | sched->state.counter = idx; | |
1e2ad28f | 794 | |
bc1738f6 RR |
795 | if (c->overlap) |
796 | perf_sched_save_state(sched); | |
797 | ||
798 | return true; | |
799 | } | |
800 | ||
801 | static bool perf_sched_find_counter(struct perf_sched *sched) | |
802 | { | |
803 | while (!__perf_sched_find_counter(sched)) { | |
804 | if (!perf_sched_restore_state(sched)) | |
805 | return false; | |
806 | } | |
807 | ||
1e2ad28f RR |
808 | return true; |
809 | } | |
810 | ||
811 | /* | |
812 | * Go through all unassigned events and find the next one to schedule. | |
813 | * Take events with the least weight first. Return true on success. | |
814 | */ | |
815 | static bool perf_sched_next_event(struct perf_sched *sched) | |
816 | { | |
817 | struct event_constraint *c; | |
818 | ||
819 | if (!sched->state.unassigned || !--sched->state.unassigned) | |
820 | return false; | |
821 | ||
822 | do { | |
823 | /* next event */ | |
824 | sched->state.event++; | |
825 | if (sched->state.event >= sched->max_events) { | |
826 | /* next weight */ | |
827 | sched->state.event = 0; | |
828 | sched->state.weight++; | |
829 | if (sched->state.weight > sched->max_weight) | |
830 | return false; | |
831 | } | |
b371b594 | 832 | c = sched->constraints[sched->state.event]; |
1e2ad28f RR |
833 | } while (c->weight != sched->state.weight); |
834 | ||
835 | sched->state.counter = 0; /* start with first counter */ | |
836 | ||
837 | return true; | |
838 | } | |
839 | ||
840 | /* | |
841 | * Assign a counter for each event. | |
842 | */ | |
b371b594 | 843 | int perf_assign_events(struct event_constraint **constraints, int n, |
cc1790cf | 844 | int wmin, int wmax, int gpmax, int *assign) |
1e2ad28f RR |
845 | { |
846 | struct perf_sched sched; | |
847 | ||
cc1790cf | 848 | perf_sched_init(&sched, constraints, n, wmin, wmax, gpmax); |
1e2ad28f RR |
849 | |
850 | do { | |
851 | if (!perf_sched_find_counter(&sched)) | |
852 | break; /* failed */ | |
853 | if (assign) | |
854 | assign[sched.state.event] = sched.state.counter; | |
855 | } while (perf_sched_next_event(&sched)); | |
856 | ||
857 | return sched.state.unassigned; | |
858 | } | |
4a3dc121 | 859 | EXPORT_SYMBOL_GPL(perf_assign_events); |
1e2ad28f | 860 | |
de0428a7 | 861 | int x86_schedule_events(struct cpu_hw_events *cpuc, int n, int *assign) |
1da53e02 | 862 | { |
43b45780 | 863 | struct event_constraint *c; |
1da53e02 | 864 | unsigned long used_mask[BITS_TO_LONGS(X86_PMC_IDX_MAX)]; |
2f7f73a5 | 865 | struct perf_event *e; |
e979121b | 866 | int i, wmin, wmax, unsched = 0; |
1da53e02 SE |
867 | struct hw_perf_event *hwc; |
868 | ||
869 | bitmap_zero(used_mask, X86_PMC_IDX_MAX); | |
870 | ||
c5362c0c MD |
871 | if (x86_pmu.start_scheduling) |
872 | x86_pmu.start_scheduling(cpuc); | |
873 | ||
1e2ad28f | 874 | for (i = 0, wmin = X86_PMC_IDX_MAX, wmax = 0; i < n; i++) { |
b371b594 | 875 | cpuc->event_constraint[i] = NULL; |
79cba822 | 876 | c = x86_pmu.get_event_constraints(cpuc, i, cpuc->event_list[i]); |
b371b594 | 877 | cpuc->event_constraint[i] = c; |
43b45780 | 878 | |
1e2ad28f RR |
879 | wmin = min(wmin, c->weight); |
880 | wmax = max(wmax, c->weight); | |
1da53e02 SE |
881 | } |
882 | ||
8113070d SE |
883 | /* |
884 | * fastpath, try to reuse previous register | |
885 | */ | |
c933c1a6 | 886 | for (i = 0; i < n; i++) { |
8113070d | 887 | hwc = &cpuc->event_list[i]->hw; |
b371b594 | 888 | c = cpuc->event_constraint[i]; |
8113070d SE |
889 | |
890 | /* never assigned */ | |
891 | if (hwc->idx == -1) | |
892 | break; | |
893 | ||
894 | /* constraint still honored */ | |
63b14649 | 895 | if (!test_bit(hwc->idx, c->idxmsk)) |
8113070d SE |
896 | break; |
897 | ||
898 | /* not already used */ | |
899 | if (test_bit(hwc->idx, used_mask)) | |
900 | break; | |
901 | ||
34538ee7 | 902 | __set_bit(hwc->idx, used_mask); |
8113070d SE |
903 | if (assign) |
904 | assign[i] = hwc->idx; | |
905 | } | |
8113070d | 906 | |
1e2ad28f | 907 | /* slow path */ |
b371b594 | 908 | if (i != n) { |
cc1790cf PZ |
909 | int gpmax = x86_pmu.num_counters; |
910 | ||
911 | /* | |
912 | * Do not allow scheduling of more than half the available | |
913 | * generic counters. | |
914 | * | |
915 | * This helps avoid counter starvation of sibling thread by | |
916 | * ensuring at most half the counters cannot be in exclusive | |
917 | * mode. There is no designated counters for the limits. Any | |
918 | * N/2 counters can be used. This helps with events with | |
919 | * specific counter constraints. | |
920 | */ | |
921 | if (is_ht_workaround_enabled() && !cpuc->is_fake && | |
922 | READ_ONCE(cpuc->excl_cntrs->exclusive_present)) | |
923 | gpmax /= 2; | |
924 | ||
b371b594 | 925 | unsched = perf_assign_events(cpuc->event_constraint, n, wmin, |
cc1790cf | 926 | wmax, gpmax, assign); |
b371b594 | 927 | } |
8113070d | 928 | |
2f7f73a5 | 929 | /* |
e979121b MD |
930 | * In case of success (unsched = 0), mark events as committed, |
931 | * so we do not put_constraint() in case new events are added | |
932 | * and fail to be scheduled | |
933 | * | |
934 | * We invoke the lower level commit callback to lock the resource | |
935 | * | |
936 | * We do not need to do all of this in case we are called to | |
937 | * validate an event group (assign == NULL) | |
2f7f73a5 | 938 | */ |
e979121b | 939 | if (!unsched && assign) { |
2f7f73a5 SE |
940 | for (i = 0; i < n; i++) { |
941 | e = cpuc->event_list[i]; | |
942 | e->hw.flags |= PERF_X86_EVENT_COMMITTED; | |
c5362c0c | 943 | if (x86_pmu.commit_scheduling) |
b371b594 | 944 | x86_pmu.commit_scheduling(cpuc, i, assign[i]); |
2f7f73a5 | 945 | } |
8736e548 | 946 | } else { |
1da53e02 | 947 | for (i = 0; i < n; i++) { |
2f7f73a5 SE |
948 | e = cpuc->event_list[i]; |
949 | /* | |
950 | * do not put_constraint() on comitted events, | |
951 | * because they are good to go | |
952 | */ | |
953 | if ((e->hw.flags & PERF_X86_EVENT_COMMITTED)) | |
954 | continue; | |
955 | ||
e979121b MD |
956 | /* |
957 | * release events that failed scheduling | |
958 | */ | |
1da53e02 | 959 | if (x86_pmu.put_event_constraints) |
2f7f73a5 | 960 | x86_pmu.put_event_constraints(cpuc, e); |
1da53e02 SE |
961 | } |
962 | } | |
c5362c0c MD |
963 | |
964 | if (x86_pmu.stop_scheduling) | |
965 | x86_pmu.stop_scheduling(cpuc); | |
966 | ||
e979121b | 967 | return unsched ? -EINVAL : 0; |
1da53e02 SE |
968 | } |
969 | ||
970 | /* | |
971 | * dogrp: true if must collect siblings events (group) | |
972 | * returns total number of events and error code | |
973 | */ | |
974 | static int collect_events(struct cpu_hw_events *cpuc, struct perf_event *leader, bool dogrp) | |
975 | { | |
976 | struct perf_event *event; | |
977 | int n, max_count; | |
978 | ||
948b1bb8 | 979 | max_count = x86_pmu.num_counters + x86_pmu.num_counters_fixed; |
1da53e02 SE |
980 | |
981 | /* current number of events already accepted */ | |
982 | n = cpuc->n_events; | |
983 | ||
984 | if (is_x86_event(leader)) { | |
985 | if (n >= max_count) | |
aa2bc1ad | 986 | return -EINVAL; |
1da53e02 SE |
987 | cpuc->event_list[n] = leader; |
988 | n++; | |
989 | } | |
990 | if (!dogrp) | |
991 | return n; | |
992 | ||
993 | list_for_each_entry(event, &leader->sibling_list, group_entry) { | |
994 | if (!is_x86_event(event) || | |
8113070d | 995 | event->state <= PERF_EVENT_STATE_OFF) |
1da53e02 SE |
996 | continue; |
997 | ||
998 | if (n >= max_count) | |
aa2bc1ad | 999 | return -EINVAL; |
1da53e02 SE |
1000 | |
1001 | cpuc->event_list[n] = event; | |
1002 | n++; | |
1003 | } | |
1004 | return n; | |
1005 | } | |
1006 | ||
1da53e02 | 1007 | static inline void x86_assign_hw_event(struct perf_event *event, |
447a194b | 1008 | struct cpu_hw_events *cpuc, int i) |
1da53e02 | 1009 | { |
447a194b SE |
1010 | struct hw_perf_event *hwc = &event->hw; |
1011 | ||
1012 | hwc->idx = cpuc->assign[i]; | |
1013 | hwc->last_cpu = smp_processor_id(); | |
1014 | hwc->last_tag = ++cpuc->tags[i]; | |
1da53e02 | 1015 | |
15c7ad51 | 1016 | if (hwc->idx == INTEL_PMC_IDX_FIXED_BTS) { |
1da53e02 SE |
1017 | hwc->config_base = 0; |
1018 | hwc->event_base = 0; | |
15c7ad51 | 1019 | } else if (hwc->idx >= INTEL_PMC_IDX_FIXED) { |
1da53e02 | 1020 | hwc->config_base = MSR_ARCH_PERFMON_FIXED_CTR_CTRL; |
15c7ad51 RR |
1021 | hwc->event_base = MSR_ARCH_PERFMON_FIXED_CTR0 + (hwc->idx - INTEL_PMC_IDX_FIXED); |
1022 | hwc->event_base_rdpmc = (hwc->idx - INTEL_PMC_IDX_FIXED) | 1<<30; | |
1da53e02 | 1023 | } else { |
73d6e522 RR |
1024 | hwc->config_base = x86_pmu_config_addr(hwc->idx); |
1025 | hwc->event_base = x86_pmu_event_addr(hwc->idx); | |
0fbdad07 | 1026 | hwc->event_base_rdpmc = x86_pmu_rdpmc_index(hwc->idx); |
1da53e02 SE |
1027 | } |
1028 | } | |
1029 | ||
447a194b SE |
1030 | static inline int match_prev_assignment(struct hw_perf_event *hwc, |
1031 | struct cpu_hw_events *cpuc, | |
1032 | int i) | |
1033 | { | |
1034 | return hwc->idx == cpuc->assign[i] && | |
1035 | hwc->last_cpu == smp_processor_id() && | |
1036 | hwc->last_tag == cpuc->tags[i]; | |
1037 | } | |
1038 | ||
a4eaf7f1 | 1039 | static void x86_pmu_start(struct perf_event *event, int flags); |
2e841873 | 1040 | |
a4eaf7f1 | 1041 | static void x86_pmu_enable(struct pmu *pmu) |
ee06094f | 1042 | { |
89cbc767 | 1043 | struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events); |
1da53e02 SE |
1044 | struct perf_event *event; |
1045 | struct hw_perf_event *hwc; | |
11164cd4 | 1046 | int i, added = cpuc->n_added; |
1da53e02 | 1047 | |
85cf9dba | 1048 | if (!x86_pmu_initialized()) |
2b9ff0db | 1049 | return; |
1a6e21f7 PZ |
1050 | |
1051 | if (cpuc->enabled) | |
1052 | return; | |
1053 | ||
1da53e02 | 1054 | if (cpuc->n_added) { |
19925ce7 | 1055 | int n_running = cpuc->n_events - cpuc->n_added; |
1da53e02 SE |
1056 | /* |
1057 | * apply assignment obtained either from | |
1058 | * hw_perf_group_sched_in() or x86_pmu_enable() | |
1059 | * | |
1060 | * step1: save events moving to new counters | |
1da53e02 | 1061 | */ |
19925ce7 | 1062 | for (i = 0; i < n_running; i++) { |
1da53e02 SE |
1063 | event = cpuc->event_list[i]; |
1064 | hwc = &event->hw; | |
1065 | ||
447a194b SE |
1066 | /* |
1067 | * we can avoid reprogramming counter if: | |
1068 | * - assigned same counter as last time | |
1069 | * - running on same CPU as last time | |
1070 | * - no other event has used the counter since | |
1071 | */ | |
1072 | if (hwc->idx == -1 || | |
1073 | match_prev_assignment(hwc, cpuc, i)) | |
1da53e02 SE |
1074 | continue; |
1075 | ||
a4eaf7f1 PZ |
1076 | /* |
1077 | * Ensure we don't accidentally enable a stopped | |
1078 | * counter simply because we rescheduled. | |
1079 | */ | |
1080 | if (hwc->state & PERF_HES_STOPPED) | |
1081 | hwc->state |= PERF_HES_ARCH; | |
1082 | ||
1083 | x86_pmu_stop(event, PERF_EF_UPDATE); | |
1da53e02 SE |
1084 | } |
1085 | ||
c347a2f1 PZ |
1086 | /* |
1087 | * step2: reprogram moved events into new counters | |
1088 | */ | |
1da53e02 | 1089 | for (i = 0; i < cpuc->n_events; i++) { |
1da53e02 SE |
1090 | event = cpuc->event_list[i]; |
1091 | hwc = &event->hw; | |
1092 | ||
45e16a68 | 1093 | if (!match_prev_assignment(hwc, cpuc, i)) |
447a194b | 1094 | x86_assign_hw_event(event, cpuc, i); |
45e16a68 PZ |
1095 | else if (i < n_running) |
1096 | continue; | |
1da53e02 | 1097 | |
a4eaf7f1 PZ |
1098 | if (hwc->state & PERF_HES_ARCH) |
1099 | continue; | |
1100 | ||
1101 | x86_pmu_start(event, PERF_EF_RELOAD); | |
1da53e02 SE |
1102 | } |
1103 | cpuc->n_added = 0; | |
1104 | perf_events_lapic_init(); | |
1105 | } | |
1a6e21f7 PZ |
1106 | |
1107 | cpuc->enabled = 1; | |
1108 | barrier(); | |
1109 | ||
11164cd4 | 1110 | x86_pmu.enable_all(added); |
ee06094f | 1111 | } |
ee06094f | 1112 | |
245b2e70 | 1113 | static DEFINE_PER_CPU(u64 [X86_PMC_IDX_MAX], pmc_prev_left); |
241771ef | 1114 | |
ee06094f IM |
1115 | /* |
1116 | * Set the next IRQ period, based on the hwc->period_left value. | |
cdd6c482 | 1117 | * To be called with the event disabled in hw: |
ee06094f | 1118 | */ |
de0428a7 | 1119 | int x86_perf_event_set_period(struct perf_event *event) |
241771ef | 1120 | { |
07088edb | 1121 | struct hw_perf_event *hwc = &event->hw; |
e7850595 | 1122 | s64 left = local64_read(&hwc->period_left); |
e4abb5d4 | 1123 | s64 period = hwc->sample_period; |
7645a24c | 1124 | int ret = 0, idx = hwc->idx; |
ee06094f | 1125 | |
15c7ad51 | 1126 | if (idx == INTEL_PMC_IDX_FIXED_BTS) |
30dd568c MM |
1127 | return 0; |
1128 | ||
ee06094f | 1129 | /* |
af901ca1 | 1130 | * If we are way outside a reasonable range then just skip forward: |
ee06094f IM |
1131 | */ |
1132 | if (unlikely(left <= -period)) { | |
1133 | left = period; | |
e7850595 | 1134 | local64_set(&hwc->period_left, left); |
9e350de3 | 1135 | hwc->last_period = period; |
e4abb5d4 | 1136 | ret = 1; |
ee06094f IM |
1137 | } |
1138 | ||
1139 | if (unlikely(left <= 0)) { | |
1140 | left += period; | |
e7850595 | 1141 | local64_set(&hwc->period_left, left); |
9e350de3 | 1142 | hwc->last_period = period; |
e4abb5d4 | 1143 | ret = 1; |
ee06094f | 1144 | } |
1c80f4b5 | 1145 | /* |
dfc65094 | 1146 | * Quirk: certain CPUs dont like it if just 1 hw_event is left: |
1c80f4b5 IM |
1147 | */ |
1148 | if (unlikely(left < 2)) | |
1149 | left = 2; | |
241771ef | 1150 | |
e4abb5d4 PZ |
1151 | if (left > x86_pmu.max_period) |
1152 | left = x86_pmu.max_period; | |
1153 | ||
294fe0f5 AK |
1154 | if (x86_pmu.limit_period) |
1155 | left = x86_pmu.limit_period(event, left); | |
1156 | ||
245b2e70 | 1157 | per_cpu(pmc_prev_left[idx], smp_processor_id()) = left; |
ee06094f | 1158 | |
851559e3 YZ |
1159 | if (!(hwc->flags & PERF_X86_EVENT_AUTO_RELOAD) || |
1160 | local64_read(&hwc->prev_count) != (u64)-left) { | |
1161 | /* | |
1162 | * The hw event starts counting from this event offset, | |
1163 | * mark it to be able to extra future deltas: | |
1164 | */ | |
1165 | local64_set(&hwc->prev_count, (u64)-left); | |
ee06094f | 1166 | |
851559e3 YZ |
1167 | wrmsrl(hwc->event_base, (u64)(-left) & x86_pmu.cntval_mask); |
1168 | } | |
68aa00ac CG |
1169 | |
1170 | /* | |
1171 | * Due to erratum on certan cpu we need | |
1172 | * a second write to be sure the register | |
1173 | * is updated properly | |
1174 | */ | |
1175 | if (x86_pmu.perfctr_second_write) { | |
73d6e522 | 1176 | wrmsrl(hwc->event_base, |
948b1bb8 | 1177 | (u64)(-left) & x86_pmu.cntval_mask); |
68aa00ac | 1178 | } |
e4abb5d4 | 1179 | |
cdd6c482 | 1180 | perf_event_update_userpage(event); |
194002b2 | 1181 | |
e4abb5d4 | 1182 | return ret; |
2f18d1e8 IM |
1183 | } |
1184 | ||
de0428a7 | 1185 | void x86_pmu_enable_event(struct perf_event *event) |
7c90cc45 | 1186 | { |
0a3aee0d | 1187 | if (__this_cpu_read(cpu_hw_events.enabled)) |
31fa58af RR |
1188 | __x86_pmu_enable_event(&event->hw, |
1189 | ARCH_PERFMON_EVENTSEL_ENABLE); | |
241771ef IM |
1190 | } |
1191 | ||
b690081d | 1192 | /* |
a4eaf7f1 | 1193 | * Add a single event to the PMU. |
1da53e02 SE |
1194 | * |
1195 | * The event is added to the group of enabled events | |
1196 | * but only if it can be scehduled with existing events. | |
fe9081cc | 1197 | */ |
a4eaf7f1 | 1198 | static int x86_pmu_add(struct perf_event *event, int flags) |
fe9081cc | 1199 | { |
89cbc767 | 1200 | struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events); |
1da53e02 SE |
1201 | struct hw_perf_event *hwc; |
1202 | int assign[X86_PMC_IDX_MAX]; | |
1203 | int n, n0, ret; | |
fe9081cc | 1204 | |
1da53e02 | 1205 | hwc = &event->hw; |
fe9081cc | 1206 | |
1da53e02 | 1207 | n0 = cpuc->n_events; |
24cd7f54 PZ |
1208 | ret = n = collect_events(cpuc, event, false); |
1209 | if (ret < 0) | |
1210 | goto out; | |
53b441a5 | 1211 | |
a4eaf7f1 PZ |
1212 | hwc->state = PERF_HES_UPTODATE | PERF_HES_STOPPED; |
1213 | if (!(flags & PERF_EF_START)) | |
1214 | hwc->state |= PERF_HES_ARCH; | |
1215 | ||
4d1c52b0 LM |
1216 | /* |
1217 | * If group events scheduling transaction was started, | |
0d2eb44f | 1218 | * skip the schedulability test here, it will be performed |
c347a2f1 | 1219 | * at commit time (->commit_txn) as a whole. |
68f7082f PZ |
1220 | * |
1221 | * If commit fails, we'll call ->del() on all events | |
1222 | * for which ->add() was called. | |
4d1c52b0 | 1223 | */ |
8f3e5684 | 1224 | if (cpuc->txn_flags & PERF_PMU_TXN_ADD) |
24cd7f54 | 1225 | goto done_collect; |
4d1c52b0 | 1226 | |
a072738e | 1227 | ret = x86_pmu.schedule_events(cpuc, n, assign); |
1da53e02 | 1228 | if (ret) |
24cd7f54 | 1229 | goto out; |
1da53e02 SE |
1230 | /* |
1231 | * copy new assignment, now we know it is possible | |
1232 | * will be used by hw_perf_enable() | |
1233 | */ | |
1234 | memcpy(cpuc->assign, assign, n*sizeof(int)); | |
7e2ae347 | 1235 | |
24cd7f54 | 1236 | done_collect: |
c347a2f1 PZ |
1237 | /* |
1238 | * Commit the collect_events() state. See x86_pmu_del() and | |
1239 | * x86_pmu_*_txn(). | |
1240 | */ | |
1da53e02 | 1241 | cpuc->n_events = n; |
356e1f2e | 1242 | cpuc->n_added += n - n0; |
90151c35 | 1243 | cpuc->n_txn += n - n0; |
95cdd2e7 | 1244 | |
68f7082f PZ |
1245 | if (x86_pmu.add) { |
1246 | /* | |
1247 | * This is before x86_pmu_enable() will call x86_pmu_start(), | |
1248 | * so we enable LBRs before an event needs them etc.. | |
1249 | */ | |
1250 | x86_pmu.add(event); | |
1251 | } | |
1252 | ||
24cd7f54 PZ |
1253 | ret = 0; |
1254 | out: | |
24cd7f54 | 1255 | return ret; |
241771ef IM |
1256 | } |
1257 | ||
a4eaf7f1 | 1258 | static void x86_pmu_start(struct perf_event *event, int flags) |
d76a0812 | 1259 | { |
89cbc767 | 1260 | struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events); |
c08053e6 PZ |
1261 | int idx = event->hw.idx; |
1262 | ||
a4eaf7f1 PZ |
1263 | if (WARN_ON_ONCE(!(event->hw.state & PERF_HES_STOPPED))) |
1264 | return; | |
1265 | ||
1266 | if (WARN_ON_ONCE(idx == -1)) | |
1267 | return; | |
1268 | ||
1269 | if (flags & PERF_EF_RELOAD) { | |
1270 | WARN_ON_ONCE(!(event->hw.state & PERF_HES_UPTODATE)); | |
1271 | x86_perf_event_set_period(event); | |
1272 | } | |
1273 | ||
1274 | event->hw.state = 0; | |
d76a0812 | 1275 | |
c08053e6 PZ |
1276 | cpuc->events[idx] = event; |
1277 | __set_bit(idx, cpuc->active_mask); | |
63e6be6d | 1278 | __set_bit(idx, cpuc->running); |
aff3d91a | 1279 | x86_pmu.enable(event); |
c08053e6 | 1280 | perf_event_update_userpage(event); |
a78ac325 PZ |
1281 | } |
1282 | ||
cdd6c482 | 1283 | void perf_event_print_debug(void) |
241771ef | 1284 | { |
2f18d1e8 | 1285 | u64 ctrl, status, overflow, pmc_ctrl, pmc_count, prev_left, fixed; |
da3e606d | 1286 | u64 pebs, debugctl; |
cdd6c482 | 1287 | struct cpu_hw_events *cpuc; |
5bb9efe3 | 1288 | unsigned long flags; |
1e125676 IM |
1289 | int cpu, idx; |
1290 | ||
948b1bb8 | 1291 | if (!x86_pmu.num_counters) |
1e125676 | 1292 | return; |
241771ef | 1293 | |
5bb9efe3 | 1294 | local_irq_save(flags); |
241771ef IM |
1295 | |
1296 | cpu = smp_processor_id(); | |
cdd6c482 | 1297 | cpuc = &per_cpu(cpu_hw_events, cpu); |
241771ef | 1298 | |
faa28ae0 | 1299 | if (x86_pmu.version >= 2) { |
a1ef58f4 JSR |
1300 | rdmsrl(MSR_CORE_PERF_GLOBAL_CTRL, ctrl); |
1301 | rdmsrl(MSR_CORE_PERF_GLOBAL_STATUS, status); | |
1302 | rdmsrl(MSR_CORE_PERF_GLOBAL_OVF_CTRL, overflow); | |
1303 | rdmsrl(MSR_ARCH_PERFMON_FIXED_CTR_CTRL, fixed); | |
1304 | ||
1305 | pr_info("\n"); | |
1306 | pr_info("CPU#%d: ctrl: %016llx\n", cpu, ctrl); | |
1307 | pr_info("CPU#%d: status: %016llx\n", cpu, status); | |
1308 | pr_info("CPU#%d: overflow: %016llx\n", cpu, overflow); | |
1309 | pr_info("CPU#%d: fixed: %016llx\n", cpu, fixed); | |
15fde110 AK |
1310 | if (x86_pmu.pebs_constraints) { |
1311 | rdmsrl(MSR_IA32_PEBS_ENABLE, pebs); | |
1312 | pr_info("CPU#%d: pebs: %016llx\n", cpu, pebs); | |
1313 | } | |
da3e606d AK |
1314 | if (x86_pmu.lbr_nr) { |
1315 | rdmsrl(MSR_IA32_DEBUGCTLMSR, debugctl); | |
1316 | pr_info("CPU#%d: debugctl: %016llx\n", cpu, debugctl); | |
1317 | } | |
f87ad35d | 1318 | } |
7645a24c | 1319 | pr_info("CPU#%d: active: %016llx\n", cpu, *(u64 *)cpuc->active_mask); |
241771ef | 1320 | |
948b1bb8 | 1321 | for (idx = 0; idx < x86_pmu.num_counters; idx++) { |
41bf4989 RR |
1322 | rdmsrl(x86_pmu_config_addr(idx), pmc_ctrl); |
1323 | rdmsrl(x86_pmu_event_addr(idx), pmc_count); | |
241771ef | 1324 | |
245b2e70 | 1325 | prev_left = per_cpu(pmc_prev_left[idx], cpu); |
241771ef | 1326 | |
a1ef58f4 | 1327 | pr_info("CPU#%d: gen-PMC%d ctrl: %016llx\n", |
241771ef | 1328 | cpu, idx, pmc_ctrl); |
a1ef58f4 | 1329 | pr_info("CPU#%d: gen-PMC%d count: %016llx\n", |
241771ef | 1330 | cpu, idx, pmc_count); |
a1ef58f4 | 1331 | pr_info("CPU#%d: gen-PMC%d left: %016llx\n", |
ee06094f | 1332 | cpu, idx, prev_left); |
241771ef | 1333 | } |
948b1bb8 | 1334 | for (idx = 0; idx < x86_pmu.num_counters_fixed; idx++) { |
2f18d1e8 IM |
1335 | rdmsrl(MSR_ARCH_PERFMON_FIXED_CTR0 + idx, pmc_count); |
1336 | ||
a1ef58f4 | 1337 | pr_info("CPU#%d: fixed-PMC%d count: %016llx\n", |
2f18d1e8 IM |
1338 | cpu, idx, pmc_count); |
1339 | } | |
5bb9efe3 | 1340 | local_irq_restore(flags); |
241771ef IM |
1341 | } |
1342 | ||
de0428a7 | 1343 | void x86_pmu_stop(struct perf_event *event, int flags) |
241771ef | 1344 | { |
89cbc767 | 1345 | struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events); |
cdd6c482 | 1346 | struct hw_perf_event *hwc = &event->hw; |
241771ef | 1347 | |
a4eaf7f1 PZ |
1348 | if (__test_and_clear_bit(hwc->idx, cpuc->active_mask)) { |
1349 | x86_pmu.disable(event); | |
1350 | cpuc->events[hwc->idx] = NULL; | |
1351 | WARN_ON_ONCE(hwc->state & PERF_HES_STOPPED); | |
1352 | hwc->state |= PERF_HES_STOPPED; | |
1353 | } | |
30dd568c | 1354 | |
a4eaf7f1 PZ |
1355 | if ((flags & PERF_EF_UPDATE) && !(hwc->state & PERF_HES_UPTODATE)) { |
1356 | /* | |
1357 | * Drain the remaining delta count out of a event | |
1358 | * that we are disabling: | |
1359 | */ | |
1360 | x86_perf_event_update(event); | |
1361 | hwc->state |= PERF_HES_UPTODATE; | |
1362 | } | |
2e841873 PZ |
1363 | } |
1364 | ||
a4eaf7f1 | 1365 | static void x86_pmu_del(struct perf_event *event, int flags) |
2e841873 | 1366 | { |
89cbc767 | 1367 | struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events); |
2e841873 PZ |
1368 | int i; |
1369 | ||
2f7f73a5 SE |
1370 | /* |
1371 | * event is descheduled | |
1372 | */ | |
1373 | event->hw.flags &= ~PERF_X86_EVENT_COMMITTED; | |
1374 | ||
90151c35 | 1375 | /* |
68f7082f | 1376 | * If we're called during a txn, we only need to undo x86_pmu.add. |
90151c35 SE |
1377 | * The events never got scheduled and ->cancel_txn will truncate |
1378 | * the event_list. | |
c347a2f1 PZ |
1379 | * |
1380 | * XXX assumes any ->del() called during a TXN will only be on | |
1381 | * an event added during that same TXN. | |
90151c35 | 1382 | */ |
8f3e5684 | 1383 | if (cpuc->txn_flags & PERF_PMU_TXN_ADD) |
68f7082f | 1384 | goto do_del; |
90151c35 | 1385 | |
c347a2f1 PZ |
1386 | /* |
1387 | * Not a TXN, therefore cleanup properly. | |
1388 | */ | |
a4eaf7f1 | 1389 | x86_pmu_stop(event, PERF_EF_UPDATE); |
194002b2 | 1390 | |
1da53e02 | 1391 | for (i = 0; i < cpuc->n_events; i++) { |
c347a2f1 PZ |
1392 | if (event == cpuc->event_list[i]) |
1393 | break; | |
1394 | } | |
1da53e02 | 1395 | |
c347a2f1 PZ |
1396 | if (WARN_ON_ONCE(i == cpuc->n_events)) /* called ->del() without ->add() ? */ |
1397 | return; | |
26e61e89 | 1398 | |
c347a2f1 PZ |
1399 | /* If we have a newly added event; make sure to decrease n_added. */ |
1400 | if (i >= cpuc->n_events - cpuc->n_added) | |
1401 | --cpuc->n_added; | |
1da53e02 | 1402 | |
c347a2f1 PZ |
1403 | if (x86_pmu.put_event_constraints) |
1404 | x86_pmu.put_event_constraints(cpuc, event); | |
1405 | ||
1406 | /* Delete the array entry. */ | |
b371b594 | 1407 | while (++i < cpuc->n_events) { |
c347a2f1 | 1408 | cpuc->event_list[i-1] = cpuc->event_list[i]; |
b371b594 PZ |
1409 | cpuc->event_constraint[i-1] = cpuc->event_constraint[i]; |
1410 | } | |
c347a2f1 | 1411 | --cpuc->n_events; |
1da53e02 | 1412 | |
cdd6c482 | 1413 | perf_event_update_userpage(event); |
68f7082f PZ |
1414 | |
1415 | do_del: | |
1416 | if (x86_pmu.del) { | |
1417 | /* | |
1418 | * This is after x86_pmu_stop(); so we disable LBRs after any | |
1419 | * event can need them etc.. | |
1420 | */ | |
1421 | x86_pmu.del(event); | |
1422 | } | |
241771ef IM |
1423 | } |
1424 | ||
de0428a7 | 1425 | int x86_pmu_handle_irq(struct pt_regs *regs) |
a29aa8a7 | 1426 | { |
df1a132b | 1427 | struct perf_sample_data data; |
cdd6c482 IM |
1428 | struct cpu_hw_events *cpuc; |
1429 | struct perf_event *event; | |
11d1578f | 1430 | int idx, handled = 0; |
9029a5e3 IM |
1431 | u64 val; |
1432 | ||
89cbc767 | 1433 | cpuc = this_cpu_ptr(&cpu_hw_events); |
962bf7a6 | 1434 | |
2bce5dac DZ |
1435 | /* |
1436 | * Some chipsets need to unmask the LVTPC in a particular spot | |
1437 | * inside the nmi handler. As a result, the unmasking was pushed | |
1438 | * into all the nmi handlers. | |
1439 | * | |
1440 | * This generic handler doesn't seem to have any issues where the | |
1441 | * unmasking occurs so it was left at the top. | |
1442 | */ | |
1443 | apic_write(APIC_LVTPC, APIC_DM_NMI); | |
1444 | ||
948b1bb8 | 1445 | for (idx = 0; idx < x86_pmu.num_counters; idx++) { |
63e6be6d RR |
1446 | if (!test_bit(idx, cpuc->active_mask)) { |
1447 | /* | |
1448 | * Though we deactivated the counter some cpus | |
1449 | * might still deliver spurious interrupts still | |
1450 | * in flight. Catch them: | |
1451 | */ | |
1452 | if (__test_and_clear_bit(idx, cpuc->running)) | |
1453 | handled++; | |
a29aa8a7 | 1454 | continue; |
63e6be6d | 1455 | } |
962bf7a6 | 1456 | |
cdd6c482 | 1457 | event = cpuc->events[idx]; |
a4016a79 | 1458 | |
cc2ad4ba | 1459 | val = x86_perf_event_update(event); |
948b1bb8 | 1460 | if (val & (1ULL << (x86_pmu.cntval_bits - 1))) |
48e22d56 | 1461 | continue; |
962bf7a6 | 1462 | |
9e350de3 | 1463 | /* |
cdd6c482 | 1464 | * event overflow |
9e350de3 | 1465 | */ |
4177c42a | 1466 | handled++; |
fd0d000b | 1467 | perf_sample_data_init(&data, 0, event->hw.last_period); |
9e350de3 | 1468 | |
07088edb | 1469 | if (!x86_perf_event_set_period(event)) |
e4abb5d4 PZ |
1470 | continue; |
1471 | ||
a8b0ca17 | 1472 | if (perf_event_overflow(event, &data, regs)) |
a4eaf7f1 | 1473 | x86_pmu_stop(event, 0); |
a29aa8a7 | 1474 | } |
962bf7a6 | 1475 | |
9e350de3 PZ |
1476 | if (handled) |
1477 | inc_irq_stat(apic_perf_irqs); | |
1478 | ||
a29aa8a7 RR |
1479 | return handled; |
1480 | } | |
39d81eab | 1481 | |
cdd6c482 | 1482 | void perf_events_lapic_init(void) |
241771ef | 1483 | { |
04da8a43 | 1484 | if (!x86_pmu.apic || !x86_pmu_initialized()) |
241771ef | 1485 | return; |
85cf9dba | 1486 | |
241771ef | 1487 | /* |
c323d95f | 1488 | * Always use NMI for PMU |
241771ef | 1489 | */ |
c323d95f | 1490 | apic_write(APIC_LVTPC, APIC_DM_NMI); |
241771ef IM |
1491 | } |
1492 | ||
9326638c | 1493 | static int |
9c48f1c6 | 1494 | perf_event_nmi_handler(unsigned int cmd, struct pt_regs *regs) |
241771ef | 1495 | { |
14c63f17 DH |
1496 | u64 start_clock; |
1497 | u64 finish_clock; | |
e8a923cc | 1498 | int ret; |
14c63f17 | 1499 | |
1b7b938f AS |
1500 | /* |
1501 | * All PMUs/events that share this PMI handler should make sure to | |
1502 | * increment active_events for their events. | |
1503 | */ | |
cdd6c482 | 1504 | if (!atomic_read(&active_events)) |
9c48f1c6 | 1505 | return NMI_DONE; |
4177c42a | 1506 | |
e8a923cc | 1507 | start_clock = sched_clock(); |
14c63f17 | 1508 | ret = x86_pmu.handle_irq(regs); |
e8a923cc | 1509 | finish_clock = sched_clock(); |
14c63f17 DH |
1510 | |
1511 | perf_sample_event_took(finish_clock - start_clock); | |
1512 | ||
1513 | return ret; | |
241771ef | 1514 | } |
9326638c | 1515 | NOKPROBE_SYMBOL(perf_event_nmi_handler); |
241771ef | 1516 | |
de0428a7 KW |
1517 | struct event_constraint emptyconstraint; |
1518 | struct event_constraint unconstrained; | |
f87ad35d | 1519 | |
95ca792c | 1520 | static int x86_pmu_prepare_cpu(unsigned int cpu) |
3f6da390 | 1521 | { |
7fdba1ca | 1522 | struct cpu_hw_events *cpuc = &per_cpu(cpu_hw_events, cpu); |
95ca792c | 1523 | int i; |
3f6da390 | 1524 | |
95ca792c TG |
1525 | for (i = 0 ; i < X86_PERF_KFREE_MAX; i++) |
1526 | cpuc->kfree_on_online[i] = NULL; | |
1527 | if (x86_pmu.cpu_prepare) | |
1528 | return x86_pmu.cpu_prepare(cpu); | |
1529 | return 0; | |
1530 | } | |
7fdba1ca | 1531 | |
95ca792c TG |
1532 | static int x86_pmu_dead_cpu(unsigned int cpu) |
1533 | { | |
1534 | if (x86_pmu.cpu_dead) | |
1535 | x86_pmu.cpu_dead(cpu); | |
1536 | return 0; | |
1537 | } | |
3f6da390 | 1538 | |
95ca792c TG |
1539 | static int x86_pmu_online_cpu(unsigned int cpu) |
1540 | { | |
1541 | struct cpu_hw_events *cpuc = &per_cpu(cpu_hw_events, cpu); | |
1542 | int i; | |
3f6da390 | 1543 | |
95ca792c TG |
1544 | for (i = 0 ; i < X86_PERF_KFREE_MAX; i++) { |
1545 | kfree(cpuc->kfree_on_online[i]); | |
1546 | cpuc->kfree_on_online[i] = NULL; | |
3f6da390 | 1547 | } |
95ca792c TG |
1548 | return 0; |
1549 | } | |
3f6da390 | 1550 | |
95ca792c TG |
1551 | static int x86_pmu_starting_cpu(unsigned int cpu) |
1552 | { | |
1553 | if (x86_pmu.cpu_starting) | |
1554 | x86_pmu.cpu_starting(cpu); | |
1555 | return 0; | |
1556 | } | |
1557 | ||
1558 | static int x86_pmu_dying_cpu(unsigned int cpu) | |
1559 | { | |
1560 | if (x86_pmu.cpu_dying) | |
1561 | x86_pmu.cpu_dying(cpu); | |
1562 | return 0; | |
3f6da390 PZ |
1563 | } |
1564 | ||
12558038 CG |
1565 | static void __init pmu_check_apic(void) |
1566 | { | |
93984fbd | 1567 | if (boot_cpu_has(X86_FEATURE_APIC)) |
12558038 CG |
1568 | return; |
1569 | ||
1570 | x86_pmu.apic = 0; | |
1571 | pr_info("no APIC, boot with the \"lapic\" boot parameter to force-enable it.\n"); | |
1572 | pr_info("no hardware sampling interrupt available.\n"); | |
c184c980 VW |
1573 | |
1574 | /* | |
1575 | * If we have a PMU initialized but no APIC | |
1576 | * interrupts, we cannot sample hardware | |
1577 | * events (user-space has to fall back and | |
1578 | * sample via a hrtimer based software event): | |
1579 | */ | |
1580 | pmu.capabilities |= PERF_PMU_CAP_NO_INTERRUPT; | |
1581 | ||
12558038 CG |
1582 | } |
1583 | ||
641cc938 JO |
1584 | static struct attribute_group x86_pmu_format_group = { |
1585 | .name = "format", | |
1586 | .attrs = NULL, | |
1587 | }; | |
1588 | ||
8300daa2 JO |
1589 | /* |
1590 | * Remove all undefined events (x86_pmu.event_map(id) == 0) | |
1591 | * out of events_attr attributes. | |
1592 | */ | |
1593 | static void __init filter_events(struct attribute **attrs) | |
1594 | { | |
3a54aaa0 SE |
1595 | struct device_attribute *d; |
1596 | struct perf_pmu_events_attr *pmu_attr; | |
61b87cae | 1597 | int offset = 0; |
8300daa2 JO |
1598 | int i, j; |
1599 | ||
1600 | for (i = 0; attrs[i]; i++) { | |
3a54aaa0 SE |
1601 | d = (struct device_attribute *)attrs[i]; |
1602 | pmu_attr = container_of(d, struct perf_pmu_events_attr, attr); | |
1603 | /* str trumps id */ | |
1604 | if (pmu_attr->event_str) | |
1605 | continue; | |
61b87cae | 1606 | if (x86_pmu.event_map(i + offset)) |
8300daa2 JO |
1607 | continue; |
1608 | ||
1609 | for (j = i; attrs[j]; j++) | |
1610 | attrs[j] = attrs[j + 1]; | |
1611 | ||
1612 | /* Check the shifted attr. */ | |
1613 | i--; | |
61b87cae SE |
1614 | |
1615 | /* | |
1616 | * event_map() is index based, the attrs array is organized | |
1617 | * by increasing event index. If we shift the events, then | |
1618 | * we need to compensate for the event_map(), otherwise | |
1619 | * we are looking up the wrong event in the map | |
1620 | */ | |
1621 | offset++; | |
8300daa2 JO |
1622 | } |
1623 | } | |
1624 | ||
1a6461b1 | 1625 | /* Merge two pointer arrays */ |
47732d88 | 1626 | __init struct attribute **merge_attr(struct attribute **a, struct attribute **b) |
1a6461b1 AK |
1627 | { |
1628 | struct attribute **new; | |
1629 | int j, i; | |
1630 | ||
1631 | for (j = 0; a[j]; j++) | |
1632 | ; | |
1633 | for (i = 0; b[i]; i++) | |
1634 | j++; | |
1635 | j++; | |
1636 | ||
1637 | new = kmalloc(sizeof(struct attribute *) * j, GFP_KERNEL); | |
1638 | if (!new) | |
1639 | return NULL; | |
1640 | ||
1641 | j = 0; | |
1642 | for (i = 0; a[i]; i++) | |
1643 | new[j++] = a[i]; | |
1644 | for (i = 0; b[i]; i++) | |
1645 | new[j++] = b[i]; | |
1646 | new[j] = NULL; | |
1647 | ||
1648 | return new; | |
1649 | } | |
1650 | ||
c7ab62bf | 1651 | ssize_t events_sysfs_show(struct device *dev, struct device_attribute *attr, char *page) |
a4747393 JO |
1652 | { |
1653 | struct perf_pmu_events_attr *pmu_attr = \ | |
1654 | container_of(attr, struct perf_pmu_events_attr, attr); | |
a4747393 | 1655 | u64 config = x86_pmu.event_map(pmu_attr->id); |
a4747393 | 1656 | |
3a54aaa0 SE |
1657 | /* string trumps id */ |
1658 | if (pmu_attr->event_str) | |
1659 | return sprintf(page, "%s", pmu_attr->event_str); | |
a4747393 | 1660 | |
3a54aaa0 SE |
1661 | return x86_pmu.events_sysfs_show(page, config); |
1662 | } | |
c7ab62bf | 1663 | EXPORT_SYMBOL_GPL(events_sysfs_show); |
a4747393 | 1664 | |
fc07e9f9 AK |
1665 | ssize_t events_ht_sysfs_show(struct device *dev, struct device_attribute *attr, |
1666 | char *page) | |
1667 | { | |
1668 | struct perf_pmu_events_ht_attr *pmu_attr = | |
1669 | container_of(attr, struct perf_pmu_events_ht_attr, attr); | |
1670 | ||
1671 | /* | |
1672 | * Report conditional events depending on Hyper-Threading. | |
1673 | * | |
1674 | * This is overly conservative as usually the HT special | |
1675 | * handling is not needed if the other CPU thread is idle. | |
1676 | * | |
1677 | * Note this does not (and cannot) handle the case when thread | |
1678 | * siblings are invisible, for example with virtualization | |
1679 | * if they are owned by some other guest. The user tool | |
1680 | * has to re-read when a thread sibling gets onlined later. | |
1681 | */ | |
1682 | return sprintf(page, "%s", | |
1683 | topology_max_smt_threads() > 1 ? | |
1684 | pmu_attr->event_str_ht : | |
1685 | pmu_attr->event_str_noht); | |
1686 | } | |
1687 | ||
a4747393 JO |
1688 | EVENT_ATTR(cpu-cycles, CPU_CYCLES ); |
1689 | EVENT_ATTR(instructions, INSTRUCTIONS ); | |
1690 | EVENT_ATTR(cache-references, CACHE_REFERENCES ); | |
1691 | EVENT_ATTR(cache-misses, CACHE_MISSES ); | |
1692 | EVENT_ATTR(branch-instructions, BRANCH_INSTRUCTIONS ); | |
1693 | EVENT_ATTR(branch-misses, BRANCH_MISSES ); | |
1694 | EVENT_ATTR(bus-cycles, BUS_CYCLES ); | |
1695 | EVENT_ATTR(stalled-cycles-frontend, STALLED_CYCLES_FRONTEND ); | |
1696 | EVENT_ATTR(stalled-cycles-backend, STALLED_CYCLES_BACKEND ); | |
1697 | EVENT_ATTR(ref-cycles, REF_CPU_CYCLES ); | |
1698 | ||
1699 | static struct attribute *empty_attrs; | |
1700 | ||
95d18aa2 | 1701 | static struct attribute *events_attr[] = { |
a4747393 JO |
1702 | EVENT_PTR(CPU_CYCLES), |
1703 | EVENT_PTR(INSTRUCTIONS), | |
1704 | EVENT_PTR(CACHE_REFERENCES), | |
1705 | EVENT_PTR(CACHE_MISSES), | |
1706 | EVENT_PTR(BRANCH_INSTRUCTIONS), | |
1707 | EVENT_PTR(BRANCH_MISSES), | |
1708 | EVENT_PTR(BUS_CYCLES), | |
1709 | EVENT_PTR(STALLED_CYCLES_FRONTEND), | |
1710 | EVENT_PTR(STALLED_CYCLES_BACKEND), | |
1711 | EVENT_PTR(REF_CPU_CYCLES), | |
1712 | NULL, | |
1713 | }; | |
1714 | ||
1715 | static struct attribute_group x86_pmu_events_group = { | |
1716 | .name = "events", | |
1717 | .attrs = events_attr, | |
1718 | }; | |
1719 | ||
0bf79d44 | 1720 | ssize_t x86_event_sysfs_show(char *page, u64 config, u64 event) |
43c032fe | 1721 | { |
43c032fe JO |
1722 | u64 umask = (config & ARCH_PERFMON_EVENTSEL_UMASK) >> 8; |
1723 | u64 cmask = (config & ARCH_PERFMON_EVENTSEL_CMASK) >> 24; | |
1724 | bool edge = (config & ARCH_PERFMON_EVENTSEL_EDGE); | |
1725 | bool pc = (config & ARCH_PERFMON_EVENTSEL_PIN_CONTROL); | |
1726 | bool any = (config & ARCH_PERFMON_EVENTSEL_ANY); | |
1727 | bool inv = (config & ARCH_PERFMON_EVENTSEL_INV); | |
1728 | ssize_t ret; | |
1729 | ||
1730 | /* | |
1731 | * We have whole page size to spend and just little data | |
1732 | * to write, so we can safely use sprintf. | |
1733 | */ | |
1734 | ret = sprintf(page, "event=0x%02llx", event); | |
1735 | ||
1736 | if (umask) | |
1737 | ret += sprintf(page + ret, ",umask=0x%02llx", umask); | |
1738 | ||
1739 | if (edge) | |
1740 | ret += sprintf(page + ret, ",edge"); | |
1741 | ||
1742 | if (pc) | |
1743 | ret += sprintf(page + ret, ",pc"); | |
1744 | ||
1745 | if (any) | |
1746 | ret += sprintf(page + ret, ",any"); | |
1747 | ||
1748 | if (inv) | |
1749 | ret += sprintf(page + ret, ",inv"); | |
1750 | ||
1751 | if (cmask) | |
1752 | ret += sprintf(page + ret, ",cmask=0x%02llx", cmask); | |
1753 | ||
1754 | ret += sprintf(page + ret, "\n"); | |
1755 | ||
1756 | return ret; | |
1757 | } | |
1758 | ||
6089327f | 1759 | static struct attribute_group x86_pmu_attr_group; |
5da382eb | 1760 | static struct attribute_group x86_pmu_caps_group; |
6089327f | 1761 | |
dda99116 | 1762 | static int __init init_hw_perf_events(void) |
b56a3802 | 1763 | { |
c1d6f42f | 1764 | struct x86_pmu_quirk *quirk; |
72eae04d RR |
1765 | int err; |
1766 | ||
cdd6c482 | 1767 | pr_info("Performance Events: "); |
1123e3ad | 1768 | |
b56a3802 JSR |
1769 | switch (boot_cpu_data.x86_vendor) { |
1770 | case X86_VENDOR_INTEL: | |
72eae04d | 1771 | err = intel_pmu_init(); |
b56a3802 | 1772 | break; |
f87ad35d | 1773 | case X86_VENDOR_AMD: |
72eae04d | 1774 | err = amd_pmu_init(); |
f87ad35d | 1775 | break; |
4138960a | 1776 | default: |
8a3da6c7 | 1777 | err = -ENOTSUPP; |
b56a3802 | 1778 | } |
1123e3ad | 1779 | if (err != 0) { |
cdd6c482 | 1780 | pr_cont("no PMU driver, software events only.\n"); |
004417a6 | 1781 | return 0; |
1123e3ad | 1782 | } |
b56a3802 | 1783 | |
12558038 CG |
1784 | pmu_check_apic(); |
1785 | ||
33c6d6a7 | 1786 | /* sanity check that the hardware exists or is emulated */ |
4407204c | 1787 | if (!check_hw_exists()) |
004417a6 | 1788 | return 0; |
33c6d6a7 | 1789 | |
1123e3ad | 1790 | pr_cont("%s PMU driver.\n", x86_pmu.name); |
faa28ae0 | 1791 | |
e97df763 PZ |
1792 | x86_pmu.attr_rdpmc = 1; /* enable userspace RDPMC usage by default */ |
1793 | ||
c1d6f42f PZ |
1794 | for (quirk = x86_pmu.quirks; quirk; quirk = quirk->next) |
1795 | quirk->func(); | |
3c44780b | 1796 | |
a1eac7ac RR |
1797 | if (!x86_pmu.intel_ctrl) |
1798 | x86_pmu.intel_ctrl = (1 << x86_pmu.num_counters) - 1; | |
241771ef | 1799 | |
cdd6c482 | 1800 | perf_events_lapic_init(); |
9c48f1c6 | 1801 | register_nmi_handler(NMI_LOCAL, perf_event_nmi_handler, 0, "PMI"); |
1123e3ad | 1802 | |
63b14649 | 1803 | unconstrained = (struct event_constraint) |
948b1bb8 | 1804 | __EVENT_CONSTRAINT(0, (1ULL << x86_pmu.num_counters) - 1, |
9fac2cf3 | 1805 | 0, x86_pmu.num_counters, 0, 0); |
63b14649 | 1806 | |
641cc938 | 1807 | x86_pmu_format_group.attrs = x86_pmu.format_attrs; |
0c9d42ed | 1808 | |
5da382eb PZ |
1809 | if (x86_pmu.caps_attrs) { |
1810 | struct attribute **tmp; | |
1811 | ||
1812 | tmp = merge_attr(x86_pmu_caps_group.attrs, x86_pmu.caps_attrs); | |
1813 | if (!WARN_ON(!tmp)) | |
1814 | x86_pmu_caps_group.attrs = tmp; | |
1815 | } | |
0c9d42ed | 1816 | |
f20093ee SE |
1817 | if (x86_pmu.event_attrs) |
1818 | x86_pmu_events_group.attrs = x86_pmu.event_attrs; | |
1819 | ||
a4747393 JO |
1820 | if (!x86_pmu.events_sysfs_show) |
1821 | x86_pmu_events_group.attrs = &empty_attrs; | |
8300daa2 JO |
1822 | else |
1823 | filter_events(x86_pmu_events_group.attrs); | |
a4747393 | 1824 | |
1a6461b1 AK |
1825 | if (x86_pmu.cpu_events) { |
1826 | struct attribute **tmp; | |
1827 | ||
1828 | tmp = merge_attr(x86_pmu_events_group.attrs, x86_pmu.cpu_events); | |
1829 | if (!WARN_ON(!tmp)) | |
1830 | x86_pmu_events_group.attrs = tmp; | |
1831 | } | |
1832 | ||
6089327f KL |
1833 | if (x86_pmu.attrs) { |
1834 | struct attribute **tmp; | |
1835 | ||
1836 | tmp = merge_attr(x86_pmu_attr_group.attrs, x86_pmu.attrs); | |
1837 | if (!WARN_ON(!tmp)) | |
1838 | x86_pmu_attr_group.attrs = tmp; | |
1839 | } | |
1840 | ||
57c0c15b | 1841 | pr_info("... version: %d\n", x86_pmu.version); |
948b1bb8 RR |
1842 | pr_info("... bit width: %d\n", x86_pmu.cntval_bits); |
1843 | pr_info("... generic registers: %d\n", x86_pmu.num_counters); | |
1844 | pr_info("... value mask: %016Lx\n", x86_pmu.cntval_mask); | |
57c0c15b | 1845 | pr_info("... max period: %016Lx\n", x86_pmu.max_period); |
948b1bb8 | 1846 | pr_info("... fixed-purpose events: %d\n", x86_pmu.num_counters_fixed); |
d6dc0b4e | 1847 | pr_info("... event mask: %016Lx\n", x86_pmu.intel_ctrl); |
3f6da390 | 1848 | |
95ca792c TG |
1849 | /* |
1850 | * Install callbacks. Core will call them for each online | |
1851 | * cpu. | |
1852 | */ | |
73c1b41e | 1853 | err = cpuhp_setup_state(CPUHP_PERF_X86_PREPARE, "perf/x86:prepare", |
95ca792c TG |
1854 | x86_pmu_prepare_cpu, x86_pmu_dead_cpu); |
1855 | if (err) | |
1856 | return err; | |
1857 | ||
1858 | err = cpuhp_setup_state(CPUHP_AP_PERF_X86_STARTING, | |
73c1b41e | 1859 | "perf/x86:starting", x86_pmu_starting_cpu, |
95ca792c TG |
1860 | x86_pmu_dying_cpu); |
1861 | if (err) | |
1862 | goto out; | |
1863 | ||
73c1b41e | 1864 | err = cpuhp_setup_state(CPUHP_AP_PERF_X86_ONLINE, "perf/x86:online", |
95ca792c TG |
1865 | x86_pmu_online_cpu, NULL); |
1866 | if (err) | |
1867 | goto out1; | |
1868 | ||
1869 | err = perf_pmu_register(&pmu, "cpu", PERF_TYPE_RAW); | |
1870 | if (err) | |
1871 | goto out2; | |
004417a6 PZ |
1872 | |
1873 | return 0; | |
95ca792c TG |
1874 | |
1875 | out2: | |
1876 | cpuhp_remove_state(CPUHP_AP_PERF_X86_ONLINE); | |
1877 | out1: | |
1878 | cpuhp_remove_state(CPUHP_AP_PERF_X86_STARTING); | |
1879 | out: | |
1880 | cpuhp_remove_state(CPUHP_PERF_X86_PREPARE); | |
1881 | return err; | |
241771ef | 1882 | } |
004417a6 | 1883 | early_initcall(init_hw_perf_events); |
621a01ea | 1884 | |
cdd6c482 | 1885 | static inline void x86_pmu_read(struct perf_event *event) |
ee06094f | 1886 | { |
cc2ad4ba | 1887 | x86_perf_event_update(event); |
ee06094f IM |
1888 | } |
1889 | ||
4d1c52b0 LM |
1890 | /* |
1891 | * Start group events scheduling transaction | |
1892 | * Set the flag to make pmu::enable() not perform the | |
1893 | * schedulability test, it will be performed at commit time | |
fbbe0701 SB |
1894 | * |
1895 | * We only support PERF_PMU_TXN_ADD transactions. Save the | |
1896 | * transaction flags but otherwise ignore non-PERF_PMU_TXN_ADD | |
1897 | * transactions. | |
4d1c52b0 | 1898 | */ |
fbbe0701 | 1899 | static void x86_pmu_start_txn(struct pmu *pmu, unsigned int txn_flags) |
4d1c52b0 | 1900 | { |
fbbe0701 SB |
1901 | struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events); |
1902 | ||
1903 | WARN_ON_ONCE(cpuc->txn_flags); /* txn already in flight */ | |
1904 | ||
1905 | cpuc->txn_flags = txn_flags; | |
1906 | if (txn_flags & ~PERF_PMU_TXN_ADD) | |
1907 | return; | |
1908 | ||
33696fc0 | 1909 | perf_pmu_disable(pmu); |
0a3aee0d | 1910 | __this_cpu_write(cpu_hw_events.n_txn, 0); |
4d1c52b0 LM |
1911 | } |
1912 | ||
1913 | /* | |
1914 | * Stop group events scheduling transaction | |
1915 | * Clear the flag and pmu::enable() will perform the | |
1916 | * schedulability test. | |
1917 | */ | |
51b0fe39 | 1918 | static void x86_pmu_cancel_txn(struct pmu *pmu) |
4d1c52b0 | 1919 | { |
fbbe0701 SB |
1920 | unsigned int txn_flags; |
1921 | struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events); | |
1922 | ||
1923 | WARN_ON_ONCE(!cpuc->txn_flags); /* no txn in flight */ | |
1924 | ||
1925 | txn_flags = cpuc->txn_flags; | |
1926 | cpuc->txn_flags = 0; | |
1927 | if (txn_flags & ~PERF_PMU_TXN_ADD) | |
1928 | return; | |
1929 | ||
90151c35 | 1930 | /* |
c347a2f1 PZ |
1931 | * Truncate collected array by the number of events added in this |
1932 | * transaction. See x86_pmu_add() and x86_pmu_*_txn(). | |
90151c35 | 1933 | */ |
0a3aee0d TH |
1934 | __this_cpu_sub(cpu_hw_events.n_added, __this_cpu_read(cpu_hw_events.n_txn)); |
1935 | __this_cpu_sub(cpu_hw_events.n_events, __this_cpu_read(cpu_hw_events.n_txn)); | |
33696fc0 | 1936 | perf_pmu_enable(pmu); |
4d1c52b0 LM |
1937 | } |
1938 | ||
1939 | /* | |
1940 | * Commit group events scheduling transaction | |
1941 | * Perform the group schedulability test as a whole | |
1942 | * Return 0 if success | |
c347a2f1 PZ |
1943 | * |
1944 | * Does not cancel the transaction on failure; expects the caller to do this. | |
4d1c52b0 | 1945 | */ |
51b0fe39 | 1946 | static int x86_pmu_commit_txn(struct pmu *pmu) |
4d1c52b0 | 1947 | { |
89cbc767 | 1948 | struct cpu_hw_events *cpuc = this_cpu_ptr(&cpu_hw_events); |
4d1c52b0 LM |
1949 | int assign[X86_PMC_IDX_MAX]; |
1950 | int n, ret; | |
1951 | ||
fbbe0701 SB |
1952 | WARN_ON_ONCE(!cpuc->txn_flags); /* no txn in flight */ |
1953 | ||
1954 | if (cpuc->txn_flags & ~PERF_PMU_TXN_ADD) { | |
1955 | cpuc->txn_flags = 0; | |
1956 | return 0; | |
1957 | } | |
1958 | ||
4d1c52b0 LM |
1959 | n = cpuc->n_events; |
1960 | ||
1961 | if (!x86_pmu_initialized()) | |
1962 | return -EAGAIN; | |
1963 | ||
1964 | ret = x86_pmu.schedule_events(cpuc, n, assign); | |
1965 | if (ret) | |
1966 | return ret; | |
1967 | ||
1968 | /* | |
1969 | * copy new assignment, now we know it is possible | |
1970 | * will be used by hw_perf_enable() | |
1971 | */ | |
1972 | memcpy(cpuc->assign, assign, n*sizeof(int)); | |
1973 | ||
fbbe0701 | 1974 | cpuc->txn_flags = 0; |
33696fc0 | 1975 | perf_pmu_enable(pmu); |
4d1c52b0 LM |
1976 | return 0; |
1977 | } | |
cd8a38d3 SE |
1978 | /* |
1979 | * a fake_cpuc is used to validate event groups. Due to | |
1980 | * the extra reg logic, we need to also allocate a fake | |
1981 | * per_core and per_cpu structure. Otherwise, group events | |
1982 | * using extra reg may conflict without the kernel being | |
1983 | * able to catch this when the last event gets added to | |
1984 | * the group. | |
1985 | */ | |
1986 | static void free_fake_cpuc(struct cpu_hw_events *cpuc) | |
1987 | { | |
1988 | kfree(cpuc->shared_regs); | |
1989 | kfree(cpuc); | |
1990 | } | |
1991 | ||
1992 | static struct cpu_hw_events *allocate_fake_cpuc(void) | |
1993 | { | |
1994 | struct cpu_hw_events *cpuc; | |
1995 | int cpu = raw_smp_processor_id(); | |
1996 | ||
1997 | cpuc = kzalloc(sizeof(*cpuc), GFP_KERNEL); | |
1998 | if (!cpuc) | |
1999 | return ERR_PTR(-ENOMEM); | |
2000 | ||
2001 | /* only needed, if we have extra_regs */ | |
2002 | if (x86_pmu.extra_regs) { | |
2003 | cpuc->shared_regs = allocate_shared_regs(cpu); | |
2004 | if (!cpuc->shared_regs) | |
2005 | goto error; | |
2006 | } | |
b430f7c4 | 2007 | cpuc->is_fake = 1; |
cd8a38d3 SE |
2008 | return cpuc; |
2009 | error: | |
2010 | free_fake_cpuc(cpuc); | |
2011 | return ERR_PTR(-ENOMEM); | |
2012 | } | |
4d1c52b0 | 2013 | |
ca037701 PZ |
2014 | /* |
2015 | * validate that we can schedule this event | |
2016 | */ | |
2017 | static int validate_event(struct perf_event *event) | |
2018 | { | |
2019 | struct cpu_hw_events *fake_cpuc; | |
2020 | struct event_constraint *c; | |
2021 | int ret = 0; | |
2022 | ||
cd8a38d3 SE |
2023 | fake_cpuc = allocate_fake_cpuc(); |
2024 | if (IS_ERR(fake_cpuc)) | |
2025 | return PTR_ERR(fake_cpuc); | |
ca037701 | 2026 | |
79cba822 | 2027 | c = x86_pmu.get_event_constraints(fake_cpuc, -1, event); |
ca037701 PZ |
2028 | |
2029 | if (!c || !c->weight) | |
aa2bc1ad | 2030 | ret = -EINVAL; |
ca037701 PZ |
2031 | |
2032 | if (x86_pmu.put_event_constraints) | |
2033 | x86_pmu.put_event_constraints(fake_cpuc, event); | |
2034 | ||
cd8a38d3 | 2035 | free_fake_cpuc(fake_cpuc); |
ca037701 PZ |
2036 | |
2037 | return ret; | |
2038 | } | |
2039 | ||
1da53e02 SE |
2040 | /* |
2041 | * validate a single event group | |
2042 | * | |
2043 | * validation include: | |
184f412c IM |
2044 | * - check events are compatible which each other |
2045 | * - events do not compete for the same counter | |
2046 | * - number of events <= number of counters | |
1da53e02 SE |
2047 | * |
2048 | * validation ensures the group can be loaded onto the | |
2049 | * PMU if it was the only group available. | |
2050 | */ | |
fe9081cc PZ |
2051 | static int validate_group(struct perf_event *event) |
2052 | { | |
1da53e02 | 2053 | struct perf_event *leader = event->group_leader; |
502568d5 | 2054 | struct cpu_hw_events *fake_cpuc; |
aa2bc1ad | 2055 | int ret = -EINVAL, n; |
fe9081cc | 2056 | |
cd8a38d3 SE |
2057 | fake_cpuc = allocate_fake_cpuc(); |
2058 | if (IS_ERR(fake_cpuc)) | |
2059 | return PTR_ERR(fake_cpuc); | |
1da53e02 SE |
2060 | /* |
2061 | * the event is not yet connected with its | |
2062 | * siblings therefore we must first collect | |
2063 | * existing siblings, then add the new event | |
2064 | * before we can simulate the scheduling | |
2065 | */ | |
502568d5 | 2066 | n = collect_events(fake_cpuc, leader, true); |
1da53e02 | 2067 | if (n < 0) |
cd8a38d3 | 2068 | goto out; |
fe9081cc | 2069 | |
502568d5 PZ |
2070 | fake_cpuc->n_events = n; |
2071 | n = collect_events(fake_cpuc, event, false); | |
1da53e02 | 2072 | if (n < 0) |
cd8a38d3 | 2073 | goto out; |
fe9081cc | 2074 | |
502568d5 | 2075 | fake_cpuc->n_events = n; |
1da53e02 | 2076 | |
a072738e | 2077 | ret = x86_pmu.schedule_events(fake_cpuc, n, NULL); |
502568d5 | 2078 | |
502568d5 | 2079 | out: |
cd8a38d3 | 2080 | free_fake_cpuc(fake_cpuc); |
502568d5 | 2081 | return ret; |
fe9081cc PZ |
2082 | } |
2083 | ||
dda99116 | 2084 | static int x86_pmu_event_init(struct perf_event *event) |
621a01ea | 2085 | { |
51b0fe39 | 2086 | struct pmu *tmp; |
621a01ea IM |
2087 | int err; |
2088 | ||
b0a873eb PZ |
2089 | switch (event->attr.type) { |
2090 | case PERF_TYPE_RAW: | |
2091 | case PERF_TYPE_HARDWARE: | |
2092 | case PERF_TYPE_HW_CACHE: | |
2093 | break; | |
2094 | ||
2095 | default: | |
2096 | return -ENOENT; | |
2097 | } | |
2098 | ||
2099 | err = __x86_pmu_event_init(event); | |
fe9081cc | 2100 | if (!err) { |
8113070d SE |
2101 | /* |
2102 | * we temporarily connect event to its pmu | |
2103 | * such that validate_group() can classify | |
2104 | * it as an x86 event using is_x86_event() | |
2105 | */ | |
2106 | tmp = event->pmu; | |
2107 | event->pmu = &pmu; | |
2108 | ||
fe9081cc PZ |
2109 | if (event->group_leader != event) |
2110 | err = validate_group(event); | |
ca037701 PZ |
2111 | else |
2112 | err = validate_event(event); | |
8113070d SE |
2113 | |
2114 | event->pmu = tmp; | |
fe9081cc | 2115 | } |
a1792cda | 2116 | if (err) { |
cdd6c482 IM |
2117 | if (event->destroy) |
2118 | event->destroy(event); | |
a1792cda | 2119 | } |
621a01ea | 2120 | |
6aa7de05 | 2121 | if (READ_ONCE(x86_pmu.attr_rdpmc)) |
7911d3f7 AL |
2122 | event->hw.flags |= PERF_X86_EVENT_RDPMC_ALLOWED; |
2123 | ||
b0a873eb | 2124 | return err; |
621a01ea | 2125 | } |
d7d59fb3 | 2126 | |
7911d3f7 AL |
2127 | static void refresh_pce(void *ignored) |
2128 | { | |
3d28ebce | 2129 | load_mm_cr4(this_cpu_read(cpu_tlbstate.loaded_mm)); |
7911d3f7 AL |
2130 | } |
2131 | ||
bfe33492 | 2132 | static void x86_pmu_event_mapped(struct perf_event *event, struct mm_struct *mm) |
7911d3f7 AL |
2133 | { |
2134 | if (!(event->hw.flags & PERF_X86_EVENT_RDPMC_ALLOWED)) | |
2135 | return; | |
2136 | ||
4b07372a AL |
2137 | /* |
2138 | * This function relies on not being called concurrently in two | |
2139 | * tasks in the same mm. Otherwise one task could observe | |
2140 | * perf_rdpmc_allowed > 1 and return all the way back to | |
2141 | * userspace with CR4.PCE clear while another task is still | |
2142 | * doing on_each_cpu_mask() to propagate CR4.PCE. | |
2143 | * | |
2144 | * For now, this can't happen because all callers hold mmap_sem | |
2145 | * for write. If this changes, we'll need a different solution. | |
2146 | */ | |
bfe33492 | 2147 | lockdep_assert_held_exclusive(&mm->mmap_sem); |
4b07372a | 2148 | |
bfe33492 PZ |
2149 | if (atomic_inc_return(&mm->context.perf_rdpmc_allowed) == 1) |
2150 | on_each_cpu_mask(mm_cpumask(mm), refresh_pce, NULL, 1); | |
7911d3f7 AL |
2151 | } |
2152 | ||
bfe33492 | 2153 | static void x86_pmu_event_unmapped(struct perf_event *event, struct mm_struct *mm) |
7911d3f7 | 2154 | { |
7911d3f7 AL |
2155 | |
2156 | if (!(event->hw.flags & PERF_X86_EVENT_RDPMC_ALLOWED)) | |
2157 | return; | |
2158 | ||
bfe33492 PZ |
2159 | if (atomic_dec_and_test(&mm->context.perf_rdpmc_allowed)) |
2160 | on_each_cpu_mask(mm_cpumask(mm), refresh_pce, NULL, 1); | |
7911d3f7 AL |
2161 | } |
2162 | ||
fe4a3308 PZ |
2163 | static int x86_pmu_event_idx(struct perf_event *event) |
2164 | { | |
2165 | int idx = event->hw.idx; | |
2166 | ||
7911d3f7 | 2167 | if (!(event->hw.flags & PERF_X86_EVENT_RDPMC_ALLOWED)) |
c7206205 PZ |
2168 | return 0; |
2169 | ||
15c7ad51 RR |
2170 | if (x86_pmu.num_counters_fixed && idx >= INTEL_PMC_IDX_FIXED) { |
2171 | idx -= INTEL_PMC_IDX_FIXED; | |
fe4a3308 PZ |
2172 | idx |= 1 << 30; |
2173 | } | |
2174 | ||
2175 | return idx + 1; | |
2176 | } | |
2177 | ||
0c9d42ed PZ |
2178 | static ssize_t get_attr_rdpmc(struct device *cdev, |
2179 | struct device_attribute *attr, | |
2180 | char *buf) | |
2181 | { | |
2182 | return snprintf(buf, 40, "%d\n", x86_pmu.attr_rdpmc); | |
2183 | } | |
2184 | ||
0c9d42ed PZ |
2185 | static ssize_t set_attr_rdpmc(struct device *cdev, |
2186 | struct device_attribute *attr, | |
2187 | const char *buf, size_t count) | |
2188 | { | |
e2b297fc SK |
2189 | unsigned long val; |
2190 | ssize_t ret; | |
2191 | ||
2192 | ret = kstrtoul(buf, 0, &val); | |
2193 | if (ret) | |
2194 | return ret; | |
e97df763 | 2195 | |
a6673429 AL |
2196 | if (val > 2) |
2197 | return -EINVAL; | |
2198 | ||
e97df763 PZ |
2199 | if (x86_pmu.attr_rdpmc_broken) |
2200 | return -ENOTSUPP; | |
0c9d42ed | 2201 | |
a6673429 AL |
2202 | if ((val == 2) != (x86_pmu.attr_rdpmc == 2)) { |
2203 | /* | |
2204 | * Changing into or out of always available, aka | |
2205 | * perf-event-bypassing mode. This path is extremely slow, | |
2206 | * but only root can trigger it, so it's okay. | |
2207 | */ | |
2208 | if (val == 2) | |
2209 | static_key_slow_inc(&rdpmc_always_available); | |
2210 | else | |
2211 | static_key_slow_dec(&rdpmc_always_available); | |
2212 | on_each_cpu(refresh_pce, NULL, 1); | |
2213 | } | |
2214 | ||
2215 | x86_pmu.attr_rdpmc = val; | |
2216 | ||
0c9d42ed PZ |
2217 | return count; |
2218 | } | |
2219 | ||
2220 | static DEVICE_ATTR(rdpmc, S_IRUSR | S_IWUSR, get_attr_rdpmc, set_attr_rdpmc); | |
2221 | ||
2222 | static struct attribute *x86_pmu_attrs[] = { | |
2223 | &dev_attr_rdpmc.attr, | |
2224 | NULL, | |
2225 | }; | |
2226 | ||
2227 | static struct attribute_group x86_pmu_attr_group = { | |
2228 | .attrs = x86_pmu_attrs, | |
2229 | }; | |
2230 | ||
5da382eb PZ |
2231 | static ssize_t max_precise_show(struct device *cdev, |
2232 | struct device_attribute *attr, | |
2233 | char *buf) | |
2234 | { | |
2235 | return snprintf(buf, PAGE_SIZE, "%d\n", x86_pmu_max_precise()); | |
2236 | } | |
2237 | ||
2238 | static DEVICE_ATTR_RO(max_precise); | |
2239 | ||
2240 | static struct attribute *x86_pmu_caps_attrs[] = { | |
2241 | &dev_attr_max_precise.attr, | |
2242 | NULL | |
2243 | }; | |
2244 | ||
2245 | static struct attribute_group x86_pmu_caps_group = { | |
2246 | .name = "caps", | |
2247 | .attrs = x86_pmu_caps_attrs, | |
2248 | }; | |
2249 | ||
0c9d42ed PZ |
2250 | static const struct attribute_group *x86_pmu_attr_groups[] = { |
2251 | &x86_pmu_attr_group, | |
641cc938 | 2252 | &x86_pmu_format_group, |
a4747393 | 2253 | &x86_pmu_events_group, |
b00233b5 | 2254 | &x86_pmu_caps_group, |
0c9d42ed PZ |
2255 | NULL, |
2256 | }; | |
2257 | ||
ba532500 | 2258 | static void x86_pmu_sched_task(struct perf_event_context *ctx, bool sched_in) |
d010b332 | 2259 | { |
ba532500 YZ |
2260 | if (x86_pmu.sched_task) |
2261 | x86_pmu.sched_task(ctx, sched_in); | |
d010b332 SE |
2262 | } |
2263 | ||
c93dc84c PZ |
2264 | void perf_check_microcode(void) |
2265 | { | |
2266 | if (x86_pmu.check_microcode) | |
2267 | x86_pmu.check_microcode(); | |
2268 | } | |
c93dc84c | 2269 | |
b0a873eb | 2270 | static struct pmu pmu = { |
d010b332 SE |
2271 | .pmu_enable = x86_pmu_enable, |
2272 | .pmu_disable = x86_pmu_disable, | |
a4eaf7f1 | 2273 | |
c93dc84c | 2274 | .attr_groups = x86_pmu_attr_groups, |
0c9d42ed | 2275 | |
c93dc84c | 2276 | .event_init = x86_pmu_event_init, |
a4eaf7f1 | 2277 | |
7911d3f7 AL |
2278 | .event_mapped = x86_pmu_event_mapped, |
2279 | .event_unmapped = x86_pmu_event_unmapped, | |
2280 | ||
d010b332 SE |
2281 | .add = x86_pmu_add, |
2282 | .del = x86_pmu_del, | |
2283 | .start = x86_pmu_start, | |
2284 | .stop = x86_pmu_stop, | |
2285 | .read = x86_pmu_read, | |
a4eaf7f1 | 2286 | |
c93dc84c PZ |
2287 | .start_txn = x86_pmu_start_txn, |
2288 | .cancel_txn = x86_pmu_cancel_txn, | |
2289 | .commit_txn = x86_pmu_commit_txn, | |
fe4a3308 | 2290 | |
c93dc84c | 2291 | .event_idx = x86_pmu_event_idx, |
ba532500 | 2292 | .sched_task = x86_pmu_sched_task, |
e18bf526 | 2293 | .task_ctx_size = sizeof(struct x86_perf_task_context), |
b0a873eb PZ |
2294 | }; |
2295 | ||
c1317ec2 AL |
2296 | void arch_perf_update_userpage(struct perf_event *event, |
2297 | struct perf_event_mmap_page *userpg, u64 now) | |
e3f3541c | 2298 | { |
59eaef78 | 2299 | struct cyc2ns_data data; |
698eff63 | 2300 | u64 offset; |
20d1c86a | 2301 | |
fa731587 PZ |
2302 | userpg->cap_user_time = 0; |
2303 | userpg->cap_user_time_zero = 0; | |
7911d3f7 AL |
2304 | userpg->cap_user_rdpmc = |
2305 | !!(event->hw.flags & PERF_X86_EVENT_RDPMC_ALLOWED); | |
c7206205 PZ |
2306 | userpg->pmc_width = x86_pmu.cntval_bits; |
2307 | ||
698eff63 | 2308 | if (!using_native_sched_clock() || !sched_clock_stable()) |
e3f3541c PZ |
2309 | return; |
2310 | ||
59eaef78 | 2311 | cyc2ns_read_begin(&data); |
20d1c86a | 2312 | |
59eaef78 | 2313 | offset = data.cyc2ns_offset + __sched_clock_offset; |
698eff63 | 2314 | |
34f43927 PZ |
2315 | /* |
2316 | * Internal timekeeping for enabled/running/stopped times | |
2317 | * is always in the local_clock domain. | |
2318 | */ | |
fa731587 | 2319 | userpg->cap_user_time = 1; |
59eaef78 PZ |
2320 | userpg->time_mult = data.cyc2ns_mul; |
2321 | userpg->time_shift = data.cyc2ns_shift; | |
698eff63 | 2322 | userpg->time_offset = offset - now; |
c73deb6a | 2323 | |
34f43927 PZ |
2324 | /* |
2325 | * cap_user_time_zero doesn't make sense when we're using a different | |
2326 | * time base for the records. | |
2327 | */ | |
f454bfdd | 2328 | if (!event->attr.use_clockid) { |
34f43927 | 2329 | userpg->cap_user_time_zero = 1; |
698eff63 | 2330 | userpg->time_zero = offset; |
34f43927 | 2331 | } |
20d1c86a | 2332 | |
59eaef78 | 2333 | cyc2ns_read_end(); |
e3f3541c PZ |
2334 | } |
2335 | ||
56962b44 | 2336 | void |
cfbcf468 | 2337 | perf_callchain_kernel(struct perf_callchain_entry_ctx *entry, struct pt_regs *regs) |
d7d59fb3 | 2338 | { |
35f4d9b3 JP |
2339 | struct unwind_state state; |
2340 | unsigned long addr; | |
2341 | ||
927c7a9e FW |
2342 | if (perf_guest_cbs && perf_guest_cbs->is_in_guest()) { |
2343 | /* TODO: We don't support guest os callchain now */ | |
ed805261 | 2344 | return; |
927c7a9e FW |
2345 | } |
2346 | ||
019e579d JP |
2347 | if (perf_callchain_store(entry, regs->ip)) |
2348 | return; | |
d7d59fb3 | 2349 | |
35f4d9b3 JP |
2350 | for (unwind_start(&state, current, regs, NULL); !unwind_done(&state); |
2351 | unwind_next_frame(&state)) { | |
2352 | addr = unwind_get_return_address(&state); | |
2353 | if (!addr || perf_callchain_store(entry, addr)) | |
2354 | return; | |
2355 | } | |
d7d59fb3 PZ |
2356 | } |
2357 | ||
bc6ca7b3 AS |
2358 | static inline int |
2359 | valid_user_frame(const void __user *fp, unsigned long size) | |
2360 | { | |
2361 | return (__range_not_ok(fp, size, TASK_SIZE) == 0); | |
2362 | } | |
2363 | ||
d07bdfd3 PZ |
2364 | static unsigned long get_segment_base(unsigned int segment) |
2365 | { | |
2366 | struct desc_struct *desc; | |
990e9dc3 | 2367 | unsigned int idx = segment >> 3; |
d07bdfd3 PZ |
2368 | |
2369 | if ((segment & SEGMENT_TI_MASK) == SEGMENT_LDT) { | |
a5b9e5a2 | 2370 | #ifdef CONFIG_MODIFY_LDT_SYSCALL |
37868fe1 AL |
2371 | struct ldt_struct *ldt; |
2372 | ||
37868fe1 | 2373 | /* IRQs are off, so this synchronizes with smp_store_release */ |
506458ef | 2374 | ldt = READ_ONCE(current->active_mm->context.ldt); |
eaa2f87c | 2375 | if (!ldt || idx >= ldt->nr_entries) |
d07bdfd3 PZ |
2376 | return 0; |
2377 | ||
37868fe1 | 2378 | desc = &ldt->entries[idx]; |
a5b9e5a2 AL |
2379 | #else |
2380 | return 0; | |
2381 | #endif | |
d07bdfd3 | 2382 | } else { |
eaa2f87c | 2383 | if (idx >= GDT_ENTRIES) |
d07bdfd3 PZ |
2384 | return 0; |
2385 | ||
37868fe1 | 2386 | desc = raw_cpu_ptr(gdt_page.gdt) + idx; |
d07bdfd3 PZ |
2387 | } |
2388 | ||
37868fe1 | 2389 | return get_desc_base(desc); |
d07bdfd3 PZ |
2390 | } |
2391 | ||
10ed3493 | 2392 | #ifdef CONFIG_IA32_EMULATION |
d1a797f3 PA |
2393 | |
2394 | #include <asm/compat.h> | |
2395 | ||
257ef9d2 | 2396 | static inline int |
cfbcf468 | 2397 | perf_callchain_user32(struct pt_regs *regs, struct perf_callchain_entry_ctx *entry) |
74193ef0 | 2398 | { |
257ef9d2 | 2399 | /* 32-bit process in 64-bit kernel. */ |
d07bdfd3 | 2400 | unsigned long ss_base, cs_base; |
257ef9d2 TE |
2401 | struct stack_frame_ia32 frame; |
2402 | const void __user *fp; | |
74193ef0 | 2403 | |
257ef9d2 TE |
2404 | if (!test_thread_flag(TIF_IA32)) |
2405 | return 0; | |
2406 | ||
d07bdfd3 PZ |
2407 | cs_base = get_segment_base(regs->cs); |
2408 | ss_base = get_segment_base(regs->ss); | |
2409 | ||
2410 | fp = compat_ptr(ss_base + regs->bp); | |
75925e1a | 2411 | pagefault_disable(); |
3b1fff08 | 2412 | while (entry->nr < entry->max_stack) { |
257ef9d2 TE |
2413 | unsigned long bytes; |
2414 | frame.next_frame = 0; | |
2415 | frame.return_address = 0; | |
2416 | ||
ae31fe51 | 2417 | if (!valid_user_frame(fp, sizeof(frame))) |
75925e1a AK |
2418 | break; |
2419 | ||
2420 | bytes = __copy_from_user_nmi(&frame.next_frame, fp, 4); | |
2421 | if (bytes != 0) | |
2422 | break; | |
2423 | bytes = __copy_from_user_nmi(&frame.return_address, fp+4, 4); | |
0a196848 | 2424 | if (bytes != 0) |
257ef9d2 | 2425 | break; |
74193ef0 | 2426 | |
d07bdfd3 PZ |
2427 | perf_callchain_store(entry, cs_base + frame.return_address); |
2428 | fp = compat_ptr(ss_base + frame.next_frame); | |
257ef9d2 | 2429 | } |
75925e1a | 2430 | pagefault_enable(); |
257ef9d2 | 2431 | return 1; |
d7d59fb3 | 2432 | } |
257ef9d2 TE |
2433 | #else |
2434 | static inline int | |
cfbcf468 | 2435 | perf_callchain_user32(struct pt_regs *regs, struct perf_callchain_entry_ctx *entry) |
257ef9d2 TE |
2436 | { |
2437 | return 0; | |
2438 | } | |
2439 | #endif | |
d7d59fb3 | 2440 | |
56962b44 | 2441 | void |
cfbcf468 | 2442 | perf_callchain_user(struct perf_callchain_entry_ctx *entry, struct pt_regs *regs) |
d7d59fb3 PZ |
2443 | { |
2444 | struct stack_frame frame; | |
fc188225 | 2445 | const unsigned long __user *fp; |
d7d59fb3 | 2446 | |
927c7a9e FW |
2447 | if (perf_guest_cbs && perf_guest_cbs->is_in_guest()) { |
2448 | /* TODO: We don't support guest os callchain now */ | |
ed805261 | 2449 | return; |
927c7a9e | 2450 | } |
5a6cec3a | 2451 | |
d07bdfd3 PZ |
2452 | /* |
2453 | * We don't know what to do with VM86 stacks.. ignore them for now. | |
2454 | */ | |
2455 | if (regs->flags & (X86_VM_MASK | PERF_EFLAGS_VM)) | |
2456 | return; | |
2457 | ||
fc188225 | 2458 | fp = (unsigned long __user *)regs->bp; |
d7d59fb3 | 2459 | |
70791ce9 | 2460 | perf_callchain_store(entry, regs->ip); |
d7d59fb3 | 2461 | |
20afc60f AV |
2462 | if (!current->mm) |
2463 | return; | |
2464 | ||
257ef9d2 TE |
2465 | if (perf_callchain_user32(regs, entry)) |
2466 | return; | |
2467 | ||
75925e1a | 2468 | pagefault_disable(); |
3b1fff08 | 2469 | while (entry->nr < entry->max_stack) { |
257ef9d2 | 2470 | unsigned long bytes; |
fc188225 | 2471 | |
038e836e | 2472 | frame.next_frame = NULL; |
d7d59fb3 PZ |
2473 | frame.return_address = 0; |
2474 | ||
ae31fe51 | 2475 | if (!valid_user_frame(fp, sizeof(frame))) |
75925e1a AK |
2476 | break; |
2477 | ||
fc188225 | 2478 | bytes = __copy_from_user_nmi(&frame.next_frame, fp, sizeof(*fp)); |
75925e1a AK |
2479 | if (bytes != 0) |
2480 | break; | |
fc188225 | 2481 | bytes = __copy_from_user_nmi(&frame.return_address, fp + 1, sizeof(*fp)); |
0a196848 | 2482 | if (bytes != 0) |
d7d59fb3 PZ |
2483 | break; |
2484 | ||
70791ce9 | 2485 | perf_callchain_store(entry, frame.return_address); |
75925e1a | 2486 | fp = (void __user *)frame.next_frame; |
d7d59fb3 | 2487 | } |
75925e1a | 2488 | pagefault_enable(); |
d7d59fb3 PZ |
2489 | } |
2490 | ||
d07bdfd3 PZ |
2491 | /* |
2492 | * Deal with code segment offsets for the various execution modes: | |
2493 | * | |
2494 | * VM86 - the good olde 16 bit days, where the linear address is | |
2495 | * 20 bits and we use regs->ip + 0x10 * regs->cs. | |
2496 | * | |
2497 | * IA32 - Where we need to look at GDT/LDT segment descriptor tables | |
2498 | * to figure out what the 32bit base address is. | |
2499 | * | |
2500 | * X32 - has TIF_X32 set, but is running in x86_64 | |
2501 | * | |
2502 | * X86_64 - CS,DS,SS,ES are all zero based. | |
2503 | */ | |
2504 | static unsigned long code_segment_base(struct pt_regs *regs) | |
39447b38 | 2505 | { |
383f3af3 AL |
2506 | /* |
2507 | * For IA32 we look at the GDT/LDT segment base to convert the | |
2508 | * effective IP to a linear address. | |
2509 | */ | |
2510 | ||
2511 | #ifdef CONFIG_X86_32 | |
d07bdfd3 PZ |
2512 | /* |
2513 | * If we are in VM86 mode, add the segment offset to convert to a | |
2514 | * linear address. | |
2515 | */ | |
2516 | if (regs->flags & X86_VM_MASK) | |
2517 | return 0x10 * regs->cs; | |
2518 | ||
55474c48 | 2519 | if (user_mode(regs) && regs->cs != __USER_CS) |
d07bdfd3 PZ |
2520 | return get_segment_base(regs->cs); |
2521 | #else | |
c56716af AL |
2522 | if (user_mode(regs) && !user_64bit_mode(regs) && |
2523 | regs->cs != __USER32_CS) | |
2524 | return get_segment_base(regs->cs); | |
d07bdfd3 PZ |
2525 | #endif |
2526 | return 0; | |
2527 | } | |
dcf46b94 | 2528 | |
d07bdfd3 PZ |
2529 | unsigned long perf_instruction_pointer(struct pt_regs *regs) |
2530 | { | |
39447b38 | 2531 | if (perf_guest_cbs && perf_guest_cbs->is_in_guest()) |
d07bdfd3 | 2532 | return perf_guest_cbs->get_guest_ip(); |
dcf46b94 | 2533 | |
d07bdfd3 | 2534 | return regs->ip + code_segment_base(regs); |
39447b38 ZY |
2535 | } |
2536 | ||
2537 | unsigned long perf_misc_flags(struct pt_regs *regs) | |
2538 | { | |
2539 | int misc = 0; | |
dcf46b94 | 2540 | |
39447b38 | 2541 | if (perf_guest_cbs && perf_guest_cbs->is_in_guest()) { |
dcf46b94 ZY |
2542 | if (perf_guest_cbs->is_user_mode()) |
2543 | misc |= PERF_RECORD_MISC_GUEST_USER; | |
2544 | else | |
2545 | misc |= PERF_RECORD_MISC_GUEST_KERNEL; | |
2546 | } else { | |
d07bdfd3 | 2547 | if (user_mode(regs)) |
dcf46b94 ZY |
2548 | misc |= PERF_RECORD_MISC_USER; |
2549 | else | |
2550 | misc |= PERF_RECORD_MISC_KERNEL; | |
2551 | } | |
2552 | ||
39447b38 | 2553 | if (regs->flags & PERF_EFLAGS_EXACT) |
ab608344 | 2554 | misc |= PERF_RECORD_MISC_EXACT_IP; |
39447b38 ZY |
2555 | |
2556 | return misc; | |
2557 | } | |
b3d9468a GN |
2558 | |
2559 | void perf_get_x86_pmu_capability(struct x86_pmu_capability *cap) | |
2560 | { | |
2561 | cap->version = x86_pmu.version; | |
2562 | cap->num_counters_gp = x86_pmu.num_counters; | |
2563 | cap->num_counters_fixed = x86_pmu.num_counters_fixed; | |
2564 | cap->bit_width_gp = x86_pmu.cntval_bits; | |
2565 | cap->bit_width_fixed = x86_pmu.cntval_bits; | |
2566 | cap->events_mask = (unsigned int)x86_pmu.events_maskl; | |
2567 | cap->events_mask_len = x86_pmu.events_mask_len; | |
2568 | } | |
2569 | EXPORT_SYMBOL_GPL(perf_get_x86_pmu_capability); |