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perf: Generalize callchain_store()
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / arch / sparc / kernel / perf_event.c
blob2a95a9079862cc00d739bd9bc8844048d534ac4b
1 /* Performance event support for sparc64.
2 *
3 * Copyright (C) 2009, 2010 David S. Miller <davem@davemloft.net>
4 *
5 * This code is based almost entirely upon the x86 perf event
6 * code, which is:
7 *
8 * Copyright (C) 2008 Thomas Gleixner <tglx@linutronix.de>
9 * Copyright (C) 2008-2009 Red Hat, Inc., Ingo Molnar
10 * Copyright (C) 2009 Jaswinder Singh Rajput
11 * Copyright (C) 2009 Advanced Micro Devices, Inc., Robert Richter
12 * Copyright (C) 2008-2009 Red Hat, Inc., Peter Zijlstra <pzijlstr@redhat.com>
13 */
14
15 #include <linux/perf_event.h>
16 #include <linux/kprobes.h>
17 #include <linux/ftrace.h>
18 #include <linux/kernel.h>
19 #include <linux/kdebug.h>
20 #include <linux/mutex.h>
21
22 #include <asm/stacktrace.h>
23 #include <asm/cpudata.h>
24 #include <asm/uaccess.h>
25 #include <asm/atomic.h>
26 #include <asm/nmi.h>
27 #include <asm/pcr.h>
28
29 #include "kstack.h"
30
31 /* Sparc64 chips have two performance counters, 32-bits each, with
32 * overflow interrupts generated on transition from 0xffffffff to 0.
33 * The counters are accessed in one go using a 64-bit register.
34 *
35 * Both counters are controlled using a single control register. The
36 * only way to stop all sampling is to clear all of the context (user,
37 * supervisor, hypervisor) sampling enable bits. But these bits apply
38 * to both counters, thus the two counters can't be enabled/disabled
39 * individually.
40 *
41 * The control register has two event fields, one for each of the two
42 * counters. It's thus nearly impossible to have one counter going
43 * while keeping the other one stopped. Therefore it is possible to
44 * get overflow interrupts for counters not currently "in use" and
45 * that condition must be checked in the overflow interrupt handler.
46 *
47 * So we use a hack, in that we program inactive counters with the
48 * "sw_count0" and "sw_count1" events. These count how many times
49 * the instruction "sethi %hi(0xfc000), %g0" is executed. It's an
50 * unusual way to encode a NOP and therefore will not trigger in
51 * normal code.
52 */
53
54 #define MAX_HWEVENTS 2
55 #define MAX_PERIOD ((1UL << 32) - 1)
56
57 #define PIC_UPPER_INDEX 0
58 #define PIC_LOWER_INDEX 1
59 #define PIC_NO_INDEX -1
60
61 struct cpu_hw_events {
62 /* Number of events currently scheduled onto this cpu.
63 * This tells how many entries in the arrays below
64 * are valid.
65 */
66 int n_events;
67
68 /* Number of new events added since the last hw_perf_disable().
69 * This works because the perf event layer always adds new
70 * events inside of a perf_{disable,enable}() sequence.
71 */
72 int n_added;
73
74 /* Array of events current scheduled on this cpu. */
75 struct perf_event *event[MAX_HWEVENTS];
76
77 /* Array of encoded longs, specifying the %pcr register
78 * encoding and the mask of PIC counters this even can
79 * be scheduled on. See perf_event_encode() et al.
80 */
81 unsigned long events[MAX_HWEVENTS];
82
83 /* The current counter index assigned to an event. When the
84 * event hasn't been programmed into the cpu yet, this will
85 * hold PIC_NO_INDEX. The event->hw.idx value tells us where
86 * we ought to schedule the event.
87 */
88 int current_idx[MAX_HWEVENTS];
89
90 /* Software copy of %pcr register on this cpu. */
91 u64 pcr;
92
93 /* Enabled/disable state. */
94 int enabled;
95
96 unsigned int group_flag;
97 };
98 DEFINE_PER_CPU(struct cpu_hw_events, cpu_hw_events) = { .enabled = 1, };
99
100 /* An event map describes the characteristics of a performance
101 * counter event. In particular it gives the encoding as well as
102 * a mask telling which counters the event can be measured on.
103 */
104 struct perf_event_map {
105 u16 encoding;
106 u8 pic_mask;
107 #define PIC_NONE 0x00
108 #define PIC_UPPER 0x01
109 #define PIC_LOWER 0x02
110 };
111
112 /* Encode a perf_event_map entry into a long. */
113 static unsigned long perf_event_encode(const struct perf_event_map *pmap)
114 {
115 return ((unsigned long) pmap->encoding << 16) | pmap->pic_mask;
116 }
117
118 static u8 perf_event_get_msk(unsigned long val)
119 {
120 return val & 0xff;
121 }
122
123 static u64 perf_event_get_enc(unsigned long val)
124 {
125 return val >> 16;
126 }
127
128 #define C(x) PERF_COUNT_HW_CACHE_##x
129
130 #define CACHE_OP_UNSUPPORTED 0xfffe
131 #define CACHE_OP_NONSENSE 0xffff
132
133 typedef struct perf_event_map cache_map_t
134 [PERF_COUNT_HW_CACHE_MAX]
135 [PERF_COUNT_HW_CACHE_OP_MAX]
136 [PERF_COUNT_HW_CACHE_RESULT_MAX];
137
138 struct sparc_pmu {
139 const struct perf_event_map *(*event_map)(int);
140 const cache_map_t *cache_map;
141 int max_events;
142 int upper_shift;
143 int lower_shift;
144 int event_mask;
145 int hv_bit;
146 int irq_bit;
147 int upper_nop;
148 int lower_nop;
149 };
150
151 static const struct perf_event_map ultra3_perfmon_event_map[] = {
152 [PERF_COUNT_HW_CPU_CYCLES] = { 0x0000, PIC_UPPER | PIC_LOWER },
153 [PERF_COUNT_HW_INSTRUCTIONS] = { 0x0001, PIC_UPPER | PIC_LOWER },
154 [PERF_COUNT_HW_CACHE_REFERENCES] = { 0x0009, PIC_LOWER },
155 [PERF_COUNT_HW_CACHE_MISSES] = { 0x0009, PIC_UPPER },
156 };
157
158 static const struct perf_event_map *ultra3_event_map(int event_id)
159 {
160 return &ultra3_perfmon_event_map[event_id];
161 }
162
163 static const cache_map_t ultra3_cache_map = {
164 [C(L1D)] = {
165 [C(OP_READ)] = {
166 [C(RESULT_ACCESS)] = { 0x09, PIC_LOWER, },
167 [C(RESULT_MISS)] = { 0x09, PIC_UPPER, },
168 },
169 [C(OP_WRITE)] = {
170 [C(RESULT_ACCESS)] = { 0x0a, PIC_LOWER },
171 [C(RESULT_MISS)] = { 0x0a, PIC_UPPER },
172 },
173 [C(OP_PREFETCH)] = {
174 [C(RESULT_ACCESS)] = { CACHE_OP_UNSUPPORTED },
175 [C(RESULT_MISS)] = { CACHE_OP_UNSUPPORTED },
176 },
177 },
178 [C(L1I)] = {
179 [C(OP_READ)] = {
180 [C(RESULT_ACCESS)] = { 0x09, PIC_LOWER, },
181 [C(RESULT_MISS)] = { 0x09, PIC_UPPER, },
182 },
183 [ C(OP_WRITE) ] = {
184 [ C(RESULT_ACCESS) ] = { CACHE_OP_NONSENSE },
185 [ C(RESULT_MISS) ] = { CACHE_OP_NONSENSE },
186 },
187 [ C(OP_PREFETCH) ] = {
188 [ C(RESULT_ACCESS) ] = { CACHE_OP_UNSUPPORTED },
189 [ C(RESULT_MISS) ] = { CACHE_OP_UNSUPPORTED },
190 },
191 },
192 [C(LL)] = {
193 [C(OP_READ)] = {
194 [C(RESULT_ACCESS)] = { 0x0c, PIC_LOWER, },
195 [C(RESULT_MISS)] = { 0x0c, PIC_UPPER, },
196 },
197 [C(OP_WRITE)] = {
198 [C(RESULT_ACCESS)] = { 0x0c, PIC_LOWER },
199 [C(RESULT_MISS)] = { 0x0c, PIC_UPPER },
200 },
201 [C(OP_PREFETCH)] = {
202 [C(RESULT_ACCESS)] = { CACHE_OP_UNSUPPORTED },
203 [C(RESULT_MISS)] = { CACHE_OP_UNSUPPORTED },
204 },
205 },
206 [C(DTLB)] = {
207 [C(OP_READ)] = {
208 [C(RESULT_ACCESS)] = { CACHE_OP_UNSUPPORTED },
209 [C(RESULT_MISS)] = { 0x12, PIC_UPPER, },
210 },
211 [ C(OP_WRITE) ] = {
212 [ C(RESULT_ACCESS) ] = { CACHE_OP_UNSUPPORTED },
213 [ C(RESULT_MISS) ] = { CACHE_OP_UNSUPPORTED },
214 },
215 [ C(OP_PREFETCH) ] = {
216 [ C(RESULT_ACCESS) ] = { CACHE_OP_UNSUPPORTED },
217 [ C(RESULT_MISS) ] = { CACHE_OP_UNSUPPORTED },
218 },
219 },
220 [C(ITLB)] = {
221 [C(OP_READ)] = {
222 [C(RESULT_ACCESS)] = { CACHE_OP_UNSUPPORTED },
223 [C(RESULT_MISS)] = { 0x11, PIC_UPPER, },
224 },
225 [ C(OP_WRITE) ] = {
226 [ C(RESULT_ACCESS) ] = { CACHE_OP_UNSUPPORTED },
227 [ C(RESULT_MISS) ] = { CACHE_OP_UNSUPPORTED },
228 },
229 [ C(OP_PREFETCH) ] = {
230 [ C(RESULT_ACCESS) ] = { CACHE_OP_UNSUPPORTED },
231 [ C(RESULT_MISS) ] = { CACHE_OP_UNSUPPORTED },
232 },
233 },
234 [C(BPU)] = {
235 [C(OP_READ)] = {
236 [C(RESULT_ACCESS)] = { CACHE_OP_UNSUPPORTED },
237 [C(RESULT_MISS)] = { CACHE_OP_UNSUPPORTED },
238 },
239 [ C(OP_WRITE) ] = {
240 [ C(RESULT_ACCESS) ] = { CACHE_OP_UNSUPPORTED },
241 [ C(RESULT_MISS) ] = { CACHE_OP_UNSUPPORTED },
242 },
243 [ C(OP_PREFETCH) ] = {
244 [ C(RESULT_ACCESS) ] = { CACHE_OP_UNSUPPORTED },
245 [ C(RESULT_MISS) ] = { CACHE_OP_UNSUPPORTED },
246 },
247 },
248 };
249
250 static const struct sparc_pmu ultra3_pmu = {
251 .event_map = ultra3_event_map,
252 .cache_map = &ultra3_cache_map,
253 .max_events = ARRAY_SIZE(ultra3_perfmon_event_map),
254 .upper_shift = 11,
255 .lower_shift = 4,
256 .event_mask = 0x3f,
257 .upper_nop = 0x1c,
258 .lower_nop = 0x14,
259 };
260
261 /* Niagara1 is very limited. The upper PIC is hard-locked to count
262 * only instructions, so it is free running which creates all kinds of
263 * problems. Some hardware designs make one wonder if the creator
264 * even looked at how this stuff gets used by software.
265 */
266 static const struct perf_event_map niagara1_perfmon_event_map[] = {
267 [PERF_COUNT_HW_CPU_CYCLES] = { 0x00, PIC_UPPER },
268 [PERF_COUNT_HW_INSTRUCTIONS] = { 0x00, PIC_UPPER },
269 [PERF_COUNT_HW_CACHE_REFERENCES] = { 0, PIC_NONE },
270 [PERF_COUNT_HW_CACHE_MISSES] = { 0x03, PIC_LOWER },
271 };
272
273 static const struct perf_event_map *niagara1_event_map(int event_id)
274 {
275 return &niagara1_perfmon_event_map[event_id];
276 }
277
278 static const cache_map_t niagara1_cache_map = {
279 [C(L1D)] = {
280 [C(OP_READ)] = {
281 [C(RESULT_ACCESS)] = { CACHE_OP_UNSUPPORTED },
282 [C(RESULT_MISS)] = { 0x03, PIC_LOWER, },
283 },
284 [C(OP_WRITE)] = {
285 [C(RESULT_ACCESS)] = { CACHE_OP_UNSUPPORTED },
286 [C(RESULT_MISS)] = { 0x03, PIC_LOWER, },
287 },
288 [C(OP_PREFETCH)] = {
289 [C(RESULT_ACCESS)] = { CACHE_OP_UNSUPPORTED },
290 [C(RESULT_MISS)] = { CACHE_OP_UNSUPPORTED },
291 },
292 },
293 [C(L1I)] = {
294 [C(OP_READ)] = {
295 [C(RESULT_ACCESS)] = { 0x00, PIC_UPPER },
296 [C(RESULT_MISS)] = { 0x02, PIC_LOWER, },
297 },
298 [ C(OP_WRITE) ] = {
299 [ C(RESULT_ACCESS) ] = { CACHE_OP_NONSENSE },
300 [ C(RESULT_MISS) ] = { CACHE_OP_NONSENSE },
301 },
302 [ C(OP_PREFETCH) ] = {
303 [ C(RESULT_ACCESS) ] = { CACHE_OP_UNSUPPORTED },
304 [ C(RESULT_MISS) ] = { CACHE_OP_UNSUPPORTED },
305 },
306 },
307 [C(LL)] = {
308 [C(OP_READ)] = {
309 [C(RESULT_ACCESS)] = { CACHE_OP_UNSUPPORTED },
310 [C(RESULT_MISS)] = { 0x07, PIC_LOWER, },
311 },
312 [C(OP_WRITE)] = {
313 [C(RESULT_ACCESS)] = { CACHE_OP_UNSUPPORTED },
314 [C(RESULT_MISS)] = { 0x07, PIC_LOWER, },
315 },
316 [C(OP_PREFETCH)] = {
317 [C(RESULT_ACCESS)] = { CACHE_OP_UNSUPPORTED },
318 [C(RESULT_MISS)] = { CACHE_OP_UNSUPPORTED },
319 },
320 },
321 [C(DTLB)] = {
322 [C(OP_READ)] = {
323 [C(RESULT_ACCESS)] = { CACHE_OP_UNSUPPORTED },
324 [C(RESULT_MISS)] = { 0x05, PIC_LOWER, },
325 },
326 [ C(OP_WRITE) ] = {
327 [ C(RESULT_ACCESS) ] = { CACHE_OP_UNSUPPORTED },
328 [ C(RESULT_MISS) ] = { CACHE_OP_UNSUPPORTED },
329 },
330 [ C(OP_PREFETCH) ] = {
331 [ C(RESULT_ACCESS) ] = { CACHE_OP_UNSUPPORTED },
332 [ C(RESULT_MISS) ] = { CACHE_OP_UNSUPPORTED },
333 },
334 },
335 [C(ITLB)] = {
336 [C(OP_READ)] = {
337 [C(RESULT_ACCESS)] = { CACHE_OP_UNSUPPORTED },
338 [C(RESULT_MISS)] = { 0x04, PIC_LOWER, },
339 },
340 [ C(OP_WRITE) ] = {
341 [ C(RESULT_ACCESS) ] = { CACHE_OP_UNSUPPORTED },
342 [ C(RESULT_MISS) ] = { CACHE_OP_UNSUPPORTED },
343 },
344 [ C(OP_PREFETCH) ] = {
345 [ C(RESULT_ACCESS) ] = { CACHE_OP_UNSUPPORTED },
346 [ C(RESULT_MISS) ] = { CACHE_OP_UNSUPPORTED },
347 },
348 },
349 [C(BPU)] = {
350 [C(OP_READ)] = {
351 [C(RESULT_ACCESS)] = { CACHE_OP_UNSUPPORTED },
352 [C(RESULT_MISS)] = { CACHE_OP_UNSUPPORTED },
353 },
354 [ C(OP_WRITE) ] = {
355 [ C(RESULT_ACCESS) ] = { CACHE_OP_UNSUPPORTED },
356 [ C(RESULT_MISS) ] = { CACHE_OP_UNSUPPORTED },
357 },
358 [ C(OP_PREFETCH) ] = {
359 [ C(RESULT_ACCESS) ] = { CACHE_OP_UNSUPPORTED },
360 [ C(RESULT_MISS) ] = { CACHE_OP_UNSUPPORTED },
361 },
362 },
363 };
364
365 static const struct sparc_pmu niagara1_pmu = {
366 .event_map = niagara1_event_map,
367 .cache_map = &niagara1_cache_map,
368 .max_events = ARRAY_SIZE(niagara1_perfmon_event_map),
369 .upper_shift = 0,
370 .lower_shift = 4,
371 .event_mask = 0x7,
372 .upper_nop = 0x0,
373 .lower_nop = 0x0,
374 };
375
376 static const struct perf_event_map niagara2_perfmon_event_map[] = {
377 [PERF_COUNT_HW_CPU_CYCLES] = { 0x02ff, PIC_UPPER | PIC_LOWER },
378 [PERF_COUNT_HW_INSTRUCTIONS] = { 0x02ff, PIC_UPPER | PIC_LOWER },
379 [PERF_COUNT_HW_CACHE_REFERENCES] = { 0x0208, PIC_UPPER | PIC_LOWER },
380 [PERF_COUNT_HW_CACHE_MISSES] = { 0x0302, PIC_UPPER | PIC_LOWER },
381 [PERF_COUNT_HW_BRANCH_INSTRUCTIONS] = { 0x0201, PIC_UPPER | PIC_LOWER },
382 [PERF_COUNT_HW_BRANCH_MISSES] = { 0x0202, PIC_UPPER | PIC_LOWER },
383 };
384
385 static const struct perf_event_map *niagara2_event_map(int event_id)
386 {
387 return &niagara2_perfmon_event_map[event_id];
388 }
389
390 static const cache_map_t niagara2_cache_map = {
391 [C(L1D)] = {
392 [C(OP_READ)] = {
393 [C(RESULT_ACCESS)] = { 0x0208, PIC_UPPER | PIC_LOWER, },
394 [C(RESULT_MISS)] = { 0x0302, PIC_UPPER | PIC_LOWER, },
395 },
396 [C(OP_WRITE)] = {
397 [C(RESULT_ACCESS)] = { 0x0210, PIC_UPPER | PIC_LOWER, },
398 [C(RESULT_MISS)] = { 0x0302, PIC_UPPER | PIC_LOWER, },
399 },
400 [C(OP_PREFETCH)] = {
401 [C(RESULT_ACCESS)] = { CACHE_OP_UNSUPPORTED },
402 [C(RESULT_MISS)] = { CACHE_OP_UNSUPPORTED },
403 },
404 },
405 [C(L1I)] = {
406 [C(OP_READ)] = {
407 [C(RESULT_ACCESS)] = { 0x02ff, PIC_UPPER | PIC_LOWER, },
408 [C(RESULT_MISS)] = { 0x0301, PIC_UPPER | PIC_LOWER, },
409 },
410 [ C(OP_WRITE) ] = {
411 [ C(RESULT_ACCESS) ] = { CACHE_OP_NONSENSE },
412 [ C(RESULT_MISS) ] = { CACHE_OP_NONSENSE },
413 },
414 [ C(OP_PREFETCH) ] = {
415 [ C(RESULT_ACCESS) ] = { CACHE_OP_UNSUPPORTED },
416 [ C(RESULT_MISS) ] = { CACHE_OP_UNSUPPORTED },
417 },
418 },
419 [C(LL)] = {
420 [C(OP_READ)] = {
421 [C(RESULT_ACCESS)] = { 0x0208, PIC_UPPER | PIC_LOWER, },
422 [C(RESULT_MISS)] = { 0x0330, PIC_UPPER | PIC_LOWER, },
423 },
424 [C(OP_WRITE)] = {
425 [C(RESULT_ACCESS)] = { 0x0210, PIC_UPPER | PIC_LOWER, },
426 [C(RESULT_MISS)] = { 0x0320, PIC_UPPER | PIC_LOWER, },
427 },
428 [C(OP_PREFETCH)] = {
429 [C(RESULT_ACCESS)] = { CACHE_OP_UNSUPPORTED },
430 [C(RESULT_MISS)] = { CACHE_OP_UNSUPPORTED },
431 },
432 },
433 [C(DTLB)] = {
434 [C(OP_READ)] = {
435 [C(RESULT_ACCESS)] = { CACHE_OP_UNSUPPORTED },
436 [C(RESULT_MISS)] = { 0x0b08, PIC_UPPER | PIC_LOWER, },
437 },
438 [ C(OP_WRITE) ] = {
439 [ C(RESULT_ACCESS) ] = { CACHE_OP_UNSUPPORTED },
440 [ C(RESULT_MISS) ] = { CACHE_OP_UNSUPPORTED },
441 },
442 [ C(OP_PREFETCH) ] = {
443 [ C(RESULT_ACCESS) ] = { CACHE_OP_UNSUPPORTED },
444 [ C(RESULT_MISS) ] = { CACHE_OP_UNSUPPORTED },
445 },
446 },
447 [C(ITLB)] = {
448 [C(OP_READ)] = {
449 [C(RESULT_ACCESS)] = { CACHE_OP_UNSUPPORTED },
450 [C(RESULT_MISS)] = { 0xb04, PIC_UPPER | PIC_LOWER, },
451 },
452 [ C(OP_WRITE) ] = {
453 [ C(RESULT_ACCESS) ] = { CACHE_OP_UNSUPPORTED },
454 [ C(RESULT_MISS) ] = { CACHE_OP_UNSUPPORTED },
455 },
456 [ C(OP_PREFETCH) ] = {
457 [ C(RESULT_ACCESS) ] = { CACHE_OP_UNSUPPORTED },
458 [ C(RESULT_MISS) ] = { CACHE_OP_UNSUPPORTED },
459 },
460 },
461 [C(BPU)] = {
462 [C(OP_READ)] = {
463 [C(RESULT_ACCESS)] = { CACHE_OP_UNSUPPORTED },
464 [C(RESULT_MISS)] = { CACHE_OP_UNSUPPORTED },
465 },
466 [ C(OP_WRITE) ] = {
467 [ C(RESULT_ACCESS) ] = { CACHE_OP_UNSUPPORTED },
468 [ C(RESULT_MISS) ] = { CACHE_OP_UNSUPPORTED },
469 },
470 [ C(OP_PREFETCH) ] = {
471 [ C(RESULT_ACCESS) ] = { CACHE_OP_UNSUPPORTED },
472 [ C(RESULT_MISS) ] = { CACHE_OP_UNSUPPORTED },
473 },
474 },
475 };
476
477 static const struct sparc_pmu niagara2_pmu = {
478 .event_map = niagara2_event_map,
479 .cache_map = &niagara2_cache_map,
480 .max_events = ARRAY_SIZE(niagara2_perfmon_event_map),
481 .upper_shift = 19,
482 .lower_shift = 6,
483 .event_mask = 0xfff,
484 .hv_bit = 0x8,
485 .irq_bit = 0x30,
486 .upper_nop = 0x220,
487 .lower_nop = 0x220,
488 };
489
490 static const struct sparc_pmu *sparc_pmu __read_mostly;
491
492 static u64 event_encoding(u64 event_id, int idx)
493 {
494 if (idx == PIC_UPPER_INDEX)
495 event_id <<= sparc_pmu->upper_shift;
496 else
497 event_id <<= sparc_pmu->lower_shift;
498 return event_id;
499 }
500
501 static u64 mask_for_index(int idx)
502 {
503 return event_encoding(sparc_pmu->event_mask, idx);
504 }
505
506 static u64 nop_for_index(int idx)
507 {
508 return event_encoding(idx == PIC_UPPER_INDEX ?
509 sparc_pmu->upper_nop :
510 sparc_pmu->lower_nop, idx);
511 }
512
513 static inline void sparc_pmu_enable_event(struct cpu_hw_events *cpuc, struct hw_perf_event *hwc, int idx)
514 {
515 u64 val, mask = mask_for_index(idx);
516
517 val = cpuc->pcr;
518 val &= ~mask;
519 val |= hwc->config;
520 cpuc->pcr = val;
521
522 pcr_ops->write(cpuc->pcr);
523 }
524
525 static inline void sparc_pmu_disable_event(struct cpu_hw_events *cpuc, struct hw_perf_event *hwc, int idx)
526 {
527 u64 mask = mask_for_index(idx);
528 u64 nop = nop_for_index(idx);
529 u64 val;
530
531 val = cpuc->pcr;
532 val &= ~mask;
533 val |= nop;
534 cpuc->pcr = val;
535
536 pcr_ops->write(cpuc->pcr);
537 }
538
539 static u32 read_pmc(int idx)
540 {
541 u64 val;
542
543 read_pic(val);
544 if (idx == PIC_UPPER_INDEX)
545 val >>= 32;
546
547 return val & 0xffffffff;
548 }
549
550 static void write_pmc(int idx, u64 val)
551 {
552 u64 shift, mask, pic;
553
554 shift = 0;
555 if (idx == PIC_UPPER_INDEX)
556 shift = 32;
557
558 mask = ((u64) 0xffffffff) << shift;
559 val <<= shift;
560
561 read_pic(pic);
562 pic &= ~mask;
563 pic |= val;
564 write_pic(pic);
565 }
566
567 static u64 sparc_perf_event_update(struct perf_event *event,
568 struct hw_perf_event *hwc, int idx)
569 {
570 int shift = 64 - 32;
571 u64 prev_raw_count, new_raw_count;
572 s64 delta;
573
574 again:
575 prev_raw_count = local64_read(&hwc->prev_count);
576 new_raw_count = read_pmc(idx);
577
578 if (local64_cmpxchg(&hwc->prev_count, prev_raw_count,
579 new_raw_count) != prev_raw_count)
580 goto again;
581
582 delta = (new_raw_count << shift) - (prev_raw_count << shift);
583 delta >>= shift;
584
585 local64_add(delta, &event->count);
586 local64_sub(delta, &hwc->period_left);
587
588 return new_raw_count;
589 }
590
591 static int sparc_perf_event_set_period(struct perf_event *event,
592 struct hw_perf_event *hwc, int idx)
593 {
594 s64 left = local64_read(&hwc->period_left);
595 s64 period = hwc->sample_period;
596 int ret = 0;
597
598 if (unlikely(left <= -period)) {
599 left = period;
600 local64_set(&hwc->period_left, left);
601 hwc->last_period = period;
602 ret = 1;
603 }
604
605 if (unlikely(left <= 0)) {
606 left += period;
607 local64_set(&hwc->period_left, left);
608 hwc->last_period = period;
609 ret = 1;
610 }
611 if (left > MAX_PERIOD)
612 left = MAX_PERIOD;
613
614 local64_set(&hwc->prev_count, (u64)-left);
615
616 write_pmc(idx, (u64)(-left) & 0xffffffff);
617
618 perf_event_update_userpage(event);
619
620 return ret;
621 }
622
623 /* If performance event entries have been added, move existing
624 * events around (if necessary) and then assign new entries to
625 * counters.
626 */
627 static u64 maybe_change_configuration(struct cpu_hw_events *cpuc, u64 pcr)
628 {
629 int i;
630
631 if (!cpuc->n_added)
632 goto out;
633
634 /* Read in the counters which are moving. */
635 for (i = 0; i < cpuc->n_events; i++) {
636 struct perf_event *cp = cpuc->event[i];
637
638 if (cpuc->current_idx[i] != PIC_NO_INDEX &&
639 cpuc->current_idx[i] != cp->hw.idx) {
640 sparc_perf_event_update(cp, &cp->hw,
641 cpuc->current_idx[i]);
642 cpuc->current_idx[i] = PIC_NO_INDEX;
643 }
644 }
645
646 /* Assign to counters all unassigned events. */
647 for (i = 0; i < cpuc->n_events; i++) {
648 struct perf_event *cp = cpuc->event[i];
649 struct hw_perf_event *hwc = &cp->hw;
650 int idx = hwc->idx;
651 u64 enc;
652
653 if (cpuc->current_idx[i] != PIC_NO_INDEX)
654 continue;
655
656 sparc_perf_event_set_period(cp, hwc, idx);
657 cpuc->current_idx[i] = idx;
658
659 enc = perf_event_get_enc(cpuc->events[i]);
660 pcr &= ~mask_for_index(idx);
661 pcr |= event_encoding(enc, idx);
662 }
663 out:
664 return pcr;
665 }
666
667 void hw_perf_enable(void)
668 {
669 struct cpu_hw_events *cpuc = &__get_cpu_var(cpu_hw_events);
670 u64 pcr;
671
672 if (cpuc->enabled)
673 return;
674
675 cpuc->enabled = 1;
676 barrier();
677
678 pcr = cpuc->pcr;
679 if (!cpuc->n_events) {
680 pcr = 0;
681 } else {
682 pcr = maybe_change_configuration(cpuc, pcr);
683
684 /* We require that all of the events have the same
685 * configuration, so just fetch the settings from the
686 * first entry.
687 */
688 cpuc->pcr = pcr | cpuc->event[0]->hw.config_base;
689 }
690
691 pcr_ops->write(cpuc->pcr);
692 }
693
694 void hw_perf_disable(void)
695 {
696 struct cpu_hw_events *cpuc = &__get_cpu_var(cpu_hw_events);
697 u64 val;
698
699 if (!cpuc->enabled)
700 return;
701
702 cpuc->enabled = 0;
703 cpuc->n_added = 0;
704
705 val = cpuc->pcr;
706 val &= ~(PCR_UTRACE | PCR_STRACE |
707 sparc_pmu->hv_bit | sparc_pmu->irq_bit);
708 cpuc->pcr = val;
709
710 pcr_ops->write(cpuc->pcr);
711 }
712
713 static void sparc_pmu_disable(struct perf_event *event)
714 {
715 struct cpu_hw_events *cpuc = &__get_cpu_var(cpu_hw_events);
716 struct hw_perf_event *hwc = &event->hw;
717 unsigned long flags;
718 int i;
719
720 local_irq_save(flags);
721 perf_disable();
722
723 for (i = 0; i < cpuc->n_events; i++) {
724 if (event == cpuc->event[i]) {
725 int idx = cpuc->current_idx[i];
726
727 /* Shift remaining entries down into
728 * the existing slot.
729 */
730 while (++i < cpuc->n_events) {
731 cpuc->event[i - 1] = cpuc->event[i];
732 cpuc->events[i - 1] = cpuc->events[i];
733 cpuc->current_idx[i - 1] =
734 cpuc->current_idx[i];
735 }
736
737 /* Absorb the final count and turn off the
738 * event.
739 */
740 sparc_pmu_disable_event(cpuc, hwc, idx);
741 barrier();
742 sparc_perf_event_update(event, hwc, idx);
743
744 perf_event_update_userpage(event);
745
746 cpuc->n_events--;
747 break;
748 }
749 }
750
751 perf_enable();
752 local_irq_restore(flags);
753 }
754
755 static int active_event_index(struct cpu_hw_events *cpuc,
756 struct perf_event *event)
757 {
758 int i;
759
760 for (i = 0; i < cpuc->n_events; i++) {
761 if (cpuc->event[i] == event)
762 break;
763 }
764 BUG_ON(i == cpuc->n_events);
765 return cpuc->current_idx[i];
766 }
767
768 static void sparc_pmu_read(struct perf_event *event)
769 {
770 struct cpu_hw_events *cpuc = &__get_cpu_var(cpu_hw_events);
771 int idx = active_event_index(cpuc, event);
772 struct hw_perf_event *hwc = &event->hw;
773
774 sparc_perf_event_update(event, hwc, idx);
775 }
776
777 static void sparc_pmu_unthrottle(struct perf_event *event)
778 {
779 struct cpu_hw_events *cpuc = &__get_cpu_var(cpu_hw_events);
780 int idx = active_event_index(cpuc, event);
781 struct hw_perf_event *hwc = &event->hw;
782
783 sparc_pmu_enable_event(cpuc, hwc, idx);
784 }
785
786 static atomic_t active_events = ATOMIC_INIT(0);
787 static DEFINE_MUTEX(pmc_grab_mutex);
788
789 static void perf_stop_nmi_watchdog(void *unused)
790 {
791 struct cpu_hw_events *cpuc = &__get_cpu_var(cpu_hw_events);
792
793 stop_nmi_watchdog(NULL);
794 cpuc->pcr = pcr_ops->read();
795 }
796
797 void perf_event_grab_pmc(void)
798 {
799 if (atomic_inc_not_zero(&active_events))
800 return;
801
802 mutex_lock(&pmc_grab_mutex);
803 if (atomic_read(&active_events) == 0) {
804 if (atomic_read(&nmi_active) > 0) {
805 on_each_cpu(perf_stop_nmi_watchdog, NULL, 1);
806 BUG_ON(atomic_read(&nmi_active) != 0);
807 }
808 atomic_inc(&active_events);
809 }
810 mutex_unlock(&pmc_grab_mutex);
811 }
812
813 void perf_event_release_pmc(void)
814 {
815 if (atomic_dec_and_mutex_lock(&active_events, &pmc_grab_mutex)) {
816 if (atomic_read(&nmi_active) == 0)
817 on_each_cpu(start_nmi_watchdog, NULL, 1);
818 mutex_unlock(&pmc_grab_mutex);
819 }
820 }
821
822 static const struct perf_event_map *sparc_map_cache_event(u64 config)
823 {
824 unsigned int cache_type, cache_op, cache_result;
825 const struct perf_event_map *pmap;
826
827 if (!sparc_pmu->cache_map)
828 return ERR_PTR(-ENOENT);
829
830 cache_type = (config >> 0) & 0xff;
831 if (cache_type >= PERF_COUNT_HW_CACHE_MAX)
832 return ERR_PTR(-EINVAL);
833
834 cache_op = (config >> 8) & 0xff;
835 if (cache_op >= PERF_COUNT_HW_CACHE_OP_MAX)
836 return ERR_PTR(-EINVAL);
837
838 cache_result = (config >> 16) & 0xff;
839 if (cache_result >= PERF_COUNT_HW_CACHE_RESULT_MAX)
840 return ERR_PTR(-EINVAL);
841
842 pmap = &((*sparc_pmu->cache_map)[cache_type][cache_op][cache_result]);
843
844 if (pmap->encoding == CACHE_OP_UNSUPPORTED)
845 return ERR_PTR(-ENOENT);
846
847 if (pmap->encoding == CACHE_OP_NONSENSE)
848 return ERR_PTR(-EINVAL);
849
850 return pmap;
851 }
852
853 static void hw_perf_event_destroy(struct perf_event *event)
854 {
855 perf_event_release_pmc();
856 }
857
858 /* Make sure all events can be scheduled into the hardware at
859 * the same time. This is simplified by the fact that we only
860 * need to support 2 simultaneous HW events.
861 *
862 * As a side effect, the evts[]->hw.idx values will be assigned
863 * on success. These are pending indexes. When the events are
864 * actually programmed into the chip, these values will propagate
865 * to the per-cpu cpuc->current_idx[] slots, see the code in
866 * maybe_change_configuration() for details.
867 */
868 static int sparc_check_constraints(struct perf_event **evts,
869 unsigned long *events, int n_ev)
870 {
871 u8 msk0 = 0, msk1 = 0;
872 int idx0 = 0;
873
874 /* This case is possible when we are invoked from
875 * hw_perf_group_sched_in().
876 */
877 if (!n_ev)
878 return 0;
879
880 if (n_ev > perf_max_events)
881 return -1;
882
883 msk0 = perf_event_get_msk(events[0]);
884 if (n_ev == 1) {
885 if (msk0 & PIC_LOWER)
886 idx0 = 1;
887 goto success;
888 }
889 BUG_ON(n_ev != 2);
890 msk1 = perf_event_get_msk(events[1]);
891
892 /* If both events can go on any counter, OK. */
893 if (msk0 == (PIC_UPPER | PIC_LOWER) &&
894 msk1 == (PIC_UPPER | PIC_LOWER))
895 goto success;
896
897 /* If one event is limited to a specific counter,
898 * and the other can go on both, OK.
899 */
900 if ((msk0 == PIC_UPPER || msk0 == PIC_LOWER) &&
901 msk1 == (PIC_UPPER | PIC_LOWER)) {
902 if (msk0 & PIC_LOWER)
903 idx0 = 1;
904 goto success;
905 }
906
907 if ((msk1 == PIC_UPPER || msk1 == PIC_LOWER) &&
908 msk0 == (PIC_UPPER | PIC_LOWER)) {
909 if (msk1 & PIC_UPPER)
910 idx0 = 1;
911 goto success;
912 }
913
914 /* If the events are fixed to different counters, OK. */
915 if ((msk0 == PIC_UPPER && msk1 == PIC_LOWER) ||
916 (msk0 == PIC_LOWER && msk1 == PIC_UPPER)) {
917 if (msk0 & PIC_LOWER)
918 idx0 = 1;
919 goto success;
920 }
921
922 /* Otherwise, there is a conflict. */
923 return -1;
924
925 success:
926 evts[0]->hw.idx = idx0;
927 if (n_ev == 2)
928 evts[1]->hw.idx = idx0 ^ 1;
929 return 0;
930 }
931
932 static int check_excludes(struct perf_event **evts, int n_prev, int n_new)
933 {
934 int eu = 0, ek = 0, eh = 0;
935 struct perf_event *event;
936 int i, n, first;
937
938 n = n_prev + n_new;
939 if (n <= 1)
940 return 0;
941
942 first = 1;
943 for (i = 0; i < n; i++) {
944 event = evts[i];
945 if (first) {
946 eu = event->attr.exclude_user;
947 ek = event->attr.exclude_kernel;
948 eh = event->attr.exclude_hv;
949 first = 0;
950 } else if (event->attr.exclude_user != eu ||
951 event->attr.exclude_kernel != ek ||
952 event->attr.exclude_hv != eh) {
953 return -EAGAIN;
954 }
955 }
956
957 return 0;
958 }
959
960 static int collect_events(struct perf_event *group, int max_count,
961 struct perf_event *evts[], unsigned long *events,
962 int *current_idx)
963 {
964 struct perf_event *event;
965 int n = 0;
966
967 if (!is_software_event(group)) {
968 if (n >= max_count)
969 return -1;
970 evts[n] = group;
971 events[n] = group->hw.event_base;
972 current_idx[n++] = PIC_NO_INDEX;
973 }
974 list_for_each_entry(event, &group->sibling_list, group_entry) {
975 if (!is_software_event(event) &&
976 event->state != PERF_EVENT_STATE_OFF) {
977 if (n >= max_count)
978 return -1;
979 evts[n] = event;
980 events[n] = event->hw.event_base;
981 current_idx[n++] = PIC_NO_INDEX;
982 }
983 }
984 return n;
985 }
986
987 static int sparc_pmu_enable(struct perf_event *event)
988 {
989 struct cpu_hw_events *cpuc = &__get_cpu_var(cpu_hw_events);
990 int n0, ret = -EAGAIN;
991 unsigned long flags;
992
993 local_irq_save(flags);
994 perf_disable();
995
996 n0 = cpuc->n_events;
997 if (n0 >= perf_max_events)
998 goto out;
999
1000 cpuc->event[n0] = event;
1001 cpuc->events[n0] = event->hw.event_base;
1002 cpuc->current_idx[n0] = PIC_NO_INDEX;
1003
1004 /*
1005 * If group events scheduling transaction was started,
1006 * skip the schedulability test here, it will be peformed
1007 * at commit time(->commit_txn) as a whole
1008 */
1009 if (cpuc->group_flag & PERF_EVENT_TXN)
1010 goto nocheck;
1011
1012 if (check_excludes(cpuc->event, n0, 1))
1013 goto out;
1014 if (sparc_check_constraints(cpuc->event, cpuc->events, n0 + 1))
1015 goto out;
1016
1017 nocheck:
1018 cpuc->n_events++;
1019 cpuc->n_added++;
1020
1021 ret = 0;
1022 out:
1023 perf_enable();
1024 local_irq_restore(flags);
1025 return ret;
1026 }
1027
1028 static int __hw_perf_event_init(struct perf_event *event)
1029 {
1030 struct perf_event_attr *attr = &event->attr;
1031 struct perf_event *evts[MAX_HWEVENTS];
1032 struct hw_perf_event *hwc = &event->hw;
1033 unsigned long events[MAX_HWEVENTS];
1034 int current_idx_dmy[MAX_HWEVENTS];
1035 const struct perf_event_map *pmap;
1036 int n;
1037
1038 if (atomic_read(&nmi_active) < 0)
1039 return -ENODEV;
1040
1041 if (attr->type == PERF_TYPE_HARDWARE) {
1042 if (attr->config >= sparc_pmu->max_events)
1043 return -EINVAL;
1044 pmap = sparc_pmu->event_map(attr->config);
1045 } else if (attr->type == PERF_TYPE_HW_CACHE) {
1046 pmap = sparc_map_cache_event(attr->config);
1047 if (IS_ERR(pmap))
1048 return PTR_ERR(pmap);
1049 } else
1050 return -EOPNOTSUPP;
1051
1052 /* We save the enable bits in the config_base. */
1053 hwc->config_base = sparc_pmu->irq_bit;
1054 if (!attr->exclude_user)
1055 hwc->config_base |= PCR_UTRACE;
1056 if (!attr->exclude_kernel)
1057 hwc->config_base |= PCR_STRACE;
1058 if (!attr->exclude_hv)
1059 hwc->config_base |= sparc_pmu->hv_bit;
1060
1061 hwc->event_base = perf_event_encode(pmap);
1062
1063 n = 0;
1064 if (event->group_leader != event) {
1065 n = collect_events(event->group_leader,
1066 perf_max_events - 1,
1067 evts, events, current_idx_dmy);
1068 if (n < 0)
1069 return -EINVAL;
1070 }
1071 events[n] = hwc->event_base;
1072 evts[n] = event;
1073
1074 if (check_excludes(evts, n, 1))
1075 return -EINVAL;
1076
1077 if (sparc_check_constraints(evts, events, n + 1))
1078 return -EINVAL;
1079
1080 hwc->idx = PIC_NO_INDEX;
1081
1082 /* Try to do all error checking before this point, as unwinding
1083 * state after grabbing the PMC is difficult.
1084 */
1085 perf_event_grab_pmc();
1086 event->destroy = hw_perf_event_destroy;
1087
1088 if (!hwc->sample_period) {
1089 hwc->sample_period = MAX_PERIOD;
1090 hwc->last_period = hwc->sample_period;
1091 local64_set(&hwc->period_left, hwc->sample_period);
1092 }
1093
1094 return 0;
1095 }
1096
1097 /*
1098 * Start group events scheduling transaction
1099 * Set the flag to make pmu::enable() not perform the
1100 * schedulability test, it will be performed at commit time
1101 */
1102 static void sparc_pmu_start_txn(const struct pmu *pmu)
1103 {
1104 struct cpu_hw_events *cpuhw = &__get_cpu_var(cpu_hw_events);
1105
1106 cpuhw->group_flag |= PERF_EVENT_TXN;
1107 }
1108
1109 /*
1110 * Stop group events scheduling transaction
1111 * Clear the flag and pmu::enable() will perform the
1112 * schedulability test.
1113 */
1114 static void sparc_pmu_cancel_txn(const struct pmu *pmu)
1115 {
1116 struct cpu_hw_events *cpuhw = &__get_cpu_var(cpu_hw_events);
1117
1118 cpuhw->group_flag &= ~PERF_EVENT_TXN;
1119 }
1120
1121 /*
1122 * Commit group events scheduling transaction
1123 * Perform the group schedulability test as a whole
1124 * Return 0 if success
1125 */
1126 static int sparc_pmu_commit_txn(const struct pmu *pmu)
1127 {
1128 struct cpu_hw_events *cpuc = &__get_cpu_var(cpu_hw_events);
1129 int n;
1130
1131 if (!sparc_pmu)
1132 return -EINVAL;
1133
1134 cpuc = &__get_cpu_var(cpu_hw_events);
1135 n = cpuc->n_events;
1136 if (check_excludes(cpuc->event, 0, n))
1137 return -EINVAL;
1138 if (sparc_check_constraints(cpuc->event, cpuc->events, n))
1139 return -EAGAIN;
1140
1141 cpuc->group_flag &= ~PERF_EVENT_TXN;
1142 return 0;
1143 }
1144
1145 static const struct pmu pmu = {
1146 .enable = sparc_pmu_enable,
1147 .disable = sparc_pmu_disable,
1148 .read = sparc_pmu_read,
1149 .unthrottle = sparc_pmu_unthrottle,
1150 .start_txn = sparc_pmu_start_txn,
1151 .cancel_txn = sparc_pmu_cancel_txn,
1152 .commit_txn = sparc_pmu_commit_txn,
1153 };
1154
1155 const struct pmu *hw_perf_event_init(struct perf_event *event)
1156 {
1157 int err = __hw_perf_event_init(event);
1158
1159 if (err)
1160 return ERR_PTR(err);
1161 return &pmu;
1162 }
1163
1164 void perf_event_print_debug(void)
1165 {
1166 unsigned long flags;
1167 u64 pcr, pic;
1168 int cpu;
1169
1170 if (!sparc_pmu)
1171 return;
1172
1173 local_irq_save(flags);
1174
1175 cpu = smp_processor_id();
1176
1177 pcr = pcr_ops->read();
1178 read_pic(pic);
1179
1180 pr_info("\n");
1181 pr_info("CPU#%d: PCR[%016llx] PIC[%016llx]\n",
1182 cpu, pcr, pic);
1183
1184 local_irq_restore(flags);
1185 }
1186
1187 static int __kprobes perf_event_nmi_handler(struct notifier_block *self,
1188 unsigned long cmd, void *__args)
1189 {
1190 struct die_args *args = __args;
1191 struct perf_sample_data data;
1192 struct cpu_hw_events *cpuc;
1193 struct pt_regs *regs;
1194 int i;
1195
1196 if (!atomic_read(&active_events))
1197 return NOTIFY_DONE;
1198
1199 switch (cmd) {
1200 case DIE_NMI:
1201 break;
1202
1203 default:
1204 return NOTIFY_DONE;
1205 }
1206
1207 regs = args->regs;
1208
1209 perf_sample_data_init(&data, 0);
1210
1211 cpuc = &__get_cpu_var(cpu_hw_events);
1212
1213 /* If the PMU has the TOE IRQ enable bits, we need to do a
1214 * dummy write to the %pcr to clear the overflow bits and thus
1215 * the interrupt.
1216 *
1217 * Do this before we peek at the counters to determine
1218 * overflow so we don't lose any events.
1219 */
1220 if (sparc_pmu->irq_bit)
1221 pcr_ops->write(cpuc->pcr);
1222
1223 for (i = 0; i < cpuc->n_events; i++) {
1224 struct perf_event *event = cpuc->event[i];
1225 int idx = cpuc->current_idx[i];
1226 struct hw_perf_event *hwc;
1227 u64 val;
1228
1229 hwc = &event->hw;
1230 val = sparc_perf_event_update(event, hwc, idx);
1231 if (val & (1ULL << 31))
1232 continue;
1233
1234 data.period = event->hw.last_period;
1235 if (!sparc_perf_event_set_period(event, hwc, idx))
1236 continue;
1237
1238 if (perf_event_overflow(event, 1, &data, regs))
1239 sparc_pmu_disable_event(cpuc, hwc, idx);
1240 }
1241
1242 return NOTIFY_STOP;
1243 }
1244
1245 static __read_mostly struct notifier_block perf_event_nmi_notifier = {
1246 .notifier_call = perf_event_nmi_handler,
1247 };
1248
1249 static bool __init supported_pmu(void)
1250 {
1251 if (!strcmp(sparc_pmu_type, "ultra3") ||
1252 !strcmp(sparc_pmu_type, "ultra3+") ||
1253 !strcmp(sparc_pmu_type, "ultra3i") ||
1254 !strcmp(sparc_pmu_type, "ultra4+")) {
1255 sparc_pmu = &ultra3_pmu;
1256 return true;
1257 }
1258 if (!strcmp(sparc_pmu_type, "niagara")) {
1259 sparc_pmu = &niagara1_pmu;
1260 return true;
1261 }
1262 if (!strcmp(sparc_pmu_type, "niagara2")) {
1263 sparc_pmu = &niagara2_pmu;
1264 return true;
1265 }
1266 return false;
1267 }
1268
1269 void __init init_hw_perf_events(void)
1270 {
1271 pr_info("Performance events: ");
1272
1273 if (!supported_pmu()) {
1274 pr_cont("No support for PMU type '%s'\n", sparc_pmu_type);
1275 return;
1276 }
1277
1278 pr_cont("Supported PMU type is '%s'\n", sparc_pmu_type);
1279
1280 /* All sparc64 PMUs currently have 2 events. */
1281 perf_max_events = 2;
1282
1283 register_die_notifier(&perf_event_nmi_notifier);
1284 }
1285
1286 static void perf_callchain_kernel(struct pt_regs *regs,
1287 struct perf_callchain_entry *entry)
1288 {
1289 unsigned long ksp, fp;
1290 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
1291 int graph = 0;
1292 #endif
1293
1294 perf_callchain_store(entry, PERF_CONTEXT_KERNEL);
1295 perf_callchain_store(entry, regs->tpc);
1296
1297 ksp = regs->u_regs[UREG_I6];
1298 fp = ksp + STACK_BIAS;
1299 do {
1300 struct sparc_stackf *sf;
1301 struct pt_regs *regs;
1302 unsigned long pc;
1303
1304 if (!kstack_valid(current_thread_info(), fp))
1305 break;
1306
1307 sf = (struct sparc_stackf *) fp;
1308 regs = (struct pt_regs *) (sf + 1);
1309
1310 if (kstack_is_trap_frame(current_thread_info(), regs)) {
1311 if (user_mode(regs))
1312 break;
1313 pc = regs->tpc;
1314 fp = regs->u_regs[UREG_I6] + STACK_BIAS;
1315 } else {
1316 pc = sf->callers_pc;
1317 fp = (unsigned long)sf->fp + STACK_BIAS;
1318 }
1319 perf_callchain_store(entry, pc);
1320 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
1321 if ((pc + 8UL) == (unsigned long) &return_to_handler) {
1322 int index = current->curr_ret_stack;
1323 if (current->ret_stack && index >= graph) {
1324 pc = current->ret_stack[index - graph].ret;
1325 perf_callchain_store(entry, pc);
1326 graph++;
1327 }
1328 }
1329 #endif
1330 } while (entry->nr < PERF_MAX_STACK_DEPTH);
1331 }
1332
1333 static void perf_callchain_user_64(struct pt_regs *regs,
1334 struct perf_callchain_entry *entry)
1335 {
1336 unsigned long ufp;
1337
1338 perf_callchain_store(entry, PERF_CONTEXT_USER);
1339 perf_callchain_store(entry, regs->tpc);
1340
1341 ufp = regs->u_regs[UREG_I6] + STACK_BIAS;
1342 do {
1343 struct sparc_stackf *usf, sf;
1344 unsigned long pc;
1345
1346 usf = (struct sparc_stackf *) ufp;
1347 if (__copy_from_user_inatomic(&sf, usf, sizeof(sf)))
1348 break;
1349
1350 pc = sf.callers_pc;
1351 ufp = (unsigned long)sf.fp + STACK_BIAS;
1352 perf_callchain_store(entry, pc);
1353 } while (entry->nr < PERF_MAX_STACK_DEPTH);
1354 }
1355
1356 static void perf_callchain_user_32(struct pt_regs *regs,
1357 struct perf_callchain_entry *entry)
1358 {
1359 unsigned long ufp;
1360
1361 perf_callchain_store(entry, PERF_CONTEXT_USER);
1362 perf_callchain_store(entry, regs->tpc);
1363
1364 ufp = regs->u_regs[UREG_I6] & 0xffffffffUL;
1365 do {
1366 struct sparc_stackf32 *usf, sf;
1367 unsigned long pc;
1368
1369 usf = (struct sparc_stackf32 *) ufp;
1370 if (__copy_from_user_inatomic(&sf, usf, sizeof(sf)))
1371 break;
1372
1373 pc = sf.callers_pc;
1374 ufp = (unsigned long)sf.fp;
1375 perf_callchain_store(entry, pc);
1376 } while (entry->nr < PERF_MAX_STACK_DEPTH);
1377 }
1378
1379 /* Like powerpc we can't get PMU interrupts within the PMU handler,
1380 * so no need for separate NMI and IRQ chains as on x86.
1381 */
1382 static DEFINE_PER_CPU(struct perf_callchain_entry, callchain);
1383
1384 struct perf_callchain_entry *perf_callchain(struct pt_regs *regs)
1385 {
1386 struct perf_callchain_entry *entry = &__get_cpu_var(callchain);
1387
1388 entry->nr = 0;
1389 if (!user_mode(regs)) {
1390 stack_trace_flush();
1391 perf_callchain_kernel(regs, entry);
1392 if (current->mm)
1393 regs = task_pt_regs(current);
1394 else
1395 regs = NULL;
1396 }
1397 if (regs) {
1398 flushw_user();
1399 if (test_thread_flag(TIF_32BIT))
1400 perf_callchain_user_32(regs, entry);
1401 else
1402 perf_callchain_user_64(regs, entry);
1403 }
1404 return entry;
1405 }
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree