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avr32: Replace __get_cpu_var with __this_cpu_write
[linux-2.6-block.git] / arch / sparc / kernel / perf_event.c
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cdd6c482 1/* Performance event support for sparc64.
59abbd1e 2 *
4f6dbe4a 3 * Copyright (C) 2009, 2010 David S. Miller <davem@davemloft.net>
59abbd1e 4 *
cdd6c482 5 * This code is based almost entirely upon the x86 perf event
59abbd1e
DM		 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
cdd6c482 15#include <linux/perf_event.h>
59abbd1e 16#include <linux/kprobes.h>
667f0cee 17#include <linux/ftrace.h>
59abbd1e
DM		 18#include <linux/kernel.h>
19#include <linux/kdebug.h>
20#include <linux/mutex.h>
21
4f6dbe4a 22#include <asm/stacktrace.h>
59abbd1e 23#include <asm/cpudata.h>
4f6dbe4a 24#include <asm/uaccess.h>
60063497 25#include <linux/atomic.h>
59abbd1e
DM		 26#include <asm/nmi.h>
27#include <asm/pcr.h>
d550bbd4 28#include <asm/cacheflush.h>
59abbd1e 29
cb1b8209 30#include "kernel.h"
4f6dbe4a
DM		 31#include "kstack.h"
32
bab96bda
DM		 33/* Two classes of sparc64 chips currently exist. All of which have
34 * 32-bit counters which can generate overflow interrupts on the
35 * transition from 0xffffffff to 0.
59abbd1e 36 *
bab96bda
DM		 37 * All chips upto and including SPARC-T3 have two performance
38 * counters. The two 32-bit counters are accessed in one go using a
39 * single 64-bit register.
59abbd1e 40 *
bab96bda
DM		 41 * On these older chips both counters are controlled using a single
42 * control register. The only way to stop all sampling is to clear
43 * all of the context (user, supervisor, hypervisor) sampling enable
44 * bits. But these bits apply to both counters, thus the two counters
45 * can't be enabled/disabled individually.
46 *
47 * Furthermore, the control register on these older chips have two
48 * event fields, one for each of the two counters. It's thus nearly
49 * impossible to have one counter going while keeping the other one
50 * stopped. Therefore it is possible to get overflow interrupts for
51 * counters not currently "in use" and that condition must be checked
52 * in the overflow interrupt handler.
59abbd1e
DM		 53 *
54 * So we use a hack, in that we program inactive counters with the
55 * "sw_count0" and "sw_count1" events. These count how many times
56 * the instruction "sethi %hi(0xfc000), %g0" is executed. It's an
57 * unusual way to encode a NOP and therefore will not trigger in
58 * normal code.
bab96bda
DM		 59 *
60 * Starting with SPARC-T4 we have one control register per counter.
61 * And the counters are stored in individual registers. The registers
62 * for the counters are 64-bit but only a 32-bit counter is
63 * implemented. The event selections on SPARC-T4 lack any
64 * restrictions, therefore we can elide all of the complicated
65 * conflict resolution code we have for SPARC-T3 and earlier chips.
59abbd1e
DM		 66 */
67
035ea28d
DM		 68#define MAX_HWEVENTS 4
69#define MAX_PCRS 4
59abbd1e
DM		 70#define MAX_PERIOD ((1UL << 32) - 1)
71
72#define PIC_UPPER_INDEX 0
73#define PIC_LOWER_INDEX 1
e7bef6b0 74#define PIC_NO_INDEX -1
59abbd1e 75
cdd6c482 76struct cpu_hw_events {
e7bef6b0
DM		 77 /* Number of events currently scheduled onto this cpu.
78 * This tells how many entries in the arrays below
79 * are valid.
80 */
81 int n_events;
82
83 /* Number of new events added since the last hw_perf_disable().
84 * This works because the perf event layer always adds new
85 * events inside of a perf_{disable,enable}() sequence.
86 */
87 int n_added;
88
89 /* Array of events current scheduled on this cpu. */
90 struct perf_event *event[MAX_HWEVENTS];
91
92 /* Array of encoded longs, specifying the %pcr register
93 * encoding and the mask of PIC counters this even can
94 * be scheduled on. See perf_event_encode() et al.
95 */
96 unsigned long events[MAX_HWEVENTS];
97
98 /* The current counter index assigned to an event. When the
99 * event hasn't been programmed into the cpu yet, this will
100 * hold PIC_NO_INDEX. The event->hw.idx value tells us where
101 * we ought to schedule the event.
102 */
103 int current_idx[MAX_HWEVENTS];
104
3f1a2097
DM		 105 /* Software copy of %pcr register(s) on this cpu. */
106 u64 pcr[MAX_HWEVENTS];
e7bef6b0
DM		 107
108 /* Enabled/disable state. */
d1751388 109 int enabled;
a13c3afd
LM		 110
111 unsigned int group_flag;
59abbd1e 112};
265c1ffa 113static DEFINE_PER_CPU(struct cpu_hw_events, cpu_hw_events) = { .enabled = 1, };
59abbd1e 114
e7bef6b0
DM		 115/* An event map describes the characteristics of a performance
116 * counter event. In particular it gives the encoding as well as
117 * a mask telling which counters the event can be measured on.
bab96bda
DM		 118 *
119 * The mask is unused on SPARC-T4 and later.
e7bef6b0 120 */
59abbd1e
DM		 121struct perf_event_map {
122 u16 encoding;
123 u8 pic_mask;
124#define PIC_NONE 0x00
125#define PIC_UPPER 0x01
126#define PIC_LOWER 0x02
127};
128
e7bef6b0 129/* Encode a perf_event_map entry into a long. */
a72a8a5f
DM		 130static unsigned long perf_event_encode(const struct perf_event_map *pmap)
131{
132 return ((unsigned long) pmap->encoding << 16) | pmap->pic_mask;
133}
134
e7bef6b0
DM		 135static u8 perf_event_get_msk(unsigned long val)
136{
137 return val & 0xff;
138}
139
140static u64 perf_event_get_enc(unsigned long val)
a72a8a5f 141{
e7bef6b0 142 return val >> 16;
a72a8a5f
DM		 143}
144
2ce4da2e
DM		 145#define C(x) PERF_COUNT_HW_CACHE_##x
146
147#define CACHE_OP_UNSUPPORTED 0xfffe
148#define CACHE_OP_NONSENSE 0xffff
149
150typedef struct perf_event_map cache_map_t
151 [PERF_COUNT_HW_CACHE_MAX]
152 [PERF_COUNT_HW_CACHE_OP_MAX]
153 [PERF_COUNT_HW_CACHE_RESULT_MAX];
154
59abbd1e
DM		 155struct sparc_pmu {
156 const struct perf_event_map *(*event_map)(int);
2ce4da2e 157 const cache_map_t *cache_map;
59abbd1e 158 int max_events;
5344303c
DM		 159 u32 (*read_pmc)(int);
160 void (*write_pmc)(int, u64);
59abbd1e
DM		 161 int upper_shift;
162 int lower_shift;
163 int event_mask;
7ac2ed28
DM		 164 int user_bit;
165 int priv_bit;
91b9286d 166 int hv_bit;
496c07e3 167 int irq_bit;
660d1376
DM		 168 int upper_nop;
169 int lower_nop;
b38e99f5
DM		 170 unsigned int flags;
171#define SPARC_PMU_ALL_EXCLUDES_SAME 0x00000001
172#define SPARC_PMU_HAS_CONFLICTS 0x00000002
59660495 173 int max_hw_events;
3f1a2097
DM		 174 int num_pcrs;
175 int num_pic_regs;
59abbd1e
DM		 176};
177
5344303c
DM		 178static u32 sparc_default_read_pmc(int idx)
179{
180 u64 val;
181
182 val = pcr_ops->read_pic(0);
183 if (idx == PIC_UPPER_INDEX)
184 val >>= 32;
185
186 return val & 0xffffffff;
187}
188
189static void sparc_default_write_pmc(int idx, u64 val)
190{
191 u64 shift, mask, pic;
192
193 shift = 0;
194 if (idx == PIC_UPPER_INDEX)
195 shift = 32;
196
197 mask = ((u64) 0xffffffff) << shift;
198 val <<= shift;
199
200 pic = pcr_ops->read_pic(0);
201 pic &= ~mask;
202 pic |= val;
203 pcr_ops->write_pic(0, pic);
204}
205
28e8f9be 206static const struct perf_event_map ultra3_perfmon_event_map[] = {
59abbd1e
DM		 207 [PERF_COUNT_HW_CPU_CYCLES] = { 0x0000, PIC_UPPER | PIC_LOWER },
208 [PERF_COUNT_HW_INSTRUCTIONS] = { 0x0001, PIC_UPPER | PIC_LOWER },
209 [PERF_COUNT_HW_CACHE_REFERENCES] = { 0x0009, PIC_LOWER },
210 [PERF_COUNT_HW_CACHE_MISSES] = { 0x0009, PIC_UPPER },
211};
212
28e8f9be 213static const struct perf_event_map *ultra3_event_map(int event_id)
59abbd1e 214{
28e8f9be 215 return &ultra3_perfmon_event_map[event_id];
59abbd1e
DM		 216}
217
28e8f9be 218static const cache_map_t ultra3_cache_map = {
2ce4da2e
DM		 219[C(L1D)] = {
220 [C(OP_READ)] = {
221 [C(RESULT_ACCESS)] = { 0x09, PIC_LOWER, },
222 [C(RESULT_MISS)] = { 0x09, PIC_UPPER, },
223 },
224 [C(OP_WRITE)] = {
225 [C(RESULT_ACCESS)] = { 0x0a, PIC_LOWER },
226 [C(RESULT_MISS)] = { 0x0a, PIC_UPPER },
227 },
228 [C(OP_PREFETCH)] = {
229 [C(RESULT_ACCESS)] = { CACHE_OP_UNSUPPORTED },
230 [C(RESULT_MISS)] = { CACHE_OP_UNSUPPORTED },
231 },
232},
233[C(L1I)] = {
234 [C(OP_READ)] = {
235 [C(RESULT_ACCESS)] = { 0x09, PIC_LOWER, },
236 [C(RESULT_MISS)] = { 0x09, PIC_UPPER, },
237 },
238 [ C(OP_WRITE) ] = {
239 [ C(RESULT_ACCESS) ] = { CACHE_OP_NONSENSE },
240 [ C(RESULT_MISS) ] = { CACHE_OP_NONSENSE },
241 },
242 [ C(OP_PREFETCH) ] = {
243 [ C(RESULT_ACCESS) ] = { CACHE_OP_UNSUPPORTED },
244 [ C(RESULT_MISS) ] = { CACHE_OP_UNSUPPORTED },
245 },
246},
247[C(LL)] = {
248 [C(OP_READ)] = {
249 [C(RESULT_ACCESS)] = { 0x0c, PIC_LOWER, },
250 [C(RESULT_MISS)] = { 0x0c, PIC_UPPER, },
251 },
252 [C(OP_WRITE)] = {
253 [C(RESULT_ACCESS)] = { 0x0c, PIC_LOWER },
254 [C(RESULT_MISS)] = { 0x0c, PIC_UPPER },
255 },
256 [C(OP_PREFETCH)] = {
257 [C(RESULT_ACCESS)] = { CACHE_OP_UNSUPPORTED },
258 [C(RESULT_MISS)] = { CACHE_OP_UNSUPPORTED },
259 },
260},
261[C(DTLB)] = {
262 [C(OP_READ)] = {
263 [C(RESULT_ACCESS)] = { CACHE_OP_UNSUPPORTED },
264 [C(RESULT_MISS)] = { 0x12, PIC_UPPER, },
265 },
266 [ C(OP_WRITE) ] = {
267 [ C(RESULT_ACCESS) ] = { CACHE_OP_UNSUPPORTED },
268 [ C(RESULT_MISS) ] = { CACHE_OP_UNSUPPORTED },
269 },
270 [ C(OP_PREFETCH) ] = {
271 [ C(RESULT_ACCESS) ] = { CACHE_OP_UNSUPPORTED },
272 [ C(RESULT_MISS) ] = { CACHE_OP_UNSUPPORTED },
273 },
274},
275[C(ITLB)] = {
276 [C(OP_READ)] = {
277 [C(RESULT_ACCESS)] = { CACHE_OP_UNSUPPORTED },
278 [C(RESULT_MISS)] = { 0x11, PIC_UPPER, },
279 },
280 [ C(OP_WRITE) ] = {
281 [ C(RESULT_ACCESS) ] = { CACHE_OP_UNSUPPORTED },
282 [ C(RESULT_MISS) ] = { CACHE_OP_UNSUPPORTED },
283 },
284 [ C(OP_PREFETCH) ] = {
285 [ C(RESULT_ACCESS) ] = { CACHE_OP_UNSUPPORTED },
286 [ C(RESULT_MISS) ] = { CACHE_OP_UNSUPPORTED },
287 },
288},
289[C(BPU)] = {
290 [C(OP_READ)] = {
291 [C(RESULT_ACCESS)] = { CACHE_OP_UNSUPPORTED },
292 [C(RESULT_MISS)] = { CACHE_OP_UNSUPPORTED },
293 },
294 [ C(OP_WRITE) ] = {
295 [ C(RESULT_ACCESS) ] = { CACHE_OP_UNSUPPORTED },
296 [ C(RESULT_MISS) ] = { CACHE_OP_UNSUPPORTED },
297 },
298 [ C(OP_PREFETCH) ] = {
299 [ C(RESULT_ACCESS) ] = { CACHE_OP_UNSUPPORTED },
300 [ C(RESULT_MISS) ] = { CACHE_OP_UNSUPPORTED },
301 },
302},
89d6c0b5
PZ		 303[C(NODE)] = {
304 [C(OP_READ)] = {
305 [C(RESULT_ACCESS)] = { CACHE_OP_UNSUPPORTED },
306 [C(RESULT_MISS) ] = { CACHE_OP_UNSUPPORTED },
307 },
308 [ C(OP_WRITE) ] = {
309 [ C(RESULT_ACCESS) ] = { CACHE_OP_UNSUPPORTED },
310 [ C(RESULT_MISS) ] = { CACHE_OP_UNSUPPORTED },
311 },
312 [ C(OP_PREFETCH) ] = {
313 [ C(RESULT_ACCESS) ] = { CACHE_OP_UNSUPPORTED },
314 [ C(RESULT_MISS) ] = { CACHE_OP_UNSUPPORTED },
315 },
316},
2ce4da2e
DM		 317};
318
28e8f9be
DM		 319static const struct sparc_pmu ultra3_pmu = {
320 .event_map = ultra3_event_map,
321 .cache_map = &ultra3_cache_map,
322 .max_events = ARRAY_SIZE(ultra3_perfmon_event_map),
5344303c
DM		 323 .read_pmc = sparc_default_read_pmc,
324 .write_pmc = sparc_default_write_pmc,
59abbd1e
DM		 325 .upper_shift = 11,
326 .lower_shift = 4,
327 .event_mask = 0x3f,
7ac2ed28
DM		 328 .user_bit = PCR_UTRACE,
329 .priv_bit = PCR_STRACE,
660d1376
DM		 330 .upper_nop = 0x1c,
331 .lower_nop = 0x14,
b38e99f5
DM		 332 .flags = (SPARC_PMU_ALL_EXCLUDES_SAME |
333 SPARC_PMU_HAS_CONFLICTS),
59660495 334 .max_hw_events = 2,
3f1a2097
DM		 335 .num_pcrs = 1,
336 .num_pic_regs = 1,
59abbd1e
DM		 337};
338
7eebda60
DM		 339/* Niagara1 is very limited. The upper PIC is hard-locked to count
340 * only instructions, so it is free running which creates all kinds of
6e804251 341 * problems. Some hardware designs make one wonder if the creator
7eebda60
DM		 342 * even looked at how this stuff gets used by software.
343 */
344static const struct perf_event_map niagara1_perfmon_event_map[] = {
345 [PERF_COUNT_HW_CPU_CYCLES] = { 0x00, PIC_UPPER },
346 [PERF_COUNT_HW_INSTRUCTIONS] = { 0x00, PIC_UPPER },
347 [PERF_COUNT_HW_CACHE_REFERENCES] = { 0, PIC_NONE },
348 [PERF_COUNT_HW_CACHE_MISSES] = { 0x03, PIC_LOWER },
349};
350
351static const struct perf_event_map *niagara1_event_map(int event_id)
352{
353 return &niagara1_perfmon_event_map[event_id];
354}
355
356static const cache_map_t niagara1_cache_map = {
357[C(L1D)] = {
358 [C(OP_READ)] = {
359 [C(RESULT_ACCESS)] = { CACHE_OP_UNSUPPORTED },
360 [C(RESULT_MISS)] = { 0x03, PIC_LOWER, },
361 },
362 [C(OP_WRITE)] = {
363 [C(RESULT_ACCESS)] = { CACHE_OP_UNSUPPORTED },
364 [C(RESULT_MISS)] = { 0x03, PIC_LOWER, },
365 },
366 [C(OP_PREFETCH)] = {
367 [C(RESULT_ACCESS)] = { CACHE_OP_UNSUPPORTED },
368 [C(RESULT_MISS)] = { CACHE_OP_UNSUPPORTED },
369 },
370},
371[C(L1I)] = {
372 [C(OP_READ)] = {
373 [C(RESULT_ACCESS)] = { 0x00, PIC_UPPER },
374 [C(RESULT_MISS)] = { 0x02, PIC_LOWER, },
375 },
376 [ C(OP_WRITE) ] = {
377 [ C(RESULT_ACCESS) ] = { CACHE_OP_NONSENSE },
378 [ C(RESULT_MISS) ] = { CACHE_OP_NONSENSE },
379 },
380 [ C(OP_PREFETCH) ] = {
381 [ C(RESULT_ACCESS) ] = { CACHE_OP_UNSUPPORTED },
382 [ C(RESULT_MISS) ] = { CACHE_OP_UNSUPPORTED },
383 },
384},
385[C(LL)] = {
386 [C(OP_READ)] = {
387 [C(RESULT_ACCESS)] = { CACHE_OP_UNSUPPORTED },
388 [C(RESULT_MISS)] = { 0x07, PIC_LOWER, },
389 },
390 [C(OP_WRITE)] = {
391 [C(RESULT_ACCESS)] = { CACHE_OP_UNSUPPORTED },
392 [C(RESULT_MISS)] = { 0x07, PIC_LOWER, },
393 },
394 [C(OP_PREFETCH)] = {
395 [C(RESULT_ACCESS)] = { CACHE_OP_UNSUPPORTED },
396 [C(RESULT_MISS)] = { CACHE_OP_UNSUPPORTED },
397 },
398},
399[C(DTLB)] = {
400 [C(OP_READ)] = {
401 [C(RESULT_ACCESS)] = { CACHE_OP_UNSUPPORTED },
402 [C(RESULT_MISS)] = { 0x05, PIC_LOWER, },
403 },
404 [ C(OP_WRITE) ] = {
405 [ C(RESULT_ACCESS) ] = { CACHE_OP_UNSUPPORTED },
406 [ C(RESULT_MISS) ] = { CACHE_OP_UNSUPPORTED },
407 },
408 [ C(OP_PREFETCH) ] = {
409 [ C(RESULT_ACCESS) ] = { CACHE_OP_UNSUPPORTED },
410 [ C(RESULT_MISS) ] = { CACHE_OP_UNSUPPORTED },
411 },
412},
413[C(ITLB)] = {
414 [C(OP_READ)] = {
415 [C(RESULT_ACCESS)] = { CACHE_OP_UNSUPPORTED },
416 [C(RESULT_MISS)] = { 0x04, PIC_LOWER, },
417 },
418 [ C(OP_WRITE) ] = {
419 [ C(RESULT_ACCESS) ] = { CACHE_OP_UNSUPPORTED },
420 [ C(RESULT_MISS) ] = { CACHE_OP_UNSUPPORTED },
421 },
422 [ C(OP_PREFETCH) ] = {
423 [ C(RESULT_ACCESS) ] = { CACHE_OP_UNSUPPORTED },
424 [ C(RESULT_MISS) ] = { CACHE_OP_UNSUPPORTED },
425 },
426},
427[C(BPU)] = {
428 [C(OP_READ)] = {
429 [C(RESULT_ACCESS)] = { CACHE_OP_UNSUPPORTED },
430 [C(RESULT_MISS)] = { CACHE_OP_UNSUPPORTED },
431 },
432 [ C(OP_WRITE) ] = {
433 [ C(RESULT_ACCESS) ] = { CACHE_OP_UNSUPPORTED },
434 [ C(RESULT_MISS) ] = { CACHE_OP_UNSUPPORTED },
435 },
436 [ C(OP_PREFETCH) ] = {
437 [ C(RESULT_ACCESS) ] = { CACHE_OP_UNSUPPORTED },
438 [ C(RESULT_MISS) ] = { CACHE_OP_UNSUPPORTED },
439 },
440},
89d6c0b5
PZ		 441[C(NODE)] = {
442 [C(OP_READ)] = {
443 [C(RESULT_ACCESS)] = { CACHE_OP_UNSUPPORTED },
444 [C(RESULT_MISS) ] = { CACHE_OP_UNSUPPORTED },
445 },
446 [ C(OP_WRITE) ] = {
447 [ C(RESULT_ACCESS) ] = { CACHE_OP_UNSUPPORTED },
448 [ C(RESULT_MISS) ] = { CACHE_OP_UNSUPPORTED },
449 },
450 [ C(OP_PREFETCH) ] = {
451 [ C(RESULT_ACCESS) ] = { CACHE_OP_UNSUPPORTED },
452 [ C(RESULT_MISS) ] = { CACHE_OP_UNSUPPORTED },
453 },
454},
7eebda60
DM		 455};
456
457static const struct sparc_pmu niagara1_pmu = {
458 .event_map = niagara1_event_map,
459 .cache_map = &niagara1_cache_map,
460 .max_events = ARRAY_SIZE(niagara1_perfmon_event_map),
5344303c
DM		 461 .read_pmc = sparc_default_read_pmc,
462 .write_pmc = sparc_default_write_pmc,
7eebda60
DM		 463 .upper_shift = 0,
464 .lower_shift = 4,
465 .event_mask = 0x7,
7ac2ed28
DM		 466 .user_bit = PCR_UTRACE,
467 .priv_bit = PCR_STRACE,
7eebda60
DM		 468 .upper_nop = 0x0,
469 .lower_nop = 0x0,
b38e99f5
DM		 470 .flags = (SPARC_PMU_ALL_EXCLUDES_SAME |
471 SPARC_PMU_HAS_CONFLICTS),
59660495 472 .max_hw_events = 2,
3f1a2097
DM		 473 .num_pcrs = 1,
474 .num_pic_regs = 1,
7eebda60
DM		 475};
476
b73d8847
DM		 477static const struct perf_event_map niagara2_perfmon_event_map[] = {
478 [PERF_COUNT_HW_CPU_CYCLES] = { 0x02ff, PIC_UPPER | PIC_LOWER },
479 [PERF_COUNT_HW_INSTRUCTIONS] = { 0x02ff, PIC_UPPER | PIC_LOWER },
480 [PERF_COUNT_HW_CACHE_REFERENCES] = { 0x0208, PIC_UPPER | PIC_LOWER },
481 [PERF_COUNT_HW_CACHE_MISSES] = { 0x0302, PIC_UPPER | PIC_LOWER },
482 [PERF_COUNT_HW_BRANCH_INSTRUCTIONS] = { 0x0201, PIC_UPPER | PIC_LOWER },
483 [PERF_COUNT_HW_BRANCH_MISSES] = { 0x0202, PIC_UPPER | PIC_LOWER },
484};
485
cdd6c482 486static const struct perf_event_map *niagara2_event_map(int event_id)
b73d8847 487{
cdd6c482 488 return &niagara2_perfmon_event_map[event_id];
b73d8847
DM		 489}
490
d0b86480
DM		 491static const cache_map_t niagara2_cache_map = {
492[C(L1D)] = {
493 [C(OP_READ)] = {
494 [C(RESULT_ACCESS)] = { 0x0208, PIC_UPPER | PIC_LOWER, },
495 [C(RESULT_MISS)] = { 0x0302, PIC_UPPER | PIC_LOWER, },
496 },
497 [C(OP_WRITE)] = {
498 [C(RESULT_ACCESS)] = { 0x0210, PIC_UPPER | PIC_LOWER, },
499 [C(RESULT_MISS)] = { 0x0302, PIC_UPPER | PIC_LOWER, },
500 },
501 [C(OP_PREFETCH)] = {
502 [C(RESULT_ACCESS)] = { CACHE_OP_UNSUPPORTED },
503 [C(RESULT_MISS)] = { CACHE_OP_UNSUPPORTED },
504 },
505},
506[C(L1I)] = {
507 [C(OP_READ)] = {
508 [C(RESULT_ACCESS)] = { 0x02ff, PIC_UPPER | PIC_LOWER, },
509 [C(RESULT_MISS)] = { 0x0301, PIC_UPPER | PIC_LOWER, },
510 },
511 [ C(OP_WRITE) ] = {
512 [ C(RESULT_ACCESS) ] = { CACHE_OP_NONSENSE },
513 [ C(RESULT_MISS) ] = { CACHE_OP_NONSENSE },
514 },
515 [ C(OP_PREFETCH) ] = {
516 [ C(RESULT_ACCESS) ] = { CACHE_OP_UNSUPPORTED },
517 [ C(RESULT_MISS) ] = { CACHE_OP_UNSUPPORTED },
518 },
519},
520[C(LL)] = {
521 [C(OP_READ)] = {
522 [C(RESULT_ACCESS)] = { 0x0208, PIC_UPPER | PIC_LOWER, },
523 [C(RESULT_MISS)] = { 0x0330, PIC_UPPER | PIC_LOWER, },
524 },
525 [C(OP_WRITE)] = {
526 [C(RESULT_ACCESS)] = { 0x0210, PIC_UPPER | PIC_LOWER, },
527 [C(RESULT_MISS)] = { 0x0320, PIC_UPPER | PIC_LOWER, },
528 },
529 [C(OP_PREFETCH)] = {
530 [C(RESULT_ACCESS)] = { CACHE_OP_UNSUPPORTED },
531 [C(RESULT_MISS)] = { CACHE_OP_UNSUPPORTED },
532 },
533},
534[C(DTLB)] = {
535 [C(OP_READ)] = {
536 [C(RESULT_ACCESS)] = { CACHE_OP_UNSUPPORTED },
537 [C(RESULT_MISS)] = { 0x0b08, PIC_UPPER | PIC_LOWER, },
538 },
539 [ C(OP_WRITE) ] = {
540 [ C(RESULT_ACCESS) ] = { CACHE_OP_UNSUPPORTED },
541 [ C(RESULT_MISS) ] = { CACHE_OP_UNSUPPORTED },
542 },
543 [ C(OP_PREFETCH) ] = {
544 [ C(RESULT_ACCESS) ] = { CACHE_OP_UNSUPPORTED },
545 [ C(RESULT_MISS) ] = { CACHE_OP_UNSUPPORTED },
546 },
547},
548[C(ITLB)] = {
549 [C(OP_READ)] = {
550 [C(RESULT_ACCESS)] = { CACHE_OP_UNSUPPORTED },
551 [C(RESULT_MISS)] = { 0xb04, PIC_UPPER | PIC_LOWER, },
552 },
553 [ C(OP_WRITE) ] = {
554 [ C(RESULT_ACCESS) ] = { CACHE_OP_UNSUPPORTED },
555 [ C(RESULT_MISS) ] = { CACHE_OP_UNSUPPORTED },
556 },
557 [ C(OP_PREFETCH) ] = {
558 [ C(RESULT_ACCESS) ] = { CACHE_OP_UNSUPPORTED },
559 [ C(RESULT_MISS) ] = { CACHE_OP_UNSUPPORTED },
560 },
561},
562[C(BPU)] = {
563 [C(OP_READ)] = {
564 [C(RESULT_ACCESS)] = { CACHE_OP_UNSUPPORTED },
565 [C(RESULT_MISS)] = { CACHE_OP_UNSUPPORTED },
566 },
567 [ C(OP_WRITE) ] = {
568 [ C(RESULT_ACCESS) ] = { CACHE_OP_UNSUPPORTED },
89d6c0b5
PZ		 569 [ C(RESULT_MISS) ] = { CACHE_OP_UNSUPPORTED },
570 },
571 [ C(OP_PREFETCH) ] = {
572 [ C(RESULT_ACCESS) ] = { CACHE_OP_UNSUPPORTED },
573 [ C(RESULT_MISS) ] = { CACHE_OP_UNSUPPORTED },
574 },
575},
576[C(NODE)] = {
577 [C(OP_READ)] = {
578 [C(RESULT_ACCESS)] = { CACHE_OP_UNSUPPORTED },
579 [C(RESULT_MISS) ] = { CACHE_OP_UNSUPPORTED },
580 },
581 [ C(OP_WRITE) ] = {
582 [ C(RESULT_ACCESS) ] = { CACHE_OP_UNSUPPORTED },
d0b86480
DM		 583 [ C(RESULT_MISS) ] = { CACHE_OP_UNSUPPORTED },
584 },
585 [ C(OP_PREFETCH) ] = {
586 [ C(RESULT_ACCESS) ] = { CACHE_OP_UNSUPPORTED },
587 [ C(RESULT_MISS) ] = { CACHE_OP_UNSUPPORTED },
588 },
589},
590};
591
b73d8847
DM		 592static const struct sparc_pmu niagara2_pmu = {
593 .event_map = niagara2_event_map,
d0b86480 594 .cache_map = &niagara2_cache_map,
b73d8847 595 .max_events = ARRAY_SIZE(niagara2_perfmon_event_map),
5344303c
DM		 596 .read_pmc = sparc_default_read_pmc,
597 .write_pmc = sparc_default_write_pmc,
b73d8847
DM		 598 .upper_shift = 19,
599 .lower_shift = 6,
600 .event_mask = 0xfff,
7ac2ed28
DM		 601 .user_bit = PCR_UTRACE,
602 .priv_bit = PCR_STRACE,
603 .hv_bit = PCR_N2_HTRACE,
de23cf3c 604 .irq_bit = 0x30,
b73d8847
DM		 605 .upper_nop = 0x220,
606 .lower_nop = 0x220,
b38e99f5
DM		 607 .flags = (SPARC_PMU_ALL_EXCLUDES_SAME |
608 SPARC_PMU_HAS_CONFLICTS),
59660495 609 .max_hw_events = 2,
3f1a2097
DM		 610 .num_pcrs = 1,
611 .num_pic_regs = 1,
b73d8847
DM		 612};
613
035ea28d
DM		 614static const struct perf_event_map niagara4_perfmon_event_map[] = {
615 [PERF_COUNT_HW_CPU_CYCLES] = { (26 << 6) },
616 [PERF_COUNT_HW_INSTRUCTIONS] = { (3 << 6) | 0x3f },
617 [PERF_COUNT_HW_CACHE_REFERENCES] = { (3 << 6) | 0x04 },
618 [PERF_COUNT_HW_CACHE_MISSES] = { (16 << 6) | 0x07 },
619 [PERF_COUNT_HW_BRANCH_INSTRUCTIONS] = { (4 << 6) | 0x01 },
620 [PERF_COUNT_HW_BRANCH_MISSES] = { (25 << 6) | 0x0f },
621};
622
623static const struct perf_event_map *niagara4_event_map(int event_id)
624{
625 return &niagara4_perfmon_event_map[event_id];
626}
627
628static const cache_map_t niagara4_cache_map = {
629[C(L1D)] = {
630 [C(OP_READ)] = {
631 [C(RESULT_ACCESS)] = { (3 << 6) | 0x04 },
632 [C(RESULT_MISS)] = { (16 << 6) | 0x07 },
633 },
634 [C(OP_WRITE)] = {
635 [C(RESULT_ACCESS)] = { (3 << 6) | 0x08 },
636 [C(RESULT_MISS)] = { (16 << 6) | 0x07 },
637 },
638 [C(OP_PREFETCH)] = {
639 [C(RESULT_ACCESS)] = { CACHE_OP_UNSUPPORTED },
640 [C(RESULT_MISS)] = { CACHE_OP_UNSUPPORTED },
641 },
642},
643[C(L1I)] = {
644 [C(OP_READ)] = {
645 [C(RESULT_ACCESS)] = { (3 << 6) | 0x3f },
646 [C(RESULT_MISS)] = { (11 << 6) | 0x03 },
647 },
648 [ C(OP_WRITE) ] = {
649 [ C(RESULT_ACCESS) ] = { CACHE_OP_NONSENSE },
650 [ C(RESULT_MISS) ] = { CACHE_OP_NONSENSE },
651 },
652 [ C(OP_PREFETCH) ] = {
653 [ C(RESULT_ACCESS) ] = { CACHE_OP_UNSUPPORTED },
654 [ C(RESULT_MISS) ] = { CACHE_OP_UNSUPPORTED },
655 },
656},
657[C(LL)] = {
658 [C(OP_READ)] = {
659 [C(RESULT_ACCESS)] = { (3 << 6) | 0x04 },
660 [C(RESULT_MISS)] = { CACHE_OP_UNSUPPORTED },
661 },
662 [C(OP_WRITE)] = {
663 [C(RESULT_ACCESS)] = { (3 << 6) | 0x08 },
664 [C(RESULT_MISS)] = { CACHE_OP_UNSUPPORTED },
665 },
666 [C(OP_PREFETCH)] = {
667 [C(RESULT_ACCESS)] = { CACHE_OP_UNSUPPORTED },
668 [C(RESULT_MISS)] = { CACHE_OP_UNSUPPORTED },
669 },
670},
671[C(DTLB)] = {
672 [C(OP_READ)] = {
673 [C(RESULT_ACCESS)] = { CACHE_OP_UNSUPPORTED },
674 [C(RESULT_MISS)] = { (17 << 6) | 0x3f },
675 },
676 [ C(OP_WRITE) ] = {
677 [ C(RESULT_ACCESS) ] = { CACHE_OP_UNSUPPORTED },
678 [ C(RESULT_MISS) ] = { CACHE_OP_UNSUPPORTED },
679 },
680 [ C(OP_PREFETCH) ] = {
681 [ C(RESULT_ACCESS) ] = { CACHE_OP_UNSUPPORTED },
682 [ C(RESULT_MISS) ] = { CACHE_OP_UNSUPPORTED },
683 },
684},
685[C(ITLB)] = {
686 [C(OP_READ)] = {
687 [C(RESULT_ACCESS)] = { CACHE_OP_UNSUPPORTED },
688 [C(RESULT_MISS)] = { (6 << 6) | 0x3f },
689 },
690 [ C(OP_WRITE) ] = {
691 [ C(RESULT_ACCESS) ] = { CACHE_OP_UNSUPPORTED },
692 [ C(RESULT_MISS) ] = { CACHE_OP_UNSUPPORTED },
693 },
694 [ C(OP_PREFETCH) ] = {
695 [ C(RESULT_ACCESS) ] = { CACHE_OP_UNSUPPORTED },
696 [ C(RESULT_MISS) ] = { CACHE_OP_UNSUPPORTED },
697 },
698},
699[C(BPU)] = {
700 [C(OP_READ)] = {
701 [C(RESULT_ACCESS)] = { CACHE_OP_UNSUPPORTED },
702 [C(RESULT_MISS)] = { CACHE_OP_UNSUPPORTED },
703 },
704 [ C(OP_WRITE) ] = {
705 [ C(RESULT_ACCESS) ] = { CACHE_OP_UNSUPPORTED },
706 [ C(RESULT_MISS) ] = { CACHE_OP_UNSUPPORTED },
707 },
708 [ C(OP_PREFETCH) ] = {
709 [ C(RESULT_ACCESS) ] = { CACHE_OP_UNSUPPORTED },
710 [ C(RESULT_MISS) ] = { CACHE_OP_UNSUPPORTED },
711 },
712},
713[C(NODE)] = {
714 [C(OP_READ)] = {
715 [C(RESULT_ACCESS)] = { CACHE_OP_UNSUPPORTED },
716 [C(RESULT_MISS) ] = { CACHE_OP_UNSUPPORTED },
717 },
718 [ C(OP_WRITE) ] = {
719 [ C(RESULT_ACCESS) ] = { CACHE_OP_UNSUPPORTED },
720 [ C(RESULT_MISS) ] = { CACHE_OP_UNSUPPORTED },
721 },
722 [ C(OP_PREFETCH) ] = {
723 [ C(RESULT_ACCESS) ] = { CACHE_OP_UNSUPPORTED },
724 [ C(RESULT_MISS) ] = { CACHE_OP_UNSUPPORTED },
725 },
726},
727};
728
729static u32 sparc_vt_read_pmc(int idx)
730{
731 u64 val = pcr_ops->read_pic(idx);
732
733 return val & 0xffffffff;
734}
735
736static void sparc_vt_write_pmc(int idx, u64 val)
737{
738 u64 pcr;
739
740 /* There seems to be an internal latch on the overflow event
741 * on SPARC-T4 that prevents it from triggering unless you
742 * update the PIC exactly as we do here. The requirement
743 * seems to be that you have to turn off event counting in the
744 * PCR around the PIC update.
745 *
746 * For example, after the following sequence:
747 *
748 * 1) set PIC to -1
749 * 2) enable event counting and overflow reporting in PCR
750 * 3) overflow triggers, softint 15 handler invoked
751 * 4) clear OV bit in PCR
752 * 5) write PIC to -1
753 *
754 * a subsequent overflow event will not trigger. This
755 * sequence works on SPARC-T3 and previous chips.
756 */
757 pcr = pcr_ops->read_pcr(idx);
758 pcr_ops->write_pcr(idx, PCR_N4_PICNPT);
759
760 pcr_ops->write_pic(idx, val & 0xffffffff);
761
762 pcr_ops->write_pcr(idx, pcr);
763}
764
765static const struct sparc_pmu niagara4_pmu = {
766 .event_map = niagara4_event_map,
767 .cache_map = &niagara4_cache_map,
768 .max_events = ARRAY_SIZE(niagara4_perfmon_event_map),
769 .read_pmc = sparc_vt_read_pmc,
770 .write_pmc = sparc_vt_write_pmc,
771 .upper_shift = 5,
772 .lower_shift = 5,
773 .event_mask = 0x7ff,
774 .user_bit = PCR_N4_UTRACE,
775 .priv_bit = PCR_N4_STRACE,
776
777 /* We explicitly don't support hypervisor tracing. The T4
778 * generates the overflow event for precise events via a trap
779 * which will not be generated (ie. it's completely lost) if
780 * we happen to be in the hypervisor when the event triggers.
781 * Essentially, the overflow event reporting is completely
782 * unusable when you have hypervisor mode tracing enabled.
783 */
784 .hv_bit = 0,
785
786 .irq_bit = PCR_N4_TOE,
787 .upper_nop = 0,
788 .lower_nop = 0,
789 .flags = 0,
790 .max_hw_events = 4,
791 .num_pcrs = 4,
792 .num_pic_regs = 4,
793};
794
59abbd1e
DM		 795static const struct sparc_pmu *sparc_pmu __read_mostly;
796
cdd6c482 797static u64 event_encoding(u64 event_id, int idx)
59abbd1e
DM		 798{
799 if (idx == PIC_UPPER_INDEX)
cdd6c482 800 event_id <<= sparc_pmu->upper_shift;
59abbd1e 801 else
cdd6c482
IM		 802 event_id <<= sparc_pmu->lower_shift;
803 return event_id;
59abbd1e
DM		 804}
805
806static u64 mask_for_index(int idx)
807{
808 return event_encoding(sparc_pmu->event_mask, idx);
809}
810
811static u64 nop_for_index(int idx)
812{
813 return event_encoding(idx == PIC_UPPER_INDEX ?
660d1376
DM		 814 sparc_pmu->upper_nop :
815 sparc_pmu->lower_nop, idx);
59abbd1e
DM		 816}
817
d1751388 818static inline void sparc_pmu_enable_event(struct cpu_hw_events *cpuc, struct hw_perf_event *hwc, int idx)
59abbd1e 819{
e793d8c6 820 u64 enc, val, mask = mask_for_index(idx);
b4f061a4 821 int pcr_index = 0;
59abbd1e 822
b4f061a4
DM		 823 if (sparc_pmu->num_pcrs > 1)
824 pcr_index = idx;
825
e793d8c6
DM		 826 enc = perf_event_get_enc(cpuc->events[idx]);
827
b4f061a4 828 val = cpuc->pcr[pcr_index];
d1751388 829 val &= ~mask;
e793d8c6 830 val |= event_encoding(enc, idx);
b4f061a4 831 cpuc->pcr[pcr_index] = val;
d1751388 832
b4f061a4 833 pcr_ops->write_pcr(pcr_index, cpuc->pcr[pcr_index]);
59abbd1e
DM		 834}
835
d1751388 836static inline void sparc_pmu_disable_event(struct cpu_hw_events *cpuc, struct hw_perf_event *hwc, int idx)
59abbd1e
DM		 837{
838 u64 mask = mask_for_index(idx);
839 u64 nop = nop_for_index(idx);
b4f061a4 840 int pcr_index = 0;
d1751388 841 u64 val;
59abbd1e 842
b4f061a4
DM		 843 if (sparc_pmu->num_pcrs > 1)
844 pcr_index = idx;
845
846 val = cpuc->pcr[pcr_index];
d1751388
DM		 847 val &= ~mask;
848 val |= nop;
b4f061a4 849 cpuc->pcr[pcr_index] = val;
d1751388 850
b4f061a4 851 pcr_ops->write_pcr(pcr_index, cpuc->pcr[pcr_index]);
59abbd1e
DM		 852}
853
e7bef6b0
DM		 854static u64 sparc_perf_event_update(struct perf_event *event,
855 struct hw_perf_event *hwc, int idx)
856{
857 int shift = 64 - 32;
858 u64 prev_raw_count, new_raw_count;
859 s64 delta;
860
861again:
e7850595 862 prev_raw_count = local64_read(&hwc->prev_count);
5344303c 863 new_raw_count = sparc_pmu->read_pmc(idx);
e7bef6b0 864
e7850595 865 if (local64_cmpxchg(&hwc->prev_count, prev_raw_count,
e7bef6b0
DM		 866 new_raw_count) != prev_raw_count)
867 goto again;
868
869 delta = (new_raw_count << shift) - (prev_raw_count << shift);
870 delta >>= shift;
871
e7850595
PZ		 872 local64_add(delta, &event->count);
873 local64_sub(delta, &hwc->period_left);
e7bef6b0
DM		 874
875 return new_raw_count;
876}
877
cdd6c482 878static int sparc_perf_event_set_period(struct perf_event *event,
d29862f0 879 struct hw_perf_event *hwc, int idx)
59abbd1e 880{
e7850595 881 s64 left = local64_read(&hwc->period_left);
59abbd1e
DM		 882 s64 period = hwc->sample_period;
883 int ret = 0;
884
885 if (unlikely(left <= -period)) {
886 left = period;
e7850595 887 local64_set(&hwc->period_left, left);
59abbd1e
DM		 888 hwc->last_period = period;
889 ret = 1;
890 }
891
892 if (unlikely(left <= 0)) {
893 left += period;
e7850595 894 local64_set(&hwc->period_left, left);
59abbd1e
DM		 895 hwc->last_period = period;
896 ret = 1;
897 }
898 if (left > MAX_PERIOD)
899 left = MAX_PERIOD;
900
e7850595 901 local64_set(&hwc->prev_count, (u64)-left);
59abbd1e 902
5344303c 903 sparc_pmu->write_pmc(idx, (u64)(-left) & 0xffffffff);
59abbd1e 904
cdd6c482 905 perf_event_update_userpage(event);
59abbd1e
DM		 906
907 return ret;
908}
909
7a37a0b8 910static void read_in_all_counters(struct cpu_hw_events *cpuc)
59abbd1e 911{
e7bef6b0 912 int i;
59abbd1e 913
e7bef6b0
DM		 914 for (i = 0; i < cpuc->n_events; i++) {
915 struct perf_event *cp = cpuc->event[i];
59abbd1e 916
e7bef6b0
DM		 917 if (cpuc->current_idx[i] != PIC_NO_INDEX &&
918 cpuc->current_idx[i] != cp->hw.idx) {
919 sparc_perf_event_update(cp, &cp->hw,
920 cpuc->current_idx[i]);
921 cpuc->current_idx[i] = PIC_NO_INDEX;
922 }
923 }
7a37a0b8
DM		 924}
925
926/* On this PMU all PICs are programmed using a single PCR. Calculate
927 * the combined control register value.
928 *
929 * For such chips we require that all of the events have the same
930 * configuration, so just fetch the settings from the first entry.
931 */
932static void calculate_single_pcr(struct cpu_hw_events *cpuc)
933{
934 int i;
935
936 if (!cpuc->n_added)
937 goto out;
59abbd1e 938
e7bef6b0
DM		 939 /* Assign to counters all unassigned events. */
940 for (i = 0; i < cpuc->n_events; i++) {
941 struct perf_event *cp = cpuc->event[i];
942 struct hw_perf_event *hwc = &cp->hw;
943 int idx = hwc->idx;
944 u64 enc;
945
946 if (cpuc->current_idx[i] != PIC_NO_INDEX)
947 continue;
948
949 sparc_perf_event_set_period(cp, hwc, idx);
950 cpuc->current_idx[i] = idx;
951
952 enc = perf_event_get_enc(cpuc->events[i]);
7a37a0b8 953 cpuc->pcr[0] &= ~mask_for_index(idx);
a4eaf7f1 954 if (hwc->state & PERF_HES_STOPPED)
7a37a0b8 955 cpuc->pcr[0] |= nop_for_index(idx);
a4eaf7f1 956 else
7a37a0b8 957 cpuc->pcr[0] |= event_encoding(enc, idx);
e7bef6b0
DM		 958 }
959out:
7a37a0b8
DM		 960 cpuc->pcr[0] |= cpuc->event[0]->hw.config_base;
961}
962
963/* On this PMU each PIC has it's own PCR control register. */
964static void calculate_multiple_pcrs(struct cpu_hw_events *cpuc)
965{
966 int i;
967
968 if (!cpuc->n_added)
969 goto out;
970
971 for (i = 0; i < cpuc->n_events; i++) {
972 struct perf_event *cp = cpuc->event[i];
973 struct hw_perf_event *hwc = &cp->hw;
974 int idx = hwc->idx;
975 u64 enc;
976
977 if (cpuc->current_idx[i] != PIC_NO_INDEX)
978 continue;
979
980 sparc_perf_event_set_period(cp, hwc, idx);
981 cpuc->current_idx[i] = idx;
982
983 enc = perf_event_get_enc(cpuc->events[i]);
984 cpuc->pcr[idx] &= ~mask_for_index(idx);
985 if (hwc->state & PERF_HES_STOPPED)
986 cpuc->pcr[idx] |= nop_for_index(idx);
987 else
988 cpuc->pcr[idx] |= event_encoding(enc, idx);
989 }
990out:
991 for (i = 0; i < cpuc->n_events; i++) {
992 struct perf_event *cp = cpuc->event[i];
993 int idx = cp->hw.idx;
994
995 cpuc->pcr[idx] |= cp->hw.config_base;
996 }
997}
998
999/* If performance event entries have been added, move existing events
1000 * around (if necessary) and then assign new entries to counters.
1001 */
1002static void update_pcrs_for_enable(struct cpu_hw_events *cpuc)
1003{
1004 if (cpuc->n_added)
1005 read_in_all_counters(cpuc);
1006
1007 if (sparc_pmu->num_pcrs == 1) {
1008 calculate_single_pcr(cpuc);
1009 } else {
1010 calculate_multiple_pcrs(cpuc);
1011 }
59abbd1e
DM		 1012}
1013
a4eaf7f1 1014static void sparc_pmu_enable(struct pmu *pmu)
59abbd1e 1015{
e7bef6b0 1016 struct cpu_hw_events *cpuc = &__get_cpu_var(cpu_hw_events);
7a37a0b8 1017 int i;
59abbd1e 1018
e7bef6b0
DM		 1019 if (cpuc->enabled)
1020 return;
59abbd1e 1021
e7bef6b0
DM		 1022 cpuc->enabled = 1;
1023 barrier();
59abbd1e 1024
7a37a0b8
DM		 1025 if (cpuc->n_events)
1026 update_pcrs_for_enable(cpuc);
59abbd1e 1027
7a37a0b8
DM		 1028 for (i = 0; i < sparc_pmu->num_pcrs; i++)
1029 pcr_ops->write_pcr(i, cpuc->pcr[i]);
e7bef6b0
DM		 1030}
1031
a4eaf7f1 1032static void sparc_pmu_disable(struct pmu *pmu)
e7bef6b0
DM		 1033{
1034 struct cpu_hw_events *cpuc = &__get_cpu_var(cpu_hw_events);
3f1a2097 1035 int i;
e7bef6b0
DM		 1036
1037 if (!cpuc->enabled)
1038 return;
1039
1040 cpuc->enabled = 0;
1041 cpuc->n_added = 0;
1042
3f1a2097
DM		 1043 for (i = 0; i < sparc_pmu->num_pcrs; i++) {
1044 u64 val = cpuc->pcr[i];
e7bef6b0 1045
3f1a2097
DM		 1046 val &= ~(sparc_pmu->user_bit | sparc_pmu->priv_bit |
1047 sparc_pmu->hv_bit | sparc_pmu->irq_bit);
1048 cpuc->pcr[i] = val;
1049 pcr_ops->write_pcr(i, cpuc->pcr[i]);
1050 }
59abbd1e
DM		 1051}
1052
a4eaf7f1
PZ		 1053static int active_event_index(struct cpu_hw_events *cpuc,
1054 struct perf_event *event)
1055{
1056 int i;
1057
1058 for (i = 0; i < cpuc->n_events; i++) {
1059 if (cpuc->event[i] == event)
1060 break;
1061 }
1062 BUG_ON(i == cpuc->n_events);
1063 return cpuc->current_idx[i];
1064}
1065
1066static void sparc_pmu_start(struct perf_event *event, int flags)
1067{
1068 struct cpu_hw_events *cpuc = &__get_cpu_var(cpu_hw_events);
1069 int idx = active_event_index(cpuc, event);
1070
1071 if (flags & PERF_EF_RELOAD) {
1072 WARN_ON_ONCE(!(event->hw.state & PERF_HES_UPTODATE));
1073 sparc_perf_event_set_period(event, &event->hw, idx);
1074 }
1075
1076 event->hw.state = 0;
1077
1078 sparc_pmu_enable_event(cpuc, &event->hw, idx);
1079}
1080
1081static void sparc_pmu_stop(struct perf_event *event, int flags)
1082{
1083 struct cpu_hw_events *cpuc = &__get_cpu_var(cpu_hw_events);
1084 int idx = active_event_index(cpuc, event);
1085
1086 if (!(event->hw.state & PERF_HES_STOPPED)) {
1087 sparc_pmu_disable_event(cpuc, &event->hw, idx);
1088 event->hw.state |= PERF_HES_STOPPED;
1089 }
1090
1091 if (!(event->hw.state & PERF_HES_UPTODATE) && (flags & PERF_EF_UPDATE)) {
1092 sparc_perf_event_update(event, &event->hw, idx);
1093 event->hw.state |= PERF_HES_UPTODATE;
1094 }
1095}
1096
1097static void sparc_pmu_del(struct perf_event *event, int _flags)
59abbd1e 1098{
cdd6c482 1099 struct cpu_hw_events *cpuc = &__get_cpu_var(cpu_hw_events);
e7bef6b0
DM		 1100 unsigned long flags;
1101 int i;
59abbd1e 1102
e7bef6b0 1103 local_irq_save(flags);
33696fc0 1104 perf_pmu_disable(event->pmu);
e7bef6b0
DM		 1105
1106 for (i = 0; i < cpuc->n_events; i++) {
1107 if (event == cpuc->event[i]) {
a4eaf7f1
PZ		 1108 /* Absorb the final count and turn off the
1109 * event.
1110 */
1111 sparc_pmu_stop(event, PERF_EF_UPDATE);
e7bef6b0
DM		 1112
1113 /* Shift remaining entries down into
1114 * the existing slot.
1115 */
1116 while (++i < cpuc->n_events) {
1117 cpuc->event[i - 1] = cpuc->event[i];
1118 cpuc->events[i - 1] = cpuc->events[i];
1119 cpuc->current_idx[i - 1] =
1120 cpuc->current_idx[i];
1121 }
1122
e7bef6b0 1123 perf_event_update_userpage(event);
59abbd1e 1124
e7bef6b0
DM		 1125 cpuc->n_events--;
1126 break;
1127 }
1128 }
59abbd1e 1129
33696fc0 1130 perf_pmu_enable(event->pmu);
e7bef6b0
DM		 1131 local_irq_restore(flags);
1132}
1133
cdd6c482 1134static void sparc_pmu_read(struct perf_event *event)
59abbd1e 1135{
e7bef6b0
DM		 1136 struct cpu_hw_events *cpuc = &__get_cpu_var(cpu_hw_events);
1137 int idx = active_event_index(cpuc, event);
cdd6c482 1138 struct hw_perf_event *hwc = &event->hw;
d1751388 1139
e7bef6b0 1140 sparc_perf_event_update(event, hwc, idx);
59abbd1e
DM		 1141}
1142
cdd6c482 1143static atomic_t active_events = ATOMIC_INIT(0);
59abbd1e
DM		 1144static DEFINE_MUTEX(pmc_grab_mutex);
1145
d1751388
DM		 1146static void perf_stop_nmi_watchdog(void *unused)
1147{
1148 struct cpu_hw_events *cpuc = &__get_cpu_var(cpu_hw_events);
3f1a2097 1149 int i;
d1751388
DM		 1150
1151 stop_nmi_watchdog(NULL);
3f1a2097
DM		 1152 for (i = 0; i < sparc_pmu->num_pcrs; i++)
1153 cpuc->pcr[i] = pcr_ops->read_pcr(i);
d1751388
DM		 1154}
1155
265c1ffa 1156static void perf_event_grab_pmc(void)
59abbd1e 1157{
cdd6c482 1158 if (atomic_inc_not_zero(&active_events))
59abbd1e
DM		 1159 return;
1160
1161 mutex_lock(&pmc_grab_mutex);
cdd6c482 1162 if (atomic_read(&active_events) == 0) {
59abbd1e 1163 if (atomic_read(&nmi_active) > 0) {
d1751388 1164 on_each_cpu(perf_stop_nmi_watchdog, NULL, 1);
59abbd1e
DM		 1165 BUG_ON(atomic_read(&nmi_active) != 0);
1166 }
cdd6c482 1167 atomic_inc(&active_events);
59abbd1e
DM		 1168 }
1169 mutex_unlock(&pmc_grab_mutex);
1170}
1171
265c1ffa 1172static void perf_event_release_pmc(void)
59abbd1e 1173{
cdd6c482 1174 if (atomic_dec_and_mutex_lock(&active_events, &pmc_grab_mutex)) {
59abbd1e
DM		 1175 if (atomic_read(&nmi_active) == 0)
1176 on_each_cpu(start_nmi_watchdog, NULL, 1);
1177 mutex_unlock(&pmc_grab_mutex);
1178 }
1179}
1180
2ce4da2e
DM		 1181static const struct perf_event_map *sparc_map_cache_event(u64 config)
1182{
1183 unsigned int cache_type, cache_op, cache_result;
1184 const struct perf_event_map *pmap;
1185
1186 if (!sparc_pmu->cache_map)
1187 return ERR_PTR(-ENOENT);
1188
1189 cache_type = (config >> 0) & 0xff;
1190 if (cache_type >= PERF_COUNT_HW_CACHE_MAX)
1191 return ERR_PTR(-EINVAL);
1192
1193 cache_op = (config >> 8) & 0xff;
1194 if (cache_op >= PERF_COUNT_HW_CACHE_OP_MAX)
1195 return ERR_PTR(-EINVAL);
1196
1197 cache_result = (config >> 16) & 0xff;
1198 if (cache_result >= PERF_COUNT_HW_CACHE_RESULT_MAX)
1199 return ERR_PTR(-EINVAL);
1200
1201 pmap = &((*sparc_pmu->cache_map)[cache_type][cache_op][cache_result]);
1202
1203 if (pmap->encoding == CACHE_OP_UNSUPPORTED)
1204 return ERR_PTR(-ENOENT);
1205
1206 if (pmap->encoding == CACHE_OP_NONSENSE)
1207 return ERR_PTR(-EINVAL);
1208
1209 return pmap;
1210}
1211
cdd6c482 1212static void hw_perf_event_destroy(struct perf_event *event)
59abbd1e 1213{
cdd6c482 1214 perf_event_release_pmc();
59abbd1e
DM		 1215}
1216
a72a8a5f
DM		 1217/* Make sure all events can be scheduled into the hardware at
1218 * the same time. This is simplified by the fact that we only
1219 * need to support 2 simultaneous HW events.
e7bef6b0
DM		 1220 *
1221 * As a side effect, the evts[]->hw.idx values will be assigned
1222 * on success. These are pending indexes. When the events are
1223 * actually programmed into the chip, these values will propagate
1224 * to the per-cpu cpuc->current_idx[] slots, see the code in
1225 * maybe_change_configuration() for details.
a72a8a5f 1226 */
e7bef6b0
DM		 1227static int sparc_check_constraints(struct perf_event **evts,
1228 unsigned long *events, int n_ev)
a72a8a5f 1229{
e7bef6b0
DM		 1230 u8 msk0 = 0, msk1 = 0;
1231 int idx0 = 0;
1232
1233 /* This case is possible when we are invoked from
1234 * hw_perf_group_sched_in().
1235 */
1236 if (!n_ev)
1237 return 0;
1238
59660495 1239 if (n_ev > sparc_pmu->max_hw_events)
e7bef6b0
DM		 1240 return -1;
1241
b38e99f5
DM		 1242 if (!(sparc_pmu->flags & SPARC_PMU_HAS_CONFLICTS)) {
1243 int i;
1244
1245 for (i = 0; i < n_ev; i++)
1246 evts[i]->hw.idx = i;
1247 return 0;
1248 }
1249
e7bef6b0
DM		 1250 msk0 = perf_event_get_msk(events[0]);
1251 if (n_ev == 1) {
1252 if (msk0 & PIC_LOWER)
1253 idx0 = 1;
1254 goto success;
1255 }
1256 BUG_ON(n_ev != 2);
1257 msk1 = perf_event_get_msk(events[1]);
1258
1259 /* If both events can go on any counter, OK. */
1260 if (msk0 == (PIC_UPPER | PIC_LOWER) &&
1261 msk1 == (PIC_UPPER | PIC_LOWER))
1262 goto success;
1263
1264 /* If one event is limited to a specific counter,
1265 * and the other can go on both, OK.
1266 */
1267 if ((msk0 == PIC_UPPER || msk0 == PIC_LOWER) &&
1268 msk1 == (PIC_UPPER | PIC_LOWER)) {
1269 if (msk0 & PIC_LOWER)
1270 idx0 = 1;
1271 goto success;
a72a8a5f
DM		 1272 }
1273
e7bef6b0
DM		 1274 if ((msk1 == PIC_UPPER || msk1 == PIC_LOWER) &&
1275 msk0 == (PIC_UPPER | PIC_LOWER)) {
1276 if (msk1 & PIC_UPPER)
1277 idx0 = 1;
1278 goto success;
1279 }
1280
1281 /* If the events are fixed to different counters, OK. */
1282 if ((msk0 == PIC_UPPER && msk1 == PIC_LOWER) ||
1283 (msk0 == PIC_LOWER && msk1 == PIC_UPPER)) {
1284 if (msk0 & PIC_LOWER)
1285 idx0 = 1;
1286 goto success;
1287 }
1288
1289 /* Otherwise, there is a conflict. */
a72a8a5f 1290 return -1;
e7bef6b0
DM		 1291
1292success:
1293 evts[0]->hw.idx = idx0;
1294 if (n_ev == 2)
1295 evts[1]->hw.idx = idx0 ^ 1;
1296 return 0;
a72a8a5f
DM		 1297}
1298
01552f76
DM		 1299static int check_excludes(struct perf_event **evts, int n_prev, int n_new)
1300{
1301 int eu = 0, ek = 0, eh = 0;
1302 struct perf_event *event;
1303 int i, n, first;
1304
b38e99f5
DM		 1305 if (!(sparc_pmu->flags & SPARC_PMU_ALL_EXCLUDES_SAME))
1306 return 0;
1307
01552f76
DM		 1308 n = n_prev + n_new;
1309 if (n <= 1)
1310 return 0;
1311
1312 first = 1;
1313 for (i = 0; i < n; i++) {
1314 event = evts[i];
1315 if (first) {
1316 eu = event->attr.exclude_user;
1317 ek = event->attr.exclude_kernel;
1318 eh = event->attr.exclude_hv;
1319 first = 0;
1320 } else if (event->attr.exclude_user != eu ||
1321 event->attr.exclude_kernel != ek ||
1322 event->attr.exclude_hv != eh) {
1323 return -EAGAIN;
1324 }
1325 }
1326
1327 return 0;
1328}
1329
1330static int collect_events(struct perf_event *group, int max_count,
e7bef6b0
DM		 1331 struct perf_event *evts[], unsigned long *events,
1332 int *current_idx)
01552f76
DM		 1333{
1334 struct perf_event *event;
1335 int n = 0;
1336
1337 if (!is_software_event(group)) {
1338 if (n >= max_count)
1339 return -1;
1340 evts[n] = group;
e7bef6b0
DM		 1341 events[n] = group->hw.event_base;
1342 current_idx[n++] = PIC_NO_INDEX;
01552f76
DM		 1343 }
1344 list_for_each_entry(event, &group->sibling_list, group_entry) {
1345 if (!is_software_event(event) &&
1346 event->state != PERF_EVENT_STATE_OFF) {
1347 if (n >= max_count)
1348 return -1;
1349 evts[n] = event;
e7bef6b0
DM		 1350 events[n] = event->hw.event_base;
1351 current_idx[n++] = PIC_NO_INDEX;
01552f76
DM		 1352 }
1353 }
1354 return n;
1355}
1356
a4eaf7f1 1357static int sparc_pmu_add(struct perf_event *event, int ef_flags)
e7bef6b0
DM		 1358{
1359 struct cpu_hw_events *cpuc = &__get_cpu_var(cpu_hw_events);
1360 int n0, ret = -EAGAIN;
1361 unsigned long flags;
1362
1363 local_irq_save(flags);
33696fc0 1364 perf_pmu_disable(event->pmu);
e7bef6b0
DM		 1365
1366 n0 = cpuc->n_events;
59660495 1367 if (n0 >= sparc_pmu->max_hw_events)
e7bef6b0
DM		 1368 goto out;
1369
1370 cpuc->event[n0] = event;
1371 cpuc->events[n0] = event->hw.event_base;
1372 cpuc->current_idx[n0] = PIC_NO_INDEX;
1373
a4eaf7f1
PZ		 1374 event->hw.state = PERF_HES_UPTODATE;
1375 if (!(ef_flags & PERF_EF_START))
1376 event->hw.state |= PERF_HES_STOPPED;
1377
a13c3afd
LM		 1378 /*
1379 * If group events scheduling transaction was started,
25985edc 1380 * skip the schedulability test here, it will be performed
a13c3afd
LM		 1381 * at commit time(->commit_txn) as a whole
1382 */
8d2cacbb 1383 if (cpuc->group_flag & PERF_EVENT_TXN)
a13c3afd
LM		 1384 goto nocheck;
1385
e7bef6b0
DM		 1386 if (check_excludes(cpuc->event, n0, 1))
1387 goto out;
1388 if (sparc_check_constraints(cpuc->event, cpuc->events, n0 + 1))
1389 goto out;
1390
a13c3afd 1391nocheck:
e7bef6b0
DM		 1392 cpuc->n_events++;
1393 cpuc->n_added++;
1394
1395 ret = 0;
1396out:
33696fc0 1397 perf_pmu_enable(event->pmu);
e7bef6b0
DM		 1398 local_irq_restore(flags);
1399 return ret;
1400}
1401
b0a873eb 1402static int sparc_pmu_event_init(struct perf_event *event)
59abbd1e 1403{
cdd6c482 1404 struct perf_event_attr *attr = &event->attr;
01552f76 1405 struct perf_event *evts[MAX_HWEVENTS];
cdd6c482 1406 struct hw_perf_event *hwc = &event->hw;
a72a8a5f 1407 unsigned long events[MAX_HWEVENTS];
e7bef6b0 1408 int current_idx_dmy[MAX_HWEVENTS];
59abbd1e 1409 const struct perf_event_map *pmap;
01552f76 1410 int n;
59abbd1e
DM		 1411
1412 if (atomic_read(&nmi_active) < 0)
1413 return -ENODEV;
1414
2481c5fa
SE		 1415 /* does not support taken branch sampling */
1416 if (has_branch_stack(event))
1417 return -EOPNOTSUPP;
1418
b0a873eb
PZ		 1419 switch (attr->type) {
1420 case PERF_TYPE_HARDWARE:
2ce4da2e
DM		 1421 if (attr->config >= sparc_pmu->max_events)
1422 return -EINVAL;
1423 pmap = sparc_pmu->event_map(attr->config);
b0a873eb
PZ		 1424 break;
1425
1426 case PERF_TYPE_HW_CACHE:
2ce4da2e
DM		 1427 pmap = sparc_map_cache_event(attr->config);
1428 if (IS_ERR(pmap))
1429 return PTR_ERR(pmap);
b0a873eb
PZ		 1430 break;
1431
1432 case PERF_TYPE_RAW:
d0303d71
IM		 1433 pmap = NULL;
1434 break;
59abbd1e 1435
b0a873eb
PZ		 1436 default:
1437 return -ENOENT;
1438
1439 }
1440
b343ae51
DM		 1441 if (pmap) {
1442 hwc->event_base = perf_event_encode(pmap);
1443 } else {
d0303d71
IM		 1444 /*
1445 * User gives us "(encoding << 16) | pic_mask" for
b343ae51
DM		 1446 * PERF_TYPE_RAW events.
1447 */
1448 hwc->event_base = attr->config;
1449 }
1450
e7bef6b0 1451 /* We save the enable bits in the config_base. */
496c07e3 1452 hwc->config_base = sparc_pmu->irq_bit;
59abbd1e 1453 if (!attr->exclude_user)
7ac2ed28 1454 hwc->config_base |= sparc_pmu->user_bit;
59abbd1e 1455 if (!attr->exclude_kernel)
7ac2ed28 1456 hwc->config_base |= sparc_pmu->priv_bit;
91b9286d
DM		 1457 if (!attr->exclude_hv)
1458 hwc->config_base |= sparc_pmu->hv_bit;
59abbd1e 1459
01552f76
DM		 1460 n = 0;
1461 if (event->group_leader != event) {
1462 n = collect_events(event->group_leader,
59660495 1463 sparc_pmu->max_hw_events - 1,
e7bef6b0 1464 evts, events, current_idx_dmy);
01552f76
DM		 1465 if (n < 0)
1466 return -EINVAL;
1467 }
a72a8a5f 1468 events[n] = hwc->event_base;
01552f76
DM		 1469 evts[n] = event;
1470
1471 if (check_excludes(evts, n, 1))
1472 return -EINVAL;
1473
e7bef6b0 1474 if (sparc_check_constraints(evts, events, n + 1))
a72a8a5f
DM		 1475 return -EINVAL;
1476
e7bef6b0
DM		 1477 hwc->idx = PIC_NO_INDEX;
1478
01552f76
DM		 1479 /* Try to do all error checking before this point, as unwinding
1480 * state after grabbing the PMC is difficult.
1481 */
1482 perf_event_grab_pmc();
1483 event->destroy = hw_perf_event_destroy;
1484
59abbd1e
DM		 1485 if (!hwc->sample_period) {
1486 hwc->sample_period = MAX_PERIOD;
1487 hwc->last_period = hwc->sample_period;
e7850595 1488 local64_set(&hwc->period_left, hwc->sample_period);
59abbd1e
DM		 1489 }
1490
59abbd1e
DM		 1491 return 0;
1492}
1493
a13c3afd
LM		 1494/*
1495 * Start group events scheduling transaction
1496 * Set the flag to make pmu::enable() not perform the
1497 * schedulability test, it will be performed at commit time
1498 */
51b0fe39 1499static void sparc_pmu_start_txn(struct pmu *pmu)
a13c3afd
LM		 1500{
1501 struct cpu_hw_events *cpuhw = &__get_cpu_var(cpu_hw_events);
1502
33696fc0 1503 perf_pmu_disable(pmu);
8d2cacbb 1504 cpuhw->group_flag |= PERF_EVENT_TXN;
a13c3afd
LM		 1505}
1506
1507/*
1508 * Stop group events scheduling transaction
1509 * Clear the flag and pmu::enable() will perform the
1510 * schedulability test.
1511 */
51b0fe39 1512static void sparc_pmu_cancel_txn(struct pmu *pmu)
a13c3afd
LM		 1513{
1514 struct cpu_hw_events *cpuhw = &__get_cpu_var(cpu_hw_events);
1515
8d2cacbb 1516 cpuhw->group_flag &= ~PERF_EVENT_TXN;
33696fc0 1517 perf_pmu_enable(pmu);
a13c3afd
LM		 1518}
1519
1520/*
1521 * Commit group events scheduling transaction
1522 * Perform the group schedulability test as a whole
1523 * Return 0 if success
1524 */
51b0fe39 1525static int sparc_pmu_commit_txn(struct pmu *pmu)
a13c3afd
LM		 1526{
1527 struct cpu_hw_events *cpuc = &__get_cpu_var(cpu_hw_events);
1528 int n;
1529
1530 if (!sparc_pmu)
1531 return -EINVAL;
1532
1533 cpuc = &__get_cpu_var(cpu_hw_events);
1534 n = cpuc->n_events;
1535 if (check_excludes(cpuc->event, 0, n))
1536 return -EINVAL;
1537 if (sparc_check_constraints(cpuc->event, cpuc->events, n))
1538 return -EAGAIN;
1539
8d2cacbb 1540 cpuc->group_flag &= ~PERF_EVENT_TXN;
33696fc0 1541 perf_pmu_enable(pmu);
a13c3afd
LM		 1542 return 0;
1543}
1544
51b0fe39 1545static struct pmu pmu = {
a4eaf7f1
PZ		 1546 .pmu_enable = sparc_pmu_enable,
1547 .pmu_disable = sparc_pmu_disable,
b0a873eb 1548 .event_init = sparc_pmu_event_init,
a4eaf7f1
PZ		 1549 .add = sparc_pmu_add,
1550 .del = sparc_pmu_del,
1551 .start = sparc_pmu_start,
1552 .stop = sparc_pmu_stop,
59abbd1e 1553 .read = sparc_pmu_read,
a13c3afd
LM		 1554 .start_txn = sparc_pmu_start_txn,
1555 .cancel_txn = sparc_pmu_cancel_txn,
1556 .commit_txn = sparc_pmu_commit_txn,
59abbd1e
DM		 1557};
1558
cdd6c482 1559void perf_event_print_debug(void)
59abbd1e
DM		 1560{
1561 unsigned long flags;
3f1a2097 1562 int cpu, i;
59abbd1e
DM		 1563
1564 if (!sparc_pmu)
1565 return;
1566
1567 local_irq_save(flags);
1568
1569 cpu = smp_processor_id();
1570
59abbd1e 1571 pr_info("\n");
3f1a2097
DM		 1572 for (i = 0; i < sparc_pmu->num_pcrs; i++)
1573 pr_info("CPU#%d: PCR%d[%016llx]\n",
1574 cpu, i, pcr_ops->read_pcr(i));
1575 for (i = 0; i < sparc_pmu->num_pic_regs; i++)
1576 pr_info("CPU#%d: PIC%d[%016llx]\n",
1577 cpu, i, pcr_ops->read_pic(i));
59abbd1e
DM		 1578
1579 local_irq_restore(flags);
1580}
1581
cdd6c482 1582static int __kprobes perf_event_nmi_handler(struct notifier_block *self,
d29862f0 1583 unsigned long cmd, void *__args)
59abbd1e
DM		 1584{
1585 struct die_args *args = __args;
1586 struct perf_sample_data data;
cdd6c482 1587 struct cpu_hw_events *cpuc;
59abbd1e 1588 struct pt_regs *regs;
e7bef6b0 1589 int i;
59abbd1e 1590
cdd6c482 1591 if (!atomic_read(&active_events))
59abbd1e
DM		 1592 return NOTIFY_DONE;
1593
1594 switch (cmd) {
1595 case DIE_NMI:
1596 break;
1597
1598 default:
1599 return NOTIFY_DONE;
1600 }
1601
1602 regs = args->regs;
1603
cdd6c482 1604 cpuc = &__get_cpu_var(cpu_hw_events);
e04ed38d
DM		 1605
1606 /* If the PMU has the TOE IRQ enable bits, we need to do a
1607 * dummy write to the %pcr to clear the overflow bits and thus
1608 * the interrupt.
1609 *
1610 * Do this before we peek at the counters to determine
1611 * overflow so we don't lose any events.
1612 */
3f1a2097
DM		 1613 if (sparc_pmu->irq_bit &&
1614 sparc_pmu->num_pcrs == 1)
1615 pcr_ops->write_pcr(0, cpuc->pcr[0]);
e04ed38d 1616
e7bef6b0
DM		 1617 for (i = 0; i < cpuc->n_events; i++) {
1618 struct perf_event *event = cpuc->event[i];
1619 int idx = cpuc->current_idx[i];
cdd6c482 1620 struct hw_perf_event *hwc;
59abbd1e
DM		 1621 u64 val;
1622
3f1a2097
DM		 1623 if (sparc_pmu->irq_bit &&
1624 sparc_pmu->num_pcrs > 1)
1625 pcr_ops->write_pcr(idx, cpuc->pcr[idx]);
1626
cdd6c482
IM		 1627 hwc = &event->hw;
1628 val = sparc_perf_event_update(event, hwc, idx);
59abbd1e
DM		 1629 if (val & (1ULL << 31))
1630 continue;
1631
fd0d000b 1632 perf_sample_data_init(&data, 0, hwc->last_period);
cdd6c482 1633 if (!sparc_perf_event_set_period(event, hwc, idx))
59abbd1e
DM		 1634 continue;
1635
a8b0ca17 1636 if (perf_event_overflow(event, &data, regs))
a4eaf7f1 1637 sparc_pmu_stop(event, 0);
59abbd1e
DM		 1638 }
1639
1640 return NOTIFY_STOP;
1641}
1642
cdd6c482
IM		 1643static __read_mostly struct notifier_block perf_event_nmi_notifier = {
1644 .notifier_call = perf_event_nmi_handler,
59abbd1e
DM		 1645};
1646
1647static bool __init supported_pmu(void)
1648{
28e8f9be
DM		 1649 if (!strcmp(sparc_pmu_type, "ultra3") ||
1650 !strcmp(sparc_pmu_type, "ultra3+") ||
1651 !strcmp(sparc_pmu_type, "ultra3i") ||
1652 !strcmp(sparc_pmu_type, "ultra4+")) {
1653 sparc_pmu = &ultra3_pmu;
59abbd1e
DM		 1654 return true;
1655 }
7eebda60
DM		 1656 if (!strcmp(sparc_pmu_type, "niagara")) {
1657 sparc_pmu = &niagara1_pmu;
1658 return true;
1659 }
4ba991d3
DM		 1660 if (!strcmp(sparc_pmu_type, "niagara2") ||
1661 !strcmp(sparc_pmu_type, "niagara3")) {
b73d8847
DM		 1662 sparc_pmu = &niagara2_pmu;
1663 return true;
1664 }
035ea28d
DM		 1665 if (!strcmp(sparc_pmu_type, "niagara4")) {
1666 sparc_pmu = &niagara4_pmu;
1667 return true;
1668 }
59abbd1e
DM		 1669 return false;
1670}
1671
265c1ffa 1672static int __init init_hw_perf_events(void)
59abbd1e 1673{
8bccf5b3
DM		 1674 int err;
1675
cdd6c482 1676 pr_info("Performance events: ");
59abbd1e 1677
8bccf5b3
DM		 1678 err = pcr_arch_init();
1679 if (err || !supported_pmu()) {
59abbd1e 1680 pr_cont("No support for PMU type '%s'\n", sparc_pmu_type);
004417a6 1681 return 0;
59abbd1e
DM		 1682 }
1683
1684 pr_cont("Supported PMU type is '%s'\n", sparc_pmu_type);
1685
2e80a82a 1686 perf_pmu_register(&pmu, "cpu", PERF_TYPE_RAW);
cdd6c482 1687 register_die_notifier(&perf_event_nmi_notifier);
004417a6
PZ		 1688
1689 return 0;
59abbd1e 1690}
8bccf5b3 1691pure_initcall(init_hw_perf_events);
4f6dbe4a 1692
56962b44
FW		 1693void perf_callchain_kernel(struct perf_callchain_entry *entry,
1694 struct pt_regs *regs)
4f6dbe4a
DM		 1695{
1696 unsigned long ksp, fp;
667f0cee
DM		 1697#ifdef CONFIG_FUNCTION_GRAPH_TRACER
1698 int graph = 0;
1699#endif
4f6dbe4a 1700
56962b44
FW		 1701 stack_trace_flush();
1702
70791ce9 1703 perf_callchain_store(entry, regs->tpc);
4f6dbe4a
DM		 1704
1705 ksp = regs->u_regs[UREG_I6];
1706 fp = ksp + STACK_BIAS;
1707 do {
1708 struct sparc_stackf *sf;
1709 struct pt_regs *regs;
1710 unsigned long pc;
1711
1712 if (!kstack_valid(current_thread_info(), fp))
1713 break;
1714
1715 sf = (struct sparc_stackf *) fp;
1716 regs = (struct pt_regs *) (sf + 1);
1717
1718 if (kstack_is_trap_frame(current_thread_info(), regs)) {
1719 if (user_mode(regs))
1720 break;
1721 pc = regs->tpc;
1722 fp = regs->u_regs[UREG_I6] + STACK_BIAS;
1723 } else {
1724 pc = sf->callers_pc;
1725 fp = (unsigned long)sf->fp + STACK_BIAS;
1726 }
70791ce9 1727 perf_callchain_store(entry, pc);
667f0cee
DM		 1728#ifdef CONFIG_FUNCTION_GRAPH_TRACER
1729 if ((pc + 8UL) == (unsigned long) &return_to_handler) {
1730 int index = current->curr_ret_stack;
1731 if (current->ret_stack && index >= graph) {
1732 pc = current->ret_stack[index - graph].ret;
70791ce9 1733 perf_callchain_store(entry, pc);
667f0cee
DM		 1734 graph++;
1735 }
1736 }
1737#endif
4f6dbe4a
DM		 1738 } while (entry->nr < PERF_MAX_STACK_DEPTH);
1739}
1740
56962b44
FW		 1741static void perf_callchain_user_64(struct perf_callchain_entry *entry,
1742 struct pt_regs *regs)
4f6dbe4a
DM		 1743{
1744 unsigned long ufp;
1745
4f6dbe4a
DM		 1746 ufp = regs->u_regs[UREG_I6] + STACK_BIAS;
1747 do {
265c1ffa
SR		 1748 struct sparc_stackf __user *usf;
1749 struct sparc_stackf sf;
4f6dbe4a
DM		 1750 unsigned long pc;
1751
265c1ffa 1752 usf = (struct sparc_stackf __user *)ufp;
4f6dbe4a
DM		 1753 if (__copy_from_user_inatomic(&sf, usf, sizeof(sf)))
1754 break;
1755
1756 pc = sf.callers_pc;
1757 ufp = (unsigned long)sf.fp + STACK_BIAS;
70791ce9 1758 perf_callchain_store(entry, pc);
4f6dbe4a
DM		 1759 } while (entry->nr < PERF_MAX_STACK_DEPTH);
1760}
1761
56962b44
FW		 1762static void perf_callchain_user_32(struct perf_callchain_entry *entry,
1763 struct pt_regs *regs)
4f6dbe4a
DM		 1764{
1765 unsigned long ufp;
1766
9e8307ec 1767 ufp = regs->u_regs[UREG_I6] & 0xffffffffUL;
4f6dbe4a 1768 do {
4f6dbe4a
DM		 1769 unsigned long pc;
1770
517ffce4 1771 if (thread32_stack_is_64bit(ufp)) {
265c1ffa
SR		 1772 struct sparc_stackf __user *usf;
1773 struct sparc_stackf sf;
4f6dbe4a 1774
517ffce4 1775 ufp += STACK_BIAS;
265c1ffa 1776 usf = (struct sparc_stackf __user *)ufp;
517ffce4
DM		 1777 if (__copy_from_user_inatomic(&sf, usf, sizeof(sf)))
1778 break;
1779 pc = sf.callers_pc & 0xffffffff;
1780 ufp = ((unsigned long) sf.fp) & 0xffffffff;
1781 } else {
265c1ffa
SR		 1782 struct sparc_stackf32 __user *usf;
1783 struct sparc_stackf32 sf;
1784 usf = (struct sparc_stackf32 __user *)ufp;
517ffce4
DM		 1785 if (__copy_from_user_inatomic(&sf, usf, sizeof(sf)))
1786 break;
1787 pc = sf.callers_pc;
1788 ufp = (unsigned long)sf.fp;
1789 }
70791ce9 1790 perf_callchain_store(entry, pc);
4f6dbe4a
DM		 1791 } while (entry->nr < PERF_MAX_STACK_DEPTH);
1792}
1793
56962b44
FW		 1794void
1795perf_callchain_user(struct perf_callchain_entry *entry, struct pt_regs *regs)
4f6dbe4a 1796{
08280e6c
DM		 1797 perf_callchain_store(entry, regs->tpc);
1798
1799 if (!current->mm)
1800 return;
1801
56962b44
FW		 1802 flushw_user();
1803 if (test_thread_flag(TIF_32BIT))
1804 perf_callchain_user_32(entry, regs);
1805 else
1806 perf_callchain_user_64(entry, regs);
4f6dbe4a 1807}
Linux 6.x block layer and io_uring tree(s)