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ARM: perf: refactor event mapping
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / arch / arm / kernel / perf_event_v6.c
CommitLineData
43eab878
WD		 1/*
2 * ARMv6 Performance counter handling code.
3 *
4 * Copyright (C) 2009 picoChip Designs, Ltd., Jamie Iles
5 *
6 * ARMv6 has 2 configurable performance counters and a single cycle counter.
7 * They all share a single reset bit but can be written to zero so we can use
8 * that for a reset.
9 *
10 * The counters can't be individually enabled or disabled so when we remove
11 * one event and replace it with another we could get spurious counts from the
12 * wrong event. However, we can take advantage of the fact that the
13 * performance counters can export events to the event bus, and the event bus
14 * itself can be monitored. This requires that we *don't* export the events to
15 * the event bus. The procedure for disabling a configurable counter is:
16 * - change the counter to count the ETMEXTOUT[0] signal (0x20). This
17 * effectively stops the counter from counting.
18 * - disable the counter's interrupt generation (each counter has it's
19 * own interrupt enable bit).
20 * Once stopped, the counter value can be written as 0 to reset.
21 *
22 * To enable a counter:
23 * - enable the counter's interrupt generation.
24 * - set the new event type.
25 *
26 * Note: the dedicated cycle counter only counts cycles and can't be
27 * enabled/disabled independently of the others. When we want to disable the
28 * cycle counter, we have to just disable the interrupt reporting and start
29 * ignoring that counter. When re-enabling, we have to reset the value and
30 * enable the interrupt.
31 */
32
e399b1a4 33#if defined(CONFIG_CPU_V6) || defined(CONFIG_CPU_V6K)
43eab878
WD		 34enum armv6_perf_types {
35 ARMV6_PERFCTR_ICACHE_MISS = 0x0,
36 ARMV6_PERFCTR_IBUF_STALL = 0x1,
37 ARMV6_PERFCTR_DDEP_STALL = 0x2,
38 ARMV6_PERFCTR_ITLB_MISS = 0x3,
39 ARMV6_PERFCTR_DTLB_MISS = 0x4,
40 ARMV6_PERFCTR_BR_EXEC = 0x5,
41 ARMV6_PERFCTR_BR_MISPREDICT = 0x6,
42 ARMV6_PERFCTR_INSTR_EXEC = 0x7,
43 ARMV6_PERFCTR_DCACHE_HIT = 0x9,
44 ARMV6_PERFCTR_DCACHE_ACCESS = 0xA,
45 ARMV6_PERFCTR_DCACHE_MISS = 0xB,
46 ARMV6_PERFCTR_DCACHE_WBACK = 0xC,
47 ARMV6_PERFCTR_SW_PC_CHANGE = 0xD,
48 ARMV6_PERFCTR_MAIN_TLB_MISS = 0xF,
49 ARMV6_PERFCTR_EXPL_D_ACCESS = 0x10,
50 ARMV6_PERFCTR_LSU_FULL_STALL = 0x11,
51 ARMV6_PERFCTR_WBUF_DRAINED = 0x12,
52 ARMV6_PERFCTR_CPU_CYCLES = 0xFF,
53 ARMV6_PERFCTR_NOP = 0x20,
54};
55
56enum armv6_counters {
d2b41f74 57 ARMV6_CYCLE_COUNTER = 0,
43eab878
WD		 58 ARMV6_COUNTER0,
59 ARMV6_COUNTER1,
60};
61
62/*
63 * The hardware events that we support. We do support cache operations but
64 * we have harvard caches and no way to combine instruction and data
65 * accesses/misses in hardware.
66 */
67static const unsigned armv6_perf_map[PERF_COUNT_HW_MAX] = {
68 [PERF_COUNT_HW_CPU_CYCLES] = ARMV6_PERFCTR_CPU_CYCLES,
69 [PERF_COUNT_HW_INSTRUCTIONS] = ARMV6_PERFCTR_INSTR_EXEC,
70 [PERF_COUNT_HW_CACHE_REFERENCES] = HW_OP_UNSUPPORTED,
71 [PERF_COUNT_HW_CACHE_MISSES] = HW_OP_UNSUPPORTED,
72 [PERF_COUNT_HW_BRANCH_INSTRUCTIONS] = ARMV6_PERFCTR_BR_EXEC,
73 [PERF_COUNT_HW_BRANCH_MISSES] = ARMV6_PERFCTR_BR_MISPREDICT,
74 [PERF_COUNT_HW_BUS_CYCLES] = HW_OP_UNSUPPORTED,
75};
76
77static const unsigned armv6_perf_cache_map[PERF_COUNT_HW_CACHE_MAX]
78 [PERF_COUNT_HW_CACHE_OP_MAX]
79 [PERF_COUNT_HW_CACHE_RESULT_MAX] = {
80 [C(L1D)] = {
81 /*
82 * The performance counters don't differentiate between read
83 * and write accesses/misses so this isn't strictly correct,
84 * but it's the best we can do. Writes and reads get
85 * combined.
86 */
87 [C(OP_READ)] = {
88 [C(RESULT_ACCESS)] = ARMV6_PERFCTR_DCACHE_ACCESS,
89 [C(RESULT_MISS)] = ARMV6_PERFCTR_DCACHE_MISS,
90 },
91 [C(OP_WRITE)] = {
92 [C(RESULT_ACCESS)] = ARMV6_PERFCTR_DCACHE_ACCESS,
93 [C(RESULT_MISS)] = ARMV6_PERFCTR_DCACHE_MISS,
94 },
95 [C(OP_PREFETCH)] = {
96 [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
97 [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED,
98 },
99 },
100 [C(L1I)] = {
101 [C(OP_READ)] = {
102 [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
103 [C(RESULT_MISS)] = ARMV6_PERFCTR_ICACHE_MISS,
104 },
105 [C(OP_WRITE)] = {
106 [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
107 [C(RESULT_MISS)] = ARMV6_PERFCTR_ICACHE_MISS,
108 },
109 [C(OP_PREFETCH)] = {
110 [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
111 [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED,
112 },
113 },
114 [C(LL)] = {
115 [C(OP_READ)] = {
116 [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
117 [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED,
118 },
119 [C(OP_WRITE)] = {
120 [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
121 [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED,
122 },
123 [C(OP_PREFETCH)] = {
124 [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
125 [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED,
126 },
127 },
128 [C(DTLB)] = {
129 /*
130 * The ARM performance counters can count micro DTLB misses,
131 * micro ITLB misses and main TLB misses. There isn't an event
132 * for TLB misses, so use the micro misses here and if users
133 * want the main TLB misses they can use a raw counter.
134 */
135 [C(OP_READ)] = {
136 [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
137 [C(RESULT_MISS)] = ARMV6_PERFCTR_DTLB_MISS,
138 },
139 [C(OP_WRITE)] = {
140 [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
141 [C(RESULT_MISS)] = ARMV6_PERFCTR_DTLB_MISS,
142 },
143 [C(OP_PREFETCH)] = {
144 [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
145 [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED,
146 },
147 },
148 [C(ITLB)] = {
149 [C(OP_READ)] = {
150 [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
151 [C(RESULT_MISS)] = ARMV6_PERFCTR_ITLB_MISS,
152 },
153 [C(OP_WRITE)] = {
154 [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
155 [C(RESULT_MISS)] = ARMV6_PERFCTR_ITLB_MISS,
156 },
157 [C(OP_PREFETCH)] = {
158 [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
159 [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED,
160 },
161 },
162 [C(BPU)] = {
163 [C(OP_READ)] = {
164 [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
165 [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED,
166 },
167 [C(OP_WRITE)] = {
168 [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
169 [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED,
170 },
171 [C(OP_PREFETCH)] = {
172 [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
173 [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED,
174 },
175 },
89d6c0b5
PZ		 176 [C(NODE)] = {
177 [C(OP_READ)] = {
178 [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
179 [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED,
180 },
181 [C(OP_WRITE)] = {
182 [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
183 [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED,
184 },
185 [C(OP_PREFETCH)] = {
186 [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
187 [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED,
188 },
189 },
43eab878
WD		 190};
191
192enum armv6mpcore_perf_types {
193 ARMV6MPCORE_PERFCTR_ICACHE_MISS = 0x0,
194 ARMV6MPCORE_PERFCTR_IBUF_STALL = 0x1,
195 ARMV6MPCORE_PERFCTR_DDEP_STALL = 0x2,
196 ARMV6MPCORE_PERFCTR_ITLB_MISS = 0x3,
197 ARMV6MPCORE_PERFCTR_DTLB_MISS = 0x4,
198 ARMV6MPCORE_PERFCTR_BR_EXEC = 0x5,
199 ARMV6MPCORE_PERFCTR_BR_NOTPREDICT = 0x6,
200 ARMV6MPCORE_PERFCTR_BR_MISPREDICT = 0x7,
201 ARMV6MPCORE_PERFCTR_INSTR_EXEC = 0x8,
202 ARMV6MPCORE_PERFCTR_DCACHE_RDACCESS = 0xA,
203 ARMV6MPCORE_PERFCTR_DCACHE_RDMISS = 0xB,
204 ARMV6MPCORE_PERFCTR_DCACHE_WRACCESS = 0xC,
205 ARMV6MPCORE_PERFCTR_DCACHE_WRMISS = 0xD,
206 ARMV6MPCORE_PERFCTR_DCACHE_EVICTION = 0xE,
207 ARMV6MPCORE_PERFCTR_SW_PC_CHANGE = 0xF,
208 ARMV6MPCORE_PERFCTR_MAIN_TLB_MISS = 0x10,
209 ARMV6MPCORE_PERFCTR_EXPL_MEM_ACCESS = 0x11,
210 ARMV6MPCORE_PERFCTR_LSU_FULL_STALL = 0x12,
211 ARMV6MPCORE_PERFCTR_WBUF_DRAINED = 0x13,
212 ARMV6MPCORE_PERFCTR_CPU_CYCLES = 0xFF,
213};
214
215/*
216 * The hardware events that we support. We do support cache operations but
217 * we have harvard caches and no way to combine instruction and data
218 * accesses/misses in hardware.
219 */
220static const unsigned armv6mpcore_perf_map[PERF_COUNT_HW_MAX] = {
221 [PERF_COUNT_HW_CPU_CYCLES] = ARMV6MPCORE_PERFCTR_CPU_CYCLES,
222 [PERF_COUNT_HW_INSTRUCTIONS] = ARMV6MPCORE_PERFCTR_INSTR_EXEC,
223 [PERF_COUNT_HW_CACHE_REFERENCES] = HW_OP_UNSUPPORTED,
224 [PERF_COUNT_HW_CACHE_MISSES] = HW_OP_UNSUPPORTED,
225 [PERF_COUNT_HW_BRANCH_INSTRUCTIONS] = ARMV6MPCORE_PERFCTR_BR_EXEC,
226 [PERF_COUNT_HW_BRANCH_MISSES] = ARMV6MPCORE_PERFCTR_BR_MISPREDICT,
227 [PERF_COUNT_HW_BUS_CYCLES] = HW_OP_UNSUPPORTED,
228};
229
230static const unsigned armv6mpcore_perf_cache_map[PERF_COUNT_HW_CACHE_MAX]
231 [PERF_COUNT_HW_CACHE_OP_MAX]
232 [PERF_COUNT_HW_CACHE_RESULT_MAX] = {
233 [C(L1D)] = {
234 [C(OP_READ)] = {
235 [C(RESULT_ACCESS)] =
236 ARMV6MPCORE_PERFCTR_DCACHE_RDACCESS,
237 [C(RESULT_MISS)] =
238 ARMV6MPCORE_PERFCTR_DCACHE_RDMISS,
239 },
240 [C(OP_WRITE)] = {
241 [C(RESULT_ACCESS)] =
242 ARMV6MPCORE_PERFCTR_DCACHE_WRACCESS,
243 [C(RESULT_MISS)] =
244 ARMV6MPCORE_PERFCTR_DCACHE_WRMISS,
245 },
246 [C(OP_PREFETCH)] = {
247 [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
248 [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED,
249 },
250 },
251 [C(L1I)] = {
252 [C(OP_READ)] = {
253 [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
254 [C(RESULT_MISS)] = ARMV6MPCORE_PERFCTR_ICACHE_MISS,
255 },
256 [C(OP_WRITE)] = {
257 [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
258 [C(RESULT_MISS)] = ARMV6MPCORE_PERFCTR_ICACHE_MISS,
259 },
260 [C(OP_PREFETCH)] = {
261 [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
262 [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED,
263 },
264 },
265 [C(LL)] = {
266 [C(OP_READ)] = {
267 [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
268 [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED,
269 },
270 [C(OP_WRITE)] = {
271 [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
272 [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED,
273 },
274 [C(OP_PREFETCH)] = {
275 [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
276 [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED,
277 },
278 },
279 [C(DTLB)] = {
280 /*
281 * The ARM performance counters can count micro DTLB misses,
282 * micro ITLB misses and main TLB misses. There isn't an event
283 * for TLB misses, so use the micro misses here and if users
284 * want the main TLB misses they can use a raw counter.
285 */
286 [C(OP_READ)] = {
287 [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
288 [C(RESULT_MISS)] = ARMV6MPCORE_PERFCTR_DTLB_MISS,
289 },
290 [C(OP_WRITE)] = {
291 [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
292 [C(RESULT_MISS)] = ARMV6MPCORE_PERFCTR_DTLB_MISS,
293 },
294 [C(OP_PREFETCH)] = {
295 [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
296 [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED,
297 },
298 },
299 [C(ITLB)] = {
300 [C(OP_READ)] = {
301 [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
302 [C(RESULT_MISS)] = ARMV6MPCORE_PERFCTR_ITLB_MISS,
303 },
304 [C(OP_WRITE)] = {
305 [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
306 [C(RESULT_MISS)] = ARMV6MPCORE_PERFCTR_ITLB_MISS,
307 },
308 [C(OP_PREFETCH)] = {
309 [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
310 [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED,
311 },
312 },
313 [C(BPU)] = {
314 [C(OP_READ)] = {
315 [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
316 [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED,
317 },
318 [C(OP_WRITE)] = {
319 [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
320 [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED,
321 },
322 [C(OP_PREFETCH)] = {
323 [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
324 [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED,
325 },
326 },
89d6c0b5
PZ		 327 [C(NODE)] = {
328 [C(OP_READ)] = {
329 [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
330 [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED,
331 },
332 [C(OP_WRITE)] = {
333 [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
334 [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED,
335 },
336 [C(OP_PREFETCH)] = {
337 [C(RESULT_ACCESS)] = CACHE_OP_UNSUPPORTED,
338 [C(RESULT_MISS)] = CACHE_OP_UNSUPPORTED,
339 },
340 },
43eab878
WD		 341};
342
343static inline unsigned long
344armv6_pmcr_read(void)
345{
346 u32 val;
347 asm volatile("mrc p15, 0, %0, c15, c12, 0" : "=r"(val));
348 return val;
349}
350
351static inline void
352armv6_pmcr_write(unsigned long val)
353{
354 asm volatile("mcr p15, 0, %0, c15, c12, 0" : : "r"(val));
355}
356
357#define ARMV6_PMCR_ENABLE (1 << 0)
358#define ARMV6_PMCR_CTR01_RESET (1 << 1)
359#define ARMV6_PMCR_CCOUNT_RESET (1 << 2)
360#define ARMV6_PMCR_CCOUNT_DIV (1 << 3)
361#define ARMV6_PMCR_COUNT0_IEN (1 << 4)
362#define ARMV6_PMCR_COUNT1_IEN (1 << 5)
363#define ARMV6_PMCR_CCOUNT_IEN (1 << 6)
364#define ARMV6_PMCR_COUNT0_OVERFLOW (1 << 8)
365#define ARMV6_PMCR_COUNT1_OVERFLOW (1 << 9)
366#define ARMV6_PMCR_CCOUNT_OVERFLOW (1 << 10)
367#define ARMV6_PMCR_EVT_COUNT0_SHIFT 20
368#define ARMV6_PMCR_EVT_COUNT0_MASK (0xFF << ARMV6_PMCR_EVT_COUNT0_SHIFT)
369#define ARMV6_PMCR_EVT_COUNT1_SHIFT 12
370#define ARMV6_PMCR_EVT_COUNT1_MASK (0xFF << ARMV6_PMCR_EVT_COUNT1_SHIFT)
371
372#define ARMV6_PMCR_OVERFLOWED_MASK \
373 (ARMV6_PMCR_COUNT0_OVERFLOW | ARMV6_PMCR_COUNT1_OVERFLOW | \
374 ARMV6_PMCR_CCOUNT_OVERFLOW)
375
376static inline int
377armv6_pmcr_has_overflowed(unsigned long pmcr)
378{
379 return pmcr & ARMV6_PMCR_OVERFLOWED_MASK;
380}
381
382static inline int
383armv6_pmcr_counter_has_overflowed(unsigned long pmcr,
384 enum armv6_counters counter)
385{
386 int ret = 0;
387
388 if (ARMV6_CYCLE_COUNTER == counter)
389 ret = pmcr & ARMV6_PMCR_CCOUNT_OVERFLOW;
390 else if (ARMV6_COUNTER0 == counter)
391 ret = pmcr & ARMV6_PMCR_COUNT0_OVERFLOW;
392 else if (ARMV6_COUNTER1 == counter)
393 ret = pmcr & ARMV6_PMCR_COUNT1_OVERFLOW;
394 else
395 WARN_ONCE(1, "invalid counter number (%d)\n", counter);
396
397 return ret;
398}
399
400static inline u32
401armv6pmu_read_counter(int counter)
402{
403 unsigned long value = 0;
404
405 if (ARMV6_CYCLE_COUNTER == counter)
406 asm volatile("mrc p15, 0, %0, c15, c12, 1" : "=r"(value));
407 else if (ARMV6_COUNTER0 == counter)
408 asm volatile("mrc p15, 0, %0, c15, c12, 2" : "=r"(value));
409 else if (ARMV6_COUNTER1 == counter)
410 asm volatile("mrc p15, 0, %0, c15, c12, 3" : "=r"(value));
411 else
412 WARN_ONCE(1, "invalid counter number (%d)\n", counter);
413
414 return value;
415}
416
417static inline void
418armv6pmu_write_counter(int counter,
419 u32 value)
420{
421 if (ARMV6_CYCLE_COUNTER == counter)
422 asm volatile("mcr p15, 0, %0, c15, c12, 1" : : "r"(value));
423 else if (ARMV6_COUNTER0 == counter)
424 asm volatile("mcr p15, 0, %0, c15, c12, 2" : : "r"(value));
425 else if (ARMV6_COUNTER1 == counter)
426 asm volatile("mcr p15, 0, %0, c15, c12, 3" : : "r"(value));
427 else
428 WARN_ONCE(1, "invalid counter number (%d)\n", counter);
429}
430
4d6b7a77 431static void
43eab878
WD		 432armv6pmu_enable_event(struct hw_perf_event *hwc,
433 int idx)
434{
435 unsigned long val, mask, evt, flags;
0f78d2d5 436 struct cpu_hw_events *events = armpmu->get_hw_events();
43eab878
WD		 437
438 if (ARMV6_CYCLE_COUNTER == idx) {
439 mask = 0;
440 evt = ARMV6_PMCR_CCOUNT_IEN;
441 } else if (ARMV6_COUNTER0 == idx) {
442 mask = ARMV6_PMCR_EVT_COUNT0_MASK;
443 evt = (hwc->config_base << ARMV6_PMCR_EVT_COUNT0_SHIFT) |
444 ARMV6_PMCR_COUNT0_IEN;
445 } else if (ARMV6_COUNTER1 == idx) {
446 mask = ARMV6_PMCR_EVT_COUNT1_MASK;
447 evt = (hwc->config_base << ARMV6_PMCR_EVT_COUNT1_SHIFT) |
448 ARMV6_PMCR_COUNT1_IEN;
449 } else {
450 WARN_ONCE(1, "invalid counter number (%d)\n", idx);
451 return;
452 }
453
454 /*
455 * Mask out the current event and set the counter to count the event
456 * that we're interested in.
457 */
0f78d2d5 458 raw_spin_lock_irqsave(&events->pmu_lock, flags);
43eab878
WD		 459 val = armv6_pmcr_read();
460 val &= ~mask;
461 val |= evt;
462 armv6_pmcr_write(val);
0f78d2d5 463 raw_spin_unlock_irqrestore(&events->pmu_lock, flags);
43eab878
WD		 464}
465
c47f8684
MR		 466static int counter_is_active(unsigned long pmcr, int idx)
467{
468 unsigned long mask = 0;
469 if (idx == ARMV6_CYCLE_COUNTER)
470 mask = ARMV6_PMCR_CCOUNT_IEN;
471 else if (idx == ARMV6_COUNTER0)
472 mask = ARMV6_PMCR_COUNT0_IEN;
473 else if (idx == ARMV6_COUNTER1)
474 mask = ARMV6_PMCR_COUNT1_IEN;
475
476 if (mask)
477 return pmcr & mask;
478
479 WARN_ONCE(1, "invalid counter number (%d)\n", idx);
480 return 0;
481}
482
43eab878
WD		 483static irqreturn_t
484armv6pmu_handle_irq(int irq_num,
485 void *dev)
486{
487 unsigned long pmcr = armv6_pmcr_read();
488 struct perf_sample_data data;
489 struct cpu_hw_events *cpuc;
490 struct pt_regs *regs;
491 int idx;
492
493 if (!armv6_pmcr_has_overflowed(pmcr))
494 return IRQ_NONE;
495
496 regs = get_irq_regs();
497
498 /*
499 * The interrupts are cleared by writing the overflow flags back to
500 * the control register. All of the other bits don't have any effect
501 * if they are rewritten, so write the whole value back.
502 */
503 armv6_pmcr_write(pmcr);
504
505 perf_sample_data_init(&data, 0);
506
507 cpuc = &__get_cpu_var(cpu_hw_events);
d2b41f74 508 for (idx = 0; idx < armpmu->num_events; ++idx) {
43eab878
WD		 509 struct perf_event *event = cpuc->events[idx];
510 struct hw_perf_event *hwc;
511
c47f8684 512 if (!counter_is_active(pmcr, idx))
43eab878
WD		 513 continue;
514
515 /*
516 * We have a single interrupt for all counters. Check that
517 * each counter has overflowed before we process it.
518 */
519 if (!armv6_pmcr_counter_has_overflowed(pmcr, idx))
520 continue;
521
522 hwc = &event->hw;
a737823d 523 armpmu_event_update(event, hwc, idx, 1);
43eab878
WD		 524 data.period = event->hw.last_period;
525 if (!armpmu_event_set_period(event, hwc, idx))
526 continue;
527
a8b0ca17 528 if (perf_event_overflow(event, &data, regs))
43eab878
WD		 529 armpmu->disable(hwc, idx);
530 }
531
532 /*
533 * Handle the pending perf events.
534 *
535 * Note: this call *must* be run with interrupts disabled. For
536 * platforms that can have the PMU interrupts raised as an NMI, this
537 * will not work.
538 */
539 irq_work_run();
540
541 return IRQ_HANDLED;
542}
543
544static void
545armv6pmu_start(void)
546{
547 unsigned long flags, val;
0f78d2d5 548 struct cpu_hw_events *events = armpmu->get_hw_events();
43eab878 549
0f78d2d5 550 raw_spin_lock_irqsave(&events->pmu_lock, flags);
43eab878
WD		 551 val = armv6_pmcr_read();
552 val |= ARMV6_PMCR_ENABLE;
553 armv6_pmcr_write(val);
0f78d2d5 554 raw_spin_unlock_irqrestore(&events->pmu_lock, flags);
43eab878
WD		 555}
556
557static void
558armv6pmu_stop(void)
559{
560 unsigned long flags, val;
0f78d2d5 561 struct cpu_hw_events *events = armpmu->get_hw_events();
43eab878 562
0f78d2d5 563 raw_spin_lock_irqsave(&events->pmu_lock, flags);
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WD		 564 val = armv6_pmcr_read();
565 val &= ~ARMV6_PMCR_ENABLE;
566 armv6_pmcr_write(val);
0f78d2d5 567 raw_spin_unlock_irqrestore(&events->pmu_lock, flags);
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WD		 568}
569
570static int
571armv6pmu_get_event_idx(struct cpu_hw_events *cpuc,
572 struct hw_perf_event *event)
573{
574 /* Always place a cycle counter into the cycle counter. */
575 if (ARMV6_PERFCTR_CPU_CYCLES == event->config_base) {
576 if (test_and_set_bit(ARMV6_CYCLE_COUNTER, cpuc->used_mask))
577 return -EAGAIN;
578
579 return ARMV6_CYCLE_COUNTER;
580 } else {
581 /*
582 * For anything other than a cycle counter, try and use
583 * counter0 and counter1.
584 */
585 if (!test_and_set_bit(ARMV6_COUNTER1, cpuc->used_mask))
586 return ARMV6_COUNTER1;
587
588 if (!test_and_set_bit(ARMV6_COUNTER0, cpuc->used_mask))
589 return ARMV6_COUNTER0;
590
591 /* The counters are all in use. */
592 return -EAGAIN;
593 }
594}
595
596static void
597armv6pmu_disable_event(struct hw_perf_event *hwc,
598 int idx)
599{
600 unsigned long val, mask, evt, flags;
0f78d2d5 601 struct cpu_hw_events *events = armpmu->get_hw_events();
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WD		 602
603 if (ARMV6_CYCLE_COUNTER == idx) {
604 mask = ARMV6_PMCR_CCOUNT_IEN;
605 evt = 0;
606 } else if (ARMV6_COUNTER0 == idx) {
607 mask = ARMV6_PMCR_COUNT0_IEN | ARMV6_PMCR_EVT_COUNT0_MASK;
608 evt = ARMV6_PERFCTR_NOP << ARMV6_PMCR_EVT_COUNT0_SHIFT;
609 } else if (ARMV6_COUNTER1 == idx) {
610 mask = ARMV6_PMCR_COUNT1_IEN | ARMV6_PMCR_EVT_COUNT1_MASK;
611 evt = ARMV6_PERFCTR_NOP << ARMV6_PMCR_EVT_COUNT1_SHIFT;
612 } else {
613 WARN_ONCE(1, "invalid counter number (%d)\n", idx);
614 return;
615 }
616
617 /*
618 * Mask out the current event and set the counter to count the number
619 * of ETM bus signal assertion cycles. The external reporting should
620 * be disabled and so this should never increment.
621 */
0f78d2d5 622 raw_spin_lock_irqsave(&events->pmu_lock, flags);
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WD		 623 val = armv6_pmcr_read();
624 val &= ~mask;
625 val |= evt;
626 armv6_pmcr_write(val);
0f78d2d5 627 raw_spin_unlock_irqrestore(&events->pmu_lock, flags);
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WD		 628}
629
630static void
631armv6mpcore_pmu_disable_event(struct hw_perf_event *hwc,
632 int idx)
633{
634 unsigned long val, mask, flags, evt = 0;
0f78d2d5 635 struct cpu_hw_events *events = armpmu->get_hw_events();
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WD		 636
637 if (ARMV6_CYCLE_COUNTER == idx) {
638 mask = ARMV6_PMCR_CCOUNT_IEN;
639 } else if (ARMV6_COUNTER0 == idx) {
640 mask = ARMV6_PMCR_COUNT0_IEN;
641 } else if (ARMV6_COUNTER1 == idx) {
642 mask = ARMV6_PMCR_COUNT1_IEN;
643 } else {
644 WARN_ONCE(1, "invalid counter number (%d)\n", idx);
645 return;
646 }
647
648 /*
649 * Unlike UP ARMv6, we don't have a way of stopping the counters. We
650 * simply disable the interrupt reporting.
651 */
0f78d2d5 652 raw_spin_lock_irqsave(&events->pmu_lock, flags);
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WD		 653 val = armv6_pmcr_read();
654 val &= ~mask;
655 val |= evt;
656 armv6_pmcr_write(val);
0f78d2d5 657 raw_spin_unlock_irqrestore(&events->pmu_lock, flags);
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WD		 658}
659
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MR		 660static int armv6_map_event(struct perf_event *event)
661{
662 return map_cpu_event(event, &armv6_perf_map,
663 &armv6_perf_cache_map, 0xFF);
664}
665
a6c93afe 666static struct arm_pmu armv6pmu = {
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WD		 667 .id = ARM_PERF_PMU_ID_V6,
668 .name = "v6",
669 .handle_irq = armv6pmu_handle_irq,
670 .enable = armv6pmu_enable_event,
671 .disable = armv6pmu_disable_event,
672 .read_counter = armv6pmu_read_counter,
673 .write_counter = armv6pmu_write_counter,
674 .get_event_idx = armv6pmu_get_event_idx,
675 .start = armv6pmu_start,
676 .stop = armv6pmu_stop,
e1f431b5 677 .map_event = armv6_map_event,
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WD		 678 .num_events = 3,
679 .max_period = (1LLU << 32) - 1,
680};
681
a6c93afe 682static struct arm_pmu *__init armv6pmu_init(void)
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WD		 683{
684 return &armv6pmu;
685}
686
687/*
688 * ARMv6mpcore is almost identical to single core ARMv6 with the exception
689 * that some of the events have different enumerations and that there is no
690 * *hack* to stop the programmable counters. To stop the counters we simply
691 * disable the interrupt reporting and update the event. When unthrottling we
692 * reset the period and enable the interrupt reporting.
693 */
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MR		 694
695static int armv6mpcore_map_event(struct perf_event *event)
696{
697 return map_cpu_event(event, &armv6mpcore_perf_map,
698 &armv6mpcore_perf_cache_map, 0xFF);
699}
700
a6c93afe 701static struct arm_pmu armv6mpcore_pmu = {
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WD		 702 .id = ARM_PERF_PMU_ID_V6MP,
703 .name = "v6mpcore",
704 .handle_irq = armv6pmu_handle_irq,
705 .enable = armv6pmu_enable_event,
706 .disable = armv6mpcore_pmu_disable_event,
707 .read_counter = armv6pmu_read_counter,
708 .write_counter = armv6pmu_write_counter,
709 .get_event_idx = armv6pmu_get_event_idx,
710 .start = armv6pmu_start,
711 .stop = armv6pmu_stop,
e1f431b5 712 .map_event = armv6mpcore_map_event,
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WD		 713 .num_events = 3,
714 .max_period = (1LLU << 32) - 1,
715};
716
a6c93afe 717static struct arm_pmu *__init armv6mpcore_pmu_init(void)
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WD		 718{
719 return &armv6mpcore_pmu;
720}
721#else
a6c93afe 722static struct arm_pmu *__init armv6pmu_init(void)
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WD		 723{
724 return NULL;
725}
726
a6c93afe 727static struct arm_pmu *__init armv6mpcore_pmu_init(void)
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WD		 728{
729 return NULL;
730}
e399b1a4 731#endif /* CONFIG_CPU_V6 || CONFIG_CPU_V6K */
kernel source for telekom puls (alcatel/mediatek)