aboutsummaryrefslogtreecommitdiff
path: root/driver/gator_events_armv7.c
blob: 5a3268fb0e994353628920bcca4582c1ccdcb041 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
/**
 * Copyright (C) ARM Limited 2010-2011. All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include "gator.h"

#if defined(__arm__)

#define CORTEX_A8	0xc08
#define CORTEX_A9	0xc09

static const char *pmnc_name;
static int pmnc_count;

extern u32 gator_cpuid(void);

/*
 * Per-CPU PMNC: config reg
 */
#define PMNC_E		(1 << 0)	/* Enable all counters */
#define PMNC_P		(1 << 1)	/* Reset all counters */
#define PMNC_C		(1 << 2)	/* Cycle counter reset */
#define PMNC_D		(1 << 3)	/* CCNT counts every 64th cpu cycle */
#define PMNC_X		(1 << 4)	/* Export to ETM */
#define PMNC_DP		(1 << 5)	/* Disable CCNT if non-invasive debug*/
#define	PMNC_MASK	0x3f		/* Mask for writable bits */

/*
 * CNTENS: counters enable reg
 */
#define CNTENS_P0	(1 << 0)
#define CNTENS_P1	(1 << 1)
#define CNTENS_P2	(1 << 2)
#define CNTENS_P3	(1 << 3)
#define CNTENS_C	(1 << 31)
#define	CNTENS_MASK	0x8000000f	/* Mask for writable bits */

/*
 * CNTENC: counters disable reg
 */
#define CNTENC_P0	(1 << 0)
#define CNTENC_P1	(1 << 1)
#define CNTENC_P2	(1 << 2)
#define CNTENC_P3	(1 << 3)
#define CNTENC_C	(1 << 31)
#define	CNTENC_MASK	0x8000000f	/* Mask for writable bits */

/*
 * INTENS: counters overflow interrupt enable reg
 */
#define INTENS_P0	(1 << 0)
#define INTENS_P1	(1 << 1)
#define INTENS_P2	(1 << 2)
#define INTENS_P3	(1 << 3)
#define INTENS_C	(1 << 31)
#define	INTENS_MASK	0x8000000f	/* Mask for writable bits */

/*
 * EVTSEL: Event selection reg
 */
#define	EVTSEL_MASK	0x7f		/* Mask for writable bits */

/*
 * SELECT: Counter selection reg
 */
#define	SELECT_MASK	0x1f		/* Mask for writable bits */

/*
 * FLAG: counters overflow flag status reg
 */
#define FLAG_P0		(1 << 0)
#define FLAG_P1		(1 << 1)
#define FLAG_P2		(1 << 2)
#define FLAG_P3		(1 << 3)
#define FLAG_C		(1 << 31)
#define	FLAG_MASK	0x8000000f	/* Mask for writable bits */

#define CCNT 		0
#define CNT0		1
#define CNTMAX 		(6+1)

static unsigned long pmnc_enabled[CNTMAX];
static unsigned long pmnc_event[CNTMAX];
static unsigned long pmnc_key[CNTMAX];

static DEFINE_PER_CPU(int[CNTMAX], perfPrev);
static DEFINE_PER_CPU(int[CNTMAX * 2], perfCnt);

static inline void armv7_pmnc_write(u32 val)
{
	val &= PMNC_MASK;
	asm volatile("mcr p15, 0, %0, c9, c12, 0" : : "r" (val));
}

static inline u32 armv7_pmnc_read(void)
{
	u32 val;
	asm volatile("mrc p15, 0, %0, c9, c12, 0" : "=r" (val));
	return val;
}

static inline u32 armv7_ccnt_read(void)
{
	u32 val;
	asm volatile("mrc p15, 0, %0, c9, c13, 0" : "=r" (val));
	return val;
}

static inline u32 armv7_cntn_read(void)
{
	u32 val;
	asm volatile("mrc p15, 0, %0, c9, c13, 2" : "=r" (val));
	return val;
}

static inline u32 armv7_pmnc_enable_counter(unsigned int cnt)
{
	u32 val;

	if (cnt >= CNTMAX) {
		pr_err("gator: CPU%u enabling wrong PMNC counter %d\n", smp_processor_id(), cnt);
		return -1;
	}

	if (cnt == CCNT)
		val = CNTENS_C;
	else
		val = (1 << (cnt - CNT0));

	val &= CNTENS_MASK;
	asm volatile("mcr p15, 0, %0, c9, c12, 1" : : "r" (val));

	return cnt;
}

static inline u32 armv7_pmnc_disable_counter(unsigned int cnt)
{
	u32 val;

	if (cnt >= CNTMAX) {
		pr_err("gator: CPU%u disabling wrong PMNC counter %d\n", smp_processor_id(), cnt);
		return -1;
	}

	if (cnt == CCNT)
		val = CNTENC_C;
	else
		val = (1 << (cnt - CNT0));

	val &= CNTENC_MASK;
	asm volatile("mcr p15, 0, %0, c9, c12, 2" : : "r" (val));

	return cnt;
}

static inline u32 armv7_pmnc_enable_intens(unsigned int cnt)
{
	u32 val;

	if (cnt >= CNTMAX) {
		pr_err("gator: CPU%u enabling wrong PMNC counter interrupt enable %d\n", smp_processor_id(), cnt);
		return -1;
	}

	if (cnt == CCNT)
		val = INTENS_C;
	else
		val = (1 << (cnt - CNT0));

	val &= INTENS_MASK;
	asm volatile("mcr p15, 0, %0, c9, c14, 1" : : "r" (val));

	return cnt;
}

static inline u32 armv7_pmnc_getreset_flags(void)
{
	u32 val;

	/* Read */
	asm volatile("mrc p15, 0, %0, c9, c12, 3" : "=r" (val));

	/* Write to clear flags */
	val &= FLAG_MASK;
	asm volatile("mcr p15, 0, %0, c9, c12, 3" : : "r" (val));

	return val;
}

static inline int armv7_pmnc_select_counter(unsigned int cnt)
{
	u32 val;

	if ((cnt == CCNT) || (cnt >= CNTMAX)) {
		pr_err("gator: CPU%u selecting wrong PMNC counter %d\n", smp_processor_id(), cnt);
		return -1;
	}

	val = (cnt - CNT0) & SELECT_MASK;
	asm volatile("mcr p15, 0, %0, c9, c12, 5" : : "r" (val));

	return cnt;
}

static inline void armv7_pmnc_write_evtsel(unsigned int cnt, u32 val)
{
	if (armv7_pmnc_select_counter(cnt) == cnt) {
		val &= EVTSEL_MASK;
		asm volatile("mcr p15, 0, %0, c9, c13, 1" : : "r" (val));
	}
}

static void armv7_pmnc_reset_counter(unsigned int cnt)
{
	u32 val = 0;

	if (cnt == CCNT) {
		armv7_pmnc_disable_counter(cnt);

		asm volatile("mcr p15, 0, %0, c9, c13, 0" : : "r" (val));

		if (pmnc_enabled[cnt] != 0)
		    armv7_pmnc_enable_counter(cnt);

	} else if (cnt >= CNTMAX) {
		pr_err("gator: CPU%u resetting wrong PMNC counter %d\n", smp_processor_id(), cnt);
	} else {
		armv7_pmnc_disable_counter(cnt);

		if (armv7_pmnc_select_counter(cnt) == cnt)
		    asm volatile("mcr p15, 0, %0, c9, c13, 2" : : "r" (val));

		if (pmnc_enabled[cnt] != 0)
		    armv7_pmnc_enable_counter(cnt);
	}
}

static int gator_events_armv7_create_files(struct super_block *sb, struct dentry *root)
{
	struct dentry *dir;
	int i;

	for (i = 0; i < pmnc_count; i++) {
		char buf[40];
		if (i == 0) {
			snprintf(buf, sizeof buf, "ARM_%s_ccnt", pmnc_name);
		} else {
			snprintf(buf, sizeof buf, "ARM_%s_cnt%d", pmnc_name, i-1);
		}
		dir = gatorfs_mkdir(sb, root, buf);
		if (!dir) {
			return -1;
		}
		gatorfs_create_ulong(sb, dir, "enabled", &pmnc_enabled[i]);
		if (i > 0) {
			gatorfs_create_ulong(sb, dir, "event", &pmnc_event[i]);
		}
		gatorfs_create_ro_ulong(sb, dir, "key", &pmnc_key[i]);
	}

	return 0;
}

static int gator_events_armv7_init(int *key)
{
	unsigned int cnt;

	for (cnt = CCNT; cnt < CNTMAX; cnt++) {
		pmnc_enabled[cnt] = 0;
		pmnc_event[cnt] = 0;
		pmnc_key[cnt] = *key;
		*key = *key + 1;
	}

	return 0;
}

static void gator_events_armv7_online(void)
{
	unsigned int cnt;

	if (armv7_pmnc_read() & PMNC_E) {
		armv7_pmnc_write(armv7_pmnc_read() & ~PMNC_E);
	}

	/* Initialize & Reset PMNC: C bit and P bit */
	armv7_pmnc_write(PMNC_P | PMNC_C);

	for (cnt = CCNT; cnt < CNTMAX; cnt++) {
		unsigned long event;

		per_cpu(perfPrev, raw_smp_processor_id())[cnt] = 0;

		if (!pmnc_enabled[cnt])
			continue;

		/*
		 * Disable counter
		 */
		armv7_pmnc_disable_counter(cnt);

		event = pmnc_event[cnt] & 255;

		/*
		 * Set event (if destined for PMNx counters)
		 * We don't need to set the event if it's a cycle count
		 */
		if (cnt != CCNT)
			armv7_pmnc_write_evtsel(cnt, event);

		/*
		 * [Do not] Enable interrupt for this counter
		 */
		/* armv7_pmnc_enable_intens(cnt); */

		/*
		 * Reset counter
		 */
		armv7_pmnc_reset_counter(cnt);

		/*
		 * Enable counter
		 */
		armv7_pmnc_enable_counter(cnt);
	}

	// enable
	armv7_pmnc_write(armv7_pmnc_read() | PMNC_E);
}

static void gator_events_armv7_offline(void)
{
	armv7_pmnc_write(armv7_pmnc_read() & ~PMNC_E);
}

static void gator_events_armv7_stop(void)
{
	unsigned int cnt;

	for (cnt = CCNT; cnt < CNTMAX; cnt++) {
		pmnc_enabled[cnt] = 0;
		pmnc_event[cnt] = 0;
	}
}

static int gator_events_armv7_read(int **buffer)
{
	int cnt, len = 0;
	int cpu = raw_smp_processor_id();

	if (!pmnc_count)
		return 0;

	armv7_pmnc_getreset_flags();
	for (cnt = 0; cnt < pmnc_count; cnt++) {
		if (pmnc_enabled[cnt]) {
			int value;
			if (cnt == CCNT) {
				value = armv7_ccnt_read();
			} else if (armv7_pmnc_select_counter(cnt) == cnt) {
				value = armv7_cntn_read();
			} else {
				value = 0;
			}
			armv7_pmnc_reset_counter(cnt);
			if (value != per_cpu(perfPrev, cpu)[cnt]) {
				per_cpu(perfPrev, cpu)[cnt] = value;
				per_cpu(perfCnt, cpu)[len++] = pmnc_key[cnt];
				per_cpu(perfCnt, cpu)[len++] = value;
			}
		}
	}

	// update or discard
	if (buffer)
		*buffer = per_cpu(perfCnt, cpu);

	return len;
}
#endif

int gator_events_armv7_install(gator_interface *gi) {
#if defined(__arm__)
	switch (gator_cpuid()) {
	case CORTEX_A8:
		pmnc_name = "Cortex-A8";
		pmnc_count = 4;
		break;
	case CORTEX_A9:
		pmnc_name = "Cortex-A9";
		pmnc_count = 6;
		break;
	default:
		return -1;
	}

	pmnc_count++; // CNT[n] + CCNT

	gi->create_files = gator_events_armv7_create_files;
	gi->init = gator_events_armv7_init;
	gi->stop = gator_events_armv7_stop;
	gi->online = gator_events_armv7_online;
	gi->offline = gator_events_armv7_offline;
	gi->read = gator_events_armv7_read;
#endif
	return 0;
}