aboutsummaryrefslogtreecommitdiffstats
path: root/arch/powerpc/kernel/power7-pmu.c
blob: 018d094d92f91d2af529f0eff119f3b3f27983ef (plain) (blame)
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
/*
 * Performance counter support for POWER7 processors.
 *
 * Copyright 2009 Paul Mackerras, IBM Corporation.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version
 * 2 of the License, or (at your option) any later version.
 */
#include <linux/kernel.h>
#include <linux/perf_counter.h>
#include <linux/string.h>
#include <asm/reg.h>
#include <asm/cputable.h>

/*
 * Bits in event code for POWER7
 */
#define PM_PMC_SH	16	/* PMC number (1-based) for direct events */
#define PM_PMC_MSK	0xf
#define PM_PMC_MSKS	(PM_PMC_MSK << PM_PMC_SH)
#define PM_UNIT_SH	12	/* TTMMUX number and setting - unit select */
#define PM_UNIT_MSK	0xf
#define PM_COMBINE_SH	11	/* Combined event bit */
#define PM_COMBINE_MSK	1
#define PM_COMBINE_MSKS	0x800
#define PM_L2SEL_SH	8	/* L2 event select */
#define PM_L2SEL_MSK	7
#define PM_PMCSEL_MSK	0xff

/*
 * Bits in MMCR1 for POWER7
 */
#define MMCR1_TTM0SEL_SH	60
#define MMCR1_TTM1SEL_SH	56
#define MMCR1_TTM2SEL_SH	52
#define MMCR1_TTM3SEL_SH	48
#define MMCR1_TTMSEL_MSK	0xf
#define MMCR1_L2SEL_SH		45
#define MMCR1_L2SEL_MSK		7
#define MMCR1_PMC1_COMBINE_SH	35
#define MMCR1_PMC2_COMBINE_SH	34
#define MMCR1_PMC3_COMBINE_SH	33
#define MMCR1_PMC4_COMBINE_SH	32
#define MMCR1_PMC1SEL_SH	24
#define MMCR1_PMC2SEL_SH	16
#define MMCR1_PMC3SEL_SH	8
#define MMCR1_PMC4SEL_SH	0
#define MMCR1_PMCSEL_SH(n)	(MMCR1_PMC1SEL_SH - (n) * 8)
#define MMCR1_PMCSEL_MSK	0xff

/*
 * Bits in MMCRA
 */

/*
 * Layout of constraint bits:
 * 6666555555555544444444443333333333222222222211111111110000000000
 * 3210987654321098765432109876543210987654321098765432109876543210
 *                                                 [  ><><><><><><>
 *                                                  NC P6P5P4P3P2P1
 *
 * NC - number of counters
 *     15: NC error 0x8000
 *     12-14: number of events needing PMC1-4 0x7000
 *
 * P6
 *     11: P6 error 0x800
 *     10-11: Count of events needing PMC6
 *
 * P1..P5
 *     0-9: Count of events needing PMC1..PMC5
 */

static int power7_get_constraint(u64 event, unsigned long *maskp,
				 unsigned long *valp)
{
	int pmc, sh;
	unsigned long mask = 0, value = 0;

	pmc = (event >> PM_PMC_SH) & PM_PMC_MSK;
	if (pmc) {
		if (pmc > 6)
			return -1;
		sh = (pmc - 1) * 2;
		mask |= 2 << sh;
		value |= 1 << sh;
		if (pmc >= 5 && !(event == 0x500fa || event == 0x600f4))
			return -1;
	}
	if (pmc < 5) {
		/* need a counter from PMC1-4 set */
		mask  |= 0x8000;
		value |= 0x1000;
	}
	*maskp = mask;
	*valp = value;
	return 0;
}

#define MAX_ALT	2	/* at most 2 alternatives for any event */

static const unsigned int event_alternatives[][MAX_ALT] = {
	{ 0x200f2, 0x300f2 },		/* PM_INST_DISP */
	{ 0x200f4, 0x600f4 },		/* PM_RUN_CYC */
	{ 0x400fa, 0x500fa },		/* PM_RUN_INST_CMPL */
};

/*
 * Scan the alternatives table for a match and return the
 * index into the alternatives table if found, else -1.
 */
static int find_alternative(u64 event)
{
	int i, j;

	for (i = 0; i < ARRAY_SIZE(event_alternatives); ++i) {
		if (event < event_alternatives[i][0])
			break;
		for (j = 0; j < MAX_ALT && event_alternatives[i][j]; ++j)
			if (event == event_alternatives[i][j])
				return i;
	}
	return -1;
}

static s64 find_alternative_decode(u64 event)
{
	int pmc, psel;

	/* this only handles the 4x decode events */
	pmc = (event >> PM_PMC_SH) & PM_PMC_MSK;
	psel = event & PM_PMCSEL_MSK;
	if ((pmc == 2 || pmc == 4) && (psel & ~7) == 0x40)
		return event - (1 << PM_PMC_SH) + 8;
	if ((pmc == 1 || pmc == 3) && (psel & ~7) == 0x48)
		return event + (1 << PM_PMC_SH) - 8;
	return -1;
}

static int power7_get_alternatives(u64 event, unsigned int flags, u64 alt[])
{
	int i, j, nalt = 1;
	s64 ae;

	alt[0] = event;
	nalt = 1;
	i = find_alternative(event);
	if (i >= 0) {
		for (j = 0; j < MAX_ALT; ++j) {
			ae = event_alternatives[i][j];
			if (ae && ae != event)
				alt[nalt++] = ae;
		}
	} else {
		ae = find_alternative_decode(event);
		if (ae > 0)
			alt[nalt++] = ae;
	}

	if (flags & PPMU_ONLY_COUNT_RUN) {
		/*
		 * We're only counting in RUN state,
		 * so PM_CYC is equivalent to PM_RUN_CYC
		 * and PM_INST_CMPL === PM_RUN_INST_CMPL.
		 * This doesn't include alternatives that don't provide
		 * any extra flexibility in assigning PMCs.
		 */
		j = nalt;
		for (i = 0; i < nalt; ++i) {
			switch (alt[i]) {
			case 0x1e:	/* PM_CYC */
				alt[j++] = 0x600f4;	/* PM_RUN_CYC */
				break;
			case 0x600f4:	/* PM_RUN_CYC */
				alt[j++] = 0x1e;
				break;
			case 0x2:	/* PM_PPC_CMPL */
				alt[j++] = 0x500fa;	/* PM_RUN_INST_CMPL */
				break;
			case 0x500fa:	/* PM_RUN_INST_CMPL */
				alt[j++] = 0x2;	/* PM_PPC_CMPL */
				break;
			}
		}
		nalt = j;
	}

	return nalt;
}

/*
 * Returns 1 if event counts things relating to marked instructions
 * and thus needs the MMCRA_SAMPLE_ENABLE bit set, or 0 if not.
 */
static int power7_marked_instr_event(u64 event)
{
	int pmc, psel;
	int unit;

	pmc = (event >> PM_PMC_SH) & PM_PMC_MSK;
	unit = (event >> PM_UNIT_SH) & PM_UNIT_MSK;
	psel = event & PM_PMCSEL_MSK & ~1;	/* trim off edge/level bit */
	if (pmc >= 5)
		return 0;

	switch (psel >> 4) {
	case 2:
		return pmc == 2 || pmc == 4;
	case 3:
		if (psel == 0x3c)
			return pmc == 1;
		if (psel == 0x3e)
			return pmc != 2;
		return 1;
	case 4:
	case 5:
		return unit == 0xd;
	case 6:
		if (psel == 0x64)
			return pmc >= 3;
	case 8:
		return unit == 0xd;
	}
	return 0;
}

static int power7_compute_mmcr(u64 event[], int n_ev,
			       unsigned int hwc[], unsigned long mmcr[])
{
	unsigned long mmcr1 = 0;
	unsigned long mmcra = 0;
	unsigned int pmc, unit, combine, l2sel, psel;
	unsigned int pmc_inuse = 0;
	int i;

	/* First pass to count resource use */
	for (i = 0; i < n_ev; ++i) {
		pmc = (event[i] >> PM_PMC_SH) & PM_PMC_MSK;
		if (pmc) {
			if (pmc > 6)
				return -1;
			if (pmc_inuse & (1 << (pmc - 1)))
				return -1;
			pmc_inuse |= 1 << (pmc - 1);
		}
	}

	/* Second pass: assign PMCs, set all MMCR1 fields */
	for (i = 0; i < n_ev; ++i) {
		pmc = (event[i] >> PM_PMC_SH) & PM_PMC_MSK;
		unit = (event[i] >> PM_UNIT_SH) & PM_UNIT_MSK;
		combine = (event[i] >> PM_COMBINE_SH) & PM_COMBINE_MSK;
		l2sel = (event[i] >> PM_L2SEL_SH) & PM_L2SEL_MSK;
		psel = event[i] & PM_PMCSEL_MSK;
		if (!pmc) {
			/* Bus event or any-PMC direct event */
			for (pmc = 0; pmc < 4; ++pmc) {
				if (!(pmc_inuse & (1 << pmc)))
					break;
			}
			if (pmc >= 4)
				return -1;
			pmc_inuse |= 1 << pmc;
		} else {
			/* Direct or decoded event */
			--pmc;
		}
		if (pmc <= 3) {
			mmcr1 |= (unsigned long) unit
				<< (MMCR1_TTM0SEL_SH - 4 * pmc);
			mmcr1 |= (unsigned long) combine
				<< (MMCR1_PMC1_COMBINE_SH - pmc);
			mmcr1 |= psel << MMCR1_PMCSEL_SH(pmc);
			if (unit == 6)	/* L2 events */
				mmcr1 |= (unsigned long) l2sel
					<< MMCR1_L2SEL_SH;
		}
		if (power7_marked_instr_event(event[i]))
			mmcra |= MMCRA_SAMPLE_ENABLE;
		hwc[i] = pmc;
	}

	/* Return MMCRx values */
	mmcr[0] = 0;
	if (pmc_inuse & 1)
		mmcr[0] = MMCR0_PMC1CE;
	if (pmc_inuse & 0x3e)
		mmcr[0] |= MMCR0_PMCjCE;
	mmcr[1] = mmcr1;
	mmcr[2] = mmcra;
	return 0;
}

static void power7_disable_pmc(unsigned int pmc, unsigned long mmcr[])
{
	if (pmc <= 3)
		mmcr[1] &= ~(0xffUL << MMCR1_PMCSEL_SH(pmc));
}

static int power7_generic_events[] = {
	[PERF_COUNT_HW_CPU_CYCLES] = 0x1e,
	[PERF_COUNT_HW_INSTRUCTIONS] = 2,
	[PERF_COUNT_HW_CACHE_REFERENCES] = 0xc880,	/* LD_REF_L1_LSU*/
	[PERF_COUNT_HW_CACHE_MISSES] = 0x400f0,		/* LD_MISS_L1	*/
	[PERF_COUNT_HW_BRANCH_INSTRUCTIONS] = 0x10068,	/* BRU_FIN	*/
	[PERF_COUNT_HW_BRANCH_MISSES] = 0x400f6,	/* BR_MPRED	*/
};

#define C(x)	PERF_COUNT_HW_CACHE_##x

/*
 * Table of generalized cache-related events.
 * 0 means not supported, -1 means nonsensical, other values
 * are event codes.
 */
static int power7_cache_events[C(MAX)][C(OP_MAX)][C(RESULT_MAX)] = {
	[C(L1D)] = {		/* 	RESULT_ACCESS	RESULT_MISS */
		[C(OP_READ)] = {	0xc880,		0x400f0	},
		[C(OP_WRITE)] = {	0,		0x300f0	},
		[C(OP_PREFETCH)] = {	0xd8b8,		0	},
	},
	[C(L1I)] = {		/* 	RESULT_ACCESS	RESULT_MISS */
		[C(OP_READ)] = {	0,		0x200fc	},
		[C(OP_WRITE)] = {	-1,		-1	},
		[C(OP_PREFETCH)] = {	0x408a,		0	},
	},
	[C(LL)] = {		/* 	RESULT_ACCESS	RESULT_MISS */
		[C(OP_READ)] = {	0x16080,	0x26080	},
		[C(OP_WRITE)] = {	0x16082,	0x26082	},
		[C(OP_PREFETCH)] = {	0,		0	},
	},
	[C(DTLB)] = {		/* 	RESULT_ACCESS	RESULT_MISS */
		[C(OP_READ)] = {	0,		0x300fc	},
		[C(OP_WRITE)] = {	-1,		-1	},
		[C(OP_PREFETCH)] = {	-1,		-1	},
	},
	[C(ITLB)] = {		/* 	RESULT_ACCESS	RESULT_MISS */
		[C(OP_READ)] = {	0,		0x400fc	},
		[C(OP_WRITE)] = {	-1,		-1	},
		[C(OP_PREFETCH)] = {	-1,		-1	},
	},
	[C(BPU)] = {		/* 	RESULT_ACCESS	RESULT_MISS */
		[C(OP_READ)] = {	0x10068,	0x400f6	},
		[C(OP_WRITE)] = {	-1,		-1	},
		[C(OP_PREFETCH)] = {	-1,		-1	},
	},
};

static struct power_pmu power7_pmu = {
	.name			= "POWER7",
	.n_counter		= 6,
	.max_alternatives	= MAX_ALT + 1,
	.add_fields		= 0x1555ul,
	.test_adder		= 0x3000ul,
	.compute_mmcr		= power7_compute_mmcr,
	.get_constraint		= power7_get_constraint,
	.get_alternatives	= power7_get_alternatives,
	.disable_pmc		= power7_disable_pmc,
	.flags			= PPMU_ALT_SIPR,
	.n_generic		= ARRAY_SIZE(power7_generic_events),
	.generic_events		= power7_generic_events,
	.cache_events		= &power7_cache_events,
};

static int init_power7_pmu(void)
{
	if (!cur_cpu_spec->oprofile_cpu_type ||
	    strcmp(cur_cpu_spec->oprofile_cpu_type, "ppc64/power7"))
		return -ENODEV;

	return register_power_pmu(&power7_pmu);
}

arch_initcall(init_power7_pmu);