xref: /openbmc/linux/arch/powerpc/perf/ppc970-pmu.c (revision ec3eb9d9)
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * Performance counter support for PPC970-family processors.
4  *
5  * Copyright 2008-2009 Paul Mackerras, IBM Corporation.
6  */
7 #include <linux/string.h>
8 #include <linux/perf_event.h>
9 #include <asm/reg.h>
10 #include <asm/cputable.h>
11 
12 #include "internal.h"
13 
14 /*
15  * Bits in event code for PPC970
16  */
17 #define PM_PMC_SH	12	/* PMC number (1-based) for direct events */
18 #define PM_PMC_MSK	0xf
19 #define PM_UNIT_SH	8	/* TTMMUX number and setting - unit select */
20 #define PM_UNIT_MSK	0xf
21 #define PM_SPCSEL_SH	6
22 #define PM_SPCSEL_MSK	3
23 #define PM_BYTE_SH	4	/* Byte number of event bus to use */
24 #define PM_BYTE_MSK	3
25 #define PM_PMCSEL_MSK	0xf
26 
27 /* Values in PM_UNIT field */
28 #define PM_NONE		0
29 #define PM_FPU		1
30 #define PM_VPU		2
31 #define PM_ISU		3
32 #define PM_IFU		4
33 #define PM_IDU		5
34 #define PM_STS		6
35 #define PM_LSU0		7
36 #define PM_LSU1U	8
37 #define PM_LSU1L	9
38 #define PM_LASTUNIT	9
39 
40 /*
41  * Bits in MMCR0 for PPC970
42  */
43 #define MMCR0_PMC1SEL_SH	8
44 #define MMCR0_PMC2SEL_SH	1
45 #define MMCR_PMCSEL_MSK		0x1f
46 
47 /*
48  * Bits in MMCR1 for PPC970
49  */
50 #define MMCR1_TTM0SEL_SH	62
51 #define MMCR1_TTM1SEL_SH	59
52 #define MMCR1_TTM3SEL_SH	53
53 #define MMCR1_TTMSEL_MSK	3
54 #define MMCR1_TD_CP_DBG0SEL_SH	50
55 #define MMCR1_TD_CP_DBG1SEL_SH	48
56 #define MMCR1_TD_CP_DBG2SEL_SH	46
57 #define MMCR1_TD_CP_DBG3SEL_SH	44
58 #define MMCR1_PMC1_ADDER_SEL_SH	39
59 #define MMCR1_PMC2_ADDER_SEL_SH	38
60 #define MMCR1_PMC6_ADDER_SEL_SH	37
61 #define MMCR1_PMC5_ADDER_SEL_SH	36
62 #define MMCR1_PMC8_ADDER_SEL_SH	35
63 #define MMCR1_PMC7_ADDER_SEL_SH	34
64 #define MMCR1_PMC3_ADDER_SEL_SH	33
65 #define MMCR1_PMC4_ADDER_SEL_SH	32
66 #define MMCR1_PMC3SEL_SH	27
67 #define MMCR1_PMC4SEL_SH	22
68 #define MMCR1_PMC5SEL_SH	17
69 #define MMCR1_PMC6SEL_SH	12
70 #define MMCR1_PMC7SEL_SH	7
71 #define MMCR1_PMC8SEL_SH	2
72 
73 static short mmcr1_adder_bits[8] = {
74 	MMCR1_PMC1_ADDER_SEL_SH,
75 	MMCR1_PMC2_ADDER_SEL_SH,
76 	MMCR1_PMC3_ADDER_SEL_SH,
77 	MMCR1_PMC4_ADDER_SEL_SH,
78 	MMCR1_PMC5_ADDER_SEL_SH,
79 	MMCR1_PMC6_ADDER_SEL_SH,
80 	MMCR1_PMC7_ADDER_SEL_SH,
81 	MMCR1_PMC8_ADDER_SEL_SH
82 };
83 
84 /*
85  * Layout of constraint bits:
86  * 6666555555555544444444443333333333222222222211111111110000000000
87  * 3210987654321098765432109876543210987654321098765432109876543210
88  *               <><><>[  >[  >[  ><  ><  ><  ><  ><><><><><><><><>
89  *               SPT0T1 UC  PS1 PS2 B0  B1  B2  B3 P1P2P3P4P5P6P7P8
90  *
91  * SP - SPCSEL constraint
92  *     48-49: SPCSEL value 0x3_0000_0000_0000
93  *
94  * T0 - TTM0 constraint
95  *     46-47: TTM0SEL value (0=FPU, 2=IFU, 3=VPU) 0xC000_0000_0000
96  *
97  * T1 - TTM1 constraint
98  *     44-45: TTM1SEL value (0=IDU, 3=STS) 0x3000_0000_0000
99  *
100  * UC - unit constraint: can't have all three of FPU|IFU|VPU, ISU, IDU|STS
101  *     43: UC3 error 0x0800_0000_0000
102  *     42: FPU|IFU|VPU events needed 0x0400_0000_0000
103  *     41: ISU events needed 0x0200_0000_0000
104  *     40: IDU|STS events needed 0x0100_0000_0000
105  *
106  * PS1
107  *     39: PS1 error 0x0080_0000_0000
108  *     36-38: count of events needing PMC1/2/5/6 0x0070_0000_0000
109  *
110  * PS2
111  *     35: PS2 error 0x0008_0000_0000
112  *     32-34: count of events needing PMC3/4/7/8 0x0007_0000_0000
113  *
114  * B0
115  *     28-31: Byte 0 event source 0xf000_0000
116  *	      Encoding as for the event code
117  *
118  * B1, B2, B3
119  *     24-27, 20-23, 16-19: Byte 1, 2, 3 event sources
120  *
121  * P1
122  *     15: P1 error 0x8000
123  *     14-15: Count of events needing PMC1
124  *
125  * P2..P8
126  *     0-13: Count of events needing PMC2..PMC8
127  */
128 
129 static unsigned char direct_marked_event[8] = {
130 	(1<<2) | (1<<3),	/* PMC1: PM_MRK_GRP_DISP, PM_MRK_ST_CMPL */
131 	(1<<3) | (1<<5),	/* PMC2: PM_THRESH_TIMEO, PM_MRK_BRU_FIN */
132 	(1<<3) | (1<<5),	/* PMC3: PM_MRK_ST_CMPL_INT, PM_MRK_VMX_FIN */
133 	(1<<4) | (1<<5),	/* PMC4: PM_MRK_GRP_CMPL, PM_MRK_CRU_FIN */
134 	(1<<4) | (1<<5),	/* PMC5: PM_GRP_MRK, PM_MRK_GRP_TIMEO */
135 	(1<<3) | (1<<4) | (1<<5),
136 		/* PMC6: PM_MRK_ST_STS, PM_MRK_FXU_FIN, PM_MRK_GRP_ISSUED */
137 	(1<<4) | (1<<5),	/* PMC7: PM_MRK_FPU_FIN, PM_MRK_INST_FIN */
138 	(1<<4)			/* PMC8: PM_MRK_LSU_FIN */
139 };
140 
141 /*
142  * Returns 1 if event counts things relating to marked instructions
143  * and thus needs the MMCRA_SAMPLE_ENABLE bit set, or 0 if not.
144  */
p970_marked_instr_event(u64 event)145 static int p970_marked_instr_event(u64 event)
146 {
147 	int pmc, psel, unit, byte, bit;
148 	unsigned int mask;
149 
150 	pmc = (event >> PM_PMC_SH) & PM_PMC_MSK;
151 	psel = event & PM_PMCSEL_MSK;
152 	if (pmc) {
153 		if (direct_marked_event[pmc - 1] & (1 << psel))
154 			return 1;
155 		if (psel == 0)		/* add events */
156 			bit = (pmc <= 4)? pmc - 1: 8 - pmc;
157 		else if (psel == 7 || psel == 13)	/* decode events */
158 			bit = 4;
159 		else
160 			return 0;
161 	} else
162 		bit = psel;
163 
164 	byte = (event >> PM_BYTE_SH) & PM_BYTE_MSK;
165 	unit = (event >> PM_UNIT_SH) & PM_UNIT_MSK;
166 	mask = 0;
167 	switch (unit) {
168 	case PM_VPU:
169 		mask = 0x4c;		/* byte 0 bits 2,3,6 */
170 		break;
171 	case PM_LSU0:
172 		/* byte 2 bits 0,2,3,4,6; all of byte 1 */
173 		mask = 0x085dff00;
174 		break;
175 	case PM_LSU1L:
176 		mask = 0x50 << 24;	/* byte 3 bits 4,6 */
177 		break;
178 	}
179 	return (mask >> (byte * 8 + bit)) & 1;
180 }
181 
182 /* Masks and values for using events from the various units */
183 static unsigned long unit_cons[PM_LASTUNIT+1][2] = {
184 	[PM_FPU] =   { 0xc80000000000ull, 0x040000000000ull },
185 	[PM_VPU] =   { 0xc80000000000ull, 0xc40000000000ull },
186 	[PM_ISU] =   { 0x080000000000ull, 0x020000000000ull },
187 	[PM_IFU] =   { 0xc80000000000ull, 0x840000000000ull },
188 	[PM_IDU] =   { 0x380000000000ull, 0x010000000000ull },
189 	[PM_STS] =   { 0x380000000000ull, 0x310000000000ull },
190 };
191 
p970_get_constraint(u64 event,unsigned long * maskp,unsigned long * valp,u64 event_config1 __maybe_unused)192 static int p970_get_constraint(u64 event, unsigned long *maskp,
193 			       unsigned long *valp, u64 event_config1 __maybe_unused)
194 {
195 	int pmc, byte, unit, sh, spcsel;
196 	unsigned long mask = 0, value = 0;
197 	int grp = -1;
198 
199 	pmc = (event >> PM_PMC_SH) & PM_PMC_MSK;
200 	if (pmc) {
201 		if (pmc > 8)
202 			return -1;
203 		sh = (pmc - 1) * 2;
204 		mask |= 2 << sh;
205 		value |= 1 << sh;
206 		grp = ((pmc - 1) >> 1) & 1;
207 	}
208 	unit = (event >> PM_UNIT_SH) & PM_UNIT_MSK;
209 	if (unit) {
210 		if (unit > PM_LASTUNIT)
211 			return -1;
212 		mask |= unit_cons[unit][0];
213 		value |= unit_cons[unit][1];
214 		byte = (event >> PM_BYTE_SH) & PM_BYTE_MSK;
215 		/*
216 		 * Bus events on bytes 0 and 2 can be counted
217 		 * on PMC1/2/5/6; bytes 1 and 3 on PMC3/4/7/8.
218 		 */
219 		if (!pmc)
220 			grp = byte & 1;
221 		/* Set byte lane select field */
222 		mask  |= 0xfULL << (28 - 4 * byte);
223 		value |= (unsigned long)unit << (28 - 4 * byte);
224 	}
225 	if (grp == 0) {
226 		/* increment PMC1/2/5/6 field */
227 		mask  |= 0x8000000000ull;
228 		value |= 0x1000000000ull;
229 	} else if (grp == 1) {
230 		/* increment PMC3/4/7/8 field */
231 		mask  |= 0x800000000ull;
232 		value |= 0x100000000ull;
233 	}
234 	spcsel = (event >> PM_SPCSEL_SH) & PM_SPCSEL_MSK;
235 	if (spcsel) {
236 		mask  |= 3ull << 48;
237 		value |= (unsigned long)spcsel << 48;
238 	}
239 	*maskp = mask;
240 	*valp = value;
241 	return 0;
242 }
243 
p970_get_alternatives(u64 event,unsigned int flags,u64 alt[])244 static int p970_get_alternatives(u64 event, unsigned int flags, u64 alt[])
245 {
246 	alt[0] = event;
247 
248 	/* 2 alternatives for LSU empty */
249 	if (event == 0x2002 || event == 0x3002) {
250 		alt[1] = event ^ 0x1000;
251 		return 2;
252 	}
253 
254 	return 1;
255 }
256 
p970_compute_mmcr(u64 event[],int n_ev,unsigned int hwc[],struct mmcr_regs * mmcr,struct perf_event * pevents[],u32 flags __maybe_unused)257 static int p970_compute_mmcr(u64 event[], int n_ev,
258 			     unsigned int hwc[], struct mmcr_regs *mmcr,
259 			     struct perf_event *pevents[],
260 			     u32 flags __maybe_unused)
261 {
262 	unsigned long mmcr0 = 0, mmcr1 = 0, mmcra = 0;
263 	unsigned int pmc, unit, byte, psel;
264 	unsigned int ttm, grp;
265 	unsigned int pmc_inuse = 0;
266 	unsigned int pmc_grp_use[2];
267 	unsigned char busbyte[4];
268 	unsigned char unituse[16];
269 	unsigned char unitmap[] = { 0, 0<<3, 3<<3, 1<<3, 2<<3, 0|4, 3|4 };
270 	unsigned char ttmuse[2];
271 	unsigned char pmcsel[8];
272 	int i;
273 	int spcsel;
274 
275 	if (n_ev > 8)
276 		return -1;
277 
278 	/* First pass to count resource use */
279 	pmc_grp_use[0] = pmc_grp_use[1] = 0;
280 	memset(busbyte, 0, sizeof(busbyte));
281 	memset(unituse, 0, sizeof(unituse));
282 	for (i = 0; i < n_ev; ++i) {
283 		pmc = (event[i] >> PM_PMC_SH) & PM_PMC_MSK;
284 		if (pmc) {
285 			if (pmc_inuse & (1 << (pmc - 1)))
286 				return -1;
287 			pmc_inuse |= 1 << (pmc - 1);
288 			/* count 1/2/5/6 vs 3/4/7/8 use */
289 			++pmc_grp_use[((pmc - 1) >> 1) & 1];
290 		}
291 		unit = (event[i] >> PM_UNIT_SH) & PM_UNIT_MSK;
292 		byte = (event[i] >> PM_BYTE_SH) & PM_BYTE_MSK;
293 		if (unit) {
294 			if (unit > PM_LASTUNIT)
295 				return -1;
296 			if (!pmc)
297 				++pmc_grp_use[byte & 1];
298 			if (busbyte[byte] && busbyte[byte] != unit)
299 				return -1;
300 			busbyte[byte] = unit;
301 			unituse[unit] = 1;
302 		}
303 	}
304 	if (pmc_grp_use[0] > 4 || pmc_grp_use[1] > 4)
305 		return -1;
306 
307 	/*
308 	 * Assign resources and set multiplexer selects.
309 	 *
310 	 * PM_ISU can go either on TTM0 or TTM1, but that's the only
311 	 * choice we have to deal with.
312 	 */
313 	if (unituse[PM_ISU] &
314 	    (unituse[PM_FPU] | unituse[PM_IFU] | unituse[PM_VPU]))
315 		unitmap[PM_ISU] = 2 | 4;	/* move ISU to TTM1 */
316 	/* Set TTM[01]SEL fields. */
317 	ttmuse[0] = ttmuse[1] = 0;
318 	for (i = PM_FPU; i <= PM_STS; ++i) {
319 		if (!unituse[i])
320 			continue;
321 		ttm = unitmap[i];
322 		++ttmuse[(ttm >> 2) & 1];
323 		mmcr1 |= (unsigned long)(ttm & ~4) << MMCR1_TTM1SEL_SH;
324 	}
325 	/* Check only one unit per TTMx */
326 	if (ttmuse[0] > 1 || ttmuse[1] > 1)
327 		return -1;
328 
329 	/* Set byte lane select fields and TTM3SEL. */
330 	for (byte = 0; byte < 4; ++byte) {
331 		unit = busbyte[byte];
332 		if (!unit)
333 			continue;
334 		if (unit <= PM_STS)
335 			ttm = (unitmap[unit] >> 2) & 1;
336 		else if (unit == PM_LSU0)
337 			ttm = 2;
338 		else {
339 			ttm = 3;
340 			if (unit == PM_LSU1L && byte >= 2)
341 				mmcr1 |= 1ull << (MMCR1_TTM3SEL_SH + 3 - byte);
342 		}
343 		mmcr1 |= (unsigned long)ttm
344 			<< (MMCR1_TD_CP_DBG0SEL_SH - 2 * byte);
345 	}
346 
347 	/* Second pass: assign PMCs, set PMCxSEL and PMCx_ADDER_SEL fields */
348 	memset(pmcsel, 0x8, sizeof(pmcsel));	/* 8 means don't count */
349 	for (i = 0; i < n_ev; ++i) {
350 		pmc = (event[i] >> PM_PMC_SH) & PM_PMC_MSK;
351 		unit = (event[i] >> PM_UNIT_SH) & PM_UNIT_MSK;
352 		byte = (event[i] >> PM_BYTE_SH) & PM_BYTE_MSK;
353 		psel = event[i] & PM_PMCSEL_MSK;
354 		if (!pmc) {
355 			/* Bus event or any-PMC direct event */
356 			if (unit)
357 				psel |= 0x10 | ((byte & 2) << 2);
358 			else
359 				psel |= 8;
360 			for (pmc = 0; pmc < 8; ++pmc) {
361 				if (pmc_inuse & (1 << pmc))
362 					continue;
363 				grp = (pmc >> 1) & 1;
364 				if (unit) {
365 					if (grp == (byte & 1))
366 						break;
367 				} else if (pmc_grp_use[grp] < 4) {
368 					++pmc_grp_use[grp];
369 					break;
370 				}
371 			}
372 			pmc_inuse |= 1 << pmc;
373 		} else {
374 			/* Direct event */
375 			--pmc;
376 			if (psel == 0 && (byte & 2))
377 				/* add events on higher-numbered bus */
378 				mmcr1 |= 1ull << mmcr1_adder_bits[pmc];
379 		}
380 		pmcsel[pmc] = psel;
381 		hwc[i] = pmc;
382 		spcsel = (event[i] >> PM_SPCSEL_SH) & PM_SPCSEL_MSK;
383 		mmcr1 |= spcsel;
384 		if (p970_marked_instr_event(event[i]))
385 			mmcra |= MMCRA_SAMPLE_ENABLE;
386 	}
387 	for (pmc = 0; pmc < 2; ++pmc)
388 		mmcr0 |= pmcsel[pmc] << (MMCR0_PMC1SEL_SH - 7 * pmc);
389 	for (; pmc < 8; ++pmc)
390 		mmcr1 |= (unsigned long)pmcsel[pmc]
391 			<< (MMCR1_PMC3SEL_SH - 5 * (pmc - 2));
392 	if (pmc_inuse & 1)
393 		mmcr0 |= MMCR0_PMC1CE;
394 	if (pmc_inuse & 0xfe)
395 		mmcr0 |= MMCR0_PMCjCE;
396 
397 	mmcra |= 0x2000;	/* mark only one IOP per PPC instruction */
398 
399 	/* Return MMCRx values */
400 	mmcr->mmcr0 = mmcr0;
401 	mmcr->mmcr1 = mmcr1;
402 	mmcr->mmcra = mmcra;
403 	return 0;
404 }
405 
p970_disable_pmc(unsigned int pmc,struct mmcr_regs * mmcr)406 static void p970_disable_pmc(unsigned int pmc, struct mmcr_regs *mmcr)
407 {
408 	int shift;
409 
410 	/*
411 	 * Setting the PMCxSEL field to 0x08 disables PMC x.
412 	 */
413 	if (pmc <= 1) {
414 		shift = MMCR0_PMC1SEL_SH - 7 * pmc;
415 		mmcr->mmcr0 = (mmcr->mmcr0 & ~(0x1fUL << shift)) | (0x08UL << shift);
416 	} else {
417 		shift = MMCR1_PMC3SEL_SH - 5 * (pmc - 2);
418 		mmcr->mmcr1 = (mmcr->mmcr1 & ~(0x1fUL << shift)) | (0x08UL << shift);
419 	}
420 }
421 
422 static int ppc970_generic_events[] = {
423 	[PERF_COUNT_HW_CPU_CYCLES]		= 7,
424 	[PERF_COUNT_HW_INSTRUCTIONS]		= 1,
425 	[PERF_COUNT_HW_CACHE_REFERENCES]	= 0x8810, /* PM_LD_REF_L1 */
426 	[PERF_COUNT_HW_CACHE_MISSES]		= 0x3810, /* PM_LD_MISS_L1 */
427 	[PERF_COUNT_HW_BRANCH_INSTRUCTIONS]	= 0x431,  /* PM_BR_ISSUED */
428 	[PERF_COUNT_HW_BRANCH_MISSES] 		= 0x327,  /* PM_GRP_BR_MPRED */
429 };
430 
431 #define C(x)	PERF_COUNT_HW_CACHE_##x
432 
433 /*
434  * Table of generalized cache-related events.
435  * 0 means not supported, -1 means nonsensical, other values
436  * are event codes.
437  */
438 static u64 ppc970_cache_events[C(MAX)][C(OP_MAX)][C(RESULT_MAX)] = {
439 	[C(L1D)] = {		/* 	RESULT_ACCESS	RESULT_MISS */
440 		[C(OP_READ)] = {	0x8810,		0x3810	},
441 		[C(OP_WRITE)] = {	0x7810,		0x813	},
442 		[C(OP_PREFETCH)] = {	0x731,		0	},
443 	},
444 	[C(L1I)] = {		/* 	RESULT_ACCESS	RESULT_MISS */
445 		[C(OP_READ)] = {	0,		0	},
446 		[C(OP_WRITE)] = {	-1,		-1	},
447 		[C(OP_PREFETCH)] = {	0,		0	},
448 	},
449 	[C(LL)] = {		/* 	RESULT_ACCESS	RESULT_MISS */
450 		[C(OP_READ)] = {	0,		0	},
451 		[C(OP_WRITE)] = {	0,		0	},
452 		[C(OP_PREFETCH)] = {	0x733,		0	},
453 	},
454 	[C(DTLB)] = {		/* 	RESULT_ACCESS	RESULT_MISS */
455 		[C(OP_READ)] = {	0,		0x704	},
456 		[C(OP_WRITE)] = {	-1,		-1	},
457 		[C(OP_PREFETCH)] = {	-1,		-1	},
458 	},
459 	[C(ITLB)] = {		/* 	RESULT_ACCESS	RESULT_MISS */
460 		[C(OP_READ)] = {	0,		0x700	},
461 		[C(OP_WRITE)] = {	-1,		-1	},
462 		[C(OP_PREFETCH)] = {	-1,		-1	},
463 	},
464 	[C(BPU)] = {		/* 	RESULT_ACCESS	RESULT_MISS */
465 		[C(OP_READ)] = {	0x431,		0x327	},
466 		[C(OP_WRITE)] = {	-1,		-1	},
467 		[C(OP_PREFETCH)] = {	-1,		-1	},
468 	},
469 	[C(NODE)] = {		/* 	RESULT_ACCESS	RESULT_MISS */
470 		[C(OP_READ)] = {	-1,		-1	},
471 		[C(OP_WRITE)] = {	-1,		-1	},
472 		[C(OP_PREFETCH)] = {	-1,		-1	},
473 	},
474 };
475 
476 static struct power_pmu ppc970_pmu = {
477 	.name			= "PPC970/FX/MP",
478 	.n_counter		= 8,
479 	.max_alternatives	= 2,
480 	.add_fields		= 0x001100005555ull,
481 	.test_adder		= 0x013300000000ull,
482 	.compute_mmcr		= p970_compute_mmcr,
483 	.get_constraint		= p970_get_constraint,
484 	.get_alternatives	= p970_get_alternatives,
485 	.disable_pmc		= p970_disable_pmc,
486 	.n_generic		= ARRAY_SIZE(ppc970_generic_events),
487 	.generic_events		= ppc970_generic_events,
488 	.cache_events		= &ppc970_cache_events,
489 	.flags			= PPMU_NO_SIPR | PPMU_NO_CONT_SAMPLING,
490 };
491 
init_ppc970_pmu(void)492 int __init init_ppc970_pmu(void)
493 {
494 	unsigned int pvr = mfspr(SPRN_PVR);
495 
496 	if (PVR_VER(pvr) != PVR_970 && PVR_VER(pvr) != PVR_970MP &&
497 	    PVR_VER(pvr) != PVR_970FX && PVR_VER(pvr) != PVR_970GX)
498 		return -ENODEV;
499 
500 	return register_power_pmu(&ppc970_pmu);
501 }
502