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 */
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
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
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
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
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
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
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