1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Performance counter support for POWER7 processors. 4 * 5 * Copyright 2009 Paul Mackerras, IBM Corporation. 6 */ 7 #include <linux/kernel.h> 8 #include <linux/perf_event.h> 9 #include <linux/string.h> 10 #include <asm/reg.h> 11 #include <asm/cputable.h> 12 13 #include "internal.h" 14 15 /* 16 * Bits in event code for POWER7 17 */ 18 #define PM_PMC_SH 16 /* PMC number (1-based) for direct events */ 19 #define PM_PMC_MSK 0xf 20 #define PM_PMC_MSKS (PM_PMC_MSK << PM_PMC_SH) 21 #define PM_UNIT_SH 12 /* TTMMUX number and setting - unit select */ 22 #define PM_UNIT_MSK 0xf 23 #define PM_COMBINE_SH 11 /* Combined event bit */ 24 #define PM_COMBINE_MSK 1 25 #define PM_COMBINE_MSKS 0x800 26 #define PM_L2SEL_SH 8 /* L2 event select */ 27 #define PM_L2SEL_MSK 7 28 #define PM_PMCSEL_MSK 0xff 29 30 /* 31 * Bits in MMCR1 for POWER7 32 */ 33 #define MMCR1_TTM0SEL_SH 60 34 #define MMCR1_TTM1SEL_SH 56 35 #define MMCR1_TTM2SEL_SH 52 36 #define MMCR1_TTM3SEL_SH 48 37 #define MMCR1_TTMSEL_MSK 0xf 38 #define MMCR1_L2SEL_SH 45 39 #define MMCR1_L2SEL_MSK 7 40 #define MMCR1_PMC1_COMBINE_SH 35 41 #define MMCR1_PMC2_COMBINE_SH 34 42 #define MMCR1_PMC3_COMBINE_SH 33 43 #define MMCR1_PMC4_COMBINE_SH 32 44 #define MMCR1_PMC1SEL_SH 24 45 #define MMCR1_PMC2SEL_SH 16 46 #define MMCR1_PMC3SEL_SH 8 47 #define MMCR1_PMC4SEL_SH 0 48 #define MMCR1_PMCSEL_SH(n) (MMCR1_PMC1SEL_SH - (n) * 8) 49 #define MMCR1_PMCSEL_MSK 0xff 50 51 /* 52 * Power7 event codes. 53 */ 54 #define EVENT(_name, _code) \ 55 _name = _code, 56 57 enum { 58 #include "power7-events-list.h" 59 }; 60 #undef EVENT 61 62 /* 63 * Layout of constraint bits: 64 * 6666555555555544444444443333333333222222222211111111110000000000 65 * 3210987654321098765432109876543210987654321098765432109876543210 66 * < >< ><><><><><><> 67 * L2 NC P6P5P4P3P2P1 68 * 69 * L2 - 16-18 - Required L2SEL value (select field) 70 * 71 * NC - number of counters 72 * 15: NC error 0x8000 73 * 12-14: number of events needing PMC1-4 0x7000 74 * 75 * P6 76 * 11: P6 error 0x800 77 * 10-11: Count of events needing PMC6 78 * 79 * P1..P5 80 * 0-9: Count of events needing PMC1..PMC5 81 */ 82 83 static int power7_get_constraint(u64 event, unsigned long *maskp, 84 unsigned long *valp, u64 event_config1 __maybe_unused) 85 { 86 int pmc, sh, unit; 87 unsigned long mask = 0, value = 0; 88 89 pmc = (event >> PM_PMC_SH) & PM_PMC_MSK; 90 if (pmc) { 91 if (pmc > 6) 92 return -1; 93 sh = (pmc - 1) * 2; 94 mask |= 2 << sh; 95 value |= 1 << sh; 96 if (pmc >= 5 && !(event == 0x500fa || event == 0x600f4)) 97 return -1; 98 } 99 if (pmc < 5) { 100 /* need a counter from PMC1-4 set */ 101 mask |= 0x8000; 102 value |= 0x1000; 103 } 104 105 unit = (event >> PM_UNIT_SH) & PM_UNIT_MSK; 106 if (unit == 6) { 107 /* L2SEL must be identical across events */ 108 int l2sel = (event >> PM_L2SEL_SH) & PM_L2SEL_MSK; 109 mask |= 0x7 << 16; 110 value |= l2sel << 16; 111 } 112 113 *maskp = mask; 114 *valp = value; 115 return 0; 116 } 117 118 #define MAX_ALT 2 /* at most 2 alternatives for any event */ 119 120 static const unsigned int event_alternatives[][MAX_ALT] = { 121 { 0x200f2, 0x300f2 }, /* PM_INST_DISP */ 122 { 0x200f4, 0x600f4 }, /* PM_RUN_CYC */ 123 { 0x400fa, 0x500fa }, /* PM_RUN_INST_CMPL */ 124 }; 125 126 /* 127 * Scan the alternatives table for a match and return the 128 * index into the alternatives table if found, else -1. 129 */ 130 static int find_alternative(u64 event) 131 { 132 int i, j; 133 134 for (i = 0; i < ARRAY_SIZE(event_alternatives); ++i) { 135 if (event < event_alternatives[i][0]) 136 break; 137 for (j = 0; j < MAX_ALT && event_alternatives[i][j]; ++j) 138 if (event == event_alternatives[i][j]) 139 return i; 140 } 141 return -1; 142 } 143 144 static s64 find_alternative_decode(u64 event) 145 { 146 int pmc, psel; 147 148 /* this only handles the 4x decode events */ 149 pmc = (event >> PM_PMC_SH) & PM_PMC_MSK; 150 psel = event & PM_PMCSEL_MSK; 151 if ((pmc == 2 || pmc == 4) && (psel & ~7) == 0x40) 152 return event - (1 << PM_PMC_SH) + 8; 153 if ((pmc == 1 || pmc == 3) && (psel & ~7) == 0x48) 154 return event + (1 << PM_PMC_SH) - 8; 155 return -1; 156 } 157 158 static int power7_get_alternatives(u64 event, unsigned int flags, u64 alt[]) 159 { 160 int i, j, nalt = 1; 161 s64 ae; 162 163 alt[0] = event; 164 nalt = 1; 165 i = find_alternative(event); 166 if (i >= 0) { 167 for (j = 0; j < MAX_ALT; ++j) { 168 ae = event_alternatives[i][j]; 169 if (ae && ae != event) 170 alt[nalt++] = ae; 171 } 172 } else { 173 ae = find_alternative_decode(event); 174 if (ae > 0) 175 alt[nalt++] = ae; 176 } 177 178 if (flags & PPMU_ONLY_COUNT_RUN) { 179 /* 180 * We're only counting in RUN state, 181 * so PM_CYC is equivalent to PM_RUN_CYC 182 * and PM_INST_CMPL === PM_RUN_INST_CMPL. 183 * This doesn't include alternatives that don't provide 184 * any extra flexibility in assigning PMCs. 185 */ 186 j = nalt; 187 for (i = 0; i < nalt; ++i) { 188 switch (alt[i]) { 189 case 0x1e: /* PM_CYC */ 190 alt[j++] = 0x600f4; /* PM_RUN_CYC */ 191 break; 192 case 0x600f4: /* PM_RUN_CYC */ 193 alt[j++] = 0x1e; 194 break; 195 case 0x2: /* PM_PPC_CMPL */ 196 alt[j++] = 0x500fa; /* PM_RUN_INST_CMPL */ 197 break; 198 case 0x500fa: /* PM_RUN_INST_CMPL */ 199 alt[j++] = 0x2; /* PM_PPC_CMPL */ 200 break; 201 } 202 } 203 nalt = j; 204 } 205 206 return nalt; 207 } 208 209 /* 210 * Returns 1 if event counts things relating to marked instructions 211 * and thus needs the MMCRA_SAMPLE_ENABLE bit set, or 0 if not. 212 */ 213 static int power7_marked_instr_event(u64 event) 214 { 215 int pmc, psel; 216 int unit; 217 218 pmc = (event >> PM_PMC_SH) & PM_PMC_MSK; 219 unit = (event >> PM_UNIT_SH) & PM_UNIT_MSK; 220 psel = event & PM_PMCSEL_MSK & ~1; /* trim off edge/level bit */ 221 if (pmc >= 5) 222 return 0; 223 224 switch (psel >> 4) { 225 case 2: 226 return pmc == 2 || pmc == 4; 227 case 3: 228 if (psel == 0x3c) 229 return pmc == 1; 230 if (psel == 0x3e) 231 return pmc != 2; 232 return 1; 233 case 4: 234 case 5: 235 return unit == 0xd; 236 case 6: 237 if (psel == 0x64) 238 return pmc >= 3; 239 break; 240 case 8: 241 return unit == 0xd; 242 } 243 return 0; 244 } 245 246 static int power7_compute_mmcr(u64 event[], int n_ev, 247 unsigned int hwc[], struct mmcr_regs *mmcr, 248 struct perf_event *pevents[], 249 u32 flags __maybe_unused) 250 { 251 unsigned long mmcr1 = 0; 252 unsigned long mmcra = MMCRA_SDAR_DCACHE_MISS | MMCRA_SDAR_ERAT_MISS; 253 unsigned int pmc, unit, combine, l2sel, psel; 254 unsigned int pmc_inuse = 0; 255 int i; 256 257 /* First pass to count resource use */ 258 for (i = 0; i < n_ev; ++i) { 259 pmc = (event[i] >> PM_PMC_SH) & PM_PMC_MSK; 260 if (pmc) { 261 if (pmc > 6) 262 return -1; 263 if (pmc_inuse & (1 << (pmc - 1))) 264 return -1; 265 pmc_inuse |= 1 << (pmc - 1); 266 } 267 } 268 269 /* Second pass: assign PMCs, set all MMCR1 fields */ 270 for (i = 0; i < n_ev; ++i) { 271 pmc = (event[i] >> PM_PMC_SH) & PM_PMC_MSK; 272 unit = (event[i] >> PM_UNIT_SH) & PM_UNIT_MSK; 273 combine = (event[i] >> PM_COMBINE_SH) & PM_COMBINE_MSK; 274 l2sel = (event[i] >> PM_L2SEL_SH) & PM_L2SEL_MSK; 275 psel = event[i] & PM_PMCSEL_MSK; 276 if (!pmc) { 277 /* Bus event or any-PMC direct event */ 278 for (pmc = 0; pmc < 4; ++pmc) { 279 if (!(pmc_inuse & (1 << pmc))) 280 break; 281 } 282 if (pmc >= 4) 283 return -1; 284 pmc_inuse |= 1 << pmc; 285 } else { 286 /* Direct or decoded event */ 287 --pmc; 288 } 289 if (pmc <= 3) { 290 mmcr1 |= (unsigned long) unit 291 << (MMCR1_TTM0SEL_SH - 4 * pmc); 292 mmcr1 |= (unsigned long) combine 293 << (MMCR1_PMC1_COMBINE_SH - pmc); 294 mmcr1 |= psel << MMCR1_PMCSEL_SH(pmc); 295 if (unit == 6) /* L2 events */ 296 mmcr1 |= (unsigned long) l2sel 297 << MMCR1_L2SEL_SH; 298 } 299 if (power7_marked_instr_event(event[i])) 300 mmcra |= MMCRA_SAMPLE_ENABLE; 301 hwc[i] = pmc; 302 } 303 304 /* Return MMCRx values */ 305 mmcr->mmcr0 = 0; 306 if (pmc_inuse & 1) 307 mmcr->mmcr0 = MMCR0_PMC1CE; 308 if (pmc_inuse & 0x3e) 309 mmcr->mmcr0 |= MMCR0_PMCjCE; 310 mmcr->mmcr1 = mmcr1; 311 mmcr->mmcra = mmcra; 312 return 0; 313 } 314 315 static void power7_disable_pmc(unsigned int pmc, struct mmcr_regs *mmcr) 316 { 317 if (pmc <= 3) 318 mmcr->mmcr1 &= ~(0xffUL << MMCR1_PMCSEL_SH(pmc)); 319 } 320 321 static int power7_generic_events[] = { 322 [PERF_COUNT_HW_CPU_CYCLES] = PM_CYC, 323 [PERF_COUNT_HW_STALLED_CYCLES_FRONTEND] = PM_GCT_NOSLOT_CYC, 324 [PERF_COUNT_HW_STALLED_CYCLES_BACKEND] = PM_CMPLU_STALL, 325 [PERF_COUNT_HW_INSTRUCTIONS] = PM_INST_CMPL, 326 [PERF_COUNT_HW_CACHE_REFERENCES] = PM_LD_REF_L1, 327 [PERF_COUNT_HW_CACHE_MISSES] = PM_LD_MISS_L1, 328 [PERF_COUNT_HW_BRANCH_INSTRUCTIONS] = PM_BRU_FIN, 329 [PERF_COUNT_HW_BRANCH_MISSES] = PM_BR_MPRED, 330 }; 331 332 #define C(x) PERF_COUNT_HW_CACHE_##x 333 334 /* 335 * Table of generalized cache-related events. 336 * 0 means not supported, -1 means nonsensical, other values 337 * are event codes. 338 */ 339 static u64 power7_cache_events[C(MAX)][C(OP_MAX)][C(RESULT_MAX)] = { 340 [C(L1D)] = { /* RESULT_ACCESS RESULT_MISS */ 341 [C(OP_READ)] = { 0xc880, 0x400f0 }, 342 [C(OP_WRITE)] = { 0, 0x300f0 }, 343 [C(OP_PREFETCH)] = { 0xd8b8, 0 }, 344 }, 345 [C(L1I)] = { /* RESULT_ACCESS RESULT_MISS */ 346 [C(OP_READ)] = { 0, 0x200fc }, 347 [C(OP_WRITE)] = { -1, -1 }, 348 [C(OP_PREFETCH)] = { 0x408a, 0 }, 349 }, 350 [C(LL)] = { /* RESULT_ACCESS RESULT_MISS */ 351 [C(OP_READ)] = { 0x16080, 0x26080 }, 352 [C(OP_WRITE)] = { 0x16082, 0x26082 }, 353 [C(OP_PREFETCH)] = { 0, 0 }, 354 }, 355 [C(DTLB)] = { /* RESULT_ACCESS RESULT_MISS */ 356 [C(OP_READ)] = { 0, 0x300fc }, 357 [C(OP_WRITE)] = { -1, -1 }, 358 [C(OP_PREFETCH)] = { -1, -1 }, 359 }, 360 [C(ITLB)] = { /* RESULT_ACCESS RESULT_MISS */ 361 [C(OP_READ)] = { 0, 0x400fc }, 362 [C(OP_WRITE)] = { -1, -1 }, 363 [C(OP_PREFETCH)] = { -1, -1 }, 364 }, 365 [C(BPU)] = { /* RESULT_ACCESS RESULT_MISS */ 366 [C(OP_READ)] = { 0x10068, 0x400f6 }, 367 [C(OP_WRITE)] = { -1, -1 }, 368 [C(OP_PREFETCH)] = { -1, -1 }, 369 }, 370 [C(NODE)] = { /* RESULT_ACCESS RESULT_MISS */ 371 [C(OP_READ)] = { -1, -1 }, 372 [C(OP_WRITE)] = { -1, -1 }, 373 [C(OP_PREFETCH)] = { -1, -1 }, 374 }, 375 }; 376 377 378 GENERIC_EVENT_ATTR(cpu-cycles, PM_CYC); 379 GENERIC_EVENT_ATTR(stalled-cycles-frontend, PM_GCT_NOSLOT_CYC); 380 GENERIC_EVENT_ATTR(stalled-cycles-backend, PM_CMPLU_STALL); 381 GENERIC_EVENT_ATTR(instructions, PM_INST_CMPL); 382 GENERIC_EVENT_ATTR(cache-references, PM_LD_REF_L1); 383 GENERIC_EVENT_ATTR(cache-misses, PM_LD_MISS_L1); 384 GENERIC_EVENT_ATTR(branch-instructions, PM_BRU_FIN); 385 GENERIC_EVENT_ATTR(branch-misses, PM_BR_MPRED); 386 387 #define EVENT(_name, _code) POWER_EVENT_ATTR(_name, _name); 388 #include "power7-events-list.h" 389 #undef EVENT 390 391 #define EVENT(_name, _code) POWER_EVENT_PTR(_name), 392 393 static struct attribute *power7_events_attr[] = { 394 GENERIC_EVENT_PTR(PM_CYC), 395 GENERIC_EVENT_PTR(PM_GCT_NOSLOT_CYC), 396 GENERIC_EVENT_PTR(PM_CMPLU_STALL), 397 GENERIC_EVENT_PTR(PM_INST_CMPL), 398 GENERIC_EVENT_PTR(PM_LD_REF_L1), 399 GENERIC_EVENT_PTR(PM_LD_MISS_L1), 400 GENERIC_EVENT_PTR(PM_BRU_FIN), 401 GENERIC_EVENT_PTR(PM_BR_MPRED), 402 403 #include "power7-events-list.h" 404 #undef EVENT 405 NULL 406 }; 407 408 static const struct attribute_group power7_pmu_events_group = { 409 .name = "events", 410 .attrs = power7_events_attr, 411 }; 412 413 PMU_FORMAT_ATTR(event, "config:0-19"); 414 415 static struct attribute *power7_pmu_format_attr[] = { 416 &format_attr_event.attr, 417 NULL, 418 }; 419 420 static const struct attribute_group power7_pmu_format_group = { 421 .name = "format", 422 .attrs = power7_pmu_format_attr, 423 }; 424 425 static const struct attribute_group *power7_pmu_attr_groups[] = { 426 &power7_pmu_format_group, 427 &power7_pmu_events_group, 428 NULL, 429 }; 430 431 static struct power_pmu power7_pmu = { 432 .name = "POWER7", 433 .n_counter = 6, 434 .max_alternatives = MAX_ALT + 1, 435 .add_fields = 0x1555ul, 436 .test_adder = 0x3000ul, 437 .compute_mmcr = power7_compute_mmcr, 438 .get_constraint = power7_get_constraint, 439 .get_alternatives = power7_get_alternatives, 440 .disable_pmc = power7_disable_pmc, 441 .flags = PPMU_ALT_SIPR, 442 .attr_groups = power7_pmu_attr_groups, 443 .n_generic = ARRAY_SIZE(power7_generic_events), 444 .generic_events = power7_generic_events, 445 .cache_events = &power7_cache_events, 446 }; 447 448 int __init init_power7_pmu(void) 449 { 450 unsigned int pvr = mfspr(SPRN_PVR); 451 452 if (PVR_VER(pvr) != PVR_POWER7 && PVR_VER(pvr) != PVR_POWER7p) 453 return -ENODEV; 454 455 if (PVR_VER(pvr) == PVR_POWER7p) 456 power7_pmu.flags |= PPMU_SIAR_VALID; 457 458 return register_power_pmu(&power7_pmu); 459 } 460