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