1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Performance counter support for MPC7450-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 #define N_COUNTER 6 /* Number of hardware counters */ 13 #define MAX_ALT 3 /* Maximum number of event alternative codes */ 14 15 /* 16 * Bits in event code for MPC7450 family 17 */ 18 #define PM_THRMULT_MSKS 0x40000 19 #define PM_THRESH_SH 12 20 #define PM_THRESH_MSK 0x3f 21 #define PM_PMC_SH 8 22 #define PM_PMC_MSK 7 23 #define PM_PMCSEL_MSK 0x7f 24 25 /* 26 * Classify events according to how specific their PMC requirements are. 27 * Result is: 28 * 0: can go on any PMC 29 * 1: can go on PMCs 1-4 30 * 2: can go on PMCs 1,2,4 31 * 3: can go on PMCs 1 or 2 32 * 4: can only go on one PMC 33 * -1: event code is invalid 34 */ 35 #define N_CLASSES 5 36 37 static int mpc7450_classify_event(u32 event) 38 { 39 int pmc; 40 41 pmc = (event >> PM_PMC_SH) & PM_PMC_MSK; 42 if (pmc) { 43 if (pmc > N_COUNTER) 44 return -1; 45 return 4; 46 } 47 event &= PM_PMCSEL_MSK; 48 if (event <= 1) 49 return 0; 50 if (event <= 7) 51 return 1; 52 if (event <= 13) 53 return 2; 54 if (event <= 22) 55 return 3; 56 return -1; 57 } 58 59 /* 60 * Events using threshold and possible threshold scale: 61 * code scale? name 62 * 11e N PM_INSTQ_EXCEED_CYC 63 * 11f N PM_ALTV_IQ_EXCEED_CYC 64 * 128 Y PM_DTLB_SEARCH_EXCEED_CYC 65 * 12b Y PM_LD_MISS_EXCEED_L1_CYC 66 * 220 N PM_CQ_EXCEED_CYC 67 * 30c N PM_GPR_RB_EXCEED_CYC 68 * 30d ? PM_FPR_IQ_EXCEED_CYC ? 69 * 311 Y PM_ITLB_SEARCH_EXCEED 70 * 410 N PM_GPR_IQ_EXCEED_CYC 71 */ 72 73 /* 74 * Return use of threshold and threshold scale bits: 75 * 0 = uses neither, 1 = uses threshold, 2 = uses both 76 */ 77 static int mpc7450_threshold_use(u32 event) 78 { 79 int pmc, sel; 80 81 pmc = (event >> PM_PMC_SH) & PM_PMC_MSK; 82 sel = event & PM_PMCSEL_MSK; 83 switch (pmc) { 84 case 1: 85 if (sel == 0x1e || sel == 0x1f) 86 return 1; 87 if (sel == 0x28 || sel == 0x2b) 88 return 2; 89 break; 90 case 2: 91 if (sel == 0x20) 92 return 1; 93 break; 94 case 3: 95 if (sel == 0xc || sel == 0xd) 96 return 1; 97 if (sel == 0x11) 98 return 2; 99 break; 100 case 4: 101 if (sel == 0x10) 102 return 1; 103 break; 104 } 105 return 0; 106 } 107 108 /* 109 * Layout of constraint bits: 110 * 33222222222211111111110000000000 111 * 10987654321098765432109876543210 112 * |< >< > < > < ><><><><><><> 113 * TS TV G4 G3 G2P6P5P4P3P2P1 114 * 115 * P1 - P6 116 * 0 - 11: Count of events needing PMC1 .. PMC6 117 * 118 * G2 119 * 12 - 14: Count of events needing PMC1 or PMC2 120 * 121 * G3 122 * 16 - 18: Count of events needing PMC1, PMC2 or PMC4 123 * 124 * G4 125 * 20 - 23: Count of events needing PMC1, PMC2, PMC3 or PMC4 126 * 127 * TV 128 * 24 - 29: Threshold value requested 129 * 130 * TS 131 * 30: Threshold scale value requested 132 */ 133 134 static u32 pmcbits[N_COUNTER][2] = { 135 { 0x00844002, 0x00111001 }, /* PMC1 mask, value: P1,G2,G3,G4 */ 136 { 0x00844008, 0x00111004 }, /* PMC2: P2,G2,G3,G4 */ 137 { 0x00800020, 0x00100010 }, /* PMC3: P3,G4 */ 138 { 0x00840080, 0x00110040 }, /* PMC4: P4,G3,G4 */ 139 { 0x00000200, 0x00000100 }, /* PMC5: P5 */ 140 { 0x00000800, 0x00000400 } /* PMC6: P6 */ 141 }; 142 143 static u32 classbits[N_CLASSES - 1][2] = { 144 { 0x00000000, 0x00000000 }, /* class 0: no constraint */ 145 { 0x00800000, 0x00100000 }, /* class 1: G4 */ 146 { 0x00040000, 0x00010000 }, /* class 2: G3 */ 147 { 0x00004000, 0x00001000 }, /* class 3: G2 */ 148 }; 149 150 static int mpc7450_get_constraint(u64 event, unsigned long *maskp, 151 unsigned long *valp, u64 event_config1 __maybe_unused) 152 { 153 int pmc, class; 154 u32 mask, value; 155 int thresh, tuse; 156 157 class = mpc7450_classify_event(event); 158 if (class < 0) 159 return -1; 160 if (class == 4) { 161 pmc = ((unsigned int)event >> PM_PMC_SH) & PM_PMC_MSK; 162 mask = pmcbits[pmc - 1][0]; 163 value = pmcbits[pmc - 1][1]; 164 } else { 165 mask = classbits[class][0]; 166 value = classbits[class][1]; 167 } 168 169 tuse = mpc7450_threshold_use(event); 170 if (tuse) { 171 thresh = ((unsigned int)event >> PM_THRESH_SH) & PM_THRESH_MSK; 172 mask |= 0x3f << 24; 173 value |= thresh << 24; 174 if (tuse == 2) { 175 mask |= 0x40000000; 176 if ((unsigned int)event & PM_THRMULT_MSKS) 177 value |= 0x40000000; 178 } 179 } 180 181 *maskp = mask; 182 *valp = value; 183 return 0; 184 } 185 186 static const unsigned int event_alternatives[][MAX_ALT] = { 187 { 0x217, 0x317 }, /* PM_L1_DCACHE_MISS */ 188 { 0x418, 0x50f, 0x60f }, /* PM_SNOOP_RETRY */ 189 { 0x502, 0x602 }, /* PM_L2_HIT */ 190 { 0x503, 0x603 }, /* PM_L3_HIT */ 191 { 0x504, 0x604 }, /* PM_L2_ICACHE_MISS */ 192 { 0x505, 0x605 }, /* PM_L3_ICACHE_MISS */ 193 { 0x506, 0x606 }, /* PM_L2_DCACHE_MISS */ 194 { 0x507, 0x607 }, /* PM_L3_DCACHE_MISS */ 195 { 0x50a, 0x623 }, /* PM_LD_HIT_L3 */ 196 { 0x50b, 0x624 }, /* PM_ST_HIT_L3 */ 197 { 0x50d, 0x60d }, /* PM_L2_TOUCH_HIT */ 198 { 0x50e, 0x60e }, /* PM_L3_TOUCH_HIT */ 199 { 0x512, 0x612 }, /* PM_INT_LOCAL */ 200 { 0x513, 0x61d }, /* PM_L2_MISS */ 201 { 0x514, 0x61e }, /* PM_L3_MISS */ 202 }; 203 204 /* 205 * Scan the alternatives table for a match and return the 206 * index into the alternatives table if found, else -1. 207 */ 208 static int find_alternative(u32 event) 209 { 210 int i, j; 211 212 for (i = 0; i < ARRAY_SIZE(event_alternatives); ++i) { 213 if (event < event_alternatives[i][0]) 214 break; 215 for (j = 0; j < MAX_ALT && event_alternatives[i][j]; ++j) 216 if (event == event_alternatives[i][j]) 217 return i; 218 } 219 return -1; 220 } 221 222 static int mpc7450_get_alternatives(u64 event, unsigned int flags, u64 alt[]) 223 { 224 int i, j, nalt = 1; 225 u32 ae; 226 227 alt[0] = event; 228 nalt = 1; 229 i = find_alternative((u32)event); 230 if (i >= 0) { 231 for (j = 0; j < MAX_ALT; ++j) { 232 ae = event_alternatives[i][j]; 233 if (ae && ae != (u32)event) 234 alt[nalt++] = ae; 235 } 236 } 237 return nalt; 238 } 239 240 /* 241 * Bitmaps of which PMCs each class can use for classes 0 - 3. 242 * Bit i is set if PMC i+1 is usable. 243 */ 244 static const u8 classmap[N_CLASSES] = { 245 0x3f, 0x0f, 0x0b, 0x03, 0 246 }; 247 248 /* Bit position and width of each PMCSEL field */ 249 static const int pmcsel_shift[N_COUNTER] = { 250 6, 0, 27, 22, 17, 11 251 }; 252 static const u32 pmcsel_mask[N_COUNTER] = { 253 0x7f, 0x3f, 0x1f, 0x1f, 0x1f, 0x3f 254 }; 255 256 /* 257 * Compute MMCR0/1/2 values for a set of events. 258 */ 259 static int mpc7450_compute_mmcr(u64 event[], int n_ev, unsigned int hwc[], 260 struct mmcr_regs *mmcr, 261 struct perf_event *pevents[], 262 u32 flags __maybe_unused) 263 { 264 u8 event_index[N_CLASSES][N_COUNTER]; 265 int n_classevent[N_CLASSES]; 266 int i, j, class, tuse; 267 u32 pmc_inuse = 0, pmc_avail; 268 u32 mmcr0 = 0, mmcr1 = 0, mmcr2 = 0; 269 u32 ev, pmc, thresh; 270 271 if (n_ev > N_COUNTER) 272 return -1; 273 274 /* First pass: count usage in each class */ 275 for (i = 0; i < N_CLASSES; ++i) 276 n_classevent[i] = 0; 277 for (i = 0; i < n_ev; ++i) { 278 class = mpc7450_classify_event(event[i]); 279 if (class < 0) 280 return -1; 281 j = n_classevent[class]++; 282 event_index[class][j] = i; 283 } 284 285 /* Second pass: allocate PMCs from most specific event to least */ 286 for (class = N_CLASSES - 1; class >= 0; --class) { 287 for (i = 0; i < n_classevent[class]; ++i) { 288 ev = event[event_index[class][i]]; 289 if (class == 4) { 290 pmc = (ev >> PM_PMC_SH) & PM_PMC_MSK; 291 if (pmc_inuse & (1 << (pmc - 1))) 292 return -1; 293 } else { 294 /* Find a suitable PMC */ 295 pmc_avail = classmap[class] & ~pmc_inuse; 296 if (!pmc_avail) 297 return -1; 298 pmc = ffs(pmc_avail); 299 } 300 pmc_inuse |= 1 << (pmc - 1); 301 302 tuse = mpc7450_threshold_use(ev); 303 if (tuse) { 304 thresh = (ev >> PM_THRESH_SH) & PM_THRESH_MSK; 305 mmcr0 |= thresh << 16; 306 if (tuse == 2 && (ev & PM_THRMULT_MSKS)) 307 mmcr2 = 0x80000000; 308 } 309 ev &= pmcsel_mask[pmc - 1]; 310 ev <<= pmcsel_shift[pmc - 1]; 311 if (pmc <= 2) 312 mmcr0 |= ev; 313 else 314 mmcr1 |= ev; 315 hwc[event_index[class][i]] = pmc - 1; 316 } 317 } 318 319 if (pmc_inuse & 1) 320 mmcr0 |= MMCR0_PMC1CE; 321 if (pmc_inuse & 0x3e) 322 mmcr0 |= MMCR0_PMCnCE; 323 324 /* Return MMCRx values */ 325 mmcr->mmcr0 = mmcr0; 326 mmcr->mmcr1 = mmcr1; 327 mmcr->mmcr2 = mmcr2; 328 /* 329 * 32-bit doesn't have an MMCRA and uses SPRN_MMCR2 to define 330 * SPRN_MMCRA. So assign mmcra of cpu_hw_events with `mmcr2` 331 * value to ensure that any write to this SPRN_MMCRA will 332 * use mmcr2 value. 333 */ 334 mmcr->mmcra = mmcr2; 335 return 0; 336 } 337 338 /* 339 * Disable counting by a PMC. 340 * Note that the pmc argument is 0-based here, not 1-based. 341 */ 342 static void mpc7450_disable_pmc(unsigned int pmc, struct mmcr_regs *mmcr) 343 { 344 if (pmc <= 1) 345 mmcr->mmcr0 &= ~(pmcsel_mask[pmc] << pmcsel_shift[pmc]); 346 else 347 mmcr->mmcr1 &= ~(pmcsel_mask[pmc] << pmcsel_shift[pmc]); 348 } 349 350 static int mpc7450_generic_events[] = { 351 [PERF_COUNT_HW_CPU_CYCLES] = 1, 352 [PERF_COUNT_HW_INSTRUCTIONS] = 2, 353 [PERF_COUNT_HW_CACHE_MISSES] = 0x217, /* PM_L1_DCACHE_MISS */ 354 [PERF_COUNT_HW_BRANCH_INSTRUCTIONS] = 0x122, /* PM_BR_CMPL */ 355 [PERF_COUNT_HW_BRANCH_MISSES] = 0x41c, /* PM_BR_MPRED */ 356 }; 357 358 #define C(x) PERF_COUNT_HW_CACHE_##x 359 360 /* 361 * Table of generalized cache-related events. 362 * 0 means not supported, -1 means nonsensical, other values 363 * are event codes. 364 */ 365 static u64 mpc7450_cache_events[C(MAX)][C(OP_MAX)][C(RESULT_MAX)] = { 366 [C(L1D)] = { /* RESULT_ACCESS RESULT_MISS */ 367 [C(OP_READ)] = { 0, 0x225 }, 368 [C(OP_WRITE)] = { 0, 0x227 }, 369 [C(OP_PREFETCH)] = { 0, 0 }, 370 }, 371 [C(L1I)] = { /* RESULT_ACCESS RESULT_MISS */ 372 [C(OP_READ)] = { 0x129, 0x115 }, 373 [C(OP_WRITE)] = { -1, -1 }, 374 [C(OP_PREFETCH)] = { 0x634, 0 }, 375 }, 376 [C(LL)] = { /* RESULT_ACCESS RESULT_MISS */ 377 [C(OP_READ)] = { 0, 0 }, 378 [C(OP_WRITE)] = { 0, 0 }, 379 [C(OP_PREFETCH)] = { 0, 0 }, 380 }, 381 [C(DTLB)] = { /* RESULT_ACCESS RESULT_MISS */ 382 [C(OP_READ)] = { 0, 0x312 }, 383 [C(OP_WRITE)] = { -1, -1 }, 384 [C(OP_PREFETCH)] = { -1, -1 }, 385 }, 386 [C(ITLB)] = { /* RESULT_ACCESS RESULT_MISS */ 387 [C(OP_READ)] = { 0, 0x223 }, 388 [C(OP_WRITE)] = { -1, -1 }, 389 [C(OP_PREFETCH)] = { -1, -1 }, 390 }, 391 [C(BPU)] = { /* RESULT_ACCESS RESULT_MISS */ 392 [C(OP_READ)] = { 0x122, 0x41c }, 393 [C(OP_WRITE)] = { -1, -1 }, 394 [C(OP_PREFETCH)] = { -1, -1 }, 395 }, 396 [C(NODE)] = { /* RESULT_ACCESS RESULT_MISS */ 397 [C(OP_READ)] = { -1, -1 }, 398 [C(OP_WRITE)] = { -1, -1 }, 399 [C(OP_PREFETCH)] = { -1, -1 }, 400 }, 401 }; 402 403 struct power_pmu mpc7450_pmu = { 404 .name = "MPC7450 family", 405 .n_counter = N_COUNTER, 406 .max_alternatives = MAX_ALT, 407 .add_fields = 0x00111555ul, 408 .test_adder = 0x00301000ul, 409 .compute_mmcr = mpc7450_compute_mmcr, 410 .get_constraint = mpc7450_get_constraint, 411 .get_alternatives = mpc7450_get_alternatives, 412 .disable_pmc = mpc7450_disable_pmc, 413 .n_generic = ARRAY_SIZE(mpc7450_generic_events), 414 .generic_events = mpc7450_generic_events, 415 .cache_events = &mpc7450_cache_events, 416 }; 417 418 static int __init init_mpc7450_pmu(void) 419 { 420 unsigned int pvr = mfspr(SPRN_PVR); 421 422 if (PVR_VER(pvr) != PVR_7450) 423 return -ENODEV; 424 425 return register_power_pmu(&mpc7450_pmu); 426 } 427 428 early_initcall(init_mpc7450_pmu); 429