1 /*- 2 * Copyright (c) 2015 Ruslan Bukin <br@bsdpad.com> 3 * All rights reserved. 4 * 5 * This software was developed by the University of Cambridge Computer 6 * Laboratory with support from ARM Ltd. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30 #include <sys/cdefs.h> 31 __FBSDID("$FreeBSD$"); 32 33 #include <sys/param.h> 34 #include <sys/systm.h> 35 #include <sys/pmc.h> 36 #include <sys/pmckern.h> 37 38 #include <machine/pmc_mdep.h> 39 #include <machine/cpu.h> 40 41 static int arm64_npmcs; 42 43 struct arm64_event_code_map { 44 enum pmc_event pe_ev; 45 uint8_t pe_code; 46 }; 47 48 /* 49 * Per-processor information. 50 */ 51 struct arm64_cpu { 52 struct pmc_hw *pc_arm64pmcs; 53 }; 54 55 static struct arm64_cpu **arm64_pcpu; 56 57 /* 58 * Interrupt Enable Set Register 59 */ 60 static __inline void 61 arm64_interrupt_enable(uint32_t pmc) 62 { 63 uint32_t reg; 64 65 reg = (1 << pmc); 66 WRITE_SPECIALREG(PMINTENSET_EL1, reg); 67 68 isb(); 69 } 70 71 /* 72 * Interrupt Clear Set Register 73 */ 74 static __inline void 75 arm64_interrupt_disable(uint32_t pmc) 76 { 77 uint32_t reg; 78 79 reg = (1 << pmc); 80 WRITE_SPECIALREG(PMINTENCLR_EL1, reg); 81 82 isb(); 83 } 84 85 /* 86 * Counter Set Enable Register 87 */ 88 static __inline void 89 arm64_counter_enable(unsigned int pmc) 90 { 91 uint32_t reg; 92 93 reg = (1 << pmc); 94 WRITE_SPECIALREG(PMCNTENSET_EL0, reg); 95 96 isb(); 97 } 98 99 /* 100 * Counter Clear Enable Register 101 */ 102 static __inline void 103 arm64_counter_disable(unsigned int pmc) 104 { 105 uint32_t reg; 106 107 reg = (1 << pmc); 108 WRITE_SPECIALREG(PMCNTENCLR_EL0, reg); 109 110 isb(); 111 } 112 113 /* 114 * Performance Monitors Control Register 115 */ 116 static uint32_t 117 arm64_pmcr_read(void) 118 { 119 uint32_t reg; 120 121 reg = READ_SPECIALREG(PMCR_EL0); 122 123 return (reg); 124 } 125 126 static void 127 arm64_pmcr_write(uint32_t reg) 128 { 129 130 WRITE_SPECIALREG(PMCR_EL0, reg); 131 132 isb(); 133 } 134 135 /* 136 * Performance Count Register N 137 */ 138 static uint32_t 139 arm64_pmcn_read(unsigned int pmc) 140 { 141 142 KASSERT(pmc < arm64_npmcs, ("%s: illegal PMC number %d", __func__, pmc)); 143 144 WRITE_SPECIALREG(PMSELR_EL0, pmc); 145 146 isb(); 147 148 return (READ_SPECIALREG(PMXEVCNTR_EL0)); 149 } 150 151 static void 152 arm64_pmcn_write(unsigned int pmc, uint32_t reg) 153 { 154 155 KASSERT(pmc < arm64_npmcs, ("%s: illegal PMC number %d", __func__, pmc)); 156 157 WRITE_SPECIALREG(PMSELR_EL0, pmc); 158 WRITE_SPECIALREG(PMXEVCNTR_EL0, reg); 159 160 isb(); 161 } 162 163 static int 164 arm64_allocate_pmc(int cpu, int ri, struct pmc *pm, 165 const struct pmc_op_pmcallocate *a) 166 { 167 uint32_t caps, config; 168 struct arm64_cpu *pac; 169 enum pmc_event pe; 170 171 KASSERT(cpu >= 0 && cpu < pmc_cpu_max(), 172 ("[arm64,%d] illegal CPU value %d", __LINE__, cpu)); 173 KASSERT(ri >= 0 && ri < arm64_npmcs, 174 ("[arm64,%d] illegal row index %d", __LINE__, ri)); 175 176 pac = arm64_pcpu[cpu]; 177 178 caps = a->pm_caps; 179 if (a->pm_class != PMC_CLASS_ARMV8) { 180 return (EINVAL); 181 } 182 pe = a->pm_ev; 183 184 config = (pe & EVENT_ID_MASK); 185 pm->pm_md.pm_arm64.pm_arm64_evsel = config; 186 187 PMCDBG2(MDP, ALL, 2, "arm64-allocate ri=%d -> config=0x%x", ri, config); 188 189 return 0; 190 } 191 192 193 static int 194 arm64_read_pmc(int cpu, int ri, pmc_value_t *v) 195 { 196 pmc_value_t tmp; 197 struct pmc *pm; 198 199 KASSERT(cpu >= 0 && cpu < pmc_cpu_max(), 200 ("[arm64,%d] illegal CPU value %d", __LINE__, cpu)); 201 KASSERT(ri >= 0 && ri < arm64_npmcs, 202 ("[arm64,%d] illegal row index %d", __LINE__, ri)); 203 204 pm = arm64_pcpu[cpu]->pc_arm64pmcs[ri].phw_pmc; 205 206 tmp = arm64_pmcn_read(ri); 207 208 PMCDBG2(MDP, REA, 2, "arm64-read id=%d -> %jd", ri, tmp); 209 if (PMC_IS_SAMPLING_MODE(PMC_TO_MODE(pm))) 210 *v = ARMV8_PERFCTR_VALUE_TO_RELOAD_COUNT(tmp); 211 else 212 *v = tmp; 213 214 return 0; 215 } 216 217 static int 218 arm64_write_pmc(int cpu, int ri, pmc_value_t v) 219 { 220 struct pmc *pm; 221 222 KASSERT(cpu >= 0 && cpu < pmc_cpu_max(), 223 ("[arm64,%d] illegal CPU value %d", __LINE__, cpu)); 224 KASSERT(ri >= 0 && ri < arm64_npmcs, 225 ("[arm64,%d] illegal row-index %d", __LINE__, ri)); 226 227 pm = arm64_pcpu[cpu]->pc_arm64pmcs[ri].phw_pmc; 228 229 if (PMC_IS_SAMPLING_MODE(PMC_TO_MODE(pm))) 230 v = ARMV8_RELOAD_COUNT_TO_PERFCTR_VALUE(v); 231 232 PMCDBG3(MDP, WRI, 1, "arm64-write cpu=%d ri=%d v=%jx", cpu, ri, v); 233 234 arm64_pmcn_write(ri, v); 235 236 return 0; 237 } 238 239 static int 240 arm64_config_pmc(int cpu, int ri, struct pmc *pm) 241 { 242 struct pmc_hw *phw; 243 244 PMCDBG3(MDP, CFG, 1, "cpu=%d ri=%d pm=%p", cpu, ri, pm); 245 246 KASSERT(cpu >= 0 && cpu < pmc_cpu_max(), 247 ("[arm64,%d] illegal CPU value %d", __LINE__, cpu)); 248 KASSERT(ri >= 0 && ri < arm64_npmcs, 249 ("[arm64,%d] illegal row-index %d", __LINE__, ri)); 250 251 phw = &arm64_pcpu[cpu]->pc_arm64pmcs[ri]; 252 253 KASSERT(pm == NULL || phw->phw_pmc == NULL, 254 ("[arm64,%d] pm=%p phw->pm=%p hwpmc not unconfigured", 255 __LINE__, pm, phw->phw_pmc)); 256 257 phw->phw_pmc = pm; 258 259 return 0; 260 } 261 262 static int 263 arm64_start_pmc(int cpu, int ri) 264 { 265 struct pmc_hw *phw; 266 uint32_t config; 267 struct pmc *pm; 268 269 phw = &arm64_pcpu[cpu]->pc_arm64pmcs[ri]; 270 pm = phw->phw_pmc; 271 config = pm->pm_md.pm_arm64.pm_arm64_evsel; 272 273 /* 274 * Configure the event selection. 275 */ 276 WRITE_SPECIALREG(PMSELR_EL0, ri); 277 WRITE_SPECIALREG(PMXEVTYPER_EL0, config); 278 279 isb(); 280 281 /* 282 * Enable the PMC. 283 */ 284 arm64_interrupt_enable(ri); 285 arm64_counter_enable(ri); 286 287 return 0; 288 } 289 290 static int 291 arm64_stop_pmc(int cpu, int ri) 292 { 293 struct pmc_hw *phw; 294 struct pmc *pm; 295 296 phw = &arm64_pcpu[cpu]->pc_arm64pmcs[ri]; 297 pm = phw->phw_pmc; 298 299 /* 300 * Disable the PMCs. 301 */ 302 arm64_counter_disable(ri); 303 arm64_interrupt_disable(ri); 304 305 return 0; 306 } 307 308 static int 309 arm64_release_pmc(int cpu, int ri, struct pmc *pmc) 310 { 311 struct pmc_hw *phw; 312 313 KASSERT(cpu >= 0 && cpu < pmc_cpu_max(), 314 ("[arm64,%d] illegal CPU value %d", __LINE__, cpu)); 315 KASSERT(ri >= 0 && ri < arm64_npmcs, 316 ("[arm64,%d] illegal row-index %d", __LINE__, ri)); 317 318 phw = &arm64_pcpu[cpu]->pc_arm64pmcs[ri]; 319 KASSERT(phw->phw_pmc == NULL, 320 ("[arm64,%d] PHW pmc %p non-NULL", __LINE__, phw->phw_pmc)); 321 322 return 0; 323 } 324 325 static int 326 arm64_intr(int cpu, struct trapframe *tf) 327 { 328 struct arm64_cpu *pc; 329 int retval, ri; 330 struct pmc *pm; 331 int error; 332 int reg; 333 334 KASSERT(cpu >= 0 && cpu < pmc_cpu_max(), 335 ("[arm64,%d] CPU %d out of range", __LINE__, cpu)); 336 337 retval = 0; 338 pc = arm64_pcpu[cpu]; 339 340 for (ri = 0; ri < arm64_npmcs; ri++) { 341 pm = arm64_pcpu[cpu]->pc_arm64pmcs[ri].phw_pmc; 342 if (pm == NULL) 343 continue; 344 if (!PMC_IS_SAMPLING_MODE(PMC_TO_MODE(pm))) 345 continue; 346 347 /* Check if counter is overflowed */ 348 reg = (1 << ri); 349 if ((READ_SPECIALREG(PMOVSCLR_EL0) & reg) == 0) 350 continue; 351 /* Clear Overflow Flag */ 352 WRITE_SPECIALREG(PMOVSCLR_EL0, reg); 353 354 isb(); 355 356 retval = 1; /* Found an interrupting PMC. */ 357 if (pm->pm_state != PMC_STATE_RUNNING) 358 continue; 359 360 error = pmc_process_interrupt(cpu, PMC_HR, pm, tf, 361 TRAPF_USERMODE(tf)); 362 if (error) 363 arm64_stop_pmc(cpu, ri); 364 365 /* Reload sampling count */ 366 arm64_write_pmc(cpu, ri, pm->pm_sc.pm_reloadcount); 367 } 368 369 return (retval); 370 } 371 372 static int 373 arm64_describe(int cpu, int ri, struct pmc_info *pi, struct pmc **ppmc) 374 { 375 char arm64_name[PMC_NAME_MAX]; 376 struct pmc_hw *phw; 377 int error; 378 379 KASSERT(cpu >= 0 && cpu < pmc_cpu_max(), 380 ("[arm64,%d], illegal CPU %d", __LINE__, cpu)); 381 KASSERT(ri >= 0 && ri < arm64_npmcs, 382 ("[arm64,%d] row-index %d out of range", __LINE__, ri)); 383 384 phw = &arm64_pcpu[cpu]->pc_arm64pmcs[ri]; 385 snprintf(arm64_name, sizeof(arm64_name), "ARMV8-%d", ri); 386 if ((error = copystr(arm64_name, pi->pm_name, PMC_NAME_MAX, 387 NULL)) != 0) 388 return (error); 389 pi->pm_class = PMC_CLASS_ARMV8; 390 if (phw->phw_state & PMC_PHW_FLAG_IS_ENABLED) { 391 pi->pm_enabled = TRUE; 392 *ppmc = phw->phw_pmc; 393 } else { 394 pi->pm_enabled = FALSE; 395 *ppmc = NULL; 396 } 397 398 return (0); 399 } 400 401 static int 402 arm64_get_config(int cpu, int ri, struct pmc **ppm) 403 { 404 405 *ppm = arm64_pcpu[cpu]->pc_arm64pmcs[ri].phw_pmc; 406 407 return (0); 408 } 409 410 /* 411 * XXX don't know what we should do here. 412 */ 413 static int 414 arm64_switch_in(struct pmc_cpu *pc, struct pmc_process *pp) 415 { 416 417 return (0); 418 } 419 420 static int 421 arm64_switch_out(struct pmc_cpu *pc, struct pmc_process *pp) 422 { 423 424 return (0); 425 } 426 427 static int 428 arm64_pcpu_init(struct pmc_mdep *md, int cpu) 429 { 430 struct arm64_cpu *pac; 431 struct pmc_hw *phw; 432 struct pmc_cpu *pc; 433 uint64_t pmcr; 434 int first_ri; 435 int i; 436 437 KASSERT(cpu >= 0 && cpu < pmc_cpu_max(), 438 ("[arm64,%d] wrong cpu number %d", __LINE__, cpu)); 439 PMCDBG1(MDP, INI, 1, "arm64-init cpu=%d", cpu); 440 441 arm64_pcpu[cpu] = pac = malloc(sizeof(struct arm64_cpu), M_PMC, 442 M_WAITOK | M_ZERO); 443 444 pac->pc_arm64pmcs = malloc(sizeof(struct pmc_hw) * arm64_npmcs, 445 M_PMC, M_WAITOK | M_ZERO); 446 pc = pmc_pcpu[cpu]; 447 first_ri = md->pmd_classdep[PMC_MDEP_CLASS_INDEX_ARMV8].pcd_ri; 448 KASSERT(pc != NULL, ("[arm64,%d] NULL per-cpu pointer", __LINE__)); 449 450 for (i = 0, phw = pac->pc_arm64pmcs; i < arm64_npmcs; i++, phw++) { 451 phw->phw_state = PMC_PHW_FLAG_IS_ENABLED | 452 PMC_PHW_CPU_TO_STATE(cpu) | PMC_PHW_INDEX_TO_STATE(i); 453 phw->phw_pmc = NULL; 454 pc->pc_hwpmcs[i + first_ri] = phw; 455 } 456 457 /* Enable unit */ 458 pmcr = arm64_pmcr_read(); 459 pmcr |= PMCR_E; 460 arm64_pmcr_write(pmcr); 461 462 return (0); 463 } 464 465 static int 466 arm64_pcpu_fini(struct pmc_mdep *md, int cpu) 467 { 468 uint32_t pmcr; 469 470 pmcr = arm64_pmcr_read(); 471 pmcr &= ~PMCR_E; 472 arm64_pmcr_write(pmcr); 473 474 return (0); 475 } 476 477 struct pmc_mdep * 478 pmc_arm64_initialize() 479 { 480 struct pmc_mdep *pmc_mdep; 481 struct pmc_classdep *pcd; 482 int idcode; 483 int reg; 484 485 reg = arm64_pmcr_read(); 486 arm64_npmcs = (reg & PMCR_N_MASK) >> PMCR_N_SHIFT; 487 idcode = (reg & PMCR_IDCODE_MASK) >> PMCR_IDCODE_SHIFT; 488 489 PMCDBG1(MDP, INI, 1, "arm64-init npmcs=%d", arm64_npmcs); 490 491 /* 492 * Allocate space for pointers to PMC HW descriptors and for 493 * the MDEP structure used by MI code. 494 */ 495 arm64_pcpu = malloc(sizeof(struct arm64_cpu *) * pmc_cpu_max(), 496 M_PMC, M_WAITOK | M_ZERO); 497 498 /* Just one class */ 499 pmc_mdep = pmc_mdep_alloc(1); 500 501 switch (idcode) { 502 case PMCR_IDCODE_CORTEX_A57: 503 case PMCR_IDCODE_CORTEX_A72: 504 pmc_mdep->pmd_cputype = PMC_CPU_ARMV8_CORTEX_A57; 505 break; 506 default: 507 case PMCR_IDCODE_CORTEX_A53: 508 pmc_mdep->pmd_cputype = PMC_CPU_ARMV8_CORTEX_A53; 509 break; 510 } 511 512 pcd = &pmc_mdep->pmd_classdep[PMC_MDEP_CLASS_INDEX_ARMV8]; 513 pcd->pcd_caps = ARMV8_PMC_CAPS; 514 pcd->pcd_class = PMC_CLASS_ARMV8; 515 pcd->pcd_num = arm64_npmcs; 516 pcd->pcd_ri = pmc_mdep->pmd_npmc; 517 pcd->pcd_width = 32; 518 519 pcd->pcd_allocate_pmc = arm64_allocate_pmc; 520 pcd->pcd_config_pmc = arm64_config_pmc; 521 pcd->pcd_pcpu_fini = arm64_pcpu_fini; 522 pcd->pcd_pcpu_init = arm64_pcpu_init; 523 pcd->pcd_describe = arm64_describe; 524 pcd->pcd_get_config = arm64_get_config; 525 pcd->pcd_read_pmc = arm64_read_pmc; 526 pcd->pcd_release_pmc = arm64_release_pmc; 527 pcd->pcd_start_pmc = arm64_start_pmc; 528 pcd->pcd_stop_pmc = arm64_stop_pmc; 529 pcd->pcd_write_pmc = arm64_write_pmc; 530 531 pmc_mdep->pmd_intr = arm64_intr; 532 pmc_mdep->pmd_switch_in = arm64_switch_in; 533 pmc_mdep->pmd_switch_out = arm64_switch_out; 534 535 pmc_mdep->pmd_npmc += arm64_npmcs; 536 537 return (pmc_mdep); 538 } 539 540 void 541 pmc_arm64_finalize(struct pmc_mdep *md) 542 { 543 544 } 545