1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright (c) 2014, The Linux Foundation. All rights reserved. 4 */ 5 6 #include <linux/acpi.h> 7 #include <linux/bitops.h> 8 #include <linux/kernel.h> 9 #include <linux/moduleparam.h> 10 #include <linux/init.h> 11 #include <linux/types.h> 12 #include <linux/device.h> 13 #include <linux/io.h> 14 #include <linux/err.h> 15 #include <linux/fs.h> 16 #include <linux/slab.h> 17 #include <linux/delay.h> 18 #include <linux/smp.h> 19 #include <linux/sysfs.h> 20 #include <linux/stat.h> 21 #include <linux/clk.h> 22 #include <linux/cpu.h> 23 #include <linux/cpu_pm.h> 24 #include <linux/coresight.h> 25 #include <linux/coresight-pmu.h> 26 #include <linux/pm_wakeup.h> 27 #include <linux/amba/bus.h> 28 #include <linux/seq_file.h> 29 #include <linux/uaccess.h> 30 #include <linux/perf_event.h> 31 #include <linux/platform_device.h> 32 #include <linux/pm_runtime.h> 33 #include <linux/property.h> 34 #include <linux/clk/clk-conf.h> 35 36 #include <asm/barrier.h> 37 #include <asm/sections.h> 38 #include <asm/sysreg.h> 39 #include <asm/local.h> 40 #include <asm/virt.h> 41 42 #include "coresight-etm4x.h" 43 #include "coresight-etm-perf.h" 44 #include "coresight-etm4x-cfg.h" 45 #include "coresight-self-hosted-trace.h" 46 #include "coresight-syscfg.h" 47 #include "coresight-trace-id.h" 48 49 static int boot_enable; 50 module_param(boot_enable, int, 0444); 51 MODULE_PARM_DESC(boot_enable, "Enable tracing on boot"); 52 53 #define PARAM_PM_SAVE_FIRMWARE 0 /* save self-hosted state as per firmware */ 54 #define PARAM_PM_SAVE_NEVER 1 /* never save any state */ 55 #define PARAM_PM_SAVE_SELF_HOSTED 2 /* save self-hosted state only */ 56 57 static int pm_save_enable = PARAM_PM_SAVE_FIRMWARE; 58 module_param(pm_save_enable, int, 0444); 59 MODULE_PARM_DESC(pm_save_enable, 60 "Save/restore state on power down: 1 = never, 2 = self-hosted"); 61 62 static struct etmv4_drvdata *etmdrvdata[NR_CPUS]; 63 static void etm4_set_default_config(struct etmv4_config *config); 64 static int etm4_set_event_filters(struct etmv4_drvdata *drvdata, 65 struct perf_event *event); 66 static u64 etm4_get_access_type(struct etmv4_config *config); 67 68 static enum cpuhp_state hp_online; 69 70 struct etm4_init_arg { 71 struct device *dev; 72 struct csdev_access *csa; 73 }; 74 75 static DEFINE_PER_CPU(struct etm4_init_arg *, delayed_probe); 76 static int etm4_probe_cpu(unsigned int cpu); 77 78 /* 79 * Check if TRCSSPCICRn(i) is implemented for a given instance. 80 * 81 * TRCSSPCICRn is implemented only if : 82 * TRCSSPCICR<n> is present only if all of the following are true: 83 * TRCIDR4.NUMSSCC > n. 84 * TRCIDR4.NUMPC > 0b0000 . 85 * TRCSSCSR<n>.PC == 0b1 86 */ 87 static inline bool etm4x_sspcicrn_present(struct etmv4_drvdata *drvdata, int n) 88 { 89 return (n < drvdata->nr_ss_cmp) && 90 drvdata->nr_pe && 91 (drvdata->config.ss_status[n] & TRCSSCSRn_PC); 92 } 93 94 u64 etm4x_sysreg_read(u32 offset, bool _relaxed, bool _64bit) 95 { 96 u64 res = 0; 97 98 switch (offset) { 99 ETM4x_READ_SYSREG_CASES(res) 100 default : 101 pr_warn_ratelimited("etm4x: trying to read unsupported register @%x\n", 102 offset); 103 } 104 105 if (!_relaxed) 106 __io_ar(res); /* Imitate the !relaxed I/O helpers */ 107 108 return res; 109 } 110 111 void etm4x_sysreg_write(u64 val, u32 offset, bool _relaxed, bool _64bit) 112 { 113 if (!_relaxed) 114 __io_bw(); /* Imitate the !relaxed I/O helpers */ 115 if (!_64bit) 116 val &= GENMASK(31, 0); 117 118 switch (offset) { 119 ETM4x_WRITE_SYSREG_CASES(val) 120 default : 121 pr_warn_ratelimited("etm4x: trying to write to unsupported register @%x\n", 122 offset); 123 } 124 } 125 126 static u64 ete_sysreg_read(u32 offset, bool _relaxed, bool _64bit) 127 { 128 u64 res = 0; 129 130 switch (offset) { 131 ETE_READ_CASES(res) 132 default : 133 pr_warn_ratelimited("ete: trying to read unsupported register @%x\n", 134 offset); 135 } 136 137 if (!_relaxed) 138 __io_ar(res); /* Imitate the !relaxed I/O helpers */ 139 140 return res; 141 } 142 143 static void ete_sysreg_write(u64 val, u32 offset, bool _relaxed, bool _64bit) 144 { 145 if (!_relaxed) 146 __io_bw(); /* Imitate the !relaxed I/O helpers */ 147 if (!_64bit) 148 val &= GENMASK(31, 0); 149 150 switch (offset) { 151 ETE_WRITE_CASES(val) 152 default : 153 pr_warn_ratelimited("ete: trying to write to unsupported register @%x\n", 154 offset); 155 } 156 } 157 158 static void etm_detect_os_lock(struct etmv4_drvdata *drvdata, 159 struct csdev_access *csa) 160 { 161 u32 oslsr = etm4x_relaxed_read32(csa, TRCOSLSR); 162 163 drvdata->os_lock_model = ETM_OSLSR_OSLM(oslsr); 164 } 165 166 static void etm_write_os_lock(struct etmv4_drvdata *drvdata, 167 struct csdev_access *csa, u32 val) 168 { 169 val = !!val; 170 171 switch (drvdata->os_lock_model) { 172 case ETM_OSLOCK_PRESENT: 173 etm4x_relaxed_write32(csa, val, TRCOSLAR); 174 break; 175 case ETM_OSLOCK_PE: 176 write_sysreg_s(val, SYS_OSLAR_EL1); 177 break; 178 default: 179 pr_warn_once("CPU%d: Unsupported Trace OSLock model: %x\n", 180 smp_processor_id(), drvdata->os_lock_model); 181 fallthrough; 182 case ETM_OSLOCK_NI: 183 return; 184 } 185 isb(); 186 } 187 188 static inline void etm4_os_unlock_csa(struct etmv4_drvdata *drvdata, 189 struct csdev_access *csa) 190 { 191 WARN_ON(drvdata->cpu != smp_processor_id()); 192 193 /* Writing 0 to OS Lock unlocks the trace unit registers */ 194 etm_write_os_lock(drvdata, csa, 0x0); 195 drvdata->os_unlock = true; 196 } 197 198 static void etm4_os_unlock(struct etmv4_drvdata *drvdata) 199 { 200 if (!WARN_ON(!drvdata->csdev)) 201 etm4_os_unlock_csa(drvdata, &drvdata->csdev->access); 202 } 203 204 static void etm4_os_lock(struct etmv4_drvdata *drvdata) 205 { 206 if (WARN_ON(!drvdata->csdev)) 207 return; 208 /* Writing 0x1 to OS Lock locks the trace registers */ 209 etm_write_os_lock(drvdata, &drvdata->csdev->access, 0x1); 210 drvdata->os_unlock = false; 211 } 212 213 static void etm4_cs_lock(struct etmv4_drvdata *drvdata, 214 struct csdev_access *csa) 215 { 216 /* Software Lock is only accessible via memory mapped interface */ 217 if (csa->io_mem) 218 CS_LOCK(csa->base); 219 } 220 221 static void etm4_cs_unlock(struct etmv4_drvdata *drvdata, 222 struct csdev_access *csa) 223 { 224 if (csa->io_mem) 225 CS_UNLOCK(csa->base); 226 } 227 228 static int etm4_cpu_id(struct coresight_device *csdev) 229 { 230 struct etmv4_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); 231 232 return drvdata->cpu; 233 } 234 235 int etm4_read_alloc_trace_id(struct etmv4_drvdata *drvdata) 236 { 237 int trace_id; 238 239 /* 240 * This will allocate a trace ID to the cpu, 241 * or return the one currently allocated. 242 * The trace id function has its own lock 243 */ 244 trace_id = coresight_trace_id_get_cpu_id(drvdata->cpu); 245 if (IS_VALID_CS_TRACE_ID(trace_id)) 246 drvdata->trcid = (u8)trace_id; 247 else 248 dev_err(&drvdata->csdev->dev, 249 "Failed to allocate trace ID for %s on CPU%d\n", 250 dev_name(&drvdata->csdev->dev), drvdata->cpu); 251 return trace_id; 252 } 253 254 void etm4_release_trace_id(struct etmv4_drvdata *drvdata) 255 { 256 coresight_trace_id_put_cpu_id(drvdata->cpu); 257 } 258 259 struct etm4_enable_arg { 260 struct etmv4_drvdata *drvdata; 261 int rc; 262 }; 263 264 /* 265 * etm4x_prohibit_trace - Prohibit the CPU from tracing at all ELs. 266 * When the CPU supports FEAT_TRF, we could move the ETM to a trace 267 * prohibited state by filtering the Exception levels via TRFCR_EL1. 268 */ 269 static void etm4x_prohibit_trace(struct etmv4_drvdata *drvdata) 270 { 271 /* If the CPU doesn't support FEAT_TRF, nothing to do */ 272 if (!drvdata->trfcr) 273 return; 274 cpu_prohibit_trace(); 275 } 276 277 /* 278 * etm4x_allow_trace - Allow CPU tracing in the respective ELs, 279 * as configured by the drvdata->config.mode for the current 280 * session. Even though we have TRCVICTLR bits to filter the 281 * trace in the ELs, it doesn't prevent the ETM from generating 282 * a packet (e.g, TraceInfo) that might contain the addresses from 283 * the excluded levels. Thus we use the additional controls provided 284 * via the Trace Filtering controls (FEAT_TRF) to make sure no trace 285 * is generated for the excluded ELs. 286 */ 287 static void etm4x_allow_trace(struct etmv4_drvdata *drvdata) 288 { 289 u64 trfcr = drvdata->trfcr; 290 291 /* If the CPU doesn't support FEAT_TRF, nothing to do */ 292 if (!trfcr) 293 return; 294 295 if (drvdata->config.mode & ETM_MODE_EXCL_KERN) 296 trfcr &= ~TRFCR_ELx_ExTRE; 297 if (drvdata->config.mode & ETM_MODE_EXCL_USER) 298 trfcr &= ~TRFCR_ELx_E0TRE; 299 300 write_trfcr(trfcr); 301 } 302 303 #ifdef CONFIG_ETM4X_IMPDEF_FEATURE 304 305 #define HISI_HIP08_AMBA_ID 0x000b6d01 306 #define ETM4_AMBA_MASK 0xfffff 307 #define HISI_HIP08_CORE_COMMIT_MASK 0x3000 308 #define HISI_HIP08_CORE_COMMIT_SHIFT 12 309 #define HISI_HIP08_CORE_COMMIT_FULL 0b00 310 #define HISI_HIP08_CORE_COMMIT_LVL_1 0b01 311 #define HISI_HIP08_CORE_COMMIT_REG sys_reg(3, 1, 15, 2, 5) 312 313 struct etm4_arch_features { 314 void (*arch_callback)(bool enable); 315 }; 316 317 static bool etm4_hisi_match_pid(unsigned int id) 318 { 319 return (id & ETM4_AMBA_MASK) == HISI_HIP08_AMBA_ID; 320 } 321 322 static void etm4_hisi_config_core_commit(bool enable) 323 { 324 u8 commit = enable ? HISI_HIP08_CORE_COMMIT_LVL_1 : 325 HISI_HIP08_CORE_COMMIT_FULL; 326 u64 val; 327 328 /* 329 * bit 12 and 13 of HISI_HIP08_CORE_COMMIT_REG are used together 330 * to set core-commit, 2'b00 means cpu is at full speed, 2'b01, 331 * 2'b10, 2'b11 mean reduce pipeline speed, and 2'b01 means level-1 332 * speed(minimun value). So bit 12 and 13 should be cleared together. 333 */ 334 val = read_sysreg_s(HISI_HIP08_CORE_COMMIT_REG); 335 val &= ~HISI_HIP08_CORE_COMMIT_MASK; 336 val |= commit << HISI_HIP08_CORE_COMMIT_SHIFT; 337 write_sysreg_s(val, HISI_HIP08_CORE_COMMIT_REG); 338 } 339 340 static struct etm4_arch_features etm4_features[] = { 341 [ETM4_IMPDEF_HISI_CORE_COMMIT] = { 342 .arch_callback = etm4_hisi_config_core_commit, 343 }, 344 {}, 345 }; 346 347 static void etm4_enable_arch_specific(struct etmv4_drvdata *drvdata) 348 { 349 struct etm4_arch_features *ftr; 350 int bit; 351 352 for_each_set_bit(bit, drvdata->arch_features, ETM4_IMPDEF_FEATURE_MAX) { 353 ftr = &etm4_features[bit]; 354 355 if (ftr->arch_callback) 356 ftr->arch_callback(true); 357 } 358 } 359 360 static void etm4_disable_arch_specific(struct etmv4_drvdata *drvdata) 361 { 362 struct etm4_arch_features *ftr; 363 int bit; 364 365 for_each_set_bit(bit, drvdata->arch_features, ETM4_IMPDEF_FEATURE_MAX) { 366 ftr = &etm4_features[bit]; 367 368 if (ftr->arch_callback) 369 ftr->arch_callback(false); 370 } 371 } 372 373 static void etm4_check_arch_features(struct etmv4_drvdata *drvdata, 374 struct csdev_access *csa) 375 { 376 /* 377 * TRCPIDR* registers are not required for ETMs with system 378 * instructions. They must be identified by the MIDR+REVIDRs. 379 * Skip the TRCPID checks for now. 380 */ 381 if (!csa->io_mem) 382 return; 383 384 if (etm4_hisi_match_pid(coresight_get_pid(csa))) 385 set_bit(ETM4_IMPDEF_HISI_CORE_COMMIT, drvdata->arch_features); 386 } 387 #else 388 static void etm4_enable_arch_specific(struct etmv4_drvdata *drvdata) 389 { 390 } 391 392 static void etm4_disable_arch_specific(struct etmv4_drvdata *drvdata) 393 { 394 } 395 396 static void etm4_check_arch_features(struct etmv4_drvdata *drvdata, 397 struct csdev_access *csa) 398 { 399 } 400 #endif /* CONFIG_ETM4X_IMPDEF_FEATURE */ 401 402 static int etm4_enable_hw(struct etmv4_drvdata *drvdata) 403 { 404 int i, rc; 405 struct etmv4_config *config = &drvdata->config; 406 struct coresight_device *csdev = drvdata->csdev; 407 struct device *etm_dev = &csdev->dev; 408 struct csdev_access *csa = &csdev->access; 409 410 411 etm4_cs_unlock(drvdata, csa); 412 etm4_enable_arch_specific(drvdata); 413 414 etm4_os_unlock(drvdata); 415 416 rc = coresight_claim_device_unlocked(csdev); 417 if (rc) 418 goto done; 419 420 /* Disable the trace unit before programming trace registers */ 421 etm4x_relaxed_write32(csa, 0, TRCPRGCTLR); 422 423 /* 424 * If we use system instructions, we need to synchronize the 425 * write to the TRCPRGCTLR, before accessing the TRCSTATR. 426 * See ARM IHI0064F, section 427 * "4.3.7 Synchronization of register updates" 428 */ 429 if (!csa->io_mem) 430 isb(); 431 432 /* wait for TRCSTATR.IDLE to go up */ 433 if (coresight_timeout(csa, TRCSTATR, TRCSTATR_IDLE_BIT, 1)) 434 dev_err(etm_dev, 435 "timeout while waiting for Idle Trace Status\n"); 436 if (drvdata->nr_pe) 437 etm4x_relaxed_write32(csa, config->pe_sel, TRCPROCSELR); 438 etm4x_relaxed_write32(csa, config->cfg, TRCCONFIGR); 439 /* nothing specific implemented */ 440 etm4x_relaxed_write32(csa, 0x0, TRCAUXCTLR); 441 etm4x_relaxed_write32(csa, config->eventctrl0, TRCEVENTCTL0R); 442 etm4x_relaxed_write32(csa, config->eventctrl1, TRCEVENTCTL1R); 443 if (drvdata->stallctl) 444 etm4x_relaxed_write32(csa, config->stall_ctrl, TRCSTALLCTLR); 445 etm4x_relaxed_write32(csa, config->ts_ctrl, TRCTSCTLR); 446 etm4x_relaxed_write32(csa, config->syncfreq, TRCSYNCPR); 447 etm4x_relaxed_write32(csa, config->ccctlr, TRCCCCTLR); 448 etm4x_relaxed_write32(csa, config->bb_ctrl, TRCBBCTLR); 449 etm4x_relaxed_write32(csa, drvdata->trcid, TRCTRACEIDR); 450 etm4x_relaxed_write32(csa, config->vinst_ctrl, TRCVICTLR); 451 etm4x_relaxed_write32(csa, config->viiectlr, TRCVIIECTLR); 452 etm4x_relaxed_write32(csa, config->vissctlr, TRCVISSCTLR); 453 if (drvdata->nr_pe_cmp) 454 etm4x_relaxed_write32(csa, config->vipcssctlr, TRCVIPCSSCTLR); 455 for (i = 0; i < drvdata->nrseqstate - 1; i++) 456 etm4x_relaxed_write32(csa, config->seq_ctrl[i], TRCSEQEVRn(i)); 457 if (drvdata->nrseqstate) { 458 etm4x_relaxed_write32(csa, config->seq_rst, TRCSEQRSTEVR); 459 etm4x_relaxed_write32(csa, config->seq_state, TRCSEQSTR); 460 } 461 etm4x_relaxed_write32(csa, config->ext_inp, TRCEXTINSELR); 462 for (i = 0; i < drvdata->nr_cntr; i++) { 463 etm4x_relaxed_write32(csa, config->cntrldvr[i], TRCCNTRLDVRn(i)); 464 etm4x_relaxed_write32(csa, config->cntr_ctrl[i], TRCCNTCTLRn(i)); 465 etm4x_relaxed_write32(csa, config->cntr_val[i], TRCCNTVRn(i)); 466 } 467 468 /* 469 * Resource selector pair 0 is always implemented and reserved. As 470 * such start at 2. 471 */ 472 for (i = 2; i < drvdata->nr_resource * 2; i++) 473 etm4x_relaxed_write32(csa, config->res_ctrl[i], TRCRSCTLRn(i)); 474 475 for (i = 0; i < drvdata->nr_ss_cmp; i++) { 476 /* always clear status bit on restart if using single-shot */ 477 if (config->ss_ctrl[i] || config->ss_pe_cmp[i]) 478 config->ss_status[i] &= ~TRCSSCSRn_STATUS; 479 etm4x_relaxed_write32(csa, config->ss_ctrl[i], TRCSSCCRn(i)); 480 etm4x_relaxed_write32(csa, config->ss_status[i], TRCSSCSRn(i)); 481 if (etm4x_sspcicrn_present(drvdata, i)) 482 etm4x_relaxed_write32(csa, config->ss_pe_cmp[i], TRCSSPCICRn(i)); 483 } 484 for (i = 0; i < drvdata->nr_addr_cmp * 2; i++) { 485 etm4x_relaxed_write64(csa, config->addr_val[i], TRCACVRn(i)); 486 etm4x_relaxed_write64(csa, config->addr_acc[i], TRCACATRn(i)); 487 } 488 for (i = 0; i < drvdata->numcidc; i++) 489 etm4x_relaxed_write64(csa, config->ctxid_pid[i], TRCCIDCVRn(i)); 490 etm4x_relaxed_write32(csa, config->ctxid_mask0, TRCCIDCCTLR0); 491 if (drvdata->numcidc > 4) 492 etm4x_relaxed_write32(csa, config->ctxid_mask1, TRCCIDCCTLR1); 493 494 for (i = 0; i < drvdata->numvmidc; i++) 495 etm4x_relaxed_write64(csa, config->vmid_val[i], TRCVMIDCVRn(i)); 496 etm4x_relaxed_write32(csa, config->vmid_mask0, TRCVMIDCCTLR0); 497 if (drvdata->numvmidc > 4) 498 etm4x_relaxed_write32(csa, config->vmid_mask1, TRCVMIDCCTLR1); 499 500 if (!drvdata->skip_power_up) { 501 u32 trcpdcr = etm4x_relaxed_read32(csa, TRCPDCR); 502 503 /* 504 * Request to keep the trace unit powered and also 505 * emulation of powerdown 506 */ 507 etm4x_relaxed_write32(csa, trcpdcr | TRCPDCR_PU, TRCPDCR); 508 } 509 510 /* 511 * ETE mandates that the TRCRSR is written to before 512 * enabling it. 513 */ 514 if (etm4x_is_ete(drvdata)) 515 etm4x_relaxed_write32(csa, TRCRSR_TA, TRCRSR); 516 517 etm4x_allow_trace(drvdata); 518 /* Enable the trace unit */ 519 etm4x_relaxed_write32(csa, 1, TRCPRGCTLR); 520 521 /* Synchronize the register updates for sysreg access */ 522 if (!csa->io_mem) 523 isb(); 524 525 /* wait for TRCSTATR.IDLE to go back down to '0' */ 526 if (coresight_timeout(csa, TRCSTATR, TRCSTATR_IDLE_BIT, 0)) 527 dev_err(etm_dev, 528 "timeout while waiting for Idle Trace Status\n"); 529 530 /* 531 * As recommended by section 4.3.7 ("Synchronization when using the 532 * memory-mapped interface") of ARM IHI 0064D 533 */ 534 dsb(sy); 535 isb(); 536 537 done: 538 etm4_cs_lock(drvdata, csa); 539 540 dev_dbg(etm_dev, "cpu: %d enable smp call done: %d\n", 541 drvdata->cpu, rc); 542 return rc; 543 } 544 545 static void etm4_enable_hw_smp_call(void *info) 546 { 547 struct etm4_enable_arg *arg = info; 548 549 if (WARN_ON(!arg)) 550 return; 551 arg->rc = etm4_enable_hw(arg->drvdata); 552 } 553 554 /* 555 * The goal of function etm4_config_timestamp_event() is to configure a 556 * counter that will tell the tracer to emit a timestamp packet when it 557 * reaches zero. This is done in order to get a more fine grained idea 558 * of when instructions are executed so that they can be correlated 559 * with execution on other CPUs. 560 * 561 * To do this the counter itself is configured to self reload and 562 * TRCRSCTLR1 (always true) used to get the counter to decrement. From 563 * there a resource selector is configured with the counter and the 564 * timestamp control register to use the resource selector to trigger the 565 * event that will insert a timestamp packet in the stream. 566 */ 567 static int etm4_config_timestamp_event(struct etmv4_drvdata *drvdata) 568 { 569 int ctridx, ret = -EINVAL; 570 int counter, rselector; 571 u32 val = 0; 572 struct etmv4_config *config = &drvdata->config; 573 574 /* No point in trying if we don't have at least one counter */ 575 if (!drvdata->nr_cntr) 576 goto out; 577 578 /* Find a counter that hasn't been initialised */ 579 for (ctridx = 0; ctridx < drvdata->nr_cntr; ctridx++) 580 if (config->cntr_val[ctridx] == 0) 581 break; 582 583 /* All the counters have been configured already, bail out */ 584 if (ctridx == drvdata->nr_cntr) { 585 pr_debug("%s: no available counter found\n", __func__); 586 ret = -ENOSPC; 587 goto out; 588 } 589 590 /* 591 * Searching for an available resource selector to use, starting at 592 * '2' since every implementation has at least 2 resource selector. 593 * ETMIDR4 gives the number of resource selector _pairs_, 594 * hence multiply by 2. 595 */ 596 for (rselector = 2; rselector < drvdata->nr_resource * 2; rselector++) 597 if (!config->res_ctrl[rselector]) 598 break; 599 600 if (rselector == drvdata->nr_resource * 2) { 601 pr_debug("%s: no available resource selector found\n", 602 __func__); 603 ret = -ENOSPC; 604 goto out; 605 } 606 607 /* Remember what counter we used */ 608 counter = 1 << ctridx; 609 610 /* 611 * Initialise original and reload counter value to the smallest 612 * possible value in order to get as much precision as we can. 613 */ 614 config->cntr_val[ctridx] = 1; 615 config->cntrldvr[ctridx] = 1; 616 617 /* Set the trace counter control register */ 618 val = 0x1 << 16 | /* Bit 16, reload counter automatically */ 619 0x0 << 7 | /* Select single resource selector */ 620 0x1; /* Resource selector 1, i.e always true */ 621 622 config->cntr_ctrl[ctridx] = val; 623 624 val = 0x2 << 16 | /* Group 0b0010 - Counter and sequencers */ 625 counter << 0; /* Counter to use */ 626 627 config->res_ctrl[rselector] = val; 628 629 val = 0x0 << 7 | /* Select single resource selector */ 630 rselector; /* Resource selector */ 631 632 config->ts_ctrl = val; 633 634 ret = 0; 635 out: 636 return ret; 637 } 638 639 static int etm4_parse_event_config(struct coresight_device *csdev, 640 struct perf_event *event) 641 { 642 int ret = 0; 643 struct etmv4_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); 644 struct etmv4_config *config = &drvdata->config; 645 struct perf_event_attr *attr = &event->attr; 646 unsigned long cfg_hash; 647 int preset, cc_threshold; 648 649 /* Clear configuration from previous run */ 650 memset(config, 0, sizeof(struct etmv4_config)); 651 652 if (attr->exclude_kernel) 653 config->mode = ETM_MODE_EXCL_KERN; 654 655 if (attr->exclude_user) 656 config->mode = ETM_MODE_EXCL_USER; 657 658 /* Always start from the default config */ 659 etm4_set_default_config(config); 660 661 /* Configure filters specified on the perf cmd line, if any. */ 662 ret = etm4_set_event_filters(drvdata, event); 663 if (ret) 664 goto out; 665 666 /* Go from generic option to ETMv4 specifics */ 667 if (attr->config & BIT(ETM_OPT_CYCACC)) { 668 config->cfg |= TRCCONFIGR_CCI; 669 /* TRM: Must program this for cycacc to work */ 670 cc_threshold = attr->config3 & ETM_CYC_THRESHOLD_MASK; 671 if (!cc_threshold) 672 cc_threshold = ETM_CYC_THRESHOLD_DEFAULT; 673 if (cc_threshold < drvdata->ccitmin) 674 cc_threshold = drvdata->ccitmin; 675 config->ccctlr = cc_threshold; 676 } 677 if (attr->config & BIT(ETM_OPT_TS)) { 678 /* 679 * Configure timestamps to be emitted at regular intervals in 680 * order to correlate instructions executed on different CPUs 681 * (CPU-wide trace scenarios). 682 */ 683 ret = etm4_config_timestamp_event(drvdata); 684 685 /* 686 * No need to go further if timestamp intervals can't 687 * be configured. 688 */ 689 if (ret) 690 goto out; 691 692 /* bit[11], Global timestamp tracing bit */ 693 config->cfg |= TRCCONFIGR_TS; 694 } 695 696 /* Only trace contextID when runs in root PID namespace */ 697 if ((attr->config & BIT(ETM_OPT_CTXTID)) && 698 task_is_in_init_pid_ns(current)) 699 /* bit[6], Context ID tracing bit */ 700 config->cfg |= TRCCONFIGR_CID; 701 702 /* 703 * If set bit ETM_OPT_CTXTID2 in perf config, this asks to trace VMID 704 * for recording CONTEXTIDR_EL2. Do not enable VMID tracing if the 705 * kernel is not running in EL2. 706 */ 707 if (attr->config & BIT(ETM_OPT_CTXTID2)) { 708 if (!is_kernel_in_hyp_mode()) { 709 ret = -EINVAL; 710 goto out; 711 } 712 /* Only trace virtual contextID when runs in root PID namespace */ 713 if (task_is_in_init_pid_ns(current)) 714 config->cfg |= TRCCONFIGR_VMID | TRCCONFIGR_VMIDOPT; 715 } 716 717 /* return stack - enable if selected and supported */ 718 if ((attr->config & BIT(ETM_OPT_RETSTK)) && drvdata->retstack) 719 /* bit[12], Return stack enable bit */ 720 config->cfg |= TRCCONFIGR_RS; 721 722 /* 723 * Set any selected configuration and preset. 724 * 725 * This extracts the values of PMU_FORMAT_ATTR(configid) and PMU_FORMAT_ATTR(preset) 726 * in the perf attributes defined in coresight-etm-perf.c. 727 * configid uses bits 63:32 of attr->config2, preset uses bits 3:0 of attr->config. 728 * A zero configid means no configuration active, preset = 0 means no preset selected. 729 */ 730 if (attr->config2 & GENMASK_ULL(63, 32)) { 731 cfg_hash = (u32)(attr->config2 >> 32); 732 preset = attr->config & 0xF; 733 ret = cscfg_csdev_enable_active_config(csdev, cfg_hash, preset); 734 } 735 736 /* branch broadcast - enable if selected and supported */ 737 if (attr->config & BIT(ETM_OPT_BRANCH_BROADCAST)) { 738 if (!drvdata->trcbb) { 739 /* 740 * Missing BB support could cause silent decode errors 741 * so fail to open if it's not supported. 742 */ 743 ret = -EINVAL; 744 goto out; 745 } else { 746 config->cfg |= BIT(ETM4_CFG_BIT_BB); 747 } 748 } 749 750 out: 751 return ret; 752 } 753 754 static int etm4_enable_perf(struct coresight_device *csdev, 755 struct perf_event *event) 756 { 757 int ret = 0, trace_id; 758 struct etmv4_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); 759 760 if (WARN_ON_ONCE(drvdata->cpu != smp_processor_id())) { 761 ret = -EINVAL; 762 goto out; 763 } 764 765 /* Configure the tracer based on the session's specifics */ 766 ret = etm4_parse_event_config(csdev, event); 767 if (ret) 768 goto out; 769 770 /* 771 * perf allocates cpu ids as part of _setup_aux() - device needs to use 772 * the allocated ID. This reads the current version without allocation. 773 * 774 * This does not use the trace id lock to prevent lock_dep issues 775 * with perf locks - we know the ID cannot change until perf shuts down 776 * the session 777 */ 778 trace_id = coresight_trace_id_read_cpu_id(drvdata->cpu); 779 if (!IS_VALID_CS_TRACE_ID(trace_id)) { 780 dev_err(&drvdata->csdev->dev, "Failed to set trace ID for %s on CPU%d\n", 781 dev_name(&drvdata->csdev->dev), drvdata->cpu); 782 ret = -EINVAL; 783 goto out; 784 } 785 drvdata->trcid = (u8)trace_id; 786 787 /* And enable it */ 788 ret = etm4_enable_hw(drvdata); 789 790 out: 791 return ret; 792 } 793 794 static int etm4_enable_sysfs(struct coresight_device *csdev) 795 { 796 struct etmv4_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); 797 struct etm4_enable_arg arg = { }; 798 unsigned long cfg_hash; 799 int ret, preset; 800 801 /* enable any config activated by configfs */ 802 cscfg_config_sysfs_get_active_cfg(&cfg_hash, &preset); 803 if (cfg_hash) { 804 ret = cscfg_csdev_enable_active_config(csdev, cfg_hash, preset); 805 if (ret) 806 return ret; 807 } 808 809 spin_lock(&drvdata->spinlock); 810 811 /* sysfs needs to read and allocate a trace ID */ 812 ret = etm4_read_alloc_trace_id(drvdata); 813 if (ret < 0) 814 goto unlock_sysfs_enable; 815 816 /* 817 * Executing etm4_enable_hw on the cpu whose ETM is being enabled 818 * ensures that register writes occur when cpu is powered. 819 */ 820 arg.drvdata = drvdata; 821 ret = smp_call_function_single(drvdata->cpu, 822 etm4_enable_hw_smp_call, &arg, 1); 823 if (!ret) 824 ret = arg.rc; 825 if (!ret) 826 drvdata->sticky_enable = true; 827 828 if (ret) 829 etm4_release_trace_id(drvdata); 830 831 unlock_sysfs_enable: 832 spin_unlock(&drvdata->spinlock); 833 834 if (!ret) 835 dev_dbg(&csdev->dev, "ETM tracing enabled\n"); 836 return ret; 837 } 838 839 static int etm4_enable(struct coresight_device *csdev, struct perf_event *event, 840 enum cs_mode mode) 841 { 842 int ret; 843 844 if (!coresight_take_mode(csdev, mode)) { 845 /* Someone is already using the tracer */ 846 return -EBUSY; 847 } 848 849 switch (mode) { 850 case CS_MODE_SYSFS: 851 ret = etm4_enable_sysfs(csdev); 852 break; 853 case CS_MODE_PERF: 854 ret = etm4_enable_perf(csdev, event); 855 break; 856 default: 857 ret = -EINVAL; 858 } 859 860 /* The tracer didn't start */ 861 if (ret) 862 coresight_set_mode(csdev, CS_MODE_DISABLED); 863 864 return ret; 865 } 866 867 static void etm4_disable_hw(void *info) 868 { 869 u32 control; 870 struct etmv4_drvdata *drvdata = info; 871 struct etmv4_config *config = &drvdata->config; 872 struct coresight_device *csdev = drvdata->csdev; 873 struct device *etm_dev = &csdev->dev; 874 struct csdev_access *csa = &csdev->access; 875 int i; 876 877 etm4_cs_unlock(drvdata, csa); 878 etm4_disable_arch_specific(drvdata); 879 880 if (!drvdata->skip_power_up) { 881 /* power can be removed from the trace unit now */ 882 control = etm4x_relaxed_read32(csa, TRCPDCR); 883 control &= ~TRCPDCR_PU; 884 etm4x_relaxed_write32(csa, control, TRCPDCR); 885 } 886 887 control = etm4x_relaxed_read32(csa, TRCPRGCTLR); 888 889 /* EN, bit[0] Trace unit enable bit */ 890 control &= ~0x1; 891 892 /* 893 * If the CPU supports v8.4 Trace filter Control, 894 * set the ETM to trace prohibited region. 895 */ 896 etm4x_prohibit_trace(drvdata); 897 /* 898 * Make sure everything completes before disabling, as recommended 899 * by section 7.3.77 ("TRCVICTLR, ViewInst Main Control Register, 900 * SSTATUS") of ARM IHI 0064D 901 */ 902 dsb(sy); 903 isb(); 904 /* Trace synchronization barrier, is a nop if not supported */ 905 tsb_csync(); 906 etm4x_relaxed_write32(csa, control, TRCPRGCTLR); 907 908 /* wait for TRCSTATR.PMSTABLE to go to '1' */ 909 if (coresight_timeout(csa, TRCSTATR, TRCSTATR_PMSTABLE_BIT, 1)) 910 dev_err(etm_dev, 911 "timeout while waiting for PM stable Trace Status\n"); 912 /* read the status of the single shot comparators */ 913 for (i = 0; i < drvdata->nr_ss_cmp; i++) { 914 config->ss_status[i] = 915 etm4x_relaxed_read32(csa, TRCSSCSRn(i)); 916 } 917 918 /* read back the current counter values */ 919 for (i = 0; i < drvdata->nr_cntr; i++) { 920 config->cntr_val[i] = 921 etm4x_relaxed_read32(csa, TRCCNTVRn(i)); 922 } 923 924 coresight_disclaim_device_unlocked(csdev); 925 etm4_cs_lock(drvdata, csa); 926 927 dev_dbg(&drvdata->csdev->dev, 928 "cpu: %d disable smp call done\n", drvdata->cpu); 929 } 930 931 static int etm4_disable_perf(struct coresight_device *csdev, 932 struct perf_event *event) 933 { 934 u32 control; 935 struct etm_filters *filters = event->hw.addr_filters; 936 struct etmv4_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); 937 struct perf_event_attr *attr = &event->attr; 938 939 if (WARN_ON_ONCE(drvdata->cpu != smp_processor_id())) 940 return -EINVAL; 941 942 etm4_disable_hw(drvdata); 943 /* 944 * The config_id occupies bits 63:32 of the config2 perf event attr 945 * field. If this is non-zero then we will have enabled a config. 946 */ 947 if (attr->config2 & GENMASK_ULL(63, 32)) 948 cscfg_csdev_disable_active_config(csdev); 949 950 /* 951 * Check if the start/stop logic was active when the unit was stopped. 952 * That way we can re-enable the start/stop logic when the process is 953 * scheduled again. Configuration of the start/stop logic happens in 954 * function etm4_set_event_filters(). 955 */ 956 control = etm4x_relaxed_read32(&csdev->access, TRCVICTLR); 957 /* TRCVICTLR::SSSTATUS, bit[9] */ 958 filters->ssstatus = (control & BIT(9)); 959 960 /* 961 * perf will release trace ids when _free_aux() is 962 * called at the end of the session. 963 */ 964 965 return 0; 966 } 967 968 static void etm4_disable_sysfs(struct coresight_device *csdev) 969 { 970 struct etmv4_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); 971 972 /* 973 * Taking hotplug lock here protects from clocks getting disabled 974 * with tracing being left on (crash scenario) if user disable occurs 975 * after cpu online mask indicates the cpu is offline but before the 976 * DYING hotplug callback is serviced by the ETM driver. 977 */ 978 cpus_read_lock(); 979 spin_lock(&drvdata->spinlock); 980 981 /* 982 * Executing etm4_disable_hw on the cpu whose ETM is being disabled 983 * ensures that register writes occur when cpu is powered. 984 */ 985 smp_call_function_single(drvdata->cpu, etm4_disable_hw, drvdata, 1); 986 987 spin_unlock(&drvdata->spinlock); 988 cpus_read_unlock(); 989 990 /* 991 * we only release trace IDs when resetting sysfs. 992 * This permits sysfs users to read the trace ID after the trace 993 * session has completed. This maintains operational behaviour with 994 * prior trace id allocation method 995 */ 996 997 dev_dbg(&csdev->dev, "ETM tracing disabled\n"); 998 } 999 1000 static void etm4_disable(struct coresight_device *csdev, 1001 struct perf_event *event) 1002 { 1003 enum cs_mode mode; 1004 1005 /* 1006 * For as long as the tracer isn't disabled another entity can't 1007 * change its status. As such we can read the status here without 1008 * fearing it will change under us. 1009 */ 1010 mode = coresight_get_mode(csdev); 1011 1012 switch (mode) { 1013 case CS_MODE_DISABLED: 1014 break; 1015 case CS_MODE_SYSFS: 1016 etm4_disable_sysfs(csdev); 1017 break; 1018 case CS_MODE_PERF: 1019 etm4_disable_perf(csdev, event); 1020 break; 1021 } 1022 1023 if (mode) 1024 coresight_set_mode(csdev, CS_MODE_DISABLED); 1025 } 1026 1027 static const struct coresight_ops_source etm4_source_ops = { 1028 .cpu_id = etm4_cpu_id, 1029 .enable = etm4_enable, 1030 .disable = etm4_disable, 1031 }; 1032 1033 static const struct coresight_ops etm4_cs_ops = { 1034 .source_ops = &etm4_source_ops, 1035 }; 1036 1037 static inline bool cpu_supports_sysreg_trace(void) 1038 { 1039 u64 dfr0 = read_sysreg_s(SYS_ID_AA64DFR0_EL1); 1040 1041 return ((dfr0 >> ID_AA64DFR0_EL1_TraceVer_SHIFT) & 0xfUL) > 0; 1042 } 1043 1044 static bool etm4_init_sysreg_access(struct etmv4_drvdata *drvdata, 1045 struct csdev_access *csa) 1046 { 1047 u32 devarch; 1048 1049 if (!cpu_supports_sysreg_trace()) 1050 return false; 1051 1052 /* 1053 * ETMs implementing sysreg access must implement TRCDEVARCH. 1054 */ 1055 devarch = read_etm4x_sysreg_const_offset(TRCDEVARCH); 1056 switch (devarch & ETM_DEVARCH_ID_MASK) { 1057 case ETM_DEVARCH_ETMv4x_ARCH: 1058 *csa = (struct csdev_access) { 1059 .io_mem = false, 1060 .read = etm4x_sysreg_read, 1061 .write = etm4x_sysreg_write, 1062 }; 1063 break; 1064 case ETM_DEVARCH_ETE_ARCH: 1065 *csa = (struct csdev_access) { 1066 .io_mem = false, 1067 .read = ete_sysreg_read, 1068 .write = ete_sysreg_write, 1069 }; 1070 break; 1071 default: 1072 return false; 1073 } 1074 1075 drvdata->arch = etm_devarch_to_arch(devarch); 1076 return true; 1077 } 1078 1079 static bool is_devtype_cpu_trace(void __iomem *base) 1080 { 1081 u32 devtype = readl(base + TRCDEVTYPE); 1082 1083 return (devtype == CS_DEVTYPE_PE_TRACE); 1084 } 1085 1086 static bool etm4_init_iomem_access(struct etmv4_drvdata *drvdata, 1087 struct csdev_access *csa) 1088 { 1089 u32 devarch = readl_relaxed(drvdata->base + TRCDEVARCH); 1090 1091 if (!is_coresight_device(drvdata->base) || !is_devtype_cpu_trace(drvdata->base)) 1092 return false; 1093 1094 /* 1095 * All ETMs must implement TRCDEVARCH to indicate that 1096 * the component is an ETMv4. Even though TRCIDR1 also 1097 * contains the information, it is part of the "Trace" 1098 * register and must be accessed with the OSLK cleared, 1099 * with MMIO. But we cannot touch the OSLK until we are 1100 * sure this is an ETM. So rely only on the TRCDEVARCH. 1101 */ 1102 if ((devarch & ETM_DEVARCH_ID_MASK) != ETM_DEVARCH_ETMv4x_ARCH) { 1103 pr_warn_once("TRCDEVARCH doesn't match ETMv4 architecture\n"); 1104 return false; 1105 } 1106 1107 drvdata->arch = etm_devarch_to_arch(devarch); 1108 *csa = CSDEV_ACCESS_IOMEM(drvdata->base); 1109 return true; 1110 } 1111 1112 static bool etm4_init_csdev_access(struct etmv4_drvdata *drvdata, 1113 struct csdev_access *csa) 1114 { 1115 /* 1116 * Always choose the memory mapped io, if there is 1117 * a memory map to prevent sysreg access on broken 1118 * systems. 1119 */ 1120 if (drvdata->base) 1121 return etm4_init_iomem_access(drvdata, csa); 1122 1123 if (etm4_init_sysreg_access(drvdata, csa)) 1124 return true; 1125 1126 return false; 1127 } 1128 1129 static void cpu_detect_trace_filtering(struct etmv4_drvdata *drvdata) 1130 { 1131 u64 dfr0 = read_sysreg(id_aa64dfr0_el1); 1132 u64 trfcr; 1133 1134 drvdata->trfcr = 0; 1135 if (!cpuid_feature_extract_unsigned_field(dfr0, ID_AA64DFR0_EL1_TraceFilt_SHIFT)) 1136 return; 1137 1138 /* 1139 * If the CPU supports v8.4 SelfHosted Tracing, enable 1140 * tracing at the kernel EL and EL0, forcing to use the 1141 * virtual time as the timestamp. 1142 */ 1143 trfcr = (TRFCR_ELx_TS_VIRTUAL | 1144 TRFCR_ELx_ExTRE | 1145 TRFCR_ELx_E0TRE); 1146 1147 /* If we are running at EL2, allow tracing the CONTEXTIDR_EL2. */ 1148 if (is_kernel_in_hyp_mode()) 1149 trfcr |= TRFCR_EL2_CX; 1150 1151 drvdata->trfcr = trfcr; 1152 } 1153 1154 /* 1155 * The following errata on applicable cpu ranges, affect the CCITMIN filed 1156 * in TCRIDR3 register. Software read for the field returns 0x100 limiting 1157 * the cycle threshold granularity, whereas the right value should have 1158 * been 0x4, which is well supported in the hardware. 1159 */ 1160 static struct midr_range etm_wrong_ccitmin_cpus[] = { 1161 /* Erratum #1490853 - Cortex-A76 */ 1162 MIDR_RANGE(MIDR_CORTEX_A76, 0, 0, 4, 0), 1163 /* Erratum #1490853 - Neoverse-N1 */ 1164 MIDR_RANGE(MIDR_NEOVERSE_N1, 0, 0, 4, 0), 1165 /* Erratum #1491015 - Cortex-A77 */ 1166 MIDR_RANGE(MIDR_CORTEX_A77, 0, 0, 1, 0), 1167 /* Erratum #1502854 - Cortex-X1 */ 1168 MIDR_REV(MIDR_CORTEX_X1, 0, 0), 1169 /* Erratum #1619801 - Neoverse-V1 */ 1170 MIDR_REV(MIDR_NEOVERSE_V1, 0, 0), 1171 {}, 1172 }; 1173 1174 static void etm4_fixup_wrong_ccitmin(struct etmv4_drvdata *drvdata) 1175 { 1176 /* 1177 * Erratum affected cpus will read 256 as the minimum 1178 * instruction trace cycle counting threshold whereas 1179 * the correct value should be 4 instead. Override the 1180 * recorded value for 'drvdata->ccitmin' to workaround 1181 * this problem. 1182 */ 1183 if (is_midr_in_range_list(read_cpuid_id(), etm_wrong_ccitmin_cpus)) { 1184 if (drvdata->ccitmin == 256) 1185 drvdata->ccitmin = 4; 1186 } 1187 } 1188 1189 static void etm4_init_arch_data(void *info) 1190 { 1191 u32 etmidr0; 1192 u32 etmidr2; 1193 u32 etmidr3; 1194 u32 etmidr4; 1195 u32 etmidr5; 1196 struct etm4_init_arg *init_arg = info; 1197 struct etmv4_drvdata *drvdata; 1198 struct csdev_access *csa; 1199 struct device *dev = init_arg->dev; 1200 int i; 1201 1202 drvdata = dev_get_drvdata(init_arg->dev); 1203 csa = init_arg->csa; 1204 1205 /* 1206 * If we are unable to detect the access mechanism, 1207 * or unable to detect the trace unit type, fail 1208 * early. 1209 */ 1210 if (!etm4_init_csdev_access(drvdata, csa)) 1211 return; 1212 1213 if (!csa->io_mem || 1214 fwnode_property_present(dev_fwnode(dev), "qcom,skip-power-up")) 1215 drvdata->skip_power_up = true; 1216 1217 /* Detect the support for OS Lock before we actually use it */ 1218 etm_detect_os_lock(drvdata, csa); 1219 1220 /* Make sure all registers are accessible */ 1221 etm4_os_unlock_csa(drvdata, csa); 1222 etm4_cs_unlock(drvdata, csa); 1223 1224 etm4_check_arch_features(drvdata, csa); 1225 1226 /* find all capabilities of the tracing unit */ 1227 etmidr0 = etm4x_relaxed_read32(csa, TRCIDR0); 1228 1229 /* INSTP0, bits[2:1] P0 tracing support field */ 1230 drvdata->instrp0 = !!(FIELD_GET(TRCIDR0_INSTP0_MASK, etmidr0) == 0b11); 1231 /* TRCBB, bit[5] Branch broadcast tracing support bit */ 1232 drvdata->trcbb = !!(etmidr0 & TRCIDR0_TRCBB); 1233 /* TRCCOND, bit[6] Conditional instruction tracing support bit */ 1234 drvdata->trccond = !!(etmidr0 & TRCIDR0_TRCCOND); 1235 /* TRCCCI, bit[7] Cycle counting instruction bit */ 1236 drvdata->trccci = !!(etmidr0 & TRCIDR0_TRCCCI); 1237 /* RETSTACK, bit[9] Return stack bit */ 1238 drvdata->retstack = !!(etmidr0 & TRCIDR0_RETSTACK); 1239 /* NUMEVENT, bits[11:10] Number of events field */ 1240 drvdata->nr_event = FIELD_GET(TRCIDR0_NUMEVENT_MASK, etmidr0); 1241 /* QSUPP, bits[16:15] Q element support field */ 1242 drvdata->q_support = FIELD_GET(TRCIDR0_QSUPP_MASK, etmidr0); 1243 if (drvdata->q_support) 1244 drvdata->q_filt = !!(etmidr0 & TRCIDR0_QFILT); 1245 /* TSSIZE, bits[28:24] Global timestamp size field */ 1246 drvdata->ts_size = FIELD_GET(TRCIDR0_TSSIZE_MASK, etmidr0); 1247 1248 /* maximum size of resources */ 1249 etmidr2 = etm4x_relaxed_read32(csa, TRCIDR2); 1250 /* CIDSIZE, bits[9:5] Indicates the Context ID size */ 1251 drvdata->ctxid_size = FIELD_GET(TRCIDR2_CIDSIZE_MASK, etmidr2); 1252 /* VMIDSIZE, bits[14:10] Indicates the VMID size */ 1253 drvdata->vmid_size = FIELD_GET(TRCIDR2_VMIDSIZE_MASK, etmidr2); 1254 /* CCSIZE, bits[28:25] size of the cycle counter in bits minus 12 */ 1255 drvdata->ccsize = FIELD_GET(TRCIDR2_CCSIZE_MASK, etmidr2); 1256 1257 etmidr3 = etm4x_relaxed_read32(csa, TRCIDR3); 1258 /* CCITMIN, bits[11:0] minimum threshold value that can be programmed */ 1259 drvdata->ccitmin = FIELD_GET(TRCIDR3_CCITMIN_MASK, etmidr3); 1260 etm4_fixup_wrong_ccitmin(drvdata); 1261 1262 /* EXLEVEL_S, bits[19:16] Secure state instruction tracing */ 1263 drvdata->s_ex_level = FIELD_GET(TRCIDR3_EXLEVEL_S_MASK, etmidr3); 1264 drvdata->config.s_ex_level = drvdata->s_ex_level; 1265 /* EXLEVEL_NS, bits[23:20] Non-secure state instruction tracing */ 1266 drvdata->ns_ex_level = FIELD_GET(TRCIDR3_EXLEVEL_NS_MASK, etmidr3); 1267 /* 1268 * TRCERR, bit[24] whether a trace unit can trace a 1269 * system error exception. 1270 */ 1271 drvdata->trc_error = !!(etmidr3 & TRCIDR3_TRCERR); 1272 /* SYNCPR, bit[25] implementation has a fixed synchronization period? */ 1273 drvdata->syncpr = !!(etmidr3 & TRCIDR3_SYNCPR); 1274 /* STALLCTL, bit[26] is stall control implemented? */ 1275 drvdata->stallctl = !!(etmidr3 & TRCIDR3_STALLCTL); 1276 /* SYSSTALL, bit[27] implementation can support stall control? */ 1277 drvdata->sysstall = !!(etmidr3 & TRCIDR3_SYSSTALL); 1278 /* 1279 * NUMPROC - the number of PEs available for tracing, 5bits 1280 * = TRCIDR3.bits[13:12]bits[30:28] 1281 * bits[4:3] = TRCIDR3.bits[13:12] (since etm-v4.2, otherwise RES0) 1282 * bits[3:0] = TRCIDR3.bits[30:28] 1283 */ 1284 drvdata->nr_pe = (FIELD_GET(TRCIDR3_NUMPROC_HI_MASK, etmidr3) << 3) | 1285 FIELD_GET(TRCIDR3_NUMPROC_LO_MASK, etmidr3); 1286 /* NOOVERFLOW, bit[31] is trace overflow prevention supported */ 1287 drvdata->nooverflow = !!(etmidr3 & TRCIDR3_NOOVERFLOW); 1288 1289 /* number of resources trace unit supports */ 1290 etmidr4 = etm4x_relaxed_read32(csa, TRCIDR4); 1291 /* NUMACPAIRS, bits[0:3] number of addr comparator pairs for tracing */ 1292 drvdata->nr_addr_cmp = FIELD_GET(TRCIDR4_NUMACPAIRS_MASK, etmidr4); 1293 /* NUMPC, bits[15:12] number of PE comparator inputs for tracing */ 1294 drvdata->nr_pe_cmp = FIELD_GET(TRCIDR4_NUMPC_MASK, etmidr4); 1295 /* 1296 * NUMRSPAIR, bits[19:16] 1297 * The number of resource pairs conveyed by the HW starts at 0, i.e a 1298 * value of 0x0 indicate 1 resource pair, 0x1 indicate two and so on. 1299 * As such add 1 to the value of NUMRSPAIR for a better representation. 1300 * 1301 * For ETM v4.3 and later, 0x0 means 0, and no pairs are available - 1302 * the default TRUE and FALSE resource selectors are omitted. 1303 * Otherwise for values 0x1 and above the number is N + 1 as per v4.2. 1304 */ 1305 drvdata->nr_resource = FIELD_GET(TRCIDR4_NUMRSPAIR_MASK, etmidr4); 1306 if ((drvdata->arch < ETM_ARCH_V4_3) || (drvdata->nr_resource > 0)) 1307 drvdata->nr_resource += 1; 1308 /* 1309 * NUMSSCC, bits[23:20] the number of single-shot 1310 * comparator control for tracing. Read any status regs as these 1311 * also contain RO capability data. 1312 */ 1313 drvdata->nr_ss_cmp = FIELD_GET(TRCIDR4_NUMSSCC_MASK, etmidr4); 1314 for (i = 0; i < drvdata->nr_ss_cmp; i++) { 1315 drvdata->config.ss_status[i] = 1316 etm4x_relaxed_read32(csa, TRCSSCSRn(i)); 1317 } 1318 /* NUMCIDC, bits[27:24] number of Context ID comparators for tracing */ 1319 drvdata->numcidc = FIELD_GET(TRCIDR4_NUMCIDC_MASK, etmidr4); 1320 /* NUMVMIDC, bits[31:28] number of VMID comparators for tracing */ 1321 drvdata->numvmidc = FIELD_GET(TRCIDR4_NUMVMIDC_MASK, etmidr4); 1322 1323 etmidr5 = etm4x_relaxed_read32(csa, TRCIDR5); 1324 /* NUMEXTIN, bits[8:0] number of external inputs implemented */ 1325 drvdata->nr_ext_inp = FIELD_GET(TRCIDR5_NUMEXTIN_MASK, etmidr5); 1326 /* TRACEIDSIZE, bits[21:16] indicates the trace ID width */ 1327 drvdata->trcid_size = FIELD_GET(TRCIDR5_TRACEIDSIZE_MASK, etmidr5); 1328 /* ATBTRIG, bit[22] implementation can support ATB triggers? */ 1329 drvdata->atbtrig = !!(etmidr5 & TRCIDR5_ATBTRIG); 1330 /* 1331 * LPOVERRIDE, bit[23] implementation supports 1332 * low-power state override 1333 */ 1334 drvdata->lpoverride = (etmidr5 & TRCIDR5_LPOVERRIDE) && (!drvdata->skip_power_up); 1335 /* NUMSEQSTATE, bits[27:25] number of sequencer states implemented */ 1336 drvdata->nrseqstate = FIELD_GET(TRCIDR5_NUMSEQSTATE_MASK, etmidr5); 1337 /* NUMCNTR, bits[30:28] number of counters available for tracing */ 1338 drvdata->nr_cntr = FIELD_GET(TRCIDR5_NUMCNTR_MASK, etmidr5); 1339 etm4_cs_lock(drvdata, csa); 1340 cpu_detect_trace_filtering(drvdata); 1341 } 1342 1343 static inline u32 etm4_get_victlr_access_type(struct etmv4_config *config) 1344 { 1345 return etm4_get_access_type(config) << __bf_shf(TRCVICTLR_EXLEVEL_MASK); 1346 } 1347 1348 /* Set ELx trace filter access in the TRCVICTLR register */ 1349 static void etm4_set_victlr_access(struct etmv4_config *config) 1350 { 1351 config->vinst_ctrl &= ~TRCVICTLR_EXLEVEL_MASK; 1352 config->vinst_ctrl |= etm4_get_victlr_access_type(config); 1353 } 1354 1355 static void etm4_set_default_config(struct etmv4_config *config) 1356 { 1357 /* disable all events tracing */ 1358 config->eventctrl0 = 0x0; 1359 config->eventctrl1 = 0x0; 1360 1361 /* disable stalling */ 1362 config->stall_ctrl = 0x0; 1363 1364 /* enable trace synchronization every 4096 bytes, if available */ 1365 config->syncfreq = 0xC; 1366 1367 /* disable timestamp event */ 1368 config->ts_ctrl = 0x0; 1369 1370 /* TRCVICTLR::EVENT = 0x01, select the always on logic */ 1371 config->vinst_ctrl = FIELD_PREP(TRCVICTLR_EVENT_MASK, 0x01); 1372 1373 /* TRCVICTLR::EXLEVEL_NS:EXLEVELS: Set kernel / user filtering */ 1374 etm4_set_victlr_access(config); 1375 } 1376 1377 static u64 etm4_get_ns_access_type(struct etmv4_config *config) 1378 { 1379 u64 access_type = 0; 1380 1381 /* 1382 * EXLEVEL_NS, for NonSecure Exception levels. 1383 * The mask here is a generic value and must be 1384 * shifted to the corresponding field for the registers 1385 */ 1386 if (!is_kernel_in_hyp_mode()) { 1387 /* Stay away from hypervisor mode for non-VHE */ 1388 access_type = ETM_EXLEVEL_NS_HYP; 1389 if (config->mode & ETM_MODE_EXCL_KERN) 1390 access_type |= ETM_EXLEVEL_NS_OS; 1391 } else if (config->mode & ETM_MODE_EXCL_KERN) { 1392 access_type = ETM_EXLEVEL_NS_HYP; 1393 } 1394 1395 if (config->mode & ETM_MODE_EXCL_USER) 1396 access_type |= ETM_EXLEVEL_NS_APP; 1397 1398 return access_type; 1399 } 1400 1401 /* 1402 * Construct the exception level masks for a given config. 1403 * This must be shifted to the corresponding register field 1404 * for usage. 1405 */ 1406 static u64 etm4_get_access_type(struct etmv4_config *config) 1407 { 1408 /* All Secure exception levels are excluded from the trace */ 1409 return etm4_get_ns_access_type(config) | (u64)config->s_ex_level; 1410 } 1411 1412 static u64 etm4_get_comparator_access_type(struct etmv4_config *config) 1413 { 1414 return etm4_get_access_type(config) << TRCACATR_EXLEVEL_SHIFT; 1415 } 1416 1417 static void etm4_set_comparator_filter(struct etmv4_config *config, 1418 u64 start, u64 stop, int comparator) 1419 { 1420 u64 access_type = etm4_get_comparator_access_type(config); 1421 1422 /* First half of default address comparator */ 1423 config->addr_val[comparator] = start; 1424 config->addr_acc[comparator] = access_type; 1425 config->addr_type[comparator] = ETM_ADDR_TYPE_RANGE; 1426 1427 /* Second half of default address comparator */ 1428 config->addr_val[comparator + 1] = stop; 1429 config->addr_acc[comparator + 1] = access_type; 1430 config->addr_type[comparator + 1] = ETM_ADDR_TYPE_RANGE; 1431 1432 /* 1433 * Configure the ViewInst function to include this address range 1434 * comparator. 1435 * 1436 * @comparator is divided by two since it is the index in the 1437 * etmv4_config::addr_val array but register TRCVIIECTLR deals with 1438 * address range comparator _pairs_. 1439 * 1440 * Therefore: 1441 * index 0 -> compatator pair 0 1442 * index 2 -> comparator pair 1 1443 * index 4 -> comparator pair 2 1444 * ... 1445 * index 14 -> comparator pair 7 1446 */ 1447 config->viiectlr |= BIT(comparator / 2); 1448 } 1449 1450 static void etm4_set_start_stop_filter(struct etmv4_config *config, 1451 u64 address, int comparator, 1452 enum etm_addr_type type) 1453 { 1454 int shift; 1455 u64 access_type = etm4_get_comparator_access_type(config); 1456 1457 /* Configure the comparator */ 1458 config->addr_val[comparator] = address; 1459 config->addr_acc[comparator] = access_type; 1460 config->addr_type[comparator] = type; 1461 1462 /* 1463 * Configure ViewInst Start-Stop control register. 1464 * Addresses configured to start tracing go from bit 0 to n-1, 1465 * while those configured to stop tracing from 16 to 16 + n-1. 1466 */ 1467 shift = (type == ETM_ADDR_TYPE_START ? 0 : 16); 1468 config->vissctlr |= BIT(shift + comparator); 1469 } 1470 1471 static void etm4_set_default_filter(struct etmv4_config *config) 1472 { 1473 /* Trace everything 'default' filter achieved by no filtering */ 1474 config->viiectlr = 0x0; 1475 1476 /* 1477 * TRCVICTLR::SSSTATUS == 1, the start-stop logic is 1478 * in the started state 1479 */ 1480 config->vinst_ctrl |= TRCVICTLR_SSSTATUS; 1481 config->mode |= ETM_MODE_VIEWINST_STARTSTOP; 1482 1483 /* No start-stop filtering for ViewInst */ 1484 config->vissctlr = 0x0; 1485 } 1486 1487 static void etm4_set_default(struct etmv4_config *config) 1488 { 1489 if (WARN_ON_ONCE(!config)) 1490 return; 1491 1492 /* 1493 * Make default initialisation trace everything 1494 * 1495 * This is done by a minimum default config sufficient to enable 1496 * full instruction trace - with a default filter for trace all 1497 * achieved by having no filtering. 1498 */ 1499 etm4_set_default_config(config); 1500 etm4_set_default_filter(config); 1501 } 1502 1503 static int etm4_get_next_comparator(struct etmv4_drvdata *drvdata, u32 type) 1504 { 1505 int nr_comparator, index = 0; 1506 struct etmv4_config *config = &drvdata->config; 1507 1508 /* 1509 * nr_addr_cmp holds the number of comparator _pair_, so time 2 1510 * for the total number of comparators. 1511 */ 1512 nr_comparator = drvdata->nr_addr_cmp * 2; 1513 1514 /* Go through the tally of comparators looking for a free one. */ 1515 while (index < nr_comparator) { 1516 switch (type) { 1517 case ETM_ADDR_TYPE_RANGE: 1518 if (config->addr_type[index] == ETM_ADDR_TYPE_NONE && 1519 config->addr_type[index + 1] == ETM_ADDR_TYPE_NONE) 1520 return index; 1521 1522 /* Address range comparators go in pairs */ 1523 index += 2; 1524 break; 1525 case ETM_ADDR_TYPE_START: 1526 case ETM_ADDR_TYPE_STOP: 1527 if (config->addr_type[index] == ETM_ADDR_TYPE_NONE) 1528 return index; 1529 1530 /* Start/stop address can have odd indexes */ 1531 index += 1; 1532 break; 1533 default: 1534 return -EINVAL; 1535 } 1536 } 1537 1538 /* If we are here all the comparators have been used. */ 1539 return -ENOSPC; 1540 } 1541 1542 static int etm4_set_event_filters(struct etmv4_drvdata *drvdata, 1543 struct perf_event *event) 1544 { 1545 int i, comparator, ret = 0; 1546 u64 address; 1547 struct etmv4_config *config = &drvdata->config; 1548 struct etm_filters *filters = event->hw.addr_filters; 1549 1550 if (!filters) 1551 goto default_filter; 1552 1553 /* Sync events with what Perf got */ 1554 perf_event_addr_filters_sync(event); 1555 1556 /* 1557 * If there are no filters to deal with simply go ahead with 1558 * the default filter, i.e the entire address range. 1559 */ 1560 if (!filters->nr_filters) 1561 goto default_filter; 1562 1563 for (i = 0; i < filters->nr_filters; i++) { 1564 struct etm_filter *filter = &filters->etm_filter[i]; 1565 enum etm_addr_type type = filter->type; 1566 1567 /* See if a comparator is free. */ 1568 comparator = etm4_get_next_comparator(drvdata, type); 1569 if (comparator < 0) { 1570 ret = comparator; 1571 goto out; 1572 } 1573 1574 switch (type) { 1575 case ETM_ADDR_TYPE_RANGE: 1576 etm4_set_comparator_filter(config, 1577 filter->start_addr, 1578 filter->stop_addr, 1579 comparator); 1580 /* 1581 * TRCVICTLR::SSSTATUS == 1, the start-stop logic is 1582 * in the started state 1583 */ 1584 config->vinst_ctrl |= TRCVICTLR_SSSTATUS; 1585 1586 /* No start-stop filtering for ViewInst */ 1587 config->vissctlr = 0x0; 1588 break; 1589 case ETM_ADDR_TYPE_START: 1590 case ETM_ADDR_TYPE_STOP: 1591 /* Get the right start or stop address */ 1592 address = (type == ETM_ADDR_TYPE_START ? 1593 filter->start_addr : 1594 filter->stop_addr); 1595 1596 /* Configure comparator */ 1597 etm4_set_start_stop_filter(config, address, 1598 comparator, type); 1599 1600 /* 1601 * If filters::ssstatus == 1, trace acquisition was 1602 * started but the process was yanked away before the 1603 * stop address was hit. As such the start/stop 1604 * logic needs to be re-started so that tracing can 1605 * resume where it left. 1606 * 1607 * The start/stop logic status when a process is 1608 * scheduled out is checked in function 1609 * etm4_disable_perf(). 1610 */ 1611 if (filters->ssstatus) 1612 config->vinst_ctrl |= TRCVICTLR_SSSTATUS; 1613 1614 /* No include/exclude filtering for ViewInst */ 1615 config->viiectlr = 0x0; 1616 break; 1617 default: 1618 ret = -EINVAL; 1619 goto out; 1620 } 1621 } 1622 1623 goto out; 1624 1625 1626 default_filter: 1627 etm4_set_default_filter(config); 1628 1629 out: 1630 return ret; 1631 } 1632 1633 void etm4_config_trace_mode(struct etmv4_config *config) 1634 { 1635 u32 mode; 1636 1637 mode = config->mode; 1638 mode &= (ETM_MODE_EXCL_KERN | ETM_MODE_EXCL_USER); 1639 1640 /* excluding kernel AND user space doesn't make sense */ 1641 WARN_ON_ONCE(mode == (ETM_MODE_EXCL_KERN | ETM_MODE_EXCL_USER)); 1642 1643 /* nothing to do if neither flags are set */ 1644 if (!(mode & ETM_MODE_EXCL_KERN) && !(mode & ETM_MODE_EXCL_USER)) 1645 return; 1646 1647 etm4_set_victlr_access(config); 1648 } 1649 1650 static int etm4_online_cpu(unsigned int cpu) 1651 { 1652 if (!etmdrvdata[cpu]) 1653 return etm4_probe_cpu(cpu); 1654 1655 if (etmdrvdata[cpu]->boot_enable && !etmdrvdata[cpu]->sticky_enable) 1656 coresight_enable_sysfs(etmdrvdata[cpu]->csdev); 1657 return 0; 1658 } 1659 1660 static int etm4_starting_cpu(unsigned int cpu) 1661 { 1662 if (!etmdrvdata[cpu]) 1663 return 0; 1664 1665 spin_lock(&etmdrvdata[cpu]->spinlock); 1666 if (!etmdrvdata[cpu]->os_unlock) 1667 etm4_os_unlock(etmdrvdata[cpu]); 1668 1669 if (coresight_get_mode(etmdrvdata[cpu]->csdev)) 1670 etm4_enable_hw(etmdrvdata[cpu]); 1671 spin_unlock(&etmdrvdata[cpu]->spinlock); 1672 return 0; 1673 } 1674 1675 static int etm4_dying_cpu(unsigned int cpu) 1676 { 1677 if (!etmdrvdata[cpu]) 1678 return 0; 1679 1680 spin_lock(&etmdrvdata[cpu]->spinlock); 1681 if (coresight_get_mode(etmdrvdata[cpu]->csdev)) 1682 etm4_disable_hw(etmdrvdata[cpu]); 1683 spin_unlock(&etmdrvdata[cpu]->spinlock); 1684 return 0; 1685 } 1686 1687 static int __etm4_cpu_save(struct etmv4_drvdata *drvdata) 1688 { 1689 int i, ret = 0; 1690 struct etmv4_save_state *state; 1691 struct coresight_device *csdev = drvdata->csdev; 1692 struct csdev_access *csa; 1693 struct device *etm_dev; 1694 1695 if (WARN_ON(!csdev)) 1696 return -ENODEV; 1697 1698 etm_dev = &csdev->dev; 1699 csa = &csdev->access; 1700 1701 /* 1702 * As recommended by 3.4.1 ("The procedure when powering down the PE") 1703 * of ARM IHI 0064D 1704 */ 1705 dsb(sy); 1706 isb(); 1707 1708 etm4_cs_unlock(drvdata, csa); 1709 /* Lock the OS lock to disable trace and external debugger access */ 1710 etm4_os_lock(drvdata); 1711 1712 /* wait for TRCSTATR.PMSTABLE to go up */ 1713 if (coresight_timeout(csa, TRCSTATR, TRCSTATR_PMSTABLE_BIT, 1)) { 1714 dev_err(etm_dev, 1715 "timeout while waiting for PM Stable Status\n"); 1716 etm4_os_unlock(drvdata); 1717 ret = -EBUSY; 1718 goto out; 1719 } 1720 1721 state = drvdata->save_state; 1722 1723 state->trcprgctlr = etm4x_read32(csa, TRCPRGCTLR); 1724 if (drvdata->nr_pe) 1725 state->trcprocselr = etm4x_read32(csa, TRCPROCSELR); 1726 state->trcconfigr = etm4x_read32(csa, TRCCONFIGR); 1727 state->trcauxctlr = etm4x_read32(csa, TRCAUXCTLR); 1728 state->trceventctl0r = etm4x_read32(csa, TRCEVENTCTL0R); 1729 state->trceventctl1r = etm4x_read32(csa, TRCEVENTCTL1R); 1730 if (drvdata->stallctl) 1731 state->trcstallctlr = etm4x_read32(csa, TRCSTALLCTLR); 1732 state->trctsctlr = etm4x_read32(csa, TRCTSCTLR); 1733 state->trcsyncpr = etm4x_read32(csa, TRCSYNCPR); 1734 state->trcccctlr = etm4x_read32(csa, TRCCCCTLR); 1735 state->trcbbctlr = etm4x_read32(csa, TRCBBCTLR); 1736 state->trctraceidr = etm4x_read32(csa, TRCTRACEIDR); 1737 if (drvdata->q_filt) 1738 state->trcqctlr = etm4x_read32(csa, TRCQCTLR); 1739 1740 state->trcvictlr = etm4x_read32(csa, TRCVICTLR); 1741 state->trcviiectlr = etm4x_read32(csa, TRCVIIECTLR); 1742 state->trcvissctlr = etm4x_read32(csa, TRCVISSCTLR); 1743 if (drvdata->nr_pe_cmp) 1744 state->trcvipcssctlr = etm4x_read32(csa, TRCVIPCSSCTLR); 1745 1746 for (i = 0; i < drvdata->nrseqstate - 1; i++) 1747 state->trcseqevr[i] = etm4x_read32(csa, TRCSEQEVRn(i)); 1748 1749 if (drvdata->nrseqstate) { 1750 state->trcseqrstevr = etm4x_read32(csa, TRCSEQRSTEVR); 1751 state->trcseqstr = etm4x_read32(csa, TRCSEQSTR); 1752 } 1753 state->trcextinselr = etm4x_read32(csa, TRCEXTINSELR); 1754 1755 for (i = 0; i < drvdata->nr_cntr; i++) { 1756 state->trccntrldvr[i] = etm4x_read32(csa, TRCCNTRLDVRn(i)); 1757 state->trccntctlr[i] = etm4x_read32(csa, TRCCNTCTLRn(i)); 1758 state->trccntvr[i] = etm4x_read32(csa, TRCCNTVRn(i)); 1759 } 1760 1761 /* Resource selector pair 0 is reserved */ 1762 for (i = 2; i < drvdata->nr_resource * 2; i++) 1763 state->trcrsctlr[i] = etm4x_read32(csa, TRCRSCTLRn(i)); 1764 1765 for (i = 0; i < drvdata->nr_ss_cmp; i++) { 1766 state->trcssccr[i] = etm4x_read32(csa, TRCSSCCRn(i)); 1767 state->trcsscsr[i] = etm4x_read32(csa, TRCSSCSRn(i)); 1768 if (etm4x_sspcicrn_present(drvdata, i)) 1769 state->trcsspcicr[i] = etm4x_read32(csa, TRCSSPCICRn(i)); 1770 } 1771 1772 for (i = 0; i < drvdata->nr_addr_cmp * 2; i++) { 1773 state->trcacvr[i] = etm4x_read64(csa, TRCACVRn(i)); 1774 state->trcacatr[i] = etm4x_read64(csa, TRCACATRn(i)); 1775 } 1776 1777 /* 1778 * Data trace stream is architecturally prohibited for A profile cores 1779 * so we don't save (or later restore) trcdvcvr and trcdvcmr - As per 1780 * section 1.3.4 ("Possible functional configurations of an ETMv4 trace 1781 * unit") of ARM IHI 0064D. 1782 */ 1783 1784 for (i = 0; i < drvdata->numcidc; i++) 1785 state->trccidcvr[i] = etm4x_read64(csa, TRCCIDCVRn(i)); 1786 1787 for (i = 0; i < drvdata->numvmidc; i++) 1788 state->trcvmidcvr[i] = etm4x_read64(csa, TRCVMIDCVRn(i)); 1789 1790 state->trccidcctlr0 = etm4x_read32(csa, TRCCIDCCTLR0); 1791 if (drvdata->numcidc > 4) 1792 state->trccidcctlr1 = etm4x_read32(csa, TRCCIDCCTLR1); 1793 1794 state->trcvmidcctlr0 = etm4x_read32(csa, TRCVMIDCCTLR0); 1795 if (drvdata->numvmidc > 4) 1796 state->trcvmidcctlr0 = etm4x_read32(csa, TRCVMIDCCTLR1); 1797 1798 state->trcclaimset = etm4x_read32(csa, TRCCLAIMCLR); 1799 1800 if (!drvdata->skip_power_up) 1801 state->trcpdcr = etm4x_read32(csa, TRCPDCR); 1802 1803 /* wait for TRCSTATR.IDLE to go up */ 1804 if (coresight_timeout(csa, TRCSTATR, TRCSTATR_IDLE_BIT, 1)) { 1805 dev_err(etm_dev, 1806 "timeout while waiting for Idle Trace Status\n"); 1807 etm4_os_unlock(drvdata); 1808 ret = -EBUSY; 1809 goto out; 1810 } 1811 1812 drvdata->state_needs_restore = true; 1813 1814 /* 1815 * Power can be removed from the trace unit now. We do this to 1816 * potentially save power on systems that respect the TRCPDCR_PU 1817 * despite requesting software to save/restore state. 1818 */ 1819 if (!drvdata->skip_power_up) 1820 etm4x_relaxed_write32(csa, (state->trcpdcr & ~TRCPDCR_PU), 1821 TRCPDCR); 1822 out: 1823 etm4_cs_lock(drvdata, csa); 1824 return ret; 1825 } 1826 1827 static int etm4_cpu_save(struct etmv4_drvdata *drvdata) 1828 { 1829 int ret = 0; 1830 1831 /* Save the TRFCR irrespective of whether the ETM is ON */ 1832 if (drvdata->trfcr) 1833 drvdata->save_trfcr = read_trfcr(); 1834 /* 1835 * Save and restore the ETM Trace registers only if 1836 * the ETM is active. 1837 */ 1838 if (coresight_get_mode(drvdata->csdev) && drvdata->save_state) 1839 ret = __etm4_cpu_save(drvdata); 1840 return ret; 1841 } 1842 1843 static void __etm4_cpu_restore(struct etmv4_drvdata *drvdata) 1844 { 1845 int i; 1846 struct etmv4_save_state *state = drvdata->save_state; 1847 struct csdev_access *csa = &drvdata->csdev->access; 1848 1849 if (WARN_ON(!drvdata->csdev)) 1850 return; 1851 1852 etm4_cs_unlock(drvdata, csa); 1853 etm4x_relaxed_write32(csa, state->trcclaimset, TRCCLAIMSET); 1854 1855 etm4x_relaxed_write32(csa, state->trcprgctlr, TRCPRGCTLR); 1856 if (drvdata->nr_pe) 1857 etm4x_relaxed_write32(csa, state->trcprocselr, TRCPROCSELR); 1858 etm4x_relaxed_write32(csa, state->trcconfigr, TRCCONFIGR); 1859 etm4x_relaxed_write32(csa, state->trcauxctlr, TRCAUXCTLR); 1860 etm4x_relaxed_write32(csa, state->trceventctl0r, TRCEVENTCTL0R); 1861 etm4x_relaxed_write32(csa, state->trceventctl1r, TRCEVENTCTL1R); 1862 if (drvdata->stallctl) 1863 etm4x_relaxed_write32(csa, state->trcstallctlr, TRCSTALLCTLR); 1864 etm4x_relaxed_write32(csa, state->trctsctlr, TRCTSCTLR); 1865 etm4x_relaxed_write32(csa, state->trcsyncpr, TRCSYNCPR); 1866 etm4x_relaxed_write32(csa, state->trcccctlr, TRCCCCTLR); 1867 etm4x_relaxed_write32(csa, state->trcbbctlr, TRCBBCTLR); 1868 etm4x_relaxed_write32(csa, state->trctraceidr, TRCTRACEIDR); 1869 if (drvdata->q_filt) 1870 etm4x_relaxed_write32(csa, state->trcqctlr, TRCQCTLR); 1871 1872 etm4x_relaxed_write32(csa, state->trcvictlr, TRCVICTLR); 1873 etm4x_relaxed_write32(csa, state->trcviiectlr, TRCVIIECTLR); 1874 etm4x_relaxed_write32(csa, state->trcvissctlr, TRCVISSCTLR); 1875 if (drvdata->nr_pe_cmp) 1876 etm4x_relaxed_write32(csa, state->trcvipcssctlr, TRCVIPCSSCTLR); 1877 1878 for (i = 0; i < drvdata->nrseqstate - 1; i++) 1879 etm4x_relaxed_write32(csa, state->trcseqevr[i], TRCSEQEVRn(i)); 1880 1881 if (drvdata->nrseqstate) { 1882 etm4x_relaxed_write32(csa, state->trcseqrstevr, TRCSEQRSTEVR); 1883 etm4x_relaxed_write32(csa, state->trcseqstr, TRCSEQSTR); 1884 } 1885 etm4x_relaxed_write32(csa, state->trcextinselr, TRCEXTINSELR); 1886 1887 for (i = 0; i < drvdata->nr_cntr; i++) { 1888 etm4x_relaxed_write32(csa, state->trccntrldvr[i], TRCCNTRLDVRn(i)); 1889 etm4x_relaxed_write32(csa, state->trccntctlr[i], TRCCNTCTLRn(i)); 1890 etm4x_relaxed_write32(csa, state->trccntvr[i], TRCCNTVRn(i)); 1891 } 1892 1893 /* Resource selector pair 0 is reserved */ 1894 for (i = 2; i < drvdata->nr_resource * 2; i++) 1895 etm4x_relaxed_write32(csa, state->trcrsctlr[i], TRCRSCTLRn(i)); 1896 1897 for (i = 0; i < drvdata->nr_ss_cmp; i++) { 1898 etm4x_relaxed_write32(csa, state->trcssccr[i], TRCSSCCRn(i)); 1899 etm4x_relaxed_write32(csa, state->trcsscsr[i], TRCSSCSRn(i)); 1900 if (etm4x_sspcicrn_present(drvdata, i)) 1901 etm4x_relaxed_write32(csa, state->trcsspcicr[i], TRCSSPCICRn(i)); 1902 } 1903 1904 for (i = 0; i < drvdata->nr_addr_cmp * 2; i++) { 1905 etm4x_relaxed_write64(csa, state->trcacvr[i], TRCACVRn(i)); 1906 etm4x_relaxed_write64(csa, state->trcacatr[i], TRCACATRn(i)); 1907 } 1908 1909 for (i = 0; i < drvdata->numcidc; i++) 1910 etm4x_relaxed_write64(csa, state->trccidcvr[i], TRCCIDCVRn(i)); 1911 1912 for (i = 0; i < drvdata->numvmidc; i++) 1913 etm4x_relaxed_write64(csa, state->trcvmidcvr[i], TRCVMIDCVRn(i)); 1914 1915 etm4x_relaxed_write32(csa, state->trccidcctlr0, TRCCIDCCTLR0); 1916 if (drvdata->numcidc > 4) 1917 etm4x_relaxed_write32(csa, state->trccidcctlr1, TRCCIDCCTLR1); 1918 1919 etm4x_relaxed_write32(csa, state->trcvmidcctlr0, TRCVMIDCCTLR0); 1920 if (drvdata->numvmidc > 4) 1921 etm4x_relaxed_write32(csa, state->trcvmidcctlr0, TRCVMIDCCTLR1); 1922 1923 etm4x_relaxed_write32(csa, state->trcclaimset, TRCCLAIMSET); 1924 1925 if (!drvdata->skip_power_up) 1926 etm4x_relaxed_write32(csa, state->trcpdcr, TRCPDCR); 1927 1928 drvdata->state_needs_restore = false; 1929 1930 /* 1931 * As recommended by section 4.3.7 ("Synchronization when using the 1932 * memory-mapped interface") of ARM IHI 0064D 1933 */ 1934 dsb(sy); 1935 isb(); 1936 1937 /* Unlock the OS lock to re-enable trace and external debug access */ 1938 etm4_os_unlock(drvdata); 1939 etm4_cs_lock(drvdata, csa); 1940 } 1941 1942 static void etm4_cpu_restore(struct etmv4_drvdata *drvdata) 1943 { 1944 if (drvdata->trfcr) 1945 write_trfcr(drvdata->save_trfcr); 1946 if (drvdata->state_needs_restore) 1947 __etm4_cpu_restore(drvdata); 1948 } 1949 1950 static int etm4_cpu_pm_notify(struct notifier_block *nb, unsigned long cmd, 1951 void *v) 1952 { 1953 struct etmv4_drvdata *drvdata; 1954 unsigned int cpu = smp_processor_id(); 1955 1956 if (!etmdrvdata[cpu]) 1957 return NOTIFY_OK; 1958 1959 drvdata = etmdrvdata[cpu]; 1960 1961 if (WARN_ON_ONCE(drvdata->cpu != cpu)) 1962 return NOTIFY_BAD; 1963 1964 switch (cmd) { 1965 case CPU_PM_ENTER: 1966 if (etm4_cpu_save(drvdata)) 1967 return NOTIFY_BAD; 1968 break; 1969 case CPU_PM_EXIT: 1970 case CPU_PM_ENTER_FAILED: 1971 etm4_cpu_restore(drvdata); 1972 break; 1973 default: 1974 return NOTIFY_DONE; 1975 } 1976 1977 return NOTIFY_OK; 1978 } 1979 1980 static struct notifier_block etm4_cpu_pm_nb = { 1981 .notifier_call = etm4_cpu_pm_notify, 1982 }; 1983 1984 /* Setup PM. Deals with error conditions and counts */ 1985 static int __init etm4_pm_setup(void) 1986 { 1987 int ret; 1988 1989 ret = cpu_pm_register_notifier(&etm4_cpu_pm_nb); 1990 if (ret) 1991 return ret; 1992 1993 ret = cpuhp_setup_state_nocalls(CPUHP_AP_ARM_CORESIGHT_STARTING, 1994 "arm/coresight4:starting", 1995 etm4_starting_cpu, etm4_dying_cpu); 1996 1997 if (ret) 1998 goto unregister_notifier; 1999 2000 ret = cpuhp_setup_state_nocalls(CPUHP_AP_ONLINE_DYN, 2001 "arm/coresight4:online", 2002 etm4_online_cpu, NULL); 2003 2004 /* HP dyn state ID returned in ret on success */ 2005 if (ret > 0) { 2006 hp_online = ret; 2007 return 0; 2008 } 2009 2010 /* failed dyn state - remove others */ 2011 cpuhp_remove_state_nocalls(CPUHP_AP_ARM_CORESIGHT_STARTING); 2012 2013 unregister_notifier: 2014 cpu_pm_unregister_notifier(&etm4_cpu_pm_nb); 2015 return ret; 2016 } 2017 2018 static void etm4_pm_clear(void) 2019 { 2020 cpu_pm_unregister_notifier(&etm4_cpu_pm_nb); 2021 cpuhp_remove_state_nocalls(CPUHP_AP_ARM_CORESIGHT_STARTING); 2022 if (hp_online) { 2023 cpuhp_remove_state_nocalls(hp_online); 2024 hp_online = 0; 2025 } 2026 } 2027 2028 static int etm4_add_coresight_dev(struct etm4_init_arg *init_arg) 2029 { 2030 int ret; 2031 struct coresight_platform_data *pdata = NULL; 2032 struct device *dev = init_arg->dev; 2033 struct etmv4_drvdata *drvdata = dev_get_drvdata(dev); 2034 struct coresight_desc desc = { 0 }; 2035 u8 major, minor; 2036 char *type_name; 2037 2038 if (!drvdata) 2039 return -EINVAL; 2040 2041 desc.access = *init_arg->csa; 2042 2043 if (!drvdata->arch) 2044 return -EINVAL; 2045 2046 major = ETM_ARCH_MAJOR_VERSION(drvdata->arch); 2047 minor = ETM_ARCH_MINOR_VERSION(drvdata->arch); 2048 2049 if (etm4x_is_ete(drvdata)) { 2050 type_name = "ete"; 2051 /* ETE v1 has major version == 0b101. Adjust this for logging.*/ 2052 major -= 4; 2053 } else { 2054 type_name = "etm"; 2055 } 2056 2057 desc.name = devm_kasprintf(dev, GFP_KERNEL, 2058 "%s%d", type_name, drvdata->cpu); 2059 if (!desc.name) 2060 return -ENOMEM; 2061 2062 etm4_set_default(&drvdata->config); 2063 2064 pdata = coresight_get_platform_data(dev); 2065 if (IS_ERR(pdata)) 2066 return PTR_ERR(pdata); 2067 2068 dev->platform_data = pdata; 2069 2070 desc.type = CORESIGHT_DEV_TYPE_SOURCE; 2071 desc.subtype.source_subtype = CORESIGHT_DEV_SUBTYPE_SOURCE_PROC; 2072 desc.ops = &etm4_cs_ops; 2073 desc.pdata = pdata; 2074 desc.dev = dev; 2075 desc.groups = coresight_etmv4_groups; 2076 drvdata->csdev = coresight_register(&desc); 2077 if (IS_ERR(drvdata->csdev)) 2078 return PTR_ERR(drvdata->csdev); 2079 2080 ret = etm_perf_symlink(drvdata->csdev, true); 2081 if (ret) { 2082 coresight_unregister(drvdata->csdev); 2083 return ret; 2084 } 2085 2086 /* register with config infrastructure & load any current features */ 2087 ret = etm4_cscfg_register(drvdata->csdev); 2088 if (ret) { 2089 coresight_unregister(drvdata->csdev); 2090 return ret; 2091 } 2092 2093 etmdrvdata[drvdata->cpu] = drvdata; 2094 2095 dev_info(&drvdata->csdev->dev, "CPU%d: %s v%d.%d initialized\n", 2096 drvdata->cpu, type_name, major, minor); 2097 2098 if (boot_enable) { 2099 coresight_enable_sysfs(drvdata->csdev); 2100 drvdata->boot_enable = true; 2101 } 2102 2103 return 0; 2104 } 2105 2106 static int etm4_probe(struct device *dev) 2107 { 2108 struct etmv4_drvdata *drvdata = dev_get_drvdata(dev); 2109 struct csdev_access access = { 0 }; 2110 struct etm4_init_arg init_arg = { 0 }; 2111 struct etm4_init_arg *delayed; 2112 2113 if (WARN_ON(!drvdata)) 2114 return -ENOMEM; 2115 2116 if (pm_save_enable == PARAM_PM_SAVE_FIRMWARE) 2117 pm_save_enable = coresight_loses_context_with_cpu(dev) ? 2118 PARAM_PM_SAVE_SELF_HOSTED : PARAM_PM_SAVE_NEVER; 2119 2120 if (pm_save_enable != PARAM_PM_SAVE_NEVER) { 2121 drvdata->save_state = devm_kmalloc(dev, 2122 sizeof(struct etmv4_save_state), GFP_KERNEL); 2123 if (!drvdata->save_state) 2124 return -ENOMEM; 2125 } 2126 2127 spin_lock_init(&drvdata->spinlock); 2128 2129 drvdata->cpu = coresight_get_cpu(dev); 2130 if (drvdata->cpu < 0) 2131 return drvdata->cpu; 2132 2133 init_arg.dev = dev; 2134 init_arg.csa = &access; 2135 2136 /* 2137 * Serialize against CPUHP callbacks to avoid race condition 2138 * between the smp call and saving the delayed probe. 2139 */ 2140 cpus_read_lock(); 2141 if (smp_call_function_single(drvdata->cpu, 2142 etm4_init_arch_data, &init_arg, 1)) { 2143 /* The CPU was offline, try again once it comes online. */ 2144 delayed = devm_kmalloc(dev, sizeof(*delayed), GFP_KERNEL); 2145 if (!delayed) { 2146 cpus_read_unlock(); 2147 return -ENOMEM; 2148 } 2149 2150 *delayed = init_arg; 2151 2152 per_cpu(delayed_probe, drvdata->cpu) = delayed; 2153 2154 cpus_read_unlock(); 2155 return 0; 2156 } 2157 cpus_read_unlock(); 2158 2159 return etm4_add_coresight_dev(&init_arg); 2160 } 2161 2162 static int etm4_probe_amba(struct amba_device *adev, const struct amba_id *id) 2163 { 2164 struct etmv4_drvdata *drvdata; 2165 void __iomem *base; 2166 struct device *dev = &adev->dev; 2167 struct resource *res = &adev->res; 2168 int ret; 2169 2170 /* Validity for the resource is already checked by the AMBA core */ 2171 base = devm_ioremap_resource(dev, res); 2172 if (IS_ERR(base)) 2173 return PTR_ERR(base); 2174 2175 drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL); 2176 if (!drvdata) 2177 return -ENOMEM; 2178 2179 drvdata->base = base; 2180 dev_set_drvdata(dev, drvdata); 2181 ret = etm4_probe(dev); 2182 if (!ret) 2183 pm_runtime_put(&adev->dev); 2184 2185 return ret; 2186 } 2187 2188 static int etm4_probe_platform_dev(struct platform_device *pdev) 2189 { 2190 struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 2191 struct etmv4_drvdata *drvdata; 2192 int ret; 2193 2194 drvdata = devm_kzalloc(&pdev->dev, sizeof(*drvdata), GFP_KERNEL); 2195 if (!drvdata) 2196 return -ENOMEM; 2197 2198 drvdata->pclk = coresight_get_enable_apb_pclk(&pdev->dev); 2199 if (IS_ERR(drvdata->pclk)) 2200 return -ENODEV; 2201 2202 if (res) { 2203 drvdata->base = devm_ioremap_resource(&pdev->dev, res); 2204 if (IS_ERR(drvdata->base)) { 2205 clk_put(drvdata->pclk); 2206 return PTR_ERR(drvdata->base); 2207 } 2208 } 2209 2210 dev_set_drvdata(&pdev->dev, drvdata); 2211 pm_runtime_get_noresume(&pdev->dev); 2212 pm_runtime_set_active(&pdev->dev); 2213 pm_runtime_enable(&pdev->dev); 2214 2215 ret = etm4_probe(&pdev->dev); 2216 2217 pm_runtime_put(&pdev->dev); 2218 if (ret) 2219 pm_runtime_disable(&pdev->dev); 2220 2221 return ret; 2222 } 2223 2224 static int etm4_probe_cpu(unsigned int cpu) 2225 { 2226 int ret; 2227 struct etm4_init_arg init_arg; 2228 struct csdev_access access = { 0 }; 2229 struct etm4_init_arg *iap = *this_cpu_ptr(&delayed_probe); 2230 2231 if (!iap) 2232 return 0; 2233 2234 init_arg = *iap; 2235 devm_kfree(init_arg.dev, iap); 2236 *this_cpu_ptr(&delayed_probe) = NULL; 2237 2238 ret = pm_runtime_resume_and_get(init_arg.dev); 2239 if (ret < 0) { 2240 dev_err(init_arg.dev, "Failed to get PM runtime!\n"); 2241 return 0; 2242 } 2243 2244 init_arg.csa = &access; 2245 etm4_init_arch_data(&init_arg); 2246 2247 etm4_add_coresight_dev(&init_arg); 2248 2249 pm_runtime_put(init_arg.dev); 2250 return 0; 2251 } 2252 2253 static struct amba_cs_uci_id uci_id_etm4[] = { 2254 { 2255 /* ETMv4 UCI data */ 2256 .devarch = ETM_DEVARCH_ETMv4x_ARCH, 2257 .devarch_mask = ETM_DEVARCH_ID_MASK, 2258 .devtype = CS_DEVTYPE_PE_TRACE, 2259 } 2260 }; 2261 2262 static void clear_etmdrvdata(void *info) 2263 { 2264 int cpu = *(int *)info; 2265 2266 etmdrvdata[cpu] = NULL; 2267 per_cpu(delayed_probe, cpu) = NULL; 2268 } 2269 2270 static void etm4_remove_dev(struct etmv4_drvdata *drvdata) 2271 { 2272 bool had_delayed_probe; 2273 /* 2274 * Taking hotplug lock here to avoid racing between etm4_remove_dev() 2275 * and CPU hotplug call backs. 2276 */ 2277 cpus_read_lock(); 2278 2279 had_delayed_probe = per_cpu(delayed_probe, drvdata->cpu); 2280 2281 /* 2282 * The readers for etmdrvdata[] are CPU hotplug call backs 2283 * and PM notification call backs. Change etmdrvdata[i] on 2284 * CPU i ensures these call backs has consistent view 2285 * inside one call back function. 2286 */ 2287 if (smp_call_function_single(drvdata->cpu, clear_etmdrvdata, &drvdata->cpu, 1)) 2288 clear_etmdrvdata(&drvdata->cpu); 2289 2290 cpus_read_unlock(); 2291 2292 if (!had_delayed_probe) { 2293 etm_perf_symlink(drvdata->csdev, false); 2294 cscfg_unregister_csdev(drvdata->csdev); 2295 coresight_unregister(drvdata->csdev); 2296 } 2297 } 2298 2299 static void etm4_remove_amba(struct amba_device *adev) 2300 { 2301 struct etmv4_drvdata *drvdata = dev_get_drvdata(&adev->dev); 2302 2303 if (drvdata) 2304 etm4_remove_dev(drvdata); 2305 } 2306 2307 static void etm4_remove_platform_dev(struct platform_device *pdev) 2308 { 2309 struct etmv4_drvdata *drvdata = dev_get_drvdata(&pdev->dev); 2310 2311 if (drvdata) 2312 etm4_remove_dev(drvdata); 2313 pm_runtime_disable(&pdev->dev); 2314 2315 if (drvdata && !IS_ERR_OR_NULL(drvdata->pclk)) 2316 clk_put(drvdata->pclk); 2317 } 2318 2319 static const struct amba_id etm4_ids[] = { 2320 CS_AMBA_ID(0x000bb95d), /* Cortex-A53 */ 2321 CS_AMBA_ID(0x000bb95e), /* Cortex-A57 */ 2322 CS_AMBA_ID(0x000bb95a), /* Cortex-A72 */ 2323 CS_AMBA_ID(0x000bb959), /* Cortex-A73 */ 2324 CS_AMBA_UCI_ID(0x000bb9da, uci_id_etm4),/* Cortex-A35 */ 2325 CS_AMBA_UCI_ID(0x000bbd05, uci_id_etm4),/* Cortex-A55 */ 2326 CS_AMBA_UCI_ID(0x000bbd0a, uci_id_etm4),/* Cortex-A75 */ 2327 CS_AMBA_UCI_ID(0x000bbd0c, uci_id_etm4),/* Neoverse N1 */ 2328 CS_AMBA_UCI_ID(0x000bbd41, uci_id_etm4),/* Cortex-A78 */ 2329 CS_AMBA_UCI_ID(0x000f0205, uci_id_etm4),/* Qualcomm Kryo */ 2330 CS_AMBA_UCI_ID(0x000f0211, uci_id_etm4),/* Qualcomm Kryo */ 2331 CS_AMBA_UCI_ID(0x000bb802, uci_id_etm4),/* Qualcomm Kryo 385 Cortex-A55 */ 2332 CS_AMBA_UCI_ID(0x000bb803, uci_id_etm4),/* Qualcomm Kryo 385 Cortex-A75 */ 2333 CS_AMBA_UCI_ID(0x000bb805, uci_id_etm4),/* Qualcomm Kryo 4XX Cortex-A55 */ 2334 CS_AMBA_UCI_ID(0x000bb804, uci_id_etm4),/* Qualcomm Kryo 4XX Cortex-A76 */ 2335 CS_AMBA_UCI_ID(0x000bbd0d, uci_id_etm4),/* Qualcomm Kryo 5XX Cortex-A77 */ 2336 CS_AMBA_UCI_ID(0x000cc0af, uci_id_etm4),/* Marvell ThunderX2 */ 2337 CS_AMBA_UCI_ID(0x000b6d01, uci_id_etm4),/* HiSilicon-Hip08 */ 2338 CS_AMBA_UCI_ID(0x000b6d02, uci_id_etm4),/* HiSilicon-Hip09 */ 2339 /* 2340 * Match all PIDs with ETM4 DEVARCH. No need for adding any of the new 2341 * CPUs to the list here. 2342 */ 2343 CS_AMBA_MATCH_ALL_UCI(uci_id_etm4), 2344 {}, 2345 }; 2346 2347 MODULE_DEVICE_TABLE(amba, etm4_ids); 2348 2349 static struct amba_driver etm4x_amba_driver = { 2350 .drv = { 2351 .name = "coresight-etm4x", 2352 .suppress_bind_attrs = true, 2353 }, 2354 .probe = etm4_probe_amba, 2355 .remove = etm4_remove_amba, 2356 .id_table = etm4_ids, 2357 }; 2358 2359 #ifdef CONFIG_PM 2360 static int etm4_runtime_suspend(struct device *dev) 2361 { 2362 struct etmv4_drvdata *drvdata = dev_get_drvdata(dev); 2363 2364 if (drvdata->pclk && !IS_ERR(drvdata->pclk)) 2365 clk_disable_unprepare(drvdata->pclk); 2366 2367 return 0; 2368 } 2369 2370 static int etm4_runtime_resume(struct device *dev) 2371 { 2372 struct etmv4_drvdata *drvdata = dev_get_drvdata(dev); 2373 2374 if (drvdata->pclk && !IS_ERR(drvdata->pclk)) 2375 clk_prepare_enable(drvdata->pclk); 2376 2377 return 0; 2378 } 2379 #endif 2380 2381 static const struct dev_pm_ops etm4_dev_pm_ops = { 2382 SET_RUNTIME_PM_OPS(etm4_runtime_suspend, etm4_runtime_resume, NULL) 2383 }; 2384 2385 static const struct of_device_id etm4_sysreg_match[] = { 2386 { .compatible = "arm,coresight-etm4x-sysreg" }, 2387 { .compatible = "arm,embedded-trace-extension" }, 2388 {} 2389 }; 2390 2391 #ifdef CONFIG_ACPI 2392 static const struct acpi_device_id etm4x_acpi_ids[] = { 2393 {"ARMHC500", 0, 0, 0}, /* ARM CoreSight ETM4x */ 2394 {} 2395 }; 2396 MODULE_DEVICE_TABLE(acpi, etm4x_acpi_ids); 2397 #endif 2398 2399 static struct platform_driver etm4_platform_driver = { 2400 .probe = etm4_probe_platform_dev, 2401 .remove_new = etm4_remove_platform_dev, 2402 .driver = { 2403 .name = "coresight-etm4x", 2404 .of_match_table = etm4_sysreg_match, 2405 .acpi_match_table = ACPI_PTR(etm4x_acpi_ids), 2406 .suppress_bind_attrs = true, 2407 .pm = &etm4_dev_pm_ops, 2408 }, 2409 }; 2410 2411 static int __init etm4x_init(void) 2412 { 2413 int ret; 2414 2415 ret = etm4_pm_setup(); 2416 2417 /* etm4_pm_setup() does its own cleanup - exit on error */ 2418 if (ret) 2419 return ret; 2420 2421 ret = amba_driver_register(&etm4x_amba_driver); 2422 if (ret) { 2423 pr_err("Error registering etm4x AMBA driver\n"); 2424 goto clear_pm; 2425 } 2426 2427 ret = platform_driver_register(&etm4_platform_driver); 2428 if (!ret) 2429 return 0; 2430 2431 pr_err("Error registering etm4x platform driver\n"); 2432 amba_driver_unregister(&etm4x_amba_driver); 2433 2434 clear_pm: 2435 etm4_pm_clear(); 2436 return ret; 2437 } 2438 2439 static void __exit etm4x_exit(void) 2440 { 2441 amba_driver_unregister(&etm4x_amba_driver); 2442 platform_driver_unregister(&etm4_platform_driver); 2443 etm4_pm_clear(); 2444 } 2445 2446 module_init(etm4x_init); 2447 module_exit(etm4x_exit); 2448 2449 MODULE_AUTHOR("Pratik Patel <pratikp@codeaurora.org>"); 2450 MODULE_AUTHOR("Mathieu Poirier <mathieu.poirier@linaro.org>"); 2451 MODULE_DESCRIPTION("Arm CoreSight Program Flow Trace v4.x driver"); 2452 MODULE_LICENSE("GPL v2"); 2453