1 // SPDX-License-Identifier: GPL-2.0+ 2 // 3 // Torture test for smp_call_function() and friends. 4 // 5 // Copyright (C) Facebook, 2020. 6 // 7 // Author: Paul E. McKenney <paulmck@kernel.org> 8 9 #define pr_fmt(fmt) fmt 10 11 #include <linux/atomic.h> 12 #include <linux/bitops.h> 13 #include <linux/completion.h> 14 #include <linux/cpu.h> 15 #include <linux/delay.h> 16 #include <linux/err.h> 17 #include <linux/init.h> 18 #include <linux/interrupt.h> 19 #include <linux/kthread.h> 20 #include <linux/kernel.h> 21 #include <linux/mm.h> 22 #include <linux/module.h> 23 #include <linux/moduleparam.h> 24 #include <linux/notifier.h> 25 #include <linux/percpu.h> 26 #include <linux/rcupdate.h> 27 #include <linux/rcupdate_trace.h> 28 #include <linux/reboot.h> 29 #include <linux/sched.h> 30 #include <linux/spinlock.h> 31 #include <linux/smp.h> 32 #include <linux/stat.h> 33 #include <linux/srcu.h> 34 #include <linux/slab.h> 35 #include <linux/torture.h> 36 #include <linux/types.h> 37 38 #define SCFTORT_STRING "scftorture" 39 #define SCFTORT_FLAG SCFTORT_STRING ": " 40 41 #define VERBOSE_SCFTORTOUT(s, x...) \ 42 do { if (verbose) pr_alert(SCFTORT_FLAG s "\n", ## x); } while (0) 43 44 #define SCFTORTOUT_ERRSTRING(s, x...) pr_alert(SCFTORT_FLAG "!!! " s "\n", ## x) 45 46 MODULE_LICENSE("GPL"); 47 MODULE_AUTHOR("Paul E. McKenney <paulmck@kernel.org>"); 48 49 // Wait until there are multiple CPUs before starting test. 50 torture_param(int, holdoff, IS_BUILTIN(CONFIG_SCF_TORTURE_TEST) ? 10 : 0, 51 "Holdoff time before test start (s)"); 52 torture_param(int, longwait, 0, "Include ridiculously long waits? (seconds)"); 53 torture_param(int, nthreads, -1, "# threads, defaults to -1 for all CPUs."); 54 torture_param(int, onoff_holdoff, 0, "Time after boot before CPU hotplugs (s)"); 55 torture_param(int, onoff_interval, 0, "Time between CPU hotplugs (s), 0=disable"); 56 torture_param(int, shutdown_secs, 0, "Shutdown time (ms), <= zero to disable."); 57 torture_param(int, stat_interval, 60, "Number of seconds between stats printk()s."); 58 torture_param(int, stutter, 5, "Number of jiffies to run/halt test, 0=disable"); 59 torture_param(bool, use_cpus_read_lock, 0, "Use cpus_read_lock() to exclude CPU hotplug."); 60 torture_param(int, verbose, 0, "Enable verbose debugging printk()s"); 61 torture_param(int, weight_resched, -1, "Testing weight for resched_cpu() operations."); 62 torture_param(int, weight_single, -1, "Testing weight for single-CPU no-wait operations."); 63 torture_param(int, weight_single_rpc, -1, "Testing weight for single-CPU RPC operations."); 64 torture_param(int, weight_single_wait, -1, "Testing weight for single-CPU operations."); 65 torture_param(int, weight_many, -1, "Testing weight for multi-CPU no-wait operations."); 66 torture_param(int, weight_many_wait, -1, "Testing weight for multi-CPU operations."); 67 torture_param(int, weight_all, -1, "Testing weight for all-CPU no-wait operations."); 68 torture_param(int, weight_all_wait, -1, "Testing weight for all-CPU operations."); 69 70 char *torture_type = ""; 71 72 #ifdef MODULE 73 # define SCFTORT_SHUTDOWN 0 74 #else 75 # define SCFTORT_SHUTDOWN 1 76 #endif 77 78 torture_param(bool, shutdown, SCFTORT_SHUTDOWN, "Shutdown at end of torture test."); 79 80 struct scf_statistics { 81 struct task_struct *task; 82 int cpu; 83 long long n_resched; 84 long long n_single; 85 long long n_single_ofl; 86 long long n_single_rpc; 87 long long n_single_rpc_ofl; 88 long long n_single_wait; 89 long long n_single_wait_ofl; 90 long long n_many; 91 long long n_many_wait; 92 long long n_all; 93 long long n_all_wait; 94 }; 95 96 static struct scf_statistics *scf_stats_p; 97 static struct task_struct *scf_torture_stats_task; 98 static DEFINE_PER_CPU(long long, scf_invoked_count); 99 100 // Data for random primitive selection 101 #define SCF_PRIM_RESCHED 0 102 #define SCF_PRIM_SINGLE 1 103 #define SCF_PRIM_SINGLE_RPC 2 104 #define SCF_PRIM_MANY 3 105 #define SCF_PRIM_ALL 4 106 #define SCF_NPRIMS 8 // Need wait and no-wait versions of each, 107 // except for SCF_PRIM_RESCHED and 108 // SCF_PRIM_SINGLE_RPC. 109 110 static char *scf_prim_name[] = { 111 "resched_cpu", 112 "smp_call_function_single", 113 "smp_call_function_single_rpc", 114 "smp_call_function_many", 115 "smp_call_function", 116 }; 117 118 struct scf_selector { 119 unsigned long scfs_weight; 120 int scfs_prim; 121 bool scfs_wait; 122 }; 123 static struct scf_selector scf_sel_array[SCF_NPRIMS]; 124 static int scf_sel_array_len; 125 static unsigned long scf_sel_totweight; 126 127 // Communicate between caller and handler. 128 struct scf_check { 129 bool scfc_in; 130 bool scfc_out; 131 int scfc_cpu; // -1 for not _single(). 132 bool scfc_wait; 133 bool scfc_rpc; 134 struct completion scfc_completion; 135 }; 136 137 // Use to wait for all threads to start. 138 static atomic_t n_started; 139 static atomic_t n_errs; 140 static atomic_t n_mb_in_errs; 141 static atomic_t n_mb_out_errs; 142 static atomic_t n_alloc_errs; 143 static bool scfdone; 144 static char *bangstr = ""; 145 146 static DEFINE_TORTURE_RANDOM_PERCPU(scf_torture_rand); 147 148 extern void resched_cpu(int cpu); // An alternative IPI vector. 149 150 // Print torture statistics. Caller must ensure serialization. 151 static void scf_torture_stats_print(void) 152 { 153 int cpu; 154 int i; 155 long long invoked_count = 0; 156 bool isdone = READ_ONCE(scfdone); 157 struct scf_statistics scfs = {}; 158 159 for_each_possible_cpu(cpu) 160 invoked_count += data_race(per_cpu(scf_invoked_count, cpu)); 161 for (i = 0; i < nthreads; i++) { 162 scfs.n_resched += scf_stats_p[i].n_resched; 163 scfs.n_single += scf_stats_p[i].n_single; 164 scfs.n_single_ofl += scf_stats_p[i].n_single_ofl; 165 scfs.n_single_rpc += scf_stats_p[i].n_single_rpc; 166 scfs.n_single_wait += scf_stats_p[i].n_single_wait; 167 scfs.n_single_wait_ofl += scf_stats_p[i].n_single_wait_ofl; 168 scfs.n_many += scf_stats_p[i].n_many; 169 scfs.n_many_wait += scf_stats_p[i].n_many_wait; 170 scfs.n_all += scf_stats_p[i].n_all; 171 scfs.n_all_wait += scf_stats_p[i].n_all_wait; 172 } 173 if (atomic_read(&n_errs) || atomic_read(&n_mb_in_errs) || 174 atomic_read(&n_mb_out_errs) || atomic_read(&n_alloc_errs)) 175 bangstr = "!!! "; 176 pr_alert("%s %sscf_invoked_count %s: %lld resched: %lld single: %lld/%lld single_ofl: %lld/%lld single_rpc: %lld single_rpc_ofl: %lld many: %lld/%lld all: %lld/%lld ", 177 SCFTORT_FLAG, bangstr, isdone ? "VER" : "ver", invoked_count, scfs.n_resched, 178 scfs.n_single, scfs.n_single_wait, scfs.n_single_ofl, scfs.n_single_wait_ofl, 179 scfs.n_single_rpc, scfs.n_single_rpc_ofl, 180 scfs.n_many, scfs.n_many_wait, scfs.n_all, scfs.n_all_wait); 181 torture_onoff_stats(); 182 pr_cont("ste: %d stnmie: %d stnmoe: %d staf: %d\n", atomic_read(&n_errs), 183 atomic_read(&n_mb_in_errs), atomic_read(&n_mb_out_errs), 184 atomic_read(&n_alloc_errs)); 185 } 186 187 // Periodically prints torture statistics, if periodic statistics printing 188 // was specified via the stat_interval module parameter. 189 static int 190 scf_torture_stats(void *arg) 191 { 192 VERBOSE_TOROUT_STRING("scf_torture_stats task started"); 193 do { 194 schedule_timeout_interruptible(stat_interval * HZ); 195 scf_torture_stats_print(); 196 torture_shutdown_absorb("scf_torture_stats"); 197 } while (!torture_must_stop()); 198 torture_kthread_stopping("scf_torture_stats"); 199 return 0; 200 } 201 202 // Add a primitive to the scf_sel_array[]. 203 static void scf_sel_add(unsigned long weight, int prim, bool wait) 204 { 205 struct scf_selector *scfsp = &scf_sel_array[scf_sel_array_len]; 206 207 // If no weight, if array would overflow, if computing three-place 208 // percentages would overflow, or if the scf_prim_name[] array would 209 // overflow, don't bother. In the last three two cases, complain. 210 if (!weight || 211 WARN_ON_ONCE(scf_sel_array_len >= ARRAY_SIZE(scf_sel_array)) || 212 WARN_ON_ONCE(0 - 100000 * weight <= 100000 * scf_sel_totweight) || 213 WARN_ON_ONCE(prim >= ARRAY_SIZE(scf_prim_name))) 214 return; 215 scf_sel_totweight += weight; 216 scfsp->scfs_weight = scf_sel_totweight; 217 scfsp->scfs_prim = prim; 218 scfsp->scfs_wait = wait; 219 scf_sel_array_len++; 220 } 221 222 // Dump out weighting percentages for scf_prim_name[] array. 223 static void scf_sel_dump(void) 224 { 225 int i; 226 unsigned long oldw = 0; 227 struct scf_selector *scfsp; 228 unsigned long w; 229 230 for (i = 0; i < scf_sel_array_len; i++) { 231 scfsp = &scf_sel_array[i]; 232 w = (scfsp->scfs_weight - oldw) * 100000 / scf_sel_totweight; 233 pr_info("%s: %3lu.%03lu %s(%s)\n", __func__, w / 1000, w % 1000, 234 scf_prim_name[scfsp->scfs_prim], 235 scfsp->scfs_wait ? "wait" : "nowait"); 236 oldw = scfsp->scfs_weight; 237 } 238 } 239 240 // Randomly pick a primitive and wait/nowait, based on weightings. 241 static struct scf_selector *scf_sel_rand(struct torture_random_state *trsp) 242 { 243 int i; 244 unsigned long w = torture_random(trsp) % (scf_sel_totweight + 1); 245 246 for (i = 0; i < scf_sel_array_len; i++) 247 if (scf_sel_array[i].scfs_weight >= w) 248 return &scf_sel_array[i]; 249 WARN_ON_ONCE(1); 250 return &scf_sel_array[0]; 251 } 252 253 // Update statistics and occasionally burn up mass quantities of CPU time, 254 // if told to do so via scftorture.longwait. Otherwise, occasionally burn 255 // a little bit. 256 static void scf_handler(void *scfc_in) 257 { 258 int i; 259 int j; 260 unsigned long r = torture_random(this_cpu_ptr(&scf_torture_rand)); 261 struct scf_check *scfcp = scfc_in; 262 263 if (likely(scfcp)) { 264 WRITE_ONCE(scfcp->scfc_out, false); // For multiple receivers. 265 if (WARN_ON_ONCE(unlikely(!READ_ONCE(scfcp->scfc_in)))) 266 atomic_inc(&n_mb_in_errs); 267 } 268 this_cpu_inc(scf_invoked_count); 269 if (longwait <= 0) { 270 if (!(r & 0xffc0)) 271 udelay(r & 0x3f); 272 goto out; 273 } 274 if (r & 0xfff) 275 goto out; 276 r = (r >> 12); 277 if (longwait <= 0) { 278 udelay((r & 0xff) + 1); 279 goto out; 280 } 281 r = r % longwait + 1; 282 for (i = 0; i < r; i++) { 283 for (j = 0; j < 1000; j++) { 284 udelay(1000); 285 cpu_relax(); 286 } 287 } 288 out: 289 if (unlikely(!scfcp)) 290 return; 291 if (scfcp->scfc_wait) { 292 WRITE_ONCE(scfcp->scfc_out, true); 293 if (scfcp->scfc_rpc) 294 complete(&scfcp->scfc_completion); 295 } else { 296 kfree(scfcp); 297 } 298 } 299 300 // As above, but check for correct CPU. 301 static void scf_handler_1(void *scfc_in) 302 { 303 struct scf_check *scfcp = scfc_in; 304 305 if (likely(scfcp) && WARN_ONCE(smp_processor_id() != scfcp->scfc_cpu, "%s: Wanted CPU %d got CPU %d\n", __func__, scfcp->scfc_cpu, smp_processor_id())) { 306 atomic_inc(&n_errs); 307 } 308 scf_handler(scfcp); 309 } 310 311 // Randomly do an smp_call_function*() invocation. 312 static void scftorture_invoke_one(struct scf_statistics *scfp, struct torture_random_state *trsp) 313 { 314 uintptr_t cpu; 315 int ret = 0; 316 struct scf_check *scfcp = NULL; 317 struct scf_selector *scfsp = scf_sel_rand(trsp); 318 319 if (use_cpus_read_lock) 320 cpus_read_lock(); 321 else 322 preempt_disable(); 323 if (scfsp->scfs_prim == SCF_PRIM_SINGLE || scfsp->scfs_wait) { 324 scfcp = kmalloc(sizeof(*scfcp), GFP_ATOMIC); 325 if (WARN_ON_ONCE(!scfcp)) { 326 atomic_inc(&n_alloc_errs); 327 } else { 328 scfcp->scfc_cpu = -1; 329 scfcp->scfc_wait = scfsp->scfs_wait; 330 scfcp->scfc_out = false; 331 scfcp->scfc_rpc = false; 332 } 333 } 334 switch (scfsp->scfs_prim) { 335 case SCF_PRIM_RESCHED: 336 if (IS_BUILTIN(CONFIG_SCF_TORTURE_TEST)) { 337 cpu = torture_random(trsp) % nr_cpu_ids; 338 scfp->n_resched++; 339 resched_cpu(cpu); 340 this_cpu_inc(scf_invoked_count); 341 } 342 break; 343 case SCF_PRIM_SINGLE: 344 cpu = torture_random(trsp) % nr_cpu_ids; 345 if (scfsp->scfs_wait) 346 scfp->n_single_wait++; 347 else 348 scfp->n_single++; 349 if (scfcp) { 350 scfcp->scfc_cpu = cpu; 351 barrier(); // Prevent race-reduction compiler optimizations. 352 scfcp->scfc_in = true; 353 } 354 ret = smp_call_function_single(cpu, scf_handler_1, (void *)scfcp, scfsp->scfs_wait); 355 if (ret) { 356 if (scfsp->scfs_wait) 357 scfp->n_single_wait_ofl++; 358 else 359 scfp->n_single_ofl++; 360 kfree(scfcp); 361 scfcp = NULL; 362 } 363 break; 364 case SCF_PRIM_SINGLE_RPC: 365 if (!scfcp) 366 break; 367 cpu = torture_random(trsp) % nr_cpu_ids; 368 scfp->n_single_rpc++; 369 scfcp->scfc_cpu = cpu; 370 scfcp->scfc_wait = true; 371 init_completion(&scfcp->scfc_completion); 372 scfcp->scfc_rpc = true; 373 barrier(); // Prevent race-reduction compiler optimizations. 374 scfcp->scfc_in = true; 375 ret = smp_call_function_single(cpu, scf_handler_1, (void *)scfcp, 0); 376 if (!ret) { 377 if (use_cpus_read_lock) 378 cpus_read_unlock(); 379 else 380 preempt_enable(); 381 wait_for_completion(&scfcp->scfc_completion); 382 if (use_cpus_read_lock) 383 cpus_read_lock(); 384 else 385 preempt_disable(); 386 } else { 387 scfp->n_single_rpc_ofl++; 388 kfree(scfcp); 389 scfcp = NULL; 390 } 391 break; 392 case SCF_PRIM_MANY: 393 if (scfsp->scfs_wait) 394 scfp->n_many_wait++; 395 else 396 scfp->n_many++; 397 if (scfcp) { 398 barrier(); // Prevent race-reduction compiler optimizations. 399 scfcp->scfc_in = true; 400 } 401 smp_call_function_many(cpu_online_mask, scf_handler, scfcp, scfsp->scfs_wait); 402 break; 403 case SCF_PRIM_ALL: 404 if (scfsp->scfs_wait) 405 scfp->n_all_wait++; 406 else 407 scfp->n_all++; 408 if (scfcp) { 409 barrier(); // Prevent race-reduction compiler optimizations. 410 scfcp->scfc_in = true; 411 } 412 smp_call_function(scf_handler, scfcp, scfsp->scfs_wait); 413 break; 414 default: 415 WARN_ON_ONCE(1); 416 if (scfcp) 417 scfcp->scfc_out = true; 418 } 419 if (scfcp && scfsp->scfs_wait) { 420 if (WARN_ON_ONCE((num_online_cpus() > 1 || scfsp->scfs_prim == SCF_PRIM_SINGLE) && 421 !scfcp->scfc_out)) { 422 pr_warn("%s: Memory-ordering failure, scfs_prim: %d.\n", __func__, scfsp->scfs_prim); 423 atomic_inc(&n_mb_out_errs); // Leak rather than trash! 424 } else { 425 kfree(scfcp); 426 } 427 barrier(); // Prevent race-reduction compiler optimizations. 428 } 429 if (use_cpus_read_lock) 430 cpus_read_unlock(); 431 else 432 preempt_enable(); 433 if (!(torture_random(trsp) & 0xfff)) 434 schedule_timeout_uninterruptible(1); 435 } 436 437 // SCF test kthread. Repeatedly does calls to members of the 438 // smp_call_function() family of functions. 439 static int scftorture_invoker(void *arg) 440 { 441 int cpu; 442 int curcpu; 443 DEFINE_TORTURE_RANDOM(rand); 444 struct scf_statistics *scfp = (struct scf_statistics *)arg; 445 bool was_offline = false; 446 447 VERBOSE_SCFTORTOUT("scftorture_invoker %d: task started", scfp->cpu); 448 cpu = scfp->cpu % nr_cpu_ids; 449 WARN_ON_ONCE(set_cpus_allowed_ptr(current, cpumask_of(cpu))); 450 set_user_nice(current, MAX_NICE); 451 if (holdoff) 452 schedule_timeout_interruptible(holdoff * HZ); 453 454 VERBOSE_SCFTORTOUT("scftorture_invoker %d: Waiting for all SCF torturers from cpu %d", scfp->cpu, raw_smp_processor_id()); 455 456 // Make sure that the CPU is affinitized appropriately during testing. 457 curcpu = raw_smp_processor_id(); 458 WARN_ONCE(curcpu != scfp->cpu % nr_cpu_ids, 459 "%s: Wanted CPU %d, running on %d, nr_cpu_ids = %d\n", 460 __func__, scfp->cpu, curcpu, nr_cpu_ids); 461 462 if (!atomic_dec_return(&n_started)) 463 while (atomic_read_acquire(&n_started)) { 464 if (torture_must_stop()) { 465 VERBOSE_SCFTORTOUT("scftorture_invoker %d ended before starting", scfp->cpu); 466 goto end; 467 } 468 schedule_timeout_uninterruptible(1); 469 } 470 471 VERBOSE_SCFTORTOUT("scftorture_invoker %d started", scfp->cpu); 472 473 do { 474 scftorture_invoke_one(scfp, &rand); 475 while (cpu_is_offline(cpu) && !torture_must_stop()) { 476 schedule_timeout_interruptible(HZ / 5); 477 was_offline = true; 478 } 479 if (was_offline) { 480 set_cpus_allowed_ptr(current, cpumask_of(cpu)); 481 was_offline = false; 482 } 483 cond_resched(); 484 stutter_wait("scftorture_invoker"); 485 } while (!torture_must_stop()); 486 487 VERBOSE_SCFTORTOUT("scftorture_invoker %d ended", scfp->cpu); 488 end: 489 torture_kthread_stopping("scftorture_invoker"); 490 return 0; 491 } 492 493 static void 494 scftorture_print_module_parms(const char *tag) 495 { 496 pr_alert(SCFTORT_FLAG 497 "--- %s: verbose=%d holdoff=%d longwait=%d nthreads=%d onoff_holdoff=%d onoff_interval=%d shutdown_secs=%d stat_interval=%d stutter=%d use_cpus_read_lock=%d, weight_resched=%d, weight_single=%d, weight_single_rpc=%d, weight_single_wait=%d, weight_many=%d, weight_many_wait=%d, weight_all=%d, weight_all_wait=%d\n", tag, 498 verbose, holdoff, longwait, nthreads, onoff_holdoff, onoff_interval, shutdown, stat_interval, stutter, use_cpus_read_lock, weight_resched, weight_single, weight_single_rpc, weight_single_wait, weight_many, weight_many_wait, weight_all, weight_all_wait); 499 } 500 501 static void scf_cleanup_handler(void *unused) 502 { 503 } 504 505 static void scf_torture_cleanup(void) 506 { 507 int i; 508 509 if (torture_cleanup_begin()) 510 return; 511 512 WRITE_ONCE(scfdone, true); 513 if (nthreads && scf_stats_p) 514 for (i = 0; i < nthreads; i++) 515 torture_stop_kthread("scftorture_invoker", scf_stats_p[i].task); 516 else 517 goto end; 518 smp_call_function(scf_cleanup_handler, NULL, 0); 519 torture_stop_kthread(scf_torture_stats, scf_torture_stats_task); 520 scf_torture_stats_print(); // -After- the stats thread is stopped! 521 kfree(scf_stats_p); // -After- the last stats print has completed! 522 scf_stats_p = NULL; 523 524 if (atomic_read(&n_errs) || atomic_read(&n_mb_in_errs) || atomic_read(&n_mb_out_errs)) 525 scftorture_print_module_parms("End of test: FAILURE"); 526 else if (torture_onoff_failures()) 527 scftorture_print_module_parms("End of test: LOCK_HOTPLUG"); 528 else 529 scftorture_print_module_parms("End of test: SUCCESS"); 530 531 end: 532 torture_cleanup_end(); 533 } 534 535 static int __init scf_torture_init(void) 536 { 537 long i; 538 int firsterr = 0; 539 unsigned long weight_resched1 = weight_resched; 540 unsigned long weight_single1 = weight_single; 541 unsigned long weight_single_rpc1 = weight_single_rpc; 542 unsigned long weight_single_wait1 = weight_single_wait; 543 unsigned long weight_many1 = weight_many; 544 unsigned long weight_many_wait1 = weight_many_wait; 545 unsigned long weight_all1 = weight_all; 546 unsigned long weight_all_wait1 = weight_all_wait; 547 548 if (!torture_init_begin(SCFTORT_STRING, verbose)) 549 return -EBUSY; 550 551 scftorture_print_module_parms("Start of test"); 552 553 if (weight_resched <= 0 && 554 weight_single <= 0 && weight_single_rpc <= 0 && weight_single_wait <= 0 && 555 weight_many <= 0 && weight_many_wait <= 0 && 556 weight_all <= 0 && weight_all_wait <= 0) { 557 weight_resched1 = weight_resched == 0 ? 0 : 2 * nr_cpu_ids; 558 weight_single1 = weight_single == 0 ? 0 : 2 * nr_cpu_ids; 559 weight_single_rpc1 = weight_single_rpc == 0 ? 0 : 2 * nr_cpu_ids; 560 weight_single_wait1 = weight_single_wait == 0 ? 0 : 2 * nr_cpu_ids; 561 weight_many1 = weight_many == 0 ? 0 : 2; 562 weight_many_wait1 = weight_many_wait == 0 ? 0 : 2; 563 weight_all1 = weight_all == 0 ? 0 : 1; 564 weight_all_wait1 = weight_all_wait == 0 ? 0 : 1; 565 } else { 566 if (weight_resched == -1) 567 weight_resched1 = 0; 568 if (weight_single == -1) 569 weight_single1 = 0; 570 if (weight_single_rpc == -1) 571 weight_single_rpc1 = 0; 572 if (weight_single_wait == -1) 573 weight_single_wait1 = 0; 574 if (weight_many == -1) 575 weight_many1 = 0; 576 if (weight_many_wait == -1) 577 weight_many_wait1 = 0; 578 if (weight_all == -1) 579 weight_all1 = 0; 580 if (weight_all_wait == -1) 581 weight_all_wait1 = 0; 582 } 583 if (weight_resched1 == 0 && weight_single1 == 0 && weight_single_rpc1 == 0 && 584 weight_single_wait1 == 0 && weight_many1 == 0 && weight_many_wait1 == 0 && 585 weight_all1 == 0 && weight_all_wait1 == 0) { 586 SCFTORTOUT_ERRSTRING("all zero weights makes no sense"); 587 firsterr = -EINVAL; 588 goto unwind; 589 } 590 if (IS_BUILTIN(CONFIG_SCF_TORTURE_TEST)) 591 scf_sel_add(weight_resched1, SCF_PRIM_RESCHED, false); 592 else if (weight_resched1) 593 SCFTORTOUT_ERRSTRING("built as module, weight_resched ignored"); 594 scf_sel_add(weight_single1, SCF_PRIM_SINGLE, false); 595 scf_sel_add(weight_single_rpc1, SCF_PRIM_SINGLE_RPC, true); 596 scf_sel_add(weight_single_wait1, SCF_PRIM_SINGLE, true); 597 scf_sel_add(weight_many1, SCF_PRIM_MANY, false); 598 scf_sel_add(weight_many_wait1, SCF_PRIM_MANY, true); 599 scf_sel_add(weight_all1, SCF_PRIM_ALL, false); 600 scf_sel_add(weight_all_wait1, SCF_PRIM_ALL, true); 601 scf_sel_dump(); 602 603 if (onoff_interval > 0) { 604 firsterr = torture_onoff_init(onoff_holdoff * HZ, onoff_interval, NULL); 605 if (torture_init_error(firsterr)) 606 goto unwind; 607 } 608 if (shutdown_secs > 0) { 609 firsterr = torture_shutdown_init(shutdown_secs, scf_torture_cleanup); 610 if (torture_init_error(firsterr)) 611 goto unwind; 612 } 613 if (stutter > 0) { 614 firsterr = torture_stutter_init(stutter, stutter); 615 if (torture_init_error(firsterr)) 616 goto unwind; 617 } 618 619 // Worker tasks invoking smp_call_function(). 620 if (nthreads < 0) 621 nthreads = num_online_cpus(); 622 scf_stats_p = kcalloc(nthreads, sizeof(scf_stats_p[0]), GFP_KERNEL); 623 if (!scf_stats_p) { 624 SCFTORTOUT_ERRSTRING("out of memory"); 625 firsterr = -ENOMEM; 626 goto unwind; 627 } 628 629 VERBOSE_SCFTORTOUT("Starting %d smp_call_function() threads", nthreads); 630 631 atomic_set(&n_started, nthreads); 632 for (i = 0; i < nthreads; i++) { 633 scf_stats_p[i].cpu = i; 634 firsterr = torture_create_kthread(scftorture_invoker, (void *)&scf_stats_p[i], 635 scf_stats_p[i].task); 636 if (torture_init_error(firsterr)) 637 goto unwind; 638 } 639 if (stat_interval > 0) { 640 firsterr = torture_create_kthread(scf_torture_stats, NULL, scf_torture_stats_task); 641 if (torture_init_error(firsterr)) 642 goto unwind; 643 } 644 645 torture_init_end(); 646 return 0; 647 648 unwind: 649 torture_init_end(); 650 scf_torture_cleanup(); 651 if (shutdown_secs) { 652 WARN_ON(!IS_MODULE(CONFIG_SCF_TORTURE_TEST)); 653 kernel_power_off(); 654 } 655 return firsterr; 656 } 657 658 module_init(scf_torture_init); 659 module_exit(scf_torture_cleanup); 660