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 SCFTORTOUT(s, x...) \ 42 pr_alert(SCFTORT_FLAG s, ## x) 43 44 #define VERBOSE_SCFTORTOUT(s, x...) \ 45 do { if (verbose) pr_alert(SCFTORT_FLAG s, ## x); } while (0) 46 47 #define VERBOSE_SCFTORTOUT_ERRSTRING(s, x...) \ 48 do { if (verbose) pr_alert(SCFTORT_FLAG "!!! " s, ## x); } while (0) 49 50 MODULE_LICENSE("GPL"); 51 MODULE_AUTHOR("Paul E. McKenney <paulmck@kernel.org>"); 52 53 // Wait until there are multiple CPUs before starting test. 54 torture_param(int, holdoff, IS_BUILTIN(CONFIG_SCF_TORTURE_TEST) ? 10 : 0, 55 "Holdoff time before test start (s)"); 56 torture_param(int, longwait, 0, "Include ridiculously long waits? (seconds)"); 57 torture_param(int, nthreads, -1, "# threads, defaults to -1 for all CPUs."); 58 torture_param(int, onoff_holdoff, 0, "Time after boot before CPU hotplugs (s)"); 59 torture_param(int, onoff_interval, 0, "Time between CPU hotplugs (s), 0=disable"); 60 torture_param(int, shutdown_secs, 0, "Shutdown time (ms), <= zero to disable."); 61 torture_param(int, stat_interval, 60, "Number of seconds between stats printk()s."); 62 torture_param(int, stutter, 5, "Number of jiffies to run/halt test, 0=disable"); 63 torture_param(bool, use_cpus_read_lock, 0, "Use cpus_read_lock() to exclude CPU hotplug."); 64 torture_param(int, verbose, 0, "Enable verbose debugging printk()s"); 65 torture_param(int, weight_resched, -1, "Testing weight for resched_cpu() operations."); 66 torture_param(int, weight_single, -1, "Testing weight for single-CPU no-wait operations."); 67 torture_param(int, weight_single_rpc, -1, "Testing weight for single-CPU RPC operations."); 68 torture_param(int, weight_single_wait, -1, "Testing weight for single-CPU operations."); 69 torture_param(int, weight_many, -1, "Testing weight for multi-CPU no-wait operations."); 70 torture_param(int, weight_many_wait, -1, "Testing weight for multi-CPU operations."); 71 torture_param(int, weight_all, -1, "Testing weight for all-CPU no-wait operations."); 72 torture_param(int, weight_all_wait, -1, "Testing weight for all-CPU operations."); 73 74 char *torture_type = ""; 75 76 #ifdef MODULE 77 # define SCFTORT_SHUTDOWN 0 78 #else 79 # define SCFTORT_SHUTDOWN 1 80 #endif 81 82 torture_param(bool, shutdown, SCFTORT_SHUTDOWN, "Shutdown at end of torture test."); 83 84 struct scf_statistics { 85 struct task_struct *task; 86 int cpu; 87 long long n_resched; 88 long long n_single; 89 long long n_single_ofl; 90 long long n_single_rpc; 91 long long n_single_rpc_ofl; 92 long long n_single_wait; 93 long long n_single_wait_ofl; 94 long long n_many; 95 long long n_many_wait; 96 long long n_all; 97 long long n_all_wait; 98 }; 99 100 static struct scf_statistics *scf_stats_p; 101 static struct task_struct *scf_torture_stats_task; 102 static DEFINE_PER_CPU(long long, scf_invoked_count); 103 104 // Data for random primitive selection 105 #define SCF_PRIM_RESCHED 0 106 #define SCF_PRIM_SINGLE 1 107 #define SCF_PRIM_SINGLE_RPC 2 108 #define SCF_PRIM_MANY 3 109 #define SCF_PRIM_ALL 4 110 #define SCF_NPRIMS 8 // Need wait and no-wait versions of each, 111 // except for SCF_PRIM_RESCHED and 112 // SCF_PRIM_SINGLE_RPC. 113 114 static char *scf_prim_name[] = { 115 "resched_cpu", 116 "smp_call_function_single", 117 "smp_call_function_single_rpc", 118 "smp_call_function_many", 119 "smp_call_function", 120 }; 121 122 struct scf_selector { 123 unsigned long scfs_weight; 124 int scfs_prim; 125 bool scfs_wait; 126 }; 127 static struct scf_selector scf_sel_array[SCF_NPRIMS]; 128 static int scf_sel_array_len; 129 static unsigned long scf_sel_totweight; 130 131 // Communicate between caller and handler. 132 struct scf_check { 133 bool scfc_in; 134 bool scfc_out; 135 int scfc_cpu; // -1 for not _single(). 136 bool scfc_wait; 137 bool scfc_rpc; 138 struct completion scfc_completion; 139 }; 140 141 // Use to wait for all threads to start. 142 static atomic_t n_started; 143 static atomic_t n_errs; 144 static atomic_t n_mb_in_errs; 145 static atomic_t n_mb_out_errs; 146 static atomic_t n_alloc_errs; 147 static bool scfdone; 148 static char *bangstr = ""; 149 150 static DEFINE_TORTURE_RANDOM_PERCPU(scf_torture_rand); 151 152 extern void resched_cpu(int cpu); // An alternative IPI vector. 153 154 // Print torture statistics. Caller must ensure serialization. 155 static void scf_torture_stats_print(void) 156 { 157 int cpu; 158 int i; 159 long long invoked_count = 0; 160 bool isdone = READ_ONCE(scfdone); 161 struct scf_statistics scfs = {}; 162 163 for_each_possible_cpu(cpu) 164 invoked_count += data_race(per_cpu(scf_invoked_count, cpu)); 165 for (i = 0; i < nthreads; i++) { 166 scfs.n_resched += scf_stats_p[i].n_resched; 167 scfs.n_single += scf_stats_p[i].n_single; 168 scfs.n_single_ofl += scf_stats_p[i].n_single_ofl; 169 scfs.n_single_rpc += scf_stats_p[i].n_single_rpc; 170 scfs.n_single_wait += scf_stats_p[i].n_single_wait; 171 scfs.n_single_wait_ofl += scf_stats_p[i].n_single_wait_ofl; 172 scfs.n_many += scf_stats_p[i].n_many; 173 scfs.n_many_wait += scf_stats_p[i].n_many_wait; 174 scfs.n_all += scf_stats_p[i].n_all; 175 scfs.n_all_wait += scf_stats_p[i].n_all_wait; 176 } 177 if (atomic_read(&n_errs) || atomic_read(&n_mb_in_errs) || 178 atomic_read(&n_mb_out_errs) || atomic_read(&n_alloc_errs)) 179 bangstr = "!!! "; 180 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 ", 181 SCFTORT_FLAG, bangstr, isdone ? "VER" : "ver", invoked_count, scfs.n_resched, 182 scfs.n_single, scfs.n_single_wait, scfs.n_single_ofl, scfs.n_single_wait_ofl, 183 scfs.n_single_rpc, scfs.n_single_rpc_ofl, 184 scfs.n_many, scfs.n_many_wait, scfs.n_all, scfs.n_all_wait); 185 torture_onoff_stats(); 186 pr_cont("ste: %d stnmie: %d stnmoe: %d staf: %d\n", atomic_read(&n_errs), 187 atomic_read(&n_mb_in_errs), atomic_read(&n_mb_out_errs), 188 atomic_read(&n_alloc_errs)); 189 } 190 191 // Periodically prints torture statistics, if periodic statistics printing 192 // was specified via the stat_interval module parameter. 193 static int 194 scf_torture_stats(void *arg) 195 { 196 VERBOSE_TOROUT_STRING("scf_torture_stats task started"); 197 do { 198 schedule_timeout_interruptible(stat_interval * HZ); 199 scf_torture_stats_print(); 200 torture_shutdown_absorb("scf_torture_stats"); 201 } while (!torture_must_stop()); 202 torture_kthread_stopping("scf_torture_stats"); 203 return 0; 204 } 205 206 // Add a primitive to the scf_sel_array[]. 207 static void scf_sel_add(unsigned long weight, int prim, bool wait) 208 { 209 struct scf_selector *scfsp = &scf_sel_array[scf_sel_array_len]; 210 211 // If no weight, if array would overflow, if computing three-place 212 // percentages would overflow, or if the scf_prim_name[] array would 213 // overflow, don't bother. In the last three two cases, complain. 214 if (!weight || 215 WARN_ON_ONCE(scf_sel_array_len >= ARRAY_SIZE(scf_sel_array)) || 216 WARN_ON_ONCE(0 - 100000 * weight <= 100000 * scf_sel_totweight) || 217 WARN_ON_ONCE(prim >= ARRAY_SIZE(scf_prim_name))) 218 return; 219 scf_sel_totweight += weight; 220 scfsp->scfs_weight = scf_sel_totweight; 221 scfsp->scfs_prim = prim; 222 scfsp->scfs_wait = wait; 223 scf_sel_array_len++; 224 } 225 226 // Dump out weighting percentages for scf_prim_name[] array. 227 static void scf_sel_dump(void) 228 { 229 int i; 230 unsigned long oldw = 0; 231 struct scf_selector *scfsp; 232 unsigned long w; 233 234 for (i = 0; i < scf_sel_array_len; i++) { 235 scfsp = &scf_sel_array[i]; 236 w = (scfsp->scfs_weight - oldw) * 100000 / scf_sel_totweight; 237 pr_info("%s: %3lu.%03lu %s(%s)\n", __func__, w / 1000, w % 1000, 238 scf_prim_name[scfsp->scfs_prim], 239 scfsp->scfs_wait ? "wait" : "nowait"); 240 oldw = scfsp->scfs_weight; 241 } 242 } 243 244 // Randomly pick a primitive and wait/nowait, based on weightings. 245 static struct scf_selector *scf_sel_rand(struct torture_random_state *trsp) 246 { 247 int i; 248 unsigned long w = torture_random(trsp) % (scf_sel_totweight + 1); 249 250 for (i = 0; i < scf_sel_array_len; i++) 251 if (scf_sel_array[i].scfs_weight >= w) 252 return &scf_sel_array[i]; 253 WARN_ON_ONCE(1); 254 return &scf_sel_array[0]; 255 } 256 257 // Update statistics and occasionally burn up mass quantities of CPU time, 258 // if told to do so via scftorture.longwait. Otherwise, occasionally burn 259 // a little bit. 260 static void scf_handler(void *scfc_in) 261 { 262 int i; 263 int j; 264 unsigned long r = torture_random(this_cpu_ptr(&scf_torture_rand)); 265 struct scf_check *scfcp = scfc_in; 266 267 if (likely(scfcp)) { 268 WRITE_ONCE(scfcp->scfc_out, false); // For multiple receivers. 269 if (WARN_ON_ONCE(unlikely(!READ_ONCE(scfcp->scfc_in)))) 270 atomic_inc(&n_mb_in_errs); 271 } 272 this_cpu_inc(scf_invoked_count); 273 if (longwait <= 0) { 274 if (!(r & 0xffc0)) 275 udelay(r & 0x3f); 276 goto out; 277 } 278 if (r & 0xfff) 279 goto out; 280 r = (r >> 12); 281 if (longwait <= 0) { 282 udelay((r & 0xff) + 1); 283 goto out; 284 } 285 r = r % longwait + 1; 286 for (i = 0; i < r; i++) { 287 for (j = 0; j < 1000; j++) { 288 udelay(1000); 289 cpu_relax(); 290 } 291 } 292 out: 293 if (unlikely(!scfcp)) 294 return; 295 if (scfcp->scfc_wait) { 296 WRITE_ONCE(scfcp->scfc_out, true); 297 if (scfcp->scfc_rpc) 298 complete(&scfcp->scfc_completion); 299 } else { 300 kfree(scfcp); 301 } 302 } 303 304 // As above, but check for correct CPU. 305 static void scf_handler_1(void *scfc_in) 306 { 307 struct scf_check *scfcp = scfc_in; 308 309 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())) { 310 atomic_inc(&n_errs); 311 } 312 scf_handler(scfcp); 313 } 314 315 // Randomly do an smp_call_function*() invocation. 316 static void scftorture_invoke_one(struct scf_statistics *scfp, struct torture_random_state *trsp) 317 { 318 uintptr_t cpu; 319 int ret = 0; 320 struct scf_check *scfcp = NULL; 321 struct scf_selector *scfsp = scf_sel_rand(trsp); 322 323 if (use_cpus_read_lock) 324 cpus_read_lock(); 325 else 326 preempt_disable(); 327 if (scfsp->scfs_prim == SCF_PRIM_SINGLE || scfsp->scfs_wait) { 328 scfcp = kmalloc(sizeof(*scfcp), GFP_ATOMIC); 329 if (WARN_ON_ONCE(!scfcp)) { 330 atomic_inc(&n_alloc_errs); 331 } else { 332 scfcp->scfc_cpu = -1; 333 scfcp->scfc_wait = scfsp->scfs_wait; 334 scfcp->scfc_out = false; 335 scfcp->scfc_rpc = false; 336 } 337 } 338 switch (scfsp->scfs_prim) { 339 case SCF_PRIM_RESCHED: 340 if (IS_BUILTIN(CONFIG_SCF_TORTURE_TEST)) { 341 cpu = torture_random(trsp) % nr_cpu_ids; 342 scfp->n_resched++; 343 resched_cpu(cpu); 344 this_cpu_inc(scf_invoked_count); 345 } 346 break; 347 case SCF_PRIM_SINGLE: 348 cpu = torture_random(trsp) % nr_cpu_ids; 349 if (scfsp->scfs_wait) 350 scfp->n_single_wait++; 351 else 352 scfp->n_single++; 353 if (scfcp) { 354 scfcp->scfc_cpu = cpu; 355 barrier(); // Prevent race-reduction compiler optimizations. 356 scfcp->scfc_in = true; 357 } 358 ret = smp_call_function_single(cpu, scf_handler_1, (void *)scfcp, scfsp->scfs_wait); 359 if (ret) { 360 if (scfsp->scfs_wait) 361 scfp->n_single_wait_ofl++; 362 else 363 scfp->n_single_ofl++; 364 kfree(scfcp); 365 scfcp = NULL; 366 } 367 break; 368 case SCF_PRIM_SINGLE_RPC: 369 if (!scfcp) 370 break; 371 cpu = torture_random(trsp) % nr_cpu_ids; 372 scfp->n_single_rpc++; 373 scfcp->scfc_cpu = cpu; 374 scfcp->scfc_wait = true; 375 init_completion(&scfcp->scfc_completion); 376 scfcp->scfc_rpc = true; 377 barrier(); // Prevent race-reduction compiler optimizations. 378 scfcp->scfc_in = true; 379 ret = smp_call_function_single(cpu, scf_handler_1, (void *)scfcp, 0); 380 if (!ret) { 381 if (use_cpus_read_lock) 382 cpus_read_unlock(); 383 else 384 preempt_enable(); 385 wait_for_completion(&scfcp->scfc_completion); 386 if (use_cpus_read_lock) 387 cpus_read_lock(); 388 else 389 preempt_disable(); 390 } else { 391 scfp->n_single_rpc_ofl++; 392 kfree(scfcp); 393 scfcp = NULL; 394 } 395 break; 396 case SCF_PRIM_MANY: 397 if (scfsp->scfs_wait) 398 scfp->n_many_wait++; 399 else 400 scfp->n_many++; 401 if (scfcp) { 402 barrier(); // Prevent race-reduction compiler optimizations. 403 scfcp->scfc_in = true; 404 } 405 smp_call_function_many(cpu_online_mask, scf_handler, scfcp, scfsp->scfs_wait); 406 break; 407 case SCF_PRIM_ALL: 408 if (scfsp->scfs_wait) 409 scfp->n_all_wait++; 410 else 411 scfp->n_all++; 412 if (scfcp) { 413 barrier(); // Prevent race-reduction compiler optimizations. 414 scfcp->scfc_in = true; 415 } 416 smp_call_function(scf_handler, scfcp, scfsp->scfs_wait); 417 break; 418 default: 419 WARN_ON_ONCE(1); 420 if (scfcp) 421 scfcp->scfc_out = true; 422 } 423 if (scfcp && scfsp->scfs_wait) { 424 if (WARN_ON_ONCE((num_online_cpus() > 1 || scfsp->scfs_prim == SCF_PRIM_SINGLE) && 425 !scfcp->scfc_out)) { 426 pr_warn("%s: Memory-ordering failure, scfs_prim: %d.\n", __func__, scfsp->scfs_prim); 427 atomic_inc(&n_mb_out_errs); // Leak rather than trash! 428 } else { 429 kfree(scfcp); 430 } 431 barrier(); // Prevent race-reduction compiler optimizations. 432 } 433 if (use_cpus_read_lock) 434 cpus_read_unlock(); 435 else 436 preempt_enable(); 437 if (!(torture_random(trsp) & 0xfff)) 438 schedule_timeout_uninterruptible(1); 439 } 440 441 // SCF test kthread. Repeatedly does calls to members of the 442 // smp_call_function() family of functions. 443 static int scftorture_invoker(void *arg) 444 { 445 int cpu; 446 int curcpu; 447 DEFINE_TORTURE_RANDOM(rand); 448 struct scf_statistics *scfp = (struct scf_statistics *)arg; 449 bool was_offline = false; 450 451 VERBOSE_SCFTORTOUT("scftorture_invoker %d: task started", scfp->cpu); 452 cpu = scfp->cpu % nr_cpu_ids; 453 WARN_ON_ONCE(set_cpus_allowed_ptr(current, cpumask_of(cpu))); 454 set_user_nice(current, MAX_NICE); 455 if (holdoff) 456 schedule_timeout_interruptible(holdoff * HZ); 457 458 VERBOSE_SCFTORTOUT("scftorture_invoker %d: Waiting for all SCF torturers from cpu %d", scfp->cpu, raw_smp_processor_id()); 459 460 // Make sure that the CPU is affinitized appropriately during testing. 461 curcpu = raw_smp_processor_id(); 462 WARN_ONCE(curcpu != scfp->cpu % nr_cpu_ids, 463 "%s: Wanted CPU %d, running on %d, nr_cpu_ids = %d\n", 464 __func__, scfp->cpu, curcpu, nr_cpu_ids); 465 466 if (!atomic_dec_return(&n_started)) 467 while (atomic_read_acquire(&n_started)) { 468 if (torture_must_stop()) { 469 VERBOSE_SCFTORTOUT("scftorture_invoker %d ended before starting", scfp->cpu); 470 goto end; 471 } 472 schedule_timeout_uninterruptible(1); 473 } 474 475 VERBOSE_SCFTORTOUT("scftorture_invoker %d started", scfp->cpu); 476 477 do { 478 scftorture_invoke_one(scfp, &rand); 479 while (cpu_is_offline(cpu) && !torture_must_stop()) { 480 schedule_timeout_interruptible(HZ / 5); 481 was_offline = true; 482 } 483 if (was_offline) { 484 set_cpus_allowed_ptr(current, cpumask_of(cpu)); 485 was_offline = false; 486 } 487 cond_resched(); 488 stutter_wait("scftorture_invoker"); 489 } while (!torture_must_stop()); 490 491 VERBOSE_SCFTORTOUT("scftorture_invoker %d ended", scfp->cpu); 492 end: 493 torture_kthread_stopping("scftorture_invoker"); 494 return 0; 495 } 496 497 static void 498 scftorture_print_module_parms(const char *tag) 499 { 500 pr_alert(SCFTORT_FLAG 501 "--- %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, 502 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); 503 } 504 505 static void scf_cleanup_handler(void *unused) 506 { 507 } 508 509 static void scf_torture_cleanup(void) 510 { 511 int i; 512 513 if (torture_cleanup_begin()) 514 return; 515 516 WRITE_ONCE(scfdone, true); 517 if (nthreads && scf_stats_p) 518 for (i = 0; i < nthreads; i++) 519 torture_stop_kthread("scftorture_invoker", scf_stats_p[i].task); 520 else 521 goto end; 522 smp_call_function(scf_cleanup_handler, NULL, 0); 523 torture_stop_kthread(scf_torture_stats, scf_torture_stats_task); 524 scf_torture_stats_print(); // -After- the stats thread is stopped! 525 kfree(scf_stats_p); // -After- the last stats print has completed! 526 scf_stats_p = NULL; 527 528 if (atomic_read(&n_errs) || atomic_read(&n_mb_in_errs) || atomic_read(&n_mb_out_errs)) 529 scftorture_print_module_parms("End of test: FAILURE"); 530 else if (torture_onoff_failures()) 531 scftorture_print_module_parms("End of test: LOCK_HOTPLUG"); 532 else 533 scftorture_print_module_parms("End of test: SUCCESS"); 534 535 end: 536 torture_cleanup_end(); 537 } 538 539 static int __init scf_torture_init(void) 540 { 541 long i; 542 int firsterr = 0; 543 unsigned long weight_resched1 = weight_resched; 544 unsigned long weight_single1 = weight_single; 545 unsigned long weight_single_rpc1 = weight_single_rpc; 546 unsigned long weight_single_wait1 = weight_single_wait; 547 unsigned long weight_many1 = weight_many; 548 unsigned long weight_many_wait1 = weight_many_wait; 549 unsigned long weight_all1 = weight_all; 550 unsigned long weight_all_wait1 = weight_all_wait; 551 552 if (!torture_init_begin(SCFTORT_STRING, verbose)) 553 return -EBUSY; 554 555 scftorture_print_module_parms("Start of test"); 556 557 if (weight_resched <= 0 && 558 weight_single <= 0 && weight_single_rpc <= 0 && weight_single_wait <= 0 && 559 weight_many <= 0 && weight_many_wait <= 0 && 560 weight_all <= 0 && weight_all_wait <= 0) { 561 weight_resched1 = weight_resched == 0 ? 0 : 2 * nr_cpu_ids; 562 weight_single1 = weight_single == 0 ? 0 : 2 * nr_cpu_ids; 563 weight_single_rpc1 = weight_single_rpc == 0 ? 0 : 2 * nr_cpu_ids; 564 weight_single_wait1 = weight_single_wait == 0 ? 0 : 2 * nr_cpu_ids; 565 weight_many1 = weight_many == 0 ? 0 : 2; 566 weight_many_wait1 = weight_many_wait == 0 ? 0 : 2; 567 weight_all1 = weight_all == 0 ? 0 : 1; 568 weight_all_wait1 = weight_all_wait == 0 ? 0 : 1; 569 } else { 570 if (weight_resched == -1) 571 weight_resched1 = 0; 572 if (weight_single == -1) 573 weight_single1 = 0; 574 if (weight_single_rpc == -1) 575 weight_single_rpc1 = 0; 576 if (weight_single_wait == -1) 577 weight_single_wait1 = 0; 578 if (weight_many == -1) 579 weight_many1 = 0; 580 if (weight_many_wait == -1) 581 weight_many_wait1 = 0; 582 if (weight_all == -1) 583 weight_all1 = 0; 584 if (weight_all_wait == -1) 585 weight_all_wait1 = 0; 586 } 587 if (weight_resched1 == 0 && weight_single1 == 0 && weight_single_rpc1 == 0 && 588 weight_single_wait1 == 0 && weight_many1 == 0 && weight_many_wait1 == 0 && 589 weight_all1 == 0 && weight_all_wait1 == 0) { 590 VERBOSE_SCFTORTOUT_ERRSTRING("all zero weights makes no sense"); 591 firsterr = -EINVAL; 592 goto unwind; 593 } 594 if (IS_BUILTIN(CONFIG_SCF_TORTURE_TEST)) 595 scf_sel_add(weight_resched1, SCF_PRIM_RESCHED, false); 596 else if (weight_resched1) 597 VERBOSE_SCFTORTOUT_ERRSTRING("built as module, weight_resched ignored"); 598 scf_sel_add(weight_single1, SCF_PRIM_SINGLE, false); 599 scf_sel_add(weight_single_rpc1, SCF_PRIM_SINGLE_RPC, true); 600 scf_sel_add(weight_single_wait1, SCF_PRIM_SINGLE, true); 601 scf_sel_add(weight_many1, SCF_PRIM_MANY, false); 602 scf_sel_add(weight_many_wait1, SCF_PRIM_MANY, true); 603 scf_sel_add(weight_all1, SCF_PRIM_ALL, false); 604 scf_sel_add(weight_all_wait1, SCF_PRIM_ALL, true); 605 scf_sel_dump(); 606 607 if (onoff_interval > 0) { 608 firsterr = torture_onoff_init(onoff_holdoff * HZ, onoff_interval, NULL); 609 if (torture_init_error(firsterr)) 610 goto unwind; 611 } 612 if (shutdown_secs > 0) { 613 firsterr = torture_shutdown_init(shutdown_secs, scf_torture_cleanup); 614 if (torture_init_error(firsterr)) 615 goto unwind; 616 } 617 if (stutter > 0) { 618 firsterr = torture_stutter_init(stutter, stutter); 619 if (torture_init_error(firsterr)) 620 goto unwind; 621 } 622 623 // Worker tasks invoking smp_call_function(). 624 if (nthreads < 0) 625 nthreads = num_online_cpus(); 626 scf_stats_p = kcalloc(nthreads, sizeof(scf_stats_p[0]), GFP_KERNEL); 627 if (!scf_stats_p) { 628 VERBOSE_SCFTORTOUT_ERRSTRING("out of memory"); 629 firsterr = -ENOMEM; 630 goto unwind; 631 } 632 633 VERBOSE_SCFTORTOUT("Starting %d smp_call_function() threads\n", nthreads); 634 635 atomic_set(&n_started, nthreads); 636 for (i = 0; i < nthreads; i++) { 637 scf_stats_p[i].cpu = i; 638 firsterr = torture_create_kthread(scftorture_invoker, (void *)&scf_stats_p[i], 639 scf_stats_p[i].task); 640 if (torture_init_error(firsterr)) 641 goto unwind; 642 } 643 if (stat_interval > 0) { 644 firsterr = torture_create_kthread(scf_torture_stats, NULL, scf_torture_stats_task); 645 if (torture_init_error(firsterr)) 646 goto unwind; 647 } 648 649 torture_init_end(); 650 return 0; 651 652 unwind: 653 torture_init_end(); 654 scf_torture_cleanup(); 655 if (shutdown_secs) { 656 WARN_ON(!IS_MODULE(CONFIG_SCF_TORTURE_TEST)); 657 kernel_power_off(); 658 } 659 return firsterr; 660 } 661 662 module_init(scf_torture_init); 663 module_exit(scf_torture_cleanup); 664