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_DESCRIPTION("Torture tests on the smp_call_function() family of primitives"); 47 MODULE_LICENSE("GPL"); 48 MODULE_AUTHOR("Paul E. McKenney <paulmck@kernel.org>"); 49 50 // Wait until there are multiple CPUs before starting test. 51 torture_param(int, holdoff, IS_BUILTIN(CONFIG_SCF_TORTURE_TEST) ? 10 : 0, 52 "Holdoff time before test start (s)"); 53 torture_param(int, longwait, 0, "Include ridiculously long waits? (seconds)"); 54 torture_param(int, nthreads, -1, "# threads, defaults to -1 for all CPUs."); 55 torture_param(int, onoff_holdoff, 0, "Time after boot before CPU hotplugs (s)"); 56 torture_param(int, onoff_interval, 0, "Time between CPU hotplugs (s), 0=disable"); 57 torture_param(int, shutdown_secs, 0, "Shutdown time (ms), <= zero to disable."); 58 torture_param(int, stat_interval, 60, "Number of seconds between stats printk()s."); 59 torture_param(int, stutter, 5, "Number of jiffies to run/halt test, 0=disable"); 60 torture_param(bool, use_cpus_read_lock, 0, "Use cpus_read_lock() to exclude CPU hotplug."); 61 torture_param(int, verbose, 0, "Enable verbose debugging printk()s"); 62 torture_param(int, weight_resched, -1, "Testing weight for resched_cpu() operations."); 63 torture_param(int, weight_single, -1, "Testing weight for single-CPU no-wait operations."); 64 torture_param(int, weight_single_rpc, -1, "Testing weight for single-CPU RPC operations."); 65 torture_param(int, weight_single_wait, -1, "Testing weight for single-CPU operations."); 66 torture_param(int, weight_many, -1, "Testing weight for multi-CPU no-wait operations."); 67 torture_param(int, weight_many_wait, -1, "Testing weight for multi-CPU operations."); 68 torture_param(int, weight_all, -1, "Testing weight for all-CPU no-wait operations."); 69 torture_param(int, weight_all_wait, -1, "Testing weight for all-CPU operations."); 70 71 static char *torture_type = ""; 72 73 #ifdef MODULE 74 # define SCFTORT_SHUTDOWN 0 75 #else 76 # define SCFTORT_SHUTDOWN 1 77 #endif 78 79 torture_param(bool, shutdown, SCFTORT_SHUTDOWN, "Shutdown at end of torture test."); 80 81 struct scf_statistics { 82 struct task_struct *task; 83 int cpu; 84 long long n_resched; 85 long long n_single; 86 long long n_single_ofl; 87 long long n_single_rpc; 88 long long n_single_rpc_ofl; 89 long long n_single_wait; 90 long long n_single_wait_ofl; 91 long long n_many; 92 long long n_many_wait; 93 long long n_all; 94 long long n_all_wait; 95 }; 96 97 static struct scf_statistics *scf_stats_p; 98 static struct task_struct *scf_torture_stats_task; 99 static DEFINE_PER_CPU(long long, scf_invoked_count); 100 101 // Data for random primitive selection 102 #define SCF_PRIM_RESCHED 0 103 #define SCF_PRIM_SINGLE 1 104 #define SCF_PRIM_SINGLE_RPC 2 105 #define SCF_PRIM_MANY 3 106 #define SCF_PRIM_ALL 4 107 #define SCF_NPRIMS 8 // Need wait and no-wait versions of each, 108 // except for SCF_PRIM_RESCHED and 109 // SCF_PRIM_SINGLE_RPC. 110 111 static char *scf_prim_name[] = { 112 "resched_cpu", 113 "smp_call_function_single", 114 "smp_call_function_single_rpc", 115 "smp_call_function_many", 116 "smp_call_function", 117 }; 118 119 struct scf_selector { 120 unsigned long scfs_weight; 121 int scfs_prim; 122 bool scfs_wait; 123 }; 124 static struct scf_selector scf_sel_array[SCF_NPRIMS]; 125 static int scf_sel_array_len; 126 static unsigned long scf_sel_totweight; 127 128 // Communicate between caller and handler. 129 struct scf_check { 130 bool scfc_in; 131 bool scfc_out; 132 int scfc_cpu; // -1 for not _single(). 133 bool scfc_wait; 134 bool scfc_rpc; 135 struct completion scfc_completion; 136 }; 137 138 // Use to wait for all threads to start. 139 static atomic_t n_started; 140 static atomic_t n_errs; 141 static atomic_t n_mb_in_errs; 142 static atomic_t n_mb_out_errs; 143 static atomic_t n_alloc_errs; 144 static bool scfdone; 145 static char *bangstr = ""; 146 147 static DEFINE_TORTURE_RANDOM_PERCPU(scf_torture_rand); 148 149 extern void resched_cpu(int cpu); // An alternative IPI vector. 150 151 // Print torture statistics. Caller must ensure serialization. 152 static void scf_torture_stats_print(void) 153 { 154 int cpu; 155 int i; 156 long long invoked_count = 0; 157 bool isdone = READ_ONCE(scfdone); 158 struct scf_statistics scfs = {}; 159 160 for_each_possible_cpu(cpu) 161 invoked_count += data_race(per_cpu(scf_invoked_count, cpu)); 162 for (i = 0; i < nthreads; i++) { 163 scfs.n_resched += scf_stats_p[i].n_resched; 164 scfs.n_single += scf_stats_p[i].n_single; 165 scfs.n_single_ofl += scf_stats_p[i].n_single_ofl; 166 scfs.n_single_rpc += scf_stats_p[i].n_single_rpc; 167 scfs.n_single_wait += scf_stats_p[i].n_single_wait; 168 scfs.n_single_wait_ofl += scf_stats_p[i].n_single_wait_ofl; 169 scfs.n_many += scf_stats_p[i].n_many; 170 scfs.n_many_wait += scf_stats_p[i].n_many_wait; 171 scfs.n_all += scf_stats_p[i].n_all; 172 scfs.n_all_wait += scf_stats_p[i].n_all_wait; 173 } 174 if (atomic_read(&n_errs) || atomic_read(&n_mb_in_errs) || 175 atomic_read(&n_mb_out_errs) || 176 (!IS_ENABLED(CONFIG_KASAN) && atomic_read(&n_alloc_errs))) 177 bangstr = "!!! "; 178 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 ", 179 SCFTORT_FLAG, bangstr, isdone ? "VER" : "ver", invoked_count, scfs.n_resched, 180 scfs.n_single, scfs.n_single_wait, scfs.n_single_ofl, scfs.n_single_wait_ofl, 181 scfs.n_single_rpc, scfs.n_single_rpc_ofl, 182 scfs.n_many, scfs.n_many_wait, scfs.n_all, scfs.n_all_wait); 183 torture_onoff_stats(); 184 pr_cont("ste: %d stnmie: %d stnmoe: %d staf: %d\n", atomic_read(&n_errs), 185 atomic_read(&n_mb_in_errs), atomic_read(&n_mb_out_errs), 186 atomic_read(&n_alloc_errs)); 187 } 188 189 // Periodically prints torture statistics, if periodic statistics printing 190 // was specified via the stat_interval module parameter. 191 static int 192 scf_torture_stats(void *arg) 193 { 194 VERBOSE_TOROUT_STRING("scf_torture_stats task started"); 195 do { 196 schedule_timeout_interruptible(stat_interval * HZ); 197 scf_torture_stats_print(); 198 torture_shutdown_absorb("scf_torture_stats"); 199 } while (!torture_must_stop()); 200 torture_kthread_stopping("scf_torture_stats"); 201 return 0; 202 } 203 204 // Add a primitive to the scf_sel_array[]. 205 static void scf_sel_add(unsigned long weight, int prim, bool wait) 206 { 207 struct scf_selector *scfsp = &scf_sel_array[scf_sel_array_len]; 208 209 // If no weight, if array would overflow, if computing three-place 210 // percentages would overflow, or if the scf_prim_name[] array would 211 // overflow, don't bother. In the last three two cases, complain. 212 if (!weight || 213 WARN_ON_ONCE(scf_sel_array_len >= ARRAY_SIZE(scf_sel_array)) || 214 WARN_ON_ONCE(0 - 100000 * weight <= 100000 * scf_sel_totweight) || 215 WARN_ON_ONCE(prim >= ARRAY_SIZE(scf_prim_name))) 216 return; 217 scf_sel_totweight += weight; 218 scfsp->scfs_weight = scf_sel_totweight; 219 scfsp->scfs_prim = prim; 220 scfsp->scfs_wait = wait; 221 scf_sel_array_len++; 222 } 223 224 // Dump out weighting percentages for scf_prim_name[] array. 225 static void scf_sel_dump(void) 226 { 227 int i; 228 unsigned long oldw = 0; 229 struct scf_selector *scfsp; 230 unsigned long w; 231 232 for (i = 0; i < scf_sel_array_len; i++) { 233 scfsp = &scf_sel_array[i]; 234 w = (scfsp->scfs_weight - oldw) * 100000 / scf_sel_totweight; 235 pr_info("%s: %3lu.%03lu %s(%s)\n", __func__, w / 1000, w % 1000, 236 scf_prim_name[scfsp->scfs_prim], 237 scfsp->scfs_wait ? "wait" : "nowait"); 238 oldw = scfsp->scfs_weight; 239 } 240 } 241 242 // Randomly pick a primitive and wait/nowait, based on weightings. 243 static struct scf_selector *scf_sel_rand(struct torture_random_state *trsp) 244 { 245 int i; 246 unsigned long w = torture_random(trsp) % (scf_sel_totweight + 1); 247 248 for (i = 0; i < scf_sel_array_len; i++) 249 if (scf_sel_array[i].scfs_weight >= w) 250 return &scf_sel_array[i]; 251 WARN_ON_ONCE(1); 252 return &scf_sel_array[0]; 253 } 254 255 // Update statistics and occasionally burn up mass quantities of CPU time, 256 // if told to do so via scftorture.longwait. Otherwise, occasionally burn 257 // a little bit. 258 static void scf_handler(void *scfc_in) 259 { 260 int i; 261 int j; 262 unsigned long r = torture_random(this_cpu_ptr(&scf_torture_rand)); 263 struct scf_check *scfcp = scfc_in; 264 265 if (likely(scfcp)) { 266 WRITE_ONCE(scfcp->scfc_out, false); // For multiple receivers. 267 if (WARN_ON_ONCE(unlikely(!READ_ONCE(scfcp->scfc_in)))) 268 atomic_inc(&n_mb_in_errs); 269 } 270 this_cpu_inc(scf_invoked_count); 271 if (longwait <= 0) { 272 if (!(r & 0xffc0)) { 273 udelay(r & 0x3f); 274 goto out; 275 } 276 } 277 if (r & 0xfff) 278 goto out; 279 r = (r >> 12); 280 if (longwait <= 0) { 281 udelay((r & 0xff) + 1); 282 goto out; 283 } 284 r = r % longwait + 1; 285 for (i = 0; i < r; i++) { 286 for (j = 0; j < 1000; j++) { 287 udelay(1000); 288 cpu_relax(); 289 } 290 } 291 out: 292 if (unlikely(!scfcp)) 293 return; 294 if (scfcp->scfc_wait) { 295 WRITE_ONCE(scfcp->scfc_out, true); 296 if (scfcp->scfc_rpc) 297 complete(&scfcp->scfc_completion); 298 } else { 299 kfree(scfcp); 300 } 301 } 302 303 // As above, but check for correct CPU. 304 static void scf_handler_1(void *scfc_in) 305 { 306 struct scf_check *scfcp = scfc_in; 307 308 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())) { 309 atomic_inc(&n_errs); 310 } 311 scf_handler(scfcp); 312 } 313 314 // Randomly do an smp_call_function*() invocation. 315 static void scftorture_invoke_one(struct scf_statistics *scfp, struct torture_random_state *trsp) 316 { 317 bool allocfail = false; 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 (!scfcp) { 330 WARN_ON_ONCE(!IS_ENABLED(CONFIG_KASAN)); 331 atomic_inc(&n_alloc_errs); 332 allocfail = true; 333 } else { 334 scfcp->scfc_cpu = -1; 335 scfcp->scfc_wait = scfsp->scfs_wait; 336 scfcp->scfc_out = false; 337 scfcp->scfc_rpc = false; 338 } 339 } 340 switch (scfsp->scfs_prim) { 341 case SCF_PRIM_RESCHED: 342 if (IS_BUILTIN(CONFIG_SCF_TORTURE_TEST)) { 343 cpu = torture_random(trsp) % nr_cpu_ids; 344 scfp->n_resched++; 345 resched_cpu(cpu); 346 this_cpu_inc(scf_invoked_count); 347 } 348 break; 349 case SCF_PRIM_SINGLE: 350 cpu = torture_random(trsp) % nr_cpu_ids; 351 if (scfsp->scfs_wait) 352 scfp->n_single_wait++; 353 else 354 scfp->n_single++; 355 if (scfcp) { 356 scfcp->scfc_cpu = cpu; 357 barrier(); // Prevent race-reduction compiler optimizations. 358 scfcp->scfc_in = true; 359 } 360 ret = smp_call_function_single(cpu, scf_handler_1, (void *)scfcp, scfsp->scfs_wait); 361 if (ret) { 362 if (scfsp->scfs_wait) 363 scfp->n_single_wait_ofl++; 364 else 365 scfp->n_single_ofl++; 366 kfree(scfcp); 367 scfcp = NULL; 368 } 369 break; 370 case SCF_PRIM_SINGLE_RPC: 371 if (!scfcp) 372 break; 373 cpu = torture_random(trsp) % nr_cpu_ids; 374 scfp->n_single_rpc++; 375 scfcp->scfc_cpu = cpu; 376 scfcp->scfc_wait = true; 377 init_completion(&scfcp->scfc_completion); 378 scfcp->scfc_rpc = true; 379 barrier(); // Prevent race-reduction compiler optimizations. 380 scfcp->scfc_in = true; 381 ret = smp_call_function_single(cpu, scf_handler_1, (void *)scfcp, 0); 382 if (!ret) { 383 if (use_cpus_read_lock) 384 cpus_read_unlock(); 385 else 386 preempt_enable(); 387 wait_for_completion(&scfcp->scfc_completion); 388 if (use_cpus_read_lock) 389 cpus_read_lock(); 390 else 391 preempt_disable(); 392 } else { 393 scfp->n_single_rpc_ofl++; 394 kfree(scfcp); 395 scfcp = NULL; 396 } 397 break; 398 case SCF_PRIM_MANY: 399 if (scfsp->scfs_wait) 400 scfp->n_many_wait++; 401 else 402 scfp->n_many++; 403 if (scfcp) { 404 barrier(); // Prevent race-reduction compiler optimizations. 405 scfcp->scfc_in = true; 406 } 407 smp_call_function_many(cpu_online_mask, scf_handler, scfcp, scfsp->scfs_wait); 408 break; 409 case SCF_PRIM_ALL: 410 if (scfsp->scfs_wait) 411 scfp->n_all_wait++; 412 else 413 scfp->n_all++; 414 if (scfcp) { 415 barrier(); // Prevent race-reduction compiler optimizations. 416 scfcp->scfc_in = true; 417 } 418 smp_call_function(scf_handler, scfcp, scfsp->scfs_wait); 419 break; 420 default: 421 WARN_ON_ONCE(1); 422 if (scfcp) 423 scfcp->scfc_out = true; 424 } 425 if (scfcp && scfsp->scfs_wait) { 426 if (WARN_ON_ONCE((num_online_cpus() > 1 || scfsp->scfs_prim == SCF_PRIM_SINGLE) && 427 !scfcp->scfc_out)) { 428 pr_warn("%s: Memory-ordering failure, scfs_prim: %d.\n", __func__, scfsp->scfs_prim); 429 atomic_inc(&n_mb_out_errs); // Leak rather than trash! 430 } else { 431 kfree(scfcp); 432 } 433 barrier(); // Prevent race-reduction compiler optimizations. 434 } 435 if (use_cpus_read_lock) 436 cpus_read_unlock(); 437 else 438 preempt_enable(); 439 if (allocfail) 440 schedule_timeout_idle((1 + longwait) * HZ); // Let no-wait handlers complete. 441 else if (!(torture_random(trsp) & 0xfff)) 442 schedule_timeout_uninterruptible(1); 443 } 444 445 // SCF test kthread. Repeatedly does calls to members of the 446 // smp_call_function() family of functions. 447 static int scftorture_invoker(void *arg) 448 { 449 int cpu; 450 int curcpu; 451 DEFINE_TORTURE_RANDOM(rand); 452 struct scf_statistics *scfp = (struct scf_statistics *)arg; 453 bool was_offline = false; 454 455 VERBOSE_SCFTORTOUT("scftorture_invoker %d: task started", scfp->cpu); 456 cpu = scfp->cpu % nr_cpu_ids; 457 WARN_ON_ONCE(set_cpus_allowed_ptr(current, cpumask_of(cpu))); 458 set_user_nice(current, MAX_NICE); 459 if (holdoff) 460 schedule_timeout_interruptible(holdoff * HZ); 461 462 VERBOSE_SCFTORTOUT("scftorture_invoker %d: Waiting for all SCF torturers from cpu %d", scfp->cpu, raw_smp_processor_id()); 463 464 // Make sure that the CPU is affinitized appropriately during testing. 465 curcpu = raw_smp_processor_id(); 466 WARN_ONCE(curcpu != scfp->cpu % nr_cpu_ids, 467 "%s: Wanted CPU %d, running on %d, nr_cpu_ids = %d\n", 468 __func__, scfp->cpu, curcpu, nr_cpu_ids); 469 470 if (!atomic_dec_return(&n_started)) 471 while (atomic_read_acquire(&n_started)) { 472 if (torture_must_stop()) { 473 VERBOSE_SCFTORTOUT("scftorture_invoker %d ended before starting", scfp->cpu); 474 goto end; 475 } 476 schedule_timeout_uninterruptible(1); 477 } 478 479 VERBOSE_SCFTORTOUT("scftorture_invoker %d started", scfp->cpu); 480 481 do { 482 scftorture_invoke_one(scfp, &rand); 483 while (cpu_is_offline(cpu) && !torture_must_stop()) { 484 schedule_timeout_interruptible(HZ / 5); 485 was_offline = true; 486 } 487 if (was_offline) { 488 set_cpus_allowed_ptr(current, cpumask_of(cpu)); 489 was_offline = false; 490 } 491 cond_resched(); 492 stutter_wait("scftorture_invoker"); 493 } while (!torture_must_stop()); 494 495 VERBOSE_SCFTORTOUT("scftorture_invoker %d ended", scfp->cpu); 496 end: 497 torture_kthread_stopping("scftorture_invoker"); 498 return 0; 499 } 500 501 static void 502 scftorture_print_module_parms(const char *tag) 503 { 504 pr_alert(SCFTORT_FLAG 505 "--- %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, 506 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); 507 } 508 509 static void scf_cleanup_handler(void *unused) 510 { 511 } 512 513 static void scf_torture_cleanup(void) 514 { 515 int i; 516 517 if (torture_cleanup_begin()) 518 return; 519 520 WRITE_ONCE(scfdone, true); 521 if (nthreads && scf_stats_p) 522 for (i = 0; i < nthreads; i++) 523 torture_stop_kthread("scftorture_invoker", scf_stats_p[i].task); 524 else 525 goto end; 526 smp_call_function(scf_cleanup_handler, NULL, 0); 527 torture_stop_kthread(scf_torture_stats, scf_torture_stats_task); 528 scf_torture_stats_print(); // -After- the stats thread is stopped! 529 kfree(scf_stats_p); // -After- the last stats print has completed! 530 scf_stats_p = NULL; 531 532 if (atomic_read(&n_errs) || atomic_read(&n_mb_in_errs) || atomic_read(&n_mb_out_errs)) 533 scftorture_print_module_parms("End of test: FAILURE"); 534 else if (torture_onoff_failures()) 535 scftorture_print_module_parms("End of test: LOCK_HOTPLUG"); 536 else 537 scftorture_print_module_parms("End of test: SUCCESS"); 538 539 end: 540 torture_cleanup_end(); 541 } 542 543 static int __init scf_torture_init(void) 544 { 545 long i; 546 int firsterr = 0; 547 unsigned long weight_resched1 = weight_resched; 548 unsigned long weight_single1 = weight_single; 549 unsigned long weight_single_rpc1 = weight_single_rpc; 550 unsigned long weight_single_wait1 = weight_single_wait; 551 unsigned long weight_many1 = weight_many; 552 unsigned long weight_many_wait1 = weight_many_wait; 553 unsigned long weight_all1 = weight_all; 554 unsigned long weight_all_wait1 = weight_all_wait; 555 556 if (!torture_init_begin(SCFTORT_STRING, verbose)) 557 return -EBUSY; 558 559 scftorture_print_module_parms("Start of test"); 560 561 if (weight_resched <= 0 && 562 weight_single <= 0 && weight_single_rpc <= 0 && weight_single_wait <= 0 && 563 weight_many <= 0 && weight_many_wait <= 0 && 564 weight_all <= 0 && weight_all_wait <= 0) { 565 weight_resched1 = weight_resched == 0 ? 0 : 2 * nr_cpu_ids; 566 weight_single1 = weight_single == 0 ? 0 : 2 * nr_cpu_ids; 567 weight_single_rpc1 = weight_single_rpc == 0 ? 0 : 2 * nr_cpu_ids; 568 weight_single_wait1 = weight_single_wait == 0 ? 0 : 2 * nr_cpu_ids; 569 weight_many1 = weight_many == 0 ? 0 : 2; 570 weight_many_wait1 = weight_many_wait == 0 ? 0 : 2; 571 weight_all1 = weight_all == 0 ? 0 : 1; 572 weight_all_wait1 = weight_all_wait == 0 ? 0 : 1; 573 } else { 574 if (weight_resched == -1) 575 weight_resched1 = 0; 576 if (weight_single == -1) 577 weight_single1 = 0; 578 if (weight_single_rpc == -1) 579 weight_single_rpc1 = 0; 580 if (weight_single_wait == -1) 581 weight_single_wait1 = 0; 582 if (weight_many == -1) 583 weight_many1 = 0; 584 if (weight_many_wait == -1) 585 weight_many_wait1 = 0; 586 if (weight_all == -1) 587 weight_all1 = 0; 588 if (weight_all_wait == -1) 589 weight_all_wait1 = 0; 590 } 591 if (weight_resched1 == 0 && weight_single1 == 0 && weight_single_rpc1 == 0 && 592 weight_single_wait1 == 0 && weight_many1 == 0 && weight_many_wait1 == 0 && 593 weight_all1 == 0 && weight_all_wait1 == 0) { 594 SCFTORTOUT_ERRSTRING("all zero weights makes no sense"); 595 firsterr = -EINVAL; 596 goto unwind; 597 } 598 if (IS_BUILTIN(CONFIG_SCF_TORTURE_TEST)) 599 scf_sel_add(weight_resched1, SCF_PRIM_RESCHED, false); 600 else if (weight_resched1) 601 SCFTORTOUT_ERRSTRING("built as module, weight_resched ignored"); 602 scf_sel_add(weight_single1, SCF_PRIM_SINGLE, false); 603 scf_sel_add(weight_single_rpc1, SCF_PRIM_SINGLE_RPC, true); 604 scf_sel_add(weight_single_wait1, SCF_PRIM_SINGLE, true); 605 scf_sel_add(weight_many1, SCF_PRIM_MANY, false); 606 scf_sel_add(weight_many_wait1, SCF_PRIM_MANY, true); 607 scf_sel_add(weight_all1, SCF_PRIM_ALL, false); 608 scf_sel_add(weight_all_wait1, SCF_PRIM_ALL, true); 609 scf_sel_dump(); 610 611 if (onoff_interval > 0) { 612 firsterr = torture_onoff_init(onoff_holdoff * HZ, onoff_interval, NULL); 613 if (torture_init_error(firsterr)) 614 goto unwind; 615 } 616 if (shutdown_secs > 0) { 617 firsterr = torture_shutdown_init(shutdown_secs, scf_torture_cleanup); 618 if (torture_init_error(firsterr)) 619 goto unwind; 620 } 621 if (stutter > 0) { 622 firsterr = torture_stutter_init(stutter, stutter); 623 if (torture_init_error(firsterr)) 624 goto unwind; 625 } 626 627 // Worker tasks invoking smp_call_function(). 628 if (nthreads < 0) 629 nthreads = num_online_cpus(); 630 scf_stats_p = kcalloc(nthreads, sizeof(scf_stats_p[0]), GFP_KERNEL); 631 if (!scf_stats_p) { 632 SCFTORTOUT_ERRSTRING("out of memory"); 633 firsterr = -ENOMEM; 634 goto unwind; 635 } 636 637 VERBOSE_SCFTORTOUT("Starting %d smp_call_function() threads", nthreads); 638 639 atomic_set(&n_started, nthreads); 640 for (i = 0; i < nthreads; i++) { 641 scf_stats_p[i].cpu = i; 642 firsterr = torture_create_kthread(scftorture_invoker, (void *)&scf_stats_p[i], 643 scf_stats_p[i].task); 644 if (torture_init_error(firsterr)) 645 goto unwind; 646 } 647 if (stat_interval > 0) { 648 firsterr = torture_create_kthread(scf_torture_stats, NULL, scf_torture_stats_task); 649 if (torture_init_error(firsterr)) 650 goto unwind; 651 } 652 653 torture_init_end(); 654 return 0; 655 656 unwind: 657 torture_init_end(); 658 scf_torture_cleanup(); 659 if (shutdown_secs) { 660 WARN_ON(!IS_MODULE(CONFIG_SCF_TORTURE_TEST)); 661 kernel_power_off(); 662 } 663 return firsterr; 664 } 665 666 module_init(scf_torture_init); 667 module_exit(scf_torture_cleanup); 668