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 static DEFINE_PER_CPU(struct llist_head, scf_free_pool); 101 102 // Data for random primitive selection 103 #define SCF_PRIM_RESCHED 0 104 #define SCF_PRIM_SINGLE 1 105 #define SCF_PRIM_SINGLE_RPC 2 106 #define SCF_PRIM_MANY 3 107 #define SCF_PRIM_ALL 4 108 #define SCF_NPRIMS 8 // Need wait and no-wait versions of each, 109 // except for SCF_PRIM_RESCHED and 110 // SCF_PRIM_SINGLE_RPC. 111 112 static char *scf_prim_name[] = { 113 "resched_cpu", 114 "smp_call_function_single", 115 "smp_call_function_single_rpc", 116 "smp_call_function_many", 117 "smp_call_function", 118 }; 119 120 struct scf_selector { 121 unsigned long scfs_weight; 122 int scfs_prim; 123 bool scfs_wait; 124 }; 125 static struct scf_selector scf_sel_array[SCF_NPRIMS]; 126 static int scf_sel_array_len; 127 static unsigned long scf_sel_totweight; 128 129 // Communicate between caller and handler. 130 struct scf_check { 131 bool scfc_in; 132 bool scfc_out; 133 int scfc_cpu; // -1 for not _single(). 134 bool scfc_wait; 135 bool scfc_rpc; 136 struct completion scfc_completion; 137 struct llist_node scf_node; 138 }; 139 140 // Use to wait for all threads to start. 141 static atomic_t n_started; 142 static atomic_t n_errs; 143 static atomic_t n_mb_in_errs; 144 static atomic_t n_mb_out_errs; 145 static atomic_t n_alloc_errs; 146 static bool scfdone; 147 static char *bangstr = ""; 148 149 static DEFINE_TORTURE_RANDOM_PERCPU(scf_torture_rand); 150 151 extern void resched_cpu(int cpu); // An alternative IPI vector. 152 153 static void scf_add_to_free_list(struct scf_check *scfcp) 154 { 155 struct llist_head *pool; 156 unsigned int cpu; 157 158 if (!scfcp) 159 return; 160 cpu = raw_smp_processor_id() % nthreads; 161 pool = &per_cpu(scf_free_pool, cpu); 162 llist_add(&scfcp->scf_node, pool); 163 } 164 165 static void scf_cleanup_free_list(unsigned int cpu) 166 { 167 struct llist_head *pool; 168 struct llist_node *node; 169 struct scf_check *scfcp; 170 171 pool = &per_cpu(scf_free_pool, cpu); 172 node = llist_del_all(pool); 173 while (node) { 174 scfcp = llist_entry(node, struct scf_check, scf_node); 175 node = node->next; 176 kfree(scfcp); 177 } 178 } 179 180 // Print torture statistics. Caller must ensure serialization. 181 static void scf_torture_stats_print(void) 182 { 183 int cpu; 184 int i; 185 long long invoked_count = 0; 186 bool isdone = READ_ONCE(scfdone); 187 struct scf_statistics scfs = {}; 188 189 for_each_possible_cpu(cpu) 190 invoked_count += data_race(per_cpu(scf_invoked_count, cpu)); 191 for (i = 0; i < nthreads; i++) { 192 scfs.n_resched += scf_stats_p[i].n_resched; 193 scfs.n_single += scf_stats_p[i].n_single; 194 scfs.n_single_ofl += scf_stats_p[i].n_single_ofl; 195 scfs.n_single_rpc += scf_stats_p[i].n_single_rpc; 196 scfs.n_single_wait += scf_stats_p[i].n_single_wait; 197 scfs.n_single_wait_ofl += scf_stats_p[i].n_single_wait_ofl; 198 scfs.n_many += scf_stats_p[i].n_many; 199 scfs.n_many_wait += scf_stats_p[i].n_many_wait; 200 scfs.n_all += scf_stats_p[i].n_all; 201 scfs.n_all_wait += scf_stats_p[i].n_all_wait; 202 } 203 if (atomic_read(&n_errs) || atomic_read(&n_mb_in_errs) || 204 atomic_read(&n_mb_out_errs) || 205 (!IS_ENABLED(CONFIG_KASAN) && atomic_read(&n_alloc_errs))) 206 bangstr = "!!! "; 207 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 ", 208 SCFTORT_FLAG, bangstr, isdone ? "VER" : "ver", invoked_count, scfs.n_resched, 209 scfs.n_single, scfs.n_single_wait, scfs.n_single_ofl, scfs.n_single_wait_ofl, 210 scfs.n_single_rpc, scfs.n_single_rpc_ofl, 211 scfs.n_many, scfs.n_many_wait, scfs.n_all, scfs.n_all_wait); 212 torture_onoff_stats(); 213 pr_cont("ste: %d stnmie: %d stnmoe: %d staf: %d\n", atomic_read(&n_errs), 214 atomic_read(&n_mb_in_errs), atomic_read(&n_mb_out_errs), 215 atomic_read(&n_alloc_errs)); 216 } 217 218 // Periodically prints torture statistics, if periodic statistics printing 219 // was specified via the stat_interval module parameter. 220 static int 221 scf_torture_stats(void *arg) 222 { 223 VERBOSE_TOROUT_STRING("scf_torture_stats task started"); 224 do { 225 schedule_timeout_interruptible(stat_interval * HZ); 226 scf_torture_stats_print(); 227 torture_shutdown_absorb("scf_torture_stats"); 228 } while (!torture_must_stop()); 229 torture_kthread_stopping("scf_torture_stats"); 230 return 0; 231 } 232 233 // Add a primitive to the scf_sel_array[]. 234 static void scf_sel_add(unsigned long weight, int prim, bool wait) 235 { 236 struct scf_selector *scfsp = &scf_sel_array[scf_sel_array_len]; 237 238 // If no weight, if array would overflow, if computing three-place 239 // percentages would overflow, or if the scf_prim_name[] array would 240 // overflow, don't bother. In the last three two cases, complain. 241 if (!weight || 242 WARN_ON_ONCE(scf_sel_array_len >= ARRAY_SIZE(scf_sel_array)) || 243 WARN_ON_ONCE(0 - 100000 * weight <= 100000 * scf_sel_totweight) || 244 WARN_ON_ONCE(prim >= ARRAY_SIZE(scf_prim_name))) 245 return; 246 scf_sel_totweight += weight; 247 scfsp->scfs_weight = scf_sel_totweight; 248 scfsp->scfs_prim = prim; 249 scfsp->scfs_wait = wait; 250 scf_sel_array_len++; 251 } 252 253 // Dump out weighting percentages for scf_prim_name[] array. 254 static void scf_sel_dump(void) 255 { 256 int i; 257 unsigned long oldw = 0; 258 struct scf_selector *scfsp; 259 unsigned long w; 260 261 for (i = 0; i < scf_sel_array_len; i++) { 262 scfsp = &scf_sel_array[i]; 263 w = (scfsp->scfs_weight - oldw) * 100000 / scf_sel_totweight; 264 pr_info("%s: %3lu.%03lu %s(%s)\n", __func__, w / 1000, w % 1000, 265 scf_prim_name[scfsp->scfs_prim], 266 scfsp->scfs_wait ? "wait" : "nowait"); 267 oldw = scfsp->scfs_weight; 268 } 269 } 270 271 // Randomly pick a primitive and wait/nowait, based on weightings. 272 static struct scf_selector *scf_sel_rand(struct torture_random_state *trsp) 273 { 274 int i; 275 unsigned long w = torture_random(trsp) % (scf_sel_totweight + 1); 276 277 for (i = 0; i < scf_sel_array_len; i++) 278 if (scf_sel_array[i].scfs_weight >= w) 279 return &scf_sel_array[i]; 280 WARN_ON_ONCE(1); 281 return &scf_sel_array[0]; 282 } 283 284 // Update statistics and occasionally burn up mass quantities of CPU time, 285 // if told to do so via scftorture.longwait. Otherwise, occasionally burn 286 // a little bit. 287 static void scf_handler(void *scfc_in) 288 { 289 int i; 290 int j; 291 unsigned long r = torture_random(this_cpu_ptr(&scf_torture_rand)); 292 struct scf_check *scfcp = scfc_in; 293 294 if (likely(scfcp)) { 295 WRITE_ONCE(scfcp->scfc_out, false); // For multiple receivers. 296 if (WARN_ON_ONCE(unlikely(!READ_ONCE(scfcp->scfc_in)))) 297 atomic_inc(&n_mb_in_errs); 298 } 299 this_cpu_inc(scf_invoked_count); 300 if (longwait <= 0) { 301 if (!(r & 0xffc0)) { 302 udelay(r & 0x3f); 303 goto out; 304 } 305 } 306 if (r & 0xfff) 307 goto out; 308 r = (r >> 12); 309 if (longwait <= 0) { 310 udelay((r & 0xff) + 1); 311 goto out; 312 } 313 r = r % longwait + 1; 314 for (i = 0; i < r; i++) { 315 for (j = 0; j < 1000; j++) { 316 udelay(1000); 317 cpu_relax(); 318 } 319 } 320 out: 321 if (unlikely(!scfcp)) 322 return; 323 if (scfcp->scfc_wait) { 324 WRITE_ONCE(scfcp->scfc_out, true); 325 if (scfcp->scfc_rpc) 326 complete(&scfcp->scfc_completion); 327 } else { 328 scf_add_to_free_list(scfcp); 329 } 330 } 331 332 // As above, but check for correct CPU. 333 static void scf_handler_1(void *scfc_in) 334 { 335 struct scf_check *scfcp = scfc_in; 336 337 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())) { 338 atomic_inc(&n_errs); 339 } 340 scf_handler(scfcp); 341 } 342 343 // Randomly do an smp_call_function*() invocation. 344 static void scftorture_invoke_one(struct scf_statistics *scfp, struct torture_random_state *trsp) 345 { 346 bool allocfail = false; 347 uintptr_t cpu; 348 int ret = 0; 349 struct scf_check *scfcp = NULL; 350 struct scf_selector *scfsp = scf_sel_rand(trsp); 351 352 if (scfsp->scfs_prim == SCF_PRIM_SINGLE || scfsp->scfs_wait) { 353 scfcp = kmalloc(sizeof(*scfcp), GFP_ATOMIC); 354 if (!scfcp) { 355 WARN_ON_ONCE(!IS_ENABLED(CONFIG_KASAN)); 356 atomic_inc(&n_alloc_errs); 357 allocfail = true; 358 } else { 359 scfcp->scfc_cpu = -1; 360 scfcp->scfc_wait = scfsp->scfs_wait; 361 scfcp->scfc_out = false; 362 scfcp->scfc_rpc = false; 363 } 364 } 365 if (use_cpus_read_lock) 366 cpus_read_lock(); 367 else 368 preempt_disable(); 369 switch (scfsp->scfs_prim) { 370 case SCF_PRIM_RESCHED: 371 if (IS_BUILTIN(CONFIG_SCF_TORTURE_TEST)) { 372 cpu = torture_random(trsp) % nr_cpu_ids; 373 scfp->n_resched++; 374 resched_cpu(cpu); 375 this_cpu_inc(scf_invoked_count); 376 } 377 break; 378 case SCF_PRIM_SINGLE: 379 cpu = torture_random(trsp) % nr_cpu_ids; 380 if (scfsp->scfs_wait) 381 scfp->n_single_wait++; 382 else 383 scfp->n_single++; 384 if (scfcp) { 385 scfcp->scfc_cpu = cpu; 386 barrier(); // Prevent race-reduction compiler optimizations. 387 scfcp->scfc_in = true; 388 } 389 ret = smp_call_function_single(cpu, scf_handler_1, (void *)scfcp, scfsp->scfs_wait); 390 if (ret) { 391 if (scfsp->scfs_wait) 392 scfp->n_single_wait_ofl++; 393 else 394 scfp->n_single_ofl++; 395 scf_add_to_free_list(scfcp); 396 scfcp = NULL; 397 } 398 break; 399 case SCF_PRIM_SINGLE_RPC: 400 if (!scfcp) 401 break; 402 cpu = torture_random(trsp) % nr_cpu_ids; 403 scfp->n_single_rpc++; 404 scfcp->scfc_cpu = cpu; 405 scfcp->scfc_wait = true; 406 init_completion(&scfcp->scfc_completion); 407 scfcp->scfc_rpc = true; 408 barrier(); // Prevent race-reduction compiler optimizations. 409 scfcp->scfc_in = true; 410 ret = smp_call_function_single(cpu, scf_handler_1, (void *)scfcp, 0); 411 if (!ret) { 412 if (use_cpus_read_lock) 413 cpus_read_unlock(); 414 else 415 preempt_enable(); 416 wait_for_completion(&scfcp->scfc_completion); 417 if (use_cpus_read_lock) 418 cpus_read_lock(); 419 else 420 preempt_disable(); 421 } else { 422 scfp->n_single_rpc_ofl++; 423 scf_add_to_free_list(scfcp); 424 scfcp = NULL; 425 } 426 break; 427 case SCF_PRIM_MANY: 428 if (scfsp->scfs_wait) 429 scfp->n_many_wait++; 430 else 431 scfp->n_many++; 432 if (scfcp) { 433 barrier(); // Prevent race-reduction compiler optimizations. 434 scfcp->scfc_in = true; 435 } 436 smp_call_function_many(cpu_online_mask, scf_handler, scfcp, scfsp->scfs_wait); 437 break; 438 case SCF_PRIM_ALL: 439 if (scfsp->scfs_wait) 440 scfp->n_all_wait++; 441 else 442 scfp->n_all++; 443 if (scfcp) { 444 barrier(); // Prevent race-reduction compiler optimizations. 445 scfcp->scfc_in = true; 446 } 447 smp_call_function(scf_handler, scfcp, scfsp->scfs_wait); 448 break; 449 default: 450 WARN_ON_ONCE(1); 451 if (scfcp) 452 scfcp->scfc_out = true; 453 } 454 if (scfcp && scfsp->scfs_wait) { 455 if (WARN_ON_ONCE((num_online_cpus() > 1 || scfsp->scfs_prim == SCF_PRIM_SINGLE) && 456 !scfcp->scfc_out)) { 457 pr_warn("%s: Memory-ordering failure, scfs_prim: %d.\n", __func__, scfsp->scfs_prim); 458 atomic_inc(&n_mb_out_errs); // Leak rather than trash! 459 } else { 460 scf_add_to_free_list(scfcp); 461 } 462 barrier(); // Prevent race-reduction compiler optimizations. 463 } 464 if (use_cpus_read_lock) 465 cpus_read_unlock(); 466 else 467 preempt_enable(); 468 if (allocfail) 469 schedule_timeout_idle((1 + longwait) * HZ); // Let no-wait handlers complete. 470 else if (!(torture_random(trsp) & 0xfff)) 471 schedule_timeout_uninterruptible(1); 472 } 473 474 // SCF test kthread. Repeatedly does calls to members of the 475 // smp_call_function() family of functions. 476 static int scftorture_invoker(void *arg) 477 { 478 int cpu; 479 int curcpu; 480 DEFINE_TORTURE_RANDOM(rand); 481 struct scf_statistics *scfp = (struct scf_statistics *)arg; 482 bool was_offline = false; 483 484 VERBOSE_SCFTORTOUT("scftorture_invoker %d: task started", scfp->cpu); 485 cpu = scfp->cpu % nr_cpu_ids; 486 WARN_ON_ONCE(set_cpus_allowed_ptr(current, cpumask_of(cpu))); 487 set_user_nice(current, MAX_NICE); 488 if (holdoff) 489 schedule_timeout_interruptible(holdoff * HZ); 490 491 VERBOSE_SCFTORTOUT("scftorture_invoker %d: Waiting for all SCF torturers from cpu %d", scfp->cpu, raw_smp_processor_id()); 492 493 // Make sure that the CPU is affinitized appropriately during testing. 494 curcpu = raw_smp_processor_id(); 495 WARN_ONCE(curcpu != cpu, 496 "%s: Wanted CPU %d, running on %d, nr_cpu_ids = %d\n", 497 __func__, scfp->cpu, curcpu, nr_cpu_ids); 498 499 if (!atomic_dec_return(&n_started)) 500 while (atomic_read_acquire(&n_started)) { 501 if (torture_must_stop()) { 502 VERBOSE_SCFTORTOUT("scftorture_invoker %d ended before starting", scfp->cpu); 503 goto end; 504 } 505 schedule_timeout_uninterruptible(1); 506 } 507 508 VERBOSE_SCFTORTOUT("scftorture_invoker %d started", scfp->cpu); 509 510 do { 511 scf_cleanup_free_list(cpu); 512 513 scftorture_invoke_one(scfp, &rand); 514 while (cpu_is_offline(cpu) && !torture_must_stop()) { 515 schedule_timeout_interruptible(HZ / 5); 516 was_offline = true; 517 } 518 if (was_offline) { 519 set_cpus_allowed_ptr(current, cpumask_of(cpu)); 520 was_offline = false; 521 } 522 cond_resched(); 523 stutter_wait("scftorture_invoker"); 524 } while (!torture_must_stop()); 525 526 VERBOSE_SCFTORTOUT("scftorture_invoker %d ended", scfp->cpu); 527 end: 528 torture_kthread_stopping("scftorture_invoker"); 529 return 0; 530 } 531 532 static void 533 scftorture_print_module_parms(const char *tag) 534 { 535 pr_alert(SCFTORT_FLAG 536 "--- %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, 537 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); 538 } 539 540 static void scf_cleanup_handler(void *unused) 541 { 542 } 543 544 static void scf_torture_cleanup(void) 545 { 546 int i; 547 548 if (torture_cleanup_begin()) 549 return; 550 551 WRITE_ONCE(scfdone, true); 552 if (nthreads && scf_stats_p) 553 for (i = 0; i < nthreads; i++) 554 torture_stop_kthread("scftorture_invoker", scf_stats_p[i].task); 555 else 556 goto end; 557 smp_call_function(scf_cleanup_handler, NULL, 1); 558 torture_stop_kthread(scf_torture_stats, scf_torture_stats_task); 559 scf_torture_stats_print(); // -After- the stats thread is stopped! 560 kfree(scf_stats_p); // -After- the last stats print has completed! 561 scf_stats_p = NULL; 562 563 for (i = 0; i < nr_cpu_ids; i++) 564 scf_cleanup_free_list(i); 565 566 if (atomic_read(&n_errs) || atomic_read(&n_mb_in_errs) || atomic_read(&n_mb_out_errs)) 567 scftorture_print_module_parms("End of test: FAILURE"); 568 else if (torture_onoff_failures()) 569 scftorture_print_module_parms("End of test: LOCK_HOTPLUG"); 570 else 571 scftorture_print_module_parms("End of test: SUCCESS"); 572 573 end: 574 torture_cleanup_end(); 575 } 576 577 static int __init scf_torture_init(void) 578 { 579 long i; 580 int firsterr = 0; 581 unsigned long weight_resched1 = weight_resched; 582 unsigned long weight_single1 = weight_single; 583 unsigned long weight_single_rpc1 = weight_single_rpc; 584 unsigned long weight_single_wait1 = weight_single_wait; 585 unsigned long weight_many1 = weight_many; 586 unsigned long weight_many_wait1 = weight_many_wait; 587 unsigned long weight_all1 = weight_all; 588 unsigned long weight_all_wait1 = weight_all_wait; 589 590 if (!torture_init_begin(SCFTORT_STRING, verbose)) 591 return -EBUSY; 592 593 scftorture_print_module_parms("Start of test"); 594 595 if (weight_resched <= 0 && 596 weight_single <= 0 && weight_single_rpc <= 0 && weight_single_wait <= 0 && 597 weight_many <= 0 && weight_many_wait <= 0 && 598 weight_all <= 0 && weight_all_wait <= 0) { 599 weight_resched1 = weight_resched == 0 ? 0 : 2 * nr_cpu_ids; 600 weight_single1 = weight_single == 0 ? 0 : 2 * nr_cpu_ids; 601 weight_single_rpc1 = weight_single_rpc == 0 ? 0 : 2 * nr_cpu_ids; 602 weight_single_wait1 = weight_single_wait == 0 ? 0 : 2 * nr_cpu_ids; 603 weight_many1 = weight_many == 0 ? 0 : 2; 604 weight_many_wait1 = weight_many_wait == 0 ? 0 : 2; 605 weight_all1 = weight_all == 0 ? 0 : 1; 606 weight_all_wait1 = weight_all_wait == 0 ? 0 : 1; 607 } else { 608 if (weight_resched == -1) 609 weight_resched1 = 0; 610 if (weight_single == -1) 611 weight_single1 = 0; 612 if (weight_single_rpc == -1) 613 weight_single_rpc1 = 0; 614 if (weight_single_wait == -1) 615 weight_single_wait1 = 0; 616 if (weight_many == -1) 617 weight_many1 = 0; 618 if (weight_many_wait == -1) 619 weight_many_wait1 = 0; 620 if (weight_all == -1) 621 weight_all1 = 0; 622 if (weight_all_wait == -1) 623 weight_all_wait1 = 0; 624 } 625 if (weight_resched1 == 0 && weight_single1 == 0 && weight_single_rpc1 == 0 && 626 weight_single_wait1 == 0 && weight_many1 == 0 && weight_many_wait1 == 0 && 627 weight_all1 == 0 && weight_all_wait1 == 0) { 628 SCFTORTOUT_ERRSTRING("all zero weights makes no sense"); 629 firsterr = -EINVAL; 630 goto unwind; 631 } 632 if (IS_BUILTIN(CONFIG_SCF_TORTURE_TEST)) 633 scf_sel_add(weight_resched1, SCF_PRIM_RESCHED, false); 634 else if (weight_resched1) 635 SCFTORTOUT_ERRSTRING("built as module, weight_resched ignored"); 636 scf_sel_add(weight_single1, SCF_PRIM_SINGLE, false); 637 scf_sel_add(weight_single_rpc1, SCF_PRIM_SINGLE_RPC, true); 638 scf_sel_add(weight_single_wait1, SCF_PRIM_SINGLE, true); 639 scf_sel_add(weight_many1, SCF_PRIM_MANY, false); 640 scf_sel_add(weight_many_wait1, SCF_PRIM_MANY, true); 641 scf_sel_add(weight_all1, SCF_PRIM_ALL, false); 642 scf_sel_add(weight_all_wait1, SCF_PRIM_ALL, true); 643 scf_sel_dump(); 644 645 if (onoff_interval > 0) { 646 firsterr = torture_onoff_init(onoff_holdoff * HZ, onoff_interval, NULL); 647 if (torture_init_error(firsterr)) 648 goto unwind; 649 } 650 if (shutdown_secs > 0) { 651 firsterr = torture_shutdown_init(shutdown_secs, scf_torture_cleanup); 652 if (torture_init_error(firsterr)) 653 goto unwind; 654 } 655 if (stutter > 0) { 656 firsterr = torture_stutter_init(stutter, stutter); 657 if (torture_init_error(firsterr)) 658 goto unwind; 659 } 660 661 // Worker tasks invoking smp_call_function(). 662 if (nthreads < 0) 663 nthreads = num_online_cpus(); 664 scf_stats_p = kcalloc(nthreads, sizeof(scf_stats_p[0]), GFP_KERNEL); 665 if (!scf_stats_p) { 666 SCFTORTOUT_ERRSTRING("out of memory"); 667 firsterr = -ENOMEM; 668 goto unwind; 669 } 670 671 VERBOSE_SCFTORTOUT("Starting %d smp_call_function() threads", nthreads); 672 673 atomic_set(&n_started, nthreads); 674 for (i = 0; i < nthreads; i++) { 675 scf_stats_p[i].cpu = i; 676 firsterr = torture_create_kthread(scftorture_invoker, (void *)&scf_stats_p[i], 677 scf_stats_p[i].task); 678 if (torture_init_error(firsterr)) 679 goto unwind; 680 } 681 if (stat_interval > 0) { 682 firsterr = torture_create_kthread(scf_torture_stats, NULL, scf_torture_stats_task); 683 if (torture_init_error(firsterr)) 684 goto unwind; 685 } 686 687 torture_init_end(); 688 return 0; 689 690 unwind: 691 torture_init_end(); 692 scf_torture_cleanup(); 693 if (shutdown_secs) { 694 WARN_ON(!IS_MODULE(CONFIG_SCF_TORTURE_TEST)); 695 kernel_power_off(); 696 } 697 return firsterr; 698 } 699 700 module_init(scf_torture_init); 701 module_exit(scf_torture_cleanup); 702