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