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 bool is_single = (scfsp->scfs_prim == SCF_PRIM_SINGLE || 352 scfsp->scfs_prim == SCF_PRIM_SINGLE_RPC); 353 354 if (scfsp->scfs_prim == SCF_PRIM_SINGLE || scfsp->scfs_wait) { 355 scfcp = kmalloc_obj(*scfcp, GFP_ATOMIC); 356 if (!scfcp) { 357 WARN_ON_ONCE(!IS_ENABLED(CONFIG_KASAN)); 358 atomic_inc(&n_alloc_errs); 359 allocfail = true; 360 } else { 361 scfcp->scfc_cpu = -1; 362 scfcp->scfc_wait = scfsp->scfs_wait; 363 scfcp->scfc_out = false; 364 scfcp->scfc_rpc = false; 365 } 366 } 367 if (use_cpus_read_lock) 368 cpus_read_lock(); 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(); 414 415 wait_for_completion(&scfcp->scfc_completion); 416 if (use_cpus_read_lock) 417 cpus_read_lock(); 418 } else { 419 scfp->n_single_rpc_ofl++; 420 scf_add_to_free_list(scfcp); 421 scfcp = NULL; 422 } 423 break; 424 case SCF_PRIM_MANY: 425 if (scfsp->scfs_wait) 426 scfp->n_many_wait++; 427 else 428 scfp->n_many++; 429 if (scfcp) { 430 barrier(); // Prevent race-reduction compiler optimizations. 431 scfcp->scfc_in = true; 432 } 433 smp_call_function_many(cpu_online_mask, scf_handler, scfcp, scfsp->scfs_wait); 434 break; 435 case SCF_PRIM_ALL: 436 if (scfsp->scfs_wait) 437 scfp->n_all_wait++; 438 else 439 scfp->n_all++; 440 if (scfcp) { 441 barrier(); // Prevent race-reduction compiler optimizations. 442 scfcp->scfc_in = true; 443 } 444 smp_call_function(scf_handler, scfcp, scfsp->scfs_wait); 445 break; 446 default: 447 WARN_ON_ONCE(1); 448 if (scfcp) 449 scfcp->scfc_out = true; 450 } 451 if (scfcp && scfsp->scfs_wait) { 452 if (WARN_ON_ONCE(((use_cpus_read_lock && num_online_cpus() > 1) || is_single) && 453 !scfcp->scfc_out)) { 454 pr_warn("%s: Memory-ordering failure, scfs_prim: %d.\n", __func__, scfsp->scfs_prim); 455 atomic_inc(&n_mb_out_errs); // Leak rather than trash! 456 } else { 457 scf_add_to_free_list(scfcp); 458 } 459 barrier(); // Prevent race-reduction compiler optimizations. 460 } 461 if (use_cpus_read_lock) 462 cpus_read_unlock(); 463 if (allocfail) 464 schedule_timeout_idle((1 + longwait) * HZ); // Let no-wait handlers complete. 465 else if (!(torture_random(trsp) & 0xfff)) 466 schedule_timeout_uninterruptible(1); 467 } 468 469 // SCF test kthread. Repeatedly does calls to members of the 470 // smp_call_function() family of functions. 471 static int scftorture_invoker(void *arg) 472 { 473 int cpu; 474 int curcpu; 475 DEFINE_TORTURE_RANDOM(rand); 476 struct scf_statistics *scfp = (struct scf_statistics *)arg; 477 bool was_offline = false; 478 479 VERBOSE_SCFTORTOUT("scftorture_invoker %d: task started", scfp->cpu); 480 cpu = scfp->cpu % nr_cpu_ids; 481 WARN_ON_ONCE(set_cpus_allowed_ptr(current, cpumask_of(cpu))); 482 set_user_nice(current, MAX_NICE); 483 if (holdoff) 484 schedule_timeout_interruptible(holdoff * HZ); 485 486 VERBOSE_SCFTORTOUT("scftorture_invoker %d: Waiting for all SCF torturers from cpu %d", scfp->cpu, raw_smp_processor_id()); 487 488 // Make sure that the CPU is affinitized appropriately during testing. 489 curcpu = raw_smp_processor_id(); 490 WARN_ONCE(curcpu != cpu, 491 "%s: Wanted CPU %d, running on %d, nr_cpu_ids = %d\n", 492 __func__, scfp->cpu, curcpu, nr_cpu_ids); 493 494 if (!atomic_dec_return(&n_started)) 495 while (atomic_read_acquire(&n_started)) { 496 if (torture_must_stop()) { 497 VERBOSE_SCFTORTOUT("scftorture_invoker %d ended before starting", scfp->cpu); 498 goto end; 499 } 500 schedule_timeout_uninterruptible(1); 501 } 502 503 VERBOSE_SCFTORTOUT("scftorture_invoker %d started", scfp->cpu); 504 505 do { 506 scf_cleanup_free_list(cpu); 507 508 scftorture_invoke_one(scfp, &rand); 509 while (cpu_is_offline(cpu) && !torture_must_stop()) { 510 schedule_timeout_interruptible(HZ / 5); 511 was_offline = true; 512 } 513 if (was_offline) { 514 set_cpus_allowed_ptr(current, cpumask_of(cpu)); 515 was_offline = false; 516 } 517 cond_resched(); 518 stutter_wait("scftorture_invoker"); 519 } while (!torture_must_stop()); 520 521 VERBOSE_SCFTORTOUT("scftorture_invoker %d ended", scfp->cpu); 522 end: 523 torture_kthread_stopping("scftorture_invoker"); 524 return 0; 525 } 526 527 static void 528 scftorture_print_module_parms(const char *tag) 529 { 530 pr_alert(SCFTORT_FLAG 531 "--- %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, 532 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); 533 } 534 535 static void scf_cleanup_handler(void *unused) 536 { 537 } 538 539 static void scf_torture_cleanup(void) 540 { 541 int i; 542 543 if (torture_cleanup_begin()) 544 return; 545 546 WRITE_ONCE(scfdone, true); 547 if (nthreads && scf_stats_p) 548 for (i = 0; i < nthreads; i++) 549 torture_stop_kthread("scftorture_invoker", scf_stats_p[i].task); 550 else 551 goto end; 552 smp_call_function(scf_cleanup_handler, NULL, 1); 553 torture_stop_kthread(scf_torture_stats, scf_torture_stats_task); 554 scf_torture_stats_print(); // -After- the stats thread is stopped! 555 kfree(scf_stats_p); // -After- the last stats print has completed! 556 scf_stats_p = NULL; 557 558 for (i = 0; i < nr_cpu_ids; i++) 559 scf_cleanup_free_list(i); 560 561 if (atomic_read(&n_errs) || atomic_read(&n_mb_in_errs) || atomic_read(&n_mb_out_errs)) 562 scftorture_print_module_parms("End of test: FAILURE"); 563 else if (torture_onoff_failures()) 564 scftorture_print_module_parms("End of test: LOCK_HOTPLUG"); 565 else 566 scftorture_print_module_parms("End of test: SUCCESS"); 567 568 end: 569 torture_cleanup_end(); 570 } 571 572 static int __init scf_torture_init(void) 573 { 574 long i; 575 int firsterr = 0; 576 unsigned long weight_resched1 = weight_resched; 577 unsigned long weight_single1 = weight_single; 578 unsigned long weight_single_rpc1 = weight_single_rpc; 579 unsigned long weight_single_wait1 = weight_single_wait; 580 unsigned long weight_many1 = weight_many; 581 unsigned long weight_many_wait1 = weight_many_wait; 582 unsigned long weight_all1 = weight_all; 583 unsigned long weight_all_wait1 = weight_all_wait; 584 585 if (!torture_init_begin(SCFTORT_STRING, verbose)) 586 return -EBUSY; 587 588 scftorture_print_module_parms("Start of test"); 589 590 if (weight_resched <= 0 && 591 weight_single <= 0 && weight_single_rpc <= 0 && weight_single_wait <= 0 && 592 weight_many <= 0 && weight_many_wait <= 0 && 593 weight_all <= 0 && weight_all_wait <= 0) { 594 weight_resched1 = weight_resched == 0 ? 0 : 2 * nr_cpu_ids; 595 weight_single1 = weight_single == 0 ? 0 : 2 * nr_cpu_ids; 596 weight_single_rpc1 = weight_single_rpc == 0 ? 0 : 2 * nr_cpu_ids; 597 weight_single_wait1 = weight_single_wait == 0 ? 0 : 2 * nr_cpu_ids; 598 weight_many1 = weight_many == 0 ? 0 : 2; 599 weight_many_wait1 = weight_many_wait == 0 ? 0 : 2; 600 weight_all1 = weight_all == 0 ? 0 : 1; 601 weight_all_wait1 = weight_all_wait == 0 ? 0 : 1; 602 } else { 603 if (weight_resched == -1) 604 weight_resched1 = 0; 605 if (weight_single == -1) 606 weight_single1 = 0; 607 if (weight_single_rpc == -1) 608 weight_single_rpc1 = 0; 609 if (weight_single_wait == -1) 610 weight_single_wait1 = 0; 611 if (weight_many == -1) 612 weight_many1 = 0; 613 if (weight_many_wait == -1) 614 weight_many_wait1 = 0; 615 if (weight_all == -1) 616 weight_all1 = 0; 617 if (weight_all_wait == -1) 618 weight_all_wait1 = 0; 619 } 620 if (weight_resched1 == 0 && weight_single1 == 0 && weight_single_rpc1 == 0 && 621 weight_single_wait1 == 0 && weight_many1 == 0 && weight_many_wait1 == 0 && 622 weight_all1 == 0 && weight_all_wait1 == 0) { 623 SCFTORTOUT_ERRSTRING("all zero weights makes no sense"); 624 firsterr = -EINVAL; 625 goto unwind; 626 } 627 if (IS_BUILTIN(CONFIG_SCF_TORTURE_TEST)) 628 scf_sel_add(weight_resched1, SCF_PRIM_RESCHED, false); 629 else if (weight_resched1) 630 SCFTORTOUT_ERRSTRING("built as module, weight_resched ignored"); 631 scf_sel_add(weight_single1, SCF_PRIM_SINGLE, false); 632 scf_sel_add(weight_single_rpc1, SCF_PRIM_SINGLE_RPC, true); 633 scf_sel_add(weight_single_wait1, SCF_PRIM_SINGLE, true); 634 scf_sel_add(weight_many1, SCF_PRIM_MANY, false); 635 scf_sel_add(weight_many_wait1, SCF_PRIM_MANY, true); 636 scf_sel_add(weight_all1, SCF_PRIM_ALL, false); 637 scf_sel_add(weight_all_wait1, SCF_PRIM_ALL, true); 638 scf_sel_dump(); 639 640 if (onoff_interval > 0) { 641 firsterr = torture_onoff_init(onoff_holdoff * HZ, onoff_interval, NULL); 642 if (torture_init_error(firsterr)) 643 goto unwind; 644 } 645 if (shutdown_secs > 0) { 646 firsterr = torture_shutdown_init(shutdown_secs, scf_torture_cleanup); 647 if (torture_init_error(firsterr)) 648 goto unwind; 649 } 650 if (stutter > 0) { 651 firsterr = torture_stutter_init(stutter, stutter); 652 if (torture_init_error(firsterr)) 653 goto unwind; 654 } 655 656 // Worker tasks invoking smp_call_function(). 657 if (nthreads < 0) 658 nthreads = num_online_cpus(); 659 scf_stats_p = kzalloc_objs(scf_stats_p[0], nthreads); 660 if (!scf_stats_p) { 661 SCFTORTOUT_ERRSTRING("out of memory"); 662 firsterr = -ENOMEM; 663 goto unwind; 664 } 665 666 VERBOSE_SCFTORTOUT("Starting %d smp_call_function() threads", nthreads); 667 668 atomic_set(&n_started, nthreads); 669 for (i = 0; i < nthreads; i++) { 670 scf_stats_p[i].cpu = i; 671 firsterr = torture_create_kthread(scftorture_invoker, (void *)&scf_stats_p[i], 672 scf_stats_p[i].task); 673 if (torture_init_error(firsterr)) 674 goto unwind; 675 } 676 if (stat_interval > 0) { 677 firsterr = torture_create_kthread(scf_torture_stats, NULL, scf_torture_stats_task); 678 if (torture_init_error(firsterr)) 679 goto unwind; 680 } 681 682 torture_init_end(); 683 return 0; 684 685 unwind: 686 torture_init_end(); 687 scf_torture_cleanup(); 688 if (shutdown_secs) { 689 WARN_ON(!IS_MODULE(CONFIG_SCF_TORTURE_TEST)); 690 kernel_power_off(); 691 } 692 return firsterr; 693 } 694 695 module_init(scf_torture_init); 696 module_exit(scf_torture_cleanup); 697