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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 <[email protected]>
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
46MODULE_DESCRIPTION("Torture tests on the smp_call_function() family of primitives");
47MODULE_LICENSE("GPL");
48MODULE_AUTHOR("Paul E. McKenney <[email protected]>");
49
50// Wait until there are multiple CPUs before starting test.
51torture_param(int, holdoff, IS_BUILTIN(CONFIG_SCF_TORTURE_TEST) ? 10 : 0,
52 "Holdoff time before test start (s)");
53torture_param(int, longwait, 0, "Include ridiculously long waits? (seconds)");
54torture_param(int, nthreads, -1, "# threads, defaults to -1 for all CPUs.");
55torture_param(int, onoff_holdoff, 0, "Time after boot before CPU hotplugs (s)");
56torture_param(int, onoff_interval, 0, "Time between CPU hotplugs (s), 0=disable");
57torture_param(int, shutdown_secs, 0, "Shutdown time (ms), <= zero to disable.");
58torture_param(int, stat_interval, 60, "Number of seconds between stats printk()s.");
59torture_param(int, stutter, 5, "Number of jiffies to run/halt test, 0=disable");
60torture_param(bool, use_cpus_read_lock, 0, "Use cpus_read_lock() to exclude CPU hotplug.");
61torture_param(int, verbose, 0, "Enable verbose debugging printk()s");
62torture_param(int, weight_resched, -1, "Testing weight for resched_cpu() operations.");
63torture_param(int, weight_single, -1, "Testing weight for single-CPU no-wait operations.");
64torture_param(int, weight_single_rpc, -1, "Testing weight for single-CPU RPC operations.");
65torture_param(int, weight_single_wait, -1, "Testing weight for single-CPU operations.");
66torture_param(int, weight_many, -1, "Testing weight for multi-CPU no-wait operations.");
67torture_param(int, weight_many_wait, -1, "Testing weight for multi-CPU operations.");
68torture_param(int, weight_all, -1, "Testing weight for all-CPU no-wait operations.");
69torture_param(int, weight_all_wait, -1, "Testing weight for all-CPU operations.");
70
71static char *torture_type = "";
72
73#ifdef MODULE
74# define SCFTORT_SHUTDOWN 0
75#else
76# define SCFTORT_SHUTDOWN 1
77#endif
78
79torture_param(bool, shutdown, SCFTORT_SHUTDOWN, "Shutdown at end of torture test.");
80
81struct 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
97static struct scf_statistics *scf_stats_p;
98static struct task_struct *scf_torture_stats_task;
99static DEFINE_PER_CPU(long long, scf_invoked_count);
100static 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
112static 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
120struct scf_selector {
121 unsigned long scfs_weight;
122 int scfs_prim;
123 bool scfs_wait;
124};
125static struct scf_selector scf_sel_array[SCF_NPRIMS];
126static int scf_sel_array_len;
127static unsigned long scf_sel_totweight;
128
129// Communicate between caller and handler.
130struct 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.
141static atomic_t n_started;
142static atomic_t n_errs;
143static atomic_t n_mb_in_errs;
144static atomic_t n_mb_out_errs;
145static atomic_t n_alloc_errs;
146static bool scfdone;
147static char *bangstr = "";
148
149static DEFINE_TORTURE_RANDOM_PERCPU(scf_torture_rand);
150
151extern void resched_cpu(int cpu); // An alternative IPI vector.
152
153static 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
165static 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.
181static 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.
221static int
222scf_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[].
235static 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.
255static 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.
273static 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.
288static 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 }
321out:
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.
334static 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.
345static 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.
472static 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);
523end:
524 torture_kthread_stopping("scftorture_invoker");
525 return 0;
526}
527
528static void
529scftorture_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
536static void scf_cleanup_handler(void *unused)
537{
538}
539
540static 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
569end:
570 torture_cleanup_end();
571}
572
573static 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
686unwind:
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
696module_init(scf_torture_init);
697module_exit(scf_torture_cleanup);