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e9d338a0 PM |
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 SCFTORTOUT(s, x...) \ | |
42 | pr_alert(SCFTORT_FLAG s, ## x) | |
43 | ||
44 | #define VERBOSE_SCFTORTOUT(s, x...) \ | |
45 | do { if (verbose) pr_alert(SCFTORT_FLAG s, ## x); } while (0) | |
46 | ||
47 | #define VERBOSE_SCFTORTOUT_ERRSTRING(s, x...) \ | |
48 | do { if (verbose) pr_alert(SCFTORT_FLAG "!!! " s, ## x); } while (0) | |
49 | ||
50 | MODULE_LICENSE("GPL"); | |
51 | MODULE_AUTHOR("Paul E. McKenney <paulmck@kernel.org>"); | |
52 | ||
53 | // Wait until there are multiple CPUs before starting test. | |
54 | torture_param(int, holdoff, IS_BUILTIN(CONFIG_SCF_TORTURE_TEST) ? 10 : 0, | |
55 | "Holdoff time before test start (s)"); | |
56 | torture_param(int, longwait, 0, "Include ridiculously long waits? (seconds)"); | |
57 | torture_param(int, nthreads, -1, "# threads, defaults to -1 for all CPUs."); | |
58 | torture_param(int, onoff_holdoff, 0, "Time after boot before CPU hotplugs (s)"); | |
59 | torture_param(int, onoff_interval, 0, "Time between CPU hotplugs (s), 0=disable"); | |
60 | torture_param(int, shutdown_secs, 0, "Shutdown time (ms), <= zero to disable."); | |
61 | torture_param(int, stat_interval, 60, "Number of seconds between stats printk()s."); | |
62 | torture_param(int, stutter_cpus, 5, "Number of jiffies to change CPUs under test, 0=disable"); | |
63 | torture_param(bool, use_cpus_read_lock, 0, "Use cpus_read_lock() to exclude CPU hotplug."); | |
64 | torture_param(int, verbose, 0, "Enable verbose debugging printk()s"); | |
65 | torture_param(int, weight_single, -1, "Testing weight for single-CPU no-wait operations."); | |
66 | torture_param(int, weight_single_wait, -1, "Testing weight for single-CPU operations."); | |
5022b8ac PM |
67 | torture_param(int, weight_many, -1, "Testing weight for multi-CPU no-wait operations."); |
68 | torture_param(int, weight_many_wait, -1, "Testing weight for multi-CPU operations."); | |
e9d338a0 PM |
69 | torture_param(int, weight_all, -1, "Testing weight for all-CPU no-wait operations."); |
70 | torture_param(int, weight_all_wait, -1, "Testing weight for all-CPU operations."); | |
71 | ||
72 | char *torture_type = ""; | |
73 | ||
74 | #ifdef MODULE | |
75 | # define SCFTORT_SHUTDOWN 0 | |
76 | #else | |
77 | # define SCFTORT_SHUTDOWN 1 | |
78 | #endif | |
79 | ||
80 | torture_param(bool, shutdown, SCFTORT_SHUTDOWN, "Shutdown at end of torture test."); | |
81 | ||
82 | struct scf_statistics { | |
83 | struct task_struct *task; | |
84 | int cpu; | |
85 | long long n_single; | |
5022b8ac | 86 | long long n_single_ofl; |
e9d338a0 | 87 | long long n_single_wait; |
5022b8ac PM |
88 | long long n_single_wait_ofl; |
89 | long long n_many; | |
90 | long long n_many_wait; | |
e9d338a0 PM |
91 | long long n_all; |
92 | long long n_all_wait; | |
93 | }; | |
94 | ||
95 | static struct scf_statistics *scf_stats_p; | |
96 | static struct task_struct *scf_torture_stats_task; | |
97 | static DEFINE_PER_CPU(long long, scf_invoked_count); | |
98 | ||
5022b8ac PM |
99 | // Data for random primitive selection |
100 | #define SCF_PRIM_SINGLE 0 | |
101 | #define SCF_PRIM_MANY 1 | |
102 | #define SCF_PRIM_ALL 2 | |
103 | #define SCF_NPRIMS (2 * 3) // Need wait and no-wait versions of each. | |
104 | ||
105 | static char *scf_prim_name[] = { | |
106 | "smp_call_function_single", | |
107 | "smp_call_function_many", | |
108 | "smp_call_function", | |
109 | }; | |
110 | ||
111 | struct scf_selector { | |
112 | unsigned long scfs_weight; | |
113 | int scfs_prim; | |
114 | bool scfs_wait; | |
115 | }; | |
116 | static struct scf_selector scf_sel_array[SCF_NPRIMS]; | |
117 | static int scf_sel_array_len; | |
118 | static unsigned long scf_sel_totweight; | |
119 | ||
b93e21a5 PM |
120 | // Communicate between caller and handler. |
121 | struct scf_check { | |
122 | bool scfc_in; | |
123 | bool scfc_out; | |
124 | int scfc_cpu; // -1 for not _single(). | |
125 | bool scfc_wait; | |
126 | }; | |
127 | ||
e9d338a0 PM |
128 | // Use to wait for all threads to start. |
129 | static atomic_t n_started; | |
130 | static atomic_t n_errs; | |
b93e21a5 PM |
131 | static atomic_t n_mb_in_errs; |
132 | static atomic_t n_mb_out_errs; | |
133 | static atomic_t n_alloc_errs; | |
e9d338a0 PM |
134 | static bool scfdone; |
135 | ||
136 | DEFINE_TORTURE_RANDOM_PERCPU(scf_torture_rand); | |
137 | ||
138 | // Print torture statistics. Caller must ensure serialization. | |
139 | static void scf_torture_stats_print(void) | |
140 | { | |
141 | int cpu; | |
dba3142b | 142 | int i; |
e9d338a0 PM |
143 | long long invoked_count = 0; |
144 | bool isdone = READ_ONCE(scfdone); | |
dba3142b | 145 | struct scf_statistics scfs = {}; |
e9d338a0 PM |
146 | |
147 | for_each_possible_cpu(cpu) | |
148 | invoked_count += data_race(per_cpu(scf_invoked_count, cpu)); | |
dba3142b PM |
149 | for (i = 0; i < nthreads; i++) { |
150 | scfs.n_single += scf_stats_p[i].n_single; | |
151 | scfs.n_single_ofl += scf_stats_p[i].n_single_ofl; | |
152 | scfs.n_single_wait += scf_stats_p[i].n_single_wait; | |
153 | scfs.n_single_wait_ofl += scf_stats_p[i].n_single_wait_ofl; | |
154 | scfs.n_many += scf_stats_p[i].n_many; | |
155 | scfs.n_many_wait += scf_stats_p[i].n_many_wait; | |
156 | scfs.n_all += scf_stats_p[i].n_all; | |
157 | scfs.n_all_wait += scf_stats_p[i].n_all_wait; | |
158 | } | |
159 | pr_alert("%s scf_invoked_count %s: %lld single: %lld/%lld single_ofl: %lld/%lld many: %lld/%lld all: %lld/%lld ", | |
160 | SCFTORT_FLAG, isdone ? "VER" : "ver", invoked_count, | |
161 | scfs.n_single, scfs.n_single_wait, scfs.n_single_ofl, scfs.n_single_wait_ofl, | |
162 | scfs.n_many, scfs.n_many_wait, scfs.n_all, scfs.n_all_wait); | |
e9d338a0 PM |
163 | torture_onoff_stats(); |
164 | pr_cont("\n"); | |
165 | } | |
166 | ||
167 | // Periodically prints torture statistics, if periodic statistics printing | |
168 | // was specified via the stat_interval module parameter. | |
169 | static int | |
170 | scf_torture_stats(void *arg) | |
171 | { | |
172 | VERBOSE_TOROUT_STRING("scf_torture_stats task started"); | |
173 | do { | |
174 | schedule_timeout_interruptible(stat_interval * HZ); | |
175 | scf_torture_stats_print(); | |
176 | torture_shutdown_absorb("scf_torture_stats"); | |
177 | } while (!torture_must_stop()); | |
178 | torture_kthread_stopping("scf_torture_stats"); | |
179 | return 0; | |
180 | } | |
181 | ||
5022b8ac PM |
182 | // Add a primitive to the scf_sel_array[]. |
183 | static void scf_sel_add(unsigned long weight, int prim, bool wait) | |
184 | { | |
185 | struct scf_selector *scfsp = &scf_sel_array[scf_sel_array_len]; | |
186 | ||
187 | // If no weight, if array would overflow, if computing three-place | |
188 | // percentages would overflow, or if the scf_prim_name[] array would | |
189 | // overflow, don't bother. In the last three two cases, complain. | |
190 | if (!weight || | |
191 | WARN_ON_ONCE(scf_sel_array_len >= ARRAY_SIZE(scf_sel_array)) || | |
192 | WARN_ON_ONCE(0 - 100000 * weight <= 100000 * scf_sel_totweight) || | |
193 | WARN_ON_ONCE(prim >= ARRAY_SIZE(scf_prim_name))) | |
194 | return; | |
195 | scf_sel_totweight += weight; | |
196 | scfsp->scfs_weight = scf_sel_totweight; | |
197 | scfsp->scfs_prim = prim; | |
198 | scfsp->scfs_wait = wait; | |
199 | scf_sel_array_len++; | |
200 | } | |
201 | ||
202 | // Dump out weighting percentages for scf_prim_name[] array. | |
203 | static void scf_sel_dump(void) | |
204 | { | |
205 | int i; | |
206 | unsigned long oldw = 0; | |
207 | struct scf_selector *scfsp; | |
208 | unsigned long w; | |
209 | ||
210 | for (i = 0; i < scf_sel_array_len; i++) { | |
211 | scfsp = &scf_sel_array[i]; | |
212 | w = (scfsp->scfs_weight - oldw) * 100000 / scf_sel_totweight; | |
213 | pr_info("%s: %3lu.%03lu %s(%s)\n", __func__, w / 1000, w % 1000, | |
214 | scf_prim_name[scfsp->scfs_prim], | |
215 | scfsp->scfs_wait ? "wait" : "nowait"); | |
216 | oldw = scfsp->scfs_weight; | |
217 | } | |
218 | } | |
219 | ||
220 | // Randomly pick a primitive and wait/nowait, based on weightings. | |
221 | static struct scf_selector *scf_sel_rand(struct torture_random_state *trsp) | |
222 | { | |
223 | int i; | |
224 | unsigned long w = torture_random(trsp) % (scf_sel_totweight + 1); | |
225 | ||
226 | for (i = 0; i < scf_sel_array_len; i++) | |
227 | if (scf_sel_array[i].scfs_weight >= w) | |
228 | return &scf_sel_array[i]; | |
229 | WARN_ON_ONCE(1); | |
230 | return &scf_sel_array[0]; | |
231 | } | |
232 | ||
e9d338a0 PM |
233 | // Update statistics and occasionally burn up mass quantities of CPU time, |
234 | // if told to do so via scftorture.longwait. Otherwise, occasionally burn | |
235 | // a little bit. | |
b93e21a5 | 236 | static void scf_handler(void *scfc_in) |
e9d338a0 PM |
237 | { |
238 | int i; | |
239 | int j; | |
240 | unsigned long r = torture_random(this_cpu_ptr(&scf_torture_rand)); | |
b93e21a5 | 241 | struct scf_check *scfcp = scfc_in; |
e9d338a0 | 242 | |
980205ee PM |
243 | if (likely(scfcp)) { |
244 | WRITE_ONCE(scfcp->scfc_out, false); // For multiple receivers. | |
245 | if (WARN_ON_ONCE(unlikely(!READ_ONCE(scfcp->scfc_in)))) | |
246 | atomic_inc(&n_mb_in_errs); | |
247 | } | |
e9d338a0 PM |
248 | this_cpu_inc(scf_invoked_count); |
249 | if (longwait <= 0) { | |
250 | if (!(r & 0xffc0)) | |
251 | udelay(r & 0x3f); | |
b93e21a5 | 252 | goto out; |
e9d338a0 PM |
253 | } |
254 | if (r & 0xfff) | |
b93e21a5 | 255 | goto out; |
e9d338a0 PM |
256 | r = (r >> 12); |
257 | if (longwait <= 0) { | |
258 | udelay((r & 0xff) + 1); | |
b93e21a5 | 259 | goto out; |
e9d338a0 PM |
260 | } |
261 | r = r % longwait + 1; | |
262 | for (i = 0; i < r; i++) { | |
263 | for (j = 0; j < 1000; j++) { | |
264 | udelay(1000); | |
265 | cpu_relax(); | |
266 | } | |
267 | } | |
b93e21a5 PM |
268 | out: |
269 | if (unlikely(!scfcp)) | |
270 | return; | |
271 | if (scfcp->scfc_wait) | |
272 | WRITE_ONCE(scfcp->scfc_out, true); | |
273 | else | |
274 | kfree(scfcp); | |
e9d338a0 PM |
275 | } |
276 | ||
5022b8ac | 277 | // As above, but check for correct CPU. |
b93e21a5 | 278 | static void scf_handler_1(void *scfc_in) |
5022b8ac | 279 | { |
b93e21a5 PM |
280 | struct scf_check *scfcp = scfc_in; |
281 | ||
282 | 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())) { | |
5022b8ac | 283 | atomic_inc(&n_errs); |
b93e21a5 PM |
284 | } |
285 | scf_handler(scfcp); | |
5022b8ac PM |
286 | } |
287 | ||
e9d338a0 | 288 | // Randomly do an smp_call_function*() invocation. |
5022b8ac | 289 | static void scftorture_invoke_one(struct scf_statistics *scfp, struct torture_random_state *trsp) |
e9d338a0 | 290 | { |
5022b8ac | 291 | uintptr_t cpu; |
676e5469 | 292 | int ret = 0; |
b93e21a5 | 293 | struct scf_check *scfcp = NULL; |
5022b8ac PM |
294 | struct scf_selector *scfsp = scf_sel_rand(trsp); |
295 | ||
e9d338a0 PM |
296 | if (use_cpus_read_lock) |
297 | cpus_read_lock(); | |
298 | else | |
299 | preempt_disable(); | |
34e8c483 | 300 | if (scfsp->scfs_prim == SCF_PRIM_SINGLE || scfsp->scfs_wait) { |
b93e21a5 | 301 | scfcp = kmalloc(sizeof(*scfcp), GFP_ATOMIC); |
4df55bdd | 302 | if (WARN_ON_ONCE(!scfcp)) { |
b93e21a5 | 303 | atomic_inc(&n_alloc_errs); |
4df55bdd PM |
304 | } else { |
305 | scfcp->scfc_cpu = -1; | |
306 | scfcp->scfc_wait = scfsp->scfs_wait; | |
307 | scfcp->scfc_out = false; | |
308 | } | |
34e8c483 PM |
309 | } |
310 | switch (scfsp->scfs_prim) { | |
311 | case SCF_PRIM_SINGLE: | |
5022b8ac PM |
312 | cpu = torture_random(trsp) % nr_cpu_ids; |
313 | if (scfsp->scfs_wait) | |
314 | scfp->n_single_wait++; | |
315 | else | |
316 | scfp->n_single++; | |
b93e21a5 PM |
317 | if (scfcp) { |
318 | scfcp->scfc_cpu = cpu; | |
b93e21a5 PM |
319 | scfcp->scfc_in = true; |
320 | } | |
321 | ret = smp_call_function_single(cpu, scf_handler_1, (void *)scfcp, scfsp->scfs_wait); | |
5022b8ac PM |
322 | if (ret) { |
323 | if (scfsp->scfs_wait) | |
324 | scfp->n_single_wait_ofl++; | |
325 | else | |
326 | scfp->n_single_ofl++; | |
b93e21a5 | 327 | kfree(scfcp); |
676e5469 | 328 | scfcp = NULL; |
5022b8ac PM |
329 | } |
330 | break; | |
331 | case SCF_PRIM_MANY: | |
332 | if (scfsp->scfs_wait) | |
333 | scfp->n_many_wait++; | |
334 | else | |
335 | scfp->n_many++; | |
4df55bdd | 336 | if (scfcp) |
980205ee | 337 | scfcp->scfc_in = true; |
980205ee | 338 | smp_call_function_many(cpu_online_mask, scf_handler, scfcp, scfsp->scfs_wait); |
5022b8ac PM |
339 | break; |
340 | case SCF_PRIM_ALL: | |
341 | if (scfsp->scfs_wait) | |
342 | scfp->n_all_wait++; | |
343 | else | |
344 | scfp->n_all++; | |
4df55bdd | 345 | if (scfcp) |
34e8c483 | 346 | scfcp->scfc_in = true; |
34e8c483 | 347 | smp_call_function(scf_handler, scfcp, scfsp->scfs_wait); |
5022b8ac PM |
348 | break; |
349 | } | |
676e5469 PM |
350 | if (scfcp && scfsp->scfs_wait) { |
351 | if (WARN_ON_ONCE(!scfcp->scfc_out)) | |
352 | atomic_inc(&n_mb_out_errs); // Leak rather than trash! | |
353 | else | |
354 | kfree(scfcp); | |
355 | } | |
e9d338a0 PM |
356 | if (use_cpus_read_lock) |
357 | cpus_read_unlock(); | |
358 | else | |
359 | preempt_enable(); | |
360 | if (!(torture_random(trsp) & 0xfff)) | |
361 | schedule_timeout_uninterruptible(1); | |
362 | } | |
363 | ||
364 | // SCF test kthread. Repeatedly does calls to members of the | |
365 | // smp_call_function() family of functions. | |
366 | static int scftorture_invoker(void *arg) | |
367 | { | |
368 | DEFINE_TORTURE_RANDOM(rand); | |
369 | struct scf_statistics *scfp = (struct scf_statistics *)arg; | |
370 | ||
371 | VERBOSE_SCFTORTOUT("scftorture_invoker %d: task started", scfp->cpu); | |
372 | set_cpus_allowed_ptr(current, cpumask_of(scfp->cpu % nr_cpu_ids)); | |
373 | set_user_nice(current, MAX_NICE); | |
374 | if (holdoff) | |
375 | schedule_timeout_interruptible(holdoff * HZ); | |
376 | ||
377 | VERBOSE_SCFTORTOUT("scftorture_invoker %d: Waiting for all SCF torturers from cpu %d", scfp->cpu, smp_processor_id()); | |
378 | ||
379 | // Make sure that the CPU is affinitized appropriately during testing. | |
380 | WARN_ON_ONCE(smp_processor_id() != scfp->cpu); | |
381 | ||
382 | if (!atomic_dec_return(&n_started)) | |
383 | while (atomic_read_acquire(&n_started)) { | |
384 | if (torture_must_stop()) { | |
385 | VERBOSE_SCFTORTOUT("scftorture_invoker %d ended before starting", scfp->cpu); | |
386 | goto end; | |
387 | } | |
388 | schedule_timeout_uninterruptible(1); | |
389 | } | |
390 | ||
391 | VERBOSE_SCFTORTOUT("scftorture_invoker %d started", scfp->cpu); | |
392 | ||
393 | do { | |
394 | scftorture_invoke_one(scfp, &rand); | |
395 | } while (!torture_must_stop()); | |
396 | ||
397 | VERBOSE_SCFTORTOUT("scftorture_invoker %d ended", scfp->cpu); | |
398 | end: | |
399 | torture_kthread_stopping("scftorture_invoker"); | |
400 | return 0; | |
401 | } | |
402 | ||
403 | static void | |
404 | scftorture_print_module_parms(const char *tag) | |
405 | { | |
406 | pr_alert(SCFTORT_FLAG | |
5022b8ac PM |
407 | "--- %s: verbose=%d holdoff=%d longwait=%d nthreads=%d onoff_holdoff=%d onoff_interval=%d shutdown_secs=%d stat_interval=%d stutter_cpus=%d use_cpus_read_lock=%d, weight_single=%d, weight_single_wait=%d, weight_many=%d, weight_many_wait=%d, weight_all=%d, weight_all_wait=%d\n", tag, |
408 | verbose, holdoff, longwait, nthreads, onoff_holdoff, onoff_interval, shutdown, stat_interval, stutter_cpus, use_cpus_read_lock, weight_single, weight_single_wait, weight_many, weight_many_wait, weight_all, weight_all_wait); | |
e9d338a0 PM |
409 | } |
410 | ||
411 | static void scf_cleanup_handler(void *unused) | |
412 | { | |
413 | } | |
414 | ||
415 | static void scf_torture_cleanup(void) | |
416 | { | |
417 | int i; | |
418 | ||
419 | if (torture_cleanup_begin()) | |
420 | return; | |
421 | ||
422 | WRITE_ONCE(scfdone, true); | |
423 | if (nthreads) | |
424 | for (i = 0; i < nthreads; i++) | |
425 | torture_stop_kthread("scftorture_invoker", scf_stats_p[i].task); | |
426 | else | |
427 | goto end; | |
e9d338a0 PM |
428 | smp_call_function(scf_cleanup_handler, NULL, 0); |
429 | torture_stop_kthread(scf_torture_stats, scf_torture_stats_task); | |
430 | scf_torture_stats_print(); // -After- the stats thread is stopped! | |
dba3142b PM |
431 | kfree(scf_stats_p); // -After- the last stats print has completed! |
432 | scf_stats_p = NULL; | |
e9d338a0 PM |
433 | |
434 | if (atomic_read(&n_errs)) | |
435 | scftorture_print_module_parms("End of test: FAILURE"); | |
436 | else if (torture_onoff_failures()) | |
437 | scftorture_print_module_parms("End of test: LOCK_HOTPLUG"); | |
438 | else | |
439 | scftorture_print_module_parms("End of test: SUCCESS"); | |
440 | ||
441 | end: | |
442 | torture_cleanup_end(); | |
443 | } | |
444 | ||
445 | static int __init scf_torture_init(void) | |
446 | { | |
447 | long i; | |
448 | int firsterr = 0; | |
5022b8ac PM |
449 | unsigned long weight_single1 = weight_single; |
450 | unsigned long weight_single_wait1 = weight_single_wait; | |
451 | unsigned long weight_many1 = weight_many; | |
452 | unsigned long weight_many_wait1 = weight_many_wait; | |
453 | unsigned long weight_all1 = weight_all; | |
454 | unsigned long weight_all_wait1 = weight_all_wait; | |
e9d338a0 PM |
455 | |
456 | if (!torture_init_begin(SCFTORT_STRING, verbose)) | |
457 | return -EBUSY; | |
458 | ||
459 | scftorture_print_module_parms("Start of test"); | |
460 | ||
461 | if (weight_single == -1 && weight_single_wait == -1 && | |
5022b8ac | 462 | weight_many == -1 && weight_many_wait == -1 && |
e9d338a0 | 463 | weight_all == -1 && weight_all_wait == -1) { |
5022b8ac PM |
464 | weight_single1 = 2 * nr_cpu_ids; |
465 | weight_single_wait1 = 2 * nr_cpu_ids; | |
466 | weight_many1 = 2; | |
467 | weight_many_wait1 = 2; | |
468 | weight_all1 = 1; | |
469 | weight_all_wait1 = 1; | |
e9d338a0 PM |
470 | } else { |
471 | if (weight_single == -1) | |
5022b8ac | 472 | weight_single1 = 0; |
e9d338a0 | 473 | if (weight_single_wait == -1) |
5022b8ac PM |
474 | weight_single_wait1 = 0; |
475 | if (weight_many == -1) | |
476 | weight_many1 = 0; | |
477 | if (weight_many_wait == -1) | |
478 | weight_many_wait1 = 0; | |
e9d338a0 | 479 | if (weight_all == -1) |
5022b8ac | 480 | weight_all1 = 0; |
e9d338a0 | 481 | if (weight_all_wait == -1) |
5022b8ac | 482 | weight_all_wait1 = 0; |
e9d338a0 | 483 | } |
5022b8ac PM |
484 | if (weight_single1 == 0 && weight_single_wait1 == 0 && |
485 | weight_many1 == 0 && weight_many_wait1 == 0 && | |
486 | weight_all1 == 0 && weight_all_wait1 == 0) { | |
487 | VERBOSE_SCFTORTOUT_ERRSTRING("all zero weights makes no sense"); | |
e9d338a0 PM |
488 | firsterr = -EINVAL; |
489 | goto unwind; | |
490 | } | |
5022b8ac PM |
491 | scf_sel_add(weight_single1, SCF_PRIM_SINGLE, false); |
492 | scf_sel_add(weight_single_wait1, SCF_PRIM_SINGLE, true); | |
493 | scf_sel_add(weight_many1, SCF_PRIM_MANY, false); | |
494 | scf_sel_add(weight_many_wait1, SCF_PRIM_MANY, true); | |
495 | scf_sel_add(weight_all1, SCF_PRIM_ALL, false); | |
496 | scf_sel_add(weight_all_wait1, SCF_PRIM_ALL, true); | |
497 | scf_sel_dump(); | |
e9d338a0 PM |
498 | |
499 | if (onoff_interval > 0) { | |
500 | firsterr = torture_onoff_init(onoff_holdoff * HZ, onoff_interval, NULL); | |
501 | if (firsterr) | |
502 | goto unwind; | |
503 | } | |
504 | if (shutdown_secs > 0) { | |
505 | firsterr = torture_shutdown_init(shutdown_secs, scf_torture_cleanup); | |
506 | if (firsterr) | |
507 | goto unwind; | |
508 | } | |
509 | ||
510 | // Worker tasks invoking smp_call_function(). | |
511 | if (nthreads < 0) | |
512 | nthreads = num_online_cpus(); | |
513 | scf_stats_p = kcalloc(nthreads, sizeof(scf_stats_p[0]), GFP_KERNEL); | |
514 | if (!scf_stats_p) { | |
515 | VERBOSE_SCFTORTOUT_ERRSTRING("out of memory"); | |
516 | firsterr = -ENOMEM; | |
517 | goto unwind; | |
518 | } | |
519 | ||
520 | VERBOSE_SCFTORTOUT("Starting %d smp_call_function() threads\n", nthreads); | |
521 | ||
522 | atomic_set(&n_started, nthreads); | |
523 | for (i = 0; i < nthreads; i++) { | |
524 | scf_stats_p[i].cpu = i; | |
525 | firsterr = torture_create_kthread(scftorture_invoker, (void *)&scf_stats_p[i], | |
526 | scf_stats_p[i].task); | |
527 | if (firsterr) | |
528 | goto unwind; | |
529 | } | |
530 | if (stat_interval > 0) { | |
531 | firsterr = torture_create_kthread(scf_torture_stats, NULL, scf_torture_stats_task); | |
532 | if (firsterr) | |
533 | goto unwind; | |
534 | } | |
535 | ||
536 | torture_init_end(); | |
537 | return 0; | |
538 | ||
539 | unwind: | |
540 | torture_init_end(); | |
541 | scf_torture_cleanup(); | |
542 | return firsterr; | |
543 | } | |
544 | ||
545 | module_init(scf_torture_init); | |
546 | module_exit(scf_torture_cleanup); |