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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 | 134 | static bool scfdone; |
dbf83b65 | 135 | static char *bangstr = ""; |
e9d338a0 | 136 | |
9a52a574 | 137 | static DEFINE_TORTURE_RANDOM_PERCPU(scf_torture_rand); |
e9d338a0 PM |
138 | |
139 | // Print torture statistics. Caller must ensure serialization. | |
140 | static void scf_torture_stats_print(void) | |
141 | { | |
142 | int cpu; | |
dba3142b | 143 | int i; |
e9d338a0 PM |
144 | long long invoked_count = 0; |
145 | bool isdone = READ_ONCE(scfdone); | |
dba3142b | 146 | struct scf_statistics scfs = {}; |
e9d338a0 PM |
147 | |
148 | for_each_possible_cpu(cpu) | |
149 | invoked_count += data_race(per_cpu(scf_invoked_count, cpu)); | |
dba3142b PM |
150 | for (i = 0; i < nthreads; i++) { |
151 | scfs.n_single += scf_stats_p[i].n_single; | |
152 | scfs.n_single_ofl += scf_stats_p[i].n_single_ofl; | |
153 | scfs.n_single_wait += scf_stats_p[i].n_single_wait; | |
154 | scfs.n_single_wait_ofl += scf_stats_p[i].n_single_wait_ofl; | |
155 | scfs.n_many += scf_stats_p[i].n_many; | |
156 | scfs.n_many_wait += scf_stats_p[i].n_many_wait; | |
157 | scfs.n_all += scf_stats_p[i].n_all; | |
158 | scfs.n_all_wait += scf_stats_p[i].n_all_wait; | |
159 | } | |
dbf83b65 PM |
160 | if (atomic_read(&n_errs) || atomic_read(&n_mb_in_errs) || |
161 | atomic_read(&n_mb_out_errs) || atomic_read(&n_alloc_errs)) | |
162 | bangstr = "!!! "; | |
163 | pr_alert("%s %sscf_invoked_count %s: %lld single: %lld/%lld single_ofl: %lld/%lld many: %lld/%lld all: %lld/%lld ", | |
164 | SCFTORT_FLAG, bangstr, isdone ? "VER" : "ver", invoked_count, | |
dba3142b PM |
165 | scfs.n_single, scfs.n_single_wait, scfs.n_single_ofl, scfs.n_single_wait_ofl, |
166 | scfs.n_many, scfs.n_many_wait, scfs.n_all, scfs.n_all_wait); | |
e9d338a0 | 167 | torture_onoff_stats(); |
dbf83b65 PM |
168 | pr_cont("ste: %d stnmie: %d stnmoe: %d staf: %d\n", atomic_read(&n_errs), |
169 | atomic_read(&n_mb_in_errs), atomic_read(&n_mb_out_errs), | |
170 | atomic_read(&n_alloc_errs)); | |
e9d338a0 PM |
171 | } |
172 | ||
173 | // Periodically prints torture statistics, if periodic statistics printing | |
174 | // was specified via the stat_interval module parameter. | |
175 | static int | |
176 | scf_torture_stats(void *arg) | |
177 | { | |
178 | VERBOSE_TOROUT_STRING("scf_torture_stats task started"); | |
179 | do { | |
180 | schedule_timeout_interruptible(stat_interval * HZ); | |
181 | scf_torture_stats_print(); | |
182 | torture_shutdown_absorb("scf_torture_stats"); | |
183 | } while (!torture_must_stop()); | |
184 | torture_kthread_stopping("scf_torture_stats"); | |
185 | return 0; | |
186 | } | |
187 | ||
5022b8ac PM |
188 | // Add a primitive to the scf_sel_array[]. |
189 | static void scf_sel_add(unsigned long weight, int prim, bool wait) | |
190 | { | |
191 | struct scf_selector *scfsp = &scf_sel_array[scf_sel_array_len]; | |
192 | ||
193 | // If no weight, if array would overflow, if computing three-place | |
194 | // percentages would overflow, or if the scf_prim_name[] array would | |
195 | // overflow, don't bother. In the last three two cases, complain. | |
196 | if (!weight || | |
197 | WARN_ON_ONCE(scf_sel_array_len >= ARRAY_SIZE(scf_sel_array)) || | |
198 | WARN_ON_ONCE(0 - 100000 * weight <= 100000 * scf_sel_totweight) || | |
199 | WARN_ON_ONCE(prim >= ARRAY_SIZE(scf_prim_name))) | |
200 | return; | |
201 | scf_sel_totweight += weight; | |
202 | scfsp->scfs_weight = scf_sel_totweight; | |
203 | scfsp->scfs_prim = prim; | |
204 | scfsp->scfs_wait = wait; | |
205 | scf_sel_array_len++; | |
206 | } | |
207 | ||
208 | // Dump out weighting percentages for scf_prim_name[] array. | |
209 | static void scf_sel_dump(void) | |
210 | { | |
211 | int i; | |
212 | unsigned long oldw = 0; | |
213 | struct scf_selector *scfsp; | |
214 | unsigned long w; | |
215 | ||
216 | for (i = 0; i < scf_sel_array_len; i++) { | |
217 | scfsp = &scf_sel_array[i]; | |
218 | w = (scfsp->scfs_weight - oldw) * 100000 / scf_sel_totweight; | |
219 | pr_info("%s: %3lu.%03lu %s(%s)\n", __func__, w / 1000, w % 1000, | |
220 | scf_prim_name[scfsp->scfs_prim], | |
221 | scfsp->scfs_wait ? "wait" : "nowait"); | |
222 | oldw = scfsp->scfs_weight; | |
223 | } | |
224 | } | |
225 | ||
226 | // Randomly pick a primitive and wait/nowait, based on weightings. | |
227 | static struct scf_selector *scf_sel_rand(struct torture_random_state *trsp) | |
228 | { | |
229 | int i; | |
230 | unsigned long w = torture_random(trsp) % (scf_sel_totweight + 1); | |
231 | ||
232 | for (i = 0; i < scf_sel_array_len; i++) | |
233 | if (scf_sel_array[i].scfs_weight >= w) | |
234 | return &scf_sel_array[i]; | |
235 | WARN_ON_ONCE(1); | |
236 | return &scf_sel_array[0]; | |
237 | } | |
238 | ||
e9d338a0 PM |
239 | // Update statistics and occasionally burn up mass quantities of CPU time, |
240 | // if told to do so via scftorture.longwait. Otherwise, occasionally burn | |
241 | // a little bit. | |
b93e21a5 | 242 | static void scf_handler(void *scfc_in) |
e9d338a0 PM |
243 | { |
244 | int i; | |
245 | int j; | |
246 | unsigned long r = torture_random(this_cpu_ptr(&scf_torture_rand)); | |
b93e21a5 | 247 | struct scf_check *scfcp = scfc_in; |
e9d338a0 | 248 | |
980205ee PM |
249 | if (likely(scfcp)) { |
250 | WRITE_ONCE(scfcp->scfc_out, false); // For multiple receivers. | |
251 | if (WARN_ON_ONCE(unlikely(!READ_ONCE(scfcp->scfc_in)))) | |
252 | atomic_inc(&n_mb_in_errs); | |
253 | } | |
e9d338a0 PM |
254 | this_cpu_inc(scf_invoked_count); |
255 | if (longwait <= 0) { | |
256 | if (!(r & 0xffc0)) | |
257 | udelay(r & 0x3f); | |
b93e21a5 | 258 | goto out; |
e9d338a0 PM |
259 | } |
260 | if (r & 0xfff) | |
b93e21a5 | 261 | goto out; |
e9d338a0 PM |
262 | r = (r >> 12); |
263 | if (longwait <= 0) { | |
264 | udelay((r & 0xff) + 1); | |
b93e21a5 | 265 | goto out; |
e9d338a0 PM |
266 | } |
267 | r = r % longwait + 1; | |
268 | for (i = 0; i < r; i++) { | |
269 | for (j = 0; j < 1000; j++) { | |
270 | udelay(1000); | |
271 | cpu_relax(); | |
272 | } | |
273 | } | |
b93e21a5 PM |
274 | out: |
275 | if (unlikely(!scfcp)) | |
276 | return; | |
277 | if (scfcp->scfc_wait) | |
278 | WRITE_ONCE(scfcp->scfc_out, true); | |
279 | else | |
280 | kfree(scfcp); | |
e9d338a0 PM |
281 | } |
282 | ||
5022b8ac | 283 | // As above, but check for correct CPU. |
b93e21a5 | 284 | static void scf_handler_1(void *scfc_in) |
5022b8ac | 285 | { |
b93e21a5 PM |
286 | struct scf_check *scfcp = scfc_in; |
287 | ||
288 | 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 | 289 | atomic_inc(&n_errs); |
b93e21a5 PM |
290 | } |
291 | scf_handler(scfcp); | |
5022b8ac PM |
292 | } |
293 | ||
e9d338a0 | 294 | // Randomly do an smp_call_function*() invocation. |
5022b8ac | 295 | static void scftorture_invoke_one(struct scf_statistics *scfp, struct torture_random_state *trsp) |
e9d338a0 | 296 | { |
5022b8ac | 297 | uintptr_t cpu; |
676e5469 | 298 | int ret = 0; |
b93e21a5 | 299 | struct scf_check *scfcp = NULL; |
5022b8ac PM |
300 | struct scf_selector *scfsp = scf_sel_rand(trsp); |
301 | ||
e9d338a0 PM |
302 | if (use_cpus_read_lock) |
303 | cpus_read_lock(); | |
304 | else | |
305 | preempt_disable(); | |
34e8c483 | 306 | if (scfsp->scfs_prim == SCF_PRIM_SINGLE || scfsp->scfs_wait) { |
b93e21a5 | 307 | scfcp = kmalloc(sizeof(*scfcp), GFP_ATOMIC); |
4df55bdd | 308 | if (WARN_ON_ONCE(!scfcp)) { |
b93e21a5 | 309 | atomic_inc(&n_alloc_errs); |
4df55bdd PM |
310 | } else { |
311 | scfcp->scfc_cpu = -1; | |
312 | scfcp->scfc_wait = scfsp->scfs_wait; | |
313 | scfcp->scfc_out = false; | |
314 | } | |
34e8c483 PM |
315 | } |
316 | switch (scfsp->scfs_prim) { | |
317 | case SCF_PRIM_SINGLE: | |
5022b8ac PM |
318 | cpu = torture_random(trsp) % nr_cpu_ids; |
319 | if (scfsp->scfs_wait) | |
320 | scfp->n_single_wait++; | |
321 | else | |
322 | scfp->n_single++; | |
b93e21a5 PM |
323 | if (scfcp) { |
324 | scfcp->scfc_cpu = cpu; | |
ee7035d2 | 325 | barrier(); // Prevent race-reduction compiler optimizations. |
b93e21a5 PM |
326 | scfcp->scfc_in = true; |
327 | } | |
328 | ret = smp_call_function_single(cpu, scf_handler_1, (void *)scfcp, scfsp->scfs_wait); | |
5022b8ac PM |
329 | if (ret) { |
330 | if (scfsp->scfs_wait) | |
331 | scfp->n_single_wait_ofl++; | |
332 | else | |
333 | scfp->n_single_ofl++; | |
b93e21a5 | 334 | kfree(scfcp); |
676e5469 | 335 | scfcp = NULL; |
5022b8ac PM |
336 | } |
337 | break; | |
338 | case SCF_PRIM_MANY: | |
339 | if (scfsp->scfs_wait) | |
340 | scfp->n_many_wait++; | |
341 | else | |
342 | scfp->n_many++; | |
ee7035d2 PM |
343 | if (scfcp) { |
344 | barrier(); // Prevent race-reduction compiler optimizations. | |
980205ee | 345 | scfcp->scfc_in = true; |
ee7035d2 | 346 | } |
980205ee | 347 | smp_call_function_many(cpu_online_mask, scf_handler, scfcp, scfsp->scfs_wait); |
5022b8ac PM |
348 | break; |
349 | case SCF_PRIM_ALL: | |
350 | if (scfsp->scfs_wait) | |
351 | scfp->n_all_wait++; | |
352 | else | |
353 | scfp->n_all++; | |
ee7035d2 PM |
354 | if (scfcp) { |
355 | barrier(); // Prevent race-reduction compiler optimizations. | |
34e8c483 | 356 | scfcp->scfc_in = true; |
ee7035d2 | 357 | } |
34e8c483 | 358 | smp_call_function(scf_handler, scfcp, scfsp->scfs_wait); |
5022b8ac | 359 | break; |
de77d4da PM |
360 | default: |
361 | WARN_ON_ONCE(1); | |
362 | if (scfcp) | |
363 | scfcp->scfc_out = true; | |
5022b8ac | 364 | } |
676e5469 | 365 | if (scfcp && scfsp->scfs_wait) { |
9e66bf03 PM |
366 | if (WARN_ON_ONCE((num_online_cpus() > 1 || scfsp->scfs_prim == SCF_PRIM_SINGLE) && |
367 | !scfcp->scfc_out)) | |
676e5469 PM |
368 | atomic_inc(&n_mb_out_errs); // Leak rather than trash! |
369 | else | |
370 | kfree(scfcp); | |
ee7035d2 | 371 | barrier(); // Prevent race-reduction compiler optimizations. |
676e5469 | 372 | } |
e9d338a0 PM |
373 | if (use_cpus_read_lock) |
374 | cpus_read_unlock(); | |
375 | else | |
376 | preempt_enable(); | |
377 | if (!(torture_random(trsp) & 0xfff)) | |
378 | schedule_timeout_uninterruptible(1); | |
379 | } | |
380 | ||
381 | // SCF test kthread. Repeatedly does calls to members of the | |
382 | // smp_call_function() family of functions. | |
383 | static int scftorture_invoker(void *arg) | |
384 | { | |
a7c072ef | 385 | int cpu; |
e9d338a0 PM |
386 | DEFINE_TORTURE_RANDOM(rand); |
387 | struct scf_statistics *scfp = (struct scf_statistics *)arg; | |
a7c072ef | 388 | bool was_offline = false; |
e9d338a0 PM |
389 | |
390 | VERBOSE_SCFTORTOUT("scftorture_invoker %d: task started", scfp->cpu); | |
a7c072ef PM |
391 | cpu = scfp->cpu % nr_cpu_ids; |
392 | set_cpus_allowed_ptr(current, cpumask_of(cpu)); | |
e9d338a0 PM |
393 | set_user_nice(current, MAX_NICE); |
394 | if (holdoff) | |
395 | schedule_timeout_interruptible(holdoff * HZ); | |
396 | ||
397 | VERBOSE_SCFTORTOUT("scftorture_invoker %d: Waiting for all SCF torturers from cpu %d", scfp->cpu, smp_processor_id()); | |
398 | ||
399 | // Make sure that the CPU is affinitized appropriately during testing. | |
400 | WARN_ON_ONCE(smp_processor_id() != scfp->cpu); | |
401 | ||
402 | if (!atomic_dec_return(&n_started)) | |
403 | while (atomic_read_acquire(&n_started)) { | |
404 | if (torture_must_stop()) { | |
405 | VERBOSE_SCFTORTOUT("scftorture_invoker %d ended before starting", scfp->cpu); | |
406 | goto end; | |
407 | } | |
408 | schedule_timeout_uninterruptible(1); | |
409 | } | |
410 | ||
411 | VERBOSE_SCFTORTOUT("scftorture_invoker %d started", scfp->cpu); | |
412 | ||
413 | do { | |
414 | scftorture_invoke_one(scfp, &rand); | |
a7c072ef PM |
415 | while (cpu_is_offline(cpu) && !torture_must_stop()) { |
416 | schedule_timeout_interruptible(HZ / 5); | |
417 | was_offline = true; | |
418 | } | |
419 | if (was_offline) { | |
420 | set_cpus_allowed_ptr(current, cpumask_of(cpu)); | |
421 | was_offline = false; | |
422 | } | |
65bd77f5 | 423 | cond_resched(); |
e9d338a0 PM |
424 | } while (!torture_must_stop()); |
425 | ||
426 | VERBOSE_SCFTORTOUT("scftorture_invoker %d ended", scfp->cpu); | |
427 | end: | |
428 | torture_kthread_stopping("scftorture_invoker"); | |
429 | return 0; | |
430 | } | |
431 | ||
432 | static void | |
433 | scftorture_print_module_parms(const char *tag) | |
434 | { | |
435 | pr_alert(SCFTORT_FLAG | |
5022b8ac PM |
436 | "--- %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, |
437 | 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 |
438 | } |
439 | ||
440 | static void scf_cleanup_handler(void *unused) | |
441 | { | |
442 | } | |
443 | ||
444 | static void scf_torture_cleanup(void) | |
445 | { | |
446 | int i; | |
447 | ||
448 | if (torture_cleanup_begin()) | |
449 | return; | |
450 | ||
451 | WRITE_ONCE(scfdone, true); | |
452 | if (nthreads) | |
453 | for (i = 0; i < nthreads; i++) | |
454 | torture_stop_kthread("scftorture_invoker", scf_stats_p[i].task); | |
455 | else | |
456 | goto end; | |
e9d338a0 PM |
457 | smp_call_function(scf_cleanup_handler, NULL, 0); |
458 | torture_stop_kthread(scf_torture_stats, scf_torture_stats_task); | |
459 | scf_torture_stats_print(); // -After- the stats thread is stopped! | |
dba3142b PM |
460 | kfree(scf_stats_p); // -After- the last stats print has completed! |
461 | scf_stats_p = NULL; | |
e9d338a0 | 462 | |
dbf83b65 | 463 | if (atomic_read(&n_errs) || atomic_read(&n_mb_in_errs) || atomic_read(&n_mb_out_errs)) |
e9d338a0 PM |
464 | scftorture_print_module_parms("End of test: FAILURE"); |
465 | else if (torture_onoff_failures()) | |
466 | scftorture_print_module_parms("End of test: LOCK_HOTPLUG"); | |
467 | else | |
468 | scftorture_print_module_parms("End of test: SUCCESS"); | |
469 | ||
470 | end: | |
471 | torture_cleanup_end(); | |
472 | } | |
473 | ||
474 | static int __init scf_torture_init(void) | |
475 | { | |
476 | long i; | |
477 | int firsterr = 0; | |
5022b8ac PM |
478 | unsigned long weight_single1 = weight_single; |
479 | unsigned long weight_single_wait1 = weight_single_wait; | |
480 | unsigned long weight_many1 = weight_many; | |
481 | unsigned long weight_many_wait1 = weight_many_wait; | |
482 | unsigned long weight_all1 = weight_all; | |
483 | unsigned long weight_all_wait1 = weight_all_wait; | |
e9d338a0 PM |
484 | |
485 | if (!torture_init_begin(SCFTORT_STRING, verbose)) | |
486 | return -EBUSY; | |
487 | ||
488 | scftorture_print_module_parms("Start of test"); | |
489 | ||
490 | if (weight_single == -1 && weight_single_wait == -1 && | |
5022b8ac | 491 | weight_many == -1 && weight_many_wait == -1 && |
e9d338a0 | 492 | weight_all == -1 && weight_all_wait == -1) { |
5022b8ac PM |
493 | weight_single1 = 2 * nr_cpu_ids; |
494 | weight_single_wait1 = 2 * nr_cpu_ids; | |
495 | weight_many1 = 2; | |
496 | weight_many_wait1 = 2; | |
497 | weight_all1 = 1; | |
498 | weight_all_wait1 = 1; | |
e9d338a0 PM |
499 | } else { |
500 | if (weight_single == -1) | |
5022b8ac | 501 | weight_single1 = 0; |
e9d338a0 | 502 | if (weight_single_wait == -1) |
5022b8ac PM |
503 | weight_single_wait1 = 0; |
504 | if (weight_many == -1) | |
505 | weight_many1 = 0; | |
506 | if (weight_many_wait == -1) | |
507 | weight_many_wait1 = 0; | |
e9d338a0 | 508 | if (weight_all == -1) |
5022b8ac | 509 | weight_all1 = 0; |
e9d338a0 | 510 | if (weight_all_wait == -1) |
5022b8ac | 511 | weight_all_wait1 = 0; |
e9d338a0 | 512 | } |
5022b8ac PM |
513 | if (weight_single1 == 0 && weight_single_wait1 == 0 && |
514 | weight_many1 == 0 && weight_many_wait1 == 0 && | |
515 | weight_all1 == 0 && weight_all_wait1 == 0) { | |
516 | VERBOSE_SCFTORTOUT_ERRSTRING("all zero weights makes no sense"); | |
e9d338a0 PM |
517 | firsterr = -EINVAL; |
518 | goto unwind; | |
519 | } | |
5022b8ac PM |
520 | scf_sel_add(weight_single1, SCF_PRIM_SINGLE, false); |
521 | scf_sel_add(weight_single_wait1, SCF_PRIM_SINGLE, true); | |
522 | scf_sel_add(weight_many1, SCF_PRIM_MANY, false); | |
523 | scf_sel_add(weight_many_wait1, SCF_PRIM_MANY, true); | |
524 | scf_sel_add(weight_all1, SCF_PRIM_ALL, false); | |
525 | scf_sel_add(weight_all_wait1, SCF_PRIM_ALL, true); | |
526 | scf_sel_dump(); | |
e9d338a0 PM |
527 | |
528 | if (onoff_interval > 0) { | |
529 | firsterr = torture_onoff_init(onoff_holdoff * HZ, onoff_interval, NULL); | |
530 | if (firsterr) | |
531 | goto unwind; | |
532 | } | |
533 | if (shutdown_secs > 0) { | |
534 | firsterr = torture_shutdown_init(shutdown_secs, scf_torture_cleanup); | |
535 | if (firsterr) | |
536 | goto unwind; | |
537 | } | |
538 | ||
539 | // Worker tasks invoking smp_call_function(). | |
540 | if (nthreads < 0) | |
541 | nthreads = num_online_cpus(); | |
542 | scf_stats_p = kcalloc(nthreads, sizeof(scf_stats_p[0]), GFP_KERNEL); | |
543 | if (!scf_stats_p) { | |
544 | VERBOSE_SCFTORTOUT_ERRSTRING("out of memory"); | |
545 | firsterr = -ENOMEM; | |
546 | goto unwind; | |
547 | } | |
548 | ||
549 | VERBOSE_SCFTORTOUT("Starting %d smp_call_function() threads\n", nthreads); | |
550 | ||
551 | atomic_set(&n_started, nthreads); | |
552 | for (i = 0; i < nthreads; i++) { | |
553 | scf_stats_p[i].cpu = i; | |
554 | firsterr = torture_create_kthread(scftorture_invoker, (void *)&scf_stats_p[i], | |
555 | scf_stats_p[i].task); | |
556 | if (firsterr) | |
557 | goto unwind; | |
558 | } | |
559 | if (stat_interval > 0) { | |
560 | firsterr = torture_create_kthread(scf_torture_stats, NULL, scf_torture_stats_task); | |
561 | if (firsterr) | |
562 | goto unwind; | |
563 | } | |
564 | ||
565 | torture_init_end(); | |
566 | return 0; | |
567 | ||
568 | unwind: | |
569 | torture_init_end(); | |
570 | scf_torture_cleanup(); | |
571 | return firsterr; | |
572 | } | |
573 | ||
574 | module_init(scf_torture_init); | |
575 | module_exit(scf_torture_cleanup); |