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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."); | |
85558182 | 62 | torture_param(int, stutter, 5, "Number of jiffies to run/halt test, 0=disable"); |
e9d338a0 PM |
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"); | |
1ac78b49 | 65 | torture_param(int, weight_resched, -1, "Testing weight for resched_cpu() operations."); |
e9d338a0 PM |
66 | torture_param(int, weight_single, -1, "Testing weight for single-CPU no-wait operations."); |
67 | torture_param(int, weight_single_wait, -1, "Testing weight for single-CPU operations."); | |
5022b8ac PM |
68 | torture_param(int, weight_many, -1, "Testing weight for multi-CPU no-wait operations."); |
69 | torture_param(int, weight_many_wait, -1, "Testing weight for multi-CPU operations."); | |
e9d338a0 PM |
70 | torture_param(int, weight_all, -1, "Testing weight for all-CPU no-wait operations."); |
71 | torture_param(int, weight_all_wait, -1, "Testing weight for all-CPU operations."); | |
72 | ||
73 | char *torture_type = ""; | |
74 | ||
75 | #ifdef MODULE | |
76 | # define SCFTORT_SHUTDOWN 0 | |
77 | #else | |
78 | # define SCFTORT_SHUTDOWN 1 | |
79 | #endif | |
80 | ||
81 | torture_param(bool, shutdown, SCFTORT_SHUTDOWN, "Shutdown at end of torture test."); | |
82 | ||
83 | struct scf_statistics { | |
84 | struct task_struct *task; | |
85 | int cpu; | |
1ac78b49 | 86 | long long n_resched; |
e9d338a0 | 87 | long long n_single; |
5022b8ac | 88 | long long n_single_ofl; |
e9d338a0 | 89 | long long n_single_wait; |
5022b8ac PM |
90 | long long n_single_wait_ofl; |
91 | long long n_many; | |
92 | long long n_many_wait; | |
e9d338a0 PM |
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 | ||
5022b8ac | 101 | // Data for random primitive selection |
1ac78b49 PM |
102 | #define SCF_PRIM_RESCHED 0 |
103 | #define SCF_PRIM_SINGLE 1 | |
104 | #define SCF_PRIM_MANY 2 | |
105 | #define SCF_PRIM_ALL 3 | |
106 | #define SCF_NPRIMS 7 // Need wait and no-wait versions of each, | |
107 | // except for SCF_PRIM_RESCHED. | |
5022b8ac PM |
108 | |
109 | static char *scf_prim_name[] = { | |
1ac78b49 | 110 | "resched_cpu", |
5022b8ac PM |
111 | "smp_call_function_single", |
112 | "smp_call_function_many", | |
113 | "smp_call_function", | |
114 | }; | |
115 | ||
116 | struct scf_selector { | |
117 | unsigned long scfs_weight; | |
118 | int scfs_prim; | |
119 | bool scfs_wait; | |
120 | }; | |
121 | static struct scf_selector scf_sel_array[SCF_NPRIMS]; | |
122 | static int scf_sel_array_len; | |
123 | static unsigned long scf_sel_totweight; | |
124 | ||
b93e21a5 PM |
125 | // Communicate between caller and handler. |
126 | struct scf_check { | |
127 | bool scfc_in; | |
128 | bool scfc_out; | |
129 | int scfc_cpu; // -1 for not _single(). | |
130 | bool scfc_wait; | |
131 | }; | |
132 | ||
e9d338a0 PM |
133 | // Use to wait for all threads to start. |
134 | static atomic_t n_started; | |
135 | static atomic_t n_errs; | |
b93e21a5 PM |
136 | static atomic_t n_mb_in_errs; |
137 | static atomic_t n_mb_out_errs; | |
138 | static atomic_t n_alloc_errs; | |
e9d338a0 | 139 | static bool scfdone; |
dbf83b65 | 140 | static char *bangstr = ""; |
e9d338a0 | 141 | |
9a52a574 | 142 | static DEFINE_TORTURE_RANDOM_PERCPU(scf_torture_rand); |
e9d338a0 | 143 | |
1ac78b49 PM |
144 | extern void resched_cpu(int cpu); // An alternative IPI vector. |
145 | ||
e9d338a0 PM |
146 | // Print torture statistics. Caller must ensure serialization. |
147 | static void scf_torture_stats_print(void) | |
148 | { | |
149 | int cpu; | |
dba3142b | 150 | int i; |
e9d338a0 PM |
151 | long long invoked_count = 0; |
152 | bool isdone = READ_ONCE(scfdone); | |
dba3142b | 153 | struct scf_statistics scfs = {}; |
e9d338a0 PM |
154 | |
155 | for_each_possible_cpu(cpu) | |
156 | invoked_count += data_race(per_cpu(scf_invoked_count, cpu)); | |
dba3142b | 157 | for (i = 0; i < nthreads; i++) { |
1ac78b49 | 158 | scfs.n_resched += scf_stats_p[i].n_resched; |
dba3142b PM |
159 | scfs.n_single += scf_stats_p[i].n_single; |
160 | scfs.n_single_ofl += scf_stats_p[i].n_single_ofl; | |
161 | scfs.n_single_wait += scf_stats_p[i].n_single_wait; | |
162 | scfs.n_single_wait_ofl += scf_stats_p[i].n_single_wait_ofl; | |
163 | scfs.n_many += scf_stats_p[i].n_many; | |
164 | scfs.n_many_wait += scf_stats_p[i].n_many_wait; | |
165 | scfs.n_all += scf_stats_p[i].n_all; | |
166 | scfs.n_all_wait += scf_stats_p[i].n_all_wait; | |
167 | } | |
dbf83b65 PM |
168 | if (atomic_read(&n_errs) || atomic_read(&n_mb_in_errs) || |
169 | atomic_read(&n_mb_out_errs) || atomic_read(&n_alloc_errs)) | |
170 | bangstr = "!!! "; | |
1ac78b49 PM |
171 | pr_alert("%s %sscf_invoked_count %s: %lld resched: %lld single: %lld/%lld single_ofl: %lld/%lld many: %lld/%lld all: %lld/%lld ", |
172 | SCFTORT_FLAG, bangstr, isdone ? "VER" : "ver", invoked_count, scfs.n_resched, | |
dba3142b PM |
173 | scfs.n_single, scfs.n_single_wait, scfs.n_single_ofl, scfs.n_single_wait_ofl, |
174 | scfs.n_many, scfs.n_many_wait, scfs.n_all, scfs.n_all_wait); | |
e9d338a0 | 175 | torture_onoff_stats(); |
dbf83b65 PM |
176 | pr_cont("ste: %d stnmie: %d stnmoe: %d staf: %d\n", atomic_read(&n_errs), |
177 | atomic_read(&n_mb_in_errs), atomic_read(&n_mb_out_errs), | |
178 | atomic_read(&n_alloc_errs)); | |
e9d338a0 PM |
179 | } |
180 | ||
181 | // Periodically prints torture statistics, if periodic statistics printing | |
182 | // was specified via the stat_interval module parameter. | |
183 | static int | |
184 | scf_torture_stats(void *arg) | |
185 | { | |
186 | VERBOSE_TOROUT_STRING("scf_torture_stats task started"); | |
187 | do { | |
188 | schedule_timeout_interruptible(stat_interval * HZ); | |
189 | scf_torture_stats_print(); | |
190 | torture_shutdown_absorb("scf_torture_stats"); | |
191 | } while (!torture_must_stop()); | |
192 | torture_kthread_stopping("scf_torture_stats"); | |
193 | return 0; | |
194 | } | |
195 | ||
5022b8ac PM |
196 | // Add a primitive to the scf_sel_array[]. |
197 | static void scf_sel_add(unsigned long weight, int prim, bool wait) | |
198 | { | |
199 | struct scf_selector *scfsp = &scf_sel_array[scf_sel_array_len]; | |
200 | ||
201 | // If no weight, if array would overflow, if computing three-place | |
202 | // percentages would overflow, or if the scf_prim_name[] array would | |
203 | // overflow, don't bother. In the last three two cases, complain. | |
204 | if (!weight || | |
205 | WARN_ON_ONCE(scf_sel_array_len >= ARRAY_SIZE(scf_sel_array)) || | |
206 | WARN_ON_ONCE(0 - 100000 * weight <= 100000 * scf_sel_totweight) || | |
207 | WARN_ON_ONCE(prim >= ARRAY_SIZE(scf_prim_name))) | |
208 | return; | |
209 | scf_sel_totweight += weight; | |
210 | scfsp->scfs_weight = scf_sel_totweight; | |
211 | scfsp->scfs_prim = prim; | |
212 | scfsp->scfs_wait = wait; | |
213 | scf_sel_array_len++; | |
214 | } | |
215 | ||
216 | // Dump out weighting percentages for scf_prim_name[] array. | |
217 | static void scf_sel_dump(void) | |
218 | { | |
219 | int i; | |
220 | unsigned long oldw = 0; | |
221 | struct scf_selector *scfsp; | |
222 | unsigned long w; | |
223 | ||
224 | for (i = 0; i < scf_sel_array_len; i++) { | |
225 | scfsp = &scf_sel_array[i]; | |
226 | w = (scfsp->scfs_weight - oldw) * 100000 / scf_sel_totweight; | |
227 | pr_info("%s: %3lu.%03lu %s(%s)\n", __func__, w / 1000, w % 1000, | |
228 | scf_prim_name[scfsp->scfs_prim], | |
229 | scfsp->scfs_wait ? "wait" : "nowait"); | |
230 | oldw = scfsp->scfs_weight; | |
231 | } | |
232 | } | |
233 | ||
234 | // Randomly pick a primitive and wait/nowait, based on weightings. | |
235 | static struct scf_selector *scf_sel_rand(struct torture_random_state *trsp) | |
236 | { | |
237 | int i; | |
238 | unsigned long w = torture_random(trsp) % (scf_sel_totweight + 1); | |
239 | ||
240 | for (i = 0; i < scf_sel_array_len; i++) | |
241 | if (scf_sel_array[i].scfs_weight >= w) | |
242 | return &scf_sel_array[i]; | |
243 | WARN_ON_ONCE(1); | |
244 | return &scf_sel_array[0]; | |
245 | } | |
246 | ||
e9d338a0 PM |
247 | // Update statistics and occasionally burn up mass quantities of CPU time, |
248 | // if told to do so via scftorture.longwait. Otherwise, occasionally burn | |
249 | // a little bit. | |
b93e21a5 | 250 | static void scf_handler(void *scfc_in) |
e9d338a0 PM |
251 | { |
252 | int i; | |
253 | int j; | |
254 | unsigned long r = torture_random(this_cpu_ptr(&scf_torture_rand)); | |
b93e21a5 | 255 | struct scf_check *scfcp = scfc_in; |
e9d338a0 | 256 | |
980205ee PM |
257 | if (likely(scfcp)) { |
258 | WRITE_ONCE(scfcp->scfc_out, false); // For multiple receivers. | |
259 | if (WARN_ON_ONCE(unlikely(!READ_ONCE(scfcp->scfc_in)))) | |
260 | atomic_inc(&n_mb_in_errs); | |
261 | } | |
e9d338a0 PM |
262 | this_cpu_inc(scf_invoked_count); |
263 | if (longwait <= 0) { | |
264 | if (!(r & 0xffc0)) | |
265 | udelay(r & 0x3f); | |
b93e21a5 | 266 | goto out; |
e9d338a0 PM |
267 | } |
268 | if (r & 0xfff) | |
b93e21a5 | 269 | goto out; |
e9d338a0 PM |
270 | r = (r >> 12); |
271 | if (longwait <= 0) { | |
272 | udelay((r & 0xff) + 1); | |
b93e21a5 | 273 | goto out; |
e9d338a0 PM |
274 | } |
275 | r = r % longwait + 1; | |
276 | for (i = 0; i < r; i++) { | |
277 | for (j = 0; j < 1000; j++) { | |
278 | udelay(1000); | |
279 | cpu_relax(); | |
280 | } | |
281 | } | |
b93e21a5 PM |
282 | out: |
283 | if (unlikely(!scfcp)) | |
284 | return; | |
285 | if (scfcp->scfc_wait) | |
286 | WRITE_ONCE(scfcp->scfc_out, true); | |
287 | else | |
288 | kfree(scfcp); | |
e9d338a0 PM |
289 | } |
290 | ||
5022b8ac | 291 | // As above, but check for correct CPU. |
b93e21a5 | 292 | static void scf_handler_1(void *scfc_in) |
5022b8ac | 293 | { |
b93e21a5 PM |
294 | struct scf_check *scfcp = scfc_in; |
295 | ||
296 | 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 | 297 | atomic_inc(&n_errs); |
b93e21a5 PM |
298 | } |
299 | scf_handler(scfcp); | |
5022b8ac PM |
300 | } |
301 | ||
e9d338a0 | 302 | // Randomly do an smp_call_function*() invocation. |
5022b8ac | 303 | static void scftorture_invoke_one(struct scf_statistics *scfp, struct torture_random_state *trsp) |
e9d338a0 | 304 | { |
5022b8ac | 305 | uintptr_t cpu; |
676e5469 | 306 | int ret = 0; |
b93e21a5 | 307 | struct scf_check *scfcp = NULL; |
5022b8ac PM |
308 | struct scf_selector *scfsp = scf_sel_rand(trsp); |
309 | ||
e9d338a0 PM |
310 | if (use_cpus_read_lock) |
311 | cpus_read_lock(); | |
312 | else | |
313 | preempt_disable(); | |
34e8c483 | 314 | if (scfsp->scfs_prim == SCF_PRIM_SINGLE || scfsp->scfs_wait) { |
b93e21a5 | 315 | scfcp = kmalloc(sizeof(*scfcp), GFP_ATOMIC); |
4df55bdd | 316 | if (WARN_ON_ONCE(!scfcp)) { |
b93e21a5 | 317 | atomic_inc(&n_alloc_errs); |
4df55bdd PM |
318 | } else { |
319 | scfcp->scfc_cpu = -1; | |
320 | scfcp->scfc_wait = scfsp->scfs_wait; | |
321 | scfcp->scfc_out = false; | |
322 | } | |
34e8c483 PM |
323 | } |
324 | switch (scfsp->scfs_prim) { | |
1ac78b49 PM |
325 | case SCF_PRIM_RESCHED: |
326 | if (IS_BUILTIN(CONFIG_SCF_TORTURE_TEST)) { | |
327 | cpu = torture_random(trsp) % nr_cpu_ids; | |
328 | scfp->n_resched++; | |
329 | resched_cpu(cpu); | |
330 | } | |
331 | break; | |
34e8c483 | 332 | case SCF_PRIM_SINGLE: |
5022b8ac PM |
333 | cpu = torture_random(trsp) % nr_cpu_ids; |
334 | if (scfsp->scfs_wait) | |
335 | scfp->n_single_wait++; | |
336 | else | |
337 | scfp->n_single++; | |
b93e21a5 PM |
338 | if (scfcp) { |
339 | scfcp->scfc_cpu = cpu; | |
ee7035d2 | 340 | barrier(); // Prevent race-reduction compiler optimizations. |
b93e21a5 PM |
341 | scfcp->scfc_in = true; |
342 | } | |
343 | ret = smp_call_function_single(cpu, scf_handler_1, (void *)scfcp, scfsp->scfs_wait); | |
5022b8ac PM |
344 | if (ret) { |
345 | if (scfsp->scfs_wait) | |
346 | scfp->n_single_wait_ofl++; | |
347 | else | |
348 | scfp->n_single_ofl++; | |
b93e21a5 | 349 | kfree(scfcp); |
676e5469 | 350 | scfcp = NULL; |
5022b8ac PM |
351 | } |
352 | break; | |
353 | case SCF_PRIM_MANY: | |
354 | if (scfsp->scfs_wait) | |
355 | scfp->n_many_wait++; | |
356 | else | |
357 | scfp->n_many++; | |
ee7035d2 PM |
358 | if (scfcp) { |
359 | barrier(); // Prevent race-reduction compiler optimizations. | |
980205ee | 360 | scfcp->scfc_in = true; |
ee7035d2 | 361 | } |
980205ee | 362 | smp_call_function_many(cpu_online_mask, scf_handler, scfcp, scfsp->scfs_wait); |
5022b8ac PM |
363 | break; |
364 | case SCF_PRIM_ALL: | |
365 | if (scfsp->scfs_wait) | |
366 | scfp->n_all_wait++; | |
367 | else | |
368 | scfp->n_all++; | |
ee7035d2 PM |
369 | if (scfcp) { |
370 | barrier(); // Prevent race-reduction compiler optimizations. | |
34e8c483 | 371 | scfcp->scfc_in = true; |
ee7035d2 | 372 | } |
34e8c483 | 373 | smp_call_function(scf_handler, scfcp, scfsp->scfs_wait); |
5022b8ac | 374 | break; |
de77d4da PM |
375 | default: |
376 | WARN_ON_ONCE(1); | |
377 | if (scfcp) | |
378 | scfcp->scfc_out = true; | |
5022b8ac | 379 | } |
676e5469 | 380 | if (scfcp && scfsp->scfs_wait) { |
9e66bf03 PM |
381 | if (WARN_ON_ONCE((num_online_cpus() > 1 || scfsp->scfs_prim == SCF_PRIM_SINGLE) && |
382 | !scfcp->scfc_out)) | |
676e5469 PM |
383 | atomic_inc(&n_mb_out_errs); // Leak rather than trash! |
384 | else | |
385 | kfree(scfcp); | |
ee7035d2 | 386 | barrier(); // Prevent race-reduction compiler optimizations. |
676e5469 | 387 | } |
e9d338a0 PM |
388 | if (use_cpus_read_lock) |
389 | cpus_read_unlock(); | |
390 | else | |
391 | preempt_enable(); | |
392 | if (!(torture_random(trsp) & 0xfff)) | |
393 | schedule_timeout_uninterruptible(1); | |
394 | } | |
395 | ||
396 | // SCF test kthread. Repeatedly does calls to members of the | |
397 | // smp_call_function() family of functions. | |
398 | static int scftorture_invoker(void *arg) | |
399 | { | |
a7c072ef | 400 | int cpu; |
e9d338a0 PM |
401 | DEFINE_TORTURE_RANDOM(rand); |
402 | struct scf_statistics *scfp = (struct scf_statistics *)arg; | |
a7c072ef | 403 | bool was_offline = false; |
e9d338a0 PM |
404 | |
405 | VERBOSE_SCFTORTOUT("scftorture_invoker %d: task started", scfp->cpu); | |
a7c072ef PM |
406 | cpu = scfp->cpu % nr_cpu_ids; |
407 | set_cpus_allowed_ptr(current, cpumask_of(cpu)); | |
e9d338a0 PM |
408 | set_user_nice(current, MAX_NICE); |
409 | if (holdoff) | |
410 | schedule_timeout_interruptible(holdoff * HZ); | |
411 | ||
412 | VERBOSE_SCFTORTOUT("scftorture_invoker %d: Waiting for all SCF torturers from cpu %d", scfp->cpu, smp_processor_id()); | |
413 | ||
414 | // Make sure that the CPU is affinitized appropriately during testing. | |
415 | WARN_ON_ONCE(smp_processor_id() != scfp->cpu); | |
416 | ||
417 | if (!atomic_dec_return(&n_started)) | |
418 | while (atomic_read_acquire(&n_started)) { | |
419 | if (torture_must_stop()) { | |
420 | VERBOSE_SCFTORTOUT("scftorture_invoker %d ended before starting", scfp->cpu); | |
421 | goto end; | |
422 | } | |
423 | schedule_timeout_uninterruptible(1); | |
424 | } | |
425 | ||
426 | VERBOSE_SCFTORTOUT("scftorture_invoker %d started", scfp->cpu); | |
427 | ||
428 | do { | |
429 | scftorture_invoke_one(scfp, &rand); | |
a7c072ef PM |
430 | while (cpu_is_offline(cpu) && !torture_must_stop()) { |
431 | schedule_timeout_interruptible(HZ / 5); | |
432 | was_offline = true; | |
433 | } | |
434 | if (was_offline) { | |
435 | set_cpus_allowed_ptr(current, cpumask_of(cpu)); | |
436 | was_offline = false; | |
437 | } | |
65bd77f5 | 438 | cond_resched(); |
85558182 | 439 | stutter_wait("scftorture_invoker"); |
e9d338a0 PM |
440 | } while (!torture_must_stop()); |
441 | ||
442 | VERBOSE_SCFTORTOUT("scftorture_invoker %d ended", scfp->cpu); | |
443 | end: | |
444 | torture_kthread_stopping("scftorture_invoker"); | |
445 | return 0; | |
446 | } | |
447 | ||
448 | static void | |
449 | scftorture_print_module_parms(const char *tag) | |
450 | { | |
451 | pr_alert(SCFTORT_FLAG | |
85558182 PM |
452 | "--- %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_wait=%d, weight_many=%d, weight_many_wait=%d, weight_all=%d, weight_all_wait=%d\n", tag, |
453 | verbose, holdoff, longwait, nthreads, onoff_holdoff, onoff_interval, shutdown, stat_interval, stutter, use_cpus_read_lock, weight_resched, weight_single, weight_single_wait, weight_many, weight_many_wait, weight_all, weight_all_wait); | |
e9d338a0 PM |
454 | } |
455 | ||
456 | static void scf_cleanup_handler(void *unused) | |
457 | { | |
458 | } | |
459 | ||
460 | static void scf_torture_cleanup(void) | |
461 | { | |
462 | int i; | |
463 | ||
464 | if (torture_cleanup_begin()) | |
465 | return; | |
466 | ||
467 | WRITE_ONCE(scfdone, true); | |
468 | if (nthreads) | |
469 | for (i = 0; i < nthreads; i++) | |
470 | torture_stop_kthread("scftorture_invoker", scf_stats_p[i].task); | |
471 | else | |
472 | goto end; | |
e9d338a0 PM |
473 | smp_call_function(scf_cleanup_handler, NULL, 0); |
474 | torture_stop_kthread(scf_torture_stats, scf_torture_stats_task); | |
475 | scf_torture_stats_print(); // -After- the stats thread is stopped! | |
dba3142b PM |
476 | kfree(scf_stats_p); // -After- the last stats print has completed! |
477 | scf_stats_p = NULL; | |
e9d338a0 | 478 | |
dbf83b65 | 479 | if (atomic_read(&n_errs) || atomic_read(&n_mb_in_errs) || atomic_read(&n_mb_out_errs)) |
e9d338a0 PM |
480 | scftorture_print_module_parms("End of test: FAILURE"); |
481 | else if (torture_onoff_failures()) | |
482 | scftorture_print_module_parms("End of test: LOCK_HOTPLUG"); | |
483 | else | |
484 | scftorture_print_module_parms("End of test: SUCCESS"); | |
485 | ||
486 | end: | |
487 | torture_cleanup_end(); | |
488 | } | |
489 | ||
490 | static int __init scf_torture_init(void) | |
491 | { | |
492 | long i; | |
493 | int firsterr = 0; | |
1ac78b49 | 494 | unsigned long weight_resched1 = weight_resched; |
5022b8ac PM |
495 | unsigned long weight_single1 = weight_single; |
496 | unsigned long weight_single_wait1 = weight_single_wait; | |
497 | unsigned long weight_many1 = weight_many; | |
498 | unsigned long weight_many_wait1 = weight_many_wait; | |
499 | unsigned long weight_all1 = weight_all; | |
500 | unsigned long weight_all_wait1 = weight_all_wait; | |
e9d338a0 PM |
501 | |
502 | if (!torture_init_begin(SCFTORT_STRING, verbose)) | |
503 | return -EBUSY; | |
504 | ||
505 | scftorture_print_module_parms("Start of test"); | |
506 | ||
1ac78b49 | 507 | if (weight_resched == -1 && weight_single == -1 && weight_single_wait == -1 && |
5022b8ac | 508 | weight_many == -1 && weight_many_wait == -1 && |
e9d338a0 | 509 | weight_all == -1 && weight_all_wait == -1) { |
1ac78b49 | 510 | weight_resched1 = 2 * nr_cpu_ids; |
5022b8ac PM |
511 | weight_single1 = 2 * nr_cpu_ids; |
512 | weight_single_wait1 = 2 * nr_cpu_ids; | |
513 | weight_many1 = 2; | |
514 | weight_many_wait1 = 2; | |
515 | weight_all1 = 1; | |
516 | weight_all_wait1 = 1; | |
e9d338a0 | 517 | } else { |
1ac78b49 PM |
518 | if (weight_resched == -1) |
519 | weight_resched1 = 0; | |
e9d338a0 | 520 | if (weight_single == -1) |
5022b8ac | 521 | weight_single1 = 0; |
e9d338a0 | 522 | if (weight_single_wait == -1) |
5022b8ac PM |
523 | weight_single_wait1 = 0; |
524 | if (weight_many == -1) | |
525 | weight_many1 = 0; | |
526 | if (weight_many_wait == -1) | |
527 | weight_many_wait1 = 0; | |
e9d338a0 | 528 | if (weight_all == -1) |
5022b8ac | 529 | weight_all1 = 0; |
e9d338a0 | 530 | if (weight_all_wait == -1) |
5022b8ac | 531 | weight_all_wait1 = 0; |
e9d338a0 | 532 | } |
5022b8ac PM |
533 | if (weight_single1 == 0 && weight_single_wait1 == 0 && |
534 | weight_many1 == 0 && weight_many_wait1 == 0 && | |
535 | weight_all1 == 0 && weight_all_wait1 == 0) { | |
536 | VERBOSE_SCFTORTOUT_ERRSTRING("all zero weights makes no sense"); | |
e9d338a0 PM |
537 | firsterr = -EINVAL; |
538 | goto unwind; | |
539 | } | |
1ac78b49 PM |
540 | if (IS_BUILTIN(CONFIG_SCF_TORTURE_TEST)) |
541 | scf_sel_add(weight_resched1, SCF_PRIM_RESCHED, false); | |
542 | else if (weight_resched1) | |
543 | VERBOSE_SCFTORTOUT_ERRSTRING("built as module, weight_resched ignored"); | |
5022b8ac PM |
544 | scf_sel_add(weight_single1, SCF_PRIM_SINGLE, false); |
545 | scf_sel_add(weight_single_wait1, SCF_PRIM_SINGLE, true); | |
546 | scf_sel_add(weight_many1, SCF_PRIM_MANY, false); | |
547 | scf_sel_add(weight_many_wait1, SCF_PRIM_MANY, true); | |
548 | scf_sel_add(weight_all1, SCF_PRIM_ALL, false); | |
549 | scf_sel_add(weight_all_wait1, SCF_PRIM_ALL, true); | |
550 | scf_sel_dump(); | |
e9d338a0 PM |
551 | |
552 | if (onoff_interval > 0) { | |
553 | firsterr = torture_onoff_init(onoff_holdoff * HZ, onoff_interval, NULL); | |
554 | if (firsterr) | |
555 | goto unwind; | |
556 | } | |
557 | if (shutdown_secs > 0) { | |
558 | firsterr = torture_shutdown_init(shutdown_secs, scf_torture_cleanup); | |
559 | if (firsterr) | |
560 | goto unwind; | |
561 | } | |
85558182 PM |
562 | if (stutter > 0) { |
563 | firsterr = torture_stutter_init(stutter, stutter); | |
564 | if (firsterr) | |
565 | goto unwind; | |
566 | } | |
e9d338a0 PM |
567 | |
568 | // Worker tasks invoking smp_call_function(). | |
569 | if (nthreads < 0) | |
570 | nthreads = num_online_cpus(); | |
571 | scf_stats_p = kcalloc(nthreads, sizeof(scf_stats_p[0]), GFP_KERNEL); | |
572 | if (!scf_stats_p) { | |
573 | VERBOSE_SCFTORTOUT_ERRSTRING("out of memory"); | |
574 | firsterr = -ENOMEM; | |
575 | goto unwind; | |
576 | } | |
577 | ||
578 | VERBOSE_SCFTORTOUT("Starting %d smp_call_function() threads\n", nthreads); | |
579 | ||
580 | atomic_set(&n_started, nthreads); | |
581 | for (i = 0; i < nthreads; i++) { | |
582 | scf_stats_p[i].cpu = i; | |
583 | firsterr = torture_create_kthread(scftorture_invoker, (void *)&scf_stats_p[i], | |
584 | scf_stats_p[i].task); | |
585 | if (firsterr) | |
586 | goto unwind; | |
587 | } | |
588 | if (stat_interval > 0) { | |
589 | firsterr = torture_create_kthread(scf_torture_stats, NULL, scf_torture_stats_task); | |
590 | if (firsterr) | |
591 | goto unwind; | |
592 | } | |
593 | ||
594 | torture_init_end(); | |
595 | return 0; | |
596 | ||
597 | unwind: | |
598 | torture_init_end(); | |
599 | scf_torture_cleanup(); | |
600 | return firsterr; | |
601 | } | |
602 | ||
603 | module_init(scf_torture_init); | |
604 | module_exit(scf_torture_cleanup); |