1 | // SPDX-License-Identifier: GPL-2.0+ |
2 | // |
3 | // Torture test for smp_call_function() and friends. |
4 | // |
5 | // Copyright (C) Facebook, 2020. |
6 | // |
7 | // Author: Paul E. McKenney <paulmck@kernel.org> |
8 | |
9 | #define pr_fmt(fmt) fmt |
10 | |
11 | #include <linux/atomic.h> |
12 | #include <linux/bitops.h> |
13 | #include <linux/completion.h> |
14 | #include <linux/cpu.h> |
15 | #include <linux/delay.h> |
16 | #include <linux/err.h> |
17 | #include <linux/init.h> |
18 | #include <linux/interrupt.h> |
19 | #include <linux/kthread.h> |
20 | #include <linux/kernel.h> |
21 | #include <linux/mm.h> |
22 | #include <linux/module.h> |
23 | #include <linux/moduleparam.h> |
24 | #include <linux/notifier.h> |
25 | #include <linux/percpu.h> |
26 | #include <linux/rcupdate.h> |
27 | #include <linux/rcupdate_trace.h> |
28 | #include <linux/reboot.h> |
29 | #include <linux/sched.h> |
30 | #include <linux/spinlock.h> |
31 | #include <linux/smp.h> |
32 | #include <linux/stat.h> |
33 | #include <linux/srcu.h> |
34 | #include <linux/slab.h> |
35 | #include <linux/torture.h> |
36 | #include <linux/types.h> |
37 | |
38 | #define SCFTORT_STRING "scftorture" |
39 | #define SCFTORT_FLAG SCFTORT_STRING ": " |
40 | |
41 | #define VERBOSE_SCFTORTOUT(s, x...) \ |
42 | do { if (verbose) pr_alert(SCFTORT_FLAG s "\n", ## x); } while (0) |
43 | |
44 | #define SCFTORTOUT_ERRSTRING(s, x...) pr_alert(SCFTORT_FLAG "!!! " s "\n", ## x) |
45 | |
46 | MODULE_LICENSE("GPL" ); |
47 | MODULE_AUTHOR("Paul E. McKenney <paulmck@kernel.org>" ); |
48 | |
49 | // Wait until there are multiple CPUs before starting test. |
50 | torture_param(int, holdoff, IS_BUILTIN(CONFIG_SCF_TORTURE_TEST) ? 10 : 0, |
51 | "Holdoff time before test start (s)" ); |
52 | torture_param(int, longwait, 0, "Include ridiculously long waits? (seconds)" ); |
53 | torture_param(int, nthreads, -1, "# threads, defaults to -1 for all CPUs." ); |
54 | torture_param(int, onoff_holdoff, 0, "Time after boot before CPU hotplugs (s)" ); |
55 | torture_param(int, onoff_interval, 0, "Time between CPU hotplugs (s), 0=disable" ); |
56 | torture_param(int, shutdown_secs, 0, "Shutdown time (ms), <= zero to disable." ); |
57 | torture_param(int, stat_interval, 60, "Number of seconds between stats printk()s." ); |
58 | torture_param(int, stutter, 5, "Number of jiffies to run/halt test, 0=disable" ); |
59 | torture_param(bool, use_cpus_read_lock, 0, "Use cpus_read_lock() to exclude CPU hotplug." ); |
60 | torture_param(int, verbose, 0, "Enable verbose debugging printk()s" ); |
61 | torture_param(int, weight_resched, -1, "Testing weight for resched_cpu() operations." ); |
62 | torture_param(int, weight_single, -1, "Testing weight for single-CPU no-wait operations." ); |
63 | torture_param(int, weight_single_rpc, -1, "Testing weight for single-CPU RPC operations." ); |
64 | torture_param(int, weight_single_wait, -1, "Testing weight for single-CPU operations." ); |
65 | torture_param(int, weight_many, -1, "Testing weight for multi-CPU no-wait operations." ); |
66 | torture_param(int, weight_many_wait, -1, "Testing weight for multi-CPU operations." ); |
67 | torture_param(int, weight_all, -1, "Testing weight for all-CPU no-wait operations." ); |
68 | torture_param(int, weight_all_wait, -1, "Testing weight for all-CPU operations." ); |
69 | |
70 | char *torture_type = "" ; |
71 | |
72 | #ifdef MODULE |
73 | # define SCFTORT_SHUTDOWN 0 |
74 | #else |
75 | # define SCFTORT_SHUTDOWN 1 |
76 | #endif |
77 | |
78 | torture_param(bool, shutdown, SCFTORT_SHUTDOWN, "Shutdown at end of torture test." ); |
79 | |
80 | struct scf_statistics { |
81 | struct task_struct *task; |
82 | int cpu; |
83 | long long n_resched; |
84 | long long n_single; |
85 | long long n_single_ofl; |
86 | long long n_single_rpc; |
87 | long long n_single_rpc_ofl; |
88 | long long n_single_wait; |
89 | long long n_single_wait_ofl; |
90 | long long n_many; |
91 | long long n_many_wait; |
92 | long long n_all; |
93 | long long n_all_wait; |
94 | }; |
95 | |
96 | static struct scf_statistics *scf_stats_p; |
97 | static struct task_struct *scf_torture_stats_task; |
98 | static DEFINE_PER_CPU(long long, scf_invoked_count); |
99 | |
100 | // Data for random primitive selection |
101 | #define SCF_PRIM_RESCHED 0 |
102 | #define SCF_PRIM_SINGLE 1 |
103 | #define SCF_PRIM_SINGLE_RPC 2 |
104 | #define SCF_PRIM_MANY 3 |
105 | #define SCF_PRIM_ALL 4 |
106 | #define SCF_NPRIMS 8 // Need wait and no-wait versions of each, |
107 | // except for SCF_PRIM_RESCHED and |
108 | // SCF_PRIM_SINGLE_RPC. |
109 | |
110 | static char *scf_prim_name[] = { |
111 | "resched_cpu" , |
112 | "smp_call_function_single" , |
113 | "smp_call_function_single_rpc" , |
114 | "smp_call_function_many" , |
115 | "smp_call_function" , |
116 | }; |
117 | |
118 | struct scf_selector { |
119 | unsigned long scfs_weight; |
120 | int scfs_prim; |
121 | bool scfs_wait; |
122 | }; |
123 | static struct scf_selector scf_sel_array[SCF_NPRIMS]; |
124 | static int scf_sel_array_len; |
125 | static unsigned long scf_sel_totweight; |
126 | |
127 | // Communicate between caller and handler. |
128 | struct scf_check { |
129 | bool scfc_in; |
130 | bool scfc_out; |
131 | int scfc_cpu; // -1 for not _single(). |
132 | bool scfc_wait; |
133 | bool scfc_rpc; |
134 | struct completion scfc_completion; |
135 | }; |
136 | |
137 | // Use to wait for all threads to start. |
138 | static atomic_t n_started; |
139 | static atomic_t n_errs; |
140 | static atomic_t n_mb_in_errs; |
141 | static atomic_t n_mb_out_errs; |
142 | static atomic_t n_alloc_errs; |
143 | static bool scfdone; |
144 | static char *bangstr = "" ; |
145 | |
146 | static DEFINE_TORTURE_RANDOM_PERCPU(scf_torture_rand); |
147 | |
148 | extern void resched_cpu(int cpu); // An alternative IPI vector. |
149 | |
150 | // Print torture statistics. Caller must ensure serialization. |
151 | static void scf_torture_stats_print(void) |
152 | { |
153 | int cpu; |
154 | int i; |
155 | long long invoked_count = 0; |
156 | bool isdone = READ_ONCE(scfdone); |
157 | struct scf_statistics scfs = {}; |
158 | |
159 | for_each_possible_cpu(cpu) |
160 | invoked_count += data_race(per_cpu(scf_invoked_count, cpu)); |
161 | for (i = 0; i < nthreads; i++) { |
162 | scfs.n_resched += scf_stats_p[i].n_resched; |
163 | scfs.n_single += scf_stats_p[i].n_single; |
164 | scfs.n_single_ofl += scf_stats_p[i].n_single_ofl; |
165 | scfs.n_single_rpc += scf_stats_p[i].n_single_rpc; |
166 | scfs.n_single_wait += scf_stats_p[i].n_single_wait; |
167 | scfs.n_single_wait_ofl += scf_stats_p[i].n_single_wait_ofl; |
168 | scfs.n_many += scf_stats_p[i].n_many; |
169 | scfs.n_many_wait += scf_stats_p[i].n_many_wait; |
170 | scfs.n_all += scf_stats_p[i].n_all; |
171 | scfs.n_all_wait += scf_stats_p[i].n_all_wait; |
172 | } |
173 | if (atomic_read(v: &n_errs) || atomic_read(v: &n_mb_in_errs) || |
174 | atomic_read(v: &n_mb_out_errs) || |
175 | (!IS_ENABLED(CONFIG_KASAN) && atomic_read(v: &n_alloc_errs))) |
176 | bangstr = "!!! " ; |
177 | 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 " , |
178 | SCFTORT_FLAG, bangstr, isdone ? "VER" : "ver" , invoked_count, scfs.n_resched, |
179 | scfs.n_single, scfs.n_single_wait, scfs.n_single_ofl, scfs.n_single_wait_ofl, |
180 | scfs.n_single_rpc, scfs.n_single_rpc_ofl, |
181 | scfs.n_many, scfs.n_many_wait, scfs.n_all, scfs.n_all_wait); |
182 | torture_onoff_stats(); |
183 | pr_cont("ste: %d stnmie: %d stnmoe: %d staf: %d\n" , atomic_read(&n_errs), |
184 | atomic_read(&n_mb_in_errs), atomic_read(&n_mb_out_errs), |
185 | atomic_read(&n_alloc_errs)); |
186 | } |
187 | |
188 | // Periodically prints torture statistics, if periodic statistics printing |
189 | // was specified via the stat_interval module parameter. |
190 | static int |
191 | scf_torture_stats(void *arg) |
192 | { |
193 | VERBOSE_TOROUT_STRING("scf_torture_stats task started" ); |
194 | do { |
195 | schedule_timeout_interruptible(timeout: stat_interval * HZ); |
196 | scf_torture_stats_print(); |
197 | torture_shutdown_absorb(title: "scf_torture_stats" ); |
198 | } while (!torture_must_stop()); |
199 | torture_kthread_stopping(title: "scf_torture_stats" ); |
200 | return 0; |
201 | } |
202 | |
203 | // Add a primitive to the scf_sel_array[]. |
204 | static void scf_sel_add(unsigned long weight, int prim, bool wait) |
205 | { |
206 | struct scf_selector *scfsp = &scf_sel_array[scf_sel_array_len]; |
207 | |
208 | // If no weight, if array would overflow, if computing three-place |
209 | // percentages would overflow, or if the scf_prim_name[] array would |
210 | // overflow, don't bother. In the last three two cases, complain. |
211 | if (!weight || |
212 | WARN_ON_ONCE(scf_sel_array_len >= ARRAY_SIZE(scf_sel_array)) || |
213 | WARN_ON_ONCE(0 - 100000 * weight <= 100000 * scf_sel_totweight) || |
214 | WARN_ON_ONCE(prim >= ARRAY_SIZE(scf_prim_name))) |
215 | return; |
216 | scf_sel_totweight += weight; |
217 | scfsp->scfs_weight = scf_sel_totweight; |
218 | scfsp->scfs_prim = prim; |
219 | scfsp->scfs_wait = wait; |
220 | scf_sel_array_len++; |
221 | } |
222 | |
223 | // Dump out weighting percentages for scf_prim_name[] array. |
224 | static void scf_sel_dump(void) |
225 | { |
226 | int i; |
227 | unsigned long oldw = 0; |
228 | struct scf_selector *scfsp; |
229 | unsigned long w; |
230 | |
231 | for (i = 0; i < scf_sel_array_len; i++) { |
232 | scfsp = &scf_sel_array[i]; |
233 | w = (scfsp->scfs_weight - oldw) * 100000 / scf_sel_totweight; |
234 | pr_info("%s: %3lu.%03lu %s(%s)\n" , __func__, w / 1000, w % 1000, |
235 | scf_prim_name[scfsp->scfs_prim], |
236 | scfsp->scfs_wait ? "wait" : "nowait" ); |
237 | oldw = scfsp->scfs_weight; |
238 | } |
239 | } |
240 | |
241 | // Randomly pick a primitive and wait/nowait, based on weightings. |
242 | static struct scf_selector *scf_sel_rand(struct torture_random_state *trsp) |
243 | { |
244 | int i; |
245 | unsigned long w = torture_random(trsp) % (scf_sel_totweight + 1); |
246 | |
247 | for (i = 0; i < scf_sel_array_len; i++) |
248 | if (scf_sel_array[i].scfs_weight >= w) |
249 | return &scf_sel_array[i]; |
250 | WARN_ON_ONCE(1); |
251 | return &scf_sel_array[0]; |
252 | } |
253 | |
254 | // Update statistics and occasionally burn up mass quantities of CPU time, |
255 | // if told to do so via scftorture.longwait. Otherwise, occasionally burn |
256 | // a little bit. |
257 | static void scf_handler(void *scfc_in) |
258 | { |
259 | int i; |
260 | int j; |
261 | unsigned long r = torture_random(this_cpu_ptr(&scf_torture_rand)); |
262 | struct scf_check *scfcp = scfc_in; |
263 | |
264 | if (likely(scfcp)) { |
265 | WRITE_ONCE(scfcp->scfc_out, false); // For multiple receivers. |
266 | if (WARN_ON_ONCE(unlikely(!READ_ONCE(scfcp->scfc_in)))) |
267 | atomic_inc(v: &n_mb_in_errs); |
268 | } |
269 | this_cpu_inc(scf_invoked_count); |
270 | if (longwait <= 0) { |
271 | if (!(r & 0xffc0)) { |
272 | udelay(r & 0x3f); |
273 | goto out; |
274 | } |
275 | } |
276 | if (r & 0xfff) |
277 | goto out; |
278 | r = (r >> 12); |
279 | if (longwait <= 0) { |
280 | udelay((r & 0xff) + 1); |
281 | goto out; |
282 | } |
283 | r = r % longwait + 1; |
284 | for (i = 0; i < r; i++) { |
285 | for (j = 0; j < 1000; j++) { |
286 | udelay(1000); |
287 | cpu_relax(); |
288 | } |
289 | } |
290 | out: |
291 | if (unlikely(!scfcp)) |
292 | return; |
293 | if (scfcp->scfc_wait) { |
294 | WRITE_ONCE(scfcp->scfc_out, true); |
295 | if (scfcp->scfc_rpc) |
296 | complete(&scfcp->scfc_completion); |
297 | } else { |
298 | kfree(objp: scfcp); |
299 | } |
300 | } |
301 | |
302 | // As above, but check for correct CPU. |
303 | static void scf_handler_1(void *scfc_in) |
304 | { |
305 | struct scf_check *scfcp = scfc_in; |
306 | |
307 | 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())) { |
308 | atomic_inc(v: &n_errs); |
309 | } |
310 | scf_handler(scfc_in: scfcp); |
311 | } |
312 | |
313 | // Randomly do an smp_call_function*() invocation. |
314 | static void scftorture_invoke_one(struct scf_statistics *scfp, struct torture_random_state *trsp) |
315 | { |
316 | bool allocfail = false; |
317 | uintptr_t cpu; |
318 | int ret = 0; |
319 | struct scf_check *scfcp = NULL; |
320 | struct scf_selector *scfsp = scf_sel_rand(trsp); |
321 | |
322 | if (use_cpus_read_lock) |
323 | cpus_read_lock(); |
324 | else |
325 | preempt_disable(); |
326 | if (scfsp->scfs_prim == SCF_PRIM_SINGLE || scfsp->scfs_wait) { |
327 | scfcp = kmalloc(size: sizeof(*scfcp), GFP_ATOMIC); |
328 | if (!scfcp) { |
329 | WARN_ON_ONCE(!IS_ENABLED(CONFIG_KASAN)); |
330 | atomic_inc(v: &n_alloc_errs); |
331 | allocfail = true; |
332 | } else { |
333 | scfcp->scfc_cpu = -1; |
334 | scfcp->scfc_wait = scfsp->scfs_wait; |
335 | scfcp->scfc_out = false; |
336 | scfcp->scfc_rpc = false; |
337 | } |
338 | } |
339 | switch (scfsp->scfs_prim) { |
340 | case SCF_PRIM_RESCHED: |
341 | if (IS_BUILTIN(CONFIG_SCF_TORTURE_TEST)) { |
342 | cpu = torture_random(trsp) % nr_cpu_ids; |
343 | scfp->n_resched++; |
344 | resched_cpu(cpu); |
345 | this_cpu_inc(scf_invoked_count); |
346 | } |
347 | break; |
348 | case SCF_PRIM_SINGLE: |
349 | cpu = torture_random(trsp) % nr_cpu_ids; |
350 | if (scfsp->scfs_wait) |
351 | scfp->n_single_wait++; |
352 | else |
353 | scfp->n_single++; |
354 | if (scfcp) { |
355 | scfcp->scfc_cpu = cpu; |
356 | barrier(); // Prevent race-reduction compiler optimizations. |
357 | scfcp->scfc_in = true; |
358 | } |
359 | ret = smp_call_function_single(cpuid: cpu, func: scf_handler_1, info: (void *)scfcp, wait: scfsp->scfs_wait); |
360 | if (ret) { |
361 | if (scfsp->scfs_wait) |
362 | scfp->n_single_wait_ofl++; |
363 | else |
364 | scfp->n_single_ofl++; |
365 | kfree(objp: scfcp); |
366 | scfcp = NULL; |
367 | } |
368 | break; |
369 | case SCF_PRIM_SINGLE_RPC: |
370 | if (!scfcp) |
371 | break; |
372 | cpu = torture_random(trsp) % nr_cpu_ids; |
373 | scfp->n_single_rpc++; |
374 | scfcp->scfc_cpu = cpu; |
375 | scfcp->scfc_wait = true; |
376 | init_completion(x: &scfcp->scfc_completion); |
377 | scfcp->scfc_rpc = true; |
378 | barrier(); // Prevent race-reduction compiler optimizations. |
379 | scfcp->scfc_in = true; |
380 | ret = smp_call_function_single(cpuid: cpu, func: scf_handler_1, info: (void *)scfcp, wait: 0); |
381 | if (!ret) { |
382 | if (use_cpus_read_lock) |
383 | cpus_read_unlock(); |
384 | else |
385 | preempt_enable(); |
386 | wait_for_completion(&scfcp->scfc_completion); |
387 | if (use_cpus_read_lock) |
388 | cpus_read_lock(); |
389 | else |
390 | preempt_disable(); |
391 | } else { |
392 | scfp->n_single_rpc_ofl++; |
393 | kfree(objp: scfcp); |
394 | scfcp = NULL; |
395 | } |
396 | break; |
397 | case SCF_PRIM_MANY: |
398 | if (scfsp->scfs_wait) |
399 | scfp->n_many_wait++; |
400 | else |
401 | scfp->n_many++; |
402 | if (scfcp) { |
403 | barrier(); // Prevent race-reduction compiler optimizations. |
404 | scfcp->scfc_in = true; |
405 | } |
406 | smp_call_function_many(cpu_online_mask, func: scf_handler, info: scfcp, wait: scfsp->scfs_wait); |
407 | break; |
408 | case SCF_PRIM_ALL: |
409 | if (scfsp->scfs_wait) |
410 | scfp->n_all_wait++; |
411 | else |
412 | scfp->n_all++; |
413 | if (scfcp) { |
414 | barrier(); // Prevent race-reduction compiler optimizations. |
415 | scfcp->scfc_in = true; |
416 | } |
417 | smp_call_function(func: scf_handler, info: scfcp, wait: scfsp->scfs_wait); |
418 | break; |
419 | default: |
420 | WARN_ON_ONCE(1); |
421 | if (scfcp) |
422 | scfcp->scfc_out = true; |
423 | } |
424 | if (scfcp && scfsp->scfs_wait) { |
425 | if (WARN_ON_ONCE((num_online_cpus() > 1 || scfsp->scfs_prim == SCF_PRIM_SINGLE) && |
426 | !scfcp->scfc_out)) { |
427 | pr_warn("%s: Memory-ordering failure, scfs_prim: %d.\n" , __func__, scfsp->scfs_prim); |
428 | atomic_inc(v: &n_mb_out_errs); // Leak rather than trash! |
429 | } else { |
430 | kfree(objp: scfcp); |
431 | } |
432 | barrier(); // Prevent race-reduction compiler optimizations. |
433 | } |
434 | if (use_cpus_read_lock) |
435 | cpus_read_unlock(); |
436 | else |
437 | preempt_enable(); |
438 | if (allocfail) |
439 | schedule_timeout_idle(timeout: (1 + longwait) * HZ); // Let no-wait handlers complete. |
440 | else if (!(torture_random(trsp) & 0xfff)) |
441 | schedule_timeout_uninterruptible(timeout: 1); |
442 | } |
443 | |
444 | // SCF test kthread. Repeatedly does calls to members of the |
445 | // smp_call_function() family of functions. |
446 | static int scftorture_invoker(void *arg) |
447 | { |
448 | int cpu; |
449 | int curcpu; |
450 | DEFINE_TORTURE_RANDOM(rand); |
451 | struct scf_statistics *scfp = (struct scf_statistics *)arg; |
452 | bool was_offline = false; |
453 | |
454 | VERBOSE_SCFTORTOUT("scftorture_invoker %d: task started" , scfp->cpu); |
455 | cpu = scfp->cpu % nr_cpu_ids; |
456 | WARN_ON_ONCE(set_cpus_allowed_ptr(current, cpumask_of(cpu))); |
457 | set_user_nice(current, MAX_NICE); |
458 | if (holdoff) |
459 | schedule_timeout_interruptible(timeout: holdoff * HZ); |
460 | |
461 | VERBOSE_SCFTORTOUT("scftorture_invoker %d: Waiting for all SCF torturers from cpu %d" , scfp->cpu, raw_smp_processor_id()); |
462 | |
463 | // Make sure that the CPU is affinitized appropriately during testing. |
464 | curcpu = raw_smp_processor_id(); |
465 | WARN_ONCE(curcpu != scfp->cpu % nr_cpu_ids, |
466 | "%s: Wanted CPU %d, running on %d, nr_cpu_ids = %d\n" , |
467 | __func__, scfp->cpu, curcpu, nr_cpu_ids); |
468 | |
469 | if (!atomic_dec_return(v: &n_started)) |
470 | while (atomic_read_acquire(v: &n_started)) { |
471 | if (torture_must_stop()) { |
472 | VERBOSE_SCFTORTOUT("scftorture_invoker %d ended before starting" , scfp->cpu); |
473 | goto end; |
474 | } |
475 | schedule_timeout_uninterruptible(timeout: 1); |
476 | } |
477 | |
478 | VERBOSE_SCFTORTOUT("scftorture_invoker %d started" , scfp->cpu); |
479 | |
480 | do { |
481 | scftorture_invoke_one(scfp, trsp: &rand); |
482 | while (cpu_is_offline(cpu) && !torture_must_stop()) { |
483 | schedule_timeout_interruptible(HZ / 5); |
484 | was_offline = true; |
485 | } |
486 | if (was_offline) { |
487 | set_cpus_allowed_ptr(current, cpumask_of(cpu)); |
488 | was_offline = false; |
489 | } |
490 | cond_resched(); |
491 | stutter_wait(title: "scftorture_invoker" ); |
492 | } while (!torture_must_stop()); |
493 | |
494 | VERBOSE_SCFTORTOUT("scftorture_invoker %d ended" , scfp->cpu); |
495 | end: |
496 | torture_kthread_stopping(title: "scftorture_invoker" ); |
497 | return 0; |
498 | } |
499 | |
500 | static void |
501 | scftorture_print_module_parms(const char *tag) |
502 | { |
503 | pr_alert(SCFTORT_FLAG |
504 | "--- %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, |
505 | 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); |
506 | } |
507 | |
508 | static void scf_cleanup_handler(void *unused) |
509 | { |
510 | } |
511 | |
512 | static void scf_torture_cleanup(void) |
513 | { |
514 | int i; |
515 | |
516 | if (torture_cleanup_begin()) |
517 | return; |
518 | |
519 | WRITE_ONCE(scfdone, true); |
520 | if (nthreads && scf_stats_p) |
521 | for (i = 0; i < nthreads; i++) |
522 | torture_stop_kthread("scftorture_invoker" , scf_stats_p[i].task); |
523 | else |
524 | goto end; |
525 | smp_call_function(func: scf_cleanup_handler, NULL, wait: 0); |
526 | torture_stop_kthread(scf_torture_stats, scf_torture_stats_task); |
527 | scf_torture_stats_print(); // -After- the stats thread is stopped! |
528 | kfree(objp: scf_stats_p); // -After- the last stats print has completed! |
529 | scf_stats_p = NULL; |
530 | |
531 | if (atomic_read(v: &n_errs) || atomic_read(v: &n_mb_in_errs) || atomic_read(v: &n_mb_out_errs)) |
532 | scftorture_print_module_parms(tag: "End of test: FAILURE" ); |
533 | else if (torture_onoff_failures()) |
534 | scftorture_print_module_parms(tag: "End of test: LOCK_HOTPLUG" ); |
535 | else |
536 | scftorture_print_module_parms(tag: "End of test: SUCCESS" ); |
537 | |
538 | end: |
539 | torture_cleanup_end(); |
540 | } |
541 | |
542 | static int __init scf_torture_init(void) |
543 | { |
544 | long i; |
545 | int firsterr = 0; |
546 | unsigned long weight_resched1 = weight_resched; |
547 | unsigned long weight_single1 = weight_single; |
548 | unsigned long weight_single_rpc1 = weight_single_rpc; |
549 | unsigned long weight_single_wait1 = weight_single_wait; |
550 | unsigned long weight_many1 = weight_many; |
551 | unsigned long weight_many_wait1 = weight_many_wait; |
552 | unsigned long weight_all1 = weight_all; |
553 | unsigned long weight_all_wait1 = weight_all_wait; |
554 | |
555 | if (!torture_init_begin(SCFTORT_STRING, v: verbose)) |
556 | return -EBUSY; |
557 | |
558 | scftorture_print_module_parms(tag: "Start of test" ); |
559 | |
560 | if (weight_resched <= 0 && |
561 | weight_single <= 0 && weight_single_rpc <= 0 && weight_single_wait <= 0 && |
562 | weight_many <= 0 && weight_many_wait <= 0 && |
563 | weight_all <= 0 && weight_all_wait <= 0) { |
564 | weight_resched1 = weight_resched == 0 ? 0 : 2 * nr_cpu_ids; |
565 | weight_single1 = weight_single == 0 ? 0 : 2 * nr_cpu_ids; |
566 | weight_single_rpc1 = weight_single_rpc == 0 ? 0 : 2 * nr_cpu_ids; |
567 | weight_single_wait1 = weight_single_wait == 0 ? 0 : 2 * nr_cpu_ids; |
568 | weight_many1 = weight_many == 0 ? 0 : 2; |
569 | weight_many_wait1 = weight_many_wait == 0 ? 0 : 2; |
570 | weight_all1 = weight_all == 0 ? 0 : 1; |
571 | weight_all_wait1 = weight_all_wait == 0 ? 0 : 1; |
572 | } else { |
573 | if (weight_resched == -1) |
574 | weight_resched1 = 0; |
575 | if (weight_single == -1) |
576 | weight_single1 = 0; |
577 | if (weight_single_rpc == -1) |
578 | weight_single_rpc1 = 0; |
579 | if (weight_single_wait == -1) |
580 | weight_single_wait1 = 0; |
581 | if (weight_many == -1) |
582 | weight_many1 = 0; |
583 | if (weight_many_wait == -1) |
584 | weight_many_wait1 = 0; |
585 | if (weight_all == -1) |
586 | weight_all1 = 0; |
587 | if (weight_all_wait == -1) |
588 | weight_all_wait1 = 0; |
589 | } |
590 | if (weight_resched1 == 0 && weight_single1 == 0 && weight_single_rpc1 == 0 && |
591 | weight_single_wait1 == 0 && weight_many1 == 0 && weight_many_wait1 == 0 && |
592 | weight_all1 == 0 && weight_all_wait1 == 0) { |
593 | SCFTORTOUT_ERRSTRING("all zero weights makes no sense" ); |
594 | firsterr = -EINVAL; |
595 | goto unwind; |
596 | } |
597 | if (IS_BUILTIN(CONFIG_SCF_TORTURE_TEST)) |
598 | scf_sel_add(weight: weight_resched1, SCF_PRIM_RESCHED, wait: false); |
599 | else if (weight_resched1) |
600 | SCFTORTOUT_ERRSTRING("built as module, weight_resched ignored" ); |
601 | scf_sel_add(weight: weight_single1, SCF_PRIM_SINGLE, wait: false); |
602 | scf_sel_add(weight: weight_single_rpc1, SCF_PRIM_SINGLE_RPC, wait: true); |
603 | scf_sel_add(weight: weight_single_wait1, SCF_PRIM_SINGLE, wait: true); |
604 | scf_sel_add(weight: weight_many1, SCF_PRIM_MANY, wait: false); |
605 | scf_sel_add(weight: weight_many_wait1, SCF_PRIM_MANY, wait: true); |
606 | scf_sel_add(weight: weight_all1, SCF_PRIM_ALL, wait: false); |
607 | scf_sel_add(weight: weight_all_wait1, SCF_PRIM_ALL, wait: true); |
608 | scf_sel_dump(); |
609 | |
610 | if (onoff_interval > 0) { |
611 | firsterr = torture_onoff_init(ooholdoff: onoff_holdoff * HZ, oointerval: onoff_interval, NULL); |
612 | if (torture_init_error(firsterr)) |
613 | goto unwind; |
614 | } |
615 | if (shutdown_secs > 0) { |
616 | firsterr = torture_shutdown_init(ssecs: shutdown_secs, cleanup: scf_torture_cleanup); |
617 | if (torture_init_error(firsterr)) |
618 | goto unwind; |
619 | } |
620 | if (stutter > 0) { |
621 | firsterr = torture_stutter_init(s: stutter, sgap: stutter); |
622 | if (torture_init_error(firsterr)) |
623 | goto unwind; |
624 | } |
625 | |
626 | // Worker tasks invoking smp_call_function(). |
627 | if (nthreads < 0) |
628 | nthreads = num_online_cpus(); |
629 | scf_stats_p = kcalloc(n: nthreads, size: sizeof(scf_stats_p[0]), GFP_KERNEL); |
630 | if (!scf_stats_p) { |
631 | SCFTORTOUT_ERRSTRING("out of memory" ); |
632 | firsterr = -ENOMEM; |
633 | goto unwind; |
634 | } |
635 | |
636 | VERBOSE_SCFTORTOUT("Starting %d smp_call_function() threads" , nthreads); |
637 | |
638 | atomic_set(v: &n_started, i: nthreads); |
639 | for (i = 0; i < nthreads; i++) { |
640 | scf_stats_p[i].cpu = i; |
641 | firsterr = torture_create_kthread(scftorture_invoker, (void *)&scf_stats_p[i], |
642 | scf_stats_p[i].task); |
643 | if (torture_init_error(firsterr)) |
644 | goto unwind; |
645 | } |
646 | if (stat_interval > 0) { |
647 | firsterr = torture_create_kthread(scf_torture_stats, NULL, scf_torture_stats_task); |
648 | if (torture_init_error(firsterr)) |
649 | goto unwind; |
650 | } |
651 | |
652 | torture_init_end(); |
653 | return 0; |
654 | |
655 | unwind: |
656 | torture_init_end(); |
657 | scf_torture_cleanup(); |
658 | if (shutdown_secs) { |
659 | WARN_ON(!IS_MODULE(CONFIG_SCF_TORTURE_TEST)); |
660 | kernel_power_off(); |
661 | } |
662 | return firsterr; |
663 | } |
664 | |
665 | module_init(scf_torture_init); |
666 | module_exit(scf_torture_cleanup); |
667 | |