Commit | Line | Data |
---|---|---|
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 | 66 | torture_param(int, weight_single, -1, "Testing weight for single-CPU no-wait operations."); |
9b9a8067 | 67 | torture_param(int, weight_single_rpc, -1, "Testing weight for single-CPU RPC operations."); |
e9d338a0 | 68 | torture_param(int, weight_single_wait, -1, "Testing weight for single-CPU operations."); |
5022b8ac PM |
69 | torture_param(int, weight_many, -1, "Testing weight for multi-CPU no-wait operations."); |
70 | torture_param(int, weight_many_wait, -1, "Testing weight for multi-CPU operations."); | |
e9d338a0 PM |
71 | torture_param(int, weight_all, -1, "Testing weight for all-CPU no-wait operations."); |
72 | torture_param(int, weight_all_wait, -1, "Testing weight for all-CPU operations."); | |
73 | ||
74 | char *torture_type = ""; | |
75 | ||
76 | #ifdef MODULE | |
77 | # define SCFTORT_SHUTDOWN 0 | |
78 | #else | |
79 | # define SCFTORT_SHUTDOWN 1 | |
80 | #endif | |
81 | ||
82 | torture_param(bool, shutdown, SCFTORT_SHUTDOWN, "Shutdown at end of torture test."); | |
83 | ||
84 | struct scf_statistics { | |
85 | struct task_struct *task; | |
86 | int cpu; | |
1ac78b49 | 87 | long long n_resched; |
e9d338a0 | 88 | long long n_single; |
5022b8ac | 89 | long long n_single_ofl; |
9b9a8067 PM |
90 | long long n_single_rpc; |
91 | long long n_single_rpc_ofl; | |
e9d338a0 | 92 | long long n_single_wait; |
5022b8ac PM |
93 | long long n_single_wait_ofl; |
94 | long long n_many; | |
95 | long long n_many_wait; | |
e9d338a0 PM |
96 | long long n_all; |
97 | long long n_all_wait; | |
98 | }; | |
99 | ||
100 | static struct scf_statistics *scf_stats_p; | |
101 | static struct task_struct *scf_torture_stats_task; | |
102 | static DEFINE_PER_CPU(long long, scf_invoked_count); | |
103 | ||
5022b8ac | 104 | // Data for random primitive selection |
1ac78b49 PM |
105 | #define SCF_PRIM_RESCHED 0 |
106 | #define SCF_PRIM_SINGLE 1 | |
9b9a8067 PM |
107 | #define SCF_PRIM_SINGLE_RPC 2 |
108 | #define SCF_PRIM_MANY 3 | |
109 | #define SCF_PRIM_ALL 4 | |
110 | #define SCF_NPRIMS 8 // Need wait and no-wait versions of each, | |
111 | // except for SCF_PRIM_RESCHED and | |
112 | // SCF_PRIM_SINGLE_RPC. | |
5022b8ac PM |
113 | |
114 | static char *scf_prim_name[] = { | |
1ac78b49 | 115 | "resched_cpu", |
5022b8ac | 116 | "smp_call_function_single", |
9b9a8067 | 117 | "smp_call_function_single_rpc", |
5022b8ac PM |
118 | "smp_call_function_many", |
119 | "smp_call_function", | |
120 | }; | |
121 | ||
122 | struct scf_selector { | |
123 | unsigned long scfs_weight; | |
124 | int scfs_prim; | |
125 | bool scfs_wait; | |
126 | }; | |
127 | static struct scf_selector scf_sel_array[SCF_NPRIMS]; | |
128 | static int scf_sel_array_len; | |
129 | static unsigned long scf_sel_totweight; | |
130 | ||
b93e21a5 PM |
131 | // Communicate between caller and handler. |
132 | struct scf_check { | |
133 | bool scfc_in; | |
134 | bool scfc_out; | |
135 | int scfc_cpu; // -1 for not _single(). | |
136 | bool scfc_wait; | |
9b9a8067 PM |
137 | bool scfc_rpc; |
138 | struct completion scfc_completion; | |
b93e21a5 PM |
139 | }; |
140 | ||
e9d338a0 PM |
141 | // Use to wait for all threads to start. |
142 | static atomic_t n_started; | |
143 | static atomic_t n_errs; | |
b93e21a5 PM |
144 | static atomic_t n_mb_in_errs; |
145 | static atomic_t n_mb_out_errs; | |
146 | static atomic_t n_alloc_errs; | |
e9d338a0 | 147 | static bool scfdone; |
dbf83b65 | 148 | static char *bangstr = ""; |
e9d338a0 | 149 | |
9a52a574 | 150 | static DEFINE_TORTURE_RANDOM_PERCPU(scf_torture_rand); |
e9d338a0 | 151 | |
1ac78b49 PM |
152 | extern void resched_cpu(int cpu); // An alternative IPI vector. |
153 | ||
e9d338a0 PM |
154 | // Print torture statistics. Caller must ensure serialization. |
155 | static void scf_torture_stats_print(void) | |
156 | { | |
157 | int cpu; | |
dba3142b | 158 | int i; |
e9d338a0 PM |
159 | long long invoked_count = 0; |
160 | bool isdone = READ_ONCE(scfdone); | |
dba3142b | 161 | struct scf_statistics scfs = {}; |
e9d338a0 PM |
162 | |
163 | for_each_possible_cpu(cpu) | |
164 | invoked_count += data_race(per_cpu(scf_invoked_count, cpu)); | |
dba3142b | 165 | for (i = 0; i < nthreads; i++) { |
1ac78b49 | 166 | scfs.n_resched += scf_stats_p[i].n_resched; |
dba3142b PM |
167 | scfs.n_single += scf_stats_p[i].n_single; |
168 | scfs.n_single_ofl += scf_stats_p[i].n_single_ofl; | |
9b9a8067 | 169 | scfs.n_single_rpc += scf_stats_p[i].n_single_rpc; |
dba3142b PM |
170 | scfs.n_single_wait += scf_stats_p[i].n_single_wait; |
171 | scfs.n_single_wait_ofl += scf_stats_p[i].n_single_wait_ofl; | |
172 | scfs.n_many += scf_stats_p[i].n_many; | |
173 | scfs.n_many_wait += scf_stats_p[i].n_many_wait; | |
174 | scfs.n_all += scf_stats_p[i].n_all; | |
175 | scfs.n_all_wait += scf_stats_p[i].n_all_wait; | |
176 | } | |
dbf83b65 PM |
177 | if (atomic_read(&n_errs) || atomic_read(&n_mb_in_errs) || |
178 | atomic_read(&n_mb_out_errs) || atomic_read(&n_alloc_errs)) | |
179 | bangstr = "!!! "; | |
9b9a8067 | 180 | 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 ", |
1ac78b49 | 181 | SCFTORT_FLAG, bangstr, isdone ? "VER" : "ver", invoked_count, scfs.n_resched, |
dba3142b | 182 | scfs.n_single, scfs.n_single_wait, scfs.n_single_ofl, scfs.n_single_wait_ofl, |
9b9a8067 | 183 | scfs.n_single_rpc, scfs.n_single_rpc_ofl, |
dba3142b | 184 | scfs.n_many, scfs.n_many_wait, scfs.n_all, scfs.n_all_wait); |
e9d338a0 | 185 | torture_onoff_stats(); |
dbf83b65 PM |
186 | pr_cont("ste: %d stnmie: %d stnmoe: %d staf: %d\n", atomic_read(&n_errs), |
187 | atomic_read(&n_mb_in_errs), atomic_read(&n_mb_out_errs), | |
188 | atomic_read(&n_alloc_errs)); | |
e9d338a0 PM |
189 | } |
190 | ||
191 | // Periodically prints torture statistics, if periodic statistics printing | |
192 | // was specified via the stat_interval module parameter. | |
193 | static int | |
194 | scf_torture_stats(void *arg) | |
195 | { | |
196 | VERBOSE_TOROUT_STRING("scf_torture_stats task started"); | |
197 | do { | |
198 | schedule_timeout_interruptible(stat_interval * HZ); | |
199 | scf_torture_stats_print(); | |
200 | torture_shutdown_absorb("scf_torture_stats"); | |
201 | } while (!torture_must_stop()); | |
202 | torture_kthread_stopping("scf_torture_stats"); | |
203 | return 0; | |
204 | } | |
205 | ||
5022b8ac PM |
206 | // Add a primitive to the scf_sel_array[]. |
207 | static void scf_sel_add(unsigned long weight, int prim, bool wait) | |
208 | { | |
209 | struct scf_selector *scfsp = &scf_sel_array[scf_sel_array_len]; | |
210 | ||
211 | // If no weight, if array would overflow, if computing three-place | |
212 | // percentages would overflow, or if the scf_prim_name[] array would | |
213 | // overflow, don't bother. In the last three two cases, complain. | |
214 | if (!weight || | |
215 | WARN_ON_ONCE(scf_sel_array_len >= ARRAY_SIZE(scf_sel_array)) || | |
216 | WARN_ON_ONCE(0 - 100000 * weight <= 100000 * scf_sel_totweight) || | |
217 | WARN_ON_ONCE(prim >= ARRAY_SIZE(scf_prim_name))) | |
218 | return; | |
219 | scf_sel_totweight += weight; | |
220 | scfsp->scfs_weight = scf_sel_totweight; | |
221 | scfsp->scfs_prim = prim; | |
222 | scfsp->scfs_wait = wait; | |
223 | scf_sel_array_len++; | |
224 | } | |
225 | ||
226 | // Dump out weighting percentages for scf_prim_name[] array. | |
227 | static void scf_sel_dump(void) | |
228 | { | |
229 | int i; | |
230 | unsigned long oldw = 0; | |
231 | struct scf_selector *scfsp; | |
232 | unsigned long w; | |
233 | ||
234 | for (i = 0; i < scf_sel_array_len; i++) { | |
235 | scfsp = &scf_sel_array[i]; | |
236 | w = (scfsp->scfs_weight - oldw) * 100000 / scf_sel_totweight; | |
237 | pr_info("%s: %3lu.%03lu %s(%s)\n", __func__, w / 1000, w % 1000, | |
238 | scf_prim_name[scfsp->scfs_prim], | |
239 | scfsp->scfs_wait ? "wait" : "nowait"); | |
240 | oldw = scfsp->scfs_weight; | |
241 | } | |
242 | } | |
243 | ||
244 | // Randomly pick a primitive and wait/nowait, based on weightings. | |
245 | static struct scf_selector *scf_sel_rand(struct torture_random_state *trsp) | |
246 | { | |
247 | int i; | |
248 | unsigned long w = torture_random(trsp) % (scf_sel_totweight + 1); | |
249 | ||
250 | for (i = 0; i < scf_sel_array_len; i++) | |
251 | if (scf_sel_array[i].scfs_weight >= w) | |
252 | return &scf_sel_array[i]; | |
253 | WARN_ON_ONCE(1); | |
254 | return &scf_sel_array[0]; | |
255 | } | |
256 | ||
e9d338a0 PM |
257 | // Update statistics and occasionally burn up mass quantities of CPU time, |
258 | // if told to do so via scftorture.longwait. Otherwise, occasionally burn | |
259 | // a little bit. | |
b93e21a5 | 260 | static void scf_handler(void *scfc_in) |
e9d338a0 PM |
261 | { |
262 | int i; | |
263 | int j; | |
264 | unsigned long r = torture_random(this_cpu_ptr(&scf_torture_rand)); | |
b93e21a5 | 265 | struct scf_check *scfcp = scfc_in; |
e9d338a0 | 266 | |
980205ee PM |
267 | if (likely(scfcp)) { |
268 | WRITE_ONCE(scfcp->scfc_out, false); // For multiple receivers. | |
269 | if (WARN_ON_ONCE(unlikely(!READ_ONCE(scfcp->scfc_in)))) | |
270 | atomic_inc(&n_mb_in_errs); | |
271 | } | |
e9d338a0 PM |
272 | this_cpu_inc(scf_invoked_count); |
273 | if (longwait <= 0) { | |
274 | if (!(r & 0xffc0)) | |
275 | udelay(r & 0x3f); | |
b93e21a5 | 276 | goto out; |
e9d338a0 PM |
277 | } |
278 | if (r & 0xfff) | |
b93e21a5 | 279 | goto out; |
e9d338a0 PM |
280 | r = (r >> 12); |
281 | if (longwait <= 0) { | |
282 | udelay((r & 0xff) + 1); | |
b93e21a5 | 283 | goto out; |
e9d338a0 PM |
284 | } |
285 | r = r % longwait + 1; | |
286 | for (i = 0; i < r; i++) { | |
287 | for (j = 0; j < 1000; j++) { | |
288 | udelay(1000); | |
289 | cpu_relax(); | |
290 | } | |
291 | } | |
b93e21a5 PM |
292 | out: |
293 | if (unlikely(!scfcp)) | |
294 | return; | |
9b9a8067 | 295 | if (scfcp->scfc_wait) { |
b93e21a5 | 296 | WRITE_ONCE(scfcp->scfc_out, true); |
9b9a8067 PM |
297 | if (scfcp->scfc_rpc) |
298 | complete(&scfcp->scfc_completion); | |
299 | } else { | |
b93e21a5 | 300 | kfree(scfcp); |
9b9a8067 | 301 | } |
e9d338a0 PM |
302 | } |
303 | ||
5022b8ac | 304 | // As above, but check for correct CPU. |
b93e21a5 | 305 | static void scf_handler_1(void *scfc_in) |
5022b8ac | 306 | { |
b93e21a5 PM |
307 | struct scf_check *scfcp = scfc_in; |
308 | ||
309 | 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 | 310 | atomic_inc(&n_errs); |
b93e21a5 PM |
311 | } |
312 | scf_handler(scfcp); | |
5022b8ac PM |
313 | } |
314 | ||
e9d338a0 | 315 | // Randomly do an smp_call_function*() invocation. |
5022b8ac | 316 | static void scftorture_invoke_one(struct scf_statistics *scfp, struct torture_random_state *trsp) |
e9d338a0 | 317 | { |
5022b8ac | 318 | uintptr_t cpu; |
676e5469 | 319 | int ret = 0; |
b93e21a5 | 320 | struct scf_check *scfcp = NULL; |
5022b8ac PM |
321 | struct scf_selector *scfsp = scf_sel_rand(trsp); |
322 | ||
e9d338a0 PM |
323 | if (use_cpus_read_lock) |
324 | cpus_read_lock(); | |
325 | else | |
326 | preempt_disable(); | |
34e8c483 | 327 | if (scfsp->scfs_prim == SCF_PRIM_SINGLE || scfsp->scfs_wait) { |
b93e21a5 | 328 | scfcp = kmalloc(sizeof(*scfcp), GFP_ATOMIC); |
4df55bdd | 329 | if (WARN_ON_ONCE(!scfcp)) { |
b93e21a5 | 330 | atomic_inc(&n_alloc_errs); |
4df55bdd PM |
331 | } else { |
332 | scfcp->scfc_cpu = -1; | |
333 | scfcp->scfc_wait = scfsp->scfs_wait; | |
334 | scfcp->scfc_out = false; | |
9b9a8067 | 335 | scfcp->scfc_rpc = false; |
4df55bdd | 336 | } |
34e8c483 PM |
337 | } |
338 | switch (scfsp->scfs_prim) { | |
1ac78b49 PM |
339 | case SCF_PRIM_RESCHED: |
340 | if (IS_BUILTIN(CONFIG_SCF_TORTURE_TEST)) { | |
341 | cpu = torture_random(trsp) % nr_cpu_ids; | |
342 | scfp->n_resched++; | |
343 | resched_cpu(cpu); | |
c3d0258d | 344 | this_cpu_inc(scf_invoked_count); |
1ac78b49 PM |
345 | } |
346 | break; | |
34e8c483 | 347 | case SCF_PRIM_SINGLE: |
5022b8ac PM |
348 | cpu = torture_random(trsp) % nr_cpu_ids; |
349 | if (scfsp->scfs_wait) | |
350 | scfp->n_single_wait++; | |
351 | else | |
352 | scfp->n_single++; | |
b93e21a5 PM |
353 | if (scfcp) { |
354 | scfcp->scfc_cpu = cpu; | |
ee7035d2 | 355 | barrier(); // Prevent race-reduction compiler optimizations. |
b93e21a5 PM |
356 | scfcp->scfc_in = true; |
357 | } | |
358 | ret = smp_call_function_single(cpu, scf_handler_1, (void *)scfcp, scfsp->scfs_wait); | |
5022b8ac PM |
359 | if (ret) { |
360 | if (scfsp->scfs_wait) | |
361 | scfp->n_single_wait_ofl++; | |
362 | else | |
363 | scfp->n_single_ofl++; | |
b93e21a5 | 364 | kfree(scfcp); |
676e5469 | 365 | scfcp = NULL; |
5022b8ac PM |
366 | } |
367 | break; | |
9b9a8067 PM |
368 | case SCF_PRIM_SINGLE_RPC: |
369 | if (!scfcp) | |
370 | break; | |
371 | cpu = torture_random(trsp) % nr_cpu_ids; | |
372 | scfp->n_single_rpc++; | |
373 | scfcp->scfc_cpu = cpu; | |
374 | scfcp->scfc_wait = true; | |
375 | init_completion(&scfcp->scfc_completion); | |
376 | scfcp->scfc_rpc = true; | |
377 | barrier(); // Prevent race-reduction compiler optimizations. | |
378 | scfcp->scfc_in = true; | |
379 | ret = smp_call_function_single(cpu, scf_handler_1, (void *)scfcp, 0); | |
380 | if (!ret) { | |
381 | if (use_cpus_read_lock) | |
382 | cpus_read_unlock(); | |
383 | else | |
384 | preempt_enable(); | |
385 | wait_for_completion(&scfcp->scfc_completion); | |
386 | if (use_cpus_read_lock) | |
387 | cpus_read_lock(); | |
388 | else | |
389 | preempt_disable(); | |
390 | } else { | |
391 | scfp->n_single_rpc_ofl++; | |
392 | kfree(scfcp); | |
393 | scfcp = NULL; | |
394 | } | |
395 | break; | |
5022b8ac PM |
396 | case SCF_PRIM_MANY: |
397 | if (scfsp->scfs_wait) | |
398 | scfp->n_many_wait++; | |
399 | else | |
400 | scfp->n_many++; | |
ee7035d2 PM |
401 | if (scfcp) { |
402 | barrier(); // Prevent race-reduction compiler optimizations. | |
980205ee | 403 | scfcp->scfc_in = true; |
ee7035d2 | 404 | } |
980205ee | 405 | smp_call_function_many(cpu_online_mask, scf_handler, scfcp, scfsp->scfs_wait); |
5022b8ac PM |
406 | break; |
407 | case SCF_PRIM_ALL: | |
408 | if (scfsp->scfs_wait) | |
409 | scfp->n_all_wait++; | |
410 | else | |
411 | scfp->n_all++; | |
ee7035d2 PM |
412 | if (scfcp) { |
413 | barrier(); // Prevent race-reduction compiler optimizations. | |
34e8c483 | 414 | scfcp->scfc_in = true; |
ee7035d2 | 415 | } |
34e8c483 | 416 | smp_call_function(scf_handler, scfcp, scfsp->scfs_wait); |
5022b8ac | 417 | break; |
de77d4da PM |
418 | default: |
419 | WARN_ON_ONCE(1); | |
420 | if (scfcp) | |
421 | scfcp->scfc_out = true; | |
5022b8ac | 422 | } |
676e5469 | 423 | if (scfcp && scfsp->scfs_wait) { |
9e66bf03 | 424 | if (WARN_ON_ONCE((num_online_cpus() > 1 || scfsp->scfs_prim == SCF_PRIM_SINGLE) && |
9b9a8067 PM |
425 | !scfcp->scfc_out)) { |
426 | pr_warn("%s: Memory-ordering failure, scfs_prim: %d.\n", __func__, scfsp->scfs_prim); | |
676e5469 | 427 | atomic_inc(&n_mb_out_errs); // Leak rather than trash! |
9b9a8067 | 428 | } else { |
676e5469 | 429 | kfree(scfcp); |
9b9a8067 | 430 | } |
ee7035d2 | 431 | barrier(); // Prevent race-reduction compiler optimizations. |
676e5469 | 432 | } |
e9d338a0 PM |
433 | if (use_cpus_read_lock) |
434 | cpus_read_unlock(); | |
435 | else | |
436 | preempt_enable(); | |
437 | if (!(torture_random(trsp) & 0xfff)) | |
438 | schedule_timeout_uninterruptible(1); | |
439 | } | |
440 | ||
441 | // SCF test kthread. Repeatedly does calls to members of the | |
442 | // smp_call_function() family of functions. | |
443 | static int scftorture_invoker(void *arg) | |
444 | { | |
a7c072ef | 445 | int cpu; |
f3ea978b | 446 | int curcpu; |
e9d338a0 PM |
447 | DEFINE_TORTURE_RANDOM(rand); |
448 | struct scf_statistics *scfp = (struct scf_statistics *)arg; | |
a7c072ef | 449 | bool was_offline = false; |
e9d338a0 PM |
450 | |
451 | VERBOSE_SCFTORTOUT("scftorture_invoker %d: task started", scfp->cpu); | |
a7c072ef | 452 | cpu = scfp->cpu % nr_cpu_ids; |
22b6d149 | 453 | WARN_ON_ONCE(set_cpus_allowed_ptr(current, cpumask_of(cpu))); |
e9d338a0 PM |
454 | set_user_nice(current, MAX_NICE); |
455 | if (holdoff) | |
456 | schedule_timeout_interruptible(holdoff * HZ); | |
457 | ||
22b6d149 | 458 | VERBOSE_SCFTORTOUT("scftorture_invoker %d: Waiting for all SCF torturers from cpu %d", scfp->cpu, raw_smp_processor_id()); |
e9d338a0 PM |
459 | |
460 | // Make sure that the CPU is affinitized appropriately during testing. | |
22b6d149 | 461 | curcpu = raw_smp_processor_id(); |
f3ea978b PM |
462 | WARN_ONCE(curcpu != scfp->cpu % nr_cpu_ids, |
463 | "%s: Wanted CPU %d, running on %d, nr_cpu_ids = %d\n", | |
464 | __func__, scfp->cpu, curcpu, nr_cpu_ids); | |
e9d338a0 PM |
465 | |
466 | if (!atomic_dec_return(&n_started)) | |
467 | while (atomic_read_acquire(&n_started)) { | |
468 | if (torture_must_stop()) { | |
469 | VERBOSE_SCFTORTOUT("scftorture_invoker %d ended before starting", scfp->cpu); | |
470 | goto end; | |
471 | } | |
472 | schedule_timeout_uninterruptible(1); | |
473 | } | |
474 | ||
475 | VERBOSE_SCFTORTOUT("scftorture_invoker %d started", scfp->cpu); | |
476 | ||
477 | do { | |
478 | scftorture_invoke_one(scfp, &rand); | |
a7c072ef PM |
479 | while (cpu_is_offline(cpu) && !torture_must_stop()) { |
480 | schedule_timeout_interruptible(HZ / 5); | |
481 | was_offline = true; | |
482 | } | |
483 | if (was_offline) { | |
484 | set_cpus_allowed_ptr(current, cpumask_of(cpu)); | |
485 | was_offline = false; | |
486 | } | |
65bd77f5 | 487 | cond_resched(); |
85558182 | 488 | stutter_wait("scftorture_invoker"); |
e9d338a0 PM |
489 | } while (!torture_must_stop()); |
490 | ||
491 | VERBOSE_SCFTORTOUT("scftorture_invoker %d ended", scfp->cpu); | |
492 | end: | |
493 | torture_kthread_stopping("scftorture_invoker"); | |
494 | return 0; | |
495 | } | |
496 | ||
497 | static void | |
498 | scftorture_print_module_parms(const char *tag) | |
499 | { | |
500 | pr_alert(SCFTORT_FLAG | |
9b9a8067 PM |
501 | "--- %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, |
502 | 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); | |
e9d338a0 PM |
503 | } |
504 | ||
505 | static void scf_cleanup_handler(void *unused) | |
506 | { | |
507 | } | |
508 | ||
509 | static void scf_torture_cleanup(void) | |
510 | { | |
511 | int i; | |
512 | ||
513 | if (torture_cleanup_begin()) | |
514 | return; | |
515 | ||
516 | WRITE_ONCE(scfdone, true); | |
586e4d41 | 517 | if (nthreads && scf_stats_p) |
e9d338a0 PM |
518 | for (i = 0; i < nthreads; i++) |
519 | torture_stop_kthread("scftorture_invoker", scf_stats_p[i].task); | |
520 | else | |
521 | goto end; | |
e9d338a0 PM |
522 | smp_call_function(scf_cleanup_handler, NULL, 0); |
523 | torture_stop_kthread(scf_torture_stats, scf_torture_stats_task); | |
524 | scf_torture_stats_print(); // -After- the stats thread is stopped! | |
dba3142b PM |
525 | kfree(scf_stats_p); // -After- the last stats print has completed! |
526 | scf_stats_p = NULL; | |
e9d338a0 | 527 | |
dbf83b65 | 528 | if (atomic_read(&n_errs) || atomic_read(&n_mb_in_errs) || atomic_read(&n_mb_out_errs)) |
e9d338a0 PM |
529 | scftorture_print_module_parms("End of test: FAILURE"); |
530 | else if (torture_onoff_failures()) | |
531 | scftorture_print_module_parms("End of test: LOCK_HOTPLUG"); | |
532 | else | |
533 | scftorture_print_module_parms("End of test: SUCCESS"); | |
534 | ||
535 | end: | |
536 | torture_cleanup_end(); | |
537 | } | |
538 | ||
539 | static int __init scf_torture_init(void) | |
540 | { | |
541 | long i; | |
542 | int firsterr = 0; | |
1ac78b49 | 543 | unsigned long weight_resched1 = weight_resched; |
5022b8ac | 544 | unsigned long weight_single1 = weight_single; |
9b9a8067 | 545 | unsigned long weight_single_rpc1 = weight_single_rpc; |
5022b8ac PM |
546 | unsigned long weight_single_wait1 = weight_single_wait; |
547 | unsigned long weight_many1 = weight_many; | |
548 | unsigned long weight_many_wait1 = weight_many_wait; | |
549 | unsigned long weight_all1 = weight_all; | |
550 | unsigned long weight_all_wait1 = weight_all_wait; | |
e9d338a0 PM |
551 | |
552 | if (!torture_init_begin(SCFTORT_STRING, verbose)) | |
553 | return -EBUSY; | |
554 | ||
555 | scftorture_print_module_parms("Start of test"); | |
556 | ||
2f611d04 PM |
557 | if (weight_resched <= 0 && |
558 | weight_single <= 0 && weight_single_rpc <= 0 && weight_single_wait <= 0 && | |
559 | weight_many <= 0 && weight_many_wait <= 0 && | |
560 | weight_all <= 0 && weight_all_wait <= 0) { | |
561 | weight_resched1 = weight_resched == 0 ? 0 : 2 * nr_cpu_ids; | |
562 | weight_single1 = weight_single == 0 ? 0 : 2 * nr_cpu_ids; | |
563 | weight_single_rpc1 = weight_single_rpc == 0 ? 0 : 2 * nr_cpu_ids; | |
564 | weight_single_wait1 = weight_single_wait == 0 ? 0 : 2 * nr_cpu_ids; | |
565 | weight_many1 = weight_many == 0 ? 0 : 2; | |
566 | weight_many_wait1 = weight_many_wait == 0 ? 0 : 2; | |
567 | weight_all1 = weight_all == 0 ? 0 : 1; | |
568 | weight_all_wait1 = weight_all_wait == 0 ? 0 : 1; | |
e9d338a0 | 569 | } else { |
1ac78b49 PM |
570 | if (weight_resched == -1) |
571 | weight_resched1 = 0; | |
e9d338a0 | 572 | if (weight_single == -1) |
5022b8ac | 573 | weight_single1 = 0; |
9b9a8067 PM |
574 | if (weight_single_rpc == -1) |
575 | weight_single_rpc1 = 0; | |
e9d338a0 | 576 | if (weight_single_wait == -1) |
5022b8ac PM |
577 | weight_single_wait1 = 0; |
578 | if (weight_many == -1) | |
579 | weight_many1 = 0; | |
580 | if (weight_many_wait == -1) | |
581 | weight_many_wait1 = 0; | |
e9d338a0 | 582 | if (weight_all == -1) |
5022b8ac | 583 | weight_all1 = 0; |
e9d338a0 | 584 | if (weight_all_wait == -1) |
5022b8ac | 585 | weight_all_wait1 = 0; |
e9d338a0 | 586 | } |
da9366c6 PM |
587 | if (weight_resched1 == 0 && weight_single1 == 0 && weight_single_rpc1 == 0 && |
588 | weight_single_wait1 == 0 && weight_many1 == 0 && weight_many_wait1 == 0 && | |
5022b8ac PM |
589 | weight_all1 == 0 && weight_all_wait1 == 0) { |
590 | VERBOSE_SCFTORTOUT_ERRSTRING("all zero weights makes no sense"); | |
e9d338a0 PM |
591 | firsterr = -EINVAL; |
592 | goto unwind; | |
593 | } | |
1ac78b49 PM |
594 | if (IS_BUILTIN(CONFIG_SCF_TORTURE_TEST)) |
595 | scf_sel_add(weight_resched1, SCF_PRIM_RESCHED, false); | |
596 | else if (weight_resched1) | |
597 | VERBOSE_SCFTORTOUT_ERRSTRING("built as module, weight_resched ignored"); | |
5022b8ac | 598 | scf_sel_add(weight_single1, SCF_PRIM_SINGLE, false); |
9b9a8067 | 599 | scf_sel_add(weight_single_rpc1, SCF_PRIM_SINGLE_RPC, true); |
5022b8ac PM |
600 | scf_sel_add(weight_single_wait1, SCF_PRIM_SINGLE, true); |
601 | scf_sel_add(weight_many1, SCF_PRIM_MANY, false); | |
602 | scf_sel_add(weight_many_wait1, SCF_PRIM_MANY, true); | |
603 | scf_sel_add(weight_all1, SCF_PRIM_ALL, false); | |
604 | scf_sel_add(weight_all_wait1, SCF_PRIM_ALL, true); | |
605 | scf_sel_dump(); | |
e9d338a0 PM |
606 | |
607 | if (onoff_interval > 0) { | |
608 | firsterr = torture_onoff_init(onoff_holdoff * HZ, onoff_interval, NULL); | |
f2bdf7dc | 609 | if (torture_init_error(firsterr)) |
e9d338a0 PM |
610 | goto unwind; |
611 | } | |
612 | if (shutdown_secs > 0) { | |
613 | firsterr = torture_shutdown_init(shutdown_secs, scf_torture_cleanup); | |
f2bdf7dc | 614 | if (torture_init_error(firsterr)) |
e9d338a0 PM |
615 | goto unwind; |
616 | } | |
85558182 PM |
617 | if (stutter > 0) { |
618 | firsterr = torture_stutter_init(stutter, stutter); | |
f2bdf7dc | 619 | if (torture_init_error(firsterr)) |
85558182 PM |
620 | goto unwind; |
621 | } | |
e9d338a0 PM |
622 | |
623 | // Worker tasks invoking smp_call_function(). | |
624 | if (nthreads < 0) | |
625 | nthreads = num_online_cpus(); | |
626 | scf_stats_p = kcalloc(nthreads, sizeof(scf_stats_p[0]), GFP_KERNEL); | |
627 | if (!scf_stats_p) { | |
628 | VERBOSE_SCFTORTOUT_ERRSTRING("out of memory"); | |
629 | firsterr = -ENOMEM; | |
630 | goto unwind; | |
631 | } | |
632 | ||
633 | VERBOSE_SCFTORTOUT("Starting %d smp_call_function() threads\n", nthreads); | |
634 | ||
635 | atomic_set(&n_started, nthreads); | |
636 | for (i = 0; i < nthreads; i++) { | |
637 | scf_stats_p[i].cpu = i; | |
638 | firsterr = torture_create_kthread(scftorture_invoker, (void *)&scf_stats_p[i], | |
639 | scf_stats_p[i].task); | |
f2bdf7dc | 640 | if (torture_init_error(firsterr)) |
e9d338a0 PM |
641 | goto unwind; |
642 | } | |
643 | if (stat_interval > 0) { | |
644 | firsterr = torture_create_kthread(scf_torture_stats, NULL, scf_torture_stats_task); | |
f2bdf7dc | 645 | if (torture_init_error(firsterr)) |
e9d338a0 PM |
646 | goto unwind; |
647 | } | |
648 | ||
649 | torture_init_end(); | |
650 | return 0; | |
651 | ||
652 | unwind: | |
653 | torture_init_end(); | |
654 | scf_torture_cleanup(); | |
2b1388f8 PM |
655 | if (shutdown_secs) { |
656 | WARN_ON(!IS_MODULE(CONFIG_SCF_TORTURE_TEST)); | |
657 | kernel_power_off(); | |
658 | } | |
e9d338a0 PM |
659 | return firsterr; |
660 | } | |
661 | ||
662 | module_init(scf_torture_init); | |
663 | module_exit(scf_torture_cleanup); |