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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 | ||
e9d338a0 | 41 | #define VERBOSE_SCFTORTOUT(s, x...) \ |
71f6ea2a | 42 | do { if (verbose) pr_alert(SCFTORT_FLAG s "\n", ## x); } while (0) |
e9d338a0 | 43 | |
809da9bf | 44 | #define SCFTORTOUT_ERRSTRING(s, x...) pr_alert(SCFTORT_FLAG "!!! " s "\n", ## x) |
e9d338a0 PM |
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."); | |
85558182 | 58 | torture_param(int, stutter, 5, "Number of jiffies to run/halt test, 0=disable"); |
e9d338a0 PM |
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"); | |
1ac78b49 | 61 | torture_param(int, weight_resched, -1, "Testing weight for resched_cpu() operations."); |
e9d338a0 | 62 | torture_param(int, weight_single, -1, "Testing weight for single-CPU no-wait operations."); |
9b9a8067 | 63 | torture_param(int, weight_single_rpc, -1, "Testing weight for single-CPU RPC operations."); |
e9d338a0 | 64 | torture_param(int, weight_single_wait, -1, "Testing weight for single-CPU operations."); |
5022b8ac PM |
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."); | |
e9d338a0 PM |
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; | |
1ac78b49 | 83 | long long n_resched; |
e9d338a0 | 84 | long long n_single; |
5022b8ac | 85 | long long n_single_ofl; |
9b9a8067 PM |
86 | long long n_single_rpc; |
87 | long long n_single_rpc_ofl; | |
e9d338a0 | 88 | long long n_single_wait; |
5022b8ac PM |
89 | long long n_single_wait_ofl; |
90 | long long n_many; | |
91 | long long n_many_wait; | |
e9d338a0 PM |
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 | ||
5022b8ac | 100 | // Data for random primitive selection |
1ac78b49 PM |
101 | #define SCF_PRIM_RESCHED 0 |
102 | #define SCF_PRIM_SINGLE 1 | |
9b9a8067 PM |
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. | |
5022b8ac PM |
109 | |
110 | static char *scf_prim_name[] = { | |
1ac78b49 | 111 | "resched_cpu", |
5022b8ac | 112 | "smp_call_function_single", |
9b9a8067 | 113 | "smp_call_function_single_rpc", |
5022b8ac PM |
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 | ||
b93e21a5 PM |
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; | |
9b9a8067 PM |
133 | bool scfc_rpc; |
134 | struct completion scfc_completion; | |
b93e21a5 PM |
135 | }; |
136 | ||
e9d338a0 PM |
137 | // Use to wait for all threads to start. |
138 | static atomic_t n_started; | |
139 | static atomic_t n_errs; | |
b93e21a5 PM |
140 | static atomic_t n_mb_in_errs; |
141 | static atomic_t n_mb_out_errs; | |
142 | static atomic_t n_alloc_errs; | |
e9d338a0 | 143 | static bool scfdone; |
dbf83b65 | 144 | static char *bangstr = ""; |
e9d338a0 | 145 | |
9a52a574 | 146 | static DEFINE_TORTURE_RANDOM_PERCPU(scf_torture_rand); |
e9d338a0 | 147 | |
1ac78b49 PM |
148 | extern void resched_cpu(int cpu); // An alternative IPI vector. |
149 | ||
e9d338a0 PM |
150 | // Print torture statistics. Caller must ensure serialization. |
151 | static void scf_torture_stats_print(void) | |
152 | { | |
153 | int cpu; | |
dba3142b | 154 | int i; |
e9d338a0 PM |
155 | long long invoked_count = 0; |
156 | bool isdone = READ_ONCE(scfdone); | |
dba3142b | 157 | struct scf_statistics scfs = {}; |
e9d338a0 PM |
158 | |
159 | for_each_possible_cpu(cpu) | |
160 | invoked_count += data_race(per_cpu(scf_invoked_count, cpu)); | |
dba3142b | 161 | for (i = 0; i < nthreads; i++) { |
1ac78b49 | 162 | scfs.n_resched += scf_stats_p[i].n_resched; |
dba3142b PM |
163 | scfs.n_single += scf_stats_p[i].n_single; |
164 | scfs.n_single_ofl += scf_stats_p[i].n_single_ofl; | |
9b9a8067 | 165 | scfs.n_single_rpc += scf_stats_p[i].n_single_rpc; |
dba3142b PM |
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 | } | |
dbf83b65 PM |
173 | if (atomic_read(&n_errs) || atomic_read(&n_mb_in_errs) || |
174 | atomic_read(&n_mb_out_errs) || atomic_read(&n_alloc_errs)) | |
175 | bangstr = "!!! "; | |
9b9a8067 | 176 | 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 | 177 | SCFTORT_FLAG, bangstr, isdone ? "VER" : "ver", invoked_count, scfs.n_resched, |
dba3142b | 178 | scfs.n_single, scfs.n_single_wait, scfs.n_single_ofl, scfs.n_single_wait_ofl, |
9b9a8067 | 179 | scfs.n_single_rpc, scfs.n_single_rpc_ofl, |
dba3142b | 180 | scfs.n_many, scfs.n_many_wait, scfs.n_all, scfs.n_all_wait); |
e9d338a0 | 181 | torture_onoff_stats(); |
dbf83b65 PM |
182 | pr_cont("ste: %d stnmie: %d stnmoe: %d staf: %d\n", atomic_read(&n_errs), |
183 | atomic_read(&n_mb_in_errs), atomic_read(&n_mb_out_errs), | |
184 | atomic_read(&n_alloc_errs)); | |
e9d338a0 PM |
185 | } |
186 | ||
187 | // Periodically prints torture statistics, if periodic statistics printing | |
188 | // was specified via the stat_interval module parameter. | |
189 | static int | |
190 | scf_torture_stats(void *arg) | |
191 | { | |
192 | VERBOSE_TOROUT_STRING("scf_torture_stats task started"); | |
193 | do { | |
194 | schedule_timeout_interruptible(stat_interval * HZ); | |
195 | scf_torture_stats_print(); | |
196 | torture_shutdown_absorb("scf_torture_stats"); | |
197 | } while (!torture_must_stop()); | |
198 | torture_kthread_stopping("scf_torture_stats"); | |
199 | return 0; | |
200 | } | |
201 | ||
5022b8ac PM |
202 | // Add a primitive to the scf_sel_array[]. |
203 | static void scf_sel_add(unsigned long weight, int prim, bool wait) | |
204 | { | |
205 | struct scf_selector *scfsp = &scf_sel_array[scf_sel_array_len]; | |
206 | ||
207 | // If no weight, if array would overflow, if computing three-place | |
208 | // percentages would overflow, or if the scf_prim_name[] array would | |
209 | // overflow, don't bother. In the last three two cases, complain. | |
210 | if (!weight || | |
211 | WARN_ON_ONCE(scf_sel_array_len >= ARRAY_SIZE(scf_sel_array)) || | |
212 | WARN_ON_ONCE(0 - 100000 * weight <= 100000 * scf_sel_totweight) || | |
213 | WARN_ON_ONCE(prim >= ARRAY_SIZE(scf_prim_name))) | |
214 | return; | |
215 | scf_sel_totweight += weight; | |
216 | scfsp->scfs_weight = scf_sel_totweight; | |
217 | scfsp->scfs_prim = prim; | |
218 | scfsp->scfs_wait = wait; | |
219 | scf_sel_array_len++; | |
220 | } | |
221 | ||
222 | // Dump out weighting percentages for scf_prim_name[] array. | |
223 | static void scf_sel_dump(void) | |
224 | { | |
225 | int i; | |
226 | unsigned long oldw = 0; | |
227 | struct scf_selector *scfsp; | |
228 | unsigned long w; | |
229 | ||
230 | for (i = 0; i < scf_sel_array_len; i++) { | |
231 | scfsp = &scf_sel_array[i]; | |
232 | w = (scfsp->scfs_weight - oldw) * 100000 / scf_sel_totweight; | |
233 | pr_info("%s: %3lu.%03lu %s(%s)\n", __func__, w / 1000, w % 1000, | |
234 | scf_prim_name[scfsp->scfs_prim], | |
235 | scfsp->scfs_wait ? "wait" : "nowait"); | |
236 | oldw = scfsp->scfs_weight; | |
237 | } | |
238 | } | |
239 | ||
240 | // Randomly pick a primitive and wait/nowait, based on weightings. | |
241 | static struct scf_selector *scf_sel_rand(struct torture_random_state *trsp) | |
242 | { | |
243 | int i; | |
244 | unsigned long w = torture_random(trsp) % (scf_sel_totweight + 1); | |
245 | ||
246 | for (i = 0; i < scf_sel_array_len; i++) | |
247 | if (scf_sel_array[i].scfs_weight >= w) | |
248 | return &scf_sel_array[i]; | |
249 | WARN_ON_ONCE(1); | |
250 | return &scf_sel_array[0]; | |
251 | } | |
252 | ||
e9d338a0 PM |
253 | // Update statistics and occasionally burn up mass quantities of CPU time, |
254 | // if told to do so via scftorture.longwait. Otherwise, occasionally burn | |
255 | // a little bit. | |
b93e21a5 | 256 | static void scf_handler(void *scfc_in) |
e9d338a0 PM |
257 | { |
258 | int i; | |
259 | int j; | |
260 | unsigned long r = torture_random(this_cpu_ptr(&scf_torture_rand)); | |
b93e21a5 | 261 | struct scf_check *scfcp = scfc_in; |
e9d338a0 | 262 | |
980205ee PM |
263 | if (likely(scfcp)) { |
264 | WRITE_ONCE(scfcp->scfc_out, false); // For multiple receivers. | |
265 | if (WARN_ON_ONCE(unlikely(!READ_ONCE(scfcp->scfc_in)))) | |
266 | atomic_inc(&n_mb_in_errs); | |
267 | } | |
e9d338a0 PM |
268 | this_cpu_inc(scf_invoked_count); |
269 | if (longwait <= 0) { | |
8106bddb | 270 | if (!(r & 0xffc0)) { |
e9d338a0 | 271 | udelay(r & 0x3f); |
8106bddb PM |
272 | goto out; |
273 | } | |
e9d338a0 PM |
274 | } |
275 | if (r & 0xfff) | |
b93e21a5 | 276 | goto out; |
e9d338a0 PM |
277 | r = (r >> 12); |
278 | if (longwait <= 0) { | |
279 | udelay((r & 0xff) + 1); | |
b93e21a5 | 280 | goto out; |
e9d338a0 PM |
281 | } |
282 | r = r % longwait + 1; | |
283 | for (i = 0; i < r; i++) { | |
284 | for (j = 0; j < 1000; j++) { | |
285 | udelay(1000); | |
286 | cpu_relax(); | |
287 | } | |
288 | } | |
b93e21a5 PM |
289 | out: |
290 | if (unlikely(!scfcp)) | |
291 | return; | |
9b9a8067 | 292 | if (scfcp->scfc_wait) { |
b93e21a5 | 293 | WRITE_ONCE(scfcp->scfc_out, true); |
9b9a8067 PM |
294 | if (scfcp->scfc_rpc) |
295 | complete(&scfcp->scfc_completion); | |
296 | } else { | |
b93e21a5 | 297 | kfree(scfcp); |
9b9a8067 | 298 | } |
e9d338a0 PM |
299 | } |
300 | ||
5022b8ac | 301 | // As above, but check for correct CPU. |
b93e21a5 | 302 | static void scf_handler_1(void *scfc_in) |
5022b8ac | 303 | { |
b93e21a5 PM |
304 | struct scf_check *scfcp = scfc_in; |
305 | ||
306 | 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 | 307 | atomic_inc(&n_errs); |
b93e21a5 PM |
308 | } |
309 | scf_handler(scfcp); | |
5022b8ac PM |
310 | } |
311 | ||
e9d338a0 | 312 | // Randomly do an smp_call_function*() invocation. |
5022b8ac | 313 | static void scftorture_invoke_one(struct scf_statistics *scfp, struct torture_random_state *trsp) |
e9d338a0 | 314 | { |
5022b8ac | 315 | uintptr_t cpu; |
676e5469 | 316 | int ret = 0; |
b93e21a5 | 317 | struct scf_check *scfcp = NULL; |
5022b8ac PM |
318 | struct scf_selector *scfsp = scf_sel_rand(trsp); |
319 | ||
e9d338a0 PM |
320 | if (use_cpus_read_lock) |
321 | cpus_read_lock(); | |
322 | else | |
323 | preempt_disable(); | |
34e8c483 | 324 | if (scfsp->scfs_prim == SCF_PRIM_SINGLE || scfsp->scfs_wait) { |
b93e21a5 | 325 | scfcp = kmalloc(sizeof(*scfcp), GFP_ATOMIC); |
4df55bdd | 326 | if (WARN_ON_ONCE(!scfcp)) { |
b93e21a5 | 327 | atomic_inc(&n_alloc_errs); |
4df55bdd PM |
328 | } else { |
329 | scfcp->scfc_cpu = -1; | |
330 | scfcp->scfc_wait = scfsp->scfs_wait; | |
331 | scfcp->scfc_out = false; | |
9b9a8067 | 332 | scfcp->scfc_rpc = false; |
4df55bdd | 333 | } |
34e8c483 PM |
334 | } |
335 | switch (scfsp->scfs_prim) { | |
1ac78b49 PM |
336 | case SCF_PRIM_RESCHED: |
337 | if (IS_BUILTIN(CONFIG_SCF_TORTURE_TEST)) { | |
338 | cpu = torture_random(trsp) % nr_cpu_ids; | |
339 | scfp->n_resched++; | |
340 | resched_cpu(cpu); | |
c3d0258d | 341 | this_cpu_inc(scf_invoked_count); |
1ac78b49 PM |
342 | } |
343 | break; | |
34e8c483 | 344 | case SCF_PRIM_SINGLE: |
5022b8ac PM |
345 | cpu = torture_random(trsp) % nr_cpu_ids; |
346 | if (scfsp->scfs_wait) | |
347 | scfp->n_single_wait++; | |
348 | else | |
349 | scfp->n_single++; | |
b93e21a5 PM |
350 | if (scfcp) { |
351 | scfcp->scfc_cpu = cpu; | |
ee7035d2 | 352 | barrier(); // Prevent race-reduction compiler optimizations. |
b93e21a5 PM |
353 | scfcp->scfc_in = true; |
354 | } | |
355 | ret = smp_call_function_single(cpu, scf_handler_1, (void *)scfcp, scfsp->scfs_wait); | |
5022b8ac PM |
356 | if (ret) { |
357 | if (scfsp->scfs_wait) | |
358 | scfp->n_single_wait_ofl++; | |
359 | else | |
360 | scfp->n_single_ofl++; | |
b93e21a5 | 361 | kfree(scfcp); |
676e5469 | 362 | scfcp = NULL; |
5022b8ac PM |
363 | } |
364 | break; | |
9b9a8067 PM |
365 | case SCF_PRIM_SINGLE_RPC: |
366 | if (!scfcp) | |
367 | break; | |
368 | cpu = torture_random(trsp) % nr_cpu_ids; | |
369 | scfp->n_single_rpc++; | |
370 | scfcp->scfc_cpu = cpu; | |
371 | scfcp->scfc_wait = true; | |
372 | init_completion(&scfcp->scfc_completion); | |
373 | scfcp->scfc_rpc = true; | |
374 | barrier(); // Prevent race-reduction compiler optimizations. | |
375 | scfcp->scfc_in = true; | |
376 | ret = smp_call_function_single(cpu, scf_handler_1, (void *)scfcp, 0); | |
377 | if (!ret) { | |
378 | if (use_cpus_read_lock) | |
379 | cpus_read_unlock(); | |
380 | else | |
381 | preempt_enable(); | |
382 | wait_for_completion(&scfcp->scfc_completion); | |
383 | if (use_cpus_read_lock) | |
384 | cpus_read_lock(); | |
385 | else | |
386 | preempt_disable(); | |
387 | } else { | |
388 | scfp->n_single_rpc_ofl++; | |
389 | kfree(scfcp); | |
390 | scfcp = NULL; | |
391 | } | |
392 | break; | |
5022b8ac PM |
393 | case SCF_PRIM_MANY: |
394 | if (scfsp->scfs_wait) | |
395 | scfp->n_many_wait++; | |
396 | else | |
397 | scfp->n_many++; | |
ee7035d2 PM |
398 | if (scfcp) { |
399 | barrier(); // Prevent race-reduction compiler optimizations. | |
980205ee | 400 | scfcp->scfc_in = true; |
ee7035d2 | 401 | } |
980205ee | 402 | smp_call_function_many(cpu_online_mask, scf_handler, scfcp, scfsp->scfs_wait); |
5022b8ac PM |
403 | break; |
404 | case SCF_PRIM_ALL: | |
405 | if (scfsp->scfs_wait) | |
406 | scfp->n_all_wait++; | |
407 | else | |
408 | scfp->n_all++; | |
ee7035d2 PM |
409 | if (scfcp) { |
410 | barrier(); // Prevent race-reduction compiler optimizations. | |
34e8c483 | 411 | scfcp->scfc_in = true; |
ee7035d2 | 412 | } |
34e8c483 | 413 | smp_call_function(scf_handler, scfcp, scfsp->scfs_wait); |
5022b8ac | 414 | break; |
de77d4da PM |
415 | default: |
416 | WARN_ON_ONCE(1); | |
417 | if (scfcp) | |
418 | scfcp->scfc_out = true; | |
5022b8ac | 419 | } |
676e5469 | 420 | if (scfcp && scfsp->scfs_wait) { |
9e66bf03 | 421 | if (WARN_ON_ONCE((num_online_cpus() > 1 || scfsp->scfs_prim == SCF_PRIM_SINGLE) && |
9b9a8067 PM |
422 | !scfcp->scfc_out)) { |
423 | pr_warn("%s: Memory-ordering failure, scfs_prim: %d.\n", __func__, scfsp->scfs_prim); | |
676e5469 | 424 | atomic_inc(&n_mb_out_errs); // Leak rather than trash! |
9b9a8067 | 425 | } else { |
676e5469 | 426 | kfree(scfcp); |
9b9a8067 | 427 | } |
ee7035d2 | 428 | barrier(); // Prevent race-reduction compiler optimizations. |
676e5469 | 429 | } |
e9d338a0 PM |
430 | if (use_cpus_read_lock) |
431 | cpus_read_unlock(); | |
432 | else | |
433 | preempt_enable(); | |
434 | if (!(torture_random(trsp) & 0xfff)) | |
435 | schedule_timeout_uninterruptible(1); | |
436 | } | |
437 | ||
438 | // SCF test kthread. Repeatedly does calls to members of the | |
439 | // smp_call_function() family of functions. | |
440 | static int scftorture_invoker(void *arg) | |
441 | { | |
a7c072ef | 442 | int cpu; |
f3ea978b | 443 | int curcpu; |
e9d338a0 PM |
444 | DEFINE_TORTURE_RANDOM(rand); |
445 | struct scf_statistics *scfp = (struct scf_statistics *)arg; | |
a7c072ef | 446 | bool was_offline = false; |
e9d338a0 PM |
447 | |
448 | VERBOSE_SCFTORTOUT("scftorture_invoker %d: task started", scfp->cpu); | |
a7c072ef | 449 | cpu = scfp->cpu % nr_cpu_ids; |
22b6d149 | 450 | WARN_ON_ONCE(set_cpus_allowed_ptr(current, cpumask_of(cpu))); |
e9d338a0 PM |
451 | set_user_nice(current, MAX_NICE); |
452 | if (holdoff) | |
453 | schedule_timeout_interruptible(holdoff * HZ); | |
454 | ||
22b6d149 | 455 | VERBOSE_SCFTORTOUT("scftorture_invoker %d: Waiting for all SCF torturers from cpu %d", scfp->cpu, raw_smp_processor_id()); |
e9d338a0 PM |
456 | |
457 | // Make sure that the CPU is affinitized appropriately during testing. | |
22b6d149 | 458 | curcpu = raw_smp_processor_id(); |
f3ea978b PM |
459 | WARN_ONCE(curcpu != scfp->cpu % nr_cpu_ids, |
460 | "%s: Wanted CPU %d, running on %d, nr_cpu_ids = %d\n", | |
461 | __func__, scfp->cpu, curcpu, nr_cpu_ids); | |
e9d338a0 PM |
462 | |
463 | if (!atomic_dec_return(&n_started)) | |
464 | while (atomic_read_acquire(&n_started)) { | |
465 | if (torture_must_stop()) { | |
466 | VERBOSE_SCFTORTOUT("scftorture_invoker %d ended before starting", scfp->cpu); | |
467 | goto end; | |
468 | } | |
469 | schedule_timeout_uninterruptible(1); | |
470 | } | |
471 | ||
472 | VERBOSE_SCFTORTOUT("scftorture_invoker %d started", scfp->cpu); | |
473 | ||
474 | do { | |
475 | scftorture_invoke_one(scfp, &rand); | |
a7c072ef PM |
476 | while (cpu_is_offline(cpu) && !torture_must_stop()) { |
477 | schedule_timeout_interruptible(HZ / 5); | |
478 | was_offline = true; | |
479 | } | |
480 | if (was_offline) { | |
481 | set_cpus_allowed_ptr(current, cpumask_of(cpu)); | |
482 | was_offline = false; | |
483 | } | |
65bd77f5 | 484 | cond_resched(); |
85558182 | 485 | stutter_wait("scftorture_invoker"); |
e9d338a0 PM |
486 | } while (!torture_must_stop()); |
487 | ||
488 | VERBOSE_SCFTORTOUT("scftorture_invoker %d ended", scfp->cpu); | |
489 | end: | |
490 | torture_kthread_stopping("scftorture_invoker"); | |
491 | return 0; | |
492 | } | |
493 | ||
494 | static void | |
495 | scftorture_print_module_parms(const char *tag) | |
496 | { | |
497 | pr_alert(SCFTORT_FLAG | |
9b9a8067 PM |
498 | "--- %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, |
499 | 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 |
500 | } |
501 | ||
502 | static void scf_cleanup_handler(void *unused) | |
503 | { | |
504 | } | |
505 | ||
506 | static void scf_torture_cleanup(void) | |
507 | { | |
508 | int i; | |
509 | ||
510 | if (torture_cleanup_begin()) | |
511 | return; | |
512 | ||
513 | WRITE_ONCE(scfdone, true); | |
586e4d41 | 514 | if (nthreads && scf_stats_p) |
e9d338a0 PM |
515 | for (i = 0; i < nthreads; i++) |
516 | torture_stop_kthread("scftorture_invoker", scf_stats_p[i].task); | |
517 | else | |
518 | goto end; | |
e9d338a0 PM |
519 | smp_call_function(scf_cleanup_handler, NULL, 0); |
520 | torture_stop_kthread(scf_torture_stats, scf_torture_stats_task); | |
521 | scf_torture_stats_print(); // -After- the stats thread is stopped! | |
dba3142b PM |
522 | kfree(scf_stats_p); // -After- the last stats print has completed! |
523 | scf_stats_p = NULL; | |
e9d338a0 | 524 | |
dbf83b65 | 525 | if (atomic_read(&n_errs) || atomic_read(&n_mb_in_errs) || atomic_read(&n_mb_out_errs)) |
e9d338a0 PM |
526 | scftorture_print_module_parms("End of test: FAILURE"); |
527 | else if (torture_onoff_failures()) | |
528 | scftorture_print_module_parms("End of test: LOCK_HOTPLUG"); | |
529 | else | |
530 | scftorture_print_module_parms("End of test: SUCCESS"); | |
531 | ||
532 | end: | |
533 | torture_cleanup_end(); | |
534 | } | |
535 | ||
536 | static int __init scf_torture_init(void) | |
537 | { | |
538 | long i; | |
539 | int firsterr = 0; | |
1ac78b49 | 540 | unsigned long weight_resched1 = weight_resched; |
5022b8ac | 541 | unsigned long weight_single1 = weight_single; |
9b9a8067 | 542 | unsigned long weight_single_rpc1 = weight_single_rpc; |
5022b8ac PM |
543 | unsigned long weight_single_wait1 = weight_single_wait; |
544 | unsigned long weight_many1 = weight_many; | |
545 | unsigned long weight_many_wait1 = weight_many_wait; | |
546 | unsigned long weight_all1 = weight_all; | |
547 | unsigned long weight_all_wait1 = weight_all_wait; | |
e9d338a0 PM |
548 | |
549 | if (!torture_init_begin(SCFTORT_STRING, verbose)) | |
550 | return -EBUSY; | |
551 | ||
552 | scftorture_print_module_parms("Start of test"); | |
553 | ||
2f611d04 PM |
554 | if (weight_resched <= 0 && |
555 | weight_single <= 0 && weight_single_rpc <= 0 && weight_single_wait <= 0 && | |
556 | weight_many <= 0 && weight_many_wait <= 0 && | |
557 | weight_all <= 0 && weight_all_wait <= 0) { | |
558 | weight_resched1 = weight_resched == 0 ? 0 : 2 * nr_cpu_ids; | |
559 | weight_single1 = weight_single == 0 ? 0 : 2 * nr_cpu_ids; | |
560 | weight_single_rpc1 = weight_single_rpc == 0 ? 0 : 2 * nr_cpu_ids; | |
561 | weight_single_wait1 = weight_single_wait == 0 ? 0 : 2 * nr_cpu_ids; | |
562 | weight_many1 = weight_many == 0 ? 0 : 2; | |
563 | weight_many_wait1 = weight_many_wait == 0 ? 0 : 2; | |
564 | weight_all1 = weight_all == 0 ? 0 : 1; | |
565 | weight_all_wait1 = weight_all_wait == 0 ? 0 : 1; | |
e9d338a0 | 566 | } else { |
1ac78b49 PM |
567 | if (weight_resched == -1) |
568 | weight_resched1 = 0; | |
e9d338a0 | 569 | if (weight_single == -1) |
5022b8ac | 570 | weight_single1 = 0; |
9b9a8067 PM |
571 | if (weight_single_rpc == -1) |
572 | weight_single_rpc1 = 0; | |
e9d338a0 | 573 | if (weight_single_wait == -1) |
5022b8ac PM |
574 | weight_single_wait1 = 0; |
575 | if (weight_many == -1) | |
576 | weight_many1 = 0; | |
577 | if (weight_many_wait == -1) | |
578 | weight_many_wait1 = 0; | |
e9d338a0 | 579 | if (weight_all == -1) |
5022b8ac | 580 | weight_all1 = 0; |
e9d338a0 | 581 | if (weight_all_wait == -1) |
5022b8ac | 582 | weight_all_wait1 = 0; |
e9d338a0 | 583 | } |
da9366c6 PM |
584 | if (weight_resched1 == 0 && weight_single1 == 0 && weight_single_rpc1 == 0 && |
585 | weight_single_wait1 == 0 && weight_many1 == 0 && weight_many_wait1 == 0 && | |
5022b8ac | 586 | weight_all1 == 0 && weight_all_wait1 == 0) { |
809da9bf | 587 | SCFTORTOUT_ERRSTRING("all zero weights makes no sense"); |
e9d338a0 PM |
588 | firsterr = -EINVAL; |
589 | goto unwind; | |
590 | } | |
1ac78b49 PM |
591 | if (IS_BUILTIN(CONFIG_SCF_TORTURE_TEST)) |
592 | scf_sel_add(weight_resched1, SCF_PRIM_RESCHED, false); | |
593 | else if (weight_resched1) | |
809da9bf | 594 | SCFTORTOUT_ERRSTRING("built as module, weight_resched ignored"); |
5022b8ac | 595 | scf_sel_add(weight_single1, SCF_PRIM_SINGLE, false); |
9b9a8067 | 596 | scf_sel_add(weight_single_rpc1, SCF_PRIM_SINGLE_RPC, true); |
5022b8ac PM |
597 | scf_sel_add(weight_single_wait1, SCF_PRIM_SINGLE, true); |
598 | scf_sel_add(weight_many1, SCF_PRIM_MANY, false); | |
599 | scf_sel_add(weight_many_wait1, SCF_PRIM_MANY, true); | |
600 | scf_sel_add(weight_all1, SCF_PRIM_ALL, false); | |
601 | scf_sel_add(weight_all_wait1, SCF_PRIM_ALL, true); | |
602 | scf_sel_dump(); | |
e9d338a0 PM |
603 | |
604 | if (onoff_interval > 0) { | |
605 | firsterr = torture_onoff_init(onoff_holdoff * HZ, onoff_interval, NULL); | |
f2bdf7dc | 606 | if (torture_init_error(firsterr)) |
e9d338a0 PM |
607 | goto unwind; |
608 | } | |
609 | if (shutdown_secs > 0) { | |
610 | firsterr = torture_shutdown_init(shutdown_secs, scf_torture_cleanup); | |
f2bdf7dc | 611 | if (torture_init_error(firsterr)) |
e9d338a0 PM |
612 | goto unwind; |
613 | } | |
85558182 PM |
614 | if (stutter > 0) { |
615 | firsterr = torture_stutter_init(stutter, stutter); | |
f2bdf7dc | 616 | if (torture_init_error(firsterr)) |
85558182 PM |
617 | goto unwind; |
618 | } | |
e9d338a0 PM |
619 | |
620 | // Worker tasks invoking smp_call_function(). | |
621 | if (nthreads < 0) | |
622 | nthreads = num_online_cpus(); | |
623 | scf_stats_p = kcalloc(nthreads, sizeof(scf_stats_p[0]), GFP_KERNEL); | |
624 | if (!scf_stats_p) { | |
809da9bf | 625 | SCFTORTOUT_ERRSTRING("out of memory"); |
e9d338a0 PM |
626 | firsterr = -ENOMEM; |
627 | goto unwind; | |
628 | } | |
629 | ||
71f6ea2a | 630 | VERBOSE_SCFTORTOUT("Starting %d smp_call_function() threads", nthreads); |
e9d338a0 PM |
631 | |
632 | atomic_set(&n_started, nthreads); | |
633 | for (i = 0; i < nthreads; i++) { | |
634 | scf_stats_p[i].cpu = i; | |
635 | firsterr = torture_create_kthread(scftorture_invoker, (void *)&scf_stats_p[i], | |
636 | scf_stats_p[i].task); | |
f2bdf7dc | 637 | if (torture_init_error(firsterr)) |
e9d338a0 PM |
638 | goto unwind; |
639 | } | |
640 | if (stat_interval > 0) { | |
641 | firsterr = torture_create_kthread(scf_torture_stats, NULL, scf_torture_stats_task); | |
f2bdf7dc | 642 | if (torture_init_error(firsterr)) |
e9d338a0 PM |
643 | goto unwind; |
644 | } | |
645 | ||
646 | torture_init_end(); | |
647 | return 0; | |
648 | ||
649 | unwind: | |
650 | torture_init_end(); | |
651 | scf_torture_cleanup(); | |
2b1388f8 PM |
652 | if (shutdown_secs) { |
653 | WARN_ON(!IS_MODULE(CONFIG_SCF_TORTURE_TEST)); | |
654 | kernel_power_off(); | |
655 | } | |
e9d338a0 PM |
656 | return firsterr; |
657 | } | |
658 | ||
659 | module_init(scf_torture_init); | |
660 | module_exit(scf_torture_cleanup); |