Luis R. Rodriguez | d9c6a72 | 2017-07-14 14:50:08 -0700 | [diff] [blame] | 1 | /* |
| 2 | * kmod stress test driver |
| 3 | * |
| 4 | * Copyright (C) 2017 Luis R. Rodriguez <mcgrof@kernel.org> |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify it |
| 7 | * under the terms of the GNU General Public License as published by the Free |
| 8 | * Software Foundation; either version 2 of the License, or at your option any |
| 9 | * later version; or, when distributed separately from the Linux kernel or |
| 10 | * when incorporated into other software packages, subject to the following |
| 11 | * license: |
| 12 | * |
| 13 | * This program is free software; you can redistribute it and/or modify it |
| 14 | * under the terms of copyleft-next (version 0.3.1 or later) as published |
| 15 | * at http://copyleft-next.org/. |
| 16 | */ |
| 17 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| 18 | |
| 19 | /* |
| 20 | * This driver provides an interface to trigger and test the kernel's |
| 21 | * module loader through a series of configurations and a few triggers. |
| 22 | * To test this driver use the following script as root: |
| 23 | * |
| 24 | * tools/testing/selftests/kmod/kmod.sh --help |
| 25 | */ |
| 26 | |
| 27 | #include <linux/kernel.h> |
| 28 | #include <linux/module.h> |
| 29 | #include <linux/kmod.h> |
| 30 | #include <linux/printk.h> |
| 31 | #include <linux/kthread.h> |
| 32 | #include <linux/sched.h> |
| 33 | #include <linux/fs.h> |
| 34 | #include <linux/miscdevice.h> |
| 35 | #include <linux/vmalloc.h> |
| 36 | #include <linux/slab.h> |
| 37 | #include <linux/device.h> |
| 38 | |
| 39 | #define TEST_START_NUM_THREADS 50 |
| 40 | #define TEST_START_DRIVER "test_module" |
| 41 | #define TEST_START_TEST_FS "xfs" |
| 42 | #define TEST_START_TEST_CASE TEST_KMOD_DRIVER |
| 43 | |
| 44 | |
| 45 | static bool force_init_test = false; |
| 46 | module_param(force_init_test, bool_enable_only, 0644); |
| 47 | MODULE_PARM_DESC(force_init_test, |
| 48 | "Force kicking a test immediately after driver loads"); |
| 49 | |
| 50 | /* |
| 51 | * For device allocation / registration |
| 52 | */ |
| 53 | static DEFINE_MUTEX(reg_dev_mutex); |
| 54 | static LIST_HEAD(reg_test_devs); |
| 55 | |
| 56 | /* |
| 57 | * num_test_devs actually represents the *next* ID of the next |
| 58 | * device we will allow to create. |
| 59 | */ |
| 60 | static int num_test_devs; |
| 61 | |
| 62 | /** |
| 63 | * enum kmod_test_case - linker table test case |
| 64 | * |
| 65 | * If you add a test case, please be sure to review if you need to se |
| 66 | * @need_mod_put for your tests case. |
| 67 | * |
| 68 | * @TEST_KMOD_DRIVER: stress tests request_module() |
| 69 | * @TEST_KMOD_FS_TYPE: stress tests get_fs_type() |
| 70 | */ |
| 71 | enum kmod_test_case { |
| 72 | __TEST_KMOD_INVALID = 0, |
| 73 | |
| 74 | TEST_KMOD_DRIVER, |
| 75 | TEST_KMOD_FS_TYPE, |
| 76 | |
| 77 | __TEST_KMOD_MAX, |
| 78 | }; |
| 79 | |
| 80 | struct test_config { |
| 81 | char *test_driver; |
| 82 | char *test_fs; |
| 83 | unsigned int num_threads; |
| 84 | enum kmod_test_case test_case; |
| 85 | int test_result; |
| 86 | }; |
| 87 | |
| 88 | struct kmod_test_device; |
| 89 | |
| 90 | /** |
| 91 | * kmod_test_device_info - thread info |
| 92 | * |
| 93 | * @ret_sync: return value if request_module() is used, sync request for |
| 94 | * @TEST_KMOD_DRIVER |
| 95 | * @fs_sync: return value of get_fs_type() for @TEST_KMOD_FS_TYPE |
| 96 | * @thread_idx: thread ID |
| 97 | * @test_dev: test device test is being performed under |
| 98 | * @need_mod_put: Some tests (get_fs_type() is one) requires putting the module |
| 99 | * (module_put(fs_sync->owner)) when done, otherwise you will not be able |
| 100 | * to unload the respective modules and re-test. We use this to keep |
| 101 | * accounting of when we need this and to help out in case we need to |
| 102 | * error out and deal with module_put() on error. |
| 103 | */ |
| 104 | struct kmod_test_device_info { |
| 105 | int ret_sync; |
| 106 | struct file_system_type *fs_sync; |
| 107 | struct task_struct *task_sync; |
| 108 | unsigned int thread_idx; |
| 109 | struct kmod_test_device *test_dev; |
| 110 | bool need_mod_put; |
| 111 | }; |
| 112 | |
| 113 | /** |
| 114 | * kmod_test_device - test device to help test kmod |
| 115 | * |
| 116 | * @dev_idx: unique ID for test device |
| 117 | * @config: configuration for the test |
| 118 | * @misc_dev: we use a misc device under the hood |
| 119 | * @dev: pointer to misc_dev's own struct device |
| 120 | * @config_mutex: protects configuration of test |
| 121 | * @trigger_mutex: the test trigger can only be fired once at a time |
| 122 | * @thread_lock: protects @done count, and the @info per each thread |
| 123 | * @done: number of threads which have completed or failed |
| 124 | * @test_is_oom: when we run out of memory, use this to halt moving forward |
| 125 | * @kthreads_done: completion used to signal when all work is done |
| 126 | * @list: needed to be part of the reg_test_devs |
| 127 | * @info: array of info for each thread |
| 128 | */ |
| 129 | struct kmod_test_device { |
| 130 | int dev_idx; |
| 131 | struct test_config config; |
| 132 | struct miscdevice misc_dev; |
| 133 | struct device *dev; |
| 134 | struct mutex config_mutex; |
| 135 | struct mutex trigger_mutex; |
| 136 | struct mutex thread_mutex; |
| 137 | |
| 138 | unsigned int done; |
| 139 | |
| 140 | bool test_is_oom; |
| 141 | struct completion kthreads_done; |
| 142 | struct list_head list; |
| 143 | |
| 144 | struct kmod_test_device_info *info; |
| 145 | }; |
| 146 | |
| 147 | static const char *test_case_str(enum kmod_test_case test_case) |
| 148 | { |
| 149 | switch (test_case) { |
| 150 | case TEST_KMOD_DRIVER: |
| 151 | return "TEST_KMOD_DRIVER"; |
| 152 | case TEST_KMOD_FS_TYPE: |
| 153 | return "TEST_KMOD_FS_TYPE"; |
| 154 | default: |
| 155 | return "invalid"; |
| 156 | } |
| 157 | } |
| 158 | |
| 159 | static struct miscdevice *dev_to_misc_dev(struct device *dev) |
| 160 | { |
| 161 | return dev_get_drvdata(dev); |
| 162 | } |
| 163 | |
| 164 | static struct kmod_test_device *misc_dev_to_test_dev(struct miscdevice *misc_dev) |
| 165 | { |
| 166 | return container_of(misc_dev, struct kmod_test_device, misc_dev); |
| 167 | } |
| 168 | |
| 169 | static struct kmod_test_device *dev_to_test_dev(struct device *dev) |
| 170 | { |
| 171 | struct miscdevice *misc_dev; |
| 172 | |
| 173 | misc_dev = dev_to_misc_dev(dev); |
| 174 | |
| 175 | return misc_dev_to_test_dev(misc_dev); |
| 176 | } |
| 177 | |
| 178 | /* Must run with thread_mutex held */ |
| 179 | static void kmod_test_done_check(struct kmod_test_device *test_dev, |
| 180 | unsigned int idx) |
| 181 | { |
| 182 | struct test_config *config = &test_dev->config; |
| 183 | |
| 184 | test_dev->done++; |
| 185 | dev_dbg(test_dev->dev, "Done thread count: %u\n", test_dev->done); |
| 186 | |
| 187 | if (test_dev->done == config->num_threads) { |
| 188 | dev_info(test_dev->dev, "Done: %u threads have all run now\n", |
| 189 | test_dev->done); |
| 190 | dev_info(test_dev->dev, "Last thread to run: %u\n", idx); |
| 191 | complete(&test_dev->kthreads_done); |
| 192 | } |
| 193 | } |
| 194 | |
| 195 | static void test_kmod_put_module(struct kmod_test_device_info *info) |
| 196 | { |
| 197 | struct kmod_test_device *test_dev = info->test_dev; |
| 198 | struct test_config *config = &test_dev->config; |
| 199 | |
| 200 | if (!info->need_mod_put) |
| 201 | return; |
| 202 | |
| 203 | switch (config->test_case) { |
| 204 | case TEST_KMOD_DRIVER: |
| 205 | break; |
| 206 | case TEST_KMOD_FS_TYPE: |
| 207 | if (info && info->fs_sync && info->fs_sync->owner) |
| 208 | module_put(info->fs_sync->owner); |
| 209 | break; |
| 210 | default: |
| 211 | BUG(); |
| 212 | } |
| 213 | |
| 214 | info->need_mod_put = true; |
| 215 | } |
| 216 | |
| 217 | static int run_request(void *data) |
| 218 | { |
| 219 | struct kmod_test_device_info *info = data; |
| 220 | struct kmod_test_device *test_dev = info->test_dev; |
| 221 | struct test_config *config = &test_dev->config; |
| 222 | |
| 223 | switch (config->test_case) { |
| 224 | case TEST_KMOD_DRIVER: |
| 225 | info->ret_sync = request_module("%s", config->test_driver); |
| 226 | break; |
| 227 | case TEST_KMOD_FS_TYPE: |
| 228 | info->fs_sync = get_fs_type(config->test_fs); |
| 229 | info->need_mod_put = true; |
| 230 | break; |
| 231 | default: |
| 232 | /* __trigger_config_run() already checked for test sanity */ |
| 233 | BUG(); |
| 234 | return -EINVAL; |
| 235 | } |
| 236 | |
| 237 | dev_dbg(test_dev->dev, "Ran thread %u\n", info->thread_idx); |
| 238 | |
| 239 | test_kmod_put_module(info); |
| 240 | |
| 241 | mutex_lock(&test_dev->thread_mutex); |
| 242 | info->task_sync = NULL; |
| 243 | kmod_test_done_check(test_dev, info->thread_idx); |
| 244 | mutex_unlock(&test_dev->thread_mutex); |
| 245 | |
| 246 | return 0; |
| 247 | } |
| 248 | |
| 249 | static int tally_work_test(struct kmod_test_device_info *info) |
| 250 | { |
| 251 | struct kmod_test_device *test_dev = info->test_dev; |
| 252 | struct test_config *config = &test_dev->config; |
| 253 | int err_ret = 0; |
| 254 | |
| 255 | switch (config->test_case) { |
| 256 | case TEST_KMOD_DRIVER: |
| 257 | /* |
| 258 | * Only capture errors, if one is found that's |
| 259 | * enough, for now. |
| 260 | */ |
| 261 | if (info->ret_sync != 0) |
| 262 | err_ret = info->ret_sync; |
| 263 | dev_info(test_dev->dev, |
| 264 | "Sync thread %d return status: %d\n", |
| 265 | info->thread_idx, info->ret_sync); |
| 266 | break; |
| 267 | case TEST_KMOD_FS_TYPE: |
| 268 | /* For now we make this simple */ |
| 269 | if (!info->fs_sync) |
| 270 | err_ret = -EINVAL; |
| 271 | dev_info(test_dev->dev, "Sync thread %u fs: %s\n", |
| 272 | info->thread_idx, info->fs_sync ? config->test_fs : |
| 273 | "NULL"); |
| 274 | break; |
| 275 | default: |
| 276 | BUG(); |
| 277 | } |
| 278 | |
| 279 | return err_ret; |
| 280 | } |
| 281 | |
| 282 | /* |
| 283 | * XXX: add result option to display if all errors did not match. |
| 284 | * For now we just keep any error code if one was found. |
| 285 | * |
| 286 | * If this ran it means *all* tasks were created fine and we |
| 287 | * are now just collecting results. |
| 288 | * |
| 289 | * Only propagate errors, do not override with a subsequent sucess case. |
| 290 | */ |
| 291 | static void tally_up_work(struct kmod_test_device *test_dev) |
| 292 | { |
| 293 | struct test_config *config = &test_dev->config; |
| 294 | struct kmod_test_device_info *info; |
| 295 | unsigned int idx; |
| 296 | int err_ret = 0; |
| 297 | int ret = 0; |
| 298 | |
| 299 | mutex_lock(&test_dev->thread_mutex); |
| 300 | |
| 301 | dev_info(test_dev->dev, "Results:\n"); |
| 302 | |
| 303 | for (idx=0; idx < config->num_threads; idx++) { |
| 304 | info = &test_dev->info[idx]; |
| 305 | ret = tally_work_test(info); |
| 306 | if (ret) |
| 307 | err_ret = ret; |
| 308 | } |
| 309 | |
| 310 | /* |
| 311 | * Note: request_module() returns 256 for a module not found even |
| 312 | * though modprobe itself returns 1. |
| 313 | */ |
| 314 | config->test_result = err_ret; |
| 315 | |
| 316 | mutex_unlock(&test_dev->thread_mutex); |
| 317 | } |
| 318 | |
| 319 | static int try_one_request(struct kmod_test_device *test_dev, unsigned int idx) |
| 320 | { |
| 321 | struct kmod_test_device_info *info = &test_dev->info[idx]; |
| 322 | int fail_ret = -ENOMEM; |
| 323 | |
| 324 | mutex_lock(&test_dev->thread_mutex); |
| 325 | |
| 326 | info->thread_idx = idx; |
| 327 | info->test_dev = test_dev; |
| 328 | info->task_sync = kthread_run(run_request, info, "%s-%u", |
| 329 | KBUILD_MODNAME, idx); |
| 330 | |
| 331 | if (!info->task_sync || IS_ERR(info->task_sync)) { |
| 332 | test_dev->test_is_oom = true; |
| 333 | dev_err(test_dev->dev, "Setting up thread %u failed\n", idx); |
| 334 | info->task_sync = NULL; |
| 335 | goto err_out; |
| 336 | } else |
| 337 | dev_dbg(test_dev->dev, "Kicked off thread %u\n", idx); |
| 338 | |
| 339 | mutex_unlock(&test_dev->thread_mutex); |
| 340 | |
| 341 | return 0; |
| 342 | |
| 343 | err_out: |
| 344 | info->ret_sync = fail_ret; |
| 345 | mutex_unlock(&test_dev->thread_mutex); |
| 346 | |
| 347 | return fail_ret; |
| 348 | } |
| 349 | |
| 350 | static void test_dev_kmod_stop_tests(struct kmod_test_device *test_dev) |
| 351 | { |
| 352 | struct test_config *config = &test_dev->config; |
| 353 | struct kmod_test_device_info *info; |
| 354 | unsigned int i; |
| 355 | |
| 356 | dev_info(test_dev->dev, "Ending request_module() tests\n"); |
| 357 | |
| 358 | mutex_lock(&test_dev->thread_mutex); |
| 359 | |
| 360 | for (i=0; i < config->num_threads; i++) { |
| 361 | info = &test_dev->info[i]; |
| 362 | if (info->task_sync && !IS_ERR(info->task_sync)) { |
| 363 | dev_info(test_dev->dev, |
| 364 | "Stopping still-running thread %i\n", i); |
| 365 | kthread_stop(info->task_sync); |
| 366 | } |
| 367 | |
| 368 | /* |
| 369 | * info->task_sync is well protected, it can only be |
| 370 | * NULL or a pointer to a struct. If its NULL we either |
| 371 | * never ran, or we did and we completed the work. Completed |
| 372 | * tasks *always* put the module for us. This is a sanity |
| 373 | * check -- just in case. |
| 374 | */ |
| 375 | if (info->task_sync && info->need_mod_put) |
| 376 | test_kmod_put_module(info); |
| 377 | } |
| 378 | |
| 379 | mutex_unlock(&test_dev->thread_mutex); |
| 380 | } |
| 381 | |
| 382 | /* |
| 383 | * Only wait *iff* we did not run into any errors during all of our thread |
| 384 | * set up. If run into any issues we stop threads and just bail out with |
| 385 | * an error to the trigger. This also means we don't need any tally work |
| 386 | * for any threads which fail. |
| 387 | */ |
| 388 | static int try_requests(struct kmod_test_device *test_dev) |
| 389 | { |
| 390 | struct test_config *config = &test_dev->config; |
| 391 | unsigned int idx; |
| 392 | int ret; |
| 393 | bool any_error = false; |
| 394 | |
| 395 | for (idx=0; idx < config->num_threads; idx++) { |
| 396 | if (test_dev->test_is_oom) { |
| 397 | any_error = true; |
| 398 | break; |
| 399 | } |
| 400 | |
| 401 | ret = try_one_request(test_dev, idx); |
| 402 | if (ret) { |
| 403 | any_error = true; |
| 404 | break; |
| 405 | } |
| 406 | } |
| 407 | |
| 408 | if (!any_error) { |
| 409 | test_dev->test_is_oom = false; |
| 410 | dev_info(test_dev->dev, |
| 411 | "No errors were found while initializing threads\n"); |
| 412 | wait_for_completion(&test_dev->kthreads_done); |
| 413 | tally_up_work(test_dev); |
| 414 | } else { |
| 415 | test_dev->test_is_oom = true; |
| 416 | dev_info(test_dev->dev, |
| 417 | "At least one thread failed to start, stop all work\n"); |
| 418 | test_dev_kmod_stop_tests(test_dev); |
| 419 | return -ENOMEM; |
| 420 | } |
| 421 | |
| 422 | return 0; |
| 423 | } |
| 424 | |
| 425 | static int run_test_driver(struct kmod_test_device *test_dev) |
| 426 | { |
| 427 | struct test_config *config = &test_dev->config; |
| 428 | |
| 429 | dev_info(test_dev->dev, "Test case: %s (%u)\n", |
| 430 | test_case_str(config->test_case), |
| 431 | config->test_case); |
| 432 | dev_info(test_dev->dev, "Test driver to load: %s\n", |
| 433 | config->test_driver); |
| 434 | dev_info(test_dev->dev, "Number of threads to run: %u\n", |
| 435 | config->num_threads); |
| 436 | dev_info(test_dev->dev, "Thread IDs will range from 0 - %u\n", |
| 437 | config->num_threads - 1); |
| 438 | |
| 439 | return try_requests(test_dev); |
| 440 | } |
| 441 | |
| 442 | static int run_test_fs_type(struct kmod_test_device *test_dev) |
| 443 | { |
| 444 | struct test_config *config = &test_dev->config; |
| 445 | |
| 446 | dev_info(test_dev->dev, "Test case: %s (%u)\n", |
| 447 | test_case_str(config->test_case), |
| 448 | config->test_case); |
| 449 | dev_info(test_dev->dev, "Test filesystem to load: %s\n", |
| 450 | config->test_fs); |
| 451 | dev_info(test_dev->dev, "Number of threads to run: %u\n", |
| 452 | config->num_threads); |
| 453 | dev_info(test_dev->dev, "Thread IDs will range from 0 - %u\n", |
| 454 | config->num_threads - 1); |
| 455 | |
| 456 | return try_requests(test_dev); |
| 457 | } |
| 458 | |
| 459 | static ssize_t config_show(struct device *dev, |
| 460 | struct device_attribute *attr, |
| 461 | char *buf) |
| 462 | { |
| 463 | struct kmod_test_device *test_dev = dev_to_test_dev(dev); |
| 464 | struct test_config *config = &test_dev->config; |
| 465 | int len = 0; |
| 466 | |
| 467 | mutex_lock(&test_dev->config_mutex); |
| 468 | |
| 469 | len += snprintf(buf, PAGE_SIZE, |
| 470 | "Custom trigger configuration for: %s\n", |
| 471 | dev_name(dev)); |
| 472 | |
| 473 | len += snprintf(buf+len, PAGE_SIZE - len, |
| 474 | "Number of threads:\t%u\n", |
| 475 | config->num_threads); |
| 476 | |
| 477 | len += snprintf(buf+len, PAGE_SIZE - len, |
| 478 | "Test_case:\t%s (%u)\n", |
| 479 | test_case_str(config->test_case), |
| 480 | config->test_case); |
| 481 | |
| 482 | if (config->test_driver) |
| 483 | len += snprintf(buf+len, PAGE_SIZE - len, |
| 484 | "driver:\t%s\n", |
| 485 | config->test_driver); |
| 486 | else |
| 487 | len += snprintf(buf+len, PAGE_SIZE - len, |
Colin Ian King | a4afe8c | 2017-08-10 15:23:40 -0700 | [diff] [blame] | 488 | "driver:\tEMPTY\n"); |
Luis R. Rodriguez | d9c6a72 | 2017-07-14 14:50:08 -0700 | [diff] [blame] | 489 | |
| 490 | if (config->test_fs) |
| 491 | len += snprintf(buf+len, PAGE_SIZE - len, |
| 492 | "fs:\t%s\n", |
| 493 | config->test_fs); |
| 494 | else |
| 495 | len += snprintf(buf+len, PAGE_SIZE - len, |
Colin Ian King | a4afe8c | 2017-08-10 15:23:40 -0700 | [diff] [blame] | 496 | "fs:\tEMPTY\n"); |
Luis R. Rodriguez | d9c6a72 | 2017-07-14 14:50:08 -0700 | [diff] [blame] | 497 | |
| 498 | mutex_unlock(&test_dev->config_mutex); |
| 499 | |
| 500 | return len; |
| 501 | } |
| 502 | static DEVICE_ATTR_RO(config); |
| 503 | |
| 504 | /* |
| 505 | * This ensures we don't allow kicking threads through if our configuration |
| 506 | * is faulty. |
| 507 | */ |
| 508 | static int __trigger_config_run(struct kmod_test_device *test_dev) |
| 509 | { |
| 510 | struct test_config *config = &test_dev->config; |
| 511 | |
| 512 | test_dev->done = 0; |
| 513 | |
| 514 | switch (config->test_case) { |
| 515 | case TEST_KMOD_DRIVER: |
| 516 | return run_test_driver(test_dev); |
| 517 | case TEST_KMOD_FS_TYPE: |
| 518 | return run_test_fs_type(test_dev); |
| 519 | default: |
| 520 | dev_warn(test_dev->dev, |
| 521 | "Invalid test case requested: %u\n", |
| 522 | config->test_case); |
| 523 | return -EINVAL; |
| 524 | } |
| 525 | } |
| 526 | |
| 527 | static int trigger_config_run(struct kmod_test_device *test_dev) |
| 528 | { |
| 529 | struct test_config *config = &test_dev->config; |
| 530 | int ret; |
| 531 | |
| 532 | mutex_lock(&test_dev->trigger_mutex); |
| 533 | mutex_lock(&test_dev->config_mutex); |
| 534 | |
| 535 | ret = __trigger_config_run(test_dev); |
| 536 | if (ret < 0) |
| 537 | goto out; |
| 538 | dev_info(test_dev->dev, "General test result: %d\n", |
| 539 | config->test_result); |
| 540 | |
| 541 | /* |
| 542 | * We must return 0 after a trigger even unless something went |
| 543 | * wrong with the setup of the test. If the test setup went fine |
| 544 | * then userspace must just check the result of config->test_result. |
| 545 | * One issue with relying on the return from a call in the kernel |
| 546 | * is if the kernel returns a possitive value using this trigger |
| 547 | * will not return the value to userspace, it would be lost. |
| 548 | * |
| 549 | * By not relying on capturing the return value of tests we are using |
| 550 | * through the trigger it also us to run tests with set -e and only |
| 551 | * fail when something went wrong with the driver upon trigger |
| 552 | * requests. |
| 553 | */ |
| 554 | ret = 0; |
| 555 | |
| 556 | out: |
| 557 | mutex_unlock(&test_dev->config_mutex); |
| 558 | mutex_unlock(&test_dev->trigger_mutex); |
| 559 | |
| 560 | return ret; |
| 561 | } |
| 562 | |
| 563 | static ssize_t |
| 564 | trigger_config_store(struct device *dev, |
| 565 | struct device_attribute *attr, |
| 566 | const char *buf, size_t count) |
| 567 | { |
| 568 | struct kmod_test_device *test_dev = dev_to_test_dev(dev); |
| 569 | int ret; |
| 570 | |
| 571 | if (test_dev->test_is_oom) |
| 572 | return -ENOMEM; |
| 573 | |
| 574 | /* For all intents and purposes we don't care what userspace |
| 575 | * sent this trigger, we care only that we were triggered. |
| 576 | * We treat the return value only for caputuring issues with |
| 577 | * the test setup. At this point all the test variables should |
| 578 | * have been allocated so typically this should never fail. |
| 579 | */ |
| 580 | ret = trigger_config_run(test_dev); |
| 581 | if (unlikely(ret < 0)) |
| 582 | goto out; |
| 583 | |
| 584 | /* |
| 585 | * Note: any return > 0 will be treated as success |
| 586 | * and the error value will not be available to userspace. |
| 587 | * Do not rely on trying to send to userspace a test value |
| 588 | * return value as possitive return errors will be lost. |
| 589 | */ |
| 590 | if (WARN_ON(ret > 0)) |
| 591 | return -EINVAL; |
| 592 | |
| 593 | ret = count; |
| 594 | out: |
| 595 | return ret; |
| 596 | } |
| 597 | static DEVICE_ATTR_WO(trigger_config); |
| 598 | |
| 599 | /* |
| 600 | * XXX: move to kstrncpy() once merged. |
| 601 | * |
| 602 | * Users should use kfree_const() when freeing these. |
| 603 | */ |
| 604 | static int __kstrncpy(char **dst, const char *name, size_t count, gfp_t gfp) |
| 605 | { |
| 606 | *dst = kstrndup(name, count, gfp); |
| 607 | if (!*dst) |
| 608 | return -ENOSPC; |
| 609 | return count; |
| 610 | } |
| 611 | |
| 612 | static int config_copy_test_driver_name(struct test_config *config, |
| 613 | const char *name, |
| 614 | size_t count) |
| 615 | { |
| 616 | return __kstrncpy(&config->test_driver, name, count, GFP_KERNEL); |
| 617 | } |
| 618 | |
| 619 | |
| 620 | static int config_copy_test_fs(struct test_config *config, const char *name, |
| 621 | size_t count) |
| 622 | { |
| 623 | return __kstrncpy(&config->test_fs, name, count, GFP_KERNEL); |
| 624 | } |
| 625 | |
| 626 | static void __kmod_config_free(struct test_config *config) |
| 627 | { |
| 628 | if (!config) |
| 629 | return; |
| 630 | |
| 631 | kfree_const(config->test_driver); |
| 632 | config->test_driver = NULL; |
| 633 | |
| 634 | kfree_const(config->test_fs); |
| 635 | config->test_driver = NULL; |
| 636 | } |
| 637 | |
| 638 | static void kmod_config_free(struct kmod_test_device *test_dev) |
| 639 | { |
| 640 | struct test_config *config; |
| 641 | |
| 642 | if (!test_dev) |
| 643 | return; |
| 644 | |
| 645 | config = &test_dev->config; |
| 646 | |
| 647 | mutex_lock(&test_dev->config_mutex); |
| 648 | __kmod_config_free(config); |
| 649 | mutex_unlock(&test_dev->config_mutex); |
| 650 | } |
| 651 | |
| 652 | static ssize_t config_test_driver_store(struct device *dev, |
| 653 | struct device_attribute *attr, |
| 654 | const char *buf, size_t count) |
| 655 | { |
| 656 | struct kmod_test_device *test_dev = dev_to_test_dev(dev); |
| 657 | struct test_config *config = &test_dev->config; |
| 658 | int copied; |
| 659 | |
| 660 | mutex_lock(&test_dev->config_mutex); |
| 661 | |
| 662 | kfree_const(config->test_driver); |
| 663 | config->test_driver = NULL; |
| 664 | |
| 665 | copied = config_copy_test_driver_name(config, buf, count); |
| 666 | mutex_unlock(&test_dev->config_mutex); |
| 667 | |
| 668 | return copied; |
| 669 | } |
| 670 | |
| 671 | /* |
| 672 | * As per sysfs_kf_seq_show() the buf is max PAGE_SIZE. |
| 673 | */ |
| 674 | static ssize_t config_test_show_str(struct mutex *config_mutex, |
| 675 | char *dst, |
| 676 | char *src) |
| 677 | { |
| 678 | int len; |
| 679 | |
| 680 | mutex_lock(config_mutex); |
| 681 | len = snprintf(dst, PAGE_SIZE, "%s\n", src); |
| 682 | mutex_unlock(config_mutex); |
| 683 | |
| 684 | return len; |
| 685 | } |
| 686 | |
| 687 | static ssize_t config_test_driver_show(struct device *dev, |
| 688 | struct device_attribute *attr, |
| 689 | char *buf) |
| 690 | { |
| 691 | struct kmod_test_device *test_dev = dev_to_test_dev(dev); |
| 692 | struct test_config *config = &test_dev->config; |
| 693 | |
| 694 | return config_test_show_str(&test_dev->config_mutex, buf, |
| 695 | config->test_driver); |
| 696 | } |
| 697 | static DEVICE_ATTR(config_test_driver, 0644, config_test_driver_show, |
| 698 | config_test_driver_store); |
| 699 | |
| 700 | static ssize_t config_test_fs_store(struct device *dev, |
| 701 | struct device_attribute *attr, |
| 702 | const char *buf, size_t count) |
| 703 | { |
| 704 | struct kmod_test_device *test_dev = dev_to_test_dev(dev); |
| 705 | struct test_config *config = &test_dev->config; |
| 706 | int copied; |
| 707 | |
| 708 | mutex_lock(&test_dev->config_mutex); |
| 709 | |
| 710 | kfree_const(config->test_fs); |
| 711 | config->test_fs = NULL; |
| 712 | |
| 713 | copied = config_copy_test_fs(config, buf, count); |
| 714 | mutex_unlock(&test_dev->config_mutex); |
| 715 | |
| 716 | return copied; |
| 717 | } |
| 718 | |
| 719 | static ssize_t config_test_fs_show(struct device *dev, |
| 720 | struct device_attribute *attr, |
| 721 | char *buf) |
| 722 | { |
| 723 | struct kmod_test_device *test_dev = dev_to_test_dev(dev); |
| 724 | struct test_config *config = &test_dev->config; |
| 725 | |
| 726 | return config_test_show_str(&test_dev->config_mutex, buf, |
| 727 | config->test_fs); |
| 728 | } |
| 729 | static DEVICE_ATTR(config_test_fs, 0644, config_test_fs_show, |
| 730 | config_test_fs_store); |
| 731 | |
| 732 | static int trigger_config_run_type(struct kmod_test_device *test_dev, |
| 733 | enum kmod_test_case test_case, |
| 734 | const char *test_str) |
| 735 | { |
| 736 | int copied = 0; |
| 737 | struct test_config *config = &test_dev->config; |
| 738 | |
| 739 | mutex_lock(&test_dev->config_mutex); |
| 740 | |
| 741 | switch (test_case) { |
| 742 | case TEST_KMOD_DRIVER: |
| 743 | kfree_const(config->test_driver); |
| 744 | config->test_driver = NULL; |
| 745 | copied = config_copy_test_driver_name(config, test_str, |
| 746 | strlen(test_str)); |
| 747 | break; |
| 748 | case TEST_KMOD_FS_TYPE: |
Luis R. Rodriguez | d9c6a72 | 2017-07-14 14:50:08 -0700 | [diff] [blame] | 749 | kfree_const(config->test_fs); |
| 750 | config->test_driver = NULL; |
| 751 | copied = config_copy_test_fs(config, test_str, |
| 752 | strlen(test_str)); |
Dan Carpenter | 4e98ebe | 2017-08-10 15:23:50 -0700 | [diff] [blame] | 753 | break; |
Luis R. Rodriguez | d9c6a72 | 2017-07-14 14:50:08 -0700 | [diff] [blame] | 754 | default: |
| 755 | mutex_unlock(&test_dev->config_mutex); |
| 756 | return -EINVAL; |
| 757 | } |
| 758 | |
| 759 | config->test_case = test_case; |
| 760 | |
| 761 | mutex_unlock(&test_dev->config_mutex); |
| 762 | |
| 763 | if (copied <= 0 || copied != strlen(test_str)) { |
| 764 | test_dev->test_is_oom = true; |
| 765 | return -ENOMEM; |
| 766 | } |
| 767 | |
| 768 | test_dev->test_is_oom = false; |
| 769 | |
| 770 | return trigger_config_run(test_dev); |
| 771 | } |
| 772 | |
| 773 | static void free_test_dev_info(struct kmod_test_device *test_dev) |
| 774 | { |
| 775 | vfree(test_dev->info); |
| 776 | test_dev->info = NULL; |
| 777 | } |
| 778 | |
| 779 | static int kmod_config_sync_info(struct kmod_test_device *test_dev) |
| 780 | { |
| 781 | struct test_config *config = &test_dev->config; |
| 782 | |
| 783 | free_test_dev_info(test_dev); |
| 784 | test_dev->info = vzalloc(config->num_threads * |
| 785 | sizeof(struct kmod_test_device_info)); |
Markus Elfring | dc2bf000 | 2017-11-17 15:28:00 -0800 | [diff] [blame] | 786 | if (!test_dev->info) |
Luis R. Rodriguez | d9c6a72 | 2017-07-14 14:50:08 -0700 | [diff] [blame] | 787 | return -ENOMEM; |
Luis R. Rodriguez | d9c6a72 | 2017-07-14 14:50:08 -0700 | [diff] [blame] | 788 | |
| 789 | return 0; |
| 790 | } |
| 791 | |
| 792 | /* |
| 793 | * Old kernels may not have this, if you want to port this code to |
| 794 | * test it on older kernels. |
| 795 | */ |
| 796 | #ifdef get_kmod_umh_limit |
| 797 | static unsigned int kmod_init_test_thread_limit(void) |
| 798 | { |
| 799 | return get_kmod_umh_limit(); |
| 800 | } |
| 801 | #else |
| 802 | static unsigned int kmod_init_test_thread_limit(void) |
| 803 | { |
| 804 | return TEST_START_NUM_THREADS; |
| 805 | } |
| 806 | #endif |
| 807 | |
| 808 | static int __kmod_config_init(struct kmod_test_device *test_dev) |
| 809 | { |
| 810 | struct test_config *config = &test_dev->config; |
| 811 | int ret = -ENOMEM, copied; |
| 812 | |
| 813 | __kmod_config_free(config); |
| 814 | |
| 815 | copied = config_copy_test_driver_name(config, TEST_START_DRIVER, |
| 816 | strlen(TEST_START_DRIVER)); |
| 817 | if (copied != strlen(TEST_START_DRIVER)) |
| 818 | goto err_out; |
| 819 | |
| 820 | copied = config_copy_test_fs(config, TEST_START_TEST_FS, |
| 821 | strlen(TEST_START_TEST_FS)); |
| 822 | if (copied != strlen(TEST_START_TEST_FS)) |
| 823 | goto err_out; |
| 824 | |
| 825 | config->num_threads = kmod_init_test_thread_limit(); |
| 826 | config->test_result = 0; |
| 827 | config->test_case = TEST_START_TEST_CASE; |
| 828 | |
| 829 | ret = kmod_config_sync_info(test_dev); |
| 830 | if (ret) |
| 831 | goto err_out; |
| 832 | |
| 833 | test_dev->test_is_oom = false; |
| 834 | |
| 835 | return 0; |
| 836 | |
| 837 | err_out: |
| 838 | test_dev->test_is_oom = true; |
| 839 | WARN_ON(test_dev->test_is_oom); |
| 840 | |
| 841 | __kmod_config_free(config); |
| 842 | |
| 843 | return ret; |
| 844 | } |
| 845 | |
| 846 | static ssize_t reset_store(struct device *dev, |
| 847 | struct device_attribute *attr, |
| 848 | const char *buf, size_t count) |
| 849 | { |
| 850 | struct kmod_test_device *test_dev = dev_to_test_dev(dev); |
| 851 | int ret; |
| 852 | |
| 853 | mutex_lock(&test_dev->trigger_mutex); |
| 854 | mutex_lock(&test_dev->config_mutex); |
| 855 | |
| 856 | ret = __kmod_config_init(test_dev); |
| 857 | if (ret < 0) { |
| 858 | ret = -ENOMEM; |
| 859 | dev_err(dev, "could not alloc settings for config trigger: %d\n", |
| 860 | ret); |
| 861 | goto out; |
| 862 | } |
| 863 | |
| 864 | dev_info(dev, "reset\n"); |
| 865 | ret = count; |
| 866 | |
| 867 | out: |
| 868 | mutex_unlock(&test_dev->config_mutex); |
| 869 | mutex_unlock(&test_dev->trigger_mutex); |
| 870 | |
| 871 | return ret; |
| 872 | } |
| 873 | static DEVICE_ATTR_WO(reset); |
| 874 | |
| 875 | static int test_dev_config_update_uint_sync(struct kmod_test_device *test_dev, |
| 876 | const char *buf, size_t size, |
| 877 | unsigned int *config, |
| 878 | int (*test_sync)(struct kmod_test_device *test_dev)) |
| 879 | { |
| 880 | int ret; |
Luis R. Rodriguez | 434b06a | 2017-08-10 15:23:44 -0700 | [diff] [blame] | 881 | unsigned long new; |
Luis R. Rodriguez | d9c6a72 | 2017-07-14 14:50:08 -0700 | [diff] [blame] | 882 | unsigned int old_val; |
| 883 | |
Luis R. Rodriguez | 434b06a | 2017-08-10 15:23:44 -0700 | [diff] [blame] | 884 | ret = kstrtoul(buf, 10, &new); |
Luis R. Rodriguez | d9c6a72 | 2017-07-14 14:50:08 -0700 | [diff] [blame] | 885 | if (ret) |
| 886 | return ret; |
| 887 | |
| 888 | if (new > UINT_MAX) |
| 889 | return -EINVAL; |
| 890 | |
| 891 | mutex_lock(&test_dev->config_mutex); |
| 892 | |
| 893 | old_val = *config; |
| 894 | *(unsigned int *)config = new; |
| 895 | |
| 896 | ret = test_sync(test_dev); |
| 897 | if (ret) { |
| 898 | *(unsigned int *)config = old_val; |
| 899 | |
| 900 | ret = test_sync(test_dev); |
| 901 | WARN_ON(ret); |
| 902 | |
| 903 | mutex_unlock(&test_dev->config_mutex); |
| 904 | return -EINVAL; |
| 905 | } |
| 906 | |
| 907 | mutex_unlock(&test_dev->config_mutex); |
| 908 | /* Always return full write size even if we didn't consume all */ |
| 909 | return size; |
| 910 | } |
| 911 | |
| 912 | static int test_dev_config_update_uint_range(struct kmod_test_device *test_dev, |
| 913 | const char *buf, size_t size, |
| 914 | unsigned int *config, |
| 915 | unsigned int min, |
| 916 | unsigned int max) |
| 917 | { |
| 918 | int ret; |
Luis R. Rodriguez | 434b06a | 2017-08-10 15:23:44 -0700 | [diff] [blame] | 919 | unsigned long new; |
Luis R. Rodriguez | d9c6a72 | 2017-07-14 14:50:08 -0700 | [diff] [blame] | 920 | |
Luis R. Rodriguez | 434b06a | 2017-08-10 15:23:44 -0700 | [diff] [blame] | 921 | ret = kstrtoul(buf, 10, &new); |
Luis R. Rodriguez | d9c6a72 | 2017-07-14 14:50:08 -0700 | [diff] [blame] | 922 | if (ret) |
| 923 | return ret; |
| 924 | |
Dan Carpenter | f520409 | 2017-09-08 16:16:53 -0700 | [diff] [blame] | 925 | if (new < min || new > max) |
Luis R. Rodriguez | d9c6a72 | 2017-07-14 14:50:08 -0700 | [diff] [blame] | 926 | return -EINVAL; |
| 927 | |
| 928 | mutex_lock(&test_dev->config_mutex); |
| 929 | *config = new; |
| 930 | mutex_unlock(&test_dev->config_mutex); |
| 931 | |
| 932 | /* Always return full write size even if we didn't consume all */ |
| 933 | return size; |
| 934 | } |
| 935 | |
| 936 | static int test_dev_config_update_int(struct kmod_test_device *test_dev, |
| 937 | const char *buf, size_t size, |
| 938 | int *config) |
| 939 | { |
| 940 | int ret; |
| 941 | long new; |
| 942 | |
| 943 | ret = kstrtol(buf, 10, &new); |
| 944 | if (ret) |
| 945 | return ret; |
| 946 | |
Dan Carpenter | 52c270d | 2017-09-08 16:16:57 -0700 | [diff] [blame] | 947 | if (new < INT_MIN || new > INT_MAX) |
Luis R. Rodriguez | d9c6a72 | 2017-07-14 14:50:08 -0700 | [diff] [blame] | 948 | return -EINVAL; |
| 949 | |
| 950 | mutex_lock(&test_dev->config_mutex); |
| 951 | *config = new; |
| 952 | mutex_unlock(&test_dev->config_mutex); |
| 953 | /* Always return full write size even if we didn't consume all */ |
| 954 | return size; |
| 955 | } |
| 956 | |
| 957 | static ssize_t test_dev_config_show_int(struct kmod_test_device *test_dev, |
| 958 | char *buf, |
| 959 | int config) |
| 960 | { |
| 961 | int val; |
| 962 | |
| 963 | mutex_lock(&test_dev->config_mutex); |
| 964 | val = config; |
| 965 | mutex_unlock(&test_dev->config_mutex); |
| 966 | |
| 967 | return snprintf(buf, PAGE_SIZE, "%d\n", val); |
| 968 | } |
| 969 | |
| 970 | static ssize_t test_dev_config_show_uint(struct kmod_test_device *test_dev, |
| 971 | char *buf, |
| 972 | unsigned int config) |
| 973 | { |
| 974 | unsigned int val; |
| 975 | |
| 976 | mutex_lock(&test_dev->config_mutex); |
| 977 | val = config; |
| 978 | mutex_unlock(&test_dev->config_mutex); |
| 979 | |
| 980 | return snprintf(buf, PAGE_SIZE, "%u\n", val); |
| 981 | } |
| 982 | |
| 983 | static ssize_t test_result_store(struct device *dev, |
| 984 | struct device_attribute *attr, |
| 985 | const char *buf, size_t count) |
| 986 | { |
| 987 | struct kmod_test_device *test_dev = dev_to_test_dev(dev); |
| 988 | struct test_config *config = &test_dev->config; |
| 989 | |
| 990 | return test_dev_config_update_int(test_dev, buf, count, |
| 991 | &config->test_result); |
| 992 | } |
| 993 | |
| 994 | static ssize_t config_num_threads_store(struct device *dev, |
| 995 | struct device_attribute *attr, |
| 996 | const char *buf, size_t count) |
| 997 | { |
| 998 | struct kmod_test_device *test_dev = dev_to_test_dev(dev); |
| 999 | struct test_config *config = &test_dev->config; |
| 1000 | |
| 1001 | return test_dev_config_update_uint_sync(test_dev, buf, count, |
| 1002 | &config->num_threads, |
| 1003 | kmod_config_sync_info); |
| 1004 | } |
| 1005 | |
| 1006 | static ssize_t config_num_threads_show(struct device *dev, |
| 1007 | struct device_attribute *attr, |
| 1008 | char *buf) |
| 1009 | { |
| 1010 | struct kmod_test_device *test_dev = dev_to_test_dev(dev); |
| 1011 | struct test_config *config = &test_dev->config; |
| 1012 | |
| 1013 | return test_dev_config_show_int(test_dev, buf, config->num_threads); |
| 1014 | } |
| 1015 | static DEVICE_ATTR(config_num_threads, 0644, config_num_threads_show, |
| 1016 | config_num_threads_store); |
| 1017 | |
| 1018 | static ssize_t config_test_case_store(struct device *dev, |
| 1019 | struct device_attribute *attr, |
| 1020 | const char *buf, size_t count) |
| 1021 | { |
| 1022 | struct kmod_test_device *test_dev = dev_to_test_dev(dev); |
| 1023 | struct test_config *config = &test_dev->config; |
| 1024 | |
| 1025 | return test_dev_config_update_uint_range(test_dev, buf, count, |
| 1026 | &config->test_case, |
| 1027 | __TEST_KMOD_INVALID + 1, |
| 1028 | __TEST_KMOD_MAX - 1); |
| 1029 | } |
| 1030 | |
| 1031 | static ssize_t config_test_case_show(struct device *dev, |
| 1032 | struct device_attribute *attr, |
| 1033 | char *buf) |
| 1034 | { |
| 1035 | struct kmod_test_device *test_dev = dev_to_test_dev(dev); |
| 1036 | struct test_config *config = &test_dev->config; |
| 1037 | |
| 1038 | return test_dev_config_show_uint(test_dev, buf, config->test_case); |
| 1039 | } |
| 1040 | static DEVICE_ATTR(config_test_case, 0644, config_test_case_show, |
| 1041 | config_test_case_store); |
| 1042 | |
| 1043 | static ssize_t test_result_show(struct device *dev, |
| 1044 | struct device_attribute *attr, |
| 1045 | char *buf) |
| 1046 | { |
| 1047 | struct kmod_test_device *test_dev = dev_to_test_dev(dev); |
| 1048 | struct test_config *config = &test_dev->config; |
| 1049 | |
| 1050 | return test_dev_config_show_int(test_dev, buf, config->test_result); |
| 1051 | } |
| 1052 | static DEVICE_ATTR(test_result, 0644, test_result_show, test_result_store); |
| 1053 | |
| 1054 | #define TEST_KMOD_DEV_ATTR(name) &dev_attr_##name.attr |
| 1055 | |
| 1056 | static struct attribute *test_dev_attrs[] = { |
| 1057 | TEST_KMOD_DEV_ATTR(trigger_config), |
| 1058 | TEST_KMOD_DEV_ATTR(config), |
| 1059 | TEST_KMOD_DEV_ATTR(reset), |
| 1060 | |
| 1061 | TEST_KMOD_DEV_ATTR(config_test_driver), |
| 1062 | TEST_KMOD_DEV_ATTR(config_test_fs), |
| 1063 | TEST_KMOD_DEV_ATTR(config_num_threads), |
| 1064 | TEST_KMOD_DEV_ATTR(config_test_case), |
| 1065 | TEST_KMOD_DEV_ATTR(test_result), |
| 1066 | |
| 1067 | NULL, |
| 1068 | }; |
| 1069 | |
| 1070 | ATTRIBUTE_GROUPS(test_dev); |
| 1071 | |
| 1072 | static int kmod_config_init(struct kmod_test_device *test_dev) |
| 1073 | { |
| 1074 | int ret; |
| 1075 | |
| 1076 | mutex_lock(&test_dev->config_mutex); |
| 1077 | ret = __kmod_config_init(test_dev); |
| 1078 | mutex_unlock(&test_dev->config_mutex); |
| 1079 | |
| 1080 | return ret; |
| 1081 | } |
| 1082 | |
| 1083 | static struct kmod_test_device *alloc_test_dev_kmod(int idx) |
| 1084 | { |
| 1085 | int ret; |
| 1086 | struct kmod_test_device *test_dev; |
| 1087 | struct miscdevice *misc_dev; |
| 1088 | |
| 1089 | test_dev = vzalloc(sizeof(struct kmod_test_device)); |
Markus Elfring | dc2bf000 | 2017-11-17 15:28:00 -0800 | [diff] [blame] | 1090 | if (!test_dev) |
Luis R. Rodriguez | d9c6a72 | 2017-07-14 14:50:08 -0700 | [diff] [blame] | 1091 | goto err_out; |
Luis R. Rodriguez | d9c6a72 | 2017-07-14 14:50:08 -0700 | [diff] [blame] | 1092 | |
| 1093 | mutex_init(&test_dev->config_mutex); |
| 1094 | mutex_init(&test_dev->trigger_mutex); |
| 1095 | mutex_init(&test_dev->thread_mutex); |
| 1096 | |
| 1097 | init_completion(&test_dev->kthreads_done); |
| 1098 | |
| 1099 | ret = kmod_config_init(test_dev); |
| 1100 | if (ret < 0) { |
| 1101 | pr_err("Cannot alloc kmod_config_init()\n"); |
| 1102 | goto err_out_free; |
| 1103 | } |
| 1104 | |
| 1105 | test_dev->dev_idx = idx; |
| 1106 | misc_dev = &test_dev->misc_dev; |
| 1107 | |
| 1108 | misc_dev->minor = MISC_DYNAMIC_MINOR; |
| 1109 | misc_dev->name = kasprintf(GFP_KERNEL, "test_kmod%d", idx); |
| 1110 | if (!misc_dev->name) { |
| 1111 | pr_err("Cannot alloc misc_dev->name\n"); |
| 1112 | goto err_out_free_config; |
| 1113 | } |
| 1114 | misc_dev->groups = test_dev_groups; |
| 1115 | |
| 1116 | return test_dev; |
| 1117 | |
| 1118 | err_out_free_config: |
| 1119 | free_test_dev_info(test_dev); |
| 1120 | kmod_config_free(test_dev); |
| 1121 | err_out_free: |
| 1122 | vfree(test_dev); |
| 1123 | test_dev = NULL; |
| 1124 | err_out: |
| 1125 | return NULL; |
| 1126 | } |
| 1127 | |
| 1128 | static void free_test_dev_kmod(struct kmod_test_device *test_dev) |
| 1129 | { |
| 1130 | if (test_dev) { |
| 1131 | kfree_const(test_dev->misc_dev.name); |
| 1132 | test_dev->misc_dev.name = NULL; |
| 1133 | free_test_dev_info(test_dev); |
| 1134 | kmod_config_free(test_dev); |
| 1135 | vfree(test_dev); |
| 1136 | test_dev = NULL; |
| 1137 | } |
| 1138 | } |
| 1139 | |
| 1140 | static struct kmod_test_device *register_test_dev_kmod(void) |
| 1141 | { |
| 1142 | struct kmod_test_device *test_dev = NULL; |
| 1143 | int ret; |
| 1144 | |
Dan Carpenter | 9c56771 | 2017-08-10 15:23:47 -0700 | [diff] [blame] | 1145 | mutex_lock(®_dev_mutex); |
Luis R. Rodriguez | d9c6a72 | 2017-07-14 14:50:08 -0700 | [diff] [blame] | 1146 | |
| 1147 | /* int should suffice for number of devices, test for wrap */ |
| 1148 | if (unlikely(num_test_devs + 1) < 0) { |
| 1149 | pr_err("reached limit of number of test devices\n"); |
| 1150 | goto out; |
| 1151 | } |
| 1152 | |
| 1153 | test_dev = alloc_test_dev_kmod(num_test_devs); |
| 1154 | if (!test_dev) |
| 1155 | goto out; |
| 1156 | |
| 1157 | ret = misc_register(&test_dev->misc_dev); |
| 1158 | if (ret) { |
| 1159 | pr_err("could not register misc device: %d\n", ret); |
| 1160 | free_test_dev_kmod(test_dev); |
| 1161 | goto out; |
| 1162 | } |
| 1163 | |
| 1164 | test_dev->dev = test_dev->misc_dev.this_device; |
| 1165 | list_add_tail(&test_dev->list, ®_test_devs); |
| 1166 | dev_info(test_dev->dev, "interface ready\n"); |
| 1167 | |
| 1168 | num_test_devs++; |
| 1169 | |
| 1170 | out: |
| 1171 | mutex_unlock(®_dev_mutex); |
| 1172 | |
| 1173 | return test_dev; |
| 1174 | |
| 1175 | } |
| 1176 | |
| 1177 | static int __init test_kmod_init(void) |
| 1178 | { |
| 1179 | struct kmod_test_device *test_dev; |
| 1180 | int ret; |
| 1181 | |
| 1182 | test_dev = register_test_dev_kmod(); |
| 1183 | if (!test_dev) { |
| 1184 | pr_err("Cannot add first test kmod device\n"); |
| 1185 | return -ENODEV; |
| 1186 | } |
| 1187 | |
| 1188 | /* |
| 1189 | * With some work we might be able to gracefully enable |
| 1190 | * testing with this driver built-in, for now this seems |
| 1191 | * rather risky. For those willing to try have at it, |
| 1192 | * and enable the below. Good luck! If that works, try |
| 1193 | * lowering the init level for more fun. |
| 1194 | */ |
| 1195 | if (force_init_test) { |
| 1196 | ret = trigger_config_run_type(test_dev, |
| 1197 | TEST_KMOD_DRIVER, "tun"); |
| 1198 | if (WARN_ON(ret)) |
| 1199 | return ret; |
| 1200 | ret = trigger_config_run_type(test_dev, |
| 1201 | TEST_KMOD_FS_TYPE, "btrfs"); |
| 1202 | if (WARN_ON(ret)) |
| 1203 | return ret; |
| 1204 | } |
| 1205 | |
| 1206 | return 0; |
| 1207 | } |
| 1208 | late_initcall(test_kmod_init); |
| 1209 | |
| 1210 | static |
| 1211 | void unregister_test_dev_kmod(struct kmod_test_device *test_dev) |
| 1212 | { |
| 1213 | mutex_lock(&test_dev->trigger_mutex); |
| 1214 | mutex_lock(&test_dev->config_mutex); |
| 1215 | |
| 1216 | test_dev_kmod_stop_tests(test_dev); |
| 1217 | |
| 1218 | dev_info(test_dev->dev, "removing interface\n"); |
| 1219 | misc_deregister(&test_dev->misc_dev); |
| 1220 | kfree(&test_dev->misc_dev.name); |
| 1221 | |
| 1222 | mutex_unlock(&test_dev->config_mutex); |
| 1223 | mutex_unlock(&test_dev->trigger_mutex); |
| 1224 | |
| 1225 | free_test_dev_kmod(test_dev); |
| 1226 | } |
| 1227 | |
| 1228 | static void __exit test_kmod_exit(void) |
| 1229 | { |
| 1230 | struct kmod_test_device *test_dev, *tmp; |
| 1231 | |
| 1232 | mutex_lock(®_dev_mutex); |
| 1233 | list_for_each_entry_safe(test_dev, tmp, ®_test_devs, list) { |
| 1234 | list_del(&test_dev->list); |
| 1235 | unregister_test_dev_kmod(test_dev); |
| 1236 | } |
| 1237 | mutex_unlock(®_dev_mutex); |
| 1238 | } |
| 1239 | module_exit(test_kmod_exit); |
| 1240 | |
| 1241 | MODULE_AUTHOR("Luis R. Rodriguez <mcgrof@kernel.org>"); |
| 1242 | MODULE_LICENSE("GPL"); |