Luis Chamberlain | 6cad1ec | 2022-10-03 09:58:49 -0700 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0-or-later OR copyleft-next-0.3.1 |
Luis R. Rodriguez | d9c6a72 | 2017-07-14 14:50:08 -0700 | [diff] [blame] | 2 | /* |
| 3 | * kmod stress test driver |
| 4 | * |
| 5 | * Copyright (C) 2017 Luis R. Rodriguez <mcgrof@kernel.org> |
Luis R. Rodriguez | d9c6a72 | 2017-07-14 14:50:08 -0700 | [diff] [blame] | 6 | */ |
| 7 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| 8 | |
| 9 | /* |
| 10 | * This driver provides an interface to trigger and test the kernel's |
| 11 | * module loader through a series of configurations and a few triggers. |
| 12 | * To test this driver use the following script as root: |
| 13 | * |
| 14 | * tools/testing/selftests/kmod/kmod.sh --help |
| 15 | */ |
| 16 | |
| 17 | #include <linux/kernel.h> |
| 18 | #include <linux/module.h> |
| 19 | #include <linux/kmod.h> |
| 20 | #include <linux/printk.h> |
| 21 | #include <linux/kthread.h> |
| 22 | #include <linux/sched.h> |
| 23 | #include <linux/fs.h> |
| 24 | #include <linux/miscdevice.h> |
| 25 | #include <linux/vmalloc.h> |
| 26 | #include <linux/slab.h> |
| 27 | #include <linux/device.h> |
| 28 | |
| 29 | #define TEST_START_NUM_THREADS 50 |
| 30 | #define TEST_START_DRIVER "test_module" |
| 31 | #define TEST_START_TEST_FS "xfs" |
| 32 | #define TEST_START_TEST_CASE TEST_KMOD_DRIVER |
| 33 | |
| 34 | |
| 35 | static bool force_init_test = false; |
| 36 | module_param(force_init_test, bool_enable_only, 0644); |
| 37 | MODULE_PARM_DESC(force_init_test, |
| 38 | "Force kicking a test immediately after driver loads"); |
| 39 | |
| 40 | /* |
| 41 | * For device allocation / registration |
| 42 | */ |
| 43 | static DEFINE_MUTEX(reg_dev_mutex); |
| 44 | static LIST_HEAD(reg_test_devs); |
| 45 | |
| 46 | /* |
| 47 | * num_test_devs actually represents the *next* ID of the next |
| 48 | * device we will allow to create. |
| 49 | */ |
| 50 | static int num_test_devs; |
| 51 | |
| 52 | /** |
| 53 | * enum kmod_test_case - linker table test case |
Luis R. Rodriguez | d9c6a72 | 2017-07-14 14:50:08 -0700 | [diff] [blame] | 54 | * @TEST_KMOD_DRIVER: stress tests request_module() |
| 55 | * @TEST_KMOD_FS_TYPE: stress tests get_fs_type() |
Randy Dunlap | c093a74 | 2023-01-02 13:16:05 -0800 | [diff] [blame] | 56 | * |
| 57 | * If you add a test case, please be sure to review if you need to set |
| 58 | * @need_mod_put for your tests case. |
Luis R. Rodriguez | d9c6a72 | 2017-07-14 14:50:08 -0700 | [diff] [blame] | 59 | */ |
| 60 | enum kmod_test_case { |
| 61 | __TEST_KMOD_INVALID = 0, |
| 62 | |
| 63 | TEST_KMOD_DRIVER, |
| 64 | TEST_KMOD_FS_TYPE, |
| 65 | |
| 66 | __TEST_KMOD_MAX, |
| 67 | }; |
| 68 | |
| 69 | struct test_config { |
| 70 | char *test_driver; |
| 71 | char *test_fs; |
| 72 | unsigned int num_threads; |
| 73 | enum kmod_test_case test_case; |
| 74 | int test_result; |
| 75 | }; |
| 76 | |
| 77 | struct kmod_test_device; |
| 78 | |
| 79 | /** |
Randy Dunlap | c093a74 | 2023-01-02 13:16:05 -0800 | [diff] [blame] | 80 | * struct kmod_test_device_info - thread info |
Luis R. Rodriguez | d9c6a72 | 2017-07-14 14:50:08 -0700 | [diff] [blame] | 81 | * |
| 82 | * @ret_sync: return value if request_module() is used, sync request for |
| 83 | * @TEST_KMOD_DRIVER |
| 84 | * @fs_sync: return value of get_fs_type() for @TEST_KMOD_FS_TYPE |
| 85 | * @thread_idx: thread ID |
| 86 | * @test_dev: test device test is being performed under |
| 87 | * @need_mod_put: Some tests (get_fs_type() is one) requires putting the module |
| 88 | * (module_put(fs_sync->owner)) when done, otherwise you will not be able |
| 89 | * to unload the respective modules and re-test. We use this to keep |
| 90 | * accounting of when we need this and to help out in case we need to |
| 91 | * error out and deal with module_put() on error. |
| 92 | */ |
| 93 | struct kmod_test_device_info { |
| 94 | int ret_sync; |
| 95 | struct file_system_type *fs_sync; |
| 96 | struct task_struct *task_sync; |
| 97 | unsigned int thread_idx; |
| 98 | struct kmod_test_device *test_dev; |
| 99 | bool need_mod_put; |
| 100 | }; |
| 101 | |
| 102 | /** |
Randy Dunlap | c093a74 | 2023-01-02 13:16:05 -0800 | [diff] [blame] | 103 | * struct kmod_test_device - test device to help test kmod |
Luis R. Rodriguez | d9c6a72 | 2017-07-14 14:50:08 -0700 | [diff] [blame] | 104 | * |
| 105 | * @dev_idx: unique ID for test device |
| 106 | * @config: configuration for the test |
| 107 | * @misc_dev: we use a misc device under the hood |
| 108 | * @dev: pointer to misc_dev's own struct device |
| 109 | * @config_mutex: protects configuration of test |
| 110 | * @trigger_mutex: the test trigger can only be fired once at a time |
| 111 | * @thread_lock: protects @done count, and the @info per each thread |
| 112 | * @done: number of threads which have completed or failed |
| 113 | * @test_is_oom: when we run out of memory, use this to halt moving forward |
| 114 | * @kthreads_done: completion used to signal when all work is done |
| 115 | * @list: needed to be part of the reg_test_devs |
| 116 | * @info: array of info for each thread |
| 117 | */ |
| 118 | struct kmod_test_device { |
| 119 | int dev_idx; |
| 120 | struct test_config config; |
| 121 | struct miscdevice misc_dev; |
| 122 | struct device *dev; |
| 123 | struct mutex config_mutex; |
| 124 | struct mutex trigger_mutex; |
| 125 | struct mutex thread_mutex; |
| 126 | |
| 127 | unsigned int done; |
| 128 | |
| 129 | bool test_is_oom; |
| 130 | struct completion kthreads_done; |
| 131 | struct list_head list; |
| 132 | |
| 133 | struct kmod_test_device_info *info; |
| 134 | }; |
| 135 | |
| 136 | static const char *test_case_str(enum kmod_test_case test_case) |
| 137 | { |
| 138 | switch (test_case) { |
| 139 | case TEST_KMOD_DRIVER: |
| 140 | return "TEST_KMOD_DRIVER"; |
| 141 | case TEST_KMOD_FS_TYPE: |
| 142 | return "TEST_KMOD_FS_TYPE"; |
| 143 | default: |
| 144 | return "invalid"; |
| 145 | } |
| 146 | } |
| 147 | |
| 148 | static struct miscdevice *dev_to_misc_dev(struct device *dev) |
| 149 | { |
| 150 | return dev_get_drvdata(dev); |
| 151 | } |
| 152 | |
| 153 | static struct kmod_test_device *misc_dev_to_test_dev(struct miscdevice *misc_dev) |
| 154 | { |
| 155 | return container_of(misc_dev, struct kmod_test_device, misc_dev); |
| 156 | } |
| 157 | |
| 158 | static struct kmod_test_device *dev_to_test_dev(struct device *dev) |
| 159 | { |
| 160 | struct miscdevice *misc_dev; |
| 161 | |
| 162 | misc_dev = dev_to_misc_dev(dev); |
| 163 | |
| 164 | return misc_dev_to_test_dev(misc_dev); |
| 165 | } |
| 166 | |
| 167 | /* Must run with thread_mutex held */ |
| 168 | static void kmod_test_done_check(struct kmod_test_device *test_dev, |
| 169 | unsigned int idx) |
| 170 | { |
| 171 | struct test_config *config = &test_dev->config; |
| 172 | |
| 173 | test_dev->done++; |
| 174 | dev_dbg(test_dev->dev, "Done thread count: %u\n", test_dev->done); |
| 175 | |
| 176 | if (test_dev->done == config->num_threads) { |
| 177 | dev_info(test_dev->dev, "Done: %u threads have all run now\n", |
| 178 | test_dev->done); |
| 179 | dev_info(test_dev->dev, "Last thread to run: %u\n", idx); |
| 180 | complete(&test_dev->kthreads_done); |
| 181 | } |
| 182 | } |
| 183 | |
| 184 | static void test_kmod_put_module(struct kmod_test_device_info *info) |
| 185 | { |
| 186 | struct kmod_test_device *test_dev = info->test_dev; |
| 187 | struct test_config *config = &test_dev->config; |
| 188 | |
| 189 | if (!info->need_mod_put) |
| 190 | return; |
| 191 | |
| 192 | switch (config->test_case) { |
| 193 | case TEST_KMOD_DRIVER: |
| 194 | break; |
| 195 | case TEST_KMOD_FS_TYPE: |
Dan Carpenter | 8f0259c | 2020-04-06 20:10:35 -0700 | [diff] [blame] | 196 | if (info->fs_sync && info->fs_sync->owner) |
Luis R. Rodriguez | d9c6a72 | 2017-07-14 14:50:08 -0700 | [diff] [blame] | 197 | module_put(info->fs_sync->owner); |
| 198 | break; |
| 199 | default: |
| 200 | BUG(); |
| 201 | } |
| 202 | |
| 203 | info->need_mod_put = true; |
| 204 | } |
| 205 | |
| 206 | static int run_request(void *data) |
| 207 | { |
| 208 | struct kmod_test_device_info *info = data; |
| 209 | struct kmod_test_device *test_dev = info->test_dev; |
| 210 | struct test_config *config = &test_dev->config; |
| 211 | |
| 212 | switch (config->test_case) { |
| 213 | case TEST_KMOD_DRIVER: |
| 214 | info->ret_sync = request_module("%s", config->test_driver); |
| 215 | break; |
| 216 | case TEST_KMOD_FS_TYPE: |
| 217 | info->fs_sync = get_fs_type(config->test_fs); |
| 218 | info->need_mod_put = true; |
| 219 | break; |
| 220 | default: |
| 221 | /* __trigger_config_run() already checked for test sanity */ |
| 222 | BUG(); |
| 223 | return -EINVAL; |
| 224 | } |
| 225 | |
| 226 | dev_dbg(test_dev->dev, "Ran thread %u\n", info->thread_idx); |
| 227 | |
| 228 | test_kmod_put_module(info); |
| 229 | |
| 230 | mutex_lock(&test_dev->thread_mutex); |
| 231 | info->task_sync = NULL; |
| 232 | kmod_test_done_check(test_dev, info->thread_idx); |
| 233 | mutex_unlock(&test_dev->thread_mutex); |
| 234 | |
| 235 | return 0; |
| 236 | } |
| 237 | |
| 238 | static int tally_work_test(struct kmod_test_device_info *info) |
| 239 | { |
| 240 | struct kmod_test_device *test_dev = info->test_dev; |
| 241 | struct test_config *config = &test_dev->config; |
| 242 | int err_ret = 0; |
| 243 | |
| 244 | switch (config->test_case) { |
| 245 | case TEST_KMOD_DRIVER: |
| 246 | /* |
| 247 | * Only capture errors, if one is found that's |
| 248 | * enough, for now. |
| 249 | */ |
| 250 | if (info->ret_sync != 0) |
| 251 | err_ret = info->ret_sync; |
| 252 | dev_info(test_dev->dev, |
| 253 | "Sync thread %d return status: %d\n", |
| 254 | info->thread_idx, info->ret_sync); |
| 255 | break; |
| 256 | case TEST_KMOD_FS_TYPE: |
| 257 | /* For now we make this simple */ |
| 258 | if (!info->fs_sync) |
| 259 | err_ret = -EINVAL; |
| 260 | dev_info(test_dev->dev, "Sync thread %u fs: %s\n", |
| 261 | info->thread_idx, info->fs_sync ? config->test_fs : |
| 262 | "NULL"); |
| 263 | break; |
| 264 | default: |
| 265 | BUG(); |
| 266 | } |
| 267 | |
| 268 | return err_ret; |
| 269 | } |
| 270 | |
| 271 | /* |
| 272 | * XXX: add result option to display if all errors did not match. |
| 273 | * For now we just keep any error code if one was found. |
| 274 | * |
| 275 | * If this ran it means *all* tasks were created fine and we |
| 276 | * are now just collecting results. |
| 277 | * |
Zhen Lei | 53b0fe3 | 2021-07-07 18:07:28 -0700 | [diff] [blame] | 278 | * Only propagate errors, do not override with a subsequent success case. |
Luis R. Rodriguez | d9c6a72 | 2017-07-14 14:50:08 -0700 | [diff] [blame] | 279 | */ |
| 280 | static void tally_up_work(struct kmod_test_device *test_dev) |
| 281 | { |
| 282 | struct test_config *config = &test_dev->config; |
| 283 | struct kmod_test_device_info *info; |
| 284 | unsigned int idx; |
| 285 | int err_ret = 0; |
| 286 | int ret = 0; |
| 287 | |
| 288 | mutex_lock(&test_dev->thread_mutex); |
| 289 | |
| 290 | dev_info(test_dev->dev, "Results:\n"); |
| 291 | |
| 292 | for (idx=0; idx < config->num_threads; idx++) { |
| 293 | info = &test_dev->info[idx]; |
| 294 | ret = tally_work_test(info); |
| 295 | if (ret) |
| 296 | err_ret = ret; |
| 297 | } |
| 298 | |
| 299 | /* |
| 300 | * Note: request_module() returns 256 for a module not found even |
| 301 | * though modprobe itself returns 1. |
| 302 | */ |
| 303 | config->test_result = err_ret; |
| 304 | |
| 305 | mutex_unlock(&test_dev->thread_mutex); |
| 306 | } |
| 307 | |
| 308 | static int try_one_request(struct kmod_test_device *test_dev, unsigned int idx) |
| 309 | { |
| 310 | struct kmod_test_device_info *info = &test_dev->info[idx]; |
| 311 | int fail_ret = -ENOMEM; |
| 312 | |
| 313 | mutex_lock(&test_dev->thread_mutex); |
| 314 | |
| 315 | info->thread_idx = idx; |
| 316 | info->test_dev = test_dev; |
| 317 | info->task_sync = kthread_run(run_request, info, "%s-%u", |
| 318 | KBUILD_MODNAME, idx); |
| 319 | |
| 320 | if (!info->task_sync || IS_ERR(info->task_sync)) { |
| 321 | test_dev->test_is_oom = true; |
| 322 | dev_err(test_dev->dev, "Setting up thread %u failed\n", idx); |
| 323 | info->task_sync = NULL; |
| 324 | goto err_out; |
| 325 | } else |
| 326 | dev_dbg(test_dev->dev, "Kicked off thread %u\n", idx); |
| 327 | |
| 328 | mutex_unlock(&test_dev->thread_mutex); |
| 329 | |
| 330 | return 0; |
| 331 | |
| 332 | err_out: |
| 333 | info->ret_sync = fail_ret; |
| 334 | mutex_unlock(&test_dev->thread_mutex); |
| 335 | |
| 336 | return fail_ret; |
| 337 | } |
| 338 | |
| 339 | static void test_dev_kmod_stop_tests(struct kmod_test_device *test_dev) |
| 340 | { |
| 341 | struct test_config *config = &test_dev->config; |
| 342 | struct kmod_test_device_info *info; |
| 343 | unsigned int i; |
| 344 | |
| 345 | dev_info(test_dev->dev, "Ending request_module() tests\n"); |
| 346 | |
| 347 | mutex_lock(&test_dev->thread_mutex); |
| 348 | |
| 349 | for (i=0; i < config->num_threads; i++) { |
| 350 | info = &test_dev->info[i]; |
| 351 | if (info->task_sync && !IS_ERR(info->task_sync)) { |
| 352 | dev_info(test_dev->dev, |
| 353 | "Stopping still-running thread %i\n", i); |
| 354 | kthread_stop(info->task_sync); |
| 355 | } |
| 356 | |
| 357 | /* |
| 358 | * info->task_sync is well protected, it can only be |
| 359 | * NULL or a pointer to a struct. If its NULL we either |
| 360 | * never ran, or we did and we completed the work. Completed |
| 361 | * tasks *always* put the module for us. This is a sanity |
| 362 | * check -- just in case. |
| 363 | */ |
| 364 | if (info->task_sync && info->need_mod_put) |
| 365 | test_kmod_put_module(info); |
| 366 | } |
| 367 | |
| 368 | mutex_unlock(&test_dev->thread_mutex); |
| 369 | } |
| 370 | |
| 371 | /* |
| 372 | * Only wait *iff* we did not run into any errors during all of our thread |
| 373 | * set up. If run into any issues we stop threads and just bail out with |
| 374 | * an error to the trigger. This also means we don't need any tally work |
| 375 | * for any threads which fail. |
| 376 | */ |
| 377 | static int try_requests(struct kmod_test_device *test_dev) |
| 378 | { |
| 379 | struct test_config *config = &test_dev->config; |
| 380 | unsigned int idx; |
| 381 | int ret; |
| 382 | bool any_error = false; |
| 383 | |
| 384 | for (idx=0; idx < config->num_threads; idx++) { |
| 385 | if (test_dev->test_is_oom) { |
| 386 | any_error = true; |
| 387 | break; |
| 388 | } |
| 389 | |
| 390 | ret = try_one_request(test_dev, idx); |
| 391 | if (ret) { |
| 392 | any_error = true; |
| 393 | break; |
| 394 | } |
| 395 | } |
| 396 | |
| 397 | if (!any_error) { |
| 398 | test_dev->test_is_oom = false; |
| 399 | dev_info(test_dev->dev, |
| 400 | "No errors were found while initializing threads\n"); |
| 401 | wait_for_completion(&test_dev->kthreads_done); |
| 402 | tally_up_work(test_dev); |
| 403 | } else { |
| 404 | test_dev->test_is_oom = true; |
| 405 | dev_info(test_dev->dev, |
| 406 | "At least one thread failed to start, stop all work\n"); |
| 407 | test_dev_kmod_stop_tests(test_dev); |
| 408 | return -ENOMEM; |
| 409 | } |
| 410 | |
| 411 | return 0; |
| 412 | } |
| 413 | |
| 414 | static int run_test_driver(struct kmod_test_device *test_dev) |
| 415 | { |
| 416 | struct test_config *config = &test_dev->config; |
| 417 | |
| 418 | dev_info(test_dev->dev, "Test case: %s (%u)\n", |
| 419 | test_case_str(config->test_case), |
| 420 | config->test_case); |
| 421 | dev_info(test_dev->dev, "Test driver to load: %s\n", |
| 422 | config->test_driver); |
| 423 | dev_info(test_dev->dev, "Number of threads to run: %u\n", |
| 424 | config->num_threads); |
| 425 | dev_info(test_dev->dev, "Thread IDs will range from 0 - %u\n", |
| 426 | config->num_threads - 1); |
| 427 | |
| 428 | return try_requests(test_dev); |
| 429 | } |
| 430 | |
| 431 | static int run_test_fs_type(struct kmod_test_device *test_dev) |
| 432 | { |
| 433 | struct test_config *config = &test_dev->config; |
| 434 | |
| 435 | dev_info(test_dev->dev, "Test case: %s (%u)\n", |
| 436 | test_case_str(config->test_case), |
| 437 | config->test_case); |
| 438 | dev_info(test_dev->dev, "Test filesystem to load: %s\n", |
| 439 | config->test_fs); |
| 440 | dev_info(test_dev->dev, "Number of threads to run: %u\n", |
| 441 | config->num_threads); |
| 442 | dev_info(test_dev->dev, "Thread IDs will range from 0 - %u\n", |
| 443 | config->num_threads - 1); |
| 444 | |
| 445 | return try_requests(test_dev); |
| 446 | } |
| 447 | |
| 448 | static ssize_t config_show(struct device *dev, |
| 449 | struct device_attribute *attr, |
| 450 | char *buf) |
| 451 | { |
| 452 | struct kmod_test_device *test_dev = dev_to_test_dev(dev); |
| 453 | struct test_config *config = &test_dev->config; |
| 454 | int len = 0; |
| 455 | |
| 456 | mutex_lock(&test_dev->config_mutex); |
| 457 | |
| 458 | len += snprintf(buf, PAGE_SIZE, |
| 459 | "Custom trigger configuration for: %s\n", |
| 460 | dev_name(dev)); |
| 461 | |
| 462 | len += snprintf(buf+len, PAGE_SIZE - len, |
| 463 | "Number of threads:\t%u\n", |
| 464 | config->num_threads); |
| 465 | |
| 466 | len += snprintf(buf+len, PAGE_SIZE - len, |
| 467 | "Test_case:\t%s (%u)\n", |
| 468 | test_case_str(config->test_case), |
| 469 | config->test_case); |
| 470 | |
| 471 | if (config->test_driver) |
| 472 | len += snprintf(buf+len, PAGE_SIZE - len, |
| 473 | "driver:\t%s\n", |
| 474 | config->test_driver); |
| 475 | else |
| 476 | len += snprintf(buf+len, PAGE_SIZE - len, |
Colin Ian King | a4afe8c | 2017-08-10 15:23:40 -0700 | [diff] [blame] | 477 | "driver:\tEMPTY\n"); |
Luis R. Rodriguez | d9c6a72 | 2017-07-14 14:50:08 -0700 | [diff] [blame] | 478 | |
| 479 | if (config->test_fs) |
| 480 | len += snprintf(buf+len, PAGE_SIZE - len, |
| 481 | "fs:\t%s\n", |
| 482 | config->test_fs); |
| 483 | else |
| 484 | len += snprintf(buf+len, PAGE_SIZE - len, |
Colin Ian King | a4afe8c | 2017-08-10 15:23:40 -0700 | [diff] [blame] | 485 | "fs:\tEMPTY\n"); |
Luis R. Rodriguez | d9c6a72 | 2017-07-14 14:50:08 -0700 | [diff] [blame] | 486 | |
| 487 | mutex_unlock(&test_dev->config_mutex); |
| 488 | |
| 489 | return len; |
| 490 | } |
| 491 | static DEVICE_ATTR_RO(config); |
| 492 | |
| 493 | /* |
| 494 | * This ensures we don't allow kicking threads through if our configuration |
| 495 | * is faulty. |
| 496 | */ |
| 497 | static int __trigger_config_run(struct kmod_test_device *test_dev) |
| 498 | { |
| 499 | struct test_config *config = &test_dev->config; |
| 500 | |
| 501 | test_dev->done = 0; |
| 502 | |
| 503 | switch (config->test_case) { |
| 504 | case TEST_KMOD_DRIVER: |
| 505 | return run_test_driver(test_dev); |
| 506 | case TEST_KMOD_FS_TYPE: |
| 507 | return run_test_fs_type(test_dev); |
| 508 | default: |
| 509 | dev_warn(test_dev->dev, |
| 510 | "Invalid test case requested: %u\n", |
| 511 | config->test_case); |
| 512 | return -EINVAL; |
| 513 | } |
| 514 | } |
| 515 | |
| 516 | static int trigger_config_run(struct kmod_test_device *test_dev) |
| 517 | { |
| 518 | struct test_config *config = &test_dev->config; |
| 519 | int ret; |
| 520 | |
| 521 | mutex_lock(&test_dev->trigger_mutex); |
| 522 | mutex_lock(&test_dev->config_mutex); |
| 523 | |
| 524 | ret = __trigger_config_run(test_dev); |
| 525 | if (ret < 0) |
| 526 | goto out; |
| 527 | dev_info(test_dev->dev, "General test result: %d\n", |
| 528 | config->test_result); |
| 529 | |
| 530 | /* |
| 531 | * We must return 0 after a trigger even unless something went |
| 532 | * wrong with the setup of the test. If the test setup went fine |
| 533 | * then userspace must just check the result of config->test_result. |
| 534 | * One issue with relying on the return from a call in the kernel |
Zhen Lei | 53b0fe3 | 2021-07-07 18:07:28 -0700 | [diff] [blame] | 535 | * is if the kernel returns a positive value using this trigger |
Luis R. Rodriguez | d9c6a72 | 2017-07-14 14:50:08 -0700 | [diff] [blame] | 536 | * will not return the value to userspace, it would be lost. |
| 537 | * |
| 538 | * By not relying on capturing the return value of tests we are using |
| 539 | * through the trigger it also us to run tests with set -e and only |
| 540 | * fail when something went wrong with the driver upon trigger |
| 541 | * requests. |
| 542 | */ |
| 543 | ret = 0; |
| 544 | |
| 545 | out: |
| 546 | mutex_unlock(&test_dev->config_mutex); |
| 547 | mutex_unlock(&test_dev->trigger_mutex); |
| 548 | |
| 549 | return ret; |
| 550 | } |
| 551 | |
| 552 | static ssize_t |
| 553 | trigger_config_store(struct device *dev, |
| 554 | struct device_attribute *attr, |
| 555 | const char *buf, size_t count) |
| 556 | { |
| 557 | struct kmod_test_device *test_dev = dev_to_test_dev(dev); |
| 558 | int ret; |
| 559 | |
| 560 | if (test_dev->test_is_oom) |
| 561 | return -ENOMEM; |
| 562 | |
| 563 | /* For all intents and purposes we don't care what userspace |
| 564 | * sent this trigger, we care only that we were triggered. |
| 565 | * We treat the return value only for caputuring issues with |
| 566 | * the test setup. At this point all the test variables should |
| 567 | * have been allocated so typically this should never fail. |
| 568 | */ |
| 569 | ret = trigger_config_run(test_dev); |
| 570 | if (unlikely(ret < 0)) |
| 571 | goto out; |
| 572 | |
| 573 | /* |
| 574 | * Note: any return > 0 will be treated as success |
| 575 | * and the error value will not be available to userspace. |
| 576 | * Do not rely on trying to send to userspace a test value |
Zhen Lei | 53b0fe3 | 2021-07-07 18:07:28 -0700 | [diff] [blame] | 577 | * return value as positive return errors will be lost. |
Luis R. Rodriguez | d9c6a72 | 2017-07-14 14:50:08 -0700 | [diff] [blame] | 578 | */ |
| 579 | if (WARN_ON(ret > 0)) |
| 580 | return -EINVAL; |
| 581 | |
| 582 | ret = count; |
| 583 | out: |
| 584 | return ret; |
| 585 | } |
| 586 | static DEVICE_ATTR_WO(trigger_config); |
| 587 | |
| 588 | /* |
| 589 | * XXX: move to kstrncpy() once merged. |
| 590 | * |
| 591 | * Users should use kfree_const() when freeing these. |
| 592 | */ |
| 593 | static int __kstrncpy(char **dst, const char *name, size_t count, gfp_t gfp) |
| 594 | { |
| 595 | *dst = kstrndup(name, count, gfp); |
| 596 | if (!*dst) |
| 597 | return -ENOSPC; |
| 598 | return count; |
| 599 | } |
| 600 | |
| 601 | static int config_copy_test_driver_name(struct test_config *config, |
| 602 | const char *name, |
| 603 | size_t count) |
| 604 | { |
| 605 | return __kstrncpy(&config->test_driver, name, count, GFP_KERNEL); |
| 606 | } |
| 607 | |
| 608 | |
| 609 | static int config_copy_test_fs(struct test_config *config, const char *name, |
| 610 | size_t count) |
| 611 | { |
| 612 | return __kstrncpy(&config->test_fs, name, count, GFP_KERNEL); |
| 613 | } |
| 614 | |
| 615 | static void __kmod_config_free(struct test_config *config) |
| 616 | { |
| 617 | if (!config) |
| 618 | return; |
| 619 | |
| 620 | kfree_const(config->test_driver); |
| 621 | config->test_driver = NULL; |
| 622 | |
| 623 | kfree_const(config->test_fs); |
Dan Carpenter | db7ddea | 2019-02-01 14:20:58 -0800 | [diff] [blame] | 624 | config->test_fs = NULL; |
Luis R. Rodriguez | d9c6a72 | 2017-07-14 14:50:08 -0700 | [diff] [blame] | 625 | } |
| 626 | |
| 627 | static void kmod_config_free(struct kmod_test_device *test_dev) |
| 628 | { |
| 629 | struct test_config *config; |
| 630 | |
| 631 | if (!test_dev) |
| 632 | return; |
| 633 | |
| 634 | config = &test_dev->config; |
| 635 | |
| 636 | mutex_lock(&test_dev->config_mutex); |
| 637 | __kmod_config_free(config); |
| 638 | mutex_unlock(&test_dev->config_mutex); |
| 639 | } |
| 640 | |
| 641 | static ssize_t config_test_driver_store(struct device *dev, |
| 642 | struct device_attribute *attr, |
| 643 | const char *buf, size_t count) |
| 644 | { |
| 645 | struct kmod_test_device *test_dev = dev_to_test_dev(dev); |
| 646 | struct test_config *config = &test_dev->config; |
| 647 | int copied; |
| 648 | |
| 649 | mutex_lock(&test_dev->config_mutex); |
| 650 | |
| 651 | kfree_const(config->test_driver); |
| 652 | config->test_driver = NULL; |
| 653 | |
| 654 | copied = config_copy_test_driver_name(config, buf, count); |
| 655 | mutex_unlock(&test_dev->config_mutex); |
| 656 | |
| 657 | return copied; |
| 658 | } |
| 659 | |
| 660 | /* |
| 661 | * As per sysfs_kf_seq_show() the buf is max PAGE_SIZE. |
| 662 | */ |
| 663 | static ssize_t config_test_show_str(struct mutex *config_mutex, |
| 664 | char *dst, |
| 665 | char *src) |
| 666 | { |
| 667 | int len; |
| 668 | |
| 669 | mutex_lock(config_mutex); |
| 670 | len = snprintf(dst, PAGE_SIZE, "%s\n", src); |
| 671 | mutex_unlock(config_mutex); |
| 672 | |
| 673 | return len; |
| 674 | } |
| 675 | |
| 676 | static ssize_t config_test_driver_show(struct device *dev, |
| 677 | struct device_attribute *attr, |
| 678 | char *buf) |
| 679 | { |
| 680 | struct kmod_test_device *test_dev = dev_to_test_dev(dev); |
| 681 | struct test_config *config = &test_dev->config; |
| 682 | |
| 683 | return config_test_show_str(&test_dev->config_mutex, buf, |
| 684 | config->test_driver); |
| 685 | } |
Joe Perches | b6b996b | 2017-12-19 10:15:07 -0800 | [diff] [blame] | 686 | static DEVICE_ATTR_RW(config_test_driver); |
Luis R. Rodriguez | d9c6a72 | 2017-07-14 14:50:08 -0700 | [diff] [blame] | 687 | |
| 688 | static ssize_t config_test_fs_store(struct device *dev, |
| 689 | struct device_attribute *attr, |
| 690 | const char *buf, size_t count) |
| 691 | { |
| 692 | struct kmod_test_device *test_dev = dev_to_test_dev(dev); |
| 693 | struct test_config *config = &test_dev->config; |
| 694 | int copied; |
| 695 | |
| 696 | mutex_lock(&test_dev->config_mutex); |
| 697 | |
| 698 | kfree_const(config->test_fs); |
| 699 | config->test_fs = NULL; |
| 700 | |
| 701 | copied = config_copy_test_fs(config, buf, count); |
| 702 | mutex_unlock(&test_dev->config_mutex); |
| 703 | |
| 704 | return copied; |
| 705 | } |
| 706 | |
| 707 | static ssize_t config_test_fs_show(struct device *dev, |
| 708 | struct device_attribute *attr, |
| 709 | char *buf) |
| 710 | { |
| 711 | struct kmod_test_device *test_dev = dev_to_test_dev(dev); |
| 712 | struct test_config *config = &test_dev->config; |
| 713 | |
| 714 | return config_test_show_str(&test_dev->config_mutex, buf, |
| 715 | config->test_fs); |
| 716 | } |
Joe Perches | b6b996b | 2017-12-19 10:15:07 -0800 | [diff] [blame] | 717 | static DEVICE_ATTR_RW(config_test_fs); |
Luis R. Rodriguez | d9c6a72 | 2017-07-14 14:50:08 -0700 | [diff] [blame] | 718 | |
| 719 | static int trigger_config_run_type(struct kmod_test_device *test_dev, |
| 720 | enum kmod_test_case test_case, |
| 721 | const char *test_str) |
| 722 | { |
| 723 | int copied = 0; |
| 724 | struct test_config *config = &test_dev->config; |
| 725 | |
| 726 | mutex_lock(&test_dev->config_mutex); |
| 727 | |
| 728 | switch (test_case) { |
| 729 | case TEST_KMOD_DRIVER: |
| 730 | kfree_const(config->test_driver); |
| 731 | config->test_driver = NULL; |
| 732 | copied = config_copy_test_driver_name(config, test_str, |
| 733 | strlen(test_str)); |
| 734 | break; |
| 735 | case TEST_KMOD_FS_TYPE: |
Luis R. Rodriguez | d9c6a72 | 2017-07-14 14:50:08 -0700 | [diff] [blame] | 736 | kfree_const(config->test_fs); |
Tiezhu Yang | 0776d12 | 2020-08-11 18:36:16 -0700 | [diff] [blame] | 737 | config->test_fs = NULL; |
Luis R. Rodriguez | d9c6a72 | 2017-07-14 14:50:08 -0700 | [diff] [blame] | 738 | copied = config_copy_test_fs(config, test_str, |
| 739 | strlen(test_str)); |
Dan Carpenter | 4e98ebe | 2017-08-10 15:23:50 -0700 | [diff] [blame] | 740 | break; |
Luis R. Rodriguez | d9c6a72 | 2017-07-14 14:50:08 -0700 | [diff] [blame] | 741 | default: |
| 742 | mutex_unlock(&test_dev->config_mutex); |
| 743 | return -EINVAL; |
| 744 | } |
| 745 | |
| 746 | config->test_case = test_case; |
| 747 | |
| 748 | mutex_unlock(&test_dev->config_mutex); |
| 749 | |
| 750 | if (copied <= 0 || copied != strlen(test_str)) { |
| 751 | test_dev->test_is_oom = true; |
| 752 | return -ENOMEM; |
| 753 | } |
| 754 | |
| 755 | test_dev->test_is_oom = false; |
| 756 | |
| 757 | return trigger_config_run(test_dev); |
| 758 | } |
| 759 | |
| 760 | static void free_test_dev_info(struct kmod_test_device *test_dev) |
| 761 | { |
| 762 | vfree(test_dev->info); |
| 763 | test_dev->info = NULL; |
| 764 | } |
| 765 | |
| 766 | static int kmod_config_sync_info(struct kmod_test_device *test_dev) |
| 767 | { |
| 768 | struct test_config *config = &test_dev->config; |
| 769 | |
| 770 | free_test_dev_info(test_dev); |
Kees Cook | fad953c | 2018-06-12 14:27:37 -0700 | [diff] [blame] | 771 | test_dev->info = |
| 772 | vzalloc(array_size(sizeof(struct kmod_test_device_info), |
| 773 | config->num_threads)); |
Markus Elfring | dc2bf000 | 2017-11-17 15:28:00 -0800 | [diff] [blame] | 774 | if (!test_dev->info) |
Luis R. Rodriguez | d9c6a72 | 2017-07-14 14:50:08 -0700 | [diff] [blame] | 775 | return -ENOMEM; |
Luis R. Rodriguez | d9c6a72 | 2017-07-14 14:50:08 -0700 | [diff] [blame] | 776 | |
| 777 | return 0; |
| 778 | } |
| 779 | |
| 780 | /* |
| 781 | * Old kernels may not have this, if you want to port this code to |
| 782 | * test it on older kernels. |
| 783 | */ |
| 784 | #ifdef get_kmod_umh_limit |
| 785 | static unsigned int kmod_init_test_thread_limit(void) |
| 786 | { |
| 787 | return get_kmod_umh_limit(); |
| 788 | } |
| 789 | #else |
| 790 | static unsigned int kmod_init_test_thread_limit(void) |
| 791 | { |
| 792 | return TEST_START_NUM_THREADS; |
| 793 | } |
| 794 | #endif |
| 795 | |
| 796 | static int __kmod_config_init(struct kmod_test_device *test_dev) |
| 797 | { |
| 798 | struct test_config *config = &test_dev->config; |
| 799 | int ret = -ENOMEM, copied; |
| 800 | |
| 801 | __kmod_config_free(config); |
| 802 | |
| 803 | copied = config_copy_test_driver_name(config, TEST_START_DRIVER, |
| 804 | strlen(TEST_START_DRIVER)); |
| 805 | if (copied != strlen(TEST_START_DRIVER)) |
| 806 | goto err_out; |
| 807 | |
| 808 | copied = config_copy_test_fs(config, TEST_START_TEST_FS, |
| 809 | strlen(TEST_START_TEST_FS)); |
| 810 | if (copied != strlen(TEST_START_TEST_FS)) |
| 811 | goto err_out; |
| 812 | |
| 813 | config->num_threads = kmod_init_test_thread_limit(); |
| 814 | config->test_result = 0; |
| 815 | config->test_case = TEST_START_TEST_CASE; |
| 816 | |
| 817 | ret = kmod_config_sync_info(test_dev); |
| 818 | if (ret) |
| 819 | goto err_out; |
| 820 | |
| 821 | test_dev->test_is_oom = false; |
| 822 | |
| 823 | return 0; |
| 824 | |
| 825 | err_out: |
| 826 | test_dev->test_is_oom = true; |
| 827 | WARN_ON(test_dev->test_is_oom); |
| 828 | |
| 829 | __kmod_config_free(config); |
| 830 | |
| 831 | return ret; |
| 832 | } |
| 833 | |
| 834 | static ssize_t reset_store(struct device *dev, |
| 835 | struct device_attribute *attr, |
| 836 | const char *buf, size_t count) |
| 837 | { |
| 838 | struct kmod_test_device *test_dev = dev_to_test_dev(dev); |
| 839 | int ret; |
| 840 | |
| 841 | mutex_lock(&test_dev->trigger_mutex); |
| 842 | mutex_lock(&test_dev->config_mutex); |
| 843 | |
| 844 | ret = __kmod_config_init(test_dev); |
| 845 | if (ret < 0) { |
| 846 | ret = -ENOMEM; |
| 847 | dev_err(dev, "could not alloc settings for config trigger: %d\n", |
| 848 | ret); |
| 849 | goto out; |
| 850 | } |
| 851 | |
| 852 | dev_info(dev, "reset\n"); |
| 853 | ret = count; |
| 854 | |
| 855 | out: |
| 856 | mutex_unlock(&test_dev->config_mutex); |
| 857 | mutex_unlock(&test_dev->trigger_mutex); |
| 858 | |
| 859 | return ret; |
| 860 | } |
| 861 | static DEVICE_ATTR_WO(reset); |
| 862 | |
| 863 | static int test_dev_config_update_uint_sync(struct kmod_test_device *test_dev, |
| 864 | const char *buf, size_t size, |
| 865 | unsigned int *config, |
| 866 | int (*test_sync)(struct kmod_test_device *test_dev)) |
| 867 | { |
| 868 | int ret; |
Alexey Dobriyan | 506dfc9 | 2020-12-15 20:44:00 -0800 | [diff] [blame] | 869 | unsigned int val; |
Luis R. Rodriguez | d9c6a72 | 2017-07-14 14:50:08 -0700 | [diff] [blame] | 870 | unsigned int old_val; |
| 871 | |
Alexey Dobriyan | 506dfc9 | 2020-12-15 20:44:00 -0800 | [diff] [blame] | 872 | ret = kstrtouint(buf, 10, &val); |
Luis R. Rodriguez | d9c6a72 | 2017-07-14 14:50:08 -0700 | [diff] [blame] | 873 | if (ret) |
| 874 | return ret; |
| 875 | |
Luis R. Rodriguez | d9c6a72 | 2017-07-14 14:50:08 -0700 | [diff] [blame] | 876 | mutex_lock(&test_dev->config_mutex); |
| 877 | |
| 878 | old_val = *config; |
Alexey Dobriyan | 506dfc9 | 2020-12-15 20:44:00 -0800 | [diff] [blame] | 879 | *(unsigned int *)config = val; |
Luis R. Rodriguez | d9c6a72 | 2017-07-14 14:50:08 -0700 | [diff] [blame] | 880 | |
| 881 | ret = test_sync(test_dev); |
| 882 | if (ret) { |
| 883 | *(unsigned int *)config = old_val; |
| 884 | |
| 885 | ret = test_sync(test_dev); |
| 886 | WARN_ON(ret); |
| 887 | |
| 888 | mutex_unlock(&test_dev->config_mutex); |
| 889 | return -EINVAL; |
| 890 | } |
| 891 | |
| 892 | mutex_unlock(&test_dev->config_mutex); |
| 893 | /* Always return full write size even if we didn't consume all */ |
| 894 | return size; |
| 895 | } |
| 896 | |
| 897 | static int test_dev_config_update_uint_range(struct kmod_test_device *test_dev, |
| 898 | const char *buf, size_t size, |
| 899 | unsigned int *config, |
| 900 | unsigned int min, |
| 901 | unsigned int max) |
| 902 | { |
Alexey Dobriyan | 506dfc9 | 2020-12-15 20:44:00 -0800 | [diff] [blame] | 903 | unsigned int val; |
Luis R. Rodriguez | d9c6a72 | 2017-07-14 14:50:08 -0700 | [diff] [blame] | 904 | int ret; |
Luis R. Rodriguez | d9c6a72 | 2017-07-14 14:50:08 -0700 | [diff] [blame] | 905 | |
Alexey Dobriyan | 506dfc9 | 2020-12-15 20:44:00 -0800 | [diff] [blame] | 906 | ret = kstrtouint(buf, 10, &val); |
Luis R. Rodriguez | d9c6a72 | 2017-07-14 14:50:08 -0700 | [diff] [blame] | 907 | if (ret) |
| 908 | return ret; |
| 909 | |
Alexey Dobriyan | 506dfc9 | 2020-12-15 20:44:00 -0800 | [diff] [blame] | 910 | if (val < min || val > max) |
Luis R. Rodriguez | d9c6a72 | 2017-07-14 14:50:08 -0700 | [diff] [blame] | 911 | return -EINVAL; |
| 912 | |
| 913 | mutex_lock(&test_dev->config_mutex); |
Alexey Dobriyan | 506dfc9 | 2020-12-15 20:44:00 -0800 | [diff] [blame] | 914 | *config = val; |
Luis R. Rodriguez | d9c6a72 | 2017-07-14 14:50:08 -0700 | [diff] [blame] | 915 | mutex_unlock(&test_dev->config_mutex); |
| 916 | |
| 917 | /* Always return full write size even if we didn't consume all */ |
| 918 | return size; |
| 919 | } |
| 920 | |
| 921 | static int test_dev_config_update_int(struct kmod_test_device *test_dev, |
| 922 | const char *buf, size_t size, |
| 923 | int *config) |
| 924 | { |
Alexey Dobriyan | 506dfc9 | 2020-12-15 20:44:00 -0800 | [diff] [blame] | 925 | int val; |
Luis R. Rodriguez | d9c6a72 | 2017-07-14 14:50:08 -0700 | [diff] [blame] | 926 | int ret; |
Luis R. Rodriguez | d9c6a72 | 2017-07-14 14:50:08 -0700 | [diff] [blame] | 927 | |
Alexey Dobriyan | 506dfc9 | 2020-12-15 20:44:00 -0800 | [diff] [blame] | 928 | ret = kstrtoint(buf, 10, &val); |
Luis R. Rodriguez | d9c6a72 | 2017-07-14 14:50:08 -0700 | [diff] [blame] | 929 | if (ret) |
| 930 | return ret; |
| 931 | |
Luis R. Rodriguez | d9c6a72 | 2017-07-14 14:50:08 -0700 | [diff] [blame] | 932 | mutex_lock(&test_dev->config_mutex); |
Alexey Dobriyan | 506dfc9 | 2020-12-15 20:44:00 -0800 | [diff] [blame] | 933 | *config = val; |
Luis R. Rodriguez | d9c6a72 | 2017-07-14 14:50:08 -0700 | [diff] [blame] | 934 | mutex_unlock(&test_dev->config_mutex); |
| 935 | /* Always return full write size even if we didn't consume all */ |
| 936 | return size; |
| 937 | } |
| 938 | |
| 939 | static ssize_t test_dev_config_show_int(struct kmod_test_device *test_dev, |
| 940 | char *buf, |
| 941 | int config) |
| 942 | { |
| 943 | int val; |
| 944 | |
| 945 | mutex_lock(&test_dev->config_mutex); |
| 946 | val = config; |
| 947 | mutex_unlock(&test_dev->config_mutex); |
| 948 | |
| 949 | return snprintf(buf, PAGE_SIZE, "%d\n", val); |
| 950 | } |
| 951 | |
| 952 | static ssize_t test_dev_config_show_uint(struct kmod_test_device *test_dev, |
| 953 | char *buf, |
| 954 | unsigned int config) |
| 955 | { |
| 956 | unsigned int val; |
| 957 | |
| 958 | mutex_lock(&test_dev->config_mutex); |
| 959 | val = config; |
| 960 | mutex_unlock(&test_dev->config_mutex); |
| 961 | |
| 962 | return snprintf(buf, PAGE_SIZE, "%u\n", val); |
| 963 | } |
| 964 | |
| 965 | static ssize_t test_result_store(struct device *dev, |
| 966 | struct device_attribute *attr, |
| 967 | const char *buf, size_t count) |
| 968 | { |
| 969 | struct kmod_test_device *test_dev = dev_to_test_dev(dev); |
| 970 | struct test_config *config = &test_dev->config; |
| 971 | |
| 972 | return test_dev_config_update_int(test_dev, buf, count, |
| 973 | &config->test_result); |
| 974 | } |
| 975 | |
| 976 | static ssize_t config_num_threads_store(struct device *dev, |
| 977 | struct device_attribute *attr, |
| 978 | const char *buf, size_t count) |
| 979 | { |
| 980 | struct kmod_test_device *test_dev = dev_to_test_dev(dev); |
| 981 | struct test_config *config = &test_dev->config; |
| 982 | |
| 983 | return test_dev_config_update_uint_sync(test_dev, buf, count, |
| 984 | &config->num_threads, |
| 985 | kmod_config_sync_info); |
| 986 | } |
| 987 | |
| 988 | static ssize_t config_num_threads_show(struct device *dev, |
| 989 | struct device_attribute *attr, |
| 990 | char *buf) |
| 991 | { |
| 992 | struct kmod_test_device *test_dev = dev_to_test_dev(dev); |
| 993 | struct test_config *config = &test_dev->config; |
| 994 | |
| 995 | return test_dev_config_show_int(test_dev, buf, config->num_threads); |
| 996 | } |
Joe Perches | b6b996b | 2017-12-19 10:15:07 -0800 | [diff] [blame] | 997 | static DEVICE_ATTR_RW(config_num_threads); |
Luis R. Rodriguez | d9c6a72 | 2017-07-14 14:50:08 -0700 | [diff] [blame] | 998 | |
| 999 | static ssize_t config_test_case_store(struct device *dev, |
| 1000 | struct device_attribute *attr, |
| 1001 | const char *buf, size_t count) |
| 1002 | { |
| 1003 | struct kmod_test_device *test_dev = dev_to_test_dev(dev); |
| 1004 | struct test_config *config = &test_dev->config; |
| 1005 | |
| 1006 | return test_dev_config_update_uint_range(test_dev, buf, count, |
| 1007 | &config->test_case, |
| 1008 | __TEST_KMOD_INVALID + 1, |
| 1009 | __TEST_KMOD_MAX - 1); |
| 1010 | } |
| 1011 | |
| 1012 | static ssize_t config_test_case_show(struct device *dev, |
| 1013 | struct device_attribute *attr, |
| 1014 | char *buf) |
| 1015 | { |
| 1016 | struct kmod_test_device *test_dev = dev_to_test_dev(dev); |
| 1017 | struct test_config *config = &test_dev->config; |
| 1018 | |
| 1019 | return test_dev_config_show_uint(test_dev, buf, config->test_case); |
| 1020 | } |
Joe Perches | b6b996b | 2017-12-19 10:15:07 -0800 | [diff] [blame] | 1021 | static DEVICE_ATTR_RW(config_test_case); |
Luis R. Rodriguez | d9c6a72 | 2017-07-14 14:50:08 -0700 | [diff] [blame] | 1022 | |
| 1023 | static ssize_t test_result_show(struct device *dev, |
| 1024 | struct device_attribute *attr, |
| 1025 | char *buf) |
| 1026 | { |
| 1027 | struct kmod_test_device *test_dev = dev_to_test_dev(dev); |
| 1028 | struct test_config *config = &test_dev->config; |
| 1029 | |
| 1030 | return test_dev_config_show_int(test_dev, buf, config->test_result); |
| 1031 | } |
Joe Perches | b6b996b | 2017-12-19 10:15:07 -0800 | [diff] [blame] | 1032 | static DEVICE_ATTR_RW(test_result); |
Luis R. Rodriguez | d9c6a72 | 2017-07-14 14:50:08 -0700 | [diff] [blame] | 1033 | |
| 1034 | #define TEST_KMOD_DEV_ATTR(name) &dev_attr_##name.attr |
| 1035 | |
| 1036 | static struct attribute *test_dev_attrs[] = { |
| 1037 | TEST_KMOD_DEV_ATTR(trigger_config), |
| 1038 | TEST_KMOD_DEV_ATTR(config), |
| 1039 | TEST_KMOD_DEV_ATTR(reset), |
| 1040 | |
| 1041 | TEST_KMOD_DEV_ATTR(config_test_driver), |
| 1042 | TEST_KMOD_DEV_ATTR(config_test_fs), |
| 1043 | TEST_KMOD_DEV_ATTR(config_num_threads), |
| 1044 | TEST_KMOD_DEV_ATTR(config_test_case), |
| 1045 | TEST_KMOD_DEV_ATTR(test_result), |
| 1046 | |
| 1047 | NULL, |
| 1048 | }; |
| 1049 | |
| 1050 | ATTRIBUTE_GROUPS(test_dev); |
| 1051 | |
| 1052 | static int kmod_config_init(struct kmod_test_device *test_dev) |
| 1053 | { |
| 1054 | int ret; |
| 1055 | |
| 1056 | mutex_lock(&test_dev->config_mutex); |
| 1057 | ret = __kmod_config_init(test_dev); |
| 1058 | mutex_unlock(&test_dev->config_mutex); |
| 1059 | |
| 1060 | return ret; |
| 1061 | } |
| 1062 | |
| 1063 | static struct kmod_test_device *alloc_test_dev_kmod(int idx) |
| 1064 | { |
| 1065 | int ret; |
| 1066 | struct kmod_test_device *test_dev; |
| 1067 | struct miscdevice *misc_dev; |
| 1068 | |
| 1069 | test_dev = vzalloc(sizeof(struct kmod_test_device)); |
Markus Elfring | dc2bf000 | 2017-11-17 15:28:00 -0800 | [diff] [blame] | 1070 | if (!test_dev) |
Luis R. Rodriguez | d9c6a72 | 2017-07-14 14:50:08 -0700 | [diff] [blame] | 1071 | goto err_out; |
Luis R. Rodriguez | d9c6a72 | 2017-07-14 14:50:08 -0700 | [diff] [blame] | 1072 | |
| 1073 | mutex_init(&test_dev->config_mutex); |
| 1074 | mutex_init(&test_dev->trigger_mutex); |
| 1075 | mutex_init(&test_dev->thread_mutex); |
| 1076 | |
| 1077 | init_completion(&test_dev->kthreads_done); |
| 1078 | |
| 1079 | ret = kmod_config_init(test_dev); |
| 1080 | if (ret < 0) { |
| 1081 | pr_err("Cannot alloc kmod_config_init()\n"); |
| 1082 | goto err_out_free; |
| 1083 | } |
| 1084 | |
| 1085 | test_dev->dev_idx = idx; |
| 1086 | misc_dev = &test_dev->misc_dev; |
| 1087 | |
| 1088 | misc_dev->minor = MISC_DYNAMIC_MINOR; |
| 1089 | misc_dev->name = kasprintf(GFP_KERNEL, "test_kmod%d", idx); |
| 1090 | if (!misc_dev->name) { |
| 1091 | pr_err("Cannot alloc misc_dev->name\n"); |
| 1092 | goto err_out_free_config; |
| 1093 | } |
| 1094 | misc_dev->groups = test_dev_groups; |
| 1095 | |
| 1096 | return test_dev; |
| 1097 | |
| 1098 | err_out_free_config: |
| 1099 | free_test_dev_info(test_dev); |
| 1100 | kmod_config_free(test_dev); |
| 1101 | err_out_free: |
| 1102 | vfree(test_dev); |
| 1103 | test_dev = NULL; |
| 1104 | err_out: |
| 1105 | return NULL; |
| 1106 | } |
| 1107 | |
| 1108 | static void free_test_dev_kmod(struct kmod_test_device *test_dev) |
| 1109 | { |
| 1110 | if (test_dev) { |
| 1111 | kfree_const(test_dev->misc_dev.name); |
| 1112 | test_dev->misc_dev.name = NULL; |
| 1113 | free_test_dev_info(test_dev); |
| 1114 | kmod_config_free(test_dev); |
| 1115 | vfree(test_dev); |
| 1116 | test_dev = NULL; |
| 1117 | } |
| 1118 | } |
| 1119 | |
| 1120 | static struct kmod_test_device *register_test_dev_kmod(void) |
| 1121 | { |
| 1122 | struct kmod_test_device *test_dev = NULL; |
| 1123 | int ret; |
| 1124 | |
Dan Carpenter | 9c56771 | 2017-08-10 15:23:47 -0700 | [diff] [blame] | 1125 | mutex_lock(®_dev_mutex); |
Luis R. Rodriguez | d9c6a72 | 2017-07-14 14:50:08 -0700 | [diff] [blame] | 1126 | |
| 1127 | /* int should suffice for number of devices, test for wrap */ |
Luis R. Rodriguez | ac68b1b | 2018-03-09 15:51:20 -0800 | [diff] [blame] | 1128 | if (num_test_devs + 1 == INT_MAX) { |
Luis R. Rodriguez | d9c6a72 | 2017-07-14 14:50:08 -0700 | [diff] [blame] | 1129 | pr_err("reached limit of number of test devices\n"); |
| 1130 | goto out; |
| 1131 | } |
| 1132 | |
| 1133 | test_dev = alloc_test_dev_kmod(num_test_devs); |
| 1134 | if (!test_dev) |
| 1135 | goto out; |
| 1136 | |
| 1137 | ret = misc_register(&test_dev->misc_dev); |
| 1138 | if (ret) { |
| 1139 | pr_err("could not register misc device: %d\n", ret); |
| 1140 | free_test_dev_kmod(test_dev); |
Dan Carpenter | dc0ce6c | 2022-03-24 08:52:07 +0300 | [diff] [blame] | 1141 | test_dev = NULL; |
Luis R. Rodriguez | d9c6a72 | 2017-07-14 14:50:08 -0700 | [diff] [blame] | 1142 | goto out; |
| 1143 | } |
| 1144 | |
| 1145 | test_dev->dev = test_dev->misc_dev.this_device; |
| 1146 | list_add_tail(&test_dev->list, ®_test_devs); |
| 1147 | dev_info(test_dev->dev, "interface ready\n"); |
| 1148 | |
| 1149 | num_test_devs++; |
| 1150 | |
| 1151 | out: |
| 1152 | mutex_unlock(®_dev_mutex); |
| 1153 | |
| 1154 | return test_dev; |
| 1155 | |
| 1156 | } |
| 1157 | |
| 1158 | static int __init test_kmod_init(void) |
| 1159 | { |
| 1160 | struct kmod_test_device *test_dev; |
| 1161 | int ret; |
| 1162 | |
| 1163 | test_dev = register_test_dev_kmod(); |
| 1164 | if (!test_dev) { |
| 1165 | pr_err("Cannot add first test kmod device\n"); |
| 1166 | return -ENODEV; |
| 1167 | } |
| 1168 | |
| 1169 | /* |
| 1170 | * With some work we might be able to gracefully enable |
| 1171 | * testing with this driver built-in, for now this seems |
| 1172 | * rather risky. For those willing to try have at it, |
| 1173 | * and enable the below. Good luck! If that works, try |
| 1174 | * lowering the init level for more fun. |
| 1175 | */ |
| 1176 | if (force_init_test) { |
| 1177 | ret = trigger_config_run_type(test_dev, |
| 1178 | TEST_KMOD_DRIVER, "tun"); |
| 1179 | if (WARN_ON(ret)) |
| 1180 | return ret; |
| 1181 | ret = trigger_config_run_type(test_dev, |
| 1182 | TEST_KMOD_FS_TYPE, "btrfs"); |
| 1183 | if (WARN_ON(ret)) |
| 1184 | return ret; |
| 1185 | } |
| 1186 | |
| 1187 | return 0; |
| 1188 | } |
| 1189 | late_initcall(test_kmod_init); |
| 1190 | |
| 1191 | static |
| 1192 | void unregister_test_dev_kmod(struct kmod_test_device *test_dev) |
| 1193 | { |
| 1194 | mutex_lock(&test_dev->trigger_mutex); |
| 1195 | mutex_lock(&test_dev->config_mutex); |
| 1196 | |
| 1197 | test_dev_kmod_stop_tests(test_dev); |
| 1198 | |
| 1199 | dev_info(test_dev->dev, "removing interface\n"); |
| 1200 | misc_deregister(&test_dev->misc_dev); |
Luis R. Rodriguez | d9c6a72 | 2017-07-14 14:50:08 -0700 | [diff] [blame] | 1201 | |
| 1202 | mutex_unlock(&test_dev->config_mutex); |
| 1203 | mutex_unlock(&test_dev->trigger_mutex); |
| 1204 | |
| 1205 | free_test_dev_kmod(test_dev); |
| 1206 | } |
| 1207 | |
| 1208 | static void __exit test_kmod_exit(void) |
| 1209 | { |
| 1210 | struct kmod_test_device *test_dev, *tmp; |
| 1211 | |
| 1212 | mutex_lock(®_dev_mutex); |
| 1213 | list_for_each_entry_safe(test_dev, tmp, ®_test_devs, list) { |
| 1214 | list_del(&test_dev->list); |
| 1215 | unregister_test_dev_kmod(test_dev); |
| 1216 | } |
| 1217 | mutex_unlock(®_dev_mutex); |
| 1218 | } |
| 1219 | module_exit(test_kmod_exit); |
| 1220 | |
| 1221 | MODULE_AUTHOR("Luis R. Rodriguez <mcgrof@kernel.org>"); |
| 1222 | MODULE_LICENSE("GPL"); |