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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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/* * This driver provides an interface to trigger and test the kernel's * module loader through a series of configurations and a few triggers. * To test this driver use the following script as root: * * tools/testing/selftests/kmod/kmod.sh --help */
#include <linux/kernel.h>#include <linux/module.h>#include <linux/kmod.h>#include <linux/printk.h>#include <linux/kthread.h>#include <linux/sched.h>#include <linux/fs.h>#include <linux/miscdevice.h>#include <linux/vmalloc.h>#include <linux/slab.h>#include <linux/device.h>
#define TEST_START_NUM_THREADS 50#define TEST_START_DRIVER "test_module"#define TEST_START_TEST_CASE TEST_KMOD_DRIVER
static bool force_init_test = false;module_param(force_init_test, bool_enable_only, 0444);MODULE_PARM_DESC(force_init_test, "Force kicking a test immediately after driver loads");static char *start_driver;module_param(start_driver, charp, 0444);MODULE_PARM_DESC(start_driver, "Module/driver to use for the testing after driver loads");static char *start_test_fs;module_param(start_test_fs, charp, 0444);MODULE_PARM_DESC(start_test_fs, "File system to use for the testing after driver loads");
/* * For device allocation / registration */static DEFINE_MUTEX(reg_dev_mutex);static LIST_HEAD(reg_test_devs);
/* * num_test_devs actually represents the *next* ID of the next * device we will allow to create. */static int num_test_devs;
/** * enum kmod_test_case - linker table test case * @TEST_KMOD_DRIVER: stress tests request_module() * @TEST_KMOD_FS_TYPE: stress tests get_fs_type() * * If you add a test case, please be sure to review if you need to set * @need_mod_put for your tests case. */enum kmod_test_case { /* private: */ __TEST_KMOD_INVALID = 0, /* public: */
TEST_KMOD_DRIVER, TEST_KMOD_FS_TYPE,
/* private: */ __TEST_KMOD_MAX,};
struct test_config { char *test_driver; char *test_fs; unsigned int num_threads; enum kmod_test_case test_case; int test_result;};
struct kmod_test_device;
/** * struct kmod_test_device_info - thread info * * @ret_sync: return value if request_module() is used, sync request for * @TEST_KMOD_DRIVER * @fs_sync: return value of get_fs_type() for @TEST_KMOD_FS_TYPE * @task_sync: kthread's task_struct or %NULL if not running * @thread_idx: thread ID * @test_dev: test device test is being performed under * @need_mod_put: Some tests (get_fs_type() is one) requires putting the module * (module_put(fs_sync->owner)) when done, otherwise you will not be able * to unload the respective modules and re-test. We use this to keep * accounting of when we need this and to help out in case we need to * error out and deal with module_put() on error. */struct kmod_test_device_info { int ret_sync; struct file_system_type *fs_sync; struct task_struct *task_sync; unsigned int thread_idx; struct kmod_test_device *test_dev; bool need_mod_put;};
/** * struct kmod_test_device - test device to help test kmod * * @dev_idx: unique ID for test device * @config: configuration for the test * @misc_dev: we use a misc device under the hood * @dev: pointer to misc_dev's own struct device * @config_mutex: protects configuration of test * @trigger_mutex: the test trigger can only be fired once at a time * @thread_mutex: protects @done count, and the @info per each thread * @done: number of threads which have completed or failed * @test_is_oom: when we run out of memory, use this to halt moving forward * @kthreads_done: completion used to signal when all work is done * @list: needed to be part of the reg_test_devs * @info: array of info for each thread */struct kmod_test_device { int dev_idx; struct test_config config; struct miscdevice misc_dev; struct device *dev; struct mutex config_mutex; struct mutex trigger_mutex; struct mutex thread_mutex;
unsigned int done;
bool test_is_oom; struct completion kthreads_done; struct list_head list;
struct kmod_test_device_info *info;};
static const char *test_case_str(enum kmod_test_case test_case){ switch (test_case) { case TEST_KMOD_DRIVER: return "TEST_KMOD_DRIVER"; case TEST_KMOD_FS_TYPE: return "TEST_KMOD_FS_TYPE"; default: return "invalid"; }}
static struct miscdevice *dev_to_misc_dev(struct device *dev){ return dev_get_drvdata(dev);}
static struct kmod_test_device *misc_dev_to_test_dev(struct miscdevice *misc_dev){ return container_of(misc_dev, struct kmod_test_device, misc_dev);}
static struct kmod_test_device *dev_to_test_dev(struct device *dev){ struct miscdevice *misc_dev;
misc_dev = dev_to_misc_dev(dev);
return misc_dev_to_test_dev(misc_dev);}
/* Must run with thread_mutex held */static void kmod_test_done_check(struct kmod_test_device *test_dev, unsigned int idx){ struct test_config *config = &test_dev->config;
test_dev->done++; dev_dbg(test_dev->dev, "Done thread count: %u\n", test_dev->done);
if (test_dev->done == config->num_threads) { dev_info(test_dev->dev, "Done: %u threads have all run now\n", test_dev->done); dev_info(test_dev->dev, "Last thread to run: %u\n", idx); complete(&test_dev->kthreads_done); }}
static void test_kmod_put_module(struct kmod_test_device_info *info){ struct kmod_test_device *test_dev = info->test_dev; struct test_config *config = &test_dev->config;
if (!info->need_mod_put) return;
switch (config->test_case) { case TEST_KMOD_DRIVER: break; case TEST_KMOD_FS_TYPE: if (info->fs_sync && info->fs_sync->owner) module_put(info->fs_sync->owner); break; default: BUG(); }
info->need_mod_put = true;}
static int run_request(void *data){ struct kmod_test_device_info *info = data; struct kmod_test_device *test_dev = info->test_dev; struct test_config *config = &test_dev->config;
switch (config->test_case) { case TEST_KMOD_DRIVER: info->ret_sync = request_module("%s", config->test_driver); break; case TEST_KMOD_FS_TYPE: info->fs_sync = get_fs_type(config->test_fs); info->need_mod_put = true; break; default: /* __trigger_config_run() already checked for test sanity */ BUG(); return -EINVAL; }
dev_dbg(test_dev->dev, "Ran thread %u\n", info->thread_idx);
test_kmod_put_module(info);
mutex_lock(&test_dev->thread_mutex); info->task_sync = NULL; kmod_test_done_check(test_dev, info->thread_idx); mutex_unlock(&test_dev->thread_mutex);
return 0;}
static int tally_work_test(struct kmod_test_device_info *info){ struct kmod_test_device *test_dev = info->test_dev; struct test_config *config = &test_dev->config; int err_ret = 0;
switch (config->test_case) { case TEST_KMOD_DRIVER: /* * Only capture errors, if one is found that's * enough, for now. */ if (info->ret_sync != 0) err_ret = info->ret_sync; dev_info(test_dev->dev, "Sync thread %d return status: %d\n", info->thread_idx, info->ret_sync); break; case TEST_KMOD_FS_TYPE: /* For now we make this simple */ if (!info->fs_sync) err_ret = -EINVAL; dev_info(test_dev->dev, "Sync thread %u fs: %s\n", info->thread_idx, info->fs_sync ? config->test_fs : "NULL"); break; default: BUG(); }
return err_ret;}
/* * XXX: add result option to display if all errors did not match. * For now we just keep any error code if one was found. * * If this ran it means *all* tasks were created fine and we * are now just collecting results. * * Only propagate errors, do not override with a subsequent success case. */static void tally_up_work(struct kmod_test_device *test_dev){ struct test_config *config = &test_dev->config; struct kmod_test_device_info *info; unsigned int idx; int err_ret = 0; int ret = 0;
mutex_lock(&test_dev->thread_mutex);
dev_info(test_dev->dev, "Results:\n");
for (idx=0; idx < config->num_threads; idx++) { info = &test_dev->info[idx]; ret = tally_work_test(info); if (ret) err_ret = ret; }
/* * Note: request_module() returns 256 for a module not found even * though modprobe itself returns 1. */ config->test_result = err_ret;
mutex_unlock(&test_dev->thread_mutex);}
static int try_one_request(struct kmod_test_device *test_dev, unsigned int idx){ struct kmod_test_device_info *info = &test_dev->info[idx]; int fail_ret = -ENOMEM;
mutex_lock(&test_dev->thread_mutex);
info->thread_idx = idx; info->test_dev = test_dev; info->task_sync = kthread_run(run_request, info, "%s-%u", KBUILD_MODNAME, idx);
if (!info->task_sync || IS_ERR(info->task_sync)) { test_dev->test_is_oom = true; dev_err(test_dev->dev, "Setting up thread %u failed\n", idx); info->task_sync = NULL; goto err_out; } else dev_dbg(test_dev->dev, "Kicked off thread %u\n", idx);
mutex_unlock(&test_dev->thread_mutex);
return 0;
err_out: info->ret_sync = fail_ret; mutex_unlock(&test_dev->thread_mutex);
return fail_ret;}
static void test_dev_kmod_stop_tests(struct kmod_test_device *test_dev){ struct test_config *config = &test_dev->config; struct kmod_test_device_info *info; unsigned int i;
dev_info(test_dev->dev, "Ending request_module() tests\n");
mutex_lock(&test_dev->thread_mutex);
for (i=0; i < config->num_threads; i++) { info = &test_dev->info[i]; if (info->task_sync && !IS_ERR(info->task_sync)) { dev_info(test_dev->dev, "Stopping still-running thread %i\n", i); kthread_stop(info->task_sync); }
/* * info->task_sync is well protected, it can only be * NULL or a pointer to a struct. If its NULL we either * never ran, or we did and we completed the work. Completed * tasks *always* put the module for us. This is a sanity * check -- just in case. */ if (info->task_sync && info->need_mod_put) test_kmod_put_module(info); }
mutex_unlock(&test_dev->thread_mutex);}
/* * Only wait *iff* we did not run into any errors during all of our thread * set up. If run into any issues we stop threads and just bail out with * an error to the trigger. This also means we don't need any tally work * for any threads which fail. */static int try_requests(struct kmod_test_device *test_dev){ struct test_config *config = &test_dev->config; unsigned int idx; int ret; bool any_error = false;
for (idx=0; idx < config->num_threads; idx++) { if (test_dev->test_is_oom) { any_error = true; break; }
ret = try_one_request(test_dev, idx); if (ret) { any_error = true; break; } }
if (!any_error) { test_dev->test_is_oom = false; dev_info(test_dev->dev, "No errors were found while initializing threads\n"); wait_for_completion(&test_dev->kthreads_done); tally_up_work(test_dev); } else { test_dev->test_is_oom = true; dev_info(test_dev->dev, "At least one thread failed to start, stop all work\n"); test_dev_kmod_stop_tests(test_dev); return -ENOMEM; }
return 0;}
static int run_test_driver(struct kmod_test_device *test_dev){ struct test_config *config = &test_dev->config;
dev_info(test_dev->dev, "Test case: %s (%u)\n", test_case_str(config->test_case), config->test_case); dev_info(test_dev->dev, "Test driver to load: %s\n", config->test_driver); dev_info(test_dev->dev, "Number of threads to run: %u\n", config->num_threads); dev_info(test_dev->dev, "Thread IDs will range from 0 - %u\n", config->num_threads - 1);
return try_requests(test_dev);}
static int run_test_fs_type(struct kmod_test_device *test_dev){ struct test_config *config = &test_dev->config;
dev_info(test_dev->dev, "Test case: %s (%u)\n", test_case_str(config->test_case), config->test_case); dev_info(test_dev->dev, "Test filesystem to load: %s\n", config->test_fs); dev_info(test_dev->dev, "Number of threads to run: %u\n", config->num_threads); dev_info(test_dev->dev, "Thread IDs will range from 0 - %u\n", config->num_threads - 1);
return try_requests(test_dev);}
static ssize_t config_show(struct device *dev, struct device_attribute *attr, char *buf){ struct kmod_test_device *test_dev = dev_to_test_dev(dev); struct test_config *config = &test_dev->config; int len = 0;
mutex_lock(&test_dev->config_mutex);
len += snprintf(buf, PAGE_SIZE, "Custom trigger configuration for: %s\n", dev_name(dev));
len += snprintf(buf+len, PAGE_SIZE - len, "Number of threads:\t%u\n", config->num_threads);
len += snprintf(buf+len, PAGE_SIZE - len, "Test_case:\t%s (%u)\n", test_case_str(config->test_case), config->test_case);
if (config->test_driver) len += snprintf(buf+len, PAGE_SIZE - len, "driver:\t%s\n", config->test_driver); else len += snprintf(buf+len, PAGE_SIZE - len, "driver:\tEMPTY\n");
if (config->test_fs) len += snprintf(buf+len, PAGE_SIZE - len, "fs:\t%s\n", config->test_fs); else len += snprintf(buf+len, PAGE_SIZE - len, "fs:\tEMPTY\n");
mutex_unlock(&test_dev->config_mutex);
return len;}static DEVICE_ATTR_RO(config);
/* * This ensures we don't allow kicking threads through if our configuration * is faulty. */static int __trigger_config_run(struct kmod_test_device *test_dev){ struct test_config *config = &test_dev->config;
test_dev->done = 0;
switch (config->test_case) { case TEST_KMOD_DRIVER: return run_test_driver(test_dev); case TEST_KMOD_FS_TYPE: if (!config->test_fs) { dev_warn(test_dev->dev, "No fs type specified, can't run the test\n"); return -EINVAL; } return run_test_fs_type(test_dev); default: dev_warn(test_dev->dev, "Invalid test case requested: %u\n", config->test_case); return -EINVAL; }}
static int trigger_config_run(struct kmod_test_device *test_dev){ struct test_config *config = &test_dev->config; int ret;
mutex_lock(&test_dev->trigger_mutex); mutex_lock(&test_dev->config_mutex);
ret = __trigger_config_run(test_dev); if (ret < 0) goto out; dev_info(test_dev->dev, "General test result: %d\n", config->test_result);
/* * We must return 0 after a trigger even unless something went * wrong with the setup of the test. If the test setup went fine * then userspace must just check the result of config->test_result. * One issue with relying on the return from a call in the kernel * is if the kernel returns a positive value using this trigger * will not return the value to userspace, it would be lost. * * By not relying on capturing the return value of tests we are using * through the trigger it also us to run tests with set -e and only * fail when something went wrong with the driver upon trigger * requests. */ ret = 0;
out: mutex_unlock(&test_dev->config_mutex); mutex_unlock(&test_dev->trigger_mutex);
return ret;}
static ssize_ttrigger_config_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count){ struct kmod_test_device *test_dev = dev_to_test_dev(dev); int ret;
if (test_dev->test_is_oom) return -ENOMEM;
/* For all intents and purposes we don't care what userspace * sent this trigger, we care only that we were triggered. * We treat the return value only for caputuring issues with * the test setup. At this point all the test variables should * have been allocated so typically this should never fail. */ ret = trigger_config_run(test_dev); if (unlikely(ret < 0)) goto out;
/* * Note: any return > 0 will be treated as success * and the error value will not be available to userspace. * Do not rely on trying to send to userspace a test value * return value as positive return errors will be lost. */ if (WARN_ON(ret > 0)) return -EINVAL;
ret = count;out: return ret;}static DEVICE_ATTR_WO(trigger_config);
/* * XXX: move to kstrncpy() once merged. * * Users should use kfree_const() when freeing these. */static int __kstrncpy(char **dst, const char *name, size_t count, gfp_t gfp){ *dst = kstrndup(name, count, gfp); if (!*dst) return -ENOSPC; return count;}
static int config_copy_test_driver_name(struct test_config *config, const char *name, size_t count){ return __kstrncpy(&config->test_driver, name, count, GFP_KERNEL);}
static int config_copy_test_fs(struct test_config *config, const char *name, size_t count){ return __kstrncpy(&config->test_fs, name, count, GFP_KERNEL);}
static void __kmod_config_free(struct test_config *config){ if (!config) return;
kfree_const(config->test_driver); config->test_driver = NULL;
kfree_const(config->test_fs); config->test_fs = NULL;}
static void kmod_config_free(struct kmod_test_device *test_dev){ struct test_config *config;
if (!test_dev) return;
config = &test_dev->config;
mutex_lock(&test_dev->config_mutex); __kmod_config_free(config); mutex_unlock(&test_dev->config_mutex);}
static ssize_t config_test_driver_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count){ struct kmod_test_device *test_dev = dev_to_test_dev(dev); struct test_config *config = &test_dev->config; int copied;
mutex_lock(&test_dev->config_mutex);
kfree_const(config->test_driver); config->test_driver = NULL;
copied = config_copy_test_driver_name(config, buf, count); mutex_unlock(&test_dev->config_mutex);
return copied;}
/* * As per sysfs_kf_seq_show() the buf is max PAGE_SIZE. */static ssize_t config_test_show_str(struct mutex *config_mutex, char *dst, char *src){ int len;
mutex_lock(config_mutex); len = snprintf(dst, PAGE_SIZE, "%s\n", src); mutex_unlock(config_mutex);
return len;}
static ssize_t config_test_driver_show(struct device *dev, struct device_attribute *attr, char *buf){ struct kmod_test_device *test_dev = dev_to_test_dev(dev); struct test_config *config = &test_dev->config;
return config_test_show_str(&test_dev->config_mutex, buf, config->test_driver);}static DEVICE_ATTR_RW(config_test_driver);
static ssize_t config_test_fs_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count){ struct kmod_test_device *test_dev = dev_to_test_dev(dev); struct test_config *config = &test_dev->config; int copied;
mutex_lock(&test_dev->config_mutex);
kfree_const(config->test_fs); config->test_fs = NULL;
copied = config_copy_test_fs(config, buf, count); mutex_unlock(&test_dev->config_mutex);
return copied;}
static ssize_t config_test_fs_show(struct device *dev, struct device_attribute *attr, char *buf){ struct kmod_test_device *test_dev = dev_to_test_dev(dev); struct test_config *config = &test_dev->config;
return config_test_show_str(&test_dev->config_mutex, buf, config->test_fs);}static DEVICE_ATTR_RW(config_test_fs);
static int trigger_config_run_type(struct kmod_test_device *test_dev, enum kmod_test_case test_case){ struct test_config *config = &test_dev->config;
mutex_lock(&test_dev->config_mutex);
switch (test_case) { case TEST_KMOD_DRIVER: break; case TEST_KMOD_FS_TYPE: if (!config->test_fs) { mutex_unlock(&test_dev->config_mutex); return 0; } break; default: mutex_unlock(&test_dev->config_mutex); return -EINVAL; }
config->test_case = test_case;
mutex_unlock(&test_dev->config_mutex);
test_dev->test_is_oom = false;
return trigger_config_run(test_dev);}
static void free_test_dev_info(struct kmod_test_device *test_dev){ vfree(test_dev->info); test_dev->info = NULL;}
static int kmod_config_sync_info(struct kmod_test_device *test_dev){ struct test_config *config = &test_dev->config;
free_test_dev_info(test_dev); test_dev->info = vzalloc(array_size(sizeof(struct kmod_test_device_info), config->num_threads)); if (!test_dev->info) return -ENOMEM;
return 0;}
/* * Old kernels may not have this, if you want to port this code to * test it on older kernels. */#ifdef get_kmod_umh_limitstatic unsigned int kmod_init_test_thread_limit(void){ return get_kmod_umh_limit();}#elsestatic unsigned int kmod_init_test_thread_limit(void){ return TEST_START_NUM_THREADS;}#endif
static int __kmod_config_init(struct kmod_test_device *test_dev){ struct test_config *config = &test_dev->config; const char *test_start_driver = start_driver ? start_driver : TEST_START_DRIVER; int ret = -ENOMEM, copied;
__kmod_config_free(config);
copied = config_copy_test_driver_name(config, test_start_driver, strlen(test_start_driver)); if (copied != strlen(test_start_driver)) goto err_out;
if (start_test_fs) { copied = config_copy_test_fs(config, start_test_fs, strlen(start_test_fs)); if (copied != strlen(start_test_fs)) goto err_out; }
config->num_threads = kmod_init_test_thread_limit(); config->test_result = 0; config->test_case = TEST_START_TEST_CASE;
ret = kmod_config_sync_info(test_dev); if (ret) goto err_out;
test_dev->test_is_oom = false;
return 0;
err_out: test_dev->test_is_oom = true; WARN_ON(test_dev->test_is_oom);
__kmod_config_free(config);
return ret;}
static ssize_t reset_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count){ struct kmod_test_device *test_dev = dev_to_test_dev(dev); int ret;
mutex_lock(&test_dev->trigger_mutex); mutex_lock(&test_dev->config_mutex);
ret = __kmod_config_init(test_dev); if (ret < 0) { ret = -ENOMEM; dev_err(dev, "could not alloc settings for config trigger: %d\n", ret); goto out; }
dev_info(dev, "reset\n"); ret = count;
out: mutex_unlock(&test_dev->config_mutex); mutex_unlock(&test_dev->trigger_mutex);
return ret;}static DEVICE_ATTR_WO(reset);
static int test_dev_config_update_uint_sync(struct kmod_test_device *test_dev, const char *buf, size_t size, unsigned int *config, int (*test_sync)(struct kmod_test_device *test_dev)){ int ret; unsigned int val; unsigned int old_val;
ret = kstrtouint(buf, 10, &val); if (ret) return ret;
mutex_lock(&test_dev->config_mutex);
old_val = *config; *(unsigned int *)config = val;
ret = test_sync(test_dev); if (ret) { *(unsigned int *)config = old_val;
ret = test_sync(test_dev); WARN_ON(ret);
mutex_unlock(&test_dev->config_mutex); return -EINVAL; }
mutex_unlock(&test_dev->config_mutex); /* Always return full write size even if we didn't consume all */ return size;}
static int test_dev_config_update_uint_range(struct kmod_test_device *test_dev, const char *buf, size_t size, unsigned int *config, unsigned int min, unsigned int max){ unsigned int val; int ret;
ret = kstrtouint(buf, 10, &val); if (ret) return ret;
if (val < min || val > max) return -EINVAL;
mutex_lock(&test_dev->config_mutex); *config = val; mutex_unlock(&test_dev->config_mutex);
/* Always return full write size even if we didn't consume all */ return size;}
static int test_dev_config_update_int(struct kmod_test_device *test_dev, const char *buf, size_t size, int *config){ int val; int ret;
ret = kstrtoint(buf, 10, &val); if (ret) return ret;
mutex_lock(&test_dev->config_mutex); *config = val; mutex_unlock(&test_dev->config_mutex); /* Always return full write size even if we didn't consume all */ return size;}
static ssize_t test_dev_config_show_int(struct kmod_test_device *test_dev, char *buf, int config){ int val;
mutex_lock(&test_dev->config_mutex); val = config; mutex_unlock(&test_dev->config_mutex);
return snprintf(buf, PAGE_SIZE, "%d\n", val);}
static ssize_t test_dev_config_show_uint(struct kmod_test_device *test_dev, char *buf, unsigned int config){ unsigned int val;
mutex_lock(&test_dev->config_mutex); val = config; mutex_unlock(&test_dev->config_mutex);
return snprintf(buf, PAGE_SIZE, "%u\n", val);}
static ssize_t test_result_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count){ struct kmod_test_device *test_dev = dev_to_test_dev(dev); struct test_config *config = &test_dev->config;
return test_dev_config_update_int(test_dev, buf, count, &config->test_result);}
static ssize_t config_num_threads_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count){ struct kmod_test_device *test_dev = dev_to_test_dev(dev); struct test_config *config = &test_dev->config;
return test_dev_config_update_uint_sync(test_dev, buf, count, &config->num_threads, kmod_config_sync_info);}
static ssize_t config_num_threads_show(struct device *dev, struct device_attribute *attr, char *buf){ struct kmod_test_device *test_dev = dev_to_test_dev(dev); struct test_config *config = &test_dev->config;
return test_dev_config_show_int(test_dev, buf, config->num_threads);}static DEVICE_ATTR_RW(config_num_threads);
static ssize_t config_test_case_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count){ struct kmod_test_device *test_dev = dev_to_test_dev(dev); struct test_config *config = &test_dev->config;
return test_dev_config_update_uint_range(test_dev, buf, count, &config->test_case, __TEST_KMOD_INVALID + 1, __TEST_KMOD_MAX - 1);}
static ssize_t config_test_case_show(struct device *dev, struct device_attribute *attr, char *buf){ struct kmod_test_device *test_dev = dev_to_test_dev(dev); struct test_config *config = &test_dev->config;
return test_dev_config_show_uint(test_dev, buf, config->test_case);}static DEVICE_ATTR_RW(config_test_case);
static ssize_t test_result_show(struct device *dev, struct device_attribute *attr, char *buf){ struct kmod_test_device *test_dev = dev_to_test_dev(dev); struct test_config *config = &test_dev->config;
return test_dev_config_show_int(test_dev, buf, config->test_result);}static DEVICE_ATTR_RW(test_result);
#define TEST_KMOD_DEV_ATTR(name) &dev_attr_##name.attr
static struct attribute *test_dev_attrs[] = { TEST_KMOD_DEV_ATTR(trigger_config), TEST_KMOD_DEV_ATTR(config), TEST_KMOD_DEV_ATTR(reset),
TEST_KMOD_DEV_ATTR(config_test_driver), TEST_KMOD_DEV_ATTR(config_test_fs), TEST_KMOD_DEV_ATTR(config_num_threads), TEST_KMOD_DEV_ATTR(config_test_case), TEST_KMOD_DEV_ATTR(test_result),
NULL,};
ATTRIBUTE_GROUPS(test_dev);
static int kmod_config_init(struct kmod_test_device *test_dev){ int ret;
mutex_lock(&test_dev->config_mutex); ret = __kmod_config_init(test_dev); mutex_unlock(&test_dev->config_mutex);
return ret;}
static struct kmod_test_device *alloc_test_dev_kmod(int idx){ int ret; struct kmod_test_device *test_dev; struct miscdevice *misc_dev;
test_dev = vzalloc(sizeof(struct kmod_test_device)); if (!test_dev) goto err_out;
mutex_init(&test_dev->config_mutex); mutex_init(&test_dev->trigger_mutex); mutex_init(&test_dev->thread_mutex);
init_completion(&test_dev->kthreads_done);
ret = kmod_config_init(test_dev); if (ret < 0) { pr_err("Cannot alloc kmod_config_init()\n"); goto err_out_free; }
test_dev->dev_idx = idx; misc_dev = &test_dev->misc_dev;
misc_dev->minor = MISC_DYNAMIC_MINOR; misc_dev->name = kasprintf(GFP_KERNEL, "test_kmod%d", idx); if (!misc_dev->name) { pr_err("Cannot alloc misc_dev->name\n"); goto err_out_free_config; } misc_dev->groups = test_dev_groups;
return test_dev;
err_out_free_config: free_test_dev_info(test_dev); kmod_config_free(test_dev);err_out_free: vfree(test_dev); test_dev = NULL;err_out: return NULL;}
static void free_test_dev_kmod(struct kmod_test_device *test_dev){ if (test_dev) { kfree_const(test_dev->misc_dev.name); test_dev->misc_dev.name = NULL; free_test_dev_info(test_dev); kmod_config_free(test_dev); vfree(test_dev); test_dev = NULL; }}
static struct kmod_test_device *register_test_dev_kmod(void){ struct kmod_test_device *test_dev = NULL; int ret;
mutex_lock(®_dev_mutex);
/* int should suffice for number of devices, test for wrap */ if (num_test_devs + 1 == INT_MAX) { pr_err("reached limit of number of test devices\n"); goto out; }
test_dev = alloc_test_dev_kmod(num_test_devs); if (!test_dev) goto out;
ret = misc_register(&test_dev->misc_dev); if (ret) { pr_err("could not register misc device: %d\n", ret); free_test_dev_kmod(test_dev); test_dev = NULL; goto out; }
test_dev->dev = test_dev->misc_dev.this_device; list_add_tail(&test_dev->list, ®_test_devs); dev_info(test_dev->dev, "interface ready\n");
num_test_devs++;
out: mutex_unlock(®_dev_mutex);
return test_dev;
}
static int __init test_kmod_init(void){ struct kmod_test_device *test_dev; int ret;
test_dev = register_test_dev_kmod(); if (!test_dev) { pr_err("Cannot add first test kmod device\n"); return -ENODEV; }
/* * With some work we might be able to gracefully enable * testing with this driver built-in, for now this seems * rather risky. For those willing to try have at it, * and enable the below. Good luck! If that works, try * lowering the init level for more fun. */ if (force_init_test) { ret = trigger_config_run_type(test_dev, TEST_KMOD_DRIVER); if (WARN_ON(ret)) return ret;
ret = trigger_config_run_type(test_dev, TEST_KMOD_FS_TYPE); if (WARN_ON(ret)) return ret; }
return 0;}late_initcall(test_kmod_init);
staticvoid unregister_test_dev_kmod(struct kmod_test_device *test_dev){ mutex_lock(&test_dev->trigger_mutex); mutex_lock(&test_dev->config_mutex);
test_dev_kmod_stop_tests(test_dev);
dev_info(test_dev->dev, "removing interface\n"); misc_deregister(&test_dev->misc_dev);
mutex_unlock(&test_dev->config_mutex); mutex_unlock(&test_dev->trigger_mutex);
free_test_dev_kmod(test_dev);}
static void __exit test_kmod_exit(void){ struct kmod_test_device *test_dev, *tmp;
mutex_lock(®_dev_mutex); list_for_each_entry_safe(test_dev, tmp, ®_test_devs, list) { list_del(&test_dev->list); unregister_test_dev_kmod(test_dev); } mutex_unlock(®_dev_mutex);}module_exit(test_kmod_exit);
MODULE_AUTHOR("Luis R. Rodriguez <mcgrof@kernel.org>");MODULE_DESCRIPTION("kmod stress test driver");MODULE_LICENSE("GPL");