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1232 lines
30 KiB
1232 lines
30 KiB
/* |
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* kmod stress test driver |
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* |
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* Copyright (C) 2017 Luis R. Rodriguez <[email protected]> |
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* |
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* This program is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License as published by the Free |
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* Software Foundation; either version 2 of the License, or at your option any |
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* later version; or, when distributed separately from the Linux kernel or |
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* when incorporated into other software packages, subject to the following |
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* license: |
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* |
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* This program is free software; you can redistribute it and/or modify it |
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* under the terms of copyleft-next (version 0.3.1 or later) as published |
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* at http://copyleft-next.org/. |
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*/ |
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
|
|
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/* |
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* This driver provides an interface to trigger and test the kernel's |
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* module loader through a series of configurations and a few triggers. |
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* To test this driver use the following script as root: |
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* |
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* tools/testing/selftests/kmod/kmod.sh --help |
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*/ |
|
|
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#include <linux/kernel.h> |
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#include <linux/module.h> |
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#include <linux/kmod.h> |
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#include <linux/printk.h> |
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#include <linux/kthread.h> |
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#include <linux/sched.h> |
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#include <linux/fs.h> |
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#include <linux/miscdevice.h> |
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#include <linux/vmalloc.h> |
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#include <linux/slab.h> |
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#include <linux/device.h> |
|
|
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#define TEST_START_NUM_THREADS 50 |
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#define TEST_START_DRIVER "test_module" |
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#define TEST_START_TEST_FS "xfs" |
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#define TEST_START_TEST_CASE TEST_KMOD_DRIVER |
|
|
|
|
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static bool force_init_test = false; |
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module_param(force_init_test, bool_enable_only, 0644); |
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MODULE_PARM_DESC(force_init_test, |
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"Force kicking a test immediately after driver loads"); |
|
|
|
/* |
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* For device allocation / registration |
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*/ |
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static DEFINE_MUTEX(reg_dev_mutex); |
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static LIST_HEAD(reg_test_devs); |
|
|
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/* |
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* num_test_devs actually represents the *next* ID of the next |
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* device we will allow to create. |
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*/ |
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static int num_test_devs; |
|
|
|
/** |
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* enum kmod_test_case - linker table test case |
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* |
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* If you add a test case, please be sure to review if you need to se |
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* @need_mod_put for your tests case. |
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* |
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* @TEST_KMOD_DRIVER: stress tests request_module() |
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* @TEST_KMOD_FS_TYPE: stress tests get_fs_type() |
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*/ |
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enum kmod_test_case { |
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__TEST_KMOD_INVALID = 0, |
|
|
|
TEST_KMOD_DRIVER, |
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TEST_KMOD_FS_TYPE, |
|
|
|
__TEST_KMOD_MAX, |
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}; |
|
|
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struct test_config { |
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char *test_driver; |
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char *test_fs; |
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unsigned int num_threads; |
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enum kmod_test_case test_case; |
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int test_result; |
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}; |
|
|
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struct kmod_test_device; |
|
|
|
/** |
|
* kmod_test_device_info - thread info |
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* |
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* @ret_sync: return value if request_module() is used, sync request for |
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* @TEST_KMOD_DRIVER |
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* @fs_sync: return value of get_fs_type() for @TEST_KMOD_FS_TYPE |
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* @thread_idx: thread ID |
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* @test_dev: test device test is being performed under |
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* @need_mod_put: Some tests (get_fs_type() is one) requires putting the module |
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* (module_put(fs_sync->owner)) when done, otherwise you will not be able |
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* to unload the respective modules and re-test. We use this to keep |
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* accounting of when we need this and to help out in case we need to |
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* error out and deal with module_put() on error. |
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*/ |
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struct kmod_test_device_info { |
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int ret_sync; |
|
struct file_system_type *fs_sync; |
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struct task_struct *task_sync; |
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unsigned int thread_idx; |
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struct kmod_test_device *test_dev; |
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bool need_mod_put; |
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}; |
|
|
|
/** |
|
* kmod_test_device - test device to help test kmod |
|
* |
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* @dev_idx: unique ID for test device |
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* @config: configuration for the test |
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* @misc_dev: we use a misc device under the hood |
|
* @dev: pointer to misc_dev's own struct device |
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* @config_mutex: protects configuration of test |
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* @trigger_mutex: the test trigger can only be fired once at a time |
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* @thread_lock: protects @done count, and the @info per each thread |
|
* @done: number of threads which have completed or failed |
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* @test_is_oom: when we run out of memory, use this to halt moving forward |
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* @kthreads_done: completion used to signal when all work is done |
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* @list: needed to be part of the reg_test_devs |
|
* @info: array of info for each thread |
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*/ |
|
struct kmod_test_device { |
|
int dev_idx; |
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struct test_config config; |
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struct miscdevice misc_dev; |
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struct device *dev; |
|
struct mutex config_mutex; |
|
struct mutex trigger_mutex; |
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struct mutex thread_mutex; |
|
|
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unsigned int done; |
|
|
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bool test_is_oom; |
|
struct completion kthreads_done; |
|
struct list_head list; |
|
|
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struct kmod_test_device_info *info; |
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}; |
|
|
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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"; |
|
} |
|
} |
|
|
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static struct miscdevice *dev_to_misc_dev(struct device *dev) |
|
{ |
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return dev_get_drvdata(dev); |
|
} |
|
|
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static struct kmod_test_device *misc_dev_to_test_dev(struct miscdevice *misc_dev) |
|
{ |
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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); |
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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; |
|
} |
|
|
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static int run_request(void *data) |
|
{ |
|
struct kmod_test_device_info *info = data; |
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struct kmod_test_device *test_dev = info->test_dev; |
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struct test_config *config = &test_dev->config; |
|
|
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switch (config->test_case) { |
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case TEST_KMOD_DRIVER: |
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info->ret_sync = request_module("%s", config->test_driver); |
|
break; |
|
case TEST_KMOD_FS_TYPE: |
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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(); |
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return -EINVAL; |
|
} |
|
|
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dev_dbg(test_dev->dev, "Ran thread %u\n", info->thread_idx); |
|
|
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test_kmod_put_module(info); |
|
|
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mutex_lock(&test_dev->thread_mutex); |
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info->task_sync = NULL; |
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kmod_test_done_check(test_dev, info->thread_idx); |
|
mutex_unlock(&test_dev->thread_mutex); |
|
|
|
return 0; |
|
} |
|
|
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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) |
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err_ret = info->ret_sync; |
|
dev_info(test_dev->dev, |
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"Sync thread %d return status: %d\n", |
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info->thread_idx, info->ret_sync); |
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break; |
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case TEST_KMOD_FS_TYPE: |
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/* For now we make this simple */ |
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if (!info->fs_sync) |
|
err_ret = -EINVAL; |
|
dev_info(test_dev->dev, "Sync thread %u fs: %s\n", |
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info->thread_idx, info->fs_sync ? config->test_fs : |
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"NULL"); |
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break; |
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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 |
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* are now just collecting results. |
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* |
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* Only propagate errors, do not override with a subsequent sucess case. |
|
*/ |
|
static void tally_up_work(struct kmod_test_device *test_dev) |
|
{ |
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struct test_config *config = &test_dev->config; |
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struct kmod_test_device_info *info; |
|
unsigned int idx; |
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int err_ret = 0; |
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int ret = 0; |
|
|
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mutex_lock(&test_dev->thread_mutex); |
|
|
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dev_info(test_dev->dev, "Results:\n"); |
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|
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for (idx=0; idx < config->num_threads; idx++) { |
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info = &test_dev->info[idx]; |
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ret = tally_work_test(info); |
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if (ret) |
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err_ret = ret; |
|
} |
|
|
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/* |
|
* Note: request_module() returns 256 for a module not found even |
|
* though modprobe itself returns 1. |
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*/ |
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config->test_result = err_ret; |
|
|
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mutex_unlock(&test_dev->thread_mutex); |
|
} |
|
|
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static int try_one_request(struct kmod_test_device *test_dev, unsigned int idx) |
|
{ |
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struct kmod_test_device_info *info = &test_dev->info[idx]; |
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int fail_ret = -ENOMEM; |
|
|
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mutex_lock(&test_dev->thread_mutex); |
|
|
|
info->thread_idx = idx; |
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info->test_dev = test_dev; |
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info->task_sync = kthread_run(run_request, info, "%s-%u", |
|
KBUILD_MODNAME, idx); |
|
|
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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; |
|
} |
|
|
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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; |
|
|
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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: |
|
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 possitive 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_t |
|
trigger_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 possitive 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, |
|
const char *test_str) |
|
{ |
|
int copied = 0; |
|
struct test_config *config = &test_dev->config; |
|
|
|
mutex_lock(&test_dev->config_mutex); |
|
|
|
switch (test_case) { |
|
case TEST_KMOD_DRIVER: |
|
kfree_const(config->test_driver); |
|
config->test_driver = NULL; |
|
copied = config_copy_test_driver_name(config, test_str, |
|
strlen(test_str)); |
|
break; |
|
case TEST_KMOD_FS_TYPE: |
|
kfree_const(config->test_fs); |
|
config->test_fs = NULL; |
|
copied = config_copy_test_fs(config, test_str, |
|
strlen(test_str)); |
|
break; |
|
default: |
|
mutex_unlock(&test_dev->config_mutex); |
|
return -EINVAL; |
|
} |
|
|
|
config->test_case = test_case; |
|
|
|
mutex_unlock(&test_dev->config_mutex); |
|
|
|
if (copied <= 0 || copied != strlen(test_str)) { |
|
test_dev->test_is_oom = true; |
|
return -ENOMEM; |
|
} |
|
|
|
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_limit |
|
static unsigned int kmod_init_test_thread_limit(void) |
|
{ |
|
return get_kmod_umh_limit(); |
|
} |
|
#else |
|
static 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; |
|
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; |
|
|
|
copied = config_copy_test_fs(config, TEST_START_TEST_FS, |
|
strlen(TEST_START_TEST_FS)); |
|
if (copied != strlen(TEST_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); |
|
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, "tun"); |
|
if (WARN_ON(ret)) |
|
return ret; |
|
ret = trigger_config_run_type(test_dev, |
|
TEST_KMOD_FS_TYPE, "btrfs"); |
|
if (WARN_ON(ret)) |
|
return ret; |
|
} |
|
|
|
return 0; |
|
} |
|
late_initcall(test_kmod_init); |
|
|
|
static |
|
void unregister_test_dev_kmod(struct kmod_test_device *test_dev) |
|
{ |
|
mutex_lock(&test_dev->trigger_mutex); |
|
mutex_lock(&test_dev->config_mutex); |
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|
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test_dev_kmod_stop_tests(test_dev); |
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|
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dev_info(test_dev->dev, "removing interface\n"); |
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misc_deregister(&test_dev->misc_dev); |
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|
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mutex_unlock(&test_dev->config_mutex); |
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mutex_unlock(&test_dev->trigger_mutex); |
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|
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free_test_dev_kmod(test_dev); |
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} |
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|
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static void __exit test_kmod_exit(void) |
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{ |
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struct kmod_test_device *test_dev, *tmp; |
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|
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mutex_lock(®_dev_mutex); |
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list_for_each_entry_safe(test_dev, tmp, ®_test_devs, list) { |
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list_del(&test_dev->list); |
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unregister_test_dev_kmod(test_dev); |
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} |
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mutex_unlock(®_dev_mutex); |
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} |
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module_exit(test_kmod_exit); |
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|
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MODULE_AUTHOR("Luis R. Rodriguez <[email protected]>"); |
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MODULE_LICENSE("GPL");
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