1239 lines
30 KiB
C
1239 lines
30 KiB
C
/*
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* kmod stress test driver
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*
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* Copyright (C) 2017 Luis R. Rodriguez <mcgrof@kernel.org>
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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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/*
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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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/**
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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,
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TEST_KMOD_DRIVER,
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TEST_KMOD_FS_TYPE,
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__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;
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/**
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* 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;
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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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};
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/**
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* kmod_test_device - test device to help test kmod
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*
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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
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* @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
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* @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
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* @info: array of info for each thread
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*/
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struct kmod_test_device {
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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;
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struct mutex config_mutex;
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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;
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struct completion kthreads_done;
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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)
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{
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switch (test_case) {
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case TEST_KMOD_DRIVER:
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return "TEST_KMOD_DRIVER";
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case TEST_KMOD_FS_TYPE:
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return "TEST_KMOD_FS_TYPE";
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default:
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return "invalid";
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}
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}
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static struct miscdevice *dev_to_misc_dev(struct device *dev)
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{
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return dev_get_drvdata(dev);
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}
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static struct kmod_test_device *misc_dev_to_test_dev(struct miscdevice *misc_dev)
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{
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return container_of(misc_dev, struct kmod_test_device, misc_dev);
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}
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static struct kmod_test_device *dev_to_test_dev(struct device *dev)
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{
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struct miscdevice *misc_dev;
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misc_dev = dev_to_misc_dev(dev);
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return misc_dev_to_test_dev(misc_dev);
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}
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/* Must run with thread_mutex held */
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static void kmod_test_done_check(struct kmod_test_device *test_dev,
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unsigned int idx)
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{
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struct test_config *config = &test_dev->config;
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test_dev->done++;
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dev_dbg(test_dev->dev, "Done thread count: %u\n", test_dev->done);
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if (test_dev->done == config->num_threads) {
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dev_info(test_dev->dev, "Done: %u threads have all run now\n",
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test_dev->done);
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dev_info(test_dev->dev, "Last thread to run: %u\n", idx);
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complete(&test_dev->kthreads_done);
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}
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}
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static void test_kmod_put_module(struct kmod_test_device_info *info)
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{
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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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if (!info->need_mod_put)
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return;
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switch (config->test_case) {
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case TEST_KMOD_DRIVER:
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break;
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case TEST_KMOD_FS_TYPE:
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if (info && info->fs_sync && info->fs_sync->owner)
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module_put(info->fs_sync->owner);
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break;
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default:
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BUG();
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}
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info->need_mod_put = true;
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}
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static int run_request(void *data)
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{
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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);
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break;
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case TEST_KMOD_FS_TYPE:
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info->fs_sync = get_fs_type(config->test_fs);
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info->need_mod_put = true;
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break;
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default:
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/* __trigger_config_run() already checked for test sanity */
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BUG();
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return -EINVAL;
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}
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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);
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mutex_unlock(&test_dev->thread_mutex);
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return 0;
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}
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static int tally_work_test(struct kmod_test_device_info *info)
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{
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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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int err_ret = 0;
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switch (config->test_case) {
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case TEST_KMOD_DRIVER:
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/*
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* Only capture errors, if one is found that's
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* enough, for now.
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*/
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if (info->ret_sync != 0)
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err_ret = info->ret_sync;
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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)
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err_ret = -EINVAL;
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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:
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BUG();
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}
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return err_ret;
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}
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/*
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* XXX: add result option to display if all errors did not match.
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* For now we just keep any error code if one was found.
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*
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* 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.
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*/
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static void tally_up_work(struct kmod_test_device *test_dev)
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{
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struct test_config *config = &test_dev->config;
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struct kmod_test_device_info *info;
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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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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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}
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/*
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* Note: request_module() returns 256 for a module not found even
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* 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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}
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static int try_one_request(struct kmod_test_device *test_dev, unsigned int idx)
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{
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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);
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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",
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KBUILD_MODNAME, idx);
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if (!info->task_sync || IS_ERR(info->task_sync)) {
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test_dev->test_is_oom = true;
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dev_err(test_dev->dev, "Setting up thread %u failed\n", idx);
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info->task_sync = NULL;
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goto err_out;
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} else
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dev_dbg(test_dev->dev, "Kicked off thread %u\n", idx);
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mutex_unlock(&test_dev->thread_mutex);
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return 0;
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err_out:
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info->ret_sync = fail_ret;
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mutex_unlock(&test_dev->thread_mutex);
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return fail_ret;
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}
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static void test_dev_kmod_stop_tests(struct kmod_test_device *test_dev)
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{
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struct test_config *config = &test_dev->config;
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struct kmod_test_device_info *info;
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unsigned int i;
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dev_info(test_dev->dev, "Ending request_module() tests\n");
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mutex_lock(&test_dev->thread_mutex);
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for (i=0; i < config->num_threads; i++) {
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info = &test_dev->info[i];
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if (info->task_sync && !IS_ERR(info->task_sync)) {
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dev_info(test_dev->dev,
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"Stopping still-running thread %i\n", i);
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kthread_stop(info->task_sync);
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}
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/*
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* info->task_sync is well protected, it can only be
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* NULL or a pointer to a struct. If its NULL we either
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* never ran, or we did and we completed the work. Completed
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* tasks *always* put the module for us. This is a sanity
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* check -- just in case.
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*/
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if (info->task_sync && info->need_mod_put)
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test_kmod_put_module(info);
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}
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mutex_unlock(&test_dev->thread_mutex);
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}
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/*
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* Only wait *iff* we did not run into any errors during all of our thread
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* set up. If run into any issues we stop threads and just bail out with
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* an error to the trigger. This also means we don't need any tally work
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* for any threads which fail.
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*/
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static int try_requests(struct kmod_test_device *test_dev)
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{
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struct test_config *config = &test_dev->config;
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unsigned int idx;
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int ret;
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bool any_error = false;
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for (idx=0; idx < config->num_threads; idx++) {
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if (test_dev->test_is_oom) {
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any_error = true;
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break;
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}
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ret = try_one_request(test_dev, idx);
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if (ret) {
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any_error = true;
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break;
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}
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}
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if (!any_error) {
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test_dev->test_is_oom = false;
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dev_info(test_dev->dev,
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"No errors were found while initializing threads\n");
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wait_for_completion(&test_dev->kthreads_done);
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tally_up_work(test_dev);
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} else {
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test_dev->test_is_oom = true;
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dev_info(test_dev->dev,
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"At least one thread failed to start, stop all work\n");
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test_dev_kmod_stop_tests(test_dev);
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return -ENOMEM;
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}
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return 0;
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}
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static int run_test_driver(struct kmod_test_device *test_dev)
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{
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struct test_config *config = &test_dev->config;
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dev_info(test_dev->dev, "Test case: %s (%u)\n",
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test_case_str(config->test_case),
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config->test_case);
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dev_info(test_dev->dev, "Test driver to load: %s\n",
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config->test_driver);
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dev_info(test_dev->dev, "Number of threads to run: %u\n",
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config->num_threads);
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dev_info(test_dev->dev, "Thread IDs will range from 0 - %u\n",
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config->num_threads - 1);
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return try_requests(test_dev);
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}
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static int run_test_fs_type(struct kmod_test_device *test_dev)
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{
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struct test_config *config = &test_dev->config;
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dev_info(test_dev->dev, "Test case: %s (%u)\n",
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test_case_str(config->test_case),
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config->test_case);
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dev_info(test_dev->dev, "Test filesystem to load: %s\n",
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config->test_fs);
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dev_info(test_dev->dev, "Number of threads to run: %u\n",
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config->num_threads);
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dev_info(test_dev->dev, "Thread IDs will range from 0 - %u\n",
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config->num_threads - 1);
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return try_requests(test_dev);
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}
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|
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static ssize_t config_show(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct kmod_test_device *test_dev = dev_to_test_dev(dev);
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struct test_config *config = &test_dev->config;
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int len = 0;
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mutex_lock(&test_dev->config_mutex);
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|
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len += snprintf(buf, PAGE_SIZE,
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"Custom trigger configuration for: %s\n",
|
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dev_name(dev));
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|
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len += snprintf(buf+len, PAGE_SIZE - len,
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"Number of threads:\t%u\n",
|
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config->num_threads);
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len += snprintf(buf+len, PAGE_SIZE - len,
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"Test_case:\t%s (%u)\n",
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test_case_str(config->test_case),
|
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config->test_case);
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|
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if (config->test_driver)
|
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len += snprintf(buf+len, PAGE_SIZE - len,
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"driver:\t%s\n",
|
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config->test_driver);
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else
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len += snprintf(buf+len, PAGE_SIZE - len,
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"driver:\tEMPTY\n");
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|
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if (config->test_fs)
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len += snprintf(buf+len, PAGE_SIZE - len,
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"fs:\t%s\n",
|
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config->test_fs);
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else
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len += snprintf(buf+len, PAGE_SIZE - len,
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"fs:\tEMPTY\n");
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|
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mutex_unlock(&test_dev->config_mutex);
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|
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return len;
|
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}
|
|
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)
|
|
{
|
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struct test_config *config = &test_dev->config;
|
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|
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test_dev->done = 0;
|
|
|
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switch (config->test_case) {
|
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case TEST_KMOD_DRIVER:
|
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return run_test_driver(test_dev);
|
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case TEST_KMOD_FS_TYPE:
|
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return run_test_fs_type(test_dev);
|
|
default:
|
|
dev_warn(test_dev->dev,
|
|
"Invalid test case requested: %u\n",
|
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config->test_case);
|
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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_driver = 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_driver = 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(config->num_threads *
|
|
sizeof(struct kmod_test_device_info));
|
|
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 long new;
|
|
unsigned int old_val;
|
|
|
|
ret = kstrtoul(buf, 10, &new);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (new > UINT_MAX)
|
|
return -EINVAL;
|
|
|
|
mutex_lock(&test_dev->config_mutex);
|
|
|
|
old_val = *config;
|
|
*(unsigned int *)config = new;
|
|
|
|
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)
|
|
{
|
|
int ret;
|
|
unsigned long new;
|
|
|
|
ret = kstrtoul(buf, 10, &new);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (new < min || new > max)
|
|
return -EINVAL;
|
|
|
|
mutex_lock(&test_dev->config_mutex);
|
|
*config = new;
|
|
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 ret;
|
|
long new;
|
|
|
|
ret = kstrtol(buf, 10, &new);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (new < INT_MIN || new > INT_MAX)
|
|
return -EINVAL;
|
|
|
|
mutex_lock(&test_dev->config_mutex);
|
|
*config = new;
|
|
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);
|
|
|
|
test_dev_kmod_stop_tests(test_dev);
|
|
|
|
dev_info(test_dev->dev, "removing interface\n");
|
|
misc_deregister(&test_dev->misc_dev);
|
|
kfree(&test_dev->misc_dev.name);
|
|
|
|
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_LICENSE("GPL");
|