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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (c) 2020, Oracle and/or its affiliates.
* Author: Alan Maguire <alan.maguire@oracle.com>
*/
#include <linux/debugfs.h>
#include <linux/module.h>
#include <kunit/test.h>
#include <kunit/test-bug.h>
#include "string-stream.h"
#include "debugfs.h"
#define KUNIT_DEBUGFS_ROOT "kunit"
#define KUNIT_DEBUGFS_RESULTS "results"
#define KUNIT_DEBUGFS_RUN "run"
/*
* Create a debugfs representation of test suites:
*
* Path Semantics
* /sys/kernel/debug/kunit/<testsuite>/results Show results of last run for
* testsuite
* /sys/kernel/debug/kunit/<testsuite>/run Write to this file to trigger
* testsuite to run
*
*/
static struct dentry *debugfs_rootdir;
void kunit_debugfs_cleanup(void)
{
debugfs_remove_recursive(debugfs_rootdir);
}
void kunit_debugfs_init(void)
{
if (!debugfs_rootdir)
debugfs_rootdir = debugfs_create_dir(KUNIT_DEBUGFS_ROOT, NULL);
}
static void debugfs_print_result(struct seq_file *seq, struct string_stream *log)
{
struct string_stream_fragment *frag_container;
if (!log)
return;
/*
* Walk the fragments so we don't need to allocate a temporary
* buffer to hold the entire string.
*/
spin_lock(&log->lock);
list_for_each_entry(frag_container, &log->fragments, node)
seq_printf(seq, "%s", frag_container->fragment);
spin_unlock(&log->lock);
}
/*
* /sys/kernel/debug/kunit/<testsuite>/results shows all results for testsuite.
*/
static int debugfs_print_results(struct seq_file *seq, void *v)
{
struct kunit_suite *suite = (struct kunit_suite *)seq->private;
enum kunit_status success;
struct kunit_case *test_case;
if (!suite)
return 0;
success = kunit_suite_has_succeeded(suite);
/* Print KTAP header so the debugfs log can be parsed as valid KTAP. */
seq_puts(seq, "KTAP version 1\n");
seq_puts(seq, "1..1\n");
/* Print suite header because it is not stored in the test logs. */
seq_puts(seq, KUNIT_SUBTEST_INDENT "KTAP version 1\n");
seq_printf(seq, KUNIT_SUBTEST_INDENT "# Subtest: %s\n", suite->name);
seq_printf(seq, KUNIT_SUBTEST_INDENT "1..%zd\n", kunit_suite_num_test_cases(suite));
kunit_suite_for_each_test_case(suite, test_case)
debugfs_print_result(seq, test_case->log);
debugfs_print_result(seq, suite->log);
seq_printf(seq, "%s %d %s\n",
kunit_status_to_ok_not_ok(success), 1, suite->name);
return 0;
}
static int debugfs_release(struct inode *inode, struct file *file)
{
return single_release(inode, file);
}
static int debugfs_results_open(struct inode *inode, struct file *file)
{
struct kunit_suite *suite;
suite = (struct kunit_suite *)inode->i_private;
return single_open(file, debugfs_print_results, suite);
}
/*
* Print a usage message to the debugfs "run" file
* (/sys/kernel/debug/kunit/<testsuite>/run) if opened.
*/
static int debugfs_print_run(struct seq_file *seq, void *v)
{
struct kunit_suite *suite = (struct kunit_suite *)seq->private;
seq_puts(seq, "Write to this file to trigger the test suite to run.\n");
seq_printf(seq, "usage: echo \"any string\" > /sys/kernel/debugfs/kunit/%s/run\n",
suite->name);
return 0;
}
/*
* The debugfs "run" file (/sys/kernel/debug/kunit/<testsuite>/run)
* contains no information. Write to the file to trigger the test suite
* to run.
*/
static int debugfs_run_open(struct inode *inode, struct file *file)
{
struct kunit_suite *suite;
suite = (struct kunit_suite *)inode->i_private;
return single_open(file, debugfs_print_run, suite);
}
/*
* Trigger a test suite to run by writing to the suite's "run" debugfs
* file found at: /sys/kernel/debug/kunit/<testsuite>/run
*
* Note: what is written to this file will not be saved.
*/
static ssize_t debugfs_run(struct file *file,
const char __user *buf, size_t count, loff_t *ppos)
{
struct inode *f_inode = file->f_inode;
struct kunit_suite *suite = (struct kunit_suite *) f_inode->i_private;
__kunit_test_suites_init(&suite, 1);
return count;
}
static const struct file_operations debugfs_results_fops = {
.open = debugfs_results_open,
.read = seq_read,
.llseek = seq_lseek,
.release = debugfs_release,
};
static const struct file_operations debugfs_run_fops = {
.open = debugfs_run_open,
.read = seq_read,
.write = debugfs_run,
.llseek = seq_lseek,
.release = debugfs_release,
};
void kunit_debugfs_create_suite(struct kunit_suite *suite)
{
struct kunit_case *test_case;
struct string_stream *stream;
/* If suite log already allocated, do not create new debugfs files. */
if (suite->log)
return;
/*
* Allocate logs before creating debugfs representation.
* The suite->log and test_case->log pointer are expected to be NULL
* if there isn't a log, so only set it if the log stream was created
* successfully.
*/
stream = alloc_string_stream(GFP_KERNEL);
if (IS_ERR_OR_NULL(stream))
return;
string_stream_set_append_newlines(stream, true);
suite->log = stream;
kunit_suite_for_each_test_case(suite, test_case) {
stream = alloc_string_stream(GFP_KERNEL);
if (IS_ERR_OR_NULL(stream))
goto err;
string_stream_set_append_newlines(stream, true);
test_case->log = stream;
}
suite->debugfs = debugfs_create_dir(suite->name, debugfs_rootdir);
debugfs_create_file(KUNIT_DEBUGFS_RESULTS, S_IFREG | 0444,
suite->debugfs,
suite, &debugfs_results_fops);
/* Do not create file to re-run test if test runs on init */
if (!suite->is_init) {
debugfs_create_file(KUNIT_DEBUGFS_RUN, S_IFREG | 0644,
suite->debugfs,
suite, &debugfs_run_fops);
}
return;
err:
string_stream_destroy(suite->log);
kunit_suite_for_each_test_case(suite, test_case)
string_stream_destroy(test_case->log);
}
void kunit_debugfs_destroy_suite(struct kunit_suite *suite)
{
struct kunit_case *test_case;
debugfs_remove_recursive(suite->debugfs);
string_stream_destroy(suite->log);
kunit_suite_for_each_test_case(suite, test_case)
string_stream_destroy(test_case->log);
}
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