lib/kunit/debugfs.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (c) 2020, Oracle and/or its affiliates.
   4  *    Author: Alan Maguire <alan.maguire@oracle.com>
   5  */
   6
   7 #include <linux/debugfs.h>
   8 #include <linux/module.h>
   9
  10 #include <kunit/test.h>
  11
  12 #include "string-stream.h"
  13
  14 #define KUNIT_DEBUGFS_ROOT             "kunit"
  15 #define KUNIT_DEBUGFS_RESULTS          "results"
  16
  17 /*
  18  * Create a debugfs representation of test suites:
  19  *
  20  * Path                                         Semantics
  21  * /sys/kernel/debug/kunit/<testsuite>/results  Show results of last run for
  22  *                                              testsuite
  23  *
  24  */
  25
  26 static struct dentry *debugfs_rootdir;
  27
  28 void kunit_debugfs_cleanup(void)
  29 {
  30         debugfs_remove_recursive(debugfs_rootdir);
  31 }
  32
  33 void kunit_debugfs_init(void)
  34 {
  35         if (!debugfs_rootdir)
  36                 debugfs_rootdir = debugfs_create_dir(KUNIT_DEBUGFS_ROOT, NULL);
  37 }
  38
  39 static void debugfs_print_result(struct seq_file *seq,
  40                                  struct kunit_suite *suite,
  41                                  struct kunit_case *test_case)
  42 {
  43         if (!test_case || !test_case->log)
  44                 return;
  45
  46         seq_printf(seq, "%s", test_case->log);
  47 }
  48
  49 /*
  50  * /sys/kernel/debug/kunit/<testsuite>/results shows all results for testsuite.
  51  */
  52 static int debugfs_print_results(struct seq_file *seq, void *v)
  53 {
  54         struct kunit_suite *suite = (struct kunit_suite *)seq->private;
  55         bool success = kunit_suite_has_succeeded(suite);
  56         struct kunit_case *test_case;
  57
  58         if (!suite || !suite->log)
  59                 return 0;
  60
  61         seq_printf(seq, "%s", suite->log);
  62
  63         kunit_suite_for_each_test_case(suite, test_case)
  64                 debugfs_print_result(seq, suite, test_case);
  65
  66         seq_printf(seq, "%s %d - %s\n",
  67                    kunit_status_to_string(success), 1, suite->name);
  68         return 0;
  69 }
  70
  71 static int debugfs_release(struct inode *inode, struct file *file)
  72 {
  73         return single_release(inode, file);
  74 }
  75
  76 static int debugfs_results_open(struct inode *inode, struct file *file)
  77 {
  78         struct kunit_suite *suite;
  79
  80         suite = (struct kunit_suite *)inode->i_private;
  81
  82         return single_open(file, debugfs_print_results, suite);
  83 }
  84
  85 static const struct file_operations debugfs_results_fops = {
  86         .open = debugfs_results_open,
  87         .read = seq_read,
  88         .llseek = seq_lseek,
  89         .release = debugfs_release,
  90 };
  91
  92 void kunit_debugfs_create_suite(struct kunit_suite *suite)
  93 {
  94         struct kunit_case *test_case;
  95
  96         /* Allocate logs before creating debugfs representation. */
  97         suite->log = kzalloc(KUNIT_LOG_SIZE, GFP_KERNEL);
  98         kunit_suite_for_each_test_case(suite, test_case)
  99                 test_case->log = kzalloc(KUNIT_LOG_SIZE, GFP_KERNEL);
 100
 101         suite->debugfs = debugfs_create_dir(suite->name, debugfs_rootdir);
 102
 103         debugfs_create_file(KUNIT_DEBUGFS_RESULTS, S_IFREG | 0444,
 104                             suite->debugfs,
 105                             suite, &debugfs_results_fops);
 106 }
 107
 108 void kunit_debugfs_destroy_suite(struct kunit_suite *suite)
 109 {
 110         struct kunit_case *test_case;
 111
 112         debugfs_remove_recursive(suite->debugfs);
 113         kfree(suite->log);
 114         kunit_suite_for_each_test_case(suite, test_case)
 115                 kfree(test_case->log);
 116 }