1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * KUnit API to save and access test attributes
4 *
5 * Copyright (C) 2023, Google LLC.
6 * Author: Rae Moar <rmoar@google.com>
7 */
8
9 #include <kunit/test.h>
10 #include <kunit/attributes.h>
11
12 /* Options for printing attributes:
13 * PRINT_ALWAYS - attribute is printed for every test case and suite if set
14 * PRINT_SUITE - attribute is printed for every suite if set but not for test cases
15 * PRINT_NEVER - attribute is never printed
16 */
17 enum print_ops {
18 PRINT_ALWAYS,
19 PRINT_SUITE,
20 PRINT_NEVER,
21 };
22
23 /**
24 * struct kunit_attr - represents a test attribute and holds flexible
25 * helper functions to interact with attribute.
26 *
27 * @name: name of test attribute, eg. speed
28 * @get_attr: function to return attribute value given a test
29 * @to_string: function to return string representation of given
30 * attribute value
31 * @filter: function to indicate whether a given attribute value passes a
32 * filter
33 * @attr_default: default attribute value used during filtering
34 * @print: value of enum print_ops to indicate when to print attribute
35 */
36 struct kunit_attr {
37 const char *name;
38 void *(*get_attr)(void *test_or_suite, bool is_test);
39 const char *(*to_string)(void *attr, bool *to_free);
40 int (*filter)(void *attr, const char *input, int *err);
41 void *attr_default;
42 enum print_ops print;
43 };
44
45 /* String Lists for enum Attributes */
46
47 static const char * const speed_str_list[] = {"unset", "very_slow", "slow", "normal"};
48
49 /* To String Methods */
50
attr_enum_to_string(void * attr,const char * const str_list[],bool * to_free)51 static const char *attr_enum_to_string(void *attr, const char * const str_list[], bool *to_free)
52 {
53 long val = (long)attr;
54
55 *to_free = false;
56 if (!val)
57 return NULL;
58 return str_list[val];
59 }
60
attr_bool_to_string(void * attr,bool * to_free)61 static const char *attr_bool_to_string(void *attr, bool *to_free)
62 {
63 bool val = (bool)attr;
64
65 *to_free = false;
66 if (val)
67 return "true";
68 return "false";
69 }
70
attr_speed_to_string(void * attr,bool * to_free)71 static const char *attr_speed_to_string(void *attr, bool *to_free)
72 {
73 return attr_enum_to_string(attr, speed_str_list, to_free);
74 }
75
attr_string_to_string(void * attr,bool * to_free)76 static const char *attr_string_to_string(void *attr, bool *to_free)
77 {
78 *to_free = false;
79 return (char *) attr;
80 }
81
82 /* Filter Methods */
83
84 static const char op_list[] = "<>!=";
85
86 /*
87 * Returns whether the inputted integer value matches the filter given
88 * by the operation string and inputted integer.
89 */
int_filter(long val,const char * op,int input,int * err)90 static int int_filter(long val, const char *op, int input, int *err)
91 {
92 if (!strncmp(op, "<=", 2))
93 return (val <= input);
94 else if (!strncmp(op, ">=", 2))
95 return (val >= input);
96 else if (!strncmp(op, "!=", 2))
97 return (val != input);
98 else if (!strncmp(op, ">", 1))
99 return (val > input);
100 else if (!strncmp(op, "<", 1))
101 return (val < input);
102 else if (!strncmp(op, "=", 1))
103 return (val == input);
104 *err = -EINVAL;
105 pr_err("kunit executor: invalid filter operation: %s\n", op);
106 return false;
107 }
108
109 /*
110 * Returns whether the inputted enum value "attr" matches the filter given
111 * by the input string. Note: the str_list includes the corresponding string
112 * list to the enum values.
113 */
attr_enum_filter(void * attr,const char * input,int * err,const char * const str_list[],int max)114 static int attr_enum_filter(void *attr, const char *input, int *err,
115 const char * const str_list[], int max)
116 {
117 int i, j, input_int = -1;
118 long test_val = (long)attr;
119 const char *input_val = NULL;
120
121 for (i = 0; input[i]; i++) {
122 if (!strchr(op_list, input[i])) {
123 input_val = input + i;
124 break;
125 }
126 }
127
128 if (!input_val) {
129 *err = -EINVAL;
130 pr_err("kunit executor: filter value not found: %s\n", input);
131 return false;
132 }
133
134 for (j = 0; j <= max; j++) {
135 if (!strcmp(input_val, str_list[j]))
136 input_int = j;
137 }
138
139 if (input_int < 0) {
140 *err = -EINVAL;
141 pr_err("kunit executor: invalid filter input: %s\n", input);
142 return false;
143 }
144
145 return int_filter(test_val, input, input_int, err);
146 }
147
attr_speed_filter(void * attr,const char * input,int * err)148 static int attr_speed_filter(void *attr, const char *input, int *err)
149 {
150 return attr_enum_filter(attr, input, err, speed_str_list, KUNIT_SPEED_MAX);
151 }
152
153 /*
154 * Returns whether the inputted string value (attr) matches the filter given
155 * by the input string.
156 */
attr_string_filter(void * attr,const char * input,int * err)157 static int attr_string_filter(void *attr, const char *input, int *err)
158 {
159 char *str = attr;
160
161 if (!strncmp(input, "<", 1)) {
162 *err = -EINVAL;
163 pr_err("kunit executor: invalid filter input: %s\n", input);
164 return false;
165 } else if (!strncmp(input, ">", 1)) {
166 *err = -EINVAL;
167 pr_err("kunit executor: invalid filter input: %s\n", input);
168 return false;
169 } else if (!strncmp(input, "!=", 2)) {
170 return (strcmp(input + 2, str) != 0);
171 } else if (!strncmp(input, "=", 1)) {
172 return (strcmp(input + 1, str) == 0);
173 }
174 *err = -EINVAL;
175 pr_err("kunit executor: invalid filter operation: %s\n", input);
176 return false;
177 }
178
attr_bool_filter(void * attr,const char * input,int * err)179 static int attr_bool_filter(void *attr, const char *input, int *err)
180 {
181 int i, input_int = -1;
182 long val = (long)attr;
183 const char *input_str = NULL;
184
185 for (i = 0; input[i]; i++) {
186 if (!strchr(op_list, input[i])) {
187 input_str = input + i;
188 break;
189 }
190 }
191
192 if (!input_str) {
193 *err = -EINVAL;
194 pr_err("kunit executor: filter value not found: %s\n", input);
195 return false;
196 }
197
198 if (!strcmp(input_str, "true"))
199 input_int = (int)true;
200 else if (!strcmp(input_str, "false"))
201 input_int = (int)false;
202 else {
203 *err = -EINVAL;
204 pr_err("kunit executor: invalid filter input: %s\n", input);
205 return false;
206 }
207
208 return int_filter(val, input, input_int, err);
209 }
210
211 /* Get Attribute Methods */
212
attr_speed_get(void * test_or_suite,bool is_test)213 static void *attr_speed_get(void *test_or_suite, bool is_test)
214 {
215 struct kunit_suite *suite = is_test ? NULL : test_or_suite;
216 struct kunit_case *test = is_test ? test_or_suite : NULL;
217
218 if (test)
219 return ((void *) test->attr.speed);
220 else
221 return ((void *) suite->attr.speed);
222 }
223
attr_module_get(void * test_or_suite,bool is_test)224 static void *attr_module_get(void *test_or_suite, bool is_test)
225 {
226 struct kunit_suite *suite = is_test ? NULL : test_or_suite;
227 struct kunit_case *test = is_test ? test_or_suite : NULL;
228
229 // Suites get their module attribute from their first test_case
230 if (test)
231 return ((void *) test->module_name);
232 else if (kunit_suite_num_test_cases(suite) > 0)
233 return ((void *) suite->test_cases[0].module_name);
234 else
235 return (void *) "";
236 }
237
attr_is_init_get(void * test_or_suite,bool is_test)238 static void *attr_is_init_get(void *test_or_suite, bool is_test)
239 {
240 struct kunit_suite *suite = is_test ? NULL : test_or_suite;
241 struct kunit_case *test = is_test ? test_or_suite : NULL;
242
243 if (test)
244 return ((void *) NULL);
245 else
246 return ((void *) suite->is_init);
247 }
248
249 /* List of all Test Attributes */
250
251 static struct kunit_attr kunit_attr_list[] = {
252 {
253 .name = "speed",
254 .get_attr = attr_speed_get,
255 .to_string = attr_speed_to_string,
256 .filter = attr_speed_filter,
257 .attr_default = (void *)KUNIT_SPEED_NORMAL,
258 .print = PRINT_ALWAYS,
259 },
260 {
261 .name = "module",
262 .get_attr = attr_module_get,
263 .to_string = attr_string_to_string,
264 .filter = attr_string_filter,
265 .attr_default = (void *)"",
266 .print = PRINT_SUITE,
267 },
268 {
269 .name = "is_init",
270 .get_attr = attr_is_init_get,
271 .to_string = attr_bool_to_string,
272 .filter = attr_bool_filter,
273 .attr_default = (void *)false,
274 .print = PRINT_SUITE,
275 }
276 };
277
278 /* Helper Functions to Access Attributes */
279
kunit_attr_filter_name(struct kunit_attr_filter filter)280 const char *kunit_attr_filter_name(struct kunit_attr_filter filter)
281 {
282 return filter.attr->name;
283 }
284
kunit_print_attr(void * test_or_suite,bool is_test,unsigned int test_level)285 void kunit_print_attr(void *test_or_suite, bool is_test, unsigned int test_level)
286 {
287 int i;
288 bool to_free = false;
289 void *attr;
290 const char *attr_name, *attr_str;
291 struct kunit_suite *suite = is_test ? NULL : test_or_suite;
292 struct kunit_case *test = is_test ? test_or_suite : NULL;
293
294 for (i = 0; i < ARRAY_SIZE(kunit_attr_list); i++) {
295 if (kunit_attr_list[i].print == PRINT_NEVER ||
296 (test && kunit_attr_list[i].print == PRINT_SUITE))
297 continue;
298 attr = kunit_attr_list[i].get_attr(test_or_suite, is_test);
299 if (attr) {
300 attr_name = kunit_attr_list[i].name;
301 attr_str = kunit_attr_list[i].to_string(attr, &to_free);
302 if (test) {
303 kunit_log(KERN_INFO, test, "%*s# %s.%s: %s",
304 KUNIT_INDENT_LEN * test_level, "", test->name,
305 attr_name, attr_str);
306 } else {
307 kunit_log(KERN_INFO, suite, "%*s# %s: %s",
308 KUNIT_INDENT_LEN * test_level, "", attr_name, attr_str);
309 }
310
311 /* Free to_string of attribute if needed */
312 if (to_free)
313 kfree(attr_str);
314 }
315 }
316 }
317
318 /* Helper Functions to Filter Attributes */
319
kunit_get_filter_count(char * input)320 int kunit_get_filter_count(char *input)
321 {
322 int i, comma_index = 0, count = 0;
323
324 for (i = 0; input[i]; i++) {
325 if (input[i] == ',') {
326 if ((i - comma_index) > 1)
327 count++;
328 comma_index = i;
329 }
330 }
331 if ((i - comma_index) > 0)
332 count++;
333 return count;
334 }
335
kunit_next_attr_filter(char ** filters,int * err)336 struct kunit_attr_filter kunit_next_attr_filter(char **filters, int *err)
337 {
338 struct kunit_attr_filter filter = {};
339 int i, j, comma_index = 0, new_start_index = 0;
340 int op_index = -1, attr_index = -1;
341 char op;
342 char *input = *filters;
343
344 /* Parse input until operation */
345 for (i = 0; input[i]; i++) {
346 if (op_index < 0 && strchr(op_list, input[i])) {
347 op_index = i;
348 } else if (!comma_index && input[i] == ',') {
349 comma_index = i;
350 } else if (comma_index && input[i] != ' ') {
351 new_start_index = i;
352 break;
353 }
354 }
355
356 if (op_index <= 0) {
357 *err = -EINVAL;
358 pr_err("kunit executor: filter operation not found: %s\n", input);
359 return filter;
360 }
361
362 /* Temporarily set operator to \0 character. */
363 op = input[op_index];
364 input[op_index] = '\0';
365
366 /* Find associated kunit_attr object */
367 for (j = 0; j < ARRAY_SIZE(kunit_attr_list); j++) {
368 if (!strcmp(input, kunit_attr_list[j].name)) {
369 attr_index = j;
370 break;
371 }
372 }
373
374 input[op_index] = op;
375
376 if (attr_index < 0) {
377 *err = -EINVAL;
378 pr_err("kunit executor: attribute not found: %s\n", input);
379 } else {
380 filter.attr = &kunit_attr_list[attr_index];
381 }
382
383 if (comma_index > 0) {
384 input[comma_index] = '\0';
385 filter.input = input + op_index;
386 input = input + new_start_index;
387 } else {
388 filter.input = input + op_index;
389 input = NULL;
390 }
391
392 *filters = input;
393
394 return filter;
395 }
396
kunit_filter_attr_tests(const struct kunit_suite * const suite,struct kunit_attr_filter filter,char * action,int * err)397 struct kunit_suite *kunit_filter_attr_tests(const struct kunit_suite *const suite,
398 struct kunit_attr_filter filter, char *action, int *err)
399 {
400 int n = 0;
401 struct kunit_case *filtered, *test_case;
402 struct kunit_suite *copy;
403 void *suite_val, *test_val;
404 bool suite_result, test_result, default_result, result;
405
406 /* Allocate memory for new copy of suite and list of test cases */
407 copy = kmemdup(suite, sizeof(*copy), GFP_KERNEL);
408 if (!copy)
409 return ERR_PTR(-ENOMEM);
410
411 kunit_suite_for_each_test_case(suite, test_case) { n++; }
412
413 filtered = kcalloc(n + 1, sizeof(*filtered), GFP_KERNEL);
414 if (!filtered) {
415 kfree(copy);
416 return ERR_PTR(-ENOMEM);
417 }
418
419 n = 0;
420
421 /* Save filtering result on default value */
422 default_result = filter.attr->filter(filter.attr->attr_default, filter.input, err);
423 if (*err)
424 goto err;
425
426 /* Save suite attribute value and filtering result on that value */
427 suite_val = filter.attr->get_attr((void *)suite, false);
428 suite_result = filter.attr->filter(suite_val, filter.input, err);
429 if (*err)
430 goto err;
431
432 /* For each test case, save test case if passes filtering. */
433 kunit_suite_for_each_test_case(suite, test_case) {
434 test_val = filter.attr->get_attr((void *) test_case, true);
435 test_result = filter.attr->filter(filter.attr->get_attr(test_case, true),
436 filter.input, err);
437 if (*err)
438 goto err;
439
440 /*
441 * If attribute value of test case is set, filter on that value.
442 * If not, filter on suite value if set. If not, filter on
443 * default value.
444 */
445 result = false;
446 if (test_val) {
447 if (test_result)
448 result = true;
449 } else if (suite_val) {
450 if (suite_result)
451 result = true;
452 } else if (default_result) {
453 result = true;
454 }
455
456 if (result) {
457 filtered[n++] = *test_case;
458 } else if (action && strcmp(action, "skip") == 0) {
459 test_case->status = KUNIT_SKIPPED;
460 filtered[n++] = *test_case;
461 }
462 }
463
464 err:
465 if (n == 0 || *err) {
466 kfree(copy);
467 kfree(filtered);
468 return NULL;
469 }
470
471 copy->test_cases = filtered;
472
473 return copy;
474 }
475