// SPDX-License-Identifier: GPL-2.0
/*
* KUnit API to save and access test attributes
*
* Copyright (C) 2023, Google LLC.
* Author: Rae Moar <[email protected]>
*/
#include <kunit/test.h>
#include <kunit/attributes.h>
/* Options for printing attributes:
* PRINT_ALWAYS - attribute is printed for every test case and suite if set
* PRINT_SUITE - attribute is printed for every suite if set but not for test cases
* PRINT_NEVER - attribute is never printed
*/
enum print_ops {
PRINT_ALWAYS,
PRINT_SUITE,
PRINT_NEVER,
};
/**
* struct kunit_attr - represents a test attribute and holds flexible
* helper functions to interact with attribute.
*
* @name: name of test attribute, eg. speed
* @get_attr: function to return attribute value given a test
* @to_string: function to return string representation of given
* attribute value
* @filter: function to indicate whether a given attribute value passes a
* filter
* @attr_default: default attribute value used during filtering
* @print: value of enum print_ops to indicate when to print attribute
*/
struct kunit_attr {
const char *name;
void *(*get_attr)(void *test_or_suite, bool is_test);
const char *(*to_string)(void *attr, bool *to_free);
int (*filter)(void *attr, const char *input, int *err);
void *attr_default;
enum print_ops print;
};
/* String Lists for enum Attributes */
static const char * const speed_str_list[] = {"unset", "very_slow", "slow", "normal"};
/* To String Methods */
static const char *attr_enum_to_string(void *attr, const char * const str_list[], bool *to_free)
{
long val = (long)attr;
*to_free = false;
if (!val)
return NULL;
return str_list[val];
}
static const char *attr_bool_to_string(void *attr, bool *to_free)
{
bool val = (bool)attr;
*to_free = false;
if (val)
return "true";
return "false";
}
static const char *attr_speed_to_string(void *attr, bool *to_free)
{
return attr_enum_to_string(attr, speed_str_list, to_free);
}
static const char *attr_string_to_string(void *attr, bool *to_free)
{
*to_free = false;
return (char *) attr;
}
/* Filter Methods */
static const char op_list[] = "<>!=";
/*
* Returns whether the inputted integer value matches the filter given
* by the operation string and inputted integer.
*/
static int int_filter(long val, const char *op, int input, int *err)
{
if (!strncmp(op, "<=", 2))
return (val <= input);
else if (!strncmp(op, ">=", 2))
return (val >= input);
else if (!strncmp(op, "!=", 2))
return (val != input);
else if (!strncmp(op, ">", 1))
return (val > input);
else if (!strncmp(op, "<", 1))
return (val < input);
else if (!strncmp(op, "=", 1))
return (val == input);
*err = -EINVAL;
pr_err("kunit executor: invalid filter operation: %s\n", op);
return false;
}
/*
* Returns whether the inputted enum value "attr" matches the filter given
* by the input string. Note: the str_list includes the corresponding string
* list to the enum values.
*/
static int attr_enum_filter(void *attr, const char *input, int *err,
const char * const str_list[], int max)
{
int i, j, input_int = -1;
long test_val = (long)attr;
const char *input_val = NULL;
for (i = 0; input[i]; i++) {
if (!strchr(op_list, input[i])) {
input_val = input + i;
break;
}
}
if (!input_val) {
*err = -EINVAL;
pr_err("kunit executor: filter value not found: %s\n", input);
return false;
}
for (j = 0; j <= max; j++) {
if (!strcmp(input_val, str_list[j]))
input_int = j;
}
if (input_int < 0) {
*err = -EINVAL;
pr_err("kunit executor: invalid filter input: %s\n", input);
return false;
}
return int_filter(test_val, input, input_int, err);
}
static int attr_speed_filter(void *attr, const char *input, int *err)
{
return attr_enum_filter(attr, input, err, speed_str_list, KUNIT_SPEED_MAX);
}
/*
* Returns whether the inputted string value (attr) matches the filter given
* by the input string.
*/
static int attr_string_filter(void *attr, const char *input, int *err)
{
char *str = attr;
if (!strncmp(input, "<", 1)) {
*err = -EINVAL;
pr_err("kunit executor: invalid filter input: %s\n", input);
return false;
} else if (!strncmp(input, ">", 1)) {
*err = -EINVAL;
pr_err("kunit executor: invalid filter input: %s\n", input);
return false;
} else if (!strncmp(input, "!=", 2)) {
return (strcmp(input + 2, str) != 0);
} else if (!strncmp(input, "=", 1)) {
return (strcmp(input + 1, str) == 0);
}
*err = -EINVAL;
pr_err("kunit executor: invalid filter operation: %s\n", input);
return false;
}
static int attr_bool_filter(void *attr, const char *input, int *err)
{
int i, input_int = -1;
long val = (long)attr;
const char *input_str = NULL;
for (i = 0; input[i]; i++) {
if (!strchr(op_list, input[i])) {
input_str = input + i;
break;
}
}
if (!input_str) {
*err = -EINVAL;
pr_err("kunit executor: filter value not found: %s\n", input);
return false;
}
if (!strcmp(input_str, "true"))
input_int = (int)true;
else if (!strcmp(input_str, "false"))
input_int = (int)false;
else {
*err = -EINVAL;
pr_err("kunit executor: invalid filter input: %s\n", input);
return false;
}
return int_filter(val, input, input_int, err);
}
/* Get Attribute Methods */
static void *attr_speed_get(void *test_or_suite, bool is_test)
{
struct kunit_suite *suite = is_test ? NULL : test_or_suite;
struct kunit_case *test = is_test ? test_or_suite : NULL;
if (test)
return ((void *) test->attr.speed);
else
return ((void *) suite->attr.speed);
}
static void *attr_module_get(void *test_or_suite, bool is_test)
{
struct kunit_suite *suite = is_test ? NULL : test_or_suite;
struct kunit_case *test = is_test ? test_or_suite : NULL;
// Suites get their module attribute from their first test_case
if (test)
return ((void *) test->module_name);
else if (kunit_suite_num_test_cases(suite) > 0)
return ((void *) suite->test_cases[0].module_name);
else
return (void *) "";
}
static void *attr_is_init_get(void *test_or_suite, bool is_test)
{
struct kunit_suite *suite = is_test ? NULL : test_or_suite;
struct kunit_case *test = is_test ? test_or_suite : NULL;
if (test)
return ((void *) NULL);
else
return ((void *) suite->is_init);
}
/* List of all Test Attributes */
static struct kunit_attr kunit_attr_list[] = {
{
.name = "speed",
.get_attr = attr_speed_get,
.to_string = attr_speed_to_string,
.filter = attr_speed_filter,
.attr_default = (void *)KUNIT_SPEED_NORMAL,
.print = PRINT_ALWAYS,
},
{
.name = "module",
.get_attr = attr_module_get,
.to_string = attr_string_to_string,
.filter = attr_string_filter,
.attr_default = (void *)"",
.print = PRINT_SUITE,
},
{
.name = "is_init",
.get_attr = attr_is_init_get,
.to_string = attr_bool_to_string,
.filter = attr_bool_filter,
.attr_default = (void *)false,
.print = PRINT_SUITE,
}
};
/* Helper Functions to Access Attributes */
const char *kunit_attr_filter_name(struct kunit_attr_filter filter)
{
return filter.attr->name;
}
void kunit_print_attr(void *test_or_suite, bool is_test, unsigned int test_level)
{
int i;
bool to_free = false;
void *attr;
const char *attr_name, *attr_str;
struct kunit_suite *suite = is_test ? NULL : test_or_suite;
struct kunit_case *test = is_test ? test_or_suite : NULL;
for (i = 0; i < ARRAY_SIZE(kunit_attr_list); i++) {
if (kunit_attr_list[i].print == PRINT_NEVER ||
(test && kunit_attr_list[i].print == PRINT_SUITE))
continue;
attr = kunit_attr_list[i].get_attr(test_or_suite, is_test);
if (attr) {
attr_name = kunit_attr_list[i].name;
attr_str = kunit_attr_list[i].to_string(attr, &to_free);
if (test) {
kunit_log(KERN_INFO, test, "%*s# %s.%s: %s",
KUNIT_INDENT_LEN * test_level, "", test->name,
attr_name, attr_str);
} else {
kunit_log(KERN_INFO, suite, "%*s# %s: %s",
KUNIT_INDENT_LEN * test_level, "", attr_name, attr_str);
}
/* Free to_string of attribute if needed */
if (to_free)
kfree(attr_str);
}
}
}
/* Helper Functions to Filter Attributes */
int kunit_get_filter_count(char *input)
{
int i, comma_index = 0, count = 0;
for (i = 0; input[i]; i++) {
if (input[i] == ',') {
if ((i - comma_index) > 1)
count++;
comma_index = i;
}
}
if ((i - comma_index) > 0)
count++;
return count;
}
struct kunit_attr_filter kunit_next_attr_filter(char **filters, int *err)
{
struct kunit_attr_filter filter = {};
int i, j, comma_index = 0, new_start_index = 0;
int op_index = -1, attr_index = -1;
char op;
char *input = *filters;
/* Parse input until operation */
for (i = 0; input[i]; i++) {
if (op_index < 0 && strchr(op_list, input[i])) {
op_index = i;
} else if (!comma_index && input[i] == ',') {
comma_index = i;
} else if (comma_index && input[i] != ' ') {
new_start_index = i;
break;
}
}
if (op_index <= 0) {
*err = -EINVAL;
pr_err("kunit executor: filter operation not found: %s\n", input);
return filter;
}
/* Temporarily set operator to \0 character. */
op = input[op_index];
input[op_index] = '\0';
/* Find associated kunit_attr object */
for (j = 0; j < ARRAY_SIZE(kunit_attr_list); j++) {
if (!strcmp(input, kunit_attr_list[j].name)) {
attr_index = j;
break;
}
}
input[op_index] = op;
if (attr_index < 0) {
*err = -EINVAL;
pr_err("kunit executor: attribute not found: %s\n", input);
} else {
filter.attr = &kunit_attr_list[attr_index];
}
if (comma_index > 0) {
input[comma_index] = '\0';
filter.input = input + op_index;
input = input + new_start_index;
} else {
filter.input = input + op_index;
input = NULL;
}
*filters = input;
return filter;
}
struct kunit_suite *kunit_filter_attr_tests(const struct kunit_suite *const suite,
struct kunit_attr_filter filter, char *action, int *err)
{
int n = 0;
struct kunit_case *filtered, *test_case;
struct kunit_suite *copy;
void *suite_val, *test_val;
bool suite_result, test_result, default_result, result;
/* Allocate memory for new copy of suite and list of test cases */
copy = kmemdup(suite, sizeof(*copy), GFP_KERNEL);
if (!copy)
return ERR_PTR(-ENOMEM);
kunit_suite_for_each_test_case(suite, test_case) { n++; }
filtered = kcalloc(n + 1, sizeof(*filtered), GFP_KERNEL);
if (!filtered) {
kfree(copy);
return ERR_PTR(-ENOMEM);
}
n = 0;
/* Save filtering result on default value */
default_result = filter.attr->filter(filter.attr->attr_default, filter.input, err);
if (*err)
goto err;
/* Save suite attribute value and filtering result on that value */
suite_val = filter.attr->get_attr((void *)suite, false);
suite_result = filter.attr->filter(suite_val, filter.input, err);
if (*err)
goto err;
/* For each test case, save test case if passes filtering. */
kunit_suite_for_each_test_case(suite, test_case) {
test_val = filter.attr->get_attr((void *) test_case, true);
test_result = filter.attr->filter(filter.attr->get_attr(test_case, true),
filter.input, err);
if (*err)
goto err;
/*
* If attribute value of test case is set, filter on that value.
* If not, filter on suite value if set. If not, filter on
* default value.
*/
result = false;
if (test_val) {
if (test_result)
result = true;
} else if (suite_val) {
if (suite_result)
result = true;
} else if (default_result) {
result = true;
}
if (result) {
filtered[n++] = *test_case;
} else if (action && strcmp(action, "skip") == 0) {
test_case->status = KUNIT_SKIPPED;
filtered[n++] = *test_case;
}
}
err:
if (n == 0 || *err) {
kfree(copy);
kfree(filtered);
return NULL;
}
copy->test_cases = filtered;
return copy;
}
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