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// SPDX-License-Identifier: GPL-2.0
/*
* KUnit resource API for test managed resources (allocations, etc.).
*
* Copyright (C) 2022, Google LLC.
* Author: Daniel Latypov <dlatypov@google.com>
*/
#include <kunit/resource.h>
#include <kunit/test.h>
#include <linux/kref.h>
/*
* Used for static resources and when a kunit_resource * has been created by
* kunit_alloc_resource(). When an init function is supplied, @data is passed
* into the init function; otherwise, we simply set the resource data field to
* the data value passed in. Doesn't initialize res->should_kfree.
*/
int __kunit_add_resource(struct kunit *test,
kunit_resource_init_t init,
kunit_resource_free_t free,
struct kunit_resource *res,
void *data)
{
int ret = 0;
unsigned long flags;
res->free = free;
kref_init(&res->refcount);
if (init) {
ret = init(res, data);
if (ret)
return ret;
} else {
res->data = data;
}
spin_lock_irqsave(&test->lock, flags);
list_add_tail(&res->node, &test->resources);
/* refcount for list is established by kref_init() */
spin_unlock_irqrestore(&test->lock, flags);
return ret;
}
EXPORT_SYMBOL_GPL(__kunit_add_resource);
void kunit_remove_resource(struct kunit *test, struct kunit_resource *res)
{
unsigned long flags;
bool was_linked;
spin_lock_irqsave(&test->lock, flags);
was_linked = !list_empty(&res->node);
list_del_init(&res->node);
spin_unlock_irqrestore(&test->lock, flags);
if (was_linked)
kunit_put_resource(res);
}
EXPORT_SYMBOL_GPL(kunit_remove_resource);
int kunit_destroy_resource(struct kunit *test, kunit_resource_match_t match,
void *match_data)
{
struct kunit_resource *res = kunit_find_resource(test, match,
match_data);
if (!res)
return -ENOENT;
kunit_remove_resource(test, res);
/* We have a reference also via _find(); drop it. */
kunit_put_resource(res);
return 0;
}
EXPORT_SYMBOL_GPL(kunit_destroy_resource);
struct kunit_action_ctx {
struct kunit_resource res;
kunit_action_t *func;
void *ctx;
};
static void __kunit_action_free(struct kunit_resource *res)
{
struct kunit_action_ctx *action_ctx = container_of(res, struct kunit_action_ctx, res);
action_ctx->func(action_ctx->ctx);
}
int kunit_add_action(struct kunit *test, void (*action)(void *), void *ctx)
{
struct kunit_action_ctx *action_ctx;
KUNIT_ASSERT_NOT_NULL_MSG(test, action, "Tried to action a NULL function!");
action_ctx = kzalloc(sizeof(*action_ctx), GFP_KERNEL);
if (!action_ctx)
return -ENOMEM;
action_ctx->func = action;
action_ctx->ctx = ctx;
action_ctx->res.should_kfree = true;
/* As init is NULL, this cannot fail. */
__kunit_add_resource(test, NULL, __kunit_action_free, &action_ctx->res, action_ctx);
return 0;
}
EXPORT_SYMBOL_GPL(kunit_add_action);
int kunit_add_action_or_reset(struct kunit *test, void (*action)(void *),
void *ctx)
{
int res = kunit_add_action(test, action, ctx);
if (res)
action(ctx);
return res;
}
EXPORT_SYMBOL_GPL(kunit_add_action_or_reset);
static bool __kunit_action_match(struct kunit *test,
struct kunit_resource *res, void *match_data)
{
struct kunit_action_ctx *match_ctx = (struct kunit_action_ctx *)match_data;
struct kunit_action_ctx *res_ctx = container_of(res, struct kunit_action_ctx, res);
/* Make sure this is a free function. */
if (res->free != __kunit_action_free)
return false;
/* Both the function and context data should match. */
return (match_ctx->func == res_ctx->func) && (match_ctx->ctx == res_ctx->ctx);
}
void kunit_remove_action(struct kunit *test,
kunit_action_t *action,
void *ctx)
{
struct kunit_action_ctx match_ctx;
struct kunit_resource *res;
match_ctx.func = action;
match_ctx.ctx = ctx;
res = kunit_find_resource(test, __kunit_action_match, &match_ctx);
if (res) {
/* Remove the free function so we don't run the action. */
res->free = NULL;
kunit_remove_resource(test, res);
kunit_put_resource(res);
}
}
EXPORT_SYMBOL_GPL(kunit_remove_action);
void kunit_release_action(struct kunit *test,
kunit_action_t *action,
void *ctx)
{
struct kunit_action_ctx match_ctx;
struct kunit_resource *res;
match_ctx.func = action;
match_ctx.ctx = ctx;
res = kunit_find_resource(test, __kunit_action_match, &match_ctx);
if (res) {
kunit_remove_resource(test, res);
/* We have to put() this here, else free won't be called. */
kunit_put_resource(res);
}
}
EXPORT_SYMBOL_GPL(kunit_release_action);
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