summaryrefslogtreecommitdiffstats
path: root/lib/kunit/resource.c
diff options
context:
space:
mode:
Diffstat (limited to 'lib/kunit/resource.c')
-rw-r--r--lib/kunit/resource.c178
1 files changed, 178 insertions, 0 deletions
diff --git a/lib/kunit/resource.c b/lib/kunit/resource.c
new file mode 100644
index 0000000000..f0209252b1
--- /dev/null
+++ b/lib/kunit/resource.c
@@ -0,0 +1,178 @@
+// 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);