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Subject[RFC v2 02/14] kunit: test: add test resource management API
From
Create a common API for test managed resources like memory and test
objects. A lot of times a test will want to set up infrastructure to be
used in test cases; this could be anything from just wanting to allocate
some memory to setting up a driver stack; this defines facilities for
creating "test resources" which are managed by the test infrastructure
and are automatically cleaned up at the conclusion of the test.

Signed-off-by: Brendan Higgins <brendanhiggins@google.com>
---
include/kunit/test.h | 109 +++++++++++++++++++++++++++++++++++++++++++
kunit/test.c | 95 +++++++++++++++++++++++++++++++++++++
2 files changed, 204 insertions(+)

diff --git a/include/kunit/test.h b/include/kunit/test.h
index e0b14b227ac44..1c116a20063da 100644
--- a/include/kunit/test.h
+++ b/include/kunit/test.h
@@ -12,6 +12,69 @@
#include <linux/types.h>
#include <linux/slab.h>

+struct test_resource;
+
+typedef int (*test_resource_init_t)(struct test_resource *, void *);
+typedef void (*test_resource_free_t)(struct test_resource *);
+
+/**
+ * struct test_resource - represents a *test managed resource*
+ * @allocation: for the user to store arbitrary data.
+ * @free: a user supplied function to free the resource. Populated by
+ * test_alloc_resource().
+ *
+ * Represents a *test managed resource*, a resource which will automatically be
+ * cleaned up at the end of a test case.
+ *
+ * Example:
+ *
+ * .. code-block:: c
+ *
+ * struct test_kmalloc_params {
+ * size_t size;
+ * gfp_t gfp;
+ * };
+ *
+ * static int test_kmalloc_init(struct test_resource *res, void *context)
+ * {
+ * struct test_kmalloc_params *params = context;
+ * res->allocation = kmalloc(params->size, params->gfp);
+ *
+ * if (!res->allocation)
+ * return -ENOMEM;
+ *
+ * return 0;
+ * }
+ *
+ * static void test_kmalloc_free(struct test_resource *res)
+ * {
+ * kfree(res->allocation);
+ * }
+ *
+ * void *test_kmalloc(struct test *test, size_t size, gfp_t gfp)
+ * {
+ * struct test_kmalloc_params params;
+ * struct test_resource *res;
+ *
+ * params.size = size;
+ * params.gfp = gfp;
+ *
+ * res = test_alloc_resource(test, test_kmalloc_init,
+ * test_kmalloc_free, &params);
+ * if (res)
+ * return res->allocation;
+ * else
+ * return NULL;
+ * }
+ */
+struct test_resource {
+ void *allocation;
+ test_resource_free_t free;
+
+ /* private: internal use only. */
+ struct list_head node;
+};
+
struct test;

/**
@@ -104,6 +167,7 @@ struct test {
const char *name; /* Read only after initialization! */
spinlock_t lock; /* Gaurds all mutable test state. */
bool success; /* Protected by lock. */
+ struct list_head resources; /* Protected by lock. */
void (*vprintk)(const struct test *test,
const char *level,
struct va_format *vaf);
@@ -127,6 +191,51 @@ int test_run_tests(struct test_module *module);
} \
late_initcall(module_test_init##module)

+/**
+ * test_alloc_resource() - Allocates a *test managed resource*.
+ * @test: The test context object.
+ * @init: a user supplied function to initialize the resource.
+ * @free: a user supplied function to free the resource.
+ * @context: for the user to pass in arbitrary data.
+ *
+ * Allocates a *test managed resource*, a resource which will automatically be
+ * cleaned up at the end of a test case. See &struct test_resource for an
+ * example.
+ */
+struct test_resource *test_alloc_resource(struct test *test,
+ test_resource_init_t init,
+ test_resource_free_t free,
+ void *context);
+
+void test_free_resource(struct test *test, struct test_resource *res);
+
+/**
+ * test_kmalloc() - Just like kmalloc() except the allocation is *test managed*.
+ * @test: The test context object.
+ * @size: The size in bytes of the desired memory.
+ * @gfp: flags passed to underlying kmalloc().
+ *
+ * Just like `kmalloc(...)`, except the allocation is managed by the test case
+ * and is automatically cleaned up after the test case concludes. See &struct
+ * test_resource for more information.
+ */
+void *test_kmalloc(struct test *test, size_t size, gfp_t gfp);
+
+/**
+ * test_kzalloc() - Just like test_kmalloc(), but zeroes the allocation.
+ * @test: The test context object.
+ * @size: The size in bytes of the desired memory.
+ * @gfp: flags passed to underlying kmalloc().
+ *
+ * See kzalloc() and test_kmalloc() for more information.
+ */
+static inline void *test_kzalloc(struct test *test, size_t size, gfp_t gfp)
+{
+ return test_kmalloc(test, size, gfp | __GFP_ZERO);
+}
+
+void test_cleanup(struct test *test);
+
void __printf(3, 4) test_printk(const char *level,
const struct test *test,
const char *fmt, ...);
diff --git a/kunit/test.c b/kunit/test.c
index 4732e5f0d7575..fd0a51245215e 100644
--- a/kunit/test.c
+++ b/kunit/test.c
@@ -66,6 +66,7 @@ static void test_vprintk(const struct test *test,
int test_init_test(struct test *test, const char *name)
{
spin_lock_init(&test->lock);
+ INIT_LIST_HEAD(&test->resources);
test->name = name;
test->vprintk = test_vprintk;

@@ -93,6 +94,11 @@ static void test_run_case_internal(struct test *test,
test_case->run_case(test);
}

+static void test_case_internal_cleanup(struct test *test)
+{
+ test_cleanup(test);
+}
+
/*
* Performs post validations and cleanup after a test case was run.
* XXX: Should ONLY BE CALLED AFTER test_run_case_internal!
@@ -103,6 +109,8 @@ static void test_run_case_cleanup(struct test *test,
{
if (module->exit)
module->exit(test);
+
+ test_case_internal_cleanup(test);
}

/*
@@ -150,6 +158,93 @@ int test_run_tests(struct test_module *module)
return 0;
}

+struct test_resource *test_alloc_resource(struct test *test,
+ test_resource_init_t init,
+ test_resource_free_t free,
+ void *context)
+{
+ struct test_resource *res;
+ unsigned long flags;
+ int ret;
+
+ res = kzalloc(sizeof(*res), GFP_KERNEL);
+ if (!res)
+ return NULL;
+
+ ret = init(res, context);
+ if (ret)
+ return NULL;
+
+ res->free = free;
+ spin_lock_irqsave(&test->lock, flags);
+ list_add_tail(&res->node, &test->resources);
+ spin_unlock_irqrestore(&test->lock, flags);
+
+ return res;
+}
+
+void test_free_resource(struct test *test, struct test_resource *res)
+{
+ res->free(res);
+ list_del(&res->node);
+ kfree(res);
+}
+
+struct test_kmalloc_params {
+ size_t size;
+ gfp_t gfp;
+};
+
+static int test_kmalloc_init(struct test_resource *res, void *context)
+{
+ struct test_kmalloc_params *params = context;
+
+ res->allocation = kmalloc(params->size, params->gfp);
+ if (!res->allocation)
+ return -ENOMEM;
+
+ return 0;
+}
+
+static void test_kmalloc_free(struct test_resource *res)
+{
+ kfree(res->allocation);
+}
+
+void *test_kmalloc(struct test *test, size_t size, gfp_t gfp)
+{
+ struct test_kmalloc_params params;
+ struct test_resource *res;
+
+ params.size = size;
+ params.gfp = gfp;
+
+ res = test_alloc_resource(test,
+ test_kmalloc_init,
+ test_kmalloc_free,
+ &params);
+
+ if (res)
+ return res->allocation;
+ else
+ return NULL;
+}
+
+void test_cleanup(struct test *test)
+{
+ struct test_resource *resource, *resource_safe;
+ unsigned long flags;
+
+ spin_lock_irqsave(&test->lock, flags);
+ list_for_each_entry_safe(resource,
+ resource_safe,
+ &test->resources,
+ node) {
+ test_free_resource(test, resource);
+ }
+ spin_unlock_irqrestore(&test->lock, flags);
+}
+
void test_printk(const char *level,
const struct test *test,
const char *fmt, ...)
--
2.19.1.568.g152ad8e336-goog
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