407 lines
12 KiB
C
407 lines
12 KiB
C
/* 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>
|
|
*/
|
|
|
|
#ifndef _KUNIT_RESOURCE_H
|
|
#define _KUNIT_RESOURCE_H
|
|
|
|
#include <kunit/test.h>
|
|
|
|
#include <linux/kref.h>
|
|
#include <linux/list.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/spinlock.h>
|
|
|
|
struct kunit_resource;
|
|
|
|
typedef int (*kunit_resource_init_t)(struct kunit_resource *, void *);
|
|
typedef void (*kunit_resource_free_t)(struct kunit_resource *);
|
|
|
|
/**
|
|
* struct kunit_resource - represents a *test managed resource*
|
|
* @data: for the user to store arbitrary data.
|
|
* @name: optional name
|
|
* @free: a user supplied function to free the resource.
|
|
*
|
|
* Represents a *test managed resource*, a resource which will automatically be
|
|
* cleaned up at the end of a test case. This cleanup is performed by the 'free'
|
|
* function. The struct kunit_resource itself is freed automatically with
|
|
* kfree() if it was allocated by KUnit (e.g., by kunit_alloc_resource()), but
|
|
* must be freed by the user otherwise.
|
|
*
|
|
* Resources are reference counted so if a resource is retrieved via
|
|
* kunit_alloc_and_get_resource() or kunit_find_resource(), we need
|
|
* to call kunit_put_resource() to reduce the resource reference count
|
|
* when finished with it. Note that kunit_alloc_resource() does not require a
|
|
* kunit_resource_put() because it does not retrieve the resource itself.
|
|
*
|
|
* Example:
|
|
*
|
|
* .. code-block:: c
|
|
*
|
|
* struct kunit_kmalloc_params {
|
|
* size_t size;
|
|
* gfp_t gfp;
|
|
* };
|
|
*
|
|
* static int kunit_kmalloc_init(struct kunit_resource *res, void *context)
|
|
* {
|
|
* struct kunit_kmalloc_params *params = context;
|
|
* res->data = kmalloc(params->size, params->gfp);
|
|
*
|
|
* if (!res->data)
|
|
* return -ENOMEM;
|
|
*
|
|
* return 0;
|
|
* }
|
|
*
|
|
* static void kunit_kmalloc_free(struct kunit_resource *res)
|
|
* {
|
|
* kfree(res->data);
|
|
* }
|
|
*
|
|
* void *kunit_kmalloc(struct kunit *test, size_t size, gfp_t gfp)
|
|
* {
|
|
* struct kunit_kmalloc_params params;
|
|
*
|
|
* params.size = size;
|
|
* params.gfp = gfp;
|
|
*
|
|
* return kunit_alloc_resource(test, kunit_kmalloc_init,
|
|
* kunit_kmalloc_free, ¶ms);
|
|
* }
|
|
*
|
|
* Resources can also be named, with lookup/removal done on a name
|
|
* basis also. kunit_add_named_resource(), kunit_find_named_resource()
|
|
* and kunit_destroy_named_resource(). Resource names must be
|
|
* unique within the test instance.
|
|
*/
|
|
struct kunit_resource {
|
|
void *data;
|
|
const char *name;
|
|
kunit_resource_free_t free;
|
|
|
|
/* private: internal use only. */
|
|
struct kref refcount;
|
|
struct list_head node;
|
|
bool should_kfree;
|
|
};
|
|
|
|
/**
|
|
* kunit_get_resource() - Hold resource for use. Should not need to be used
|
|
* by most users as we automatically get resources
|
|
* retrieved by kunit_find_resource*().
|
|
* @res: resource
|
|
*/
|
|
static inline void kunit_get_resource(struct kunit_resource *res)
|
|
{
|
|
kref_get(&res->refcount);
|
|
}
|
|
|
|
/*
|
|
* Called when refcount reaches zero via kunit_put_resource();
|
|
* should not be called directly.
|
|
*/
|
|
static inline void kunit_release_resource(struct kref *kref)
|
|
{
|
|
struct kunit_resource *res = container_of(kref, struct kunit_resource,
|
|
refcount);
|
|
|
|
if (res->free)
|
|
res->free(res);
|
|
|
|
/* 'res' is valid here, as if should_kfree is set, res->free may not free
|
|
* 'res' itself, just res->data
|
|
*/
|
|
if (res->should_kfree)
|
|
kfree(res);
|
|
}
|
|
|
|
/**
|
|
* kunit_put_resource() - When caller is done with retrieved resource,
|
|
* kunit_put_resource() should be called to drop
|
|
* reference count. The resource list maintains
|
|
* a reference count on resources, so if no users
|
|
* are utilizing a resource and it is removed from
|
|
* the resource list, it will be freed via the
|
|
* associated free function (if any). Only
|
|
* needs to be used if we alloc_and_get() or
|
|
* find() resource.
|
|
* @res: resource
|
|
*/
|
|
static inline void kunit_put_resource(struct kunit_resource *res)
|
|
{
|
|
kref_put(&res->refcount, kunit_release_resource);
|
|
}
|
|
|
|
/**
|
|
* __kunit_add_resource() - Internal helper to add a resource.
|
|
*
|
|
* res->should_kfree is not initialised.
|
|
* @test: The test context object.
|
|
* @init: a user-supplied function to initialize the result (if needed). If
|
|
* none is supplied, the resource data value is simply set to @data.
|
|
* If an init function is supplied, @data is passed to it instead.
|
|
* @free: a user-supplied function to free the resource (if needed).
|
|
* @res: The resource.
|
|
* @data: value to pass to init function or set in resource data field.
|
|
*/
|
|
int __kunit_add_resource(struct kunit *test,
|
|
kunit_resource_init_t init,
|
|
kunit_resource_free_t free,
|
|
struct kunit_resource *res,
|
|
void *data);
|
|
|
|
/**
|
|
* kunit_add_resource() - Add a *test managed resource*.
|
|
* @test: The test context object.
|
|
* @init: a user-supplied function to initialize the result (if needed). If
|
|
* none is supplied, the resource data value is simply set to @data.
|
|
* If an init function is supplied, @data is passed to it instead.
|
|
* @free: a user-supplied function to free the resource (if needed).
|
|
* @res: The resource.
|
|
* @data: value to pass to init function or set in resource data field.
|
|
*/
|
|
static inline int kunit_add_resource(struct kunit *test,
|
|
kunit_resource_init_t init,
|
|
kunit_resource_free_t free,
|
|
struct kunit_resource *res,
|
|
void *data)
|
|
{
|
|
res->should_kfree = false;
|
|
return __kunit_add_resource(test, init, free, res, data);
|
|
}
|
|
|
|
static inline struct kunit_resource *
|
|
kunit_find_named_resource(struct kunit *test, const char *name);
|
|
|
|
/**
|
|
* kunit_add_named_resource() - Add a named *test managed resource*.
|
|
* @test: The test context object.
|
|
* @init: a user-supplied function to initialize the resource data, if needed.
|
|
* @free: a user-supplied function to free the resource data, if needed.
|
|
* @res: The resource.
|
|
* @name: name to be set for resource.
|
|
* @data: value to pass to init function or set in resource data field.
|
|
*/
|
|
static inline int kunit_add_named_resource(struct kunit *test,
|
|
kunit_resource_init_t init,
|
|
kunit_resource_free_t free,
|
|
struct kunit_resource *res,
|
|
const char *name,
|
|
void *data)
|
|
{
|
|
struct kunit_resource *existing;
|
|
|
|
if (!name)
|
|
return -EINVAL;
|
|
|
|
existing = kunit_find_named_resource(test, name);
|
|
if (existing) {
|
|
kunit_put_resource(existing);
|
|
return -EEXIST;
|
|
}
|
|
|
|
res->name = name;
|
|
res->should_kfree = false;
|
|
|
|
return __kunit_add_resource(test, init, free, res, data);
|
|
}
|
|
|
|
/**
|
|
* kunit_alloc_and_get_resource() - Allocates and returns 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 (if needed).
|
|
* @internal_gfp: gfp to use for internal allocations, if unsure, use GFP_KERNEL
|
|
* @context: for the user to pass in arbitrary data to the init function.
|
|
*
|
|
* Allocates a *test managed resource*, a resource which will automatically be
|
|
* cleaned up at the end of a test case. See &struct kunit_resource for an
|
|
* example.
|
|
*
|
|
* This is effectively identical to kunit_alloc_resource, but returns the
|
|
* struct kunit_resource pointer, not just the 'data' pointer. It therefore
|
|
* also increments the resource's refcount, so kunit_put_resource() should be
|
|
* called when you've finished with it.
|
|
*
|
|
* Note: KUnit needs to allocate memory for a kunit_resource object. You must
|
|
* specify an @internal_gfp that is compatible with the use context of your
|
|
* resource.
|
|
*/
|
|
static inline struct kunit_resource *
|
|
kunit_alloc_and_get_resource(struct kunit *test,
|
|
kunit_resource_init_t init,
|
|
kunit_resource_free_t free,
|
|
gfp_t internal_gfp,
|
|
void *context)
|
|
{
|
|
struct kunit_resource *res;
|
|
int ret;
|
|
|
|
res = kzalloc(sizeof(*res), internal_gfp);
|
|
if (!res)
|
|
return NULL;
|
|
|
|
res->should_kfree = true;
|
|
|
|
ret = __kunit_add_resource(test, init, free, res, context);
|
|
if (!ret) {
|
|
/*
|
|
* bump refcount for get; kunit_resource_put() should be called
|
|
* when done.
|
|
*/
|
|
kunit_get_resource(res);
|
|
return res;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
/**
|
|
* kunit_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 (if needed).
|
|
* @internal_gfp: gfp to use for internal allocations, if unsure, use GFP_KERNEL
|
|
* @context: for the user to pass in arbitrary data to the init function.
|
|
*
|
|
* Allocates a *test managed resource*, a resource which will automatically be
|
|
* cleaned up at the end of a test case. See &struct kunit_resource for an
|
|
* example.
|
|
*
|
|
* Note: KUnit needs to allocate memory for a kunit_resource object. You must
|
|
* specify an @internal_gfp that is compatible with the use context of your
|
|
* resource.
|
|
*/
|
|
static inline void *kunit_alloc_resource(struct kunit *test,
|
|
kunit_resource_init_t init,
|
|
kunit_resource_free_t free,
|
|
gfp_t internal_gfp,
|
|
void *context)
|
|
{
|
|
struct kunit_resource *res;
|
|
|
|
res = kzalloc(sizeof(*res), internal_gfp);
|
|
if (!res)
|
|
return NULL;
|
|
|
|
res->should_kfree = true;
|
|
if (!__kunit_add_resource(test, init, free, res, context))
|
|
return res->data;
|
|
|
|
return NULL;
|
|
}
|
|
|
|
typedef bool (*kunit_resource_match_t)(struct kunit *test,
|
|
struct kunit_resource *res,
|
|
void *match_data);
|
|
|
|
/**
|
|
* kunit_resource_instance_match() - Match a resource with the same instance.
|
|
* @test: Test case to which the resource belongs.
|
|
* @res: The resource.
|
|
* @match_data: The resource pointer to match against.
|
|
*
|
|
* An instance of kunit_resource_match_t that matches a resource whose
|
|
* allocation matches @match_data.
|
|
*/
|
|
static inline bool kunit_resource_instance_match(struct kunit *test,
|
|
struct kunit_resource *res,
|
|
void *match_data)
|
|
{
|
|
return res->data == match_data;
|
|
}
|
|
|
|
/**
|
|
* kunit_resource_name_match() - Match a resource with the same name.
|
|
* @test: Test case to which the resource belongs.
|
|
* @res: The resource.
|
|
* @match_name: The name to match against.
|
|
*/
|
|
static inline bool kunit_resource_name_match(struct kunit *test,
|
|
struct kunit_resource *res,
|
|
void *match_name)
|
|
{
|
|
return res->name && strcmp(res->name, match_name) == 0;
|
|
}
|
|
|
|
/**
|
|
* kunit_find_resource() - Find a resource using match function/data.
|
|
* @test: Test case to which the resource belongs.
|
|
* @match: match function to be applied to resources/match data.
|
|
* @match_data: data to be used in matching.
|
|
*/
|
|
static inline struct kunit_resource *
|
|
kunit_find_resource(struct kunit *test,
|
|
kunit_resource_match_t match,
|
|
void *match_data)
|
|
{
|
|
struct kunit_resource *res, *found = NULL;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&test->lock, flags);
|
|
|
|
list_for_each_entry_reverse(res, &test->resources, node) {
|
|
if (match(test, res, (void *)match_data)) {
|
|
found = res;
|
|
kunit_get_resource(found);
|
|
break;
|
|
}
|
|
}
|
|
|
|
spin_unlock_irqrestore(&test->lock, flags);
|
|
|
|
return found;
|
|
}
|
|
|
|
/**
|
|
* kunit_find_named_resource() - Find a resource using match name.
|
|
* @test: Test case to which the resource belongs.
|
|
* @name: match name.
|
|
*/
|
|
static inline struct kunit_resource *
|
|
kunit_find_named_resource(struct kunit *test,
|
|
const char *name)
|
|
{
|
|
return kunit_find_resource(test, kunit_resource_name_match,
|
|
(void *)name);
|
|
}
|
|
|
|
/**
|
|
* kunit_destroy_resource() - Find a kunit_resource and destroy it.
|
|
* @test: Test case to which the resource belongs.
|
|
* @match: Match function. Returns whether a given resource matches @match_data.
|
|
* @match_data: Data passed into @match.
|
|
*
|
|
* RETURNS:
|
|
* 0 if kunit_resource is found and freed, -ENOENT if not found.
|
|
*/
|
|
int kunit_destroy_resource(struct kunit *test,
|
|
kunit_resource_match_t match,
|
|
void *match_data);
|
|
|
|
static inline int kunit_destroy_named_resource(struct kunit *test,
|
|
const char *name)
|
|
{
|
|
return kunit_destroy_resource(test, kunit_resource_name_match,
|
|
(void *)name);
|
|
}
|
|
|
|
/**
|
|
* kunit_remove_resource() - remove resource from resource list associated with
|
|
* test.
|
|
* @test: The test context object.
|
|
* @res: The resource to be removed.
|
|
*
|
|
* Note that the resource will not be immediately freed since it is likely
|
|
* the caller has a reference to it via alloc_and_get() or find();
|
|
* in this case a final call to kunit_put_resource() is required.
|
|
*/
|
|
void kunit_remove_resource(struct kunit *test, struct kunit_resource *res);
|
|
|
|
#endif /* _KUNIT_RESOURCE_H */
|