From patchwork Fri May 29 21:46:20 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alan Maguire X-Patchwork-Id: 208454 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.8 required=3.0 tests=DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE, SPF_PASS, UNPARSEABLE_RELAY, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 662BAC433E0 for ; Fri, 29 May 2020 21:46:46 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2A20B2071A for ; Fri, 29 May 2020 21:46:46 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=oracle.com header.i=@oracle.com header.b="cLlnZmhL" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728514AbgE2Vqp (ORCPT ); Fri, 29 May 2020 17:46:45 -0400 Received: from userp2120.oracle.com ([156.151.31.85]:46418 "EHLO userp2120.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727947AbgE2Vqo (ORCPT ); Fri, 29 May 2020 17:46:44 -0400 Received: from pps.filterd (userp2120.oracle.com [127.0.0.1]) by userp2120.oracle.com (8.16.0.42/8.16.0.42) with SMTP id 04TLbve9105574; Fri, 29 May 2020 21:46:38 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.com; h=from : to : cc : subject : date : message-id : in-reply-to : references; s=corp-2020-01-29; bh=cgDhzr/Id2aWqlqf68QCPzoANsL5lt/ueUtgLrptOT4=; b=cLlnZmhLwYKJy5GQLV9C9sBq1qrh03n3ScSglANkW9Cj1zkBI8c1NoIYWqLaxuVcg+U7 I/le/apezLwxDZG6nHhITfrqi7kwDj7S0lPd57Z8TkW0SbH16qP2JT9irpZWUN3xUZPL LHQy2upj6Y4O86Wi6mQaxkC1RGJkGZQGVsapYSywjwXXk3KReZ7Vv+NWkQnzXTGBmraa JxXDE+orvsDTMYG02yUFCHNWxSjUZomzanoDwTgOmRIMxtPrkonehKyVjQQ4uruB+ikm 889QcXfVK/5bJrnfFwX0a7QmWfdYdmJMfi9lMAY83JP6IJoGp3m+SyMtHK+uM1unofaP hA== Received: from userp3030.oracle.com (userp3030.oracle.com [156.151.31.80]) by userp2120.oracle.com with ESMTP id 318xbkcnqk-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=FAIL); Fri, 29 May 2020 21:46:37 +0000 Received: from pps.filterd (userp3030.oracle.com [127.0.0.1]) by userp3030.oracle.com (8.16.0.42/8.16.0.42) with SMTP id 04TLX1bu122756; Fri, 29 May 2020 21:46:37 GMT Received: from aserv0122.oracle.com (aserv0122.oracle.com [141.146.126.236]) by userp3030.oracle.com with ESMTP id 317ds4vn9x-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 29 May 2020 21:46:37 +0000 Received: from abhmp0014.oracle.com (abhmp0014.oracle.com [141.146.116.20]) by aserv0122.oracle.com (8.14.4/8.14.4) with ESMTP id 04TLkaLW011343; Fri, 29 May 2020 21:46:36 GMT Received: from localhost.uk.oracle.com (/10.175.189.67) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Fri, 29 May 2020 14:46:35 -0700 From: Alan Maguire To: brendanhiggins@google.com, skhan@linuxfoundation.org Cc: davidgow@google.com, trishalfonso@google.com, linux-kselftest@vger.kernel.org, kunit-dev@googlegroups.com, linux-kernel@vger.kernel.org, Alan Maguire Subject: [PATCH v4 kunit-next 1/2] kunit: generalize kunit_resource API beyond allocated resources Date: Fri, 29 May 2020 22:46:20 +0100 Message-Id: <1590788781-1895-2-git-send-email-alan.maguire@oracle.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1590788781-1895-1-git-send-email-alan.maguire@oracle.com> References: <1590788781-1895-1-git-send-email-alan.maguire@oracle.com> X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9636 signatures=668686 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 spamscore=0 phishscore=0 malwarescore=0 mlxlogscore=999 adultscore=0 suspectscore=0 bulkscore=0 mlxscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2004280000 definitions=main-2005290155 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9636 signatures=668686 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 mlxlogscore=999 spamscore=0 mlxscore=0 lowpriorityscore=0 priorityscore=1501 phishscore=0 cotscore=-2147483648 suspectscore=0 bulkscore=0 clxscore=1015 impostorscore=0 malwarescore=0 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2004280000 definitions=main-2005290155 Sender: linux-kselftest-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org In its original form, the kunit resources API - consisting the struct kunit_resource and associated functions - was focused on adding allocated resources during test operation that would be automatically cleaned up on test completion. The recent RFC patch proposing converting KASAN tests to KUnit [1] showed another potential model - where outside of test context, but with a pointer to the test state, we wish to access/update test-related data, but expressly want to avoid allocations. It turns out we can generalize the kunit_resource to support static resources where the struct kunit_resource * is passed in and initialized for us. As part of this work, we also change the "allocation" field to the more general "data" name, as instead of associating an allocation, we can associate a pointer to static data. Static data is distinguished by a NULL free functions. A test is added to cover using kunit_add_resource() with a static resource and data. Finally we also make use of the kernel's krefcount interfaces to manage reference counting of KUnit resources. The motivation for this is simple; if we have kernel threads accessing and using resources (say via kunit_find_resource()) we need to ensure we do not remove said resources (or indeed free them if they were dynamically allocated) until the reference count reaches zero. A new function - kunit_put_resource() - is added to handle this, and it should be called after a thread using kunit_find_resource() is finished with the retrieved resource. We ensure that the functions needed to look up, use and drop reference count are "static inline"-defined so that they can be used by builtin code as well as modules in the case that KUnit is built as a module. A cosmetic change here also; I've tried moving to kunit_[action]_resource() as the format of function names for consistency and readability. [1] https://lkml.org/lkml/2020/2/26/1286 Signed-off-by: Alan Maguire Reviewed-by: Brendan Higgins --- include/kunit/test.h | 156 +++++++++++++++++++++++++++++++++++++--------- lib/kunit/kunit-test.c | 74 ++++++++++++++++------ lib/kunit/string-stream.c | 14 ++--- lib/kunit/test.c | 153 ++++++++++++++++++++++++--------------------- 4 files changed, 268 insertions(+), 129 deletions(-) diff --git a/include/kunit/test.h b/include/kunit/test.h index 47e61e1..f9b914e 100644 --- a/include/kunit/test.h +++ b/include/kunit/test.h @@ -15,6 +15,7 @@ #include #include #include +#include struct kunit_resource; @@ -23,13 +24,19 @@ /** * struct kunit_resource - represents a *test managed resource* - * @allocation: for the user to store arbitrary data. + * @data: for the user to store arbitrary data. * @free: a user supplied function to free the resource. Populated by - * kunit_alloc_resource(). + * kunit_resource_alloc(). * * Represents a *test managed resource*, a resource which will automatically be * cleaned up at the end of a test case. * + * 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 @@ -42,9 +49,9 @@ * static int kunit_kmalloc_init(struct kunit_resource *res, void *context) * { * struct kunit_kmalloc_params *params = context; - * res->allocation = kmalloc(params->size, params->gfp); + * res->data = kmalloc(params->size, params->gfp); * - * if (!res->allocation) + * if (!res->data) * return -ENOMEM; * * return 0; @@ -52,30 +59,26 @@ * * static void kunit_kmalloc_free(struct kunit_resource *res) * { - * kfree(res->allocation); + * kfree(res->data); * } * * void *kunit_kmalloc(struct kunit *test, size_t size, gfp_t gfp) * { * struct kunit_kmalloc_params params; - * struct kunit_resource *res; * * params.size = size; * params.gfp = gfp; * - * res = kunit_alloc_resource(test, kunit_kmalloc_init, + * return kunit_alloc_resource(test, kunit_kmalloc_init, * kunit_kmalloc_free, ¶ms); - * if (res) - * return res->allocation; - * - * return NULL; * } */ struct kunit_resource { - void *allocation; - kunit_resource_free_t free; + void *data; /* private: internal use only. */ + kunit_resource_free_t free; + struct kref refcount; struct list_head node; }; @@ -284,6 +287,64 @@ struct kunit_resource *kunit_alloc_and_get_resource(struct kunit *test, void *context); /** + * 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_resources(); + * 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 free function is defined, resource was dynamically allocated. */ + if (res->free) { + res->free(res); + 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() - 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). + * @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_alloc_resource() - Allocates a *test managed resource*. * @test: The test context object. * @init: a user supplied function to initialize the resource. @@ -295,7 +356,7 @@ struct kunit_resource *kunit_alloc_and_get_resource(struct kunit *test, * cleaned up at the end of a test case. See &struct kunit_resource for an * example. * - * NOTE: KUnit needs to allocate memory for each kunit_resource object. You must + * 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. */ @@ -307,55 +368,90 @@ static inline void *kunit_alloc_resource(struct kunit *test, { struct kunit_resource *res; - res = kunit_alloc_and_get_resource(test, init, free, internal_gfp, - context); + res = kzalloc(sizeof(*res), internal_gfp); + if (!res) + return NULL; - if (res) - return res->allocation; + if (!kunit_add_resource(test, init, free, res, context)) + return res->data; return NULL; } typedef bool (*kunit_resource_match_t)(struct kunit *test, - const void *res, + 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 data stored in kunit_resource->allocation. + * @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, - const void *res, + struct kunit_resource *res, void *match_data) { - return res == match_data; + return res->data == match_data; } /** - * kunit_resource_destroy() - Find a kunit_resource and destroy it. + * 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; + + spin_lock(&test->lock); + + 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(&test->lock); + + return found; +} + +/** + * 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. - * @free: Must match free on the kunit_resource to free. * @match_data: Data passed into @match. * - * Free the latest kunit_resource of @test for which @free matches the - * kunit_resource_free_t associated with the resource and for which @match - * returns true. - * * RETURNS: * 0 if kunit_resource is found and freed, -ENOENT if not found. */ -int kunit_resource_destroy(struct kunit *test, +int kunit_destroy_resource(struct kunit *test, kunit_resource_match_t match, - kunit_resource_free_t free, void *match_data); /** + * 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); + +/** * kunit_kmalloc() - Like kmalloc() except the allocation is *test managed*. * @test: The test context object. * @size: The size in bytes of the desired memory. diff --git a/lib/kunit/kunit-test.c b/lib/kunit/kunit-test.c index 4f3d36a..03f3eca 100644 --- a/lib/kunit/kunit-test.c +++ b/lib/kunit/kunit-test.c @@ -118,14 +118,14 @@ static int fake_resource_init(struct kunit_resource *res, void *context) { struct kunit_test_resource_context *ctx = context; - res->allocation = &ctx->is_resource_initialized; + res->data = &ctx->is_resource_initialized; ctx->is_resource_initialized = true; return 0; } static void fake_resource_free(struct kunit_resource *res) { - bool *is_resource_initialized = res->allocation; + bool *is_resource_initialized = res->data; *is_resource_initialized = false; } @@ -154,11 +154,21 @@ static void kunit_resource_test_alloc_resource(struct kunit *test) KUNIT_ASSERT_NOT_ERR_OR_NULL(test, res); KUNIT_EXPECT_PTR_EQ(test, &ctx->is_resource_initialized, - (bool *) res->allocation); + (bool *)res->data); KUNIT_EXPECT_TRUE(test, list_is_last(&res->node, &ctx->test.resources)); KUNIT_EXPECT_PTR_EQ(test, free, res->free); + + kunit_put_resource(res); } +/* + * Note: tests below use kunit_alloc_and_get_resource(), so as a consequence + * they have a reference to the associated resource that they must release + * via kunit_put_resource(). In normal operation, users will only + * have to do this for cases where they use kunit_find_resource(), and the + * kunit_alloc_resource() function will be used (which does not take a + * resource reference). + */ static void kunit_resource_test_destroy_resource(struct kunit *test) { struct kunit_test_resource_context *ctx = test->priv; @@ -169,11 +179,12 @@ static void kunit_resource_test_destroy_resource(struct kunit *test) GFP_KERNEL, ctx); + kunit_put_resource(res); + KUNIT_ASSERT_FALSE(test, - kunit_resource_destroy(&ctx->test, + kunit_destroy_resource(&ctx->test, kunit_resource_instance_match, - res->free, - res->allocation)); + res->data)); KUNIT_EXPECT_FALSE(test, ctx->is_resource_initialized); KUNIT_EXPECT_TRUE(test, list_empty(&ctx->test.resources)); @@ -191,6 +202,7 @@ static void kunit_resource_test_cleanup_resources(struct kunit *test) fake_resource_free, GFP_KERNEL, ctx); + kunit_put_resource(resources[i]); } kunit_cleanup(&ctx->test); @@ -221,14 +233,14 @@ static int fake_resource_2_init(struct kunit_resource *res, void *context) KUNIT_RESOURCE_TEST_MARK_ORDER(ctx, allocate_order, 2); - res->allocation = ctx; + res->data = ctx; return 0; } static void fake_resource_2_free(struct kunit_resource *res) { - struct kunit_test_resource_context *ctx = res->allocation; + struct kunit_test_resource_context *ctx = res->data; KUNIT_RESOURCE_TEST_MARK_ORDER(ctx, free_order, 2); } @@ -236,23 +248,26 @@ static void fake_resource_2_free(struct kunit_resource *res) static int fake_resource_1_init(struct kunit_resource *res, void *context) { struct kunit_test_resource_context *ctx = context; + struct kunit_resource *res2; - kunit_alloc_and_get_resource(&ctx->test, - fake_resource_2_init, - fake_resource_2_free, - GFP_KERNEL, - ctx); + res2 = kunit_alloc_and_get_resource(&ctx->test, + fake_resource_2_init, + fake_resource_2_free, + GFP_KERNEL, + ctx); KUNIT_RESOURCE_TEST_MARK_ORDER(ctx, allocate_order, 1); - res->allocation = ctx; + res->data = ctx; + + kunit_put_resource(res2); return 0; } static void fake_resource_1_free(struct kunit_resource *res) { - struct kunit_test_resource_context *ctx = res->allocation; + struct kunit_test_resource_context *ctx = res->data; KUNIT_RESOURCE_TEST_MARK_ORDER(ctx, free_order, 1); } @@ -265,13 +280,14 @@ static void fake_resource_1_free(struct kunit_resource *res) static void kunit_resource_test_proper_free_ordering(struct kunit *test) { struct kunit_test_resource_context *ctx = test->priv; + struct kunit_resource *res; /* fake_resource_1 allocates a fake_resource_2 in its init. */ - kunit_alloc_and_get_resource(&ctx->test, - fake_resource_1_init, - fake_resource_1_free, - GFP_KERNEL, - ctx); + res = kunit_alloc_and_get_resource(&ctx->test, + fake_resource_1_init, + fake_resource_1_free, + GFP_KERNEL, + ctx); /* * Since fake_resource_2_init calls KUNIT_RESOURCE_TEST_MARK_ORDER @@ -281,6 +297,8 @@ static void kunit_resource_test_proper_free_ordering(struct kunit *test) KUNIT_EXPECT_EQ(test, ctx->allocate_order[0], 2); KUNIT_EXPECT_EQ(test, ctx->allocate_order[1], 1); + kunit_put_resource(res); + kunit_cleanup(&ctx->test); /* @@ -292,6 +310,21 @@ static void kunit_resource_test_proper_free_ordering(struct kunit *test) KUNIT_EXPECT_EQ(test, ctx->free_order[1], 2); } +static void kunit_resource_test_static(struct kunit *test) +{ + struct kunit_test_resource_context ctx; + struct kunit_resource res; + + KUNIT_EXPECT_EQ(test, kunit_add_resource(test, NULL, NULL, &res, &ctx), + 0); + + KUNIT_EXPECT_PTR_EQ(test, res.data, (void *)&ctx); + + kunit_cleanup(test); + + KUNIT_EXPECT_TRUE(test, list_empty(&test->resources)); +} + static int kunit_resource_test_init(struct kunit *test) { struct kunit_test_resource_context *ctx = @@ -320,6 +353,7 @@ static void kunit_resource_test_exit(struct kunit *test) KUNIT_CASE(kunit_resource_test_destroy_resource), KUNIT_CASE(kunit_resource_test_cleanup_resources), KUNIT_CASE(kunit_resource_test_proper_free_ordering), + KUNIT_CASE(kunit_resource_test_static), {} }; diff --git a/lib/kunit/string-stream.c b/lib/kunit/string-stream.c index 3503920..141789c 100644 --- a/lib/kunit/string-stream.c +++ b/lib/kunit/string-stream.c @@ -33,14 +33,14 @@ static int string_stream_fragment_init(struct kunit_resource *res, if (!frag->fragment) return -ENOMEM; - res->allocation = frag; + res->data = frag; return 0; } static void string_stream_fragment_free(struct kunit_resource *res) { - struct string_stream_fragment *frag = res->allocation; + struct string_stream_fragment *frag = res->data; list_del(&frag->node); kunit_kfree(frag->test, frag->fragment); @@ -65,9 +65,8 @@ static struct string_stream_fragment *alloc_string_stream_fragment( static int string_stream_fragment_destroy(struct string_stream_fragment *frag) { - return kunit_resource_destroy(frag->test, + return kunit_destroy_resource(frag->test, kunit_resource_instance_match, - string_stream_fragment_free, frag); } @@ -179,7 +178,7 @@ static int string_stream_init(struct kunit_resource *res, void *context) if (!stream) return -ENOMEM; - res->allocation = stream; + res->data = stream; stream->gfp = ctx->gfp; stream->test = ctx->test; INIT_LIST_HEAD(&stream->fragments); @@ -190,7 +189,7 @@ static int string_stream_init(struct kunit_resource *res, void *context) static void string_stream_free(struct kunit_resource *res) { - struct string_stream *stream = res->allocation; + struct string_stream *stream = res->data; string_stream_clear(stream); } @@ -211,8 +210,7 @@ struct string_stream *alloc_string_stream(struct kunit *test, gfp_t gfp) int string_stream_destroy(struct string_stream *stream) { - return kunit_resource_destroy(stream->test, + return kunit_destroy_resource(stream->test, kunit_resource_instance_match, - string_stream_free, stream); } diff --git a/lib/kunit/test.c b/lib/kunit/test.c index ccb2ffa..569b7f9 100644 --- a/lib/kunit/test.c +++ b/lib/kunit/test.c @@ -8,6 +8,7 @@ #include #include +#include #include #include "debugfs.h" @@ -406,90 +407,92 @@ void __kunit_test_suites_exit(struct kunit_suite **suites) } EXPORT_SYMBOL_GPL(__kunit_test_suites_exit); -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) +/* + * 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. + */ +int kunit_add_resource(struct kunit *test, + kunit_resource_init_t init, + kunit_resource_free_t free, + struct kunit_resource *res, + void *data) { - struct kunit_resource *res; - int ret; + int ret = 0; - res = kzalloc(sizeof(*res), internal_gfp); - if (!res) - return NULL; + res->free = free; + kref_init(&res->refcount); - ret = init(res, context); - if (ret) - return NULL; + if (init) { + ret = init(res, data); + if (ret) + return ret; + } else { + res->data = data; + } - res->free = free; spin_lock(&test->lock); list_add_tail(&res->node, &test->resources); + /* refcount for list is established by kref_init() */ spin_unlock(&test->lock); - return res; -} -EXPORT_SYMBOL_GPL(kunit_alloc_and_get_resource); - -static void kunit_resource_free(struct kunit *test, struct kunit_resource *res) -{ - res->free(res); - kfree(res); + return ret; } +EXPORT_SYMBOL_GPL(kunit_add_resource); -static struct kunit_resource *kunit_resource_find(struct kunit *test, - kunit_resource_match_t match, - kunit_resource_free_t free, - void *match_data) +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 *data) { - struct kunit_resource *resource; + struct kunit_resource *res; + int ret; - lockdep_assert_held(&test->lock); + res = kzalloc(sizeof(*res), internal_gfp); + if (!res) + return NULL; - list_for_each_entry_reverse(resource, &test->resources, node) { - if (resource->free != free) - continue; - if (match(test, resource->allocation, match_data)) - return resource; + ret = kunit_add_resource(test, init, free, res, data); + if (!ret) { + /* + * bump refcount for get; kunit_resource_put() should be called + * when done. + */ + kunit_get_resource(res); + return res; } - return NULL; } +EXPORT_SYMBOL_GPL(kunit_alloc_and_get_resource); -static struct kunit_resource *kunit_resource_remove( - struct kunit *test, - kunit_resource_match_t match, - kunit_resource_free_t free, - void *match_data) +void kunit_remove_resource(struct kunit *test, struct kunit_resource *res) { - struct kunit_resource *resource; - spin_lock(&test->lock); - resource = kunit_resource_find(test, match, free, match_data); - if (resource) - list_del(&resource->node); + list_del(&res->node); spin_unlock(&test->lock); - - return resource; + kunit_put_resource(res); } +EXPORT_SYMBOL_GPL(kunit_remove_resource); -int kunit_resource_destroy(struct kunit *test, - kunit_resource_match_t match, - kunit_resource_free_t free, +int kunit_destroy_resource(struct kunit *test, kunit_resource_match_t match, void *match_data) { - struct kunit_resource *resource; - - resource = kunit_resource_remove(test, match, free, match_data); + struct kunit_resource *res = kunit_find_resource(test, match, + match_data); - if (!resource) + if (!res) return -ENOENT; - kunit_resource_free(test, resource); + kunit_remove_resource(test, res); + + /* We have a reference also via _find(); drop it. */ + kunit_put_resource(res); + return 0; } -EXPORT_SYMBOL_GPL(kunit_resource_destroy); +EXPORT_SYMBOL_GPL(kunit_destroy_resource); struct kunit_kmalloc_params { size_t size; @@ -500,8 +503,8 @@ static int kunit_kmalloc_init(struct kunit_resource *res, void *context) { struct kunit_kmalloc_params *params = context; - res->allocation = kmalloc(params->size, params->gfp); - if (!res->allocation) + res->data = kmalloc(params->size, params->gfp); + if (!res->data) return -ENOMEM; return 0; @@ -509,7 +512,7 @@ static int kunit_kmalloc_init(struct kunit_resource *res, void *context) static void kunit_kmalloc_free(struct kunit_resource *res) { - kfree(res->allocation); + kfree(res->data); } void *kunit_kmalloc(struct kunit *test, size_t size, gfp_t gfp) @@ -529,20 +532,25 @@ void *kunit_kmalloc(struct kunit *test, size_t size, gfp_t gfp) void kunit_kfree(struct kunit *test, const void *ptr) { - int rc; + struct kunit_resource *res; - rc = kunit_resource_destroy(test, - kunit_resource_instance_match, - kunit_kmalloc_free, - (void *)ptr); + res = kunit_find_resource(test, kunit_resource_instance_match, + (void *)ptr); + + /* + * Removing the resource from the list of resources drops the + * reference count to 1; the final put will trigger the free. + */ + kunit_remove_resource(test, res); + + kunit_put_resource(res); - WARN_ON(rc); } EXPORT_SYMBOL_GPL(kunit_kfree); void kunit_cleanup(struct kunit *test) { - struct kunit_resource *resource; + struct kunit_resource *res; /* * test->resources is a stack - each allocation must be freed in the @@ -559,13 +567,16 @@ void kunit_cleanup(struct kunit *test) spin_unlock(&test->lock); break; } - resource = list_last_entry(&test->resources, - struct kunit_resource, - node); - list_del(&resource->node); + res = list_last_entry(&test->resources, + struct kunit_resource, + node); + /* + * Need to unlock here as a resource may remove another + * resource, and this can't happen if the test->lock + * is held. + */ spin_unlock(&test->lock); - - kunit_resource_free(test, resource); + kunit_remove_resource(test, res); } } EXPORT_SYMBOL_GPL(kunit_cleanup);