linux-kernel - [PATCH v2 05/11] drm/tests: helpers: Create a helper to allocate a locking ctx

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Message-Id: <20230720-kms-kunit-actions-rework-v2-5-175017bd56ab@kernel.org>
Date:   Thu, 20 Jul 2023 13:15:50 +0200
From:   Maxime Ripard <mripard@...nel.org>
To:     David Airlie <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Emma Anholt <emma@...olt.net>
Cc:     Maíra Canal <mairacanal@...eup.net>,
        Javier Martinez Canillas <javierm@...hat.com>,
        dri-devel@...ts.freedesktop.org, David Gow <davidgow@...gle.com>,
        linux-kselftest@...r.kernel.org, kunit-dev@...glegroups.com,
        linux-kernel@...r.kernel.org, Maxime Ripard <mripard@...nel.org>,
        Brendan Higgins <brendan.higgins@...ux.dev>
Subject: [PATCH v2 05/11] drm/tests: helpers: Create a helper to allocate a
 locking ctx

As we get more and more tests, the locking context initialisation
creates more and more boilerplate, both at creation and destruction.

Let's create a helper that will allocate, initialise a context, and
register kunit actions to clean up once the test is done.

Reviewed-by: Javier Martinez Canillas <javierm@...hat.com>
Signed-off-by: Maxime Ripard <mripard@...nel.org>
---
 drivers/gpu/drm/tests/drm_kunit_helpers.c | 41 +++++++++++++++++++++++++++++++
 include/drm/drm_kunit_helpers.h           |  2 ++
 2 files changed, 43 insertions(+)

diff --git a/drivers/gpu/drm/tests/drm_kunit_helpers.c b/drivers/gpu/drm/tests/drm_kunit_helpers.c
index 5856beb7f7d7..5130d4553262 100644
--- a/drivers/gpu/drm/tests/drm_kunit_helpers.c
+++ b/drivers/gpu/drm/tests/drm_kunit_helpers.c
@@ -120,5 +120,46 @@ __drm_kunit_helper_alloc_drm_device_with_driver(struct kunit *test,
 }
 EXPORT_SYMBOL_GPL(__drm_kunit_helper_alloc_drm_device_with_driver);
 
+static void action_drm_release_context(void *ptr)
+{
+	struct drm_modeset_acquire_ctx *ctx = ptr;
+
+	drm_modeset_drop_locks(ctx);
+	drm_modeset_acquire_fini(ctx);
+}
+
+/**
+ * drm_kunit_helper_context_alloc - Allocates an acquire context
+ * @test: The test context object
+ *
+ * Allocates and initializes a modeset acquire context.
+ *
+ * The context is tied to the kunit test context, so we must not call
+ * drm_modeset_acquire_fini() on it, it will be done so automatically.
+ *
+ * Returns:
+ * An ERR_PTR on error, a pointer to the newly allocated context otherwise
+ */
+struct drm_modeset_acquire_ctx *
+drm_kunit_helper_acquire_ctx_alloc(struct kunit *test)
+{
+	struct drm_modeset_acquire_ctx *ctx;
+	int ret;
+
+	ctx = kunit_kzalloc(test, sizeof(*ctx), GFP_KERNEL);
+	KUNIT_ASSERT_NOT_NULL(test, ctx);
+
+	drm_modeset_acquire_init(ctx, 0);
+
+	ret = kunit_add_action_or_reset(test,
+					action_drm_release_context,
+					ctx);
+	if (ret)
+		return ERR_PTR(ret);
+
+	return ctx;
+}
+EXPORT_SYMBOL_GPL(drm_kunit_helper_acquire_ctx_alloc);
+
 MODULE_AUTHOR("Maxime Ripard <maxime@...no.tech>");
 MODULE_LICENSE("GPL");
diff --git a/include/drm/drm_kunit_helpers.h b/include/drm/drm_kunit_helpers.h
index ed013fdcc1ff..4ba5e10653c6 100644
--- a/include/drm/drm_kunit_helpers.h
+++ b/include/drm/drm_kunit_helpers.h
@@ -87,5 +87,7 @@ __drm_kunit_helper_alloc_drm_device(struct kunit *test,
 						      sizeof(_type),		\
 						      offsetof(_type, _member),	\
 						      _feat))
+struct drm_modeset_acquire_ctx *
+drm_kunit_helper_acquire_ctx_alloc(struct kunit *test);
 
 #endif // DRM_KUNIT_HELPERS_H_

-- 
2.41.0