1 files changed, 304 insertions, 0 deletions
diff --git a/drivers/gpu/drm/ttm/tests/ttm_kunit_helpers.c b/drivers/gpu/drm/ttm/tests/ttm_kunit_helpers.c
new file mode 100644
index 000000000000..7b533e4e1e04
--- /dev/null
+++ b/drivers/gpu/drm/ttm/tests/ttm_kunit_helpers.c
@@ -0,0 +1,304 @@
+// SPDX-License-Identifier: GPL-2.0 AND MIT
+/*
+ * Copyright © 2023 Intel Corporation
+ */
+
+#include <linux/export.h>
+
+#include <drm/ttm/ttm_tt.h>
+
+#include "ttm_kunit_helpers.h"
+
+static const struct ttm_place sys_place = {
+	.fpfn = 0,
+	.lpfn = 0,
+	.mem_type = TTM_PL_SYSTEM,
+	.flags = TTM_PL_FLAG_FALLBACK,
+};
+
+static const struct ttm_place mock1_place = {
+	.fpfn = 0,
+	.lpfn = 0,
+	.mem_type = TTM_PL_MOCK1,
+	.flags = TTM_PL_FLAG_FALLBACK,
+};
+
+static const struct ttm_place mock2_place = {
+	.fpfn = 0,
+	.lpfn = 0,
+	.mem_type = TTM_PL_MOCK2,
+	.flags = TTM_PL_FLAG_FALLBACK,
+};
+
+static struct ttm_placement sys_placement = {
+	.num_placement = 1,
+	.placement = &sys_place,
+};
+
+static struct ttm_placement bad_placement = {
+	.num_placement = 1,
+	.placement = &mock1_place,
+};
+
+static struct ttm_placement mock_placement = {
+	.num_placement = 1,
+	.placement = &mock2_place,
+};
+
+static struct ttm_tt *ttm_tt_simple_create(struct ttm_buffer_object *bo, u32 page_flags)
+{
+	struct ttm_tt *tt;
+
+	tt = kzalloc(sizeof(*tt), GFP_KERNEL);
+	ttm_tt_init(tt, bo, page_flags, ttm_cached, 0);
+
+	return tt;
+}
+
+static void ttm_tt_simple_destroy(struct ttm_device *bdev, struct ttm_tt *ttm)
+{
+	kfree(ttm);
+}
+
+static int mock_move(struct ttm_buffer_object *bo, bool evict,
+		     struct ttm_operation_ctx *ctx,
+		     struct ttm_resource *new_mem,
+		     struct ttm_place *hop)
+{
+	struct ttm_resource *old_mem = bo->resource;
+
+	if (!old_mem || (old_mem->mem_type == TTM_PL_SYSTEM && !bo->ttm)) {
+		ttm_bo_move_null(bo, new_mem);
+		return 0;
+	}
+
+	if (bo->resource->mem_type == TTM_PL_VRAM &&
+	    new_mem->mem_type == TTM_PL_SYSTEM) {
+		hop->mem_type = TTM_PL_TT;
+		hop->flags = TTM_PL_FLAG_TEMPORARY;
+		hop->fpfn = 0;
+		hop->lpfn = 0;
+		return -EMULTIHOP;
+	}
+
+	if ((old_mem->mem_type == TTM_PL_SYSTEM &&
+	     new_mem->mem_type == TTM_PL_TT) ||
+	    (old_mem->mem_type == TTM_PL_TT &&
+	     new_mem->mem_type == TTM_PL_SYSTEM)) {
+		ttm_bo_move_null(bo, new_mem);
+		return 0;
+	}
+
+	return ttm_bo_move_memcpy(bo, ctx, new_mem);
+}
+
+static void mock_evict_flags(struct ttm_buffer_object *bo,
+			     struct ttm_placement *placement)
+{
+	switch (bo->resource->mem_type) {
+	case TTM_PL_VRAM:
+	case TTM_PL_SYSTEM:
+		*placement = sys_placement;
+		break;
+	case TTM_PL_TT:
+		*placement = mock_placement;
+		break;
+	case TTM_PL_MOCK1:
+		/* Purge objects coming from this domain */
+		break;
+	}
+}
+
+static void bad_evict_flags(struct ttm_buffer_object *bo,
+			    struct ttm_placement *placement)
+{
+	*placement = bad_placement;
+}
+
+static int ttm_device_kunit_init_with_funcs(struct ttm_test_devices *priv,
+					    struct ttm_device *ttm,
+					    unsigned int alloc_flags,
+					    struct ttm_device_funcs *funcs)
+{
+	struct drm_device *drm = priv->drm;
+	int err;
+
+	err = ttm_device_init(ttm, funcs, drm->dev,
+			      drm->anon_inode->i_mapping,
+			      drm->vma_offset_manager,
+			      alloc_flags);
+
+	return err;
+}
+
+struct ttm_device_funcs ttm_dev_funcs = {
+	.ttm_tt_create = ttm_tt_simple_create,
+	.ttm_tt_destroy = ttm_tt_simple_destroy,
+	.move = mock_move,
+	.eviction_valuable = ttm_bo_eviction_valuable,
+	.evict_flags = mock_evict_flags,
+};
+EXPORT_SYMBOL_GPL(ttm_dev_funcs);
+
+int ttm_device_kunit_init(struct ttm_test_devices *priv,
+			  struct ttm_device *ttm,
+			  unsigned int alloc_flags)
+{
+	return ttm_device_kunit_init_with_funcs(priv, ttm, alloc_flags,
+						&ttm_dev_funcs);
+}
+EXPORT_SYMBOL_GPL(ttm_device_kunit_init);
+
+struct ttm_device_funcs ttm_dev_funcs_bad_evict = {
+	.ttm_tt_create = ttm_tt_simple_create,
+	.ttm_tt_destroy = ttm_tt_simple_destroy,
+	.move = mock_move,
+	.eviction_valuable = ttm_bo_eviction_valuable,
+	.evict_flags = bad_evict_flags,
+};
+EXPORT_SYMBOL_GPL(ttm_dev_funcs_bad_evict);
+
+int ttm_device_kunit_init_bad_evict(struct ttm_test_devices *priv,
+				    struct ttm_device *ttm)
+{
+	return ttm_device_kunit_init_with_funcs(priv, ttm, 0,
+						&ttm_dev_funcs_bad_evict);
+}
+EXPORT_SYMBOL_GPL(ttm_device_kunit_init_bad_evict);
+
+struct ttm_buffer_object *ttm_bo_kunit_init(struct kunit *test,
+					    struct ttm_test_devices *devs,
+					    size_t size,
+					    struct dma_resv *obj)
+{
+	struct drm_gem_object gem_obj = { };
+	struct ttm_buffer_object *bo;
+	int err;
+
+	bo = kunit_kzalloc(test, sizeof(*bo), GFP_KERNEL);
+	KUNIT_ASSERT_NOT_NULL(test, bo);
+
+	bo->base = gem_obj;
+
+	if (obj)
+		bo->base.resv = obj;
+
+	err = drm_gem_object_init(devs->drm, &bo->base, size);
+	KUNIT_ASSERT_EQ(test, err, 0);
+
+	bo->bdev = devs->ttm_dev;
+	bo->destroy = dummy_ttm_bo_destroy;
+
+	kref_init(&bo->kref);
+
+	return bo;
+}
+EXPORT_SYMBOL_GPL(ttm_bo_kunit_init);
+
+struct ttm_place *ttm_place_kunit_init(struct kunit *test, u32 mem_type, u32 flags)
+{
+	struct ttm_place *place;
+
+	place = kunit_kzalloc(test, sizeof(*place), GFP_KERNEL);
+	KUNIT_ASSERT_NOT_NULL(test, place);
+
+	place->mem_type = mem_type;
+	place->flags = flags;
+
+	return place;
+}
+EXPORT_SYMBOL_GPL(ttm_place_kunit_init);
+
+void dummy_ttm_bo_destroy(struct ttm_buffer_object *bo)
+{
+	drm_gem_object_release(&bo->base);
+}
+EXPORT_SYMBOL_GPL(dummy_ttm_bo_destroy);
+
+struct ttm_test_devices *ttm_test_devices_basic(struct kunit *test)
+{
+	struct ttm_test_devices *devs;
+
+	devs = kunit_kzalloc(test, sizeof(*devs), GFP_KERNEL);
+	KUNIT_ASSERT_NOT_NULL(test, devs);
+
+	devs->dev = drm_kunit_helper_alloc_device(test);
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, devs->dev);
+
+	/* Set mask for alloc_coherent mappings to enable ttm_pool_alloc testing */
+	devs->dev->coherent_dma_mask = -1;
+
+	devs->drm = __drm_kunit_helper_alloc_drm_device(test, devs->dev,
+							sizeof(*devs->drm), 0,
+							DRIVER_GEM);
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, devs->drm);
+
+	return devs;
+}
+EXPORT_SYMBOL_GPL(ttm_test_devices_basic);
+
+struct ttm_test_devices *ttm_test_devices_all(struct kunit *test)
+{
+	struct ttm_test_devices *devs;
+	struct ttm_device *ttm_dev;
+	int err;
+
+	devs = ttm_test_devices_basic(test);
+
+	ttm_dev = kunit_kzalloc(test, sizeof(*ttm_dev), GFP_KERNEL);
+	KUNIT_ASSERT_NOT_NULL(test, ttm_dev);
+
+	err = ttm_device_kunit_init(devs, ttm_dev, 0);
+	KUNIT_ASSERT_EQ(test, err, 0);
+
+	devs->ttm_dev = ttm_dev;
+
+	return devs;
+}
+EXPORT_SYMBOL_GPL(ttm_test_devices_all);
+
+void ttm_test_devices_put(struct kunit *test, struct ttm_test_devices *devs)
+{
+	if (devs->ttm_dev)
+		ttm_device_fini(devs->ttm_dev);
+
+	drm_kunit_helper_free_device(test, devs->dev);
+}
+EXPORT_SYMBOL_GPL(ttm_test_devices_put);
+
+int ttm_test_devices_init(struct kunit *test)
+{
+	struct ttm_test_devices *priv;
+
+	priv = kunit_kzalloc(test, sizeof(*priv), GFP_KERNEL);
+	KUNIT_ASSERT_NOT_NULL(test, priv);
+
+	priv = ttm_test_devices_basic(test);
+	test->priv = priv;
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(ttm_test_devices_init);
+
+int ttm_test_devices_all_init(struct kunit *test)
+{
+	struct ttm_test_devices *priv;
+
+	priv = kunit_kzalloc(test, sizeof(*priv), GFP_KERNEL);
+	KUNIT_ASSERT_NOT_NULL(test, priv);
+
+	priv = ttm_test_devices_all(test);
+	test->priv = priv;
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(ttm_test_devices_all_init);
+
+void ttm_test_devices_fini(struct kunit *test)
+{
+	ttm_test_devices_put(test, test->priv);
+}
+EXPORT_SYMBOL_GPL(ttm_test_devices_fini);
+
+MODULE_DESCRIPTION("TTM KUnit test helper functions");
+MODULE_LICENSE("GPL and additional rights");