[PATCH v13 06/12] drm/ttm/tests: Add tests with mock resource managers
Thomas Hellström
thomas.hellstrom at linux.intel.com
Tue Jun 11 13:14:13 UTC 2024
On Mon, 2024-06-03 at 15:36 +0200, Karolina Stolarek wrote:
> Add mock resource manager to test ttm_bo_validate() with non-system
> placements. Update KConfig entry to enable DRM Buddy allocator, used
> by the mock manager. Update move function to do more than just assign
> a resource.
>
> Signed-off-by: Karolina Stolarek <karolina.stolarek at intel.com>
> Tested-by: Somalapuram, Amaranath <asomalap at amd.com>
> ---
> drivers/gpu/drm/Kconfig | 1 +
> drivers/gpu/drm/ttm/tests/Makefile | 1 +
> .../gpu/drm/ttm/tests/ttm_bo_validate_test.c | 273
> ++++++++++++++++++
> drivers/gpu/drm/ttm/tests/ttm_kunit_helpers.c | 32 +-
> drivers/gpu/drm/ttm/tests/ttm_mock_manager.c | 206 +++++++++++++
> drivers/gpu/drm/ttm/tests/ttm_mock_manager.h | 29 ++
> 6 files changed, 540 insertions(+), 2 deletions(-)
> create mode 100644 drivers/gpu/drm/ttm/tests/ttm_mock_manager.c
> create mode 100644 drivers/gpu/drm/ttm/tests/ttm_mock_manager.h
>
> diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig
> index 9703429de6b9..4c5cc517990b 100644
> --- a/drivers/gpu/drm/Kconfig
> +++ b/drivers/gpu/drm/Kconfig
> @@ -235,6 +235,7 @@ config DRM_TTM_KUNIT_TEST
> default n
> depends on DRM && KUNIT && MMU && (UML || COMPILE_TEST)
> select DRM_TTM
> + select DRM_BUDDY
> select DRM_EXPORT_FOR_TESTS if m
> select DRM_KUNIT_TEST_HELPERS
> default KUNIT_ALL_TESTS
> diff --git a/drivers/gpu/drm/ttm/tests/Makefile
> b/drivers/gpu/drm/ttm/tests/Makefile
> index 2e5ed63fb414..f3149de77541 100644
> --- a/drivers/gpu/drm/ttm/tests/Makefile
> +++ b/drivers/gpu/drm/ttm/tests/Makefile
> @@ -7,4 +7,5 @@ obj-$(CONFIG_DRM_TTM_KUNIT_TEST) += \
> ttm_tt_test.o \
> ttm_bo_test.o \
> ttm_bo_validate_test.o \
> + ttm_mock_manager.o \
> ttm_kunit_helpers.o
> diff --git a/drivers/gpu/drm/ttm/tests/ttm_bo_validate_test.c
> b/drivers/gpu/drm/ttm/tests/ttm_bo_validate_test.c
> index cc8346795f8d..68b088d58765 100644
> --- a/drivers/gpu/drm/ttm/tests/ttm_bo_validate_test.c
> +++ b/drivers/gpu/drm/ttm/tests/ttm_bo_validate_test.c
> @@ -8,12 +8,15 @@
> #include <drm/ttm/ttm_tt.h>
>
> #include "ttm_kunit_helpers.h"
> +#include "ttm_mock_manager.h"
>
> #define BO_SIZE SZ_4K
> +#define MANAGER_SIZE SZ_1M
>
> struct ttm_bo_validate_test_case {
> const char *description;
> enum ttm_bo_type bo_type;
> + u32 mem_type;
> bool with_ttm;
> };
>
> @@ -102,6 +105,49 @@ static void ttm_bo_init_reserved_sys_man(struct
> kunit *test)
> ttm_bo_put(bo);
> }
>
> +static void ttm_bo_init_reserved_mock_man(struct kunit *test)
> +{
> + const struct ttm_bo_validate_test_case *params = test-
> >param_value;
> + enum ttm_bo_type bo_type = params->bo_type;
> + struct ttm_test_devices *priv = test->priv;
> + u32 size = ALIGN(BO_SIZE, PAGE_SIZE);
> + struct ttm_operation_ctx ctx = { };
> + struct ttm_placement *placement;
> + u32 mem_type = TTM_PL_VRAM;
> + struct ttm_buffer_object *bo;
> + struct ttm_place *place;
> + int err;
> +
> + ttm_mock_manager_init(priv->ttm_dev, mem_type,
> MANAGER_SIZE);
> +
> + bo = kunit_kzalloc(test, sizeof(*bo), GFP_KERNEL);
> + KUNIT_ASSERT_NOT_NULL(test, bo);
> +
> + place = ttm_place_kunit_init(test, mem_type, 0);
> + placement = ttm_placement_kunit_init(test, place, 1);
> +
> + drm_gem_private_object_init(priv->drm, &bo->base, size);
> +
> + err = ttm_bo_init_reserved(priv->ttm_dev, bo, bo_type,
> placement,
> + PAGE_SIZE, &ctx, NULL, NULL,
> + &dummy_ttm_bo_destroy);
> + dma_resv_unlock(bo->base.resv);
> +
> + KUNIT_EXPECT_EQ(test, err, 0);
> + KUNIT_EXPECT_EQ(test, kref_read(&bo->kref), 1);
> + KUNIT_EXPECT_PTR_EQ(test, bo->bdev, priv->ttm_dev);
> + KUNIT_EXPECT_EQ(test, bo->type, bo_type);
> + KUNIT_EXPECT_EQ(test, ctx.bytes_moved, size);
> +
> + if (bo_type != ttm_bo_type_kernel)
> + KUNIT_EXPECT_TRUE(test,
> + drm_mm_node_allocated(&bo-
> >base.vma_node.vm_node));
> +
> + ttm_resource_free(bo, &bo->resource);
> + ttm_bo_put(bo);
> + ttm_mock_manager_fini(priv->ttm_dev, mem_type);
> +}
> +
> static void ttm_bo_init_reserved_resv(struct kunit *test)
> {
> enum ttm_bo_type bo_type = ttm_bo_type_device;
> @@ -136,6 +182,51 @@ static void ttm_bo_init_reserved_resv(struct
> kunit *test)
> ttm_bo_put(bo);
> }
>
> +static void ttm_bo_validate_basic(struct kunit *test)
> +{
> + const struct ttm_bo_validate_test_case *params = test-
> >param_value;
> + u32 fst_mem = TTM_PL_SYSTEM, snd_mem = TTM_PL_VRAM;
> + struct ttm_operation_ctx ctx_init = { }, ctx_val = { };
> + struct ttm_placement *fst_placement, *snd_placement;
> + struct ttm_test_devices *priv = test->priv;
> + struct ttm_place *fst_place, *snd_place;
> + u32 size = ALIGN(SZ_8K, PAGE_SIZE);
> + struct ttm_buffer_object *bo;
> + int err;
> +
> + ttm_mock_manager_init(priv->ttm_dev, snd_mem, MANAGER_SIZE);
> +
> + fst_place = ttm_place_kunit_init(test, fst_mem, 0);
> + fst_placement = ttm_placement_kunit_init(test, fst_place,
> 1);
> +
> + bo = kunit_kzalloc(test, sizeof(*bo), GFP_KERNEL);
> + KUNIT_ASSERT_NOT_NULL(test, bo);
> +
> + drm_gem_private_object_init(priv->drm, &bo->base, size);
> +
> + err = ttm_bo_init_reserved(priv->ttm_dev, bo, params-
> >bo_type,
> + fst_placement, PAGE_SIZE,
> &ctx_init, NULL,
> + NULL, &dummy_ttm_bo_destroy);
> + KUNIT_EXPECT_EQ(test, err, 0);
> +
> + snd_place = ttm_place_kunit_init(test, snd_mem,
> DRM_BUDDY_TOPDOWN_ALLOCATION);
> + snd_placement = ttm_placement_kunit_init(test, snd_place,
> 1);
> +
> + err = ttm_bo_validate(bo, snd_placement, &ctx_val);
> + dma_resv_unlock(bo->base.resv);
> +
> + KUNIT_EXPECT_EQ(test, err, 0);
> + KUNIT_EXPECT_EQ(test, ctx_val.bytes_moved, bo->base.size);
> + KUNIT_EXPECT_NOT_NULL(test, bo->ttm);
> + KUNIT_EXPECT_TRUE(test, ttm_tt_is_populated(bo->ttm));
> + KUNIT_EXPECT_EQ(test, bo->resource->mem_type, snd_mem);
> + KUNIT_EXPECT_EQ(test, bo->resource->placement,
> + DRM_BUDDY_TOPDOWN_ALLOCATION);
> +
> + ttm_bo_put(bo);
> + ttm_mock_manager_fini(priv->ttm_dev, snd_mem);
> +}
> +
> static void ttm_bo_validate_invalid_placement(struct kunit *test)
> {
> enum ttm_bo_type bo_type = ttm_bo_type_device;
> @@ -162,6 +253,36 @@ static void
> ttm_bo_validate_invalid_placement(struct kunit *test)
> ttm_bo_put(bo);
> }
>
> +static void ttm_bo_validate_failed_alloc(struct kunit *test)
> +{
> + enum ttm_bo_type bo_type = ttm_bo_type_device;
> + struct ttm_test_devices *priv = test->priv;
> + u32 size = ALIGN(BO_SIZE, PAGE_SIZE);
> + struct ttm_operation_ctx ctx = { };
> + struct ttm_placement *placement;
> + u32 mem_type = TTM_PL_VRAM;
> + struct ttm_buffer_object *bo;
> + struct ttm_place *place;
> + int err;
> +
> + bo = ttm_bo_kunit_init(test, test->priv, size, NULL);
> + bo->type = bo_type;
> +
> + ttm_bad_manager_init(priv->ttm_dev, mem_type, MANAGER_SIZE);
> +
> + place = ttm_place_kunit_init(test, mem_type, 0);
> + placement = ttm_placement_kunit_init(test, place, 1);
> +
> + ttm_bo_reserve(bo, false, false, NULL);
> + err = ttm_bo_validate(bo, placement, &ctx);
> + dma_resv_unlock(bo->base.resv);
> +
> + KUNIT_EXPECT_EQ(test, err, -ENOMEM);
> +
> + ttm_bo_put(bo);
> + ttm_bad_manager_fini(priv->ttm_dev, mem_type);
> +}
> +
> static void ttm_bo_validate_pinned(struct kunit *test)
> {
> enum ttm_bo_type bo_type = ttm_bo_type_device;
> @@ -193,11 +314,163 @@ static void ttm_bo_validate_pinned(struct
> kunit *test)
> ttm_bo_put(bo);
> }
>
> +static const struct ttm_bo_validate_test_case ttm_mem_type_cases[] =
> {
> + {
> + .description = "System manager",
> + .mem_type = TTM_PL_SYSTEM,
> + },
> + {
> + .description = "VRAM manager",
> + .mem_type = TTM_PL_VRAM,
> + },
> +};
> +
> +KUNIT_ARRAY_PARAM(ttm_bo_validate_mem, ttm_mem_type_cases,
> + ttm_bo_validate_case_desc);
> +
> +static void ttm_bo_validate_same_placement(struct kunit *test)
> +{
> + const struct ttm_bo_validate_test_case *params = test-
> >param_value;
> + struct ttm_operation_ctx ctx_init = { }, ctx_val = { };
> + struct ttm_test_devices *priv = test->priv;
> + u32 size = ALIGN(BO_SIZE, PAGE_SIZE);
> + struct ttm_placement *placement;
> + struct ttm_buffer_object *bo;
> + struct ttm_place *place;
> + int err;
> +
> + place = ttm_place_kunit_init(test, params->mem_type, 0);
> + placement = ttm_placement_kunit_init(test, place, 1);
> +
> + if (params->mem_type != TTM_PL_SYSTEM)
> + ttm_mock_manager_init(priv->ttm_dev, params-
> >mem_type, MANAGER_SIZE);
> +
> + bo = kunit_kzalloc(test, sizeof(*bo), GFP_KERNEL);
> + KUNIT_ASSERT_NOT_NULL(test, bo);
> +
> + drm_gem_private_object_init(priv->drm, &bo->base, size);
> +
> + err = ttm_bo_init_reserved(priv->ttm_dev, bo, params-
> >bo_type,
> + placement, PAGE_SIZE, &ctx_init,
> NULL,
> + NULL, &dummy_ttm_bo_destroy);
> + KUNIT_EXPECT_EQ(test, err, 0);
> +
> + err = ttm_bo_validate(bo, placement, &ctx_val);
> + dma_resv_unlock(bo->base.resv);
> +
> + KUNIT_EXPECT_EQ(test, err, 0);
> + KUNIT_EXPECT_EQ(test, ctx_val.bytes_moved, 0);
> +
> + ttm_bo_put(bo);
> +
> + if (params->mem_type != TTM_PL_SYSTEM)
> + ttm_mock_manager_fini(priv->ttm_dev, params-
> >mem_type);
> +}
> +
> +static void ttm_bo_validate_busy_placement(struct kunit *test)
> +{
> + u32 fst_mem = TTM_PL_VRAM, snd_mem = TTM_PL_VRAM + 1;
> + struct ttm_operation_ctx ctx_init = { }, ctx_val = { };
> + struct ttm_placement *placement_init, *placement_val;
> + enum ttm_bo_type bo_type = ttm_bo_type_device;
> + struct ttm_test_devices *priv = test->priv;
> + u32 size = ALIGN(BO_SIZE, PAGE_SIZE);
> + struct ttm_place *init_place, places[2];
> + struct ttm_resource_manager *man;
> + struct ttm_buffer_object *bo;
> + int err;
> +
> + ttm_bad_manager_init(priv->ttm_dev, fst_mem, MANAGER_SIZE);
> + ttm_mock_manager_init(priv->ttm_dev, snd_mem, MANAGER_SIZE);
> +
> + init_place = ttm_place_kunit_init(test, TTM_PL_SYSTEM, 0);
> + placement_init = ttm_placement_kunit_init(test, init_place,
> 1);
> +
> + bo = kunit_kzalloc(test, sizeof(*bo), GFP_KERNEL);
> + KUNIT_ASSERT_NOT_NULL(test, bo);
> +
> + drm_gem_private_object_init(priv->drm, &bo->base, size);
> +
> + err = ttm_bo_init_reserved(priv->ttm_dev, bo, bo_type,
> placement_init,
> + PAGE_SIZE, &ctx_init, NULL, NULL,
> + &dummy_ttm_bo_destroy);
> + KUNIT_EXPECT_EQ(test, err, 0);
> +
> + places[0] = (struct ttm_place){ .mem_type = fst_mem, .flags
> = TTM_PL_FLAG_DESIRED };
> + places[1] = (struct ttm_place){ .mem_type = snd_mem, .flags
> = TTM_PL_FLAG_FALLBACK };
> + placement_val = ttm_placement_kunit_init(test, places, 2);
> +
> + err = ttm_bo_validate(bo, placement_val, &ctx_val);
> + dma_resv_unlock(bo->base.resv);
> +
> + man = ttm_manager_type(priv->ttm_dev, snd_mem);
> +
> + KUNIT_EXPECT_EQ(test, err, 0);
> + KUNIT_EXPECT_EQ(test, ctx_val.bytes_moved, bo->base.size);
> + KUNIT_EXPECT_EQ(test, bo->resource->mem_type, snd_mem);
> + KUNIT_ASSERT_TRUE(test, list_is_singular(&man->lru[bo-
> >priority]));
> +
> + ttm_bo_put(bo);
> + ttm_bad_manager_fini(priv->ttm_dev, fst_mem);
> + ttm_mock_manager_fini(priv->ttm_dev, snd_mem);
> +}
> +
> +static void ttm_bo_validate_multihop(struct kunit *test)
> +{
> + const struct ttm_bo_validate_test_case *params = test-
> >param_value;
> + struct ttm_operation_ctx ctx_init = { }, ctx_val = { };
> + struct ttm_placement *placement_init, *placement_val;
> + u32 fst_mem = TTM_PL_VRAM, tmp_mem = TTM_PL_TT, final_mem =
> TTM_PL_SYSTEM;
> + struct ttm_test_devices *priv = test->priv;
> + struct ttm_place *fst_place, *final_place;
> + u32 size = ALIGN(BO_SIZE, PAGE_SIZE);
> + struct ttm_buffer_object *bo;
> + int err;
> +
> + ttm_mock_manager_init(priv->ttm_dev, fst_mem, MANAGER_SIZE);
> + ttm_mock_manager_init(priv->ttm_dev, tmp_mem, MANAGER_SIZE);
> +
> + fst_place = ttm_place_kunit_init(test, fst_mem, 0);
> + placement_init = ttm_placement_kunit_init(test, fst_place,
> 1);
> +
> + bo = kunit_kzalloc(test, sizeof(*bo), GFP_KERNEL);
> + KUNIT_ASSERT_NOT_NULL(test, bo);
> +
> + drm_gem_private_object_init(priv->drm, &bo->base, size);
> +
> + err = ttm_bo_init_reserved(priv->ttm_dev, bo, params-
> >bo_type,
> + placement_init, PAGE_SIZE,
> &ctx_init, NULL,
> + NULL, &dummy_ttm_bo_destroy);
> + KUNIT_EXPECT_EQ(test, err, 0);
> +
> + final_place = ttm_place_kunit_init(test, final_mem, 0);
> + placement_val = ttm_placement_kunit_init(test, final_place,
> 1);
> +
> + err = ttm_bo_validate(bo, placement_val, &ctx_val);
> + dma_resv_unlock(bo->base.resv);
> +
> + KUNIT_EXPECT_EQ(test, err, 0);
> + KUNIT_EXPECT_EQ(test, ctx_val.bytes_moved, size * 2);
> + KUNIT_EXPECT_EQ(test, bo->resource->mem_type, final_mem);
> +
> + ttm_bo_put(bo);
> +
> + ttm_mock_manager_fini(priv->ttm_dev, fst_mem);
> + ttm_mock_manager_fini(priv->ttm_dev, tmp_mem);
> +}
> +
> static struct kunit_case ttm_bo_validate_test_cases[] = {
> KUNIT_CASE_PARAM(ttm_bo_init_reserved_sys_man,
> ttm_bo_types_gen_params),
> + KUNIT_CASE_PARAM(ttm_bo_init_reserved_mock_man,
> ttm_bo_types_gen_params),
> KUNIT_CASE(ttm_bo_init_reserved_resv),
> + KUNIT_CASE_PARAM(ttm_bo_validate_basic,
> ttm_bo_types_gen_params),
> KUNIT_CASE(ttm_bo_validate_invalid_placement),
> + KUNIT_CASE_PARAM(ttm_bo_validate_same_placement,
> + ttm_bo_validate_mem_gen_params),
> + KUNIT_CASE(ttm_bo_validate_failed_alloc),
> KUNIT_CASE(ttm_bo_validate_pinned),
> + KUNIT_CASE(ttm_bo_validate_busy_placement),
> + KUNIT_CASE_PARAM(ttm_bo_validate_multihop,
> ttm_bo_types_gen_params),
> {}
> };
>
> diff --git a/drivers/gpu/drm/ttm/tests/ttm_kunit_helpers.c
> b/drivers/gpu/drm/ttm/tests/ttm_kunit_helpers.c
> index 2f590bae53f8..cb1480e44495 100644
> --- a/drivers/gpu/drm/ttm/tests/ttm_kunit_helpers.c
> +++ b/drivers/gpu/drm/ttm/tests/ttm_kunit_helpers.c
> @@ -27,8 +27,36 @@ static int mock_move(struct ttm_buffer_object *bo,
> bool evict,
> struct ttm_resource *new_mem,
> struct ttm_place *hop)
> {
> - bo->resource = new_mem;
> - return 0;
> + 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) {
> + ttm_bo_move_null(bo, new_mem);
> + return 0;
> + }
> +
> + if (old_mem->mem_type == TTM_PL_TT &&
> + new_mem->mem_type == TTM_PL_SYSTEM) {
> + ttm_resource_free(bo, &bo->resource);
> + ttm_bo_assign_mem(bo, new_mem);
This above is equivalent to ttm_bo_move_null(). Replace or coalesce
with the if-statement above.
With that,
Reviewed-by: Thomas Hellström <thomas.hellstrom at linux.intel.com>
Please also send last version to the intel-xe list. IIRC that will
trigger the KUNIT run with the new subtests!
Thanks,
Thomas
> + return 0;
> + }
> +
> + return ttm_bo_move_memcpy(bo, ctx, new_mem);
> }
>
> struct ttm_device_funcs ttm_dev_funcs = {
> diff --git a/drivers/gpu/drm/ttm/tests/ttm_mock_manager.c
> b/drivers/gpu/drm/ttm/tests/ttm_mock_manager.c
> new file mode 100644
> index 000000000000..ad77816c13ca
> --- /dev/null
> +++ b/drivers/gpu/drm/ttm/tests/ttm_mock_manager.c
> @@ -0,0 +1,206 @@
> +// SPDX-License-Identifier: GPL-2.0 AND MIT
> +/*
> + * Copyright © 2023 Intel Corporation
> + */
> +#include <drm/ttm/ttm_resource.h>
> +#include <drm/ttm/ttm_device.h>
> +#include <drm/ttm/ttm_placement.h>
> +
> +#include "ttm_mock_manager.h"
> +
> +static inline struct ttm_mock_manager *
> +to_mock_mgr(struct ttm_resource_manager *man)
> +{
> + return container_of(man, struct ttm_mock_manager, man);
> +}
> +
> +static inline struct ttm_mock_resource *
> +to_mock_mgr_resource(struct ttm_resource *res)
> +{
> + return container_of(res, struct ttm_mock_resource, base);
> +}
> +
> +static int ttm_mock_manager_alloc(struct ttm_resource_manager *man,
> + struct ttm_buffer_object *bo,
> + const struct ttm_place *place,
> + struct ttm_resource **res)
> +{
> + struct ttm_mock_manager *manager = to_mock_mgr(man);
> + struct ttm_mock_resource *mock_res;
> + struct drm_buddy *mm = &manager->mm;
> + u64 lpfn, fpfn, alloc_size;
> + int err;
> +
> + mock_res = kzalloc(sizeof(*mock_res), GFP_KERNEL);
> +
> + if (!mock_res)
> + return -ENOMEM;
> +
> + fpfn = 0;
> + lpfn = man->size;
> +
> + ttm_resource_init(bo, place, &mock_res->base);
> + INIT_LIST_HEAD(&mock_res->blocks);
> +
> + if (place->flags & TTM_PL_FLAG_TOPDOWN)
> + mock_res->flags |= DRM_BUDDY_TOPDOWN_ALLOCATION;
> +
> + if (place->flags & TTM_PL_FLAG_CONTIGUOUS)
> + mock_res->flags |= DRM_BUDDY_CONTIGUOUS_ALLOCATION;
> +
> + alloc_size = (uint64_t)mock_res->base.size;
> + mutex_lock(&manager->lock);
> + err = drm_buddy_alloc_blocks(mm, fpfn, lpfn, alloc_size,
> + manager->default_page_size,
> + &mock_res->blocks,
> + mock_res->flags);
> +
> + if (err)
> + goto error_free_blocks;
> + mutex_unlock(&manager->lock);
> +
> + *res = &mock_res->base;
> + return 0;
> +
> +error_free_blocks:
> + drm_buddy_free_list(mm, &mock_res->blocks, 0);
> + ttm_resource_fini(man, &mock_res->base);
> + mutex_unlock(&manager->lock);
> +
> + return err;
> +}
> +
> +static void ttm_mock_manager_free(struct ttm_resource_manager *man,
> + struct ttm_resource *res)
> +{
> + struct ttm_mock_manager *manager = to_mock_mgr(man);
> + struct ttm_mock_resource *mock_res =
> to_mock_mgr_resource(res);
> + struct drm_buddy *mm = &manager->mm;
> +
> + mutex_lock(&manager->lock);
> + drm_buddy_free_list(mm, &mock_res->blocks, 0);
> + mutex_unlock(&manager->lock);
> +
> + ttm_resource_fini(man, res);
> + kfree(mock_res);
> +}
> +
> +static const struct ttm_resource_manager_func ttm_mock_manager_funcs
> = {
> + .alloc = ttm_mock_manager_alloc,
> + .free = ttm_mock_manager_free,
> +};
> +
> +int ttm_mock_manager_init(struct ttm_device *bdev, u32 mem_type, u32
> size)
> +{
> + struct ttm_mock_manager *manager;
> + struct ttm_resource_manager *base;
> + int err;
> +
> + manager = kzalloc(sizeof(*manager), GFP_KERNEL);
> + if (!manager)
> + return -ENOMEM;
> +
> + mutex_init(&manager->lock);
> +
> + err = drm_buddy_init(&manager->mm, size, PAGE_SIZE);
> +
> + if (err) {
> + kfree(manager);
> + return err;
> + }
> +
> + manager->default_page_size = PAGE_SIZE;
> + base = &manager->man;
> + base->func = &ttm_mock_manager_funcs;
> + base->use_tt = true;
> +
> + ttm_resource_manager_init(base, bdev, size);
> + ttm_set_driver_manager(bdev, mem_type, base);
> + ttm_resource_manager_set_used(base, true);
> +
> + return 0;
> +}
> +EXPORT_SYMBOL_GPL(ttm_mock_manager_init);
> +
> +void ttm_mock_manager_fini(struct ttm_device *bdev, u32 mem_type)
> +{
> + struct ttm_resource_manager *man;
> + struct ttm_mock_manager *mock_man;
> + int err;
> +
> + man = ttm_manager_type(bdev, mem_type);
> + mock_man = to_mock_mgr(man);
> +
> + err = ttm_resource_manager_evict_all(bdev, man);
> + if (err)
> + return;
> +
> + ttm_resource_manager_set_used(man, false);
> +
> + mutex_lock(&mock_man->lock);
> + drm_buddy_fini(&mock_man->mm);
> + mutex_unlock(&mock_man->lock);
> +
> + ttm_set_driver_manager(bdev, mem_type, NULL);
> +}
> +EXPORT_SYMBOL_GPL(ttm_mock_manager_fini);
> +
> +static int ttm_bad_manager_alloc(struct ttm_resource_manager *man,
> + struct ttm_buffer_object *bo,
> + const struct ttm_place *place,
> + struct ttm_resource **res)
> +{
> + return -ENOSPC;
> +}
> +
> +static void ttm_bad_manager_free(struct ttm_resource_manager *man,
> + struct ttm_resource *res)
> +{
> +}
> +
> +static bool ttm_bad_manager_compatible(struct ttm_resource_manager
> *man,
> + struct ttm_resource *res,
> + const struct ttm_place
> *place,
> + size_t size)
> +{
> + return true;
> +}
> +
> +static const struct ttm_resource_manager_func ttm_bad_manager_funcs
> = {
> + .alloc = ttm_bad_manager_alloc,
> + .free = ttm_bad_manager_free,
> + .compatible = ttm_bad_manager_compatible
> +};
> +
> +int ttm_bad_manager_init(struct ttm_device *bdev, u32 mem_type, u32
> size)
> +{
> + struct ttm_resource_manager *man;
> +
> + man = kzalloc(sizeof(*man), GFP_KERNEL);
> + if (!man)
> + return -ENOMEM;
> +
> + man->func = &ttm_bad_manager_funcs;
> +
> + ttm_resource_manager_init(man, bdev, size);
> + ttm_set_driver_manager(bdev, mem_type, man);
> + ttm_resource_manager_set_used(man, true);
> +
> + return 0;
> +}
> +EXPORT_SYMBOL_GPL(ttm_bad_manager_init);
> +
> +void ttm_bad_manager_fini(struct ttm_device *bdev, u32 mem_type)
> +{
> + struct ttm_resource_manager *man;
> +
> + man = ttm_manager_type(bdev, mem_type);
> +
> + ttm_resource_manager_set_used(man, false);
> + ttm_set_driver_manager(bdev, mem_type, NULL);
> +
> + kfree(man);
> +}
> +EXPORT_SYMBOL_GPL(ttm_bad_manager_fini);
> +
> +MODULE_LICENSE("GPL and additional rights");
> diff --git a/drivers/gpu/drm/ttm/tests/ttm_mock_manager.h
> b/drivers/gpu/drm/ttm/tests/ttm_mock_manager.h
> new file mode 100644
> index 000000000000..5456aaec118b
> --- /dev/null
> +++ b/drivers/gpu/drm/ttm/tests/ttm_mock_manager.h
> @@ -0,0 +1,29 @@
> +/* SPDX-License-Identifier: GPL-2.0 AND MIT */
> +/*
> + * Copyright © 2023 Intel Corporation
> + */
> +#ifndef TTM_MOCK_MANAGER_H
> +#define TTM_MOCK_MANAGER_H
> +
> +#include <drm/drm_buddy.h>
> +
> +struct ttm_mock_manager {
> + struct ttm_resource_manager man;
> + struct drm_buddy mm;
> + u64 default_page_size;
> + /* protects allocations of mock buffer objects */
> + struct mutex lock;
> +};
> +
> +struct ttm_mock_resource {
> + struct ttm_resource base;
> + struct list_head blocks;
> + unsigned long flags;
> +};
> +
> +int ttm_mock_manager_init(struct ttm_device *bdev, u32 mem_type, u32
> size);
> +int ttm_bad_manager_init(struct ttm_device *bdev, u32 mem_type, u32
> size);
> +void ttm_mock_manager_fini(struct ttm_device *bdev, u32 mem_type);
> +void ttm_bad_manager_fini(struct ttm_device *bdev, u32 mem_type);
> +
> +#endif // TTM_MOCK_MANAGER_H
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