[RFC PATCH] drm/test: add a test suite for GEM objects backed by shmem
Maxime Ripard
mripard at kernel.org
Tue Oct 24 09:23:42 UTC 2023
Hi Marco,
On Mon, Oct 23, 2023 at 06:45:40PM +0200, Marco Pagani wrote:
> This patch introduces an initial KUnit test suite for GEM objects
> backed by shmem buffers.
>
> Signed-off-by: Marco Pagani <marpagan at redhat.com>
> ---
> drivers/gpu/drm/Kconfig | 1 +
> drivers/gpu/drm/tests/Makefile | 3 +-
> drivers/gpu/drm/tests/drm_gem_shmem_test.c | 303 +++++++++++++++++++++
> 3 files changed, 306 insertions(+), 1 deletion(-)
> create mode 100644 drivers/gpu/drm/tests/drm_gem_shmem_test.c
>
> diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig
> index 3eee8636f847..f0a77e3e04d7 100644
> --- a/drivers/gpu/drm/Kconfig
> +++ b/drivers/gpu/drm/Kconfig
> @@ -84,6 +84,7 @@ config DRM_KUNIT_TEST
> select DRM_EXPORT_FOR_TESTS if m
> select DRM_KUNIT_TEST_HELPERS
> select DRM_EXEC
> + select DRM_GEM_SHMEM_HELPER
I know that DRM_EXEC already stands out, but these should be ordered
alphabetically, so it should be before DRM_KUNIT_TEST_HELPERS.
> default KUNIT_ALL_TESTS
> help
> This builds unit tests for DRM. This option is not useful for
> diff --git a/drivers/gpu/drm/tests/Makefile b/drivers/gpu/drm/tests/Makefile
> index ba7baa622675..b8227aab369e 100644
> --- a/drivers/gpu/drm/tests/Makefile
> +++ b/drivers/gpu/drm/tests/Makefile
> @@ -18,6 +18,7 @@ obj-$(CONFIG_DRM_KUNIT_TEST) += \
> drm_plane_helper_test.o \
> drm_probe_helper_test.o \
> drm_rect_test.o \
> - drm_exec_test.o
> + drm_exec_test.o \
> + drm_gem_shmem_test.o
Ditto.
> CFLAGS_drm_mm_test.o := $(DISABLE_STRUCTLEAK_PLUGIN)
> diff --git a/drivers/gpu/drm/tests/drm_gem_shmem_test.c b/drivers/gpu/drm/tests/drm_gem_shmem_test.c
> new file mode 100644
> index 000000000000..0bf6727f08d2
> --- /dev/null
> +++ b/drivers/gpu/drm/tests/drm_gem_shmem_test.c
> @@ -0,0 +1,303 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * KUnit test suite for GEM objects backed by shmem buffers
> + *
> + * Copyright (C) 2023 Red Hat, Inc.
> + *
> + * Author: Marco Pagani <marpagan at redhat.com>
> + */
> +
> +#include <linux/dma-buf.h>
> +#include <linux/iosys-map.h>
> +#include <linux/sizes.h>
> +
> +#include <kunit/test.h>
> +
> +#include <drm/drm_device.h>
> +#include <drm/drm_drv.h>
> +#include <drm/drm_gem.h>
> +#include <drm/drm_gem_shmem_helper.h>
> +#include <drm/drm_kunit_helpers.h>
> +
> +#define TEST_SIZE SZ_1M
> +#define TEST_BYTE 0xae
> +
> +struct fake_dev {
> + struct drm_device drm_dev;
> + struct device *dev;
> +};
> +
> +/* Test creating a shmem GEM object */
> +static void drm_gem_shmem_test_obj_create(struct kunit *test)
> +{
> + struct fake_dev *fdev = test->priv;
> + struct drm_gem_shmem_object *shmem;
> +
> + shmem = drm_gem_shmem_create(&fdev->drm_dev, TEST_SIZE);
> + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, shmem);
> + KUNIT_ASSERT_EQ(test, shmem->base.size, TEST_SIZE);
> + KUNIT_ASSERT_NOT_NULL(test, shmem->base.filp);
> + KUNIT_ASSERT_NOT_NULL(test, shmem->base.funcs);
> +
> + drm_gem_shmem_free(shmem);
> +}
> +
> +/* Test creating a private shmem GEM object from a scatter/gather table */
Thanks for documenting those tests. I believe we should also document
what we expect from the test: should the test succeed? fail? if it
fails, what is the cause of failure?
Based on the following test, I think something like the following would
be good:
Test that creating a private shmem GEM object from a previously
allocated sg_table succeeds and is properly initialized
Feel free to change it to something else if you find something missing.
> +static void drm_gem_shmem_test_obj_create_private(struct kunit *test)
> +{
> + struct fake_dev *fdev = test->priv;
> + struct drm_gem_shmem_object *shmem;
> + struct drm_gem_object *gem_obj;
> + struct dma_buf buf_mock;
> + struct dma_buf_attachment attach_mock;
> + struct sg_table *sgt;
> + char *buf;
> + int ret;
> +
> + /* Create a mock scatter/gather table */
> + buf = kunit_kzalloc(test, TEST_SIZE, GFP_KERNEL);
> + KUNIT_ASSERT_NOT_NULL(test, buf);
> +
> + sgt = kzalloc(sizeof(*sgt), GFP_KERNEL);
> + KUNIT_ASSERT_NOT_NULL(test, sgt);
> +
> + ret = sg_alloc_table(sgt, 1, GFP_KERNEL);
> + KUNIT_ASSERT_EQ(test, ret, 0);
> + sg_init_one(sgt->sgl, buf, TEST_SIZE);
> +
> + /* Init a mock DMA-BUF */
> + buf_mock.size = TEST_SIZE;
> + attach_mock.dmabuf = &buf_mock;
> +
> + gem_obj = drm_gem_shmem_prime_import_sg_table(&fdev->drm_dev, &attach_mock, sgt);
> + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, gem_obj);
> + KUNIT_ASSERT_EQ(test, gem_obj->size, TEST_SIZE);
> + KUNIT_ASSERT_NULL(test, gem_obj->filp);
> + KUNIT_ASSERT_NOT_NULL(test, gem_obj->funcs);
> +
> + shmem = to_drm_gem_shmem_obj(gem_obj);
> + KUNIT_ASSERT_PTR_EQ(test, shmem->sgt, sgt);
> +
> + /* The scatter/gather table is freed by drm_gem_shmem_free */
> + drm_gem_shmem_free(shmem);
> +}
KUNIT_ASSERT_* will stop the execution of the test on failure, you
should probably use a bit more of KUNIT_EXPECT_* calls otherwise you'll
leak resources.
You also probably want to use a kunit_action to clean up and avoid that
whole discussion
> +
> +/* Test pinning backing pages */
> +static void drm_gem_shmem_test_pin_pages(struct kunit *test)
> +{
> + struct fake_dev *fdev = test->priv;
> + struct drm_gem_shmem_object *shmem;
> + int i, ret;
> +
> + shmem = drm_gem_shmem_create(&fdev->drm_dev, TEST_SIZE);
> + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, shmem);
> + KUNIT_ASSERT_NULL(test, shmem->pages);
> + KUNIT_ASSERT_EQ(test, shmem->pages_use_count, 0);
> +
> + ret = drm_gem_shmem_pin(shmem);
> + KUNIT_ASSERT_EQ(test, ret, 0);
> + KUNIT_ASSERT_NOT_NULL(test, shmem->pages);
> + KUNIT_ASSERT_EQ(test, shmem->pages_use_count, 1);
> +
> + for (i = 0; i < (shmem->base.size >> PAGE_SHIFT); i++)
> + KUNIT_ASSERT_NOT_NULL(test, shmem->pages[i]);
> +
> + drm_gem_shmem_unpin(shmem);
> + KUNIT_ASSERT_NULL(test, shmem->pages);
> + KUNIT_ASSERT_EQ(test, shmem->pages_use_count, 0);
> +
> + drm_gem_shmem_free(shmem);
> +}
> +
> +/* Test creating a virtual mapping */
> +static void drm_gem_shmem_test_vmap(struct kunit *test)
> +{
> + struct fake_dev *fdev = test->priv;
> + struct drm_gem_shmem_object *shmem;
> + struct iosys_map map;
> + int ret, i;
> +
> + shmem = drm_gem_shmem_create(&fdev->drm_dev, TEST_SIZE);
> + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, shmem);
> + KUNIT_ASSERT_NULL(test, shmem->vaddr);
> + KUNIT_ASSERT_EQ(test, shmem->vmap_use_count, 0);
> +
> + ret = drm_gem_shmem_vmap(shmem, &map);
> + KUNIT_ASSERT_EQ(test, ret, 0);
> + KUNIT_ASSERT_NOT_NULL(test, shmem->vaddr);
> + KUNIT_ASSERT_EQ(test, shmem->vmap_use_count, 1);
> + KUNIT_ASSERT_FALSE(test, iosys_map_is_null(&map));
> +
> + iosys_map_memset(&map, 0, TEST_BYTE, TEST_SIZE);
> + for (i = 0; i < TEST_SIZE; i++)
> + KUNIT_ASSERT_EQ(test, iosys_map_rd(&map, i, u8), TEST_BYTE);
> +
> + drm_gem_shmem_vunmap(shmem, &map);
> + KUNIT_ASSERT_NULL(test, shmem->vaddr);
> + KUNIT_ASSERT_EQ(test, shmem->vmap_use_count, 0);
> +
> + drm_gem_shmem_free(shmem);
> +}
> +
> +/* Test exporting a scatter/gather table */
> +static void drm_gem_shmem_test_get_pages_sgt(struct kunit *test)
> +{
> + struct fake_dev *fdev = test->priv;
> + struct drm_gem_shmem_object *shmem;
> + struct sg_table *sgt;
> + struct scatterlist *sg;
> + unsigned int si, len = 0;
> + int ret;
> +
> + shmem = drm_gem_shmem_create(&fdev->drm_dev, TEST_SIZE);
> + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, shmem);
> +
> + ret = drm_gem_shmem_pin(shmem);
> + KUNIT_ASSERT_EQ(test, ret, 0);
> +
> + sgt = drm_gem_shmem_get_sg_table(shmem);
> + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, sgt);
> + KUNIT_ASSERT_NULL(test, shmem->sgt);
> +
> + for_each_sgtable_sg(sgt, sg, si) {
> + KUNIT_ASSERT_NOT_NULL(test, sg);
> + len += sg->length;
> + }
> + KUNIT_ASSERT_GE(test, len, TEST_SIZE);
> +
> + kfree(sgt);
> + drm_gem_shmem_free(shmem);
> +}
> +
> +/* Test exporting a scatter/gather pinned table for PRIME */
> +static void drm_gem_shmem_test_get_sg_table(struct kunit *test)
> +{
> + struct fake_dev *fdev = test->priv;
> + struct drm_gem_shmem_object *shmem;
> + struct sg_table *sgt;
> + struct scatterlist *sg;
> + unsigned int si, len = 0;
> +
> + shmem = drm_gem_shmem_create(&fdev->drm_dev, TEST_SIZE);
> + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, shmem);
> +
> + sgt = drm_gem_shmem_get_pages_sgt(shmem);
> + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, sgt);
> + KUNIT_ASSERT_PTR_EQ(test, sgt, shmem->sgt);
> +
> + for_each_sgtable_sg(sgt, sg, si) {
> + KUNIT_ASSERT_NOT_NULL(test, sg);
> + len += sg->length;
> + }
> + KUNIT_ASSERT_GE(test, len, TEST_SIZE);
> +
> + /* The scatter/gather table is freed by drm_gem_shmem_free */
> + drm_gem_shmem_free(shmem);
> +}
> +
> +/* Test updating madvise status */
> +static void drm_gem_shmem_test_madvise(struct kunit *test)
> +{
> + struct fake_dev *fdev = test->priv;
> + struct drm_gem_shmem_object *shmem;
> + int ret;
> +
> + shmem = drm_gem_shmem_create(&fdev->drm_dev, TEST_SIZE);
> + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, shmem);
> + KUNIT_ASSERT_EQ(test, shmem->madv, 0);
> +
> + ret = drm_gem_shmem_madvise(shmem, 1);
> + KUNIT_ASSERT_TRUE(test, ret);
> + KUNIT_ASSERT_EQ(test, shmem->madv, 1);
> +
> + ret = drm_gem_shmem_madvise(shmem, -1);
> + KUNIT_ASSERT_FALSE(test, ret);
> + KUNIT_ASSERT_EQ(test, shmem->madv, -1);
> +
> + ret = drm_gem_shmem_madvise(shmem, 0);
> + KUNIT_ASSERT_FALSE(test, ret);
> + KUNIT_ASSERT_EQ(test, shmem->madv, -1);
> +
> + drm_gem_shmem_free(shmem);
> +}
> +
> +/* Test purging */
> +static void drm_gem_shmem_test_purge(struct kunit *test)
> +{
> + struct fake_dev *fdev = test->priv;
> + struct drm_gem_shmem_object *shmem;
> + struct sg_table *sgt;
> + int ret;
> +
> + shmem = drm_gem_shmem_create(&fdev->drm_dev, TEST_SIZE);
> + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, shmem);
> +
> + ret = drm_gem_shmem_is_purgeable(shmem);
> + KUNIT_ASSERT_FALSE(test, ret);
> +
> + ret = drm_gem_shmem_madvise(shmem, 1);
> + KUNIT_ASSERT_TRUE(test, ret);
> +
> + sgt = drm_gem_shmem_get_pages_sgt(shmem);
> + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, sgt);
> +
> + ret = drm_gem_shmem_is_purgeable(shmem);
> + KUNIT_ASSERT_TRUE(test, ret);
> +
> + drm_gem_shmem_purge(shmem);
> + KUNIT_ASSERT_TRUE(test, ret);
> +
> + drm_gem_shmem_free(shmem);
> +}
> +
> +static int drm_gem_shmem_test_init(struct kunit *test)
> +{
> + struct fake_dev *fdev;
> + struct device *dev;
> +
> + /* Allocate a parent device */
> + dev = drm_kunit_helper_alloc_device(test);
> + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, dev);
> +
> + /*
> + * The DRM core will automatically initialize the GEM core and create
> + * a DRM Memory Manager object which provides an address space pool
> + * for GEM objects allocation.
> + */
> + fdev = drm_kunit_helper_alloc_drm_device(test, dev, struct fake_dev,
> + drm_dev, DRIVER_GEM);
> + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, fdev);
> +
> + fdev->dev = dev;
> + test->priv = fdev;
> +
> + return 0;
> +}
> +
> +static void drm_gem_shmem_test_exit(struct kunit *test)
> +{
> + struct fake_dev *fdev = test->priv;
> +
> + drm_kunit_helper_free_device(test, fdev->dev);
> +}
You don't need to call drm_kunit_helper_free_device() anymore
Maxime
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