[PATCH v2 1/2] drm/ttm: Change ttm_device_init to use a struct instead of multiple bools
Thomas Hellström
thomas.hellstrom at linux.intel.com
Wed Oct 2 12:54:56 UTC 2024
On Wed, 2024-10-02 at 14:45 +0200, Christian König wrote:
> Am 02.10.24 um 14:24 schrieb Thomas Hellström:
> > The ttm_device_init funcition uses multiple bool arguments. That
> > means
> > readability in the caller becomes poor, and all callers need to
> > change if
> > yet another bool is added.
> >
> > Instead use a struct with multiple single-bit flags. This addresses
> > both
> > problems. Prefer it over using defines or enums with explicit bit
> > shifts,
> > since converting to and from these bit values uses logical
> > operations or
> > tests which are implicit with the struct usage, and ofc type-
> > checking.
>
> Ok, that style is new to me. I've mostly seen defined parameter flags
> in
> the kernel.
>
> It obviously has some advantages, but do we have any precedence in
> the
> kernel for using that approach?
I don't know TBH, but I can take a look.
I've used the same style in some of the shrinker series patches, since
using multiple bools in the prototype severely reduces readability and
mixing the resulting flag defines without type-checking may introduce
hard-to find bugs.
/Thomas
>
> Regards,
> Christian.
>
> >
> > This is in preparation of adding yet another bool flag parameter to
> > the
> > function.
> >
> > Cc: Christian König <christian.koenig at amd.com>
> > Cc: amd-gfx at lists.freedesktop.org
> > Cc: intel-gfx at lists.freedesktop.org
> > Cc: nouveau at lists.freedesktop.org
> > Cc: spice-devel at lists.freedesktop.org
> > Cc: dri-devel at lists.freedesktop.org
> > Cc: Zack Rusin <zack.rusin at broadcom.com>
> > Cc: <bcm-kernel-feedback-list at broadcom.com>
> > Cc: Sui Jingfeng <suijingfeng at loongson.cn>
> > Cc: <intel-xe at lists.freedesktop.org>
> > Signed-off-by: Thomas Hellström <thomas.hellstrom at linux.intel.com>
> > ---
> > drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c | 6 ++++--
> > drivers/gpu/drm/drm_gem_vram_helper.c | 7 ++++---
> > drivers/gpu/drm/i915/intel_region_ttm.c | 3 ++-
> > drivers/gpu/drm/loongson/lsdc_ttm.c | 5 ++++-
> > drivers/gpu/drm/nouveau/nouveau_ttm.c | 7 +++++--
> > drivers/gpu/drm/qxl/qxl_ttm.c | 2 +-
> > drivers/gpu/drm/radeon/radeon_ttm.c | 6 ++++--
> > drivers/gpu/drm/ttm/tests/ttm_bo_test.c | 16 +++++++-------
> > -
> > .../gpu/drm/ttm/tests/ttm_bo_validate_test.c | 3 ++-
> > drivers/gpu/drm/ttm/tests/ttm_device_test.c | 16 ++++++++------
> > -
> > drivers/gpu/drm/ttm/tests/ttm_kunit_helpers.c | 20 ++++++++------
> > -----
> > drivers/gpu/drm/ttm/tests/ttm_kunit_helpers.h | 6 ++----
> > drivers/gpu/drm/ttm/ttm_device.c | 7 +++----
> > drivers/gpu/drm/vmwgfx/vmwgfx_drv.c | 4 ++--
> > drivers/gpu/drm/xe/xe_device.c | 3 ++-
> > include/drm/ttm/ttm_device.h | 12 ++++++++++-
> > 16 files changed, 71 insertions(+), 52 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
> > b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
> > index 74adb983ab03..e43635ac54fd 100644
> > --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
> > +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
> > @@ -1853,8 +1853,10 @@ int amdgpu_ttm_init(struct amdgpu_device
> > *adev)
> > r = ttm_device_init(&adev->mman.bdev, &amdgpu_bo_driver,
> > adev->dev,
> > adev_to_drm(adev)->anon_inode-
> > >i_mapping,
> > adev_to_drm(adev)-
> > >vma_offset_manager,
> > - adev->need_swiotlb,
> > - dma_addressing_limited(adev->dev));
> > + (struct ttm_device_init_flags){
> > + .use_dma_alloc = adev-
> > >need_swiotlb,
> > + .use_dma32 =
> > dma_addressing_limited(adev->dev)
> > + });
> > if (r) {
> > DRM_ERROR("failed initializing buffer object
> > driver(%d).\n", r);
> > return r;
> > diff --git a/drivers/gpu/drm/drm_gem_vram_helper.c
> > b/drivers/gpu/drm/drm_gem_vram_helper.c
> > index 22b1fe9c03b8..7c3165b00378 100644
> > --- a/drivers/gpu/drm/drm_gem_vram_helper.c
> > +++ b/drivers/gpu/drm/drm_gem_vram_helper.c
> > @@ -931,9 +931,10 @@ static int drm_vram_mm_init(struct drm_vram_mm
> > *vmm, struct drm_device *dev,
> > vmm->vram_size = vram_size;
> >
> > ret = ttm_device_init(&vmm->bdev, &bo_driver, dev->dev,
> > - dev->anon_inode->i_mapping,
> > - dev->vma_offset_manager,
> > - false, true);
> > + dev->anon_inode->i_mapping,
> > + dev->vma_offset_manager,
> > + (struct ttm_device_init_flags)
> > + {.use_dma32 = true});
> > if (ret)
> > return ret;
> >
> > diff --git a/drivers/gpu/drm/i915/intel_region_ttm.c
> > b/drivers/gpu/drm/i915/intel_region_ttm.c
> > index 04525d92bec5..db34da63814c 100644
> > --- a/drivers/gpu/drm/i915/intel_region_ttm.c
> > +++ b/drivers/gpu/drm/i915/intel_region_ttm.c
> > @@ -34,7 +34,8 @@ int intel_region_ttm_device_init(struct
> > drm_i915_private *dev_priv)
> >
> > return ttm_device_init(&dev_priv->bdev, i915_ttm_driver(),
> > drm->dev, drm->anon_inode-
> > >i_mapping,
> > - drm->vma_offset_manager, false,
> > false);
> > + drm->vma_offset_manager,
> > + (struct ttm_device_init_flags){});
> > }
> >
> > /**
> > diff --git a/drivers/gpu/drm/loongson/lsdc_ttm.c
> > b/drivers/gpu/drm/loongson/lsdc_ttm.c
> > index 2e42c6970c9f..c684f1636f3f 100644
> > --- a/drivers/gpu/drm/loongson/lsdc_ttm.c
> > +++ b/drivers/gpu/drm/loongson/lsdc_ttm.c
> > @@ -544,7 +544,10 @@ int lsdc_ttm_init(struct lsdc_device *ldev)
> >
> > ret = ttm_device_init(&ldev->bdev, &lsdc_bo_driver, ddev-
> > >dev,
> > ddev->anon_inode->i_mapping,
> > - ddev->vma_offset_manager, false,
> > true);
> > + ddev->vma_offset_manager,
> > + (struct ttm_device_init_flags){
> > + .use_dma32 = true
> > + });
> > if (ret)
> > return ret;
> >
> > diff --git a/drivers/gpu/drm/nouveau/nouveau_ttm.c
> > b/drivers/gpu/drm/nouveau/nouveau_ttm.c
> > index e244927eb5d4..5f89d2b40425 100644
> > --- a/drivers/gpu/drm/nouveau/nouveau_ttm.c
> > +++ b/drivers/gpu/drm/nouveau/nouveau_ttm.c
> > @@ -302,8 +302,11 @@ nouveau_ttm_init(struct nouveau_drm *drm)
> > ret = ttm_device_init(&drm->ttm.bdev, &nouveau_bo_driver,
> > drm->dev->dev,
> > dev->anon_inode->i_mapping,
> > dev->vma_offset_manager,
> > - drm_need_swiotlb(drm-
> > >client.mmu.dmabits),
> > - drm->client.mmu.dmabits <= 32);
> > + (struct ttm_device_init_flags){
> > + .use_dma_alloc =
> > + drm_need_swiotlb(drm-
> > >client.mmu.dmabits),
> > + .use_dma32 = (drm-
> > >client.mmu.dmabits <= 32)
> > + });
> > if (ret) {
> > NV_ERROR(drm, "error initialising bo driver,
> > %d\n", ret);
> > return ret;
> > diff --git a/drivers/gpu/drm/qxl/qxl_ttm.c
> > b/drivers/gpu/drm/qxl/qxl_ttm.c
> > index 765a144cea14..ced4c60c4650 100644
> > --- a/drivers/gpu/drm/qxl/qxl_ttm.c
> > +++ b/drivers/gpu/drm/qxl/qxl_ttm.c
> > @@ -196,7 +196,7 @@ int qxl_ttm_init(struct qxl_device *qdev)
> > r = ttm_device_init(&qdev->mman.bdev, &qxl_bo_driver,
> > NULL,
> > qdev->ddev.anon_inode->i_mapping,
> > qdev->ddev.vma_offset_manager,
> > - false, false);
> > + (struct ttm_device_init_flags){});
> > if (r) {
> > DRM_ERROR("failed initializing buffer object
> > driver(%d).\n", r);
> > return r;
> > diff --git a/drivers/gpu/drm/radeon/radeon_ttm.c
> > b/drivers/gpu/drm/radeon/radeon_ttm.c
> > index 69d0c12fa419..2915473e4956 100644
> > --- a/drivers/gpu/drm/radeon/radeon_ttm.c
> > +++ b/drivers/gpu/drm/radeon/radeon_ttm.c
> > @@ -684,8 +684,10 @@ int radeon_ttm_init(struct radeon_device
> > *rdev)
> > r = ttm_device_init(&rdev->mman.bdev, &radeon_bo_driver,
> > rdev->dev,
> > rdev_to_drm(rdev)->anon_inode-
> > >i_mapping,
> > rdev_to_drm(rdev)-
> > >vma_offset_manager,
> > - rdev->need_swiotlb,
> > - dma_addressing_limited(&rdev->pdev-
> > >dev));
> > + (struct ttm_device_init_flags){
> > + .use_dma_alloc = rdev-
> > >need_swiotlb,
> > + .use_dma32 =
> > dma_addressing_limited(&rdev->pdev->dev)
> > + });
> > if (r) {
> > DRM_ERROR("failed initializing buffer object
> > driver(%d).\n", r);
> > return r;
> > diff --git a/drivers/gpu/drm/ttm/tests/ttm_bo_test.c
> > b/drivers/gpu/drm/ttm/tests/ttm_bo_test.c
> > index f0a7eb62116c..8a2ab90c6e8f 100644
> > --- a/drivers/gpu/drm/ttm/tests/ttm_bo_test.c
> > +++ b/drivers/gpu/drm/ttm/tests/ttm_bo_test.c
> > @@ -251,7 +251,7 @@ static void ttm_bo_unreserve_basic(struct kunit
> > *test)
> > ttm_dev = kunit_kzalloc(test, sizeof(*ttm_dev),
> > GFP_KERNEL);
> > KUNIT_ASSERT_NOT_NULL(test, ttm_dev);
> >
> > - err = ttm_device_kunit_init(priv, ttm_dev, false, false);
> > + err = ttm_device_kunit_init(priv, ttm_dev, (struct
> > ttm_device_init_flags){});
> > KUNIT_ASSERT_EQ(test, err, 0);
> > priv->ttm_dev = ttm_dev;
> >
> > @@ -290,7 +290,7 @@ static void ttm_bo_unreserve_pinned(struct
> > kunit *test)
> > ttm_dev = kunit_kzalloc(test, sizeof(*ttm_dev),
> > GFP_KERNEL);
> > KUNIT_ASSERT_NOT_NULL(test, ttm_dev);
> >
> > - err = ttm_device_kunit_init(priv, ttm_dev, false, false);
> > + err = ttm_device_kunit_init(priv, ttm_dev, (struct
> > ttm_device_init_flags){});
> > KUNIT_ASSERT_EQ(test, err, 0);
> > priv->ttm_dev = ttm_dev;
> >
> > @@ -342,7 +342,7 @@ static void ttm_bo_unreserve_bulk(struct kunit
> > *test)
> > resv = kunit_kzalloc(test, sizeof(*resv), GFP_KERNEL);
> > KUNIT_ASSERT_NOT_NULL(test, ttm_dev);
> >
> > - err = ttm_device_kunit_init(priv, ttm_dev, false, false);
> > + err = ttm_device_kunit_init(priv, ttm_dev, (struct
> > ttm_device_init_flags){});
> > KUNIT_ASSERT_EQ(test, err, 0);
> > priv->ttm_dev = ttm_dev;
> >
> > @@ -394,7 +394,7 @@ static void ttm_bo_put_basic(struct kunit
> > *test)
> > ttm_dev = kunit_kzalloc(test, sizeof(*ttm_dev),
> > GFP_KERNEL);
> > KUNIT_ASSERT_NOT_NULL(test, ttm_dev);
> >
> > - err = ttm_device_kunit_init(priv, ttm_dev, false, false);
> > + err = ttm_device_kunit_init(priv, ttm_dev, (struct
> > ttm_device_init_flags){});
> > KUNIT_ASSERT_EQ(test, err, 0);
> > priv->ttm_dev = ttm_dev;
> >
> > @@ -437,7 +437,7 @@ static void ttm_bo_put_shared_resv(struct kunit
> > *test)
> > ttm_dev = kunit_kzalloc(test, sizeof(*ttm_dev),
> > GFP_KERNEL);
> > KUNIT_ASSERT_NOT_NULL(test, ttm_dev);
> >
> > - err = ttm_device_kunit_init(priv, ttm_dev, false, false);
> > + err = ttm_device_kunit_init(priv, ttm_dev, (struct
> > ttm_device_init_flags){});
> > KUNIT_ASSERT_EQ(test, err, 0);
> > priv->ttm_dev = ttm_dev;
> >
> > @@ -477,7 +477,7 @@ static void ttm_bo_pin_basic(struct kunit
> > *test)
> > ttm_dev = kunit_kzalloc(test, sizeof(*ttm_dev),
> > GFP_KERNEL);
> > KUNIT_ASSERT_NOT_NULL(test, ttm_dev);
> >
> > - err = ttm_device_kunit_init(priv, ttm_dev, false, false);
> > + err = ttm_device_kunit_init(priv, ttm_dev, (struct
> > ttm_device_init_flags){});
> > KUNIT_ASSERT_EQ(test, err, 0);
> > priv->ttm_dev = ttm_dev;
> >
> > @@ -512,7 +512,7 @@ static void ttm_bo_pin_unpin_resource(struct
> > kunit *test)
> > ttm_dev = kunit_kzalloc(test, sizeof(*ttm_dev),
> > GFP_KERNEL);
> > KUNIT_ASSERT_NOT_NULL(test, ttm_dev);
> >
> > - err = ttm_device_kunit_init(priv, ttm_dev, false, false);
> > + err = ttm_device_kunit_init(priv, ttm_dev, (struct
> > ttm_device_init_flags){});
> > KUNIT_ASSERT_EQ(test, err, 0);
> > priv->ttm_dev = ttm_dev;
> >
> > @@ -563,7 +563,7 @@ static void
> > ttm_bo_multiple_pin_one_unpin(struct kunit *test)
> > ttm_dev = kunit_kzalloc(test, sizeof(*ttm_dev),
> > GFP_KERNEL);
> > KUNIT_ASSERT_NOT_NULL(test, ttm_dev);
> >
> > - err = ttm_device_kunit_init(priv, ttm_dev, false, false);
> > + err = ttm_device_kunit_init(priv, ttm_dev, (struct
> > ttm_device_init_flags){});
> > KUNIT_ASSERT_EQ(test, err, 0);
> > priv->ttm_dev = ttm_dev;
> >
> > 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 1adf18481ea0..c69b9707e6d2 100644
> > --- a/drivers/gpu/drm/ttm/tests/ttm_bo_validate_test.c
> > +++ b/drivers/gpu/drm/ttm/tests/ttm_bo_validate_test.c
> > @@ -1044,7 +1044,8 @@ static void
> > ttm_bo_validate_busy_domain_evict(struct kunit *test)
> > */
> > ttm_device_fini(priv->ttm_dev);
> >
> > - err = ttm_device_kunit_init_bad_evict(test->priv, priv-
> > >ttm_dev, false, false);
> > + err = ttm_device_kunit_init_bad_evict(test->priv, priv-
> > >ttm_dev,
> > + (struct
> > ttm_device_init_flags){});
> > KUNIT_ASSERT_EQ(test, err, 0);
> >
> > ttm_mock_manager_init(priv->ttm_dev, mem_type,
> > MANAGER_SIZE);
> > diff --git a/drivers/gpu/drm/ttm/tests/ttm_device_test.c
> > b/drivers/gpu/drm/ttm/tests/ttm_device_test.c
> > index 1621903818e5..9415c7b76e3b 100644
> > --- a/drivers/gpu/drm/ttm/tests/ttm_device_test.c
> > +++ b/drivers/gpu/drm/ttm/tests/ttm_device_test.c
> > @@ -25,7 +25,7 @@ static void ttm_device_init_basic(struct kunit
> > *test)
> > ttm_dev = kunit_kzalloc(test, sizeof(*ttm_dev),
> > GFP_KERNEL);
> > KUNIT_ASSERT_NOT_NULL(test, ttm_dev);
> >
> > - err = ttm_device_kunit_init(priv, ttm_dev, false, false);
> > + err = ttm_device_kunit_init(priv, ttm_dev, (struct
> > ttm_device_init_flags){});
> > KUNIT_ASSERT_EQ(test, err, 0);
> >
> > KUNIT_EXPECT_PTR_EQ(test, ttm_dev->funcs, &ttm_dev_funcs);
> > @@ -55,7 +55,8 @@ static void ttm_device_init_multiple(struct kunit
> > *test)
> > KUNIT_ASSERT_NOT_NULL(test, ttm_devs);
> >
> > for (i = 0; i < num_dev; i++) {
> > - err = ttm_device_kunit_init(priv, &ttm_devs[i],
> > false, false);
> > + err = ttm_device_kunit_init(priv, &ttm_devs[i],
> > + (struct
> > ttm_device_init_flags){});
> > KUNIT_ASSERT_EQ(test, err, 0);
> >
> > KUNIT_EXPECT_PTR_EQ(test, ttm_devs[i].dev_mapping,
> > @@ -81,7 +82,7 @@ static void ttm_device_fini_basic(struct kunit
> > *test)
> > ttm_dev = kunit_kzalloc(test, sizeof(*ttm_dev),
> > GFP_KERNEL);
> > KUNIT_ASSERT_NOT_NULL(test, ttm_dev);
> >
> > - err = ttm_device_kunit_init(priv, ttm_dev, false, false);
> > + err = ttm_device_kunit_init(priv, ttm_dev, (struct
> > ttm_device_init_flags){});
> > KUNIT_ASSERT_EQ(test, err, 0);
> >
> > man = ttm_manager_type(ttm_dev, TTM_PL_SYSTEM);
> > @@ -109,7 +110,7 @@ static void ttm_device_init_no_vma_man(struct
> > kunit *test)
> > vma_man = drm->vma_offset_manager;
> > drm->vma_offset_manager = NULL;
> >
> > - err = ttm_device_kunit_init(priv, ttm_dev, false, false);
> > + err = ttm_device_kunit_init(priv, ttm_dev, (struct
> > ttm_device_init_flags){});
> > KUNIT_EXPECT_EQ(test, err, -EINVAL);
> >
> > /* Bring the manager back for a graceful cleanup */
> > @@ -162,9 +163,10 @@ static void ttm_device_init_pools(struct kunit
> > *test)
> > ttm_dev = kunit_kzalloc(test, sizeof(*ttm_dev),
> > GFP_KERNEL);
> > KUNIT_ASSERT_NOT_NULL(test, ttm_dev);
> >
> > - err = ttm_device_kunit_init(priv, ttm_dev,
> > - params->use_dma_alloc,
> > - params->use_dma32);
> > + err = ttm_device_kunit_init(priv, ttm_dev, (struct
> > ttm_device_init_flags){
> > + .use_dma_alloc = params->use_dma_alloc,
> > + .use_dma32 = params->use_dma32
> > + });
> > KUNIT_ASSERT_EQ(test, err, 0);
> >
> > pool = &ttm_dev->pool;
> > diff --git a/drivers/gpu/drm/ttm/tests/ttm_kunit_helpers.c
> > b/drivers/gpu/drm/ttm/tests/ttm_kunit_helpers.c
> > index b91c13f46225..24706fabb1c9 100644
> > --- a/drivers/gpu/drm/ttm/tests/ttm_kunit_helpers.c
> > +++ b/drivers/gpu/drm/ttm/tests/ttm_kunit_helpers.c
> > @@ -114,8 +114,7 @@ static void bad_evict_flags(struct
> > ttm_buffer_object *bo,
> >
> > static int ttm_device_kunit_init_with_funcs(struct
> > ttm_test_devices *priv,
> > struct ttm_device
> > *ttm,
> > - bool use_dma_alloc,
> > - bool use_dma32,
> > + const struct
> > ttm_device_init_flags flags,
> > struct
> > ttm_device_funcs *funcs)
> > {
> > struct drm_device *drm = priv->drm;
> > @@ -124,7 +123,7 @@ static int
> > ttm_device_kunit_init_with_funcs(struct ttm_test_devices *priv,
> > err = ttm_device_init(ttm, funcs, drm->dev,
> > drm->anon_inode->i_mapping,
> > drm->vma_offset_manager,
> > - use_dma_alloc, use_dma32);
> > + flags);
> >
> > return err;
> > }
> > @@ -140,11 +139,9 @@ EXPORT_SYMBOL_GPL(ttm_dev_funcs);
> >
> > int ttm_device_kunit_init(struct ttm_test_devices *priv,
> > struct ttm_device *ttm,
> > - bool use_dma_alloc,
> > - bool use_dma32)
> > + const struct ttm_device_init_flags
> > flags)
> > {
> > - return ttm_device_kunit_init_with_funcs(priv, ttm,
> > use_dma_alloc,
> > - use_dma32,
> > &ttm_dev_funcs);
> > + return ttm_device_kunit_init_with_funcs(priv, ttm, flags,
> > &ttm_dev_funcs);
> > }
> > EXPORT_SYMBOL_GPL(ttm_device_kunit_init);
> >
> > @@ -159,11 +156,10 @@ EXPORT_SYMBOL_GPL(ttm_dev_funcs_bad_evict);
> >
> > int ttm_device_kunit_init_bad_evict(struct ttm_test_devices
> > *priv,
> > struct ttm_device *ttm,
> > - bool use_dma_alloc,
> > - bool use_dma32)
> > + const struct
> > ttm_device_init_flags flags)
> > {
> > - return ttm_device_kunit_init_with_funcs(priv, ttm,
> > use_dma_alloc,
> > - use_dma32,
> > &ttm_dev_funcs_bad_evict);
> > + return ttm_device_kunit_init_with_funcs(priv, ttm, flags,
> > + &ttm_dev_funcs_bad
> > _evict);
> > }
> > EXPORT_SYMBOL_GPL(ttm_device_kunit_init_bad_evict);
> >
> > @@ -249,7 +245,7 @@ struct ttm_test_devices
> > *ttm_test_devices_all(struct kunit *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, false, false);
> > + err = ttm_device_kunit_init(devs, ttm_dev, (struct
> > ttm_device_init_flags){});
> > KUNIT_ASSERT_EQ(test, err, 0);
> >
> > devs->ttm_dev = ttm_dev;
> > diff --git a/drivers/gpu/drm/ttm/tests/ttm_kunit_helpers.h
> > b/drivers/gpu/drm/ttm/tests/ttm_kunit_helpers.h
> > index c7da23232ffa..fbf0d3984f25 100644
> > --- a/drivers/gpu/drm/ttm/tests/ttm_kunit_helpers.h
> > +++ b/drivers/gpu/drm/ttm/tests/ttm_kunit_helpers.h
> > @@ -28,12 +28,10 @@ struct ttm_test_devices {
> > /* Building blocks for test-specific init functions */
> > int ttm_device_kunit_init(struct ttm_test_devices *priv,
> > struct ttm_device *ttm,
> > - bool use_dma_alloc,
> > - bool use_dma32);
> > + const struct ttm_device_init_flags
> > flags);
> > int ttm_device_kunit_init_bad_evict(struct ttm_test_devices
> > *priv,
> > struct ttm_device *ttm,
> > - bool use_dma_alloc,
> > - bool use_dma32);
> > + const struct
> > ttm_device_init_flags flags);
> > struct ttm_buffer_object *ttm_bo_kunit_init(struct kunit *test,
> > struct
> > ttm_test_devices *devs,
> > size_t size,
> > diff --git a/drivers/gpu/drm/ttm/ttm_device.c
> > b/drivers/gpu/drm/ttm/ttm_device.c
> > index e7cc4954c1bc..0c85d10e5e0b 100644
> > --- a/drivers/gpu/drm/ttm/ttm_device.c
> > +++ b/drivers/gpu/drm/ttm/ttm_device.c
> > @@ -174,8 +174,7 @@ EXPORT_SYMBOL(ttm_device_swapout);
> > * @dev: The core kernel device pointer for DMA mappings and
> > allocations.
> > * @mapping: The address space to use for this bo.
> > * @vma_manager: A pointer to a vma manager.
> > - * @use_dma_alloc: If coherent DMA allocation API should be used.
> > - * @use_dma32: If we should use GFP_DMA32 for device memory
> > allocations.
> > + * @flags: Flags governing the device behaviour.
> > *
> > * Initializes a struct ttm_device:
> > * Returns:
> > @@ -184,7 +183,7 @@ EXPORT_SYMBOL(ttm_device_swapout);
> > int ttm_device_init(struct ttm_device *bdev, const struct
> > ttm_device_funcs *funcs,
> > struct device *dev, struct address_space
> > *mapping,
> > struct drm_vma_offset_manager *vma_manager,
> > - bool use_dma_alloc, bool use_dma32)
> > + const struct ttm_device_init_flags flags)
> > {
> > struct ttm_global *glob = &ttm_glob;
> > int ret, nid;
> > @@ -212,7 +211,7 @@ int ttm_device_init(struct ttm_device *bdev,
> > const struct ttm_device_funcs *func
> > else
> > nid = NUMA_NO_NODE;
> >
> > - ttm_pool_init(&bdev->pool, dev, nid, use_dma_alloc,
> > use_dma32);
> > + ttm_pool_init(&bdev->pool, dev, nid, flags.use_dma_alloc,
> > flags.use_dma32);
> >
> > bdev->vma_manager = vma_manager;
> > spin_lock_init(&bdev->lru_lock);
> > diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c
> > b/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c
> > index cf7a89d002e4..7ff7e5d7a9f3 100644
> > --- a/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c
> > +++ b/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c
> > @@ -1049,8 +1049,8 @@ static int vmw_driver_load(struct vmw_private
> > *dev_priv, u32 pci_id)
> > dev_priv->drm.dev,
> > dev_priv->drm.anon_inode->i_mapping,
> > dev_priv->drm.vma_offset_manager,
> > - dev_priv->map_mode ==
> > vmw_dma_alloc_coherent,
> > - false);
> > + (struct ttm_device_init_flags)
> > + {.use_dma_alloc = (dev_priv-
> > >map_mode == vmw_dma_alloc_coherent)});
> > if (unlikely(ret != 0)) {
> > drm_err(&dev_priv->drm,
> > "Failed initializing TTM buffer object
> > driver.\n");
> > diff --git a/drivers/gpu/drm/xe/xe_device.c
> > b/drivers/gpu/drm/xe/xe_device.c
> > index 09a7ad830e69..f9317f56ff9c 100644
> > --- a/drivers/gpu/drm/xe/xe_device.c
> > +++ b/drivers/gpu/drm/xe/xe_device.c
> > @@ -320,7 +320,8 @@ struct xe_device *xe_device_create(struct
> > pci_dev *pdev,
> >
> > err = ttm_device_init(&xe->ttm, &xe_ttm_funcs, xe-
> > >drm.dev,
> > xe->drm.anon_inode->i_mapping,
> > - xe->drm.vma_offset_manager, false,
> > false);
> > + xe->drm.vma_offset_manager,
> > + (struct ttm_device_init_flags){});
> > if (WARN_ON(err))
> > goto err;
> >
> > diff --git a/include/drm/ttm/ttm_device.h
> > b/include/drm/ttm/ttm_device.h
> > index c22f30535c84..1534bd946c78 100644
> > --- a/include/drm/ttm/ttm_device.h
> > +++ b/include/drm/ttm/ttm_device.h
> > @@ -287,10 +287,20 @@ static inline void
> > ttm_set_driver_manager(struct ttm_device *bdev, int type,
> > bdev->man_drv[type] = manager;
> > }
> >
> > +/**
> > + * struct ttm_device_init_flags - Flags for ttm device creation
> > + */
> > +struct ttm_device_init_flags {
> > + /** @use_dma_alloc: Whether coherent DMA allocation API
> > should be used. */
> > + u32 use_dma_alloc : 1;
> > + /** @use_dma32: If we should use GFP_DMA32 for device
> > memory allocations. */
> > + u32 use_dma32 : 1;
> > +};
> > +
> > int ttm_device_init(struct ttm_device *bdev, const struct
> > ttm_device_funcs *funcs,
> > struct device *dev, struct address_space
> > *mapping,
> > struct drm_vma_offset_manager *vma_manager,
> > - bool use_dma_alloc, bool use_dma32);
> > + const struct ttm_device_init_flags flags);
> > void ttm_device_fini(struct ttm_device *bdev);
> > void ttm_device_clear_dma_mappings(struct ttm_device *bdev);
> >
>
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