From e4fa8457b2197118538a1400b75c898f9faaf164 Mon Sep 17 00:00:00 2001
From: Daniel Vetter <daniel.vetter@ffwll.ch>
Date: Fri, 14 Jun 2019 22:35:25 +0200
Subject: drm/prime: Align gem_prime_export with obj_funcs.export
MIME-Version: 1.0
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Content-Transfer-Encoding: 8bit
Git-commit: e4fa8457b2197118538a1400b75c898f9faaf164
Patch-mainline: v5.4-rc1
References: bsc#1152472
The idea is that gem_prime_export is deprecated in favor of
obj_funcs.export. That's much easier to do if both have matching
function signatures.
Reviewed-by: Eric Anholt <eric@anholt.net>
Reviewed-by: Emil Velikov <emil.velikov@collabora.com>
Acked-by: Christian König <christian.koenig@amd.com>
Acked-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Cc: Russell King <linux@armlinux.org.uk>
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc: Maxime Ripard <maxime.ripard@bootlin.com>
Cc: Sean Paul <sean@poorly.run>
Cc: David Airlie <airlied@linux.ie>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: Zhenyu Wang <zhenyuw@linux.intel.com>
Cc: Zhi Wang <zhi.a.wang@intel.com>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: Tomi Valkeinen <tomi.valkeinen@ti.com>
Cc: Alex Deucher <alexander.deucher@amd.com>
Cc: "Christian König" <christian.koenig@amd.com>
Cc: "David (ChunMing) Zhou" <David1.Zhou@amd.com>
Cc: Thierry Reding <thierry.reding@gmail.com>
Cc: Jonathan Hunter <jonathanh@nvidia.com>
Cc: Dave Airlie <airlied@redhat.com>
Cc: Eric Anholt <eric@anholt.net>
Cc: "Michel Dänzer" <michel.daenzer@amd.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Huang Rui <ray.huang@amd.com>
Cc: Felix Kuehling <Felix.Kuehling@amd.com>
Cc: Hawking Zhang <Hawking.Zhang@amd.com>
Cc: Feifei Xu <Feifei.Xu@amd.com>
Cc: Jim Qu <Jim.Qu@amd.com>
Cc: Evan Quan <evan.quan@amd.com>
Cc: Matthew Auld <matthew.auld@intel.com>
Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Cc: Thomas Zimmermann <tdz@users.sourceforge.net>
Cc: Kate Stewart <kstewart@linuxfoundation.org>
Cc: Sumit Semwal <sumit.semwal@linaro.org>
Cc: Jilayne Lovejoy <opensource@jilayne.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Mikulas Patocka <mpatocka@redhat.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Junwei Zhang <Jerry.Zhang@amd.com>
Cc: intel-gvt-dev@lists.freedesktop.org
Cc: intel-gfx@lists.freedesktop.org
Cc: amd-gfx@lists.freedesktop.org
Cc: linux-tegra@vger.kernel.org
Link: https://patchwork.freedesktop.org/patch/msgid/20190614203615.12639-10-daniel.vetter@ffwll.ch
Acked-by: Thomas Zimmermann <tzimmermann@suse.de>
---
drivers/gpu/drm/amd/amdgpu/amdgpu_dma_buf.c | 7 +++----
drivers/gpu/drm/amd/amdgpu/amdgpu_dma_buf.h | 3 +--
drivers/gpu/drm/armada/armada_gem.c | 5 ++---
drivers/gpu/drm/armada/armada_gem.h | 3 +--
drivers/gpu/drm/drm_prime.c | 9 ++++-----
drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c | 5 ++---
drivers/gpu/drm/i915/gem/selftests/i915_gem_dmabuf.c | 8 ++++----
drivers/gpu/drm/i915/gvt/dmabuf.c | 2 +-
drivers/gpu/drm/i915/i915_drv.h | 3 +--
drivers/gpu/drm/omapdrm/omap_gem.h | 3 +--
drivers/gpu/drm/omapdrm/omap_gem_dmabuf.c | 5 ++---
drivers/gpu/drm/radeon/radeon_drv.c | 3 +--
drivers/gpu/drm/radeon/radeon_prime.c | 5 ++---
drivers/gpu/drm/tegra/gem.c | 7 +++----
drivers/gpu/drm/tegra/gem.h | 3 +--
drivers/gpu/drm/udl/udl_dmabuf.c | 5 ++---
drivers/gpu/drm/udl/udl_drv.h | 3 +--
drivers/gpu/drm/vc4/vc4_bo.c | 5 ++---
drivers/gpu/drm/vc4/vc4_drv.h | 3 +--
drivers/gpu/drm/vgem/vgem_fence.c | 2 +-
include/drm/drm_drv.h | 4 ++--
include/drm/drm_prime.h | 3 +--
22 files changed, 39 insertions(+), 57 deletions(-)
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_dma_buf.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_dma_buf.c
@@ -345,8 +345,7 @@ const struct dma_buf_ops amdgpu_dmabuf_o
* Returns:
* Shared DMA buffer representing the GEM BO from the given device.
*/
-struct dma_buf *amdgpu_gem_prime_export(struct drm_device *dev,
- struct drm_gem_object *gobj,
+struct dma_buf *amdgpu_gem_prime_export(struct drm_gem_object *gobj,
int flags)
{
struct amdgpu_bo *bo = gem_to_amdgpu_bo(gobj);
@@ -356,9 +355,9 @@ struct dma_buf *amdgpu_gem_prime_export(
bo->flags & AMDGPU_GEM_CREATE_VM_ALWAYS_VALID)
return ERR_PTR(-EPERM);
- buf = drm_gem_prime_export(dev, gobj, flags);
+ buf = drm_gem_prime_export(gobj, flags);
if (!IS_ERR(buf)) {
- buf->file->f_mapping = dev->anon_inode->i_mapping;
+ buf->file->f_mapping = gobj->dev->anon_inode->i_mapping;
buf->ops = &amdgpu_dmabuf_ops;
}
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_dma_buf.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_dma_buf.h
@@ -30,8 +30,7 @@ struct drm_gem_object *
amdgpu_gem_prime_import_sg_table(struct drm_device *dev,
struct dma_buf_attachment *attach,
struct sg_table *sg);
-struct dma_buf *amdgpu_gem_prime_export(struct drm_device *dev,
- struct drm_gem_object *gobj,
+struct dma_buf *amdgpu_gem_prime_export(struct drm_gem_object *gobj,
int flags);
struct drm_gem_object *amdgpu_gem_prime_import(struct drm_device *dev,
struct dma_buf *dma_buf);
--- a/drivers/gpu/drm/armada/armada_gem.c
+++ b/drivers/gpu/drm/armada/armada_gem.c
@@ -482,8 +482,7 @@ static const struct dma_buf_ops armada_g
};
struct dma_buf *
-armada_gem_prime_export(struct drm_device *dev, struct drm_gem_object *obj,
- int flags)
+armada_gem_prime_export(struct drm_gem_object *obj, int flags)
{
DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
@@ -492,7 +491,7 @@ armada_gem_prime_export(struct drm_devic
exp_info.flags = O_RDWR;
exp_info.priv = obj;
- return drm_gem_dmabuf_export(dev, &exp_info);
+ return drm_gem_dmabuf_export(obj->dev, &exp_info);
}
struct drm_gem_object *
--- a/drivers/gpu/drm/armada/armada_gem.h
+++ b/drivers/gpu/drm/armada/armada_gem.h
@@ -32,8 +32,7 @@ struct armada_gem_object *armada_gem_all
size_t);
int armada_gem_dumb_create(struct drm_file *, struct drm_device *,
struct drm_mode_create_dumb *);
-struct dma_buf *armada_gem_prime_export(struct drm_device *dev,
- struct drm_gem_object *obj, int flags);
+struct dma_buf *armada_gem_prime_export(struct drm_gem_object *obj, int flags);
struct drm_gem_object *armada_gem_prime_import(struct drm_device *,
struct dma_buf *);
int armada_gem_map_import(struct armada_gem_object *);
--- a/drivers/gpu/drm/drm_prime.c
+++ b/drivers/gpu/drm/drm_prime.c
@@ -384,9 +384,9 @@ static struct dma_buf *export_and_regist
if (obj->funcs && obj->funcs->export)
dmabuf = obj->funcs->export(obj, flags);
else if (dev->driver->gem_prime_export)
- dmabuf = dev->driver->gem_prime_export(dev, obj, flags);
+ dmabuf = dev->driver->gem_prime_export(obj, flags);
else
- dmabuf = drm_gem_prime_export(dev, obj, flags);
+ dmabuf = drm_gem_prime_export(obj, flags);
if (IS_ERR(dmabuf)) {
/* normally the created dma-buf takes ownership of the ref,
* but if that fails then drop the ref
@@ -814,7 +814,6 @@ EXPORT_SYMBOL(drm_prime_pages_to_sg);
/**
* drm_gem_prime_export - helper library implementation of the export callback
- * @dev: drm_device to export from
* @obj: GEM object to export
* @flags: flags like DRM_CLOEXEC and DRM_RDWR
*
@@ -822,10 +821,10 @@ EXPORT_SYMBOL(drm_prime_pages_to_sg);
* using the PRIME helpers. It is used as the default in
* drm_gem_prime_handle_to_fd().
*/
-struct dma_buf *drm_gem_prime_export(struct drm_device *dev,
- struct drm_gem_object *obj,
+struct dma_buf *drm_gem_prime_export(struct drm_gem_object *obj,
int flags)
{
+ struct drm_device *dev = obj->dev;
struct dma_buf_export_info exp_info = {
.exp_name = KBUILD_MODNAME, /* white lie for debug */
.owner = dev->driver->fops->owner,
--- a/drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c
@@ -204,8 +204,7 @@ static const struct dma_buf_ops i915_dma
.end_cpu_access = i915_gem_end_cpu_access,
};
-struct dma_buf *i915_gem_prime_export(struct drm_device *dev,
- struct drm_gem_object *gem_obj, int flags)
+struct dma_buf *i915_gem_prime_export(struct drm_gem_object *gem_obj, int flags)
{
struct drm_i915_gem_object *obj = to_intel_bo(gem_obj);
DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
@@ -222,7 +221,7 @@ struct dma_buf *i915_gem_prime_export(st
return ERR_PTR(ret);
}
- return drm_gem_dmabuf_export(dev, &exp_info);
+ return drm_gem_dmabuf_export(gem_obj->dev, &exp_info);
}
static int i915_gem_object_get_pages_dmabuf(struct drm_i915_gem_object *obj)
--- a/drivers/gpu/drm/i915/gem/selftests/i915_gem_dmabuf.c
+++ b/drivers/gpu/drm/i915/gem/selftests/i915_gem_dmabuf.c
@@ -20,7 +20,7 @@ static int igt_dmabuf_export(void *arg)
if (IS_ERR(obj))
return PTR_ERR(obj);
- dmabuf = i915_gem_prime_export(&i915->drm, &obj->base, 0);
+ dmabuf = i915_gem_prime_export(&obj->base, 0);
i915_gem_object_put(obj);
if (IS_ERR(dmabuf)) {
pr_err("i915_gem_prime_export failed with err=%d\n",
@@ -44,7 +44,7 @@ static int igt_dmabuf_import_self(void *
if (IS_ERR(obj))
return PTR_ERR(obj);
- dmabuf = i915_gem_prime_export(&i915->drm, &obj->base, 0);
+ dmabuf = i915_gem_prime_export(&obj->base, 0);
if (IS_ERR(dmabuf)) {
pr_err("i915_gem_prime_export failed with err=%d\n",
(int)PTR_ERR(dmabuf));
@@ -219,7 +219,7 @@ static int igt_dmabuf_export_vmap(void *
if (IS_ERR(obj))
return PTR_ERR(obj);
- dmabuf = i915_gem_prime_export(&i915->drm, &obj->base, 0);
+ dmabuf = i915_gem_prime_export(&obj->base, 0);
if (IS_ERR(dmabuf)) {
pr_err("i915_gem_prime_export failed with err=%d\n",
(int)PTR_ERR(dmabuf));
@@ -266,7 +266,7 @@ static int igt_dmabuf_export_kmap(void *
if (IS_ERR(obj))
return PTR_ERR(obj);
- dmabuf = i915_gem_prime_export(&i915->drm, &obj->base, 0);
+ dmabuf = i915_gem_prime_export(&obj->base, 0);
i915_gem_object_put(obj);
if (IS_ERR(dmabuf)) {
err = PTR_ERR(dmabuf);
--- a/drivers/gpu/drm/i915/gvt/dmabuf.c
+++ b/drivers/gpu/drm/i915/gvt/dmabuf.c
@@ -491,7 +491,7 @@ int intel_vgpu_get_dmabuf(struct intel_v
obj->gvt_info = dmabuf_obj->info;
- dmabuf = i915_gem_prime_export(dev, &obj->base, DRM_CLOEXEC | DRM_RDWR);
+ dmabuf = i915_gem_prime_export(&obj->base, DRM_CLOEXEC | DRM_RDWR);
if (IS_ERR(dmabuf)) {
gvt_vgpu_err("export dma-buf failed\n");
ret = PTR_ERR(dmabuf);
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -2497,8 +2497,7 @@ int i915_gem_object_set_cache_level(stru
struct drm_gem_object *i915_gem_prime_import(struct drm_device *dev,
struct dma_buf *dma_buf);
-struct dma_buf *i915_gem_prime_export(struct drm_device *dev,
- struct drm_gem_object *gem_obj, int flags);
+struct dma_buf *i915_gem_prime_export(struct drm_gem_object *gem_obj, int flags);
static inline struct i915_gem_context *
__i915_gem_context_lookup_rcu(struct drm_i915_file_private *file_priv, u32 id)
--- a/drivers/gpu/drm/omapdrm/omap_gem.h
+++ b/drivers/gpu/drm/omapdrm/omap_gem.h
@@ -65,8 +65,7 @@ u64 omap_gem_mmap_offset(struct drm_gem_
size_t omap_gem_mmap_size(struct drm_gem_object *obj);
/* PRIME Interface */
-struct dma_buf *omap_gem_prime_export(struct drm_device *dev,
- struct drm_gem_object *obj, int flags);
+struct dma_buf *omap_gem_prime_export(struct drm_gem_object *obj, int flags);
struct drm_gem_object *omap_gem_prime_import(struct drm_device *dev,
struct dma_buf *buffer);
--- a/drivers/gpu/drm/omapdrm/omap_gem_dmabuf.c
+++ b/drivers/gpu/drm/omapdrm/omap_gem_dmabuf.c
@@ -125,8 +125,7 @@ static const struct dma_buf_ops omap_dma
.mmap = omap_gem_dmabuf_mmap,
};
-struct dma_buf *omap_gem_prime_export(struct drm_device *dev,
- struct drm_gem_object *obj, int flags)
+struct dma_buf *omap_gem_prime_export(struct drm_gem_object *obj, int flags)
{
DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
@@ -135,7 +134,7 @@ struct dma_buf *omap_gem_prime_export(st
exp_info.flags = flags;
exp_info.priv = obj;
- return drm_gem_dmabuf_export(dev, &exp_info);
+ return drm_gem_dmabuf_export(obj->dev, &exp_info);
}
/* -----------------------------------------------------------------------------
--- a/drivers/gpu/drm/radeon/radeon_drv.c
+++ b/drivers/gpu/drm/radeon/radeon_drv.c
@@ -130,8 +130,7 @@ int radeon_gem_object_open(struct drm_ge
struct drm_file *file_priv);
void radeon_gem_object_close(struct drm_gem_object *obj,
struct drm_file *file_priv);
-struct dma_buf *radeon_gem_prime_export(struct drm_device *dev,
- struct drm_gem_object *gobj,
+struct dma_buf *radeon_gem_prime_export(struct drm_gem_object *gobj,
int flags);
extern int radeon_get_crtc_scanoutpos(struct drm_device *dev, unsigned int crtc,
unsigned int flags, int *vpos, int *hpos,
--- a/drivers/gpu/drm/radeon/radeon_prime.c
+++ b/drivers/gpu/drm/radeon/radeon_prime.c
@@ -124,12 +124,11 @@ struct reservation_object *radeon_gem_pr
return bo->tbo.resv;
}
-struct dma_buf *radeon_gem_prime_export(struct drm_device *dev,
- struct drm_gem_object *gobj,
+struct dma_buf *radeon_gem_prime_export(struct drm_gem_object *gobj,
int flags)
{
struct radeon_bo *bo = gem_to_radeon_bo(gobj);
if (radeon_ttm_tt_has_userptr(bo->tbo.ttm))
return ERR_PTR(-EPERM);
- return drm_gem_prime_export(dev, gobj, flags);
+ return drm_gem_prime_export(gobj, flags);
}
--- a/drivers/gpu/drm/tegra/gem.c
+++ b/drivers/gpu/drm/tegra/gem.c
@@ -626,20 +626,19 @@ static const struct dma_buf_ops tegra_ge
.vunmap = tegra_gem_prime_vunmap,
};
-struct dma_buf *tegra_gem_prime_export(struct drm_device *drm,
- struct drm_gem_object *gem,
+struct dma_buf *tegra_gem_prime_export(struct drm_gem_object *gem,
int flags)
{
DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
exp_info.exp_name = KBUILD_MODNAME;
- exp_info.owner = drm->driver->fops->owner;
+ exp_info.owner = gem->dev->driver->fops->owner;
exp_info.ops = &tegra_gem_prime_dmabuf_ops;
exp_info.size = gem->size;
exp_info.flags = flags;
exp_info.priv = gem;
- return drm_gem_dmabuf_export(drm, &exp_info);
+ return drm_gem_dmabuf_export(gem->dev, &exp_info);
}
struct drm_gem_object *tegra_gem_prime_import(struct drm_device *drm,
--- a/drivers/gpu/drm/tegra/gem.h
+++ b/drivers/gpu/drm/tegra/gem.h
@@ -70,8 +70,7 @@ extern const struct vm_operations_struct
int __tegra_gem_mmap(struct drm_gem_object *gem, struct vm_area_struct *vma);
int tegra_drm_mmap(struct file *file, struct vm_area_struct *vma);
-struct dma_buf *tegra_gem_prime_export(struct drm_device *drm,
- struct drm_gem_object *gem,
+struct dma_buf *tegra_gem_prime_export(struct drm_gem_object *gem,
int flags);
struct drm_gem_object *tegra_gem_prime_import(struct drm_device *drm,
struct dma_buf *buf);
--- a/drivers/gpu/drm/udl/udl_dmabuf.c
+++ b/drivers/gpu/drm/udl/udl_dmabuf.c
@@ -170,8 +170,7 @@ static const struct dma_buf_ops udl_dmab
.release = drm_gem_dmabuf_release,
};
-struct dma_buf *udl_gem_prime_export(struct drm_device *dev,
- struct drm_gem_object *obj, int flags)
+struct dma_buf *udl_gem_prime_export(struct drm_gem_object *obj, int flags)
{
DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
@@ -180,7 +179,7 @@ struct dma_buf *udl_gem_prime_export(str
exp_info.flags = flags;
exp_info.priv = obj;
- return drm_gem_dmabuf_export(dev, &exp_info);
+ return drm_gem_dmabuf_export(obj->dev, &exp_info);
}
static int udl_prime_create(struct drm_device *dev,
--- a/drivers/gpu/drm/udl/udl_drv.h
+++ b/drivers/gpu/drm/udl/udl_drv.h
@@ -126,8 +126,7 @@ int udl_gem_mmap(struct drm_file *file_p
void udl_gem_free_object(struct drm_gem_object *gem_obj);
struct udl_gem_object *udl_gem_alloc_object(struct drm_device *dev,
size_t size);
-struct dma_buf *udl_gem_prime_export(struct drm_device *dev,
- struct drm_gem_object *obj, int flags);
+struct dma_buf *udl_gem_prime_export(struct drm_gem_object *obj, int flags);
struct drm_gem_object *udl_gem_prime_import(struct drm_device *dev,
struct dma_buf *dma_buf);
--- a/drivers/gpu/drm/vc4/vc4_bo.c
+++ b/drivers/gpu/drm/vc4/vc4_bo.c
@@ -655,8 +655,7 @@ static void vc4_bo_cache_time_timer(stru
schedule_work(&vc4->bo_cache.time_work);
}
-struct dma_buf *
-vc4_prime_export(struct drm_device *dev, struct drm_gem_object *obj, int flags)
+struct dma_buf * vc4_prime_export(struct drm_gem_object *obj, int flags)
{
struct vc4_bo *bo = to_vc4_bo(obj);
struct dma_buf *dmabuf;
@@ -678,7 +677,7 @@ vc4_prime_export(struct drm_device *dev,
return ERR_PTR(ret);
}
- dmabuf = drm_gem_prime_export(dev, obj, flags);
+ dmabuf = drm_gem_prime_export(obj, flags);
if (IS_ERR(dmabuf))
vc4_bo_dec_usecnt(bo);
--- a/drivers/gpu/drm/vc4/vc4_drv.h
+++ b/drivers/gpu/drm/vc4/vc4_drv.h
@@ -705,8 +705,7 @@ struct vc4_bo *vc4_bo_create(struct drm_
int vc4_dumb_create(struct drm_file *file_priv,
struct drm_device *dev,
struct drm_mode_create_dumb *args);
-struct dma_buf *vc4_prime_export(struct drm_device *dev,
- struct drm_gem_object *obj, int flags);
+struct dma_buf *vc4_prime_export(struct drm_gem_object *obj, int flags);
int vc4_create_bo_ioctl(struct drm_device *dev, void *data,
struct drm_file *file_priv);
int vc4_create_shader_bo_ioctl(struct drm_device *dev, void *data,
--- a/drivers/gpu/drm/vgem/vgem_fence.c
+++ b/drivers/gpu/drm/vgem/vgem_fence.c
@@ -108,7 +108,7 @@ static int attach_dmabuf(struct drm_devi
if (obj->dma_buf)
return 0;
- dmabuf = dev->driver->gem_prime_export(dev, obj, 0);
+ dmabuf = dev->driver->gem_prime_export(obj, 0);
if (IS_ERR(dmabuf))
return PTR_ERR(dmabuf);
--- a/include/drm/drm_drv.h
+++ b/include/drm/drm_drv.h
@@ -581,8 +581,8 @@ struct drm_driver {
* Export hook for GEM drivers. Deprecated in favour of
* &drm_gem_object_funcs.export.
*/
- struct dma_buf * (*gem_prime_export)(struct drm_device *dev,
- struct drm_gem_object *obj, int flags);
+ struct dma_buf * (*gem_prime_export)(struct drm_gem_object *obj,
+ int flags);
/**
* @gem_prime_import:
*
--- a/include/drm/drm_prime.h
+++ b/include/drm/drm_prime.h
@@ -91,8 +91,7 @@ int drm_gem_prime_mmap(struct drm_gem_ob
int drm_gem_dmabuf_mmap(struct dma_buf *dma_buf, struct vm_area_struct *vma);
struct sg_table *drm_prime_pages_to_sg(struct page **pages, unsigned int nr_pages);
-struct dma_buf *drm_gem_prime_export(struct drm_device *dev,
- struct drm_gem_object *obj,
+struct dma_buf *drm_gem_prime_export(struct drm_gem_object *obj,
int flags);
/* helper functions for importing */