[PATCH 2/6] Revert "drm/ttm: initialize globals during device init (v2)"

[Karol Herbst <kherbst@redhat.com>]

This reverts commit a64f784bb14a56bfdfad2dc397dd67e4564e3a29.

Signed-off-by: Karol Herbst <kherbst@redhat.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c       | 59 ++++++++++++++++++-
 drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h       |  1 +
 drivers/gpu/drm/ast/ast_drv.h                 |  1 +
 drivers/gpu/drm/ast/ast_ttm.c                 | 36 +++++++++++
 drivers/gpu/drm/bochs/bochs.h                 |  1 +
 drivers/gpu/drm/bochs/bochs_mm.c              | 35 +++++++++++
 drivers/gpu/drm/cirrus/cirrus_drv.h           |  1 +
 drivers/gpu/drm/cirrus/cirrus_ttm.c           | 36 +++++++++++
 .../gpu/drm/hisilicon/hibmc/hibmc_drm_drv.h   |  1 +
 drivers/gpu/drm/hisilicon/hibmc/hibmc_ttm.c   | 34 +++++++++++
 drivers/gpu/drm/mgag200/mgag200_drv.h         |  1 +
 drivers/gpu/drm/mgag200/mgag200_ttm.c         | 36 +++++++++++
 drivers/gpu/drm/nouveau/nouveau_drv.h         |  1 +
 drivers/gpu/drm/nouveau/nouveau_ttm.c         | 39 ++++++++++++
 drivers/gpu/drm/qxl/qxl_drv.h                 |  2 +
 drivers/gpu/drm/qxl/qxl_ttm.c                 | 33 +++++++++++
 drivers/gpu/drm/radeon/radeon.h               |  2 +
 drivers/gpu/drm/radeon/radeon_ttm.c           | 39 ++++++++++++
 drivers/gpu/drm/ttm/ttm_bo.c                  | 19 +++---
 drivers/gpu/drm/virtio/virtgpu_drv.h          |  2 +
 drivers/gpu/drm/virtio/virtgpu_ttm.c          | 35 +++++++++++
 drivers/gpu/drm/vmwgfx/vmwgfx_drv.c           | 11 +++-
 drivers/gpu/drm/vmwgfx/vmwgfx_drv.h           |  3 +
 drivers/gpu/drm/vmwgfx/vmwgfx_ttm_glue.c      | 27 +++++++++
 drivers/staging/vboxvideo/vbox_drv.h          |  1 +
 drivers/staging/vboxvideo/vbox_ttm.c          | 41 ++++++++++++-
 include/drm/ttm/ttm_bo_driver.h               | 41 ++++++++++++-
 27 files changed, 521 insertions(+), 17 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
index c91ec3101d00..213d29d0ad80 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
@@ -61,6 +61,56 @@ static int amdgpu_map_buffer(struct ttm_buffer_object *bo,
 static int amdgpu_ttm_debugfs_init(struct amdgpu_device *adev);
 static void amdgpu_ttm_debugfs_fini(struct amdgpu_device *adev);
 
+/*
+ * Global memory.
+ */
+
+/**
+ * amdgpu_ttm_global_init - Initialize global TTM memory reference structures.
+ *
+ * @adev: AMDGPU device for which the global structures need to be registered.
+ *
+ * This is called as part of the AMDGPU ttm init from amdgpu_ttm_init()
+ * during bring up.
+ */
+static int amdgpu_ttm_global_init(struct amdgpu_device *adev)
+{
+	struct drm_global_reference *global_ref;
+	int r;
+
+	/* ensure reference is false in case init fails */
+	adev->mman.mem_global_referenced = false;
+
+	global_ref = &adev->mman.bo_global_ref.ref;
+	global_ref->global_type = DRM_GLOBAL_TTM_BO;
+	global_ref->size = sizeof(struct ttm_bo_global);
+	global_ref->init = &ttm_bo_global_ref_init;
+	global_ref->release = &ttm_bo_global_ref_release;
+	r = drm_global_item_ref(global_ref);
+	if (r) {
+		DRM_ERROR("Failed setting up TTM BO subsystem.\n");
+		goto error_bo;
+	}
+
+	mutex_init(&adev->mman.gtt_window_lock);
+
+	adev->mman.mem_global_referenced = true;
+
+	return 0;
+
+error_bo:
+	return r;
+}
+
+static void amdgpu_ttm_global_fini(struct amdgpu_device *adev)
+{
+	if (adev->mman.mem_global_referenced) {
+		mutex_destroy(&adev->mman.gtt_window_lock);
+		drm_global_item_unref(&adev->mman.bo_global_ref.ref);
+		adev->mman.mem_global_referenced = false;
+	}
+}
+
 static int amdgpu_invalidate_caches(struct ttm_bo_device *bdev, uint32_t flags)
 {
 	return 0;
@@ -1664,10 +1714,14 @@ int amdgpu_ttm_init(struct amdgpu_device *adev)
 	int r;
 	u64 vis_vram_limit;
 
-	mutex_init(&adev->mman.gtt_window_lock);
-
+	/* initialize global references for vram/gtt */
+	r = amdgpu_ttm_global_init(adev);
+	if (r) {
+		return r;
+	}
 	/* No others user of address space so set it to 0 */
 	r = ttm_bo_device_init(&adev->mman.bdev,
+			       adev->mman.bo_global_ref.ref.object,
 			       &amdgpu_bo_driver,
 			       adev->ddev->anon_inode->i_mapping,
 			       DRM_FILE_PAGE_OFFSET,
@@ -1824,6 +1878,7 @@ void amdgpu_ttm_fini(struct amdgpu_device *adev)
 	ttm_bo_clean_mm(&adev->mman.bdev, AMDGPU_PL_GWS);
 	ttm_bo_clean_mm(&adev->mman.bdev, AMDGPU_PL_OA);
 	ttm_bo_device_release(&adev->mman.bdev);
+	amdgpu_ttm_global_fini(adev);
 	adev->mman.initialized = false;
 	DRM_INFO("amdgpu: ttm finalized\n");
 }
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h
index b5b2d101f7db..e114f209b701 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h
@@ -39,6 +39,7 @@
 #define AMDGPU_GTT_NUM_TRANSFER_WINDOWS	2
 
 struct amdgpu_mman {
+	struct ttm_bo_global_ref        bo_global_ref;
 	struct ttm_bo_device		bdev;
 	bool				mem_global_referenced;
 	bool				initialized;
diff --git a/drivers/gpu/drm/ast/ast_drv.h b/drivers/gpu/drm/ast/ast_drv.h
index bfc65040dfcb..6ae11a477643 100644
--- a/drivers/gpu/drm/ast/ast_drv.h
+++ b/drivers/gpu/drm/ast/ast_drv.h
@@ -104,6 +104,7 @@ struct ast_private {
 	int fb_mtrr;
 
 	struct {
+		struct ttm_bo_global_ref bo_global_ref;
 		struct ttm_bo_device bdev;
 	} ttm;
 
diff --git a/drivers/gpu/drm/ast/ast_ttm.c b/drivers/gpu/drm/ast/ast_ttm.c
index c168d62fe8f9..8a59d6fc1160 100644
--- a/drivers/gpu/drm/ast/ast_ttm.c
+++ b/drivers/gpu/drm/ast/ast_ttm.c
@@ -36,6 +36,35 @@ ast_bdev(struct ttm_bo_device *bd)
 	return container_of(bd, struct ast_private, ttm.bdev);
 }
 
+static int ast_ttm_global_init(struct ast_private *ast)
+{
+	struct drm_global_reference *global_ref;
+	int r;
+
+	global_ref = &ast->ttm.bo_global_ref.ref;
+	global_ref->global_type = DRM_GLOBAL_TTM_BO;
+	global_ref->size = sizeof(struct ttm_bo_global);
+	global_ref->init = &ttm_bo_global_ref_init;
+	global_ref->release = &ttm_bo_global_ref_release;
+	r = drm_global_item_ref(global_ref);
+	if (r != 0) {
+		DRM_ERROR("Failed setting up TTM BO subsystem.\n");
+		return r;
+	}
+	return 0;
+}
+
+static void
+ast_ttm_global_release(struct ast_private *ast)
+{
+	if (ast->ttm.bo_global_ref.ref.release == NULL)
+		return;
+
+	drm_global_item_unref(&ast->ttm.bo_global_ref.ref);
+	ast->ttm.bo_global_ref.ref.release = NULL;
+}
+
+
 static void ast_bo_ttm_destroy(struct ttm_buffer_object *tbo)
 {
 	struct ast_bo *bo;
@@ -175,7 +204,12 @@ int ast_mm_init(struct ast_private *ast)
 	struct drm_device *dev = ast->dev;
 	struct ttm_bo_device *bdev = &ast->ttm.bdev;
 
+	ret = ast_ttm_global_init(ast);
+	if (ret)
+		return ret;
+
 	ret = ttm_bo_device_init(&ast->ttm.bdev,
+				 ast->ttm.bo_global_ref.ref.object,
 				 &ast_bo_driver,
 				 dev->anon_inode->i_mapping,
 				 DRM_FILE_PAGE_OFFSET,
@@ -206,6 +240,8 @@ void ast_mm_fini(struct ast_private *ast)
 
 	ttm_bo_device_release(&ast->ttm.bdev);
 
+	ast_ttm_global_release(ast);
+
 	arch_phys_wc_del(ast->fb_mtrr);
 	arch_io_free_memtype_wc(pci_resource_start(dev->pdev, 0),
 				pci_resource_len(dev->pdev, 0));
diff --git a/drivers/gpu/drm/bochs/bochs.h b/drivers/gpu/drm/bochs/bochs.h
index fb38c8b857b5..c1d88ea6b419 100644
--- a/drivers/gpu/drm/bochs/bochs.h
+++ b/drivers/gpu/drm/bochs/bochs.h
@@ -77,6 +77,7 @@ struct bochs_device {
 
 	/* ttm */
 	struct {
+		struct ttm_bo_global_ref bo_global_ref;
 		struct ttm_bo_device bdev;
 		bool initialized;
 	} ttm;
diff --git a/drivers/gpu/drm/bochs/bochs_mm.c b/drivers/gpu/drm/bochs/bochs_mm.c
index 0980411e41bf..cad65774a973 100644
--- a/drivers/gpu/drm/bochs/bochs_mm.c
+++ b/drivers/gpu/drm/bochs/bochs_mm.c
@@ -16,6 +16,35 @@ static inline struct bochs_device *bochs_bdev(struct ttm_bo_device *bd)
 	return container_of(bd, struct bochs_device, ttm.bdev);
 }
 
+static int bochs_ttm_global_init(struct bochs_device *bochs)
+{
+	struct drm_global_reference *global_ref;
+	int r;
+
+	global_ref = &bochs->ttm.bo_global_ref.ref;
+	global_ref->global_type = DRM_GLOBAL_TTM_BO;
+	global_ref->size = sizeof(struct ttm_bo_global);
+	global_ref->init = &ttm_bo_global_ref_init;
+	global_ref->release = &ttm_bo_global_ref_release;
+	r = drm_global_item_ref(global_ref);
+	if (r != 0) {
+		DRM_ERROR("Failed setting up TTM BO subsystem.\n");
+		return r;
+	}
+
+	return 0;
+}
+
+static void bochs_ttm_global_release(struct bochs_device *bochs)
+{
+	if (bochs->ttm.bo_global_ref.ref.release == NULL)
+		return;
+
+	drm_global_item_unref(&bochs->ttm.bo_global_ref.ref);
+	bochs->ttm.bo_global_ref.ref.release = NULL;
+}
+
+
 static void bochs_bo_ttm_destroy(struct ttm_buffer_object *tbo)
 {
 	struct bochs_bo *bo;
@@ -153,7 +182,12 @@ int bochs_mm_init(struct bochs_device *bochs)
 	struct ttm_bo_device *bdev = &bochs->ttm.bdev;
 	int ret;
 
+	ret = bochs_ttm_global_init(bochs);
+	if (ret)
+		return ret;
+
 	ret = ttm_bo_device_init(&bochs->ttm.bdev,
+				 bochs->ttm.bo_global_ref.ref.object,
 				 &bochs_bo_driver,
 				 bochs->dev->anon_inode->i_mapping,
 				 DRM_FILE_PAGE_OFFSET,
@@ -180,6 +214,7 @@ void bochs_mm_fini(struct bochs_device *bochs)
 		return;
 
 	ttm_bo_device_release(&bochs->ttm.bdev);
+	bochs_ttm_global_release(bochs);
 	bochs->ttm.initialized = false;
 }
 
diff --git a/drivers/gpu/drm/cirrus/cirrus_drv.h b/drivers/gpu/drm/cirrus/cirrus_drv.h
index f2b2e0d169fa..01852fbda9da 100644
--- a/drivers/gpu/drm/cirrus/cirrus_drv.h
+++ b/drivers/gpu/drm/cirrus/cirrus_drv.h
@@ -136,6 +136,7 @@ struct cirrus_device {
 	int fb_mtrr;
 
 	struct {
+		struct ttm_bo_global_ref bo_global_ref;
 		struct ttm_bo_device bdev;
 	} ttm;
 	bool mm_inited;
diff --git a/drivers/gpu/drm/cirrus/cirrus_ttm.c b/drivers/gpu/drm/cirrus/cirrus_ttm.c
index e075810b4bd4..7801c56c3c9b 100644
--- a/drivers/gpu/drm/cirrus/cirrus_ttm.c
+++ b/drivers/gpu/drm/cirrus/cirrus_ttm.c
@@ -36,6 +36,35 @@ cirrus_bdev(struct ttm_bo_device *bd)
 	return container_of(bd, struct cirrus_device, ttm.bdev);
 }
 
+static int cirrus_ttm_global_init(struct cirrus_device *cirrus)
+{
+	struct drm_global_reference *global_ref;
+	int r;
+
+	global_ref = &cirrus->ttm.bo_global_ref.ref;
+	global_ref->global_type = DRM_GLOBAL_TTM_BO;
+	global_ref->size = sizeof(struct ttm_bo_global);
+	global_ref->init = &ttm_bo_global_ref_init;
+	global_ref->release = &ttm_bo_global_ref_release;
+	r = drm_global_item_ref(global_ref);
+	if (r != 0) {
+		DRM_ERROR("Failed setting up TTM BO subsystem.\n");
+		return r;
+	}
+	return 0;
+}
+
+static void
+cirrus_ttm_global_release(struct cirrus_device *cirrus)
+{
+	if (cirrus->ttm.bo_global_ref.ref.release == NULL)
+		return;
+
+	drm_global_item_unref(&cirrus->ttm.bo_global_ref.ref);
+	cirrus->ttm.bo_global_ref.ref.release = NULL;
+}
+
+
 static void cirrus_bo_ttm_destroy(struct ttm_buffer_object *tbo)
 {
 	struct cirrus_bo *bo;
@@ -175,7 +204,12 @@ int cirrus_mm_init(struct cirrus_device *cirrus)
 	struct drm_device *dev = cirrus->dev;
 	struct ttm_bo_device *bdev = &cirrus->ttm.bdev;
 
+	ret = cirrus_ttm_global_init(cirrus);
+	if (ret)
+		return ret;
+
 	ret = ttm_bo_device_init(&cirrus->ttm.bdev,
+				 cirrus->ttm.bo_global_ref.ref.object,
 				 &cirrus_bo_driver,
 				 dev->anon_inode->i_mapping,
 				 DRM_FILE_PAGE_OFFSET,
@@ -211,6 +245,8 @@ void cirrus_mm_fini(struct cirrus_device *cirrus)
 
 	ttm_bo_device_release(&cirrus->ttm.bdev);
 
+	cirrus_ttm_global_release(cirrus);
+
 	arch_phys_wc_del(cirrus->fb_mtrr);
 	cirrus->fb_mtrr = 0;
 	arch_io_free_memtype_wc(pci_resource_start(dev->pdev, 0),
diff --git a/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.h b/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.h
index 3c168ae77b0c..60479502e277 100644
--- a/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.h
+++ b/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.h
@@ -49,6 +49,7 @@ struct hibmc_drm_private {
 	bool mode_config_initialized;
 
 	/* ttm */
+	struct ttm_bo_global_ref bo_global_ref;
 	struct ttm_bo_device bdev;
 	bool initialized;
 
diff --git a/drivers/gpu/drm/hisilicon/hibmc/hibmc_ttm.c b/drivers/gpu/drm/hisilicon/hibmc/hibmc_ttm.c
index dd383267884c..14071c849121 100644
--- a/drivers/gpu/drm/hisilicon/hibmc/hibmc_ttm.c
+++ b/drivers/gpu/drm/hisilicon/hibmc/hibmc_ttm.c
@@ -29,6 +29,32 @@ hibmc_bdev(struct ttm_bo_device *bd)
 	return container_of(bd, struct hibmc_drm_private, bdev);
 }
 
+static int hibmc_ttm_global_init(struct hibmc_drm_private *hibmc)
+{
+	int ret;
+
+	hibmc->bo_global_ref.ref.global_type = DRM_GLOBAL_TTM_BO;
+	hibmc->bo_global_ref.ref.size = sizeof(struct ttm_bo_global);
+	hibmc->bo_global_ref.ref.init = &ttm_bo_global_ref_init;
+	hibmc->bo_global_ref.ref.release = &ttm_bo_global_ref_release;
+	ret = drm_global_item_ref(&hibmc->bo_global_ref.ref);
+	if (ret) {
+		DRM_ERROR("failed setting up TTM BO subsystem: %d\n", ret);
+		return ret;
+	}
+	return 0;
+}
+
+static void
+hibmc_ttm_global_release(struct hibmc_drm_private *hibmc)
+{
+	if (hibmc->bo_global_ref.ref.release == NULL)
+		return;
+
+	drm_global_item_unref(&hibmc->bo_global_ref.ref);
+	hibmc->bo_global_ref.ref.release = NULL;
+}
+
 static void hibmc_bo_ttm_destroy(struct ttm_buffer_object *tbo)
 {
 	struct hibmc_bo *bo = container_of(tbo, struct hibmc_bo, bo);
@@ -188,12 +214,18 @@ int hibmc_mm_init(struct hibmc_drm_private *hibmc)
 	struct drm_device *dev = hibmc->dev;
 	struct ttm_bo_device *bdev = &hibmc->bdev;
 
+	ret = hibmc_ttm_global_init(hibmc);
+	if (ret)
+		return ret;
+
 	ret = ttm_bo_device_init(&hibmc->bdev,
+				 hibmc->bo_global_ref.ref.object,
 				 &hibmc_bo_driver,
 				 dev->anon_inode->i_mapping,
 				 DRM_FILE_PAGE_OFFSET,
 				 true);
 	if (ret) {
+		hibmc_ttm_global_release(hibmc);
 		DRM_ERROR("error initializing bo driver: %d\n", ret);
 		return ret;
 	}
@@ -201,6 +233,7 @@ int hibmc_mm_init(struct hibmc_drm_private *hibmc)
 	ret = ttm_bo_init_mm(bdev, TTM_PL_VRAM,
 			     hibmc->fb_size >> PAGE_SHIFT);
 	if (ret) {
+		hibmc_ttm_global_release(hibmc);
 		DRM_ERROR("failed ttm VRAM init: %d\n", ret);
 		return ret;
 	}
@@ -215,6 +248,7 @@ void hibmc_mm_fini(struct hibmc_drm_private *hibmc)
 		return;
 
 	ttm_bo_device_release(&hibmc->bdev);
+	hibmc_ttm_global_release(hibmc);
 	hibmc->mm_inited = false;
 }
 
diff --git a/drivers/gpu/drm/mgag200/mgag200_drv.h b/drivers/gpu/drm/mgag200/mgag200_drv.h
index 0aaedc554879..e5348955a3cc 100644
--- a/drivers/gpu/drm/mgag200/mgag200_drv.h
+++ b/drivers/gpu/drm/mgag200/mgag200_drv.h
@@ -212,6 +212,7 @@ struct mga_device {
 	int fb_mtrr;
 
 	struct {
+		struct ttm_bo_global_ref bo_global_ref;
 		struct ttm_bo_device bdev;
 	} ttm;
 
diff --git a/drivers/gpu/drm/mgag200/mgag200_ttm.c b/drivers/gpu/drm/mgag200/mgag200_ttm.c
index d96a9b32455e..11bdc8121a7d 100644
--- a/drivers/gpu/drm/mgag200/mgag200_ttm.c
+++ b/drivers/gpu/drm/mgag200/mgag200_ttm.c
@@ -36,6 +36,35 @@ mgag200_bdev(struct ttm_bo_device *bd)
 	return container_of(bd, struct mga_device, ttm.bdev);
 }
 
+static int mgag200_ttm_global_init(struct mga_device *ast)
+{
+	struct drm_global_reference *global_ref;
+	int r;
+
+	global_ref = &ast->ttm.bo_global_ref.ref;
+	global_ref->global_type = DRM_GLOBAL_TTM_BO;
+	global_ref->size = sizeof(struct ttm_bo_global);
+	global_ref->init = &ttm_bo_global_ref_init;
+	global_ref->release = &ttm_bo_global_ref_release;
+	r = drm_global_item_ref(global_ref);
+	if (r != 0) {
+		DRM_ERROR("Failed setting up TTM BO subsystem.\n");
+		return r;
+	}
+	return 0;
+}
+
+static void
+mgag200_ttm_global_release(struct mga_device *ast)
+{
+	if (ast->ttm.bo_global_ref.ref.release == NULL)
+		return;
+
+	drm_global_item_unref(&ast->ttm.bo_global_ref.ref);
+	ast->ttm.bo_global_ref.ref.release = NULL;
+}
+
+
 static void mgag200_bo_ttm_destroy(struct ttm_buffer_object *tbo)
 {
 	struct mgag200_bo *bo;
@@ -175,7 +204,12 @@ int mgag200_mm_init(struct mga_device *mdev)
 	struct drm_device *dev = mdev->dev;
 	struct ttm_bo_device *bdev = &mdev->ttm.bdev;
 
+	ret = mgag200_ttm_global_init(mdev);
+	if (ret)
+		return ret;
+
 	ret = ttm_bo_device_init(&mdev->ttm.bdev,
+				 mdev->ttm.bo_global_ref.ref.object,
 				 &mgag200_bo_driver,
 				 dev->anon_inode->i_mapping,
 				 DRM_FILE_PAGE_OFFSET,
@@ -206,6 +240,8 @@ void mgag200_mm_fini(struct mga_device *mdev)
 
 	ttm_bo_device_release(&mdev->ttm.bdev);
 
+	mgag200_ttm_global_release(mdev);
+
 	arch_io_free_memtype_wc(pci_resource_start(dev->pdev, 0),
 				pci_resource_len(dev->pdev, 0));
 	arch_phys_wc_del(mdev->fb_mtrr);
diff --git a/drivers/gpu/drm/nouveau/nouveau_drv.h b/drivers/gpu/drm/nouveau/nouveau_drv.h
index d20b9ba4b1c1..0f3bb1a11fc9 100644
--- a/drivers/gpu/drm/nouveau/nouveau_drv.h
+++ b/drivers/gpu/drm/nouveau/nouveau_drv.h
@@ -146,6 +146,7 @@ struct nouveau_drm {
 
 	/* TTM interface support */
 	struct {
+		struct ttm_bo_global_ref bo_global_ref;
 		struct ttm_bo_device bdev;
 		atomic_t validate_sequence;
 		int (*move)(struct nouveau_channel *,
diff --git a/drivers/gpu/drm/nouveau/nouveau_ttm.c b/drivers/gpu/drm/nouveau/nouveau_ttm.c
index 1543c2f8d3d3..69448b02649e 100644
--- a/drivers/gpu/drm/nouveau/nouveau_ttm.c
+++ b/drivers/gpu/drm/nouveau/nouveau_ttm.c
@@ -174,6 +174,38 @@ nouveau_ttm_mmap(struct file *filp, struct vm_area_struct *vma)
 	return ttm_bo_mmap(filp, vma, &drm->ttm.bdev);
 }
 
+int
+nouveau_ttm_global_init(struct nouveau_drm *drm)
+{
+	struct drm_global_reference *global_ref;
+	int ret;
+
+	global_ref = &drm->ttm.bo_global_ref.ref;
+	global_ref->global_type = DRM_GLOBAL_TTM_BO;
+	global_ref->size = sizeof(struct ttm_bo_global);
+	global_ref->init = &ttm_bo_global_ref_init;
+	global_ref->release = &ttm_bo_global_ref_release;
+
+	ret = drm_global_item_ref(global_ref);
+	if (unlikely(ret != 0)) {
+		DRM_ERROR("Failed setting up TTM BO subsystem\n");
+		drm->ttm.bo_global_ref.ref.release = NULL;
+		return ret;
+	}
+
+	return 0;
+}
+
+void
+nouveau_ttm_global_release(struct nouveau_drm *drm)
+{
+	if (drm->ttm.bo_global_ref.ref.release == NULL)
+		return;
+
+	drm_global_item_unref(&drm->ttm.bo_global_ref.ref);
+	drm->ttm.bo_global_ref.ref.release = NULL;
+}
+
 static int
 nouveau_ttm_init_host(struct nouveau_drm *drm, u8 kind)
 {
@@ -236,7 +268,12 @@ nouveau_ttm_init(struct nouveau_drm *drm)
 		drm->agp.cma = pci->agp.cma;
 	}
 
+	ret = nouveau_ttm_global_init(drm);
+	if (ret)
+		return ret;
+
 	ret = ttm_bo_device_init(&drm->ttm.bdev,
+				  drm->ttm.bo_global_ref.ref.object,
 				  &nouveau_bo_driver,
 				  dev->anon_inode->i_mapping,
 				  DRM_FILE_PAGE_OFFSET,
@@ -291,6 +328,8 @@ nouveau_ttm_fini(struct nouveau_drm *drm)
 
 	ttm_bo_device_release(&drm->ttm.bdev);
 
+	nouveau_ttm_global_release(drm);
+
 	arch_phys_wc_del(drm->ttm.mtrr);
 	drm->ttm.mtrr = 0;
 	arch_io_free_memtype_wc(device->func->resource_addr(device, 1),
diff --git a/drivers/gpu/drm/qxl/qxl_drv.h b/drivers/gpu/drm/qxl/qxl_drv.h
index 13a0254b59a1..ac9374028b7d 100644
--- a/drivers/gpu/drm/qxl/qxl_drv.h
+++ b/drivers/gpu/drm/qxl/qxl_drv.h
@@ -126,6 +126,8 @@ struct qxl_output {
 #define drm_encoder_to_qxl_output(x) container_of(x, struct qxl_output, enc)
 
 struct qxl_mman {
+	struct ttm_bo_global_ref        bo_global_ref;
+	bool				mem_global_referenced;
 	struct ttm_bo_device		bdev;
 };
 
diff --git a/drivers/gpu/drm/qxl/qxl_ttm.c b/drivers/gpu/drm/qxl/qxl_ttm.c
index 886f61e94f24..b7c4eb3bd179 100644
--- a/drivers/gpu/drm/qxl/qxl_ttm.c
+++ b/drivers/gpu/drm/qxl/qxl_ttm.c
@@ -46,6 +46,34 @@ static struct qxl_device *qxl_get_qdev(struct ttm_bo_device *bdev)
 	return qdev;
 }
 
+static int qxl_ttm_global_init(struct qxl_device *qdev)
+{
+	struct drm_global_reference *global_ref;
+	int r;
+
+	global_ref = &qdev->mman.bo_global_ref.ref;
+	global_ref->global_type = DRM_GLOBAL_TTM_BO;
+	global_ref->size = sizeof(struct ttm_bo_global);
+	global_ref->init = &ttm_bo_global_ref_init;
+	global_ref->release = &ttm_bo_global_ref_release;
+	r = drm_global_item_ref(global_ref);
+	if (r != 0) {
+		DRM_ERROR("Failed setting up TTM BO subsystem.\n");
+		return r;
+	}
+
+	qdev->mman.mem_global_referenced = true;
+	return 0;
+}
+
+static void qxl_ttm_global_fini(struct qxl_device *qdev)
+{
+	if (qdev->mman.mem_global_referenced) {
+		drm_global_item_unref(&qdev->mman.bo_global_ref.ref);
+		qdev->mman.mem_global_referenced = false;
+	}
+}
+
 static struct vm_operations_struct qxl_ttm_vm_ops;
 static const struct vm_operations_struct *ttm_vm_ops;
 
@@ -316,8 +344,12 @@ int qxl_ttm_init(struct qxl_device *qdev)
 	int r;
 	int num_io_pages; /* != rom->num_io_pages, we include surface0 */
 
+	r = qxl_ttm_global_init(qdev);
+	if (r)
+		return r;
 	/* No others user of address space so set it to 0 */
 	r = ttm_bo_device_init(&qdev->mman.bdev,
+			       qdev->mman.bo_global_ref.ref.object,
 			       &qxl_bo_driver,
 			       qdev->ddev.anon_inode->i_mapping,
 			       DRM_FILE_PAGE_OFFSET, 0);
@@ -353,6 +385,7 @@ void qxl_ttm_fini(struct qxl_device *qdev)
 	ttm_bo_clean_mm(&qdev->mman.bdev, TTM_PL_VRAM);
 	ttm_bo_clean_mm(&qdev->mman.bdev, TTM_PL_PRIV);
 	ttm_bo_device_release(&qdev->mman.bdev);
+	qxl_ttm_global_fini(qdev);
 	DRM_INFO("qxl: ttm finalized\n");
 }
 
diff --git a/drivers/gpu/drm/radeon/radeon.h b/drivers/gpu/drm/radeon/radeon.h
index 32808e50be12..06fb952b6290 100644
--- a/drivers/gpu/drm/radeon/radeon.h
+++ b/drivers/gpu/drm/radeon/radeon.h
@@ -448,7 +448,9 @@ struct radeon_surface_reg {
  * TTM.
  */
 struct radeon_mman {
+	struct ttm_bo_global_ref        bo_global_ref;
 	struct ttm_bo_device		bdev;
+	bool				mem_global_referenced;
 	bool				initialized;
 
 #if defined(CONFIG_DEBUG_FS)
diff --git a/drivers/gpu/drm/radeon/radeon_ttm.c b/drivers/gpu/drm/radeon/radeon_ttm.c
index 9920a6fc11bf..2104429ddbac 100644
--- a/drivers/gpu/drm/radeon/radeon_ttm.c
+++ b/drivers/gpu/drm/radeon/radeon_ttm.c
@@ -60,6 +60,39 @@ static struct radeon_device *radeon_get_rdev(struct ttm_bo_device *bdev)
 	return rdev;
 }
 
+
+/*
+ * Global memory.
+ */
+static int radeon_ttm_global_init(struct radeon_device *rdev)
+{
+	struct drm_global_reference *global_ref;
+	int r;
+
+	rdev->mman.mem_global_referenced = false;
+	global_ref = &rdev->mman.bo_global_ref.ref;
+	global_ref->global_type = DRM_GLOBAL_TTM_BO;
+	global_ref->size = sizeof(struct ttm_bo_global);
+	global_ref->init = &ttm_bo_global_ref_init;
+	global_ref->release = &ttm_bo_global_ref_release;
+	r = drm_global_item_ref(global_ref);
+	if (r != 0) {
+		DRM_ERROR("Failed setting up TTM BO subsystem.\n");
+		return r;
+	}
+
+	rdev->mman.mem_global_referenced = true;
+	return 0;
+}
+
+static void radeon_ttm_global_fini(struct radeon_device *rdev)
+{
+	if (rdev->mman.mem_global_referenced) {
+		drm_global_item_unref(&rdev->mman.bo_global_ref.ref);
+		rdev->mman.mem_global_referenced = false;
+	}
+}
+
 static int radeon_invalidate_caches(struct ttm_bo_device *bdev, uint32_t flags)
 {
 	return 0;
@@ -788,8 +821,13 @@ int radeon_ttm_init(struct radeon_device *rdev)
 {
 	int r;
 
+	r = radeon_ttm_global_init(rdev);
+	if (r) {
+		return r;
+	}
 	/* No others user of address space so set it to 0 */
 	r = ttm_bo_device_init(&rdev->mman.bdev,
+			       rdev->mman.bo_global_ref.ref.object,
 			       &radeon_bo_driver,
 			       rdev->ddev->anon_inode->i_mapping,
 			       DRM_FILE_PAGE_OFFSET,
@@ -861,6 +899,7 @@ void radeon_ttm_fini(struct radeon_device *rdev)
 	ttm_bo_clean_mm(&rdev->mman.bdev, TTM_PL_TT);
 	ttm_bo_device_release(&rdev->mman.bdev);
 	radeon_gart_fini(rdev);
+	radeon_ttm_global_fini(rdev);
 	rdev->mman.initialized = false;
 	DRM_INFO("radeon: ttm finalized\n");
 }
diff --git a/drivers/gpu/drm/ttm/ttm_bo.c b/drivers/gpu/drm/ttm/ttm_bo.c
index 0ec08394e17a..57c89161b5c6 100644
--- a/drivers/gpu/drm/ttm/ttm_bo.c
+++ b/drivers/gpu/drm/ttm/ttm_bo.c
@@ -1530,7 +1530,7 @@ static void ttm_bo_global_kobj_release(struct kobject *kobj)
 	__free_page(glob->dummy_read_page);
 }
 
-static void ttm_bo_global_release(void)
+void ttm_bo_global_release(void)
 {
 	struct ttm_bo_global *glob = &ttm_bo_glob;
 
@@ -1544,8 +1544,9 @@ static void ttm_bo_global_release(void)
 out:
 	mutex_unlock(&ttm_global_mutex);
 }
+EXPORT_SYMBOL(ttm_bo_global_release);
 
-static int ttm_bo_global_init(void)
+int ttm_bo_global_init(void)
 {
 	struct ttm_bo_global *glob = &ttm_bo_glob;
 	int ret = 0;
@@ -1582,6 +1583,8 @@ static int ttm_bo_global_init(void)
 	mutex_unlock(&ttm_global_mutex);
 	return ret;
 }
+EXPORT_SYMBOL(ttm_bo_global_init);
+
 
 int ttm_bo_device_release(struct ttm_bo_device *bdev)
 {
@@ -1620,25 +1623,18 @@ int ttm_bo_device_release(struct ttm_bo_device *bdev)
 
 	drm_vma_offset_manager_destroy(&bdev->vma_manager);
 
-	if (!ret)
-		ttm_bo_global_release();
-
 	return ret;
 }
 EXPORT_SYMBOL(ttm_bo_device_release);
 
 int ttm_bo_device_init(struct ttm_bo_device *bdev,
+		       struct ttm_bo_global *glob,
 		       struct ttm_bo_driver *driver,
 		       struct address_space *mapping,
 		       uint64_t file_page_offset,
 		       bool need_dma32)
 {
-	struct ttm_bo_global *glob = &ttm_bo_glob;
-	int ret;
-
-	ret = ttm_bo_global_init();
-	if (ret)
-		return ret;
+	int ret = -EINVAL;
 
 	bdev->driver = driver;
 
@@ -1665,7 +1661,6 @@ int ttm_bo_device_init(struct ttm_bo_device *bdev,
 
 	return 0;
 out_no_sys:
-	ttm_bo_global_release();
 	return ret;
 }
 EXPORT_SYMBOL(ttm_bo_device_init);
diff --git a/drivers/gpu/drm/virtio/virtgpu_drv.h b/drivers/gpu/drm/virtio/virtgpu_drv.h
index 0c15000f926e..74628b5cf4e2 100644
--- a/drivers/gpu/drm/virtio/virtgpu_drv.h
+++ b/drivers/gpu/drm/virtio/virtgpu_drv.h
@@ -145,6 +145,8 @@ struct virtio_gpu_fbdev {
 };
 
 struct virtio_gpu_mman {
+	struct ttm_bo_global_ref        bo_global_ref;
+	bool				mem_global_referenced;
 	struct ttm_bo_device		bdev;
 };
 
diff --git a/drivers/gpu/drm/virtio/virtgpu_ttm.c b/drivers/gpu/drm/virtio/virtgpu_ttm.c
index 4bfbf25fabff..5fecf55ff1ce 100644
--- a/drivers/gpu/drm/virtio/virtgpu_ttm.c
+++ b/drivers/gpu/drm/virtio/virtgpu_ttm.c
@@ -50,6 +50,35 @@ virtio_gpu_device *virtio_gpu_get_vgdev(struct ttm_bo_device *bdev)
 	return vgdev;
 }
 
+static int virtio_gpu_ttm_global_init(struct virtio_gpu_device *vgdev)
+{
+	struct drm_global_reference *global_ref;
+	int r;
+
+	vgdev->mman.mem_global_referenced = false;
+	global_ref = &vgdev->mman.bo_global_ref.ref;
+	global_ref->global_type = DRM_GLOBAL_TTM_BO;
+	global_ref->size = sizeof(struct ttm_bo_global);
+	global_ref->init = &ttm_bo_global_ref_init;
+	global_ref->release = &ttm_bo_global_ref_release;
+	r = drm_global_item_ref(global_ref);
+	if (r != 0) {
+		DRM_ERROR("Failed setting up TTM BO subsystem.\n");
+		return r;
+	}
+
+	vgdev->mman.mem_global_referenced = true;
+	return 0;
+}
+
+static void virtio_gpu_ttm_global_fini(struct virtio_gpu_device *vgdev)
+{
+	if (vgdev->mman.mem_global_referenced) {
+		drm_global_item_unref(&vgdev->mman.bo_global_ref.ref);
+		vgdev->mman.mem_global_referenced = false;
+	}
+}
+
 int virtio_gpu_mmap(struct file *filp, struct vm_area_struct *vma)
 {
 	struct drm_file *file_priv;
@@ -326,8 +355,12 @@ int virtio_gpu_ttm_init(struct virtio_gpu_device *vgdev)
 {
 	int r;
 
+	r = virtio_gpu_ttm_global_init(vgdev);
+	if (r)
+		return r;
 	/* No others user of address space so set it to 0 */
 	r = ttm_bo_device_init(&vgdev->mman.bdev,
+			       vgdev->mman.bo_global_ref.ref.object,
 			       &virtio_gpu_bo_driver,
 			       vgdev->ddev->anon_inode->i_mapping,
 			       DRM_FILE_PAGE_OFFSET, 0);
@@ -346,11 +379,13 @@ int virtio_gpu_ttm_init(struct virtio_gpu_device *vgdev)
 err_mm_init:
 	ttm_bo_device_release(&vgdev->mman.bdev);
 err_dev_init:
+	virtio_gpu_ttm_global_fini(vgdev);
 	return r;
 }
 
 void virtio_gpu_ttm_fini(struct virtio_gpu_device *vgdev)
 {
 	ttm_bo_device_release(&vgdev->mman.bdev);
+	virtio_gpu_ttm_global_fini(vgdev);
 	DRM_INFO("virtio_gpu: ttm finalized\n");
 }
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c b/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c
index 7ef5dcb06104..e24d9771e056 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c
@@ -785,6 +785,11 @@ static int vmw_driver_load(struct drm_device *dev, unsigned long chipset)
 	DRM_INFO("MMIO at 0x%08x size is %u kiB\n",
 		 dev_priv->mmio_start, dev_priv->mmio_size / 1024);
 
+	ret = vmw_ttm_global_init(dev_priv);
+	if (unlikely(ret != 0))
+		goto out_err0;
+
+
 	vmw_master_init(&dev_priv->fbdev_master);
 	ttm_lock_set_kill(&dev_priv->fbdev_master.lock, false, SIGTERM);
 	dev_priv->active_master = &dev_priv->fbdev_master;
@@ -795,7 +800,7 @@ static int vmw_driver_load(struct drm_device *dev, unsigned long chipset)
 	if (unlikely(dev_priv->mmio_virt == NULL)) {
 		ret = -ENOMEM;
 		DRM_ERROR("Failed mapping MMIO.\n");
-		goto out_err0;
+		goto out_err3;
 	}
 
 	/* Need mmio memory to check for fifo pitchlock cap. */
@@ -849,6 +854,7 @@ static int vmw_driver_load(struct drm_device *dev, unsigned long chipset)
 	}
 
 	ret = ttm_bo_device_init(&dev_priv->bdev,
+				 dev_priv->bo_global_ref.ref.object,
 				 &vmw_bo_driver,
 				 dev->anon_inode->i_mapping,
 				 VMWGFX_FILE_PAGE_OFFSET,
@@ -970,6 +976,8 @@ static int vmw_driver_load(struct drm_device *dev, unsigned long chipset)
 	ttm_object_device_release(&dev_priv->tdev);
 out_err4:
 	memunmap(dev_priv->mmio_virt);
+out_err3:
+	vmw_ttm_global_release(dev_priv);
 out_err0:
 	for (i = vmw_res_context; i < vmw_res_max; ++i)
 		idr_destroy(&dev_priv->res_idr[i]);
@@ -1021,6 +1029,7 @@ static void vmw_driver_unload(struct drm_device *dev)
 	memunmap(dev_priv->mmio_virt);
 	if (dev_priv->ctx.staged_bindings)
 		vmw_binding_state_free(dev_priv->ctx.staged_bindings);
+	vmw_ttm_global_release(dev_priv);
 
 	for (i = vmw_res_context; i < vmw_res_max; ++i)
 		idr_destroy(&dev_priv->res_idr[i]);
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_drv.h b/drivers/gpu/drm/vmwgfx/vmwgfx_drv.h
index cd607ba9c2fe..7a3c64bd82b3 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_drv.h
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_drv.h
@@ -417,6 +417,7 @@ enum {
 
 struct vmw_private {
 	struct ttm_bo_device bdev;
+	struct ttm_bo_global_ref bo_global_ref;
 
 	struct vmw_fifo_state fifo;
 
@@ -832,6 +833,8 @@ extern int vmw_fifo_flush(struct vmw_private *dev_priv,
  * TTM glue - vmwgfx_ttm_glue.c
  */
 
+extern int vmw_ttm_global_init(struct vmw_private *dev_priv);
+extern void vmw_ttm_global_release(struct vmw_private *dev_priv);
 extern int vmw_mmap(struct file *filp, struct vm_area_struct *vma);
 
 extern void vmw_validation_mem_init_ttm(struct vmw_private *dev_priv,
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_ttm_glue.c b/drivers/gpu/drm/vmwgfx/vmwgfx_ttm_glue.c
index e6d75e377dd8..8e3203766882 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_ttm_glue.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_ttm_glue.c
@@ -78,3 +78,30 @@ void vmw_validation_mem_init_ttm(struct vmw_private *dev_priv, size_t gran)
 	vvm->unreserve_mem = vmw_vmt_unreserve;
 	vvm->gran = gran;
 }
+
+int vmw_ttm_global_init(struct vmw_private *dev_priv)
+{
+	struct drm_global_reference *global_ref;
+	int ret;
+
+	global_ref = &dev_priv->bo_global_ref.ref;
+	global_ref->global_type = DRM_GLOBAL_TTM_BO;
+	global_ref->size = sizeof(struct ttm_bo_global);
+	global_ref->init = &ttm_bo_global_ref_init;
+	global_ref->release = &ttm_bo_global_ref_release;
+	ret = drm_global_item_ref(global_ref);
+
+	if (unlikely(ret != 0)) {
+		DRM_ERROR("Failed setting up TTM buffer objects.\n");
+		goto out_no_bo;
+	}
+
+	return 0;
+out_no_bo:
+	return ret;
+}
+
+void vmw_ttm_global_release(struct vmw_private *dev_priv)
+{
+	drm_global_item_unref(&dev_priv->bo_global_ref.ref);
+}
diff --git a/drivers/staging/vboxvideo/vbox_drv.h b/drivers/staging/vboxvideo/vbox_drv.h
index aa40e5cc2861..24e54d5dda6b 100644
--- a/drivers/staging/vboxvideo/vbox_drv.h
+++ b/drivers/staging/vboxvideo/vbox_drv.h
@@ -79,6 +79,7 @@ struct vbox_private {
 	int fb_mtrr;
 
 	struct {
+		struct ttm_bo_global_ref bo_global_ref;
 		struct ttm_bo_device bdev;
 	} ttm;
 
diff --git a/drivers/staging/vboxvideo/vbox_ttm.c b/drivers/staging/vboxvideo/vbox_ttm.c
index 30f270027acf..ceacbc1d3ff7 100644
--- a/drivers/staging/vboxvideo/vbox_ttm.c
+++ b/drivers/staging/vboxvideo/vbox_ttm.c
@@ -16,6 +16,37 @@ static inline struct vbox_private *vbox_bdev(struct ttm_bo_device *bd)
 	return container_of(bd, struct vbox_private, ttm.bdev);
 }
 
+/**
+ * Adds the vbox memory manager object/structures to the global memory manager.
+ */
+static int vbox_ttm_global_init(struct vbox_private *vbox)
+{
+	struct drm_global_reference *global_ref;
+	int ret;
+
+	global_ref = &vbox->ttm.bo_global_ref.ref;
+	global_ref->global_type = DRM_GLOBAL_TTM_BO;
+	global_ref->size = sizeof(struct ttm_bo_global);
+	global_ref->init = &ttm_bo_global_ref_init;
+	global_ref->release = &ttm_bo_global_ref_release;
+
+	ret = drm_global_item_ref(global_ref);
+	if (ret) {
+		DRM_ERROR("Failed setting up TTM BO subsystem.\n");
+		return ret;
+	}
+
+	return 0;
+}
+
+/**
+ * Removes the vbox memory manager object from the global memory manager.
+ */
+static void vbox_ttm_global_release(struct vbox_private *vbox)
+{
+	drm_global_item_unref(&vbox->ttm.bo_global_ref.ref);
+}
+
 static void vbox_bo_ttm_destroy(struct ttm_buffer_object *tbo)
 {
 	struct vbox_bo *bo;
@@ -153,13 +184,18 @@ int vbox_mm_init(struct vbox_private *vbox)
 	struct drm_device *dev = &vbox->ddev;
 	struct ttm_bo_device *bdev = &vbox->ttm.bdev;
 
+	ret = vbox_ttm_global_init(vbox);
+	if (ret)
+		return ret;
+
 	ret = ttm_bo_device_init(&vbox->ttm.bdev,
+				 vbox->ttm.bo_global_ref.ref.object,
 				 &vbox_bo_driver,
 				 dev->anon_inode->i_mapping,
 				 DRM_FILE_PAGE_OFFSET, true);
 	if (ret) {
 		DRM_ERROR("Error initialising bo driver; %d\n", ret);
-		return ret;
+		goto err_ttm_global_release;
 	}
 
 	ret = ttm_bo_init_mm(bdev, TTM_PL_VRAM,
@@ -181,6 +217,8 @@ int vbox_mm_init(struct vbox_private *vbox)
 
 err_device_release:
 	ttm_bo_device_release(&vbox->ttm.bdev);
+err_ttm_global_release:
+	vbox_ttm_global_release(vbox);
 	return ret;
 }
 
@@ -194,6 +232,7 @@ void vbox_mm_fini(struct vbox_private *vbox)
 	arch_phys_wc_del(vbox->fb_mtrr);
 #endif
 	ttm_bo_device_release(&vbox->ttm.bdev);
+	vbox_ttm_global_release(vbox);
 }
 
 void vbox_ttm_placement(struct vbox_bo *bo, int domain)
diff --git a/include/drm/ttm/ttm_bo_driver.h b/include/drm/ttm/ttm_bo_driver.h
index 6fb589f64633..26be74939f10 100644
--- a/include/drm/ttm/ttm_bo_driver.h
+++ b/include/drm/ttm/ttm_bo_driver.h
@@ -569,6 +569,9 @@ void ttm_bo_mem_put(struct ttm_buffer_object *bo, struct ttm_mem_reg *mem);
 void ttm_bo_mem_put_locked(struct ttm_buffer_object *bo,
 			   struct ttm_mem_reg *mem);
 
+void ttm_bo_global_release(void);
+int ttm_bo_global_init(void);
+
 int ttm_bo_device_release(struct ttm_bo_device *bdev);
 
 /**
@@ -586,7 +589,7 @@ int ttm_bo_device_release(struct ttm_bo_device *bdev);
  * Returns:
  * !0: Failure.
  */
-int ttm_bo_device_init(struct ttm_bo_device *bdev,
+int ttm_bo_device_init(struct ttm_bo_device *bdev, struct ttm_bo_global *glob,
 		       struct ttm_bo_driver *driver,
 		       struct address_space *mapping,
 		       uint64_t file_page_offset, bool need_dma32);
@@ -885,4 +888,40 @@ pgprot_t ttm_io_prot(uint32_t caching_flags, pgprot_t tmp);
 
 extern const struct ttm_mem_type_manager_func ttm_bo_manager_func;
 
+/**
+ * struct ttm_bo_global_ref - Argument to initialize a struct ttm_bo_global.
+ */
+
+struct ttm_bo_global_ref {
+	struct drm_global_reference ref;
+};
+
+/**
+ * ttm_bo_global_ref_init
+ *
+ * @ref: DRM global reference
+ *
+ * Helper function that initializes a struct ttm_bo_global. This function
+ * is used as init call-back function for DRM global references of type
+ * DRM_GLOBAL_TTM_BO_REF.
+ */
+static inline int ttm_bo_global_ref_init(struct drm_global_reference *ref)
+{
+	return ttm_bo_global_init();
+}
+
+/**
+ * ttm_bo_global_ref_release
+ *
+ * @ref: DRM global reference
+ *
+ * Helper function that releases a struct ttm_bo_global. This function
+ * is used as release call-back function for DRM global references of type
+ * DRM_GLOBAL_TTM_BO_REF.
+ */
+static inline void ttm_bo_global_ref_release(struct drm_global_reference *ref)
+{
+	ttm_bo_global_release();
+}
+
 #endif
-- 
2.20.1

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