Adding upstream version 7.0.14-dfsg.upstream/7.0.14-dfsg

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 843 insertions, 0 deletions

diff --git a/src/VBox/Additions/linux/drm/vbox_ttm.c b/src/VBox/Additions/linux/drm/vbox_ttm.c
new file mode 100644
index 00000000..d020aa3f
--- /dev/null
+++ b/src/VBox/Additions/linux/drm/vbox_ttm.c
@@ -0,0 +1,843 @@
+/* $Id: vbox_ttm.c $ */
+/** @file
+ * VirtualBox Additions Linux kernel video driver
+ */
+
+/*
+ * Copyright (C) 2013-2023 Oracle and/or its affiliates.
+ * This file is based on ast_ttm.c
+ * Copyright 2012 Red Hat Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sub license, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
+ * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+ * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
+ * USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial portions
+ * of the Software.
+ *
+ *
+ * Authors: Dave Airlie <airlied@redhat.com>
+ *          Michael Thayer <michael.thayer@oracle.com>
+ */
+#include "vbox_drv.h"
+
+#if RTLNX_VER_MIN(6,3,0) || RTLNX_RHEL_RANGE(8,9, 8,99) || RTLNX_RHEL_MAJ_PREREQ(9,3)
+# include <drm/ttm/ttm_tt.h>
+#endif
+
+#if RTLNX_VER_MIN(5,11,0) || RTLNX_RHEL_MAJ_PREREQ(8,5)
+# include <drm/drm_gem.h>
+# include <drm/drm_gem_ttm_helper.h>
+# include <drm/drm_gem_vram_helper.h>
+#else
+# include <drm/ttm/ttm_page_alloc.h>
+#endif
+
+#if RTLNX_VER_MIN(5,14,0) || RTLNX_RHEL_RANGE(8,6, 8,99)
+# include <drm/ttm/ttm_range_manager.h>
+#endif
+
+#if RTLNX_VER_MAX(3,18,0) && !RTLNX_RHEL_MAJ_PREREQ(7,2)
+#define PLACEMENT_FLAGS(placement) (placement)
+#else
+#define PLACEMENT_FLAGS(placement) ((placement).flags)
+#endif
+
+
+#if RTLNX_VER_MIN(5,13,0) || RTLNX_RHEL_RANGE(8,6, 8,99)
+static inline struct vbox_private *vbox_bdev(struct ttm_device *bd)
+#else
+static inline struct vbox_private *vbox_bdev(struct ttm_bo_device *bd)
+#endif
+{
+	return container_of(bd, struct vbox_private, ttm.bdev);
+}
+
+#if RTLNX_VER_MAX(5,0,0) && !RTLNX_RHEL_MAJ_PREREQ(7,7) && !RTLNX_RHEL_MAJ_PREREQ(8,1)
+static int vbox_ttm_mem_global_init(struct drm_global_reference *ref)
+{
+	return ttm_mem_global_init(ref->object);
+}
+
+static void vbox_ttm_mem_global_release(struct drm_global_reference *ref)
+{
+	ttm_mem_global_release(ref->object);
+}
+
+/**
+ * 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;
+
+#if RTLNX_VER_MAX(5,0,0)
+	global_ref = &vbox->ttm.mem_global_ref;
+	global_ref->global_type = DRM_GLOBAL_TTM_MEM;
+	global_ref->size = sizeof(struct ttm_mem_global);
+	global_ref->init = &vbox_ttm_mem_global_init;
+	global_ref->release = &vbox_ttm_mem_global_release;
+	ret = drm_global_item_ref(global_ref);
+	if (ret) {
+		DRM_ERROR("Failed setting up TTM memory subsystem.\n");
+		return ret;
+	}
+
+	vbox->ttm.bo_global_ref.mem_glob = vbox->ttm.mem_global_ref.object;
+#endif
+	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_init;
+	global_ref->release = &ttm_bo_global_release;
+
+	ret = drm_global_item_ref(global_ref);
+	if (ret) {
+		DRM_ERROR("Failed setting up TTM BO subsystem.\n");
+#if RTLNX_VER_MAX(5,0,0)
+		drm_global_item_unref(&vbox->ttm.mem_global_ref);
+#endif
+		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);
+	drm_global_item_unref(&vbox->ttm.mem_global_ref);
+}
+#endif
+
+static void vbox_bo_ttm_destroy(struct ttm_buffer_object *tbo)
+{
+	struct vbox_bo *bo;
+
+	bo = container_of(tbo, struct vbox_bo, bo);
+
+	drm_gem_object_release(&bo->gem);
+	kfree(bo);
+}
+
+static bool vbox_ttm_bo_is_vbox_bo(struct ttm_buffer_object *bo)
+{
+	if (bo->destroy == &vbox_bo_ttm_destroy)
+		return true;
+
+	return false;
+}
+
+#if RTLNX_VER_MAX(5,10,0) && !RTLNX_RHEL_MAJ_PREREQ(8,5)
+static int
+vbox_bo_init_mem_type(struct ttm_bo_device *bdev, u32 type,
+		      struct ttm_mem_type_manager *man)
+{
+	switch (type) {
+	case TTM_PL_SYSTEM:
+		man->flags = TTM_MEMTYPE_FLAG_MAPPABLE;
+		man->available_caching = TTM_PL_MASK_CACHING;
+		man->default_caching = TTM_PL_FLAG_CACHED;
+		break;
+	case TTM_PL_VRAM:
+		man->func = &ttm_bo_manager_func;
+		man->flags = TTM_MEMTYPE_FLAG_FIXED | TTM_MEMTYPE_FLAG_MAPPABLE;
+		man->available_caching = TTM_PL_FLAG_UNCACHED | TTM_PL_FLAG_WC;
+		man->default_caching = TTM_PL_FLAG_WC;
+		break;
+	default:
+		DRM_ERROR("Unsupported memory type %u\n", (unsigned int)type);
+		return -EINVAL;
+	}
+
+	return 0;
+}
+#endif
+
+static void
+vbox_bo_evict_flags(struct ttm_buffer_object *bo, struct ttm_placement *pl)
+{
+	struct vbox_bo *vboxbo = vbox_bo(bo);
+
+	if (!vbox_ttm_bo_is_vbox_bo(bo))
+		return;
+
+	vbox_ttm_placement(vboxbo, VBOX_MEM_TYPE_SYSTEM);
+	*pl = vboxbo->placement;
+}
+
+#if RTLNX_VER_MAX(5,14,0) && !RTLNX_RHEL_RANGE(8,6, 8,99)
+static int vbox_bo_verify_access(struct ttm_buffer_object *bo,
+				 struct file *filp)
+{
+	return 0;
+}
+#endif
+
+#if RTLNX_VER_MAX(5,10,0) && !RTLNX_RHEL_RANGE(8,5, 8,99)
+static int vbox_ttm_io_mem_reserve(struct ttm_bo_device *bdev,
+				   struct ttm_mem_reg *mem)
+{
+	struct vbox_private *vbox = vbox_bdev(bdev);
+	struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
+
+	mem->bus.addr = NULL;
+	mem->bus.offset = 0;
+	mem->bus.size = mem->num_pages << PAGE_SHIFT;
+	mem->bus.base = 0;
+	mem->bus.is_iomem = false;
+	if (!(man->flags & TTM_MEMTYPE_FLAG_MAPPABLE))
+		return -EINVAL;
+	switch (mem->mem_type) {
+	case TTM_PL_SYSTEM:
+		/* system memory */
+		return 0;
+	case TTM_PL_VRAM:
+		mem->bus.offset = mem->start << PAGE_SHIFT;
+		mem->bus.base = pci_resource_start(vbox->dev->pdev, 0);
+		mem->bus.is_iomem = true;
+		break;
+	default:
+		return -EINVAL;
+	}
+	return 0;
+}
+#else
+# if RTLNX_VER_MAX(5,13,0) && !RTLNX_RHEL_RANGE(8,6, 8,99)
+static int vbox_ttm_io_mem_reserve(struct ttm_bo_device *bdev,
+				   struct ttm_resource *mem)
+# else /* > 5.13.0 */
+static int vbox_ttm_io_mem_reserve(struct ttm_device *bdev,
+				   struct ttm_resource *mem)
+# endif /* > 5.13.0 */
+{
+	struct vbox_private *vbox = vbox_bdev(bdev);
+	mem->bus.addr = NULL;
+	mem->bus.offset = 0;
+# if RTLNX_VER_MAX(5,12,0) && !RTLNX_RHEL_MAJ_PREREQ(8,5)
+	mem->size = mem->num_pages << PAGE_SHIFT;
+# endif
+	mem->start = 0;
+	mem->bus.is_iomem = false;
+	switch (mem->mem_type) {
+	case TTM_PL_SYSTEM:
+		/* system memory */
+		return 0;
+	case TTM_PL_VRAM:
+# if RTLNX_VER_MIN(5,11,0) || RTLNX_RHEL_RANGE(8,5, 8,99)
+		mem->bus.caching = ttm_write_combined;
+# endif
+# if RTLNX_VER_MIN(5,10,0) || RTLNX_RHEL_RANGE(8,5, 8,99)
+		mem->bus.offset = (mem->start << PAGE_SHIFT) + pci_resource_start(VBOX_DRM_TO_PCI_DEV(vbox->dev), 0);
+# else
+		mem->bus.offset = mem->start << PAGE_SHIFT;
+		mem->start = pci_resource_start(VBOX_DRM_TO_PCI_DEV(vbox->dev), 0);
+# endif
+		mem->bus.is_iomem = true;
+		break;
+	default:
+		return -EINVAL;
+	}
+	return 0;
+}
+#endif
+
+
+
+#if RTLNX_VER_MIN(5,13,0) || RTLNX_RHEL_RANGE(8,6, 8,99)
+static void vbox_ttm_io_mem_free(struct ttm_device *bdev,
+				 struct ttm_resource *mem)
+{
+}
+#elif RTLNX_VER_MIN(5,10,0) || RTLNX_RHEL_RANGE(8,5, 8,99)
+static void vbox_ttm_io_mem_free(struct ttm_bo_device *bdev,
+				 struct ttm_resource *mem)
+{
+}
+#else
+static void vbox_ttm_io_mem_free(struct ttm_bo_device *bdev,
+				 struct ttm_mem_reg *mem)
+{
+}
+#endif
+
+#if RTLNX_VER_MIN(5,13,0) || RTLNX_RHEL_RANGE(8,6, 8,99)
+static void vbox_ttm_tt_destroy(struct ttm_device *bdev, struct ttm_tt *tt)
+{
+	ttm_tt_fini(tt);
+	kfree(tt);
+}
+#elif RTLNX_VER_MIN(5,10,0) || RTLNX_RHEL_RANGE(8,5, 8,99)
+static void vbox_ttm_tt_destroy(struct ttm_bo_device *bdev, struct ttm_tt *tt)
+{
+	ttm_tt_fini(tt);
+	kfree(tt);
+}
+#else
+static void vbox_ttm_backend_destroy(struct ttm_tt *tt)
+{
+	ttm_tt_fini(tt);
+	kfree(tt);
+}
+
+static struct ttm_backend_func vbox_tt_backend_func = {
+	.destroy = &vbox_ttm_backend_destroy,
+};
+#endif
+
+#if RTLNX_VER_MAX(4,17,0) && !RTLNX_RHEL_MAJ_PREREQ(7,6) && !RTLNX_SUSE_MAJ_PREREQ(15,1) && !RTLNX_SUSE_MAJ_PREREQ(12,5)
+static struct ttm_tt *vbox_ttm_tt_create(struct ttm_bo_device *bdev,
+					 unsigned long size,
+					 u32 page_flags,
+					 struct page *dummy_read_page)
+#else
+static struct ttm_tt *vbox_ttm_tt_create(struct ttm_buffer_object *bo,
+										 u32 page_flags)
+#endif
+{
+	struct ttm_tt *tt;
+
+	tt = kzalloc(sizeof(*tt), GFP_KERNEL);
+	if (!tt)
+		return NULL;
+
+#if RTLNX_VER_MAX(5,10,0) && !RTLNX_RHEL_RANGE(8,5, 8,99)
+	tt->func = &vbox_tt_backend_func;
+#endif
+#if RTLNX_VER_MIN(5,19,0) || RTLNX_RHEL_RANGE(8,8, 8,99) || RTLNX_RHEL_RANGE(9,2, 9,99) || RTLNX_SUSE_MAJ_PREREQ(15,5)
+	if (ttm_tt_init(tt, bo, page_flags, ttm_write_combined, 0)) {
+#elif RTLNX_VER_MIN(5,11,0) || RTLNX_RHEL_RANGE(8,5, 8,99)
+	if (ttm_tt_init(tt, bo, page_flags, ttm_write_combined)) {
+#elif RTLNX_VER_MIN(4,17,0) || RTLNX_RHEL_MAJ_PREREQ(7,6) || RTLNX_SUSE_MAJ_PREREQ(15,1) || RTLNX_SUSE_MAJ_PREREQ(12,5)
+	if (ttm_tt_init(tt, bo, page_flags)) {
+#else
+	if (ttm_tt_init(tt, bdev, size, page_flags, dummy_read_page)) {
+#endif
+
+		kfree(tt);
+		return NULL;
+	}
+
+	return tt;
+}
+
+#if RTLNX_VER_MAX(4,17,0)
+# if RTLNX_VER_MAX(4,16,0) && !RTLNX_RHEL_MAJ_PREREQ(7,6) && !RTLNX_SUSE_MAJ_PREREQ(15,1) && !RTLNX_SUSE_MAJ_PREREQ(12,5)
+static int vbox_ttm_tt_populate(struct ttm_tt *ttm)
+{
+	return ttm_pool_populate(ttm);
+}
+# else
+static int vbox_ttm_tt_populate(struct ttm_tt *ttm,
+				struct ttm_operation_ctx *ctx)
+{
+	return ttm_pool_populate(ttm, ctx);
+}
+# endif
+
+static void vbox_ttm_tt_unpopulate(struct ttm_tt *ttm)
+{
+	ttm_pool_unpopulate(ttm);
+}
+#endif
+
+#if RTLNX_VER_MIN(5,11,0) || RTLNX_RHEL_RANGE(8,5, 8,99)
+static int vbox_bo_move(struct ttm_buffer_object *bo, bool evict,
+	struct ttm_operation_ctx *ctx, struct ttm_resource *new_mem,
+	struct ttm_place *hop)
+{
+# if RTLNX_VER_MIN(6,4,0)
+	if (!bo->resource)
+	{
+		if (new_mem->mem_type != TTM_PL_SYSTEM)
+		{
+			hop->mem_type = TTM_PL_SYSTEM;
+			hop->flags = TTM_PL_FLAG_TEMPORARY;
+			return -EMULTIHOP;
+		}
+		ttm_bo_move_null(bo, new_mem);
+		return 0;
+	}
+# endif
+	return ttm_bo_move_memcpy(bo, ctx, new_mem);
+}
+#endif
+
+#if RTLNX_VER_MIN(5,13,0) || RTLNX_RHEL_RANGE(8,6, 8,99)
+static struct ttm_device_funcs vbox_bo_driver = {
+#else /* < 5.13.0 */
+static struct ttm_bo_driver vbox_bo_driver = {
+#endif /* < 5.13.0 */
+	.ttm_tt_create = vbox_ttm_tt_create,
+#if RTLNX_VER_MIN(5,10,0) || RTLNX_RHEL_RANGE(8,5, 8,99)
+	.ttm_tt_destroy = vbox_ttm_tt_destroy,
+#endif
+#if RTLNX_VER_MAX(4,17,0)
+	.ttm_tt_populate = vbox_ttm_tt_populate,
+	.ttm_tt_unpopulate = vbox_ttm_tt_unpopulate,
+#endif
+#if RTLNX_VER_MAX(5,10,0) && !RTLNX_RHEL_MAJ_PREREQ(8,5)
+	.init_mem_type = vbox_bo_init_mem_type,
+#endif
+#if RTLNX_VER_MIN(4,10,0) || RTLNX_RHEL_MAJ_PREREQ(7,4)
+	.eviction_valuable = ttm_bo_eviction_valuable,
+#endif
+	.evict_flags = vbox_bo_evict_flags,
+#if RTLNX_VER_MAX(5,14,0) && !RTLNX_RHEL_RANGE(8,6, 8,99)
+	.verify_access = vbox_bo_verify_access,
+#endif
+	.io_mem_reserve = &vbox_ttm_io_mem_reserve,
+	.io_mem_free = &vbox_ttm_io_mem_free,
+#if RTLNX_VER_MIN(4,12,0) || RTLNX_RHEL_MAJ_PREREQ(7,5)
+# if RTLNX_VER_MAX(4,16,0) && !RTLNX_RHEL_MAJ_PREREQ(7,6) && !RTLNX_SUSE_MAJ_PREREQ(15,1) && !RTLNX_SUSE_MAJ_PREREQ(12,5)
+	.io_mem_pfn = ttm_bo_default_io_mem_pfn,
+# endif
+#endif
+#if (RTLNX_VER_RANGE(4,7,0,  4,11,0) || RTLNX_RHEL_MAJ_PREREQ(7,4)) && !RTLNX_RHEL_MAJ_PREREQ(7,5)
+	.lru_tail = &ttm_bo_default_lru_tail,
+	.swap_lru_tail = &ttm_bo_default_swap_lru_tail,
+#endif
+#if RTLNX_VER_MIN(5,11,0) || RTLNX_RHEL_RANGE(8,5, 8,99)
+	.move = &vbox_bo_move,
+#endif
+};
+
+int vbox_mm_init(struct vbox_private *vbox)
+{
+	int ret;
+	struct drm_device *dev = vbox->dev;
+#if RTLNX_VER_MIN(5,13,0) || RTLNX_RHEL_RANGE(8,6, 8,99)
+	struct ttm_device *bdev = &vbox->ttm.bdev;
+#else
+	struct ttm_bo_device *bdev = &vbox->ttm.bdev;
+#endif
+
+#if RTLNX_VER_MAX(5,0,0) && !RTLNX_RHEL_MAJ_PREREQ(7,7) && !RTLNX_RHEL_MAJ_PREREQ(8,1)
+	ret = vbox_ttm_global_init(vbox);
+	if (ret)
+		return ret;
+#endif
+#if RTLNX_VER_MIN(5,13,0) || RTLNX_RHEL_RANGE(8,6, 8,99)
+	ret = ttm_device_init(&vbox->ttm.bdev,
+#else
+	ret = ttm_bo_device_init(&vbox->ttm.bdev,
+#endif
+#if RTLNX_VER_MAX(5,0,0) && !RTLNX_RHEL_MAJ_PREREQ(7,7) && !RTLNX_RHEL_MAJ_PREREQ(8,1)
+				 vbox->ttm.bo_global_ref.ref.object,
+#endif
+				 &vbox_bo_driver,
+#if RTLNX_VER_MIN(5,11,0) || RTLNX_RHEL_RANGE(8,5, 8,99)
+				 dev->dev,
+#endif
+#if RTLNX_VER_MIN(3,15,0) || RTLNX_RHEL_MAJ_PREREQ(7,1)
+				 dev->anon_inode->i_mapping,
+#endif
+#if RTLNX_VER_MIN(5,5,0) || RTLNX_RHEL_MIN(8,3) || RTLNX_SUSE_MAJ_PREREQ(15,3)
+				 dev->vma_offset_manager,
+#elif RTLNX_VER_MAX(5,2,0) && !RTLNX_RHEL_MAJ_PREREQ(8,2)
+				 DRM_FILE_PAGE_OFFSET,
+#endif
+#if RTLNX_VER_MIN(5,11,0) || RTLNX_RHEL_RANGE(8,5, 8,99)
+				 false,
+#endif
+				 true);
+	if (ret) {
+		DRM_ERROR("Error initialising bo driver; %d\n", ret);
+#if RTLNX_VER_MAX(5,0,0) && !RTLNX_RHEL_MAJ_PREREQ(7,7) && !RTLNX_RHEL_MAJ_PREREQ(8,1)
+		goto err_ttm_global_release;
+#else
+		return ret;
+#endif
+	}
+
+#if RTLNX_VER_MIN(5,10,0) || RTLNX_RHEL_RANGE(8,5, 8,99)
+	ret = ttm_range_man_init(bdev, TTM_PL_VRAM, false,
+			     vbox->available_vram_size >> PAGE_SHIFT);
+#else
+	ret = ttm_bo_init_mm(bdev, TTM_PL_VRAM,
+			     vbox->available_vram_size >> PAGE_SHIFT);
+#endif
+	if (ret) {
+		DRM_ERROR("Failed ttm VRAM init: %d\n", ret);
+		goto err_device_release;
+	}
+
+#ifdef DRM_MTRR_WC
+	vbox->fb_mtrr = drm_mtrr_add(pci_resource_start(VBOX_DRM_TO_PCI_DEV(dev), 0),
+				     pci_resource_len(VBOX_DRM_TO_PCI_DEV(dev), 0),
+				     DRM_MTRR_WC);
+#else
+	vbox->fb_mtrr = arch_phys_wc_add(pci_resource_start(VBOX_DRM_TO_PCI_DEV(dev), 0),
+					 pci_resource_len(VBOX_DRM_TO_PCI_DEV(dev), 0));
+#endif
+	return 0;
+
+err_device_release:
+#if RTLNX_VER_MIN(5,13,0) || RTLNX_RHEL_RANGE(8,6, 8,99)
+	ttm_device_fini(&vbox->ttm.bdev);
+#else
+	ttm_bo_device_release(&vbox->ttm.bdev);
+#endif
+#if RTLNX_VER_MAX(5,0,0) && !RTLNX_RHEL_MAJ_PREREQ(7,7) && !RTLNX_RHEL_MAJ_PREREQ(8,1)
+err_ttm_global_release:
+	vbox_ttm_global_release(vbox);
+#endif
+	return ret;
+}
+
+void vbox_mm_fini(struct vbox_private *vbox)
+{
+#ifdef DRM_MTRR_WC
+	drm_mtrr_del(vbox->fb_mtrr,
+		     pci_resource_start(VBOX_DRM_TO_PCI_DEV(vbox->dev), 0),
+		     pci_resource_len(VBOX_DRM_TO_PCI_DEV(vbox->dev), 0), DRM_MTRR_WC);
+#else
+	arch_phys_wc_del(vbox->fb_mtrr);
+#endif
+#if RTLNX_VER_MIN(5,13,0) || RTLNX_RHEL_RANGE(8,6, 8,99)
+	ttm_device_fini(&vbox->ttm.bdev);
+#else
+	ttm_bo_device_release(&vbox->ttm.bdev);
+#endif
+#if RTLNX_VER_MAX(5,0,0) && !RTLNX_RHEL_MAJ_PREREQ(7,7) && !RTLNX_RHEL_MAJ_PREREQ(8,1)
+	vbox_ttm_global_release(vbox);
+#endif
+}
+
+void vbox_ttm_placement(struct vbox_bo *bo, u32 mem_type)
+{
+	u32 c = 0;
+#if RTLNX_VER_MAX(3,18,0) && !RTLNX_RHEL_MAJ_PREREQ(7,2)
+	bo->placement.fpfn = 0;
+	bo->placement.lpfn = 0;
+#else
+	unsigned int i;
+#endif
+
+	bo->placement.placement = bo->placements;
+	bo->placement.busy_placement = bo->placements;
+
+	if (mem_type & VBOX_MEM_TYPE_VRAM) {
+#if RTLNX_VER_MIN(5,11,0) || RTLNX_RHEL_RANGE(8,5, 8,99)
+		bo->placements[c].mem_type = TTM_PL_VRAM;
+		PLACEMENT_FLAGS(bo->placements[c++]) = 0;
+#elif RTLNX_VER_MIN(5,10,0)
+		bo->placements[c].mem_type = TTM_PL_VRAM;
+		PLACEMENT_FLAGS(bo->placements[c++]) =
+		    TTM_PL_FLAG_WC | TTM_PL_FLAG_UNCACHED;
+#else
+		PLACEMENT_FLAGS(bo->placements[c++]) =
+		    TTM_PL_FLAG_WC | TTM_PL_FLAG_UNCACHED | TTM_PL_FLAG_VRAM;
+#endif
+	}
+	if (mem_type & VBOX_MEM_TYPE_SYSTEM) {
+#if RTLNX_VER_MIN(5,11,0) || RTLNX_RHEL_RANGE(8,5, 8,99)
+		bo->placements[c].mem_type = TTM_PL_SYSTEM;
+		PLACEMENT_FLAGS(bo->placements[c++]) = 0;
+#elif RTLNX_VER_MIN(5,10,0)
+		bo->placements[c].mem_type = TTM_PL_SYSTEM;
+		PLACEMENT_FLAGS(bo->placements[c++]) =
+		    TTM_PL_MASK_CACHING;
+#else
+		PLACEMENT_FLAGS(bo->placements[c++]) =
+		    TTM_PL_MASK_CACHING | TTM_PL_FLAG_SYSTEM;
+#endif
+	}
+	if (!c) {
+#if RTLNX_VER_MIN(5,11,0) || RTLNX_RHEL_RANGE(8,5, 8,99)
+		bo->placements[c].mem_type = TTM_PL_SYSTEM;
+		PLACEMENT_FLAGS(bo->placements[c++]) = 0;
+#elif RTLNX_VER_MIN(5,10,0)
+		bo->placements[c].mem_type = TTM_PL_SYSTEM;
+		PLACEMENT_FLAGS(bo->placements[c++]) =
+		    TTM_PL_MASK_CACHING;
+#else
+		PLACEMENT_FLAGS(bo->placements[c++]) =
+		    TTM_PL_MASK_CACHING | TTM_PL_FLAG_SYSTEM;
+#endif
+	}
+
+	bo->placement.num_placement = c;
+	bo->placement.num_busy_placement = c;
+
+#if RTLNX_VER_MIN(3,18,0) || RTLNX_RHEL_MAJ_PREREQ(7,2)
+	for (i = 0; i < c; ++i) {
+		bo->placements[i].fpfn = 0;
+		bo->placements[i].lpfn = 0;
+	}
+#endif
+}
+
+#if RTLNX_VER_MIN(5,11,0) || RTLNX_RHEL_RANGE(8,5, 8,99)
+static const struct drm_gem_object_funcs vbox_drm_gem_object_funcs = {
+	.free   = vbox_gem_free_object,
+	.print_info = drm_gem_ttm_print_info,
+# if RTLNX_VER_MIN(6,5,0)
+	.vmap   = drm_gem_ttm_vmap,
+	.vunmap = drm_gem_ttm_vunmap,
+# endif
+# if RTLNX_VER_MIN(5,14,0) || RTLNX_RHEL_RANGE(8,6, 8,99)
+	.mmap = drm_gem_ttm_mmap,
+# endif
+};
+#endif
+
+int vbox_bo_create(struct drm_device *dev, int size, int align,
+		   u32 flags, struct vbox_bo **pvboxbo)
+{
+	struct vbox_private *vbox = dev->dev_private;
+	struct vbox_bo *vboxbo;
+#if RTLNX_VER_MAX(5,13,0) && !RTLNX_RHEL_RANGE(8,6, 8,99)
+	size_t acc_size;
+#endif
+	int ret;
+
+	vboxbo = kzalloc(sizeof(*vboxbo), GFP_KERNEL);
+	if (!vboxbo)
+		return -ENOMEM;
+
+	ret = drm_gem_object_init(dev, &vboxbo->gem, size);
+	if (ret)
+		goto err_free_vboxbo;
+
+#if RTLNX_VER_MIN(5,11,0) || RTLNX_RHEL_RANGE(8,5, 8,99)
+	if (!vboxbo->gem.funcs) {
+		vboxbo->gem.funcs = &vbox_drm_gem_object_funcs;
+	}
+#endif
+	vboxbo->bo.bdev = &vbox->ttm.bdev;
+#if RTLNX_VER_MAX(3,15,0) && !RTLNX_RHEL_MAJ_PREREQ(7,1)
+	vboxbo->bo.bdev->dev_mapping = dev->dev_mapping;
+#endif
+
+	vbox_ttm_placement(vboxbo, VBOX_MEM_TYPE_VRAM | VBOX_MEM_TYPE_SYSTEM);
+
+#if RTLNX_VER_MAX(5,13,0) && !RTLNX_RHEL_RANGE(8,6, 8,99)
+	acc_size = ttm_bo_dma_acc_size(&vbox->ttm.bdev, size,
+				       sizeof(struct vbox_bo));
+#endif
+
+#if RTLNX_VER_MIN(5,14,0) || RTLNX_RHEL_RANGE(8,6, 8,99)
+	/* Initialization of the following was removed from DRM stack
+	 * in 5.14, so we need to do it manually. */
+	vboxbo->bo.base.funcs = &vbox_drm_gem_object_funcs;
+	kref_init(&vboxbo->bo.base.refcount);
+	vboxbo->bo.base.size = size;
+	vboxbo->bo.base.dev = dev;
+	dma_resv_init(&vboxbo->bo.base._resv);
+	drm_vma_node_reset(&vboxbo->bo.base.vma_node);
+#endif
+
+#if RTLNX_VER_MIN(6,1,0) || RTLNX_RHEL_RANGE(8,9, 8,99) || RTLNX_RHEL_RANGE(9,3, 9,99) || RTLNX_SUSE_MAJ_PREREQ(15,5)
+	ret = ttm_bo_init_validate(&vbox->ttm.bdev, &vboxbo->bo,
+#else
+	ret = ttm_bo_init(&vbox->ttm.bdev, &vboxbo->bo, size,
+#endif /* < 6.1.0 */
+			  ttm_bo_type_device, &vboxbo->placement,
+#if RTLNX_VER_MAX(4,17,0) && !RTLNX_RHEL_MAJ_PREREQ(7,6) && !RTLNX_SUSE_MAJ_PREREQ(15,1) && !RTLNX_SUSE_MAJ_PREREQ(12,5)
+			  align >> PAGE_SHIFT, false, NULL, acc_size,
+#elif RTLNX_VER_MAX(5,13,0) && !RTLNX_RHEL_RANGE(8,6, 8,99) /* < 5.13.0, < RHEL(8.6, 8.99) */
+			  align >> PAGE_SHIFT, false, acc_size,
+#else /* > 5.13.0 */
+			  align >> PAGE_SHIFT, false,
+#endif /* > 5.13.0 */
+#if RTLNX_VER_MIN(3,18,0) || RTLNX_RHEL_MAJ_PREREQ(7,2)
+			  NULL, NULL, vbox_bo_ttm_destroy);
+#else
+			  NULL, vbox_bo_ttm_destroy);
+#endif
+	if (ret)
+	{
+		/* In case of failure, ttm_bo_init() supposed to call
+		 * vbox_bo_ttm_destroy() which in turn will free @vboxbo. */
+		goto err_exit;
+	}
+
+	*pvboxbo = vboxbo;
+
+	return 0;
+
+err_free_vboxbo:
+	kfree(vboxbo);
+err_exit:
+	return ret;
+}
+
+static inline u64 vbox_bo_gpu_offset(struct vbox_bo *bo)
+{
+#if RTLNX_VER_MIN(5,14,0) || RTLNX_RHEL_RANGE(8,6, 8,99)
+	return bo->bo.resource->start << PAGE_SHIFT;
+#elif RTLNX_VER_MIN(5,9,0) || RTLNX_RHEL_MIN(8,4) || RTLNX_SUSE_MAJ_PREREQ(15,3)
+	return bo->bo.mem.start << PAGE_SHIFT;
+#else
+	return bo->bo.offset;
+#endif
+}
+
+int vbox_bo_pin(struct vbox_bo *bo, u32 mem_type, u64 *gpu_addr)
+{
+#if RTLNX_VER_MIN(4,16,0) || RTLNX_RHEL_MAJ_PREREQ(7,6) || RTLNX_SUSE_MAJ_PREREQ(15,1) || RTLNX_SUSE_MAJ_PREREQ(12,5)
+	struct ttm_operation_ctx ctx = { false, false };
+#endif
+	int ret;
+#if RTLNX_VER_MAX(5,11,0) && !RTLNX_RHEL_MAJ_PREREQ(8,5)
+	int i;
+#endif
+
+	if (bo->pin_count) {
+		bo->pin_count++;
+		if (gpu_addr)
+			*gpu_addr = vbox_bo_gpu_offset(bo);
+
+		return 0;
+	}
+
+	vbox_ttm_placement(bo, mem_type);
+
+#if RTLNX_VER_MAX(5,11,0) && !RTLNX_RHEL_MAJ_PREREQ(8,5)
+	for (i = 0; i < bo->placement.num_placement; i++)
+		PLACEMENT_FLAGS(bo->placements[i]) |= TTM_PL_FLAG_NO_EVICT;
+#endif
+
+#if RTLNX_VER_MAX(4,16,0) && !RTLNX_RHEL_MAJ_PREREQ(7,6) && !RTLNX_SUSE_MAJ_PREREQ(15,1) && !RTLNX_SUSE_MAJ_PREREQ(12,5)
+	ret = ttm_bo_validate(&bo->bo, &bo->placement, false, false);
+#else
+	ret = ttm_bo_validate(&bo->bo, &bo->placement, &ctx);
+#endif
+	if (ret)
+		return ret;
+
+	bo->pin_count = 1;
+
+#if RTLNX_VER_MIN(5,11,0) || RTLNX_RHEL_RANGE(8,5, 8,99)
+	ttm_bo_pin(&bo->bo);
+#endif
+
+	if (gpu_addr)
+		*gpu_addr = vbox_bo_gpu_offset(bo);
+
+	return 0;
+}
+
+int vbox_bo_unpin(struct vbox_bo *bo)
+{
+#if RTLNX_VER_MIN(4,16,0) || RTLNX_RHEL_MAJ_PREREQ(7,6) || RTLNX_SUSE_MAJ_PREREQ(15,1) || RTLNX_SUSE_MAJ_PREREQ(12,5)
+# if RTLNX_VER_MAX(5,11,0) && !RTLNX_RHEL_MAJ_PREREQ(8,5)
+	struct ttm_operation_ctx ctx = { false, false };
+# endif
+#endif
+	int ret = 0;
+#if RTLNX_VER_MAX(5,11,0) && !RTLNX_RHEL_MAJ_PREREQ(8,5)
+	int i;
+#endif
+
+	if (!bo->pin_count) {
+		DRM_ERROR("unpin bad %p\n", bo);
+		return 0;
+	}
+	bo->pin_count--;
+	if (bo->pin_count)
+		return 0;
+
+#if RTLNX_VER_MAX(5,11,0) && !RTLNX_RHEL_MAJ_PREREQ(8,5)
+	for (i = 0; i < bo->placement.num_placement; i++)
+		PLACEMENT_FLAGS(bo->placements[i]) &= ~TTM_PL_FLAG_NO_EVICT;
+#endif
+
+#if RTLNX_VER_MAX(4,16,0) && !RTLNX_RHEL_MAJ_PREREQ(7,6) && !RTLNX_SUSE_MAJ_PREREQ(15,1) && !RTLNX_SUSE_MAJ_PREREQ(12,5)
+	ret = ttm_bo_validate(&bo->bo, &bo->placement, false, false);
+#elif RTLNX_VER_MAX(5,11,0) && !RTLNX_RHEL_MAJ_PREREQ(8,5)
+	ret = ttm_bo_validate(&bo->bo, &bo->placement, &ctx);
+#endif
+	if (ret)
+		return ret;
+
+#if RTLNX_VER_MIN(5,11,0) || RTLNX_RHEL_RANGE(8,5, 8,99)
+	ttm_bo_unpin(&bo->bo);
+#endif
+
+	return 0;
+}
+
+#if RTLNX_VER_MAX(5,11,0) && !RTLNX_RHEL_MAJ_PREREQ(8,5)
+/*
+ * Move a vbox-owned buffer object to system memory if no one else has it
+ * pinned.  The caller must have pinned it previously, and this call will
+ * release the caller's pin.
+ */
+int vbox_bo_push_sysram(struct vbox_bo *bo)
+{
+# if RTLNX_VER_MIN(4,16,0) || RTLNX_RHEL_MAJ_PREREQ(7,6) || RTLNX_SUSE_MAJ_PREREQ(15,1) || RTLNX_SUSE_MAJ_PREREQ(12,5)
+	struct ttm_operation_ctx ctx = { false, false };
+# endif
+	int i, ret;
+
+	if (!bo->pin_count) {
+		DRM_ERROR("unpin bad %p\n", bo);
+		return 0;
+	}
+	bo->pin_count--;
+	if (bo->pin_count)
+		return 0;
+
+	if (bo->kmap.virtual)
+		ttm_bo_kunmap(&bo->kmap);
+
+	vbox_ttm_placement(bo, VBOX_MEM_TYPE_SYSTEM);
+
+	for (i = 0; i < bo->placement.num_placement; i++)
+		PLACEMENT_FLAGS(bo->placements[i]) |= TTM_PL_FLAG_NO_EVICT;
+
+# if RTLNX_VER_MAX(4,16,0) && !RTLNX_RHEL_MAJ_PREREQ(7,6) && !RTLNX_SUSE_MAJ_PREREQ(15,1) && !RTLNX_SUSE_MAJ_PREREQ(12,5)
+	ret = ttm_bo_validate(&bo->bo, &bo->placement, false, false);
+# else
+	ret = ttm_bo_validate(&bo->bo, &bo->placement, &ctx);
+# endif
+	if (ret) {
+		DRM_ERROR("pushing to VRAM failed\n");
+		return ret;
+	}
+
+	return 0;
+}
+#endif
+
+int vbox_mmap(struct file *filp, struct vm_area_struct *vma)
+{
+	struct drm_file *file_priv;
+	struct vbox_private *vbox;
+	int ret = -EINVAL;
+
+	if (unlikely(vma->vm_pgoff < DRM_FILE_PAGE_OFFSET))
+		return -EINVAL;
+
+	file_priv = filp->private_data;
+	vbox = file_priv->minor->dev->dev_private;
+
+#if RTLNX_VER_MIN(5,14,0) || RTLNX_RHEL_RANGE(8,6, 8,99)
+	(void)vbox;
+	if (drm_dev_is_unplugged(file_priv->minor->dev))
+		return -ENODEV;
+	ret = drm_gem_mmap(filp, vma);
+#else
+	ret = ttm_bo_mmap(filp, vma, &vbox->ttm.bdev);
+#endif
+	return ret;
+}