drivers/staging/vboxvideo/vbox_ttm.c - third_party/dump-capture-kernel - Git at Google

 /*
  * Copyright (C) 2013-2017 Oracle Corporation
  * 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"
 #include <ttm/ttm_page_alloc.h>

 static inline struct vbox_private *vbox_bdev(struct ttm_bo_device *bd)
 {
 	return container_of(bd, struct vbox_private, ttm.bdev);
 }

 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;

 	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;
 	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");
 		drm_global_item_unref(&vbox->ttm.mem_global_ref);
 		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);
 }

 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;
 }

 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;
 }

 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, TTM_PL_FLAG_SYSTEM);
 	*pl = vboxbo->placement;
 }

 static int vbox_bo_verify_access(struct ttm_buffer_object *bo,
 				 struct file *filp)
 {
 	return 0;
 }

 static int vbox_ttm_io_mem_reserve(struct ttm_bo_device *bdev,
 				   struct ttm_mem_reg *mem)
 {
 	struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
 	struct vbox_private *vbox = vbox_bdev(bdev);

 	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;
 }

 static void vbox_ttm_io_mem_free(struct ttm_bo_device *bdev,
 				 struct ttm_mem_reg *mem)
 {
 }

 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,
 };

 static struct ttm_tt *vbox_ttm_tt_create(struct ttm_buffer_object *bo,
 					 u32 page_flags)
 {
 	struct ttm_tt *tt;

 	tt = kzalloc(sizeof(*tt), GFP_KERNEL);
 	if (!tt)
 		return NULL;

 	tt->func = &vbox_tt_backend_func;
 	if (ttm_tt_init(tt, bo, page_flags)) {
 		kfree(tt);
 		return NULL;
 	}

 	return tt;
 }

 static int vbox_ttm_tt_populate(struct ttm_tt *ttm,
 				struct ttm_operation_ctx *ctx)
 {
 	return ttm_pool_populate(ttm, ctx);
 }

 static void vbox_ttm_tt_unpopulate(struct ttm_tt *ttm)
 {
 	ttm_pool_unpopulate(ttm);
 }

 static struct ttm_bo_driver vbox_bo_driver = {
 	.ttm_tt_create = vbox_ttm_tt_create,
 	.ttm_tt_populate = vbox_ttm_tt_populate,
 	.ttm_tt_unpopulate = vbox_ttm_tt_unpopulate,
 	.init_mem_type = vbox_bo_init_mem_type,
 	.eviction_valuable = ttm_bo_eviction_valuable,
 	.evict_flags = vbox_bo_evict_flags,
 	.verify_access = vbox_bo_verify_access,
 	.io_mem_reserve = &vbox_ttm_io_mem_reserve,
 	.io_mem_free = &vbox_ttm_io_mem_free,
 };

 int vbox_mm_init(struct vbox_private *vbox)
 {
 	int ret;
 	struct drm_device *dev = vbox->dev;
 	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);
 		goto err_ttm_global_release;
 	}

 	ret = ttm_bo_init_mm(bdev, TTM_PL_VRAM,
 			     vbox->available_vram_size >> PAGE_SHIFT);
 	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(dev->pdev, 0),
 				     pci_resource_len(dev->pdev, 0),
 				     DRM_MTRR_WC);
 #else
 	vbox->fb_mtrr = arch_phys_wc_add(pci_resource_start(dev->pdev, 0),
 					 pci_resource_len(dev->pdev, 0));
 #endif
 	return 0;

 err_device_release:
 	ttm_bo_device_release(&vbox->ttm.bdev);
 err_ttm_global_release:
 	vbox_ttm_global_release(vbox);
 	return ret;
 }

 void vbox_mm_fini(struct vbox_private *vbox)
 {
 #ifdef DRM_MTRR_WC
 	drm_mtrr_del(vbox->fb_mtrr,
 		     pci_resource_start(vbox->dev->pdev, 0),
 		     pci_resource_len(vbox->dev->pdev, 0), DRM_MTRR_WC);
 #else
 	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)
 {
 	unsigned int i;
 	u32 c = 0;

 	bo->placement.placement = bo->placements;
 	bo->placement.busy_placement = bo->placements;

 	if (domain & TTM_PL_FLAG_VRAM)
 		bo->placements[c++].flags =
 		    TTM_PL_FLAG_WC | TTM_PL_FLAG_UNCACHED | TTM_PL_FLAG_VRAM;
 	if (domain & TTM_PL_FLAG_SYSTEM)
 		bo->placements[c++].flags =
 		    TTM_PL_MASK_CACHING | TTM_PL_FLAG_SYSTEM;
 	if (!c)
 		bo->placements[c++].flags =
 		    TTM_PL_MASK_CACHING | TTM_PL_FLAG_SYSTEM;

 	bo->placement.num_placement = c;
 	bo->placement.num_busy_placement = c;

 	for (i = 0; i < c; ++i) {
 		bo->placements[i].fpfn = 0;
 		bo->placements[i].lpfn = 0;
 	}
 }

 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;
 	size_t acc_size;
 	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;

 	vboxbo->bo.bdev = &vbox->ttm.bdev;

 	vbox_ttm_placement(vboxbo, TTM_PL_FLAG_VRAM | TTM_PL_FLAG_SYSTEM);

 	acc_size = ttm_bo_dma_acc_size(&vbox->ttm.bdev, size,
 				       sizeof(struct vbox_bo));

 	ret = ttm_bo_init(&vbox->ttm.bdev, &vboxbo->bo, size,
 			  ttm_bo_type_device, &vboxbo->placement,
 			  align >> PAGE_SHIFT, false, acc_size,
 			  NULL, NULL, vbox_bo_ttm_destroy);
 	if (ret)
 		goto err_free_vboxbo;

 	*pvboxbo = vboxbo;

 	return 0;

 err_free_vboxbo:
 	kfree(vboxbo);
 	return ret;
 }

 static inline u64 vbox_bo_gpu_offset(struct vbox_bo *bo)
 {
 	return bo->bo.offset;
 }

 int vbox_bo_pin(struct vbox_bo *bo, u32 pl_flag, u64 *gpu_addr)
 {
 	struct ttm_operation_ctx ctx = { false, false };
 	int i, ret;

 	if (bo->pin_count) {
 		bo->pin_count++;
 		if (gpu_addr)
 			*gpu_addr = vbox_bo_gpu_offset(bo);

 		return 0;
 	}

 	vbox_ttm_placement(bo, pl_flag);

 	for (i = 0; i < bo->placement.num_placement; i++)
 		bo->placements[i].flags |= TTM_PL_FLAG_NO_EVICT;

 	ret = ttm_bo_validate(&bo->bo, &bo->placement, &ctx);
 	if (ret)
 		return ret;

 	bo->pin_count = 1;

 	if (gpu_addr)
 		*gpu_addr = vbox_bo_gpu_offset(bo);

 	return 0;
 }

 int vbox_bo_unpin(struct vbox_bo *bo)
 {
 	struct ttm_operation_ctx ctx = { false, false };
 	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;

 	for (i = 0; i < bo->placement.num_placement; i++)
 		bo->placements[i].flags &= ~TTM_PL_FLAG_NO_EVICT;

 	ret = ttm_bo_validate(&bo->bo, &bo->placement, &ctx);
 	if (ret)
 		return ret;

 	return 0;
 }

 /*
  * 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)
 {
 	struct ttm_operation_ctx ctx = { false, false };
 	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, TTM_PL_FLAG_SYSTEM);

 	for (i = 0; i < bo->placement.num_placement; i++)
 		bo->placements[i].flags |= TTM_PL_FLAG_NO_EVICT;

 	ret = ttm_bo_validate(&bo->bo, &bo->placement, &ctx);
 	if (ret) {
 		DRM_ERROR("pushing to VRAM failed\n");
 		return ret;
 	}

 	return 0;
 }

 int vbox_mmap(struct file *filp, struct vm_area_struct *vma)
 {
 	struct drm_file *file_priv;
 	struct vbox_private *vbox;

 	if (unlikely(vma->vm_pgoff < DRM_FILE_PAGE_OFFSET))
 		return -EINVAL;

 	file_priv = filp->private_data;
 	vbox = file_priv->minor->dev->dev_private;

 	return ttm_bo_mmap(filp, vma, &vbox->ttm.bdev);
 }
	/*
	* Copyright (C) 2013-2017 Oracle Corporation
	* 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"
	#include <ttm/ttm_page_alloc.h>

	static inline struct vbox_private vbox_bdev(struct ttm_bo_device bd)
	{
	return container_of(bd, struct vbox_private, ttm.bdev);
	}

	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;

	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;
	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");
	drm_global_item_unref(&vbox->ttm.mem_global_ref);
	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);
	}

	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;
	}

	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;
	}

	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, TTM_PL_FLAG_SYSTEM);
	*pl = vboxbo->placement;
	}

	static int vbox_bo_verify_access(struct ttm_buffer_object *bo,
	struct file *filp)
	{
	return 0;
	}

	static int vbox_ttm_io_mem_reserve(struct ttm_bo_device *bdev,
	struct ttm_mem_reg *mem)
	{
	struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
	struct vbox_private *vbox = vbox_bdev(bdev);

	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;
	}

	static void vbox_ttm_io_mem_free(struct ttm_bo_device *bdev,
	struct ttm_mem_reg *mem)
	{
	}

	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,
	};

	static struct ttm_tt vbox_ttm_tt_create(struct ttm_buffer_object bo,
	u32 page_flags)
	{
	struct ttm_tt *tt;

	tt = kzalloc(sizeof(*tt), GFP_KERNEL);
	if (!tt)
	return NULL;

	tt->func = &vbox_tt_backend_func;
	if (ttm_tt_init(tt, bo, page_flags)) {
	kfree(tt);
	return NULL;
	}

	return tt;
	}

	static int vbox_ttm_tt_populate(struct ttm_tt *ttm,
	struct ttm_operation_ctx *ctx)
	{
	return ttm_pool_populate(ttm, ctx);
	}

	static void vbox_ttm_tt_unpopulate(struct ttm_tt *ttm)
	{
	ttm_pool_unpopulate(ttm);
	}

	static struct ttm_bo_driver vbox_bo_driver = {
	.ttm_tt_create = vbox_ttm_tt_create,
	.ttm_tt_populate = vbox_ttm_tt_populate,
	.ttm_tt_unpopulate = vbox_ttm_tt_unpopulate,
	.init_mem_type = vbox_bo_init_mem_type,
	.eviction_valuable = ttm_bo_eviction_valuable,
	.evict_flags = vbox_bo_evict_flags,
	.verify_access = vbox_bo_verify_access,
	.io_mem_reserve = &vbox_ttm_io_mem_reserve,
	.io_mem_free = &vbox_ttm_io_mem_free,
	};

	int vbox_mm_init(struct vbox_private *vbox)
	{
	int ret;
	struct drm_device *dev = vbox->dev;
	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);
	goto err_ttm_global_release;
	}

	ret = ttm_bo_init_mm(bdev, TTM_PL_VRAM,
	vbox->available_vram_size >> PAGE_SHIFT);
	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(dev->pdev, 0),
	pci_resource_len(dev->pdev, 0),
	DRM_MTRR_WC);
	#else
	vbox->fb_mtrr = arch_phys_wc_add(pci_resource_start(dev->pdev, 0),
	pci_resource_len(dev->pdev, 0));
	#endif
	return 0;

	err_device_release:
	ttm_bo_device_release(&vbox->ttm.bdev);
	err_ttm_global_release:
	vbox_ttm_global_release(vbox);
	return ret;
	}

	void vbox_mm_fini(struct vbox_private *vbox)
	{
	#ifdef DRM_MTRR_WC
	drm_mtrr_del(vbox->fb_mtrr,
	pci_resource_start(vbox->dev->pdev, 0),
	pci_resource_len(vbox->dev->pdev, 0), DRM_MTRR_WC);
	#else
	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)
	{
	unsigned int i;
	u32 c = 0;

	bo->placement.placement = bo->placements;
	bo->placement.busy_placement = bo->placements;

	if (domain & TTM_PL_FLAG_VRAM)
	bo->placements[c++].flags =
	TTM_PL_FLAG_WC \| TTM_PL_FLAG_UNCACHED \| TTM_PL_FLAG_VRAM;
	if (domain & TTM_PL_FLAG_SYSTEM)
	bo->placements[c++].flags =
	TTM_PL_MASK_CACHING \| TTM_PL_FLAG_SYSTEM;
	if (!c)
	bo->placements[c++].flags =
	TTM_PL_MASK_CACHING \| TTM_PL_FLAG_SYSTEM;

	bo->placement.num_placement = c;
	bo->placement.num_busy_placement = c;

	for (i = 0; i < c; ++i) {
	bo->placements[i].fpfn = 0;
	bo->placements[i].lpfn = 0;
	}
	}

	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;
	size_t acc_size;
	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;

	vboxbo->bo.bdev = &vbox->ttm.bdev;

	vbox_ttm_placement(vboxbo, TTM_PL_FLAG_VRAM \| TTM_PL_FLAG_SYSTEM);

	acc_size = ttm_bo_dma_acc_size(&vbox->ttm.bdev, size,
	sizeof(struct vbox_bo));

	ret = ttm_bo_init(&vbox->ttm.bdev, &vboxbo->bo, size,
	ttm_bo_type_device, &vboxbo->placement,
	align >> PAGE_SHIFT, false, acc_size,
	NULL, NULL, vbox_bo_ttm_destroy);
	if (ret)
	goto err_free_vboxbo;

	*pvboxbo = vboxbo;

	return 0;

	err_free_vboxbo:
	kfree(vboxbo);
	return ret;
	}

	static inline u64 vbox_bo_gpu_offset(struct vbox_bo *bo)
	{
	return bo->bo.offset;
	}

	int vbox_bo_pin(struct vbox_bo bo, u32 pl_flag, u64 gpu_addr)
	{
	struct ttm_operation_ctx ctx = { false, false };
	int i, ret;

	if (bo->pin_count) {
	bo->pin_count++;
	if (gpu_addr)
	*gpu_addr = vbox_bo_gpu_offset(bo);

	return 0;
	}

	vbox_ttm_placement(bo, pl_flag);

	for (i = 0; i < bo->placement.num_placement; i++)
	bo->placements[i].flags \|= TTM_PL_FLAG_NO_EVICT;

	ret = ttm_bo_validate(&bo->bo, &bo->placement, &ctx);
	if (ret)
	return ret;

	bo->pin_count = 1;

	if (gpu_addr)
	*gpu_addr = vbox_bo_gpu_offset(bo);

	return 0;
	}

	int vbox_bo_unpin(struct vbox_bo *bo)
	{
	struct ttm_operation_ctx ctx = { false, false };
	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;

	for (i = 0; i < bo->placement.num_placement; i++)
	bo->placements[i].flags &= ~TTM_PL_FLAG_NO_EVICT;

	ret = ttm_bo_validate(&bo->bo, &bo->placement, &ctx);
	if (ret)
	return ret;

	return 0;
	}

	/*
	* 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)
	{
	struct ttm_operation_ctx ctx = { false, false };
	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, TTM_PL_FLAG_SYSTEM);

	for (i = 0; i < bo->placement.num_placement; i++)
	bo->placements[i].flags \|= TTM_PL_FLAG_NO_EVICT;

	ret = ttm_bo_validate(&bo->bo, &bo->placement, &ctx);
	if (ret) {
	DRM_ERROR("pushing to VRAM failed\n");
	return ret;
	}

	return 0;
	}

	int vbox_mmap(struct file filp, struct vm_area_struct vma)
	{
	struct drm_file *file_priv;
	struct vbox_private *vbox;

	if (unlikely(vma->vm_pgoff < DRM_FILE_PAGE_OFFSET))
	return -EINVAL;

	file_priv = filp->private_data;
	vbox = file_priv->minor->dev->dev_private;

	return ttm_bo_mmap(filp, vma, &vbox->ttm.bdev);
	}