drivers/gpu/drm/cirrus/cirrus_ttm.c - maze/linux - Git at Google

 /*
  * 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>
  */
 #include <drm/drmP.h>
 #include "cirrus_drv.h"
 #include <ttm/ttm_page_alloc.h>

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

 static int
 cirrus_ttm_mem_global_init(struct drm_global_reference *ref)
 {
 	return ttm_mem_global_init(ref->object);
 }

 static void
 cirrus_ttm_mem_global_release(struct drm_global_reference *ref)
 {
 	ttm_mem_global_release(ref->object);
 }

 static int cirrus_ttm_global_init(struct cirrus_device *cirrus)
 {
 	struct drm_global_reference *global_ref;
 	int r;

 	global_ref = &cirrus->ttm.mem_global_ref;
 	global_ref->global_type = DRM_GLOBAL_TTM_MEM;
 	global_ref->size = sizeof(struct ttm_mem_global);
 	global_ref->init = &cirrus_ttm_mem_global_init;
 	global_ref->release = &cirrus_ttm_mem_global_release;
 	r = drm_global_item_ref(global_ref);
 	if (r != 0) {
 		DRM_ERROR("Failed setting up TTM memory accounting "
 			  "subsystem.\n");
 		return r;
 	}

 	cirrus->ttm.bo_global_ref.mem_glob =
 		cirrus->ttm.mem_global_ref.object;
 	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_init;
 	global_ref->release = &ttm_bo_global_release;
 	r = drm_global_item_ref(global_ref);
 	if (r != 0) {
 		DRM_ERROR("Failed setting up TTM BO subsystem.\n");
 		drm_global_item_unref(&cirrus->ttm.mem_global_ref);
 		return r;
 	}
 	return 0;
 }

 void
 cirrus_ttm_global_release(struct cirrus_device *cirrus)
 {
 	if (cirrus->ttm.mem_global_ref.release == NULL)
 		return;

 	drm_global_item_unref(&cirrus->ttm.bo_global_ref.ref);
 	drm_global_item_unref(&cirrus->ttm.mem_global_ref);
 	cirrus->ttm.mem_global_ref.release = NULL;
 }


 static void cirrus_bo_ttm_destroy(struct ttm_buffer_object *tbo)
 {
 	struct cirrus_bo *bo;

 	bo = container_of(tbo, struct cirrus_bo, bo);

 	drm_gem_object_release(&bo->gem);
 	kfree(bo);
 }

 bool cirrus_ttm_bo_is_cirrus_bo(struct ttm_buffer_object *bo)
 {
 	if (bo->destroy == &cirrus_bo_ttm_destroy)
 		return true;
 	return false;
 }

 static int
 cirrus_bo_init_mem_type(struct ttm_bo_device *bdev, uint32_t 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)type);
 		return -EINVAL;
 	}
 	return 0;
 }

 static void
 cirrus_bo_evict_flags(struct ttm_buffer_object *bo, struct ttm_placement *pl)
 {
 	struct cirrus_bo *cirrusbo = cirrus_bo(bo);

 	if (!cirrus_ttm_bo_is_cirrus_bo(bo))
 		return;

 	cirrus_ttm_placement(cirrusbo, TTM_PL_FLAG_SYSTEM);
 	*pl = cirrusbo->placement;
 }

 static int cirrus_bo_verify_access(struct ttm_buffer_object *bo, struct file *filp)
 {
 	struct cirrus_bo *cirrusbo = cirrus_bo(bo);

 	return drm_vma_node_verify_access(&cirrusbo->gem.vma_node, filp);
 }

 static int cirrus_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 cirrus_device *cirrus = cirrus_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(cirrus->dev->pdev, 0);
 		mem->bus.is_iomem = true;
 		break;
 	default:
 		return -EINVAL;
 		break;
 	}
 	return 0;
 }

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

 static int cirrus_bo_move(struct ttm_buffer_object *bo,
 		       bool evict, bool interruptible,
 		       bool no_wait_gpu,
 		       struct ttm_mem_reg *new_mem)
 {
 	int r;
 	r = ttm_bo_move_memcpy(bo, evict, no_wait_gpu, new_mem);
 	return r;
 }


 static void cirrus_ttm_backend_destroy(struct ttm_tt *tt)
 {
 	ttm_tt_fini(tt);
 	kfree(tt);
 }

 static struct ttm_backend_func cirrus_tt_backend_func = {
 	.destroy = &cirrus_ttm_backend_destroy,
 };


 struct ttm_tt *cirrus_ttm_tt_create(struct ttm_bo_device *bdev,
 				 unsigned long size, uint32_t page_flags,
 				 struct page *dummy_read_page)
 {
 	struct ttm_tt *tt;

 	tt = kzalloc(sizeof(struct ttm_tt), GFP_KERNEL);
 	if (tt == NULL)
 		return NULL;
 	tt->func = &cirrus_tt_backend_func;
 	if (ttm_tt_init(tt, bdev, size, page_flags, dummy_read_page)) {
 		kfree(tt);
 		return NULL;
 	}
 	return tt;
 }

 static int cirrus_ttm_tt_populate(struct ttm_tt *ttm)
 {
 	return ttm_pool_populate(ttm);
 }

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

 struct ttm_bo_driver cirrus_bo_driver = {
 	.ttm_tt_create = cirrus_ttm_tt_create,
 	.ttm_tt_populate = cirrus_ttm_tt_populate,
 	.ttm_tt_unpopulate = cirrus_ttm_tt_unpopulate,
 	.init_mem_type = cirrus_bo_init_mem_type,
 	.evict_flags = cirrus_bo_evict_flags,
 	.move = cirrus_bo_move,
 	.verify_access = cirrus_bo_verify_access,
 	.io_mem_reserve = &cirrus_ttm_io_mem_reserve,
 	.io_mem_free = &cirrus_ttm_io_mem_free,
 };

 int cirrus_mm_init(struct cirrus_device *cirrus)
 {
 	int ret;
 	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, DRM_FILE_PAGE_OFFSET,
 				 true);
 	if (ret) {
 		DRM_ERROR("Error initialising bo driver; %d\n", ret);
 		return ret;
 	}

 	ret = ttm_bo_init_mm(bdev, TTM_PL_VRAM,
 			     cirrus->mc.vram_size >> PAGE_SHIFT);
 	if (ret) {
 		DRM_ERROR("Failed ttm VRAM init: %d\n", ret);
 		return ret;
 	}

 	cirrus->fb_mtrr = arch_phys_wc_add(pci_resource_start(dev->pdev, 0),
 					   pci_resource_len(dev->pdev, 0));

 	cirrus->mm_inited = true;
 	return 0;
 }

 void cirrus_mm_fini(struct cirrus_device *cirrus)
 {
 	if (!cirrus->mm_inited)
 		return;

 	ttm_bo_device_release(&cirrus->ttm.bdev);

 	cirrus_ttm_global_release(cirrus);

 	arch_phys_wc_del(cirrus->fb_mtrr);
 	cirrus->fb_mtrr = 0;
 }

 void cirrus_ttm_placement(struct cirrus_bo *bo, int domain)
 {
 	u32 c = 0;
 	bo->placement.fpfn = 0;
 	bo->placement.lpfn = 0;
 	bo->placement.placement = bo->placements;
 	bo->placement.busy_placement = bo->placements;
 	if (domain & TTM_PL_FLAG_VRAM)
 		bo->placements[c++] = TTM_PL_FLAG_WC | TTM_PL_FLAG_UNCACHED | TTM_PL_FLAG_VRAM;
 	if (domain & TTM_PL_FLAG_SYSTEM)
 		bo->placements[c++] = TTM_PL_MASK_CACHING | TTM_PL_FLAG_SYSTEM;
 	if (!c)
 		bo->placements[c++] = TTM_PL_MASK_CACHING | TTM_PL_FLAG_SYSTEM;
 	bo->placement.num_placement = c;
 	bo->placement.num_busy_placement = c;
 }

 int cirrus_bo_create(struct drm_device *dev, int size, int align,
 		  uint32_t flags, struct cirrus_bo **pcirrusbo)
 {
 	struct cirrus_device *cirrus = dev->dev_private;
 	struct cirrus_bo *cirrusbo;
 	size_t acc_size;
 	int ret;

 	cirrusbo = kzalloc(sizeof(struct cirrus_bo), GFP_KERNEL);
 	if (!cirrusbo)
 		return -ENOMEM;

 	ret = drm_gem_object_init(dev, &cirrusbo->gem, size);
 	if (ret) {
 		kfree(cirrusbo);
 		return ret;
 	}

 	cirrusbo->bo.bdev = &cirrus->ttm.bdev;
 	cirrusbo->bo.bdev->dev_mapping = dev->dev_mapping;

 	cirrus_ttm_placement(cirrusbo, TTM_PL_FLAG_VRAM | TTM_PL_FLAG_SYSTEM);

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

 	ret = ttm_bo_init(&cirrus->ttm.bdev, &cirrusbo->bo, size,
 			  ttm_bo_type_device, &cirrusbo->placement,
 			  align >> PAGE_SHIFT, false, NULL, acc_size,
 			  NULL, cirrus_bo_ttm_destroy);
 	if (ret)
 		return ret;

 	*pcirrusbo = cirrusbo;
 	return 0;
 }

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

 int cirrus_bo_pin(struct cirrus_bo *bo, u32 pl_flag, u64 *gpu_addr)
 {
 	int i, ret;

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

 	cirrus_ttm_placement(bo, pl_flag);
 	for (i = 0; i < bo->placement.num_placement; i++)
 		bo->placements[i] |= TTM_PL_FLAG_NO_EVICT;
 	ret = ttm_bo_validate(&bo->bo, &bo->placement, false, false);
 	if (ret)
 		return ret;

 	bo->pin_count = 1;
 	if (gpu_addr)
 		*gpu_addr = cirrus_bo_gpu_offset(bo);
 	return 0;
 }

 int cirrus_bo_unpin(struct cirrus_bo *bo)
 {
 	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] &= ~TTM_PL_FLAG_NO_EVICT;
 	ret = ttm_bo_validate(&bo->bo, &bo->placement, false, false);
 	if (ret)
 		return ret;

 	return 0;
 }

 int cirrus_bo_push_sysram(struct cirrus_bo *bo)
 {
 	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);

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

 	ret = ttm_bo_validate(&bo->bo, &bo->placement, false, false);
 	if (ret) {
 		DRM_ERROR("pushing to VRAM failed\n");
 		return ret;
 	}
 	return 0;
 }

 int cirrus_mmap(struct file *filp, struct vm_area_struct *vma)
 {
 	struct drm_file *file_priv;
 	struct cirrus_device *cirrus;

 	if (unlikely(vma->vm_pgoff < DRM_FILE_PAGE_OFFSET))
 		return drm_mmap(filp, vma);

 	file_priv = filp->private_data;
 	cirrus = file_priv->minor->dev->dev_private;
 	return ttm_bo_mmap(filp, vma, &cirrus->ttm.bdev);
 }
	/*
	* 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>
	*/
	#include <drm/drmP.h>
	#include "cirrus_drv.h"
	#include <ttm/ttm_page_alloc.h>

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

	static int
	cirrus_ttm_mem_global_init(struct drm_global_reference *ref)
	{
	return ttm_mem_global_init(ref->object);
	}

	static void
	cirrus_ttm_mem_global_release(struct drm_global_reference *ref)
	{
	ttm_mem_global_release(ref->object);
	}

	static int cirrus_ttm_global_init(struct cirrus_device *cirrus)
	{
	struct drm_global_reference *global_ref;
	int r;

	global_ref = &cirrus->ttm.mem_global_ref;
	global_ref->global_type = DRM_GLOBAL_TTM_MEM;
	global_ref->size = sizeof(struct ttm_mem_global);
	global_ref->init = &cirrus_ttm_mem_global_init;
	global_ref->release = &cirrus_ttm_mem_global_release;
	r = drm_global_item_ref(global_ref);
	if (r != 0) {
	DRM_ERROR("Failed setting up TTM memory accounting "
	"subsystem.\n");
	return r;
	}

	cirrus->ttm.bo_global_ref.mem_glob =
	cirrus->ttm.mem_global_ref.object;
	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_init;
	global_ref->release = &ttm_bo_global_release;
	r = drm_global_item_ref(global_ref);
	if (r != 0) {
	DRM_ERROR("Failed setting up TTM BO subsystem.\n");
	drm_global_item_unref(&cirrus->ttm.mem_global_ref);
	return r;
	}
	return 0;
	}

	void
	cirrus_ttm_global_release(struct cirrus_device *cirrus)
	{
	if (cirrus->ttm.mem_global_ref.release == NULL)
	return;

	drm_global_item_unref(&cirrus->ttm.bo_global_ref.ref);
	drm_global_item_unref(&cirrus->ttm.mem_global_ref);
	cirrus->ttm.mem_global_ref.release = NULL;
	}


	static void cirrus_bo_ttm_destroy(struct ttm_buffer_object *tbo)
	{
	struct cirrus_bo *bo;

	bo = container_of(tbo, struct cirrus_bo, bo);

	drm_gem_object_release(&bo->gem);
	kfree(bo);
	}

	bool cirrus_ttm_bo_is_cirrus_bo(struct ttm_buffer_object *bo)
	{
	if (bo->destroy == &cirrus_bo_ttm_destroy)
	return true;
	return false;
	}

	static int
	cirrus_bo_init_mem_type(struct ttm_bo_device *bdev, uint32_t 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)type);
	return -EINVAL;
	}
	return 0;
	}

	static void
	cirrus_bo_evict_flags(struct ttm_buffer_object bo, struct ttm_placement pl)
	{
	struct cirrus_bo *cirrusbo = cirrus_bo(bo);

	if (!cirrus_ttm_bo_is_cirrus_bo(bo))
	return;

	cirrus_ttm_placement(cirrusbo, TTM_PL_FLAG_SYSTEM);
	*pl = cirrusbo->placement;
	}

	static int cirrus_bo_verify_access(struct ttm_buffer_object bo, struct file filp)
	{
	struct cirrus_bo *cirrusbo = cirrus_bo(bo);

	return drm_vma_node_verify_access(&cirrusbo->gem.vma_node, filp);
	}

	static int cirrus_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 cirrus_device *cirrus = cirrus_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(cirrus->dev->pdev, 0);
	mem->bus.is_iomem = true;
	break;
	default:
	return -EINVAL;
	break;
	}
	return 0;
	}

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

	static int cirrus_bo_move(struct ttm_buffer_object *bo,
	bool evict, bool interruptible,
	bool no_wait_gpu,
	struct ttm_mem_reg *new_mem)
	{
	int r;
	r = ttm_bo_move_memcpy(bo, evict, no_wait_gpu, new_mem);
	return r;
	}


	static void cirrus_ttm_backend_destroy(struct ttm_tt *tt)
	{
	ttm_tt_fini(tt);
	kfree(tt);
	}

	static struct ttm_backend_func cirrus_tt_backend_func = {
	.destroy = &cirrus_ttm_backend_destroy,
	};


	struct ttm_tt cirrus_ttm_tt_create(struct ttm_bo_device bdev,
	unsigned long size, uint32_t page_flags,
	struct page *dummy_read_page)
	{
	struct ttm_tt *tt;

	tt = kzalloc(sizeof(struct ttm_tt), GFP_KERNEL);
	if (tt == NULL)
	return NULL;
	tt->func = &cirrus_tt_backend_func;
	if (ttm_tt_init(tt, bdev, size, page_flags, dummy_read_page)) {
	kfree(tt);
	return NULL;
	}
	return tt;
	}

	static int cirrus_ttm_tt_populate(struct ttm_tt *ttm)
	{
	return ttm_pool_populate(ttm);
	}

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

	struct ttm_bo_driver cirrus_bo_driver = {
	.ttm_tt_create = cirrus_ttm_tt_create,
	.ttm_tt_populate = cirrus_ttm_tt_populate,
	.ttm_tt_unpopulate = cirrus_ttm_tt_unpopulate,
	.init_mem_type = cirrus_bo_init_mem_type,
	.evict_flags = cirrus_bo_evict_flags,
	.move = cirrus_bo_move,
	.verify_access = cirrus_bo_verify_access,
	.io_mem_reserve = &cirrus_ttm_io_mem_reserve,
	.io_mem_free = &cirrus_ttm_io_mem_free,
	};

	int cirrus_mm_init(struct cirrus_device *cirrus)
	{
	int ret;
	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, DRM_FILE_PAGE_OFFSET,
	true);
	if (ret) {
	DRM_ERROR("Error initialising bo driver; %d\n", ret);
	return ret;
	}

	ret = ttm_bo_init_mm(bdev, TTM_PL_VRAM,
	cirrus->mc.vram_size >> PAGE_SHIFT);
	if (ret) {
	DRM_ERROR("Failed ttm VRAM init: %d\n", ret);
	return ret;
	}

	cirrus->fb_mtrr = arch_phys_wc_add(pci_resource_start(dev->pdev, 0),
	pci_resource_len(dev->pdev, 0));

	cirrus->mm_inited = true;
	return 0;
	}

	void cirrus_mm_fini(struct cirrus_device *cirrus)
	{
	if (!cirrus->mm_inited)
	return;

	ttm_bo_device_release(&cirrus->ttm.bdev);

	cirrus_ttm_global_release(cirrus);

	arch_phys_wc_del(cirrus->fb_mtrr);
	cirrus->fb_mtrr = 0;
	}

	void cirrus_ttm_placement(struct cirrus_bo *bo, int domain)
	{
	u32 c = 0;
	bo->placement.fpfn = 0;
	bo->placement.lpfn = 0;
	bo->placement.placement = bo->placements;
	bo->placement.busy_placement = bo->placements;
	if (domain & TTM_PL_FLAG_VRAM)
	bo->placements[c++] = TTM_PL_FLAG_WC \| TTM_PL_FLAG_UNCACHED \| TTM_PL_FLAG_VRAM;
	if (domain & TTM_PL_FLAG_SYSTEM)
	bo->placements[c++] = TTM_PL_MASK_CACHING \| TTM_PL_FLAG_SYSTEM;
	if (!c)
	bo->placements[c++] = TTM_PL_MASK_CACHING \| TTM_PL_FLAG_SYSTEM;
	bo->placement.num_placement = c;
	bo->placement.num_busy_placement = c;
	}

	int cirrus_bo_create(struct drm_device *dev, int size, int align,
	uint32_t flags, struct cirrus_bo **pcirrusbo)
	{
	struct cirrus_device *cirrus = dev->dev_private;
	struct cirrus_bo *cirrusbo;
	size_t acc_size;
	int ret;

	cirrusbo = kzalloc(sizeof(struct cirrus_bo), GFP_KERNEL);
	if (!cirrusbo)
	return -ENOMEM;

	ret = drm_gem_object_init(dev, &cirrusbo->gem, size);
	if (ret) {
	kfree(cirrusbo);
	return ret;
	}

	cirrusbo->bo.bdev = &cirrus->ttm.bdev;
	cirrusbo->bo.bdev->dev_mapping = dev->dev_mapping;

	cirrus_ttm_placement(cirrusbo, TTM_PL_FLAG_VRAM \| TTM_PL_FLAG_SYSTEM);

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

	ret = ttm_bo_init(&cirrus->ttm.bdev, &cirrusbo->bo, size,
	ttm_bo_type_device, &cirrusbo->placement,
	align >> PAGE_SHIFT, false, NULL, acc_size,
	NULL, cirrus_bo_ttm_destroy);
	if (ret)
	return ret;

	*pcirrusbo = cirrusbo;
	return 0;
	}

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

	int cirrus_bo_pin(struct cirrus_bo bo, u32 pl_flag, u64 gpu_addr)
	{
	int i, ret;

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

	cirrus_ttm_placement(bo, pl_flag);
	for (i = 0; i < bo->placement.num_placement; i++)
	bo->placements[i] \|= TTM_PL_FLAG_NO_EVICT;
	ret = ttm_bo_validate(&bo->bo, &bo->placement, false, false);
	if (ret)
	return ret;

	bo->pin_count = 1;
	if (gpu_addr)
	*gpu_addr = cirrus_bo_gpu_offset(bo);
	return 0;
	}

	int cirrus_bo_unpin(struct cirrus_bo *bo)
	{
	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] &= ~TTM_PL_FLAG_NO_EVICT;
	ret = ttm_bo_validate(&bo->bo, &bo->placement, false, false);
	if (ret)
	return ret;

	return 0;
	}

	int cirrus_bo_push_sysram(struct cirrus_bo *bo)
	{
	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);

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

	ret = ttm_bo_validate(&bo->bo, &bo->placement, false, false);
	if (ret) {
	DRM_ERROR("pushing to VRAM failed\n");
	return ret;
	}
	return 0;
	}

	int cirrus_mmap(struct file filp, struct vm_area_struct vma)
	{
	struct drm_file *file_priv;
	struct cirrus_device *cirrus;

	if (unlikely(vma->vm_pgoff < DRM_FILE_PAGE_OFFSET))
	return drm_mmap(filp, vma);

	file_priv = filp->private_data;
	cirrus = file_priv->minor->dev->dev_private;
	return ttm_bo_mmap(filp, vma, &cirrus->ttm.bdev);
	}