drivers/gpu/drm/nouveau/nouveau_ttm.c - kernel/quantenna - Git at Google

 /*
  * Copyright (c) 2007-2008 Tungsten Graphics, Inc., Cedar Park, TX., USA,
  * All Rights Reserved.
  * Copyright (c) 2009 VMware, Inc., Palo Alto, CA., USA,
  * All Rights Reserved.
  *
  * 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 above copyright notice and this permission notice (including the
  * next paragraph) shall be included in all copies or substantial portions
  * of the Software.
  *
  * 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.
  */

 #include "nouveau_drv.h"
 #include "nouveau_ttm.h"
 #include "nouveau_gem.h"

 #include "drm_legacy.h"

 #include <core/tegra.h>

 static int
 nouveau_vram_manager_init(struct ttm_mem_type_manager *man, unsigned long psize)
 {
 	struct nouveau_drm *drm = nouveau_bdev(man->bdev);
 	struct nvkm_fb *fb = nvxx_fb(&drm->device);
 	man->priv = fb;
 	return 0;
 }

 static int
 nouveau_vram_manager_fini(struct ttm_mem_type_manager *man)
 {
 	man->priv = NULL;
 	return 0;
 }

 static inline void
 nvkm_mem_node_cleanup(struct nvkm_mem *node)
 {
 	if (node->vma[0].node) {
 		nvkm_vm_unmap(&node->vma[0]);
 		nvkm_vm_put(&node->vma[0]);
 	}

 	if (node->vma[1].node) {
 		nvkm_vm_unmap(&node->vma[1]);
 		nvkm_vm_put(&node->vma[1]);
 	}
 }

 static void
 nouveau_vram_manager_del(struct ttm_mem_type_manager *man,
 			 struct ttm_mem_reg *mem)
 {
 	struct nouveau_drm *drm = nouveau_bdev(man->bdev);
 	struct nvkm_ram *ram = nvxx_fb(&drm->device)->ram;
 	nvkm_mem_node_cleanup(mem->mm_node);
 	ram->func->put(ram, (struct nvkm_mem **)&mem->mm_node);
 }

 static int
 nouveau_vram_manager_new(struct ttm_mem_type_manager *man,
 			 struct ttm_buffer_object *bo,
 			 const struct ttm_place *place,
 			 struct ttm_mem_reg *mem)
 {
 	struct nouveau_drm *drm = nouveau_bdev(man->bdev);
 	struct nvkm_ram *ram = nvxx_fb(&drm->device)->ram;
 	struct nouveau_bo *nvbo = nouveau_bo(bo);
 	struct nvkm_mem *node;
 	u32 size_nc = 0;
 	int ret;

 	if (drm->device.info.ram_size == 0)
 		return -ENOMEM;

 	if (nvbo->tile_flags & NOUVEAU_GEM_TILE_NONCONTIG)
 		size_nc = 1 << nvbo->page_shift;

 	ret = ram->func->get(ram, mem->num_pages << PAGE_SHIFT,
 			     mem->page_alignment << PAGE_SHIFT, size_nc,
 			     (nvbo->tile_flags >> 8) & 0x3ff, &node);
 	if (ret) {
 		mem->mm_node = NULL;
 		return (ret == -ENOSPC) ? 0 : ret;
 	}

 	node->page_shift = nvbo->page_shift;

 	mem->mm_node = node;
 	mem->start   = node->offset >> PAGE_SHIFT;
 	return 0;
 }

 const struct ttm_mem_type_manager_func nouveau_vram_manager = {
 	nouveau_vram_manager_init,
 	nouveau_vram_manager_fini,
 	nouveau_vram_manager_new,
 	nouveau_vram_manager_del,
 };

 static int
 nouveau_gart_manager_init(struct ttm_mem_type_manager *man, unsigned long psize)
 {
 	return 0;
 }

 static int
 nouveau_gart_manager_fini(struct ttm_mem_type_manager *man)
 {
 	return 0;
 }

 static void
 nouveau_gart_manager_del(struct ttm_mem_type_manager *man,
 			 struct ttm_mem_reg *mem)
 {
 	nvkm_mem_node_cleanup(mem->mm_node);
 	kfree(mem->mm_node);
 	mem->mm_node = NULL;
 }

 static int
 nouveau_gart_manager_new(struct ttm_mem_type_manager *man,
 			 struct ttm_buffer_object *bo,
 			 const struct ttm_place *place,
 			 struct ttm_mem_reg *mem)
 {
 	struct nouveau_drm *drm = nouveau_bdev(bo->bdev);
 	struct nouveau_bo *nvbo = nouveau_bo(bo);
 	struct nvkm_mem *node;

 	node = kzalloc(sizeof(*node), GFP_KERNEL);
 	if (!node)
 		return -ENOMEM;

 	node->page_shift = 12;

 	switch (drm->device.info.family) {
 	case NV_DEVICE_INFO_V0_TNT:
 	case NV_DEVICE_INFO_V0_CELSIUS:
 	case NV_DEVICE_INFO_V0_KELVIN:
 	case NV_DEVICE_INFO_V0_RANKINE:
 	case NV_DEVICE_INFO_V0_CURIE:
 		break;
 	case NV_DEVICE_INFO_V0_TESLA:
 		if (drm->device.info.chipset != 0x50)
 			node->memtype = (nvbo->tile_flags & 0x7f00) >> 8;
 		break;
 	case NV_DEVICE_INFO_V0_FERMI:
 	case NV_DEVICE_INFO_V0_KEPLER:
 	case NV_DEVICE_INFO_V0_MAXWELL:
 		node->memtype = (nvbo->tile_flags & 0xff00) >> 8;
 		break;
 	default:
 		NV_WARN(drm, "%s: unhandled family type %x\n", __func__,
 			drm->device.info.family);
 		break;
 	}

 	mem->mm_node = node;
 	mem->start   = 0;
 	return 0;
 }

 static void
 nouveau_gart_manager_debug(struct ttm_mem_type_manager *man, const char *prefix)
 {
 }

 const struct ttm_mem_type_manager_func nouveau_gart_manager = {
 	nouveau_gart_manager_init,
 	nouveau_gart_manager_fini,
 	nouveau_gart_manager_new,
 	nouveau_gart_manager_del,
 	nouveau_gart_manager_debug
 };

 /*XXX*/
 #include <subdev/mmu/nv04.h>
 static int
 nv04_gart_manager_init(struct ttm_mem_type_manager *man, unsigned long psize)
 {
 	struct nouveau_drm *drm = nouveau_bdev(man->bdev);
 	struct nvkm_mmu *mmu = nvxx_mmu(&drm->device);
 	struct nv04_mmu *priv = (void *)mmu;
 	struct nvkm_vm *vm = NULL;
 	nvkm_vm_ref(priv->vm, &vm, NULL);
 	man->priv = vm;
 	return 0;
 }

 static int
 nv04_gart_manager_fini(struct ttm_mem_type_manager *man)
 {
 	struct nvkm_vm *vm = man->priv;
 	nvkm_vm_ref(NULL, &vm, NULL);
 	man->priv = NULL;
 	return 0;
 }

 static void
 nv04_gart_manager_del(struct ttm_mem_type_manager *man, struct ttm_mem_reg *mem)
 {
 	struct nvkm_mem *node = mem->mm_node;
 	if (node->vma[0].node)
 		nvkm_vm_put(&node->vma[0]);
 	kfree(mem->mm_node);
 	mem->mm_node = NULL;
 }

 static int
 nv04_gart_manager_new(struct ttm_mem_type_manager *man,
 		      struct ttm_buffer_object *bo,
 		      const struct ttm_place *place,
 		      struct ttm_mem_reg *mem)
 {
 	struct nvkm_mem *node;
 	int ret;

 	node = kzalloc(sizeof(*node), GFP_KERNEL);
 	if (!node)
 		return -ENOMEM;

 	node->page_shift = 12;

 	ret = nvkm_vm_get(man->priv, mem->num_pages << 12, node->page_shift,
 			  NV_MEM_ACCESS_RW, &node->vma[0]);
 	if (ret) {
 		kfree(node);
 		return ret;
 	}

 	mem->mm_node = node;
 	mem->start   = node->vma[0].offset >> PAGE_SHIFT;
 	return 0;
 }

 static void
 nv04_gart_manager_debug(struct ttm_mem_type_manager *man, const char *prefix)
 {
 }

 const struct ttm_mem_type_manager_func nv04_gart_manager = {
 	nv04_gart_manager_init,
 	nv04_gart_manager_fini,
 	nv04_gart_manager_new,
 	nv04_gart_manager_del,
 	nv04_gart_manager_debug
 };

 int
 nouveau_ttm_mmap(struct file *filp, struct vm_area_struct *vma)
 {
 	struct drm_file *file_priv = filp->private_data;
 	struct nouveau_drm *drm = nouveau_drm(file_priv->minor->dev);

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

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

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

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

 int
 nouveau_ttm_global_init(struct nouveau_drm *drm)
 {
 	struct drm_global_reference *global_ref;
 	int ret;

 	global_ref = &drm->ttm.mem_global_ref;
 	global_ref->global_type = DRM_GLOBAL_TTM_MEM;
 	global_ref->size = sizeof(struct ttm_mem_global);
 	global_ref->init = &nouveau_ttm_mem_global_init;
 	global_ref->release = &nouveau_ttm_mem_global_release;

 	ret = drm_global_item_ref(global_ref);
 	if (unlikely(ret != 0)) {
 		DRM_ERROR("Failed setting up TTM memory accounting\n");
 		drm->ttm.mem_global_ref.release = NULL;
 		return ret;
 	}

 	drm->ttm.bo_global_ref.mem_glob = global_ref->object;
 	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_init;
 	global_ref->release = &ttm_bo_global_release;

 	ret = drm_global_item_ref(global_ref);
 	if (unlikely(ret != 0)) {
 		DRM_ERROR("Failed setting up TTM BO subsystem\n");
 		drm_global_item_unref(&drm->ttm.mem_global_ref);
 		drm->ttm.mem_global_ref.release = NULL;
 		return ret;
 	}

 	return 0;
 }

 void
 nouveau_ttm_global_release(struct nouveau_drm *drm)
 {
 	if (drm->ttm.mem_global_ref.release == NULL)
 		return;

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

 int
 nouveau_ttm_init(struct nouveau_drm *drm)
 {
 	struct nvkm_device *device = nvxx_device(&drm->device);
 	struct nvkm_pci *pci = device->pci;
 	struct drm_device *dev = drm->dev;
 	u8 bits;
 	int ret;

 	if (pci && pci->agp.bridge) {
 		drm->agp.bridge = pci->agp.bridge;
 		drm->agp.base = pci->agp.base;
 		drm->agp.size = pci->agp.size;
 		drm->agp.cma = pci->agp.cma;
 	}

 	bits = nvxx_mmu(&drm->device)->dma_bits;
 	if (nvxx_device(&drm->device)->func->pci) {
 		if (drm->agp.bridge)
 			bits = 32;
 	} else if (device->func->tegra) {
 		struct nvkm_device_tegra *tegra = device->func->tegra(device);

 		/*
 		 * If the platform can use a IOMMU, then the addressable DMA
 		 * space is constrained by the IOMMU bit
 		 */
 		if (tegra->func->iommu_bit)
 			bits = min(bits, tegra->func->iommu_bit);

 	}

 	ret = dma_set_mask(dev->dev, DMA_BIT_MASK(bits));
 	if (ret && bits != 32) {
 		bits = 32;
 		ret = dma_set_mask(dev->dev, DMA_BIT_MASK(bits));
 	}
 	if (ret)
 		return ret;

 	ret = dma_set_coherent_mask(dev->dev, DMA_BIT_MASK(bits));
 	if (ret)
 		dma_set_coherent_mask(dev->dev, DMA_BIT_MASK(32));

 	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,
 				  bits <= 32 ? true : false);
 	if (ret) {
 		NV_ERROR(drm, "error initialising bo driver, %d\n", ret);
 		return ret;
 	}

 	/* VRAM init */
 	drm->gem.vram_available = drm->device.info.ram_user;

 	ret = ttm_bo_init_mm(&drm->ttm.bdev, TTM_PL_VRAM,
 			      drm->gem.vram_available >> PAGE_SHIFT);
 	if (ret) {
 		NV_ERROR(drm, "VRAM mm init failed, %d\n", ret);
 		return ret;
 	}

 	drm->ttm.mtrr = arch_phys_wc_add(device->func->resource_addr(device, 1),
 					 device->func->resource_size(device, 1));

 	/* GART init */
 	if (!drm->agp.bridge) {
 		drm->gem.gart_available = nvxx_mmu(&drm->device)->limit;
 	} else {
 		drm->gem.gart_available = drm->agp.size;
 	}

 	ret = ttm_bo_init_mm(&drm->ttm.bdev, TTM_PL_TT,
 			      drm->gem.gart_available >> PAGE_SHIFT);
 	if (ret) {
 		NV_ERROR(drm, "GART mm init failed, %d\n", ret);
 		return ret;
 	}

 	NV_INFO(drm, "VRAM: %d MiB\n", (u32)(drm->gem.vram_available >> 20));
 	NV_INFO(drm, "GART: %d MiB\n", (u32)(drm->gem.gart_available >> 20));
 	return 0;
 }

 void
 nouveau_ttm_fini(struct nouveau_drm *drm)
 {
 	ttm_bo_clean_mm(&drm->ttm.bdev, TTM_PL_VRAM);
 	ttm_bo_clean_mm(&drm->ttm.bdev, TTM_PL_TT);

 	ttm_bo_device_release(&drm->ttm.bdev);

 	nouveau_ttm_global_release(drm);

 	arch_phys_wc_del(drm->ttm.mtrr);
 	drm->ttm.mtrr = 0;
 }
	/*
	* Copyright (c) 2007-2008 Tungsten Graphics, Inc., Cedar Park, TX., USA,
	* All Rights Reserved.
	* Copyright (c) 2009 VMware, Inc., Palo Alto, CA., USA,
	* All Rights Reserved.
	*
	* 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 above copyright notice and this permission notice (including the
	* next paragraph) shall be included in all copies or substantial portions
	* of the Software.
	*
	* 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.
	*/

	#include "nouveau_drv.h"
	#include "nouveau_ttm.h"
	#include "nouveau_gem.h"

	#include "drm_legacy.h"

	#include <core/tegra.h>

	static int
	nouveau_vram_manager_init(struct ttm_mem_type_manager *man, unsigned long psize)
	{
	struct nouveau_drm *drm = nouveau_bdev(man->bdev);
	struct nvkm_fb *fb = nvxx_fb(&drm->device);
	man->priv = fb;
	return 0;
	}

	static int
	nouveau_vram_manager_fini(struct ttm_mem_type_manager *man)
	{
	man->priv = NULL;
	return 0;
	}

	static inline void
	nvkm_mem_node_cleanup(struct nvkm_mem *node)
	{
	if (node->vma[0].node) {
	nvkm_vm_unmap(&node->vma[0]);
	nvkm_vm_put(&node->vma[0]);
	}

	if (node->vma[1].node) {
	nvkm_vm_unmap(&node->vma[1]);
	nvkm_vm_put(&node->vma[1]);
	}
	}

	static void
	nouveau_vram_manager_del(struct ttm_mem_type_manager *man,
	struct ttm_mem_reg *mem)
	{
	struct nouveau_drm *drm = nouveau_bdev(man->bdev);
	struct nvkm_ram *ram = nvxx_fb(&drm->device)->ram;
	nvkm_mem_node_cleanup(mem->mm_node);
	ram->func->put(ram, (struct nvkm_mem **)&mem->mm_node);
	}

	static int
	nouveau_vram_manager_new(struct ttm_mem_type_manager *man,
	struct ttm_buffer_object *bo,
	const struct ttm_place *place,
	struct ttm_mem_reg *mem)
	{
	struct nouveau_drm *drm = nouveau_bdev(man->bdev);
	struct nvkm_ram *ram = nvxx_fb(&drm->device)->ram;
	struct nouveau_bo *nvbo = nouveau_bo(bo);
	struct nvkm_mem *node;
	u32 size_nc = 0;
	int ret;

	if (drm->device.info.ram_size == 0)
	return -ENOMEM;

	if (nvbo->tile_flags & NOUVEAU_GEM_TILE_NONCONTIG)
	size_nc = 1 << nvbo->page_shift;

	ret = ram->func->get(ram, mem->num_pages << PAGE_SHIFT,
	mem->page_alignment << PAGE_SHIFT, size_nc,
	(nvbo->tile_flags >> 8) & 0x3ff, &node);
	if (ret) {
	mem->mm_node = NULL;
	return (ret == -ENOSPC) ? 0 : ret;
	}

	node->page_shift = nvbo->page_shift;

	mem->mm_node = node;
	mem->start = node->offset >> PAGE_SHIFT;
	return 0;
	}

	const struct ttm_mem_type_manager_func nouveau_vram_manager = {
	nouveau_vram_manager_init,
	nouveau_vram_manager_fini,
	nouveau_vram_manager_new,
	nouveau_vram_manager_del,
	};

	static int
	nouveau_gart_manager_init(struct ttm_mem_type_manager *man, unsigned long psize)
	{
	return 0;
	}

	static int
	nouveau_gart_manager_fini(struct ttm_mem_type_manager *man)
	{
	return 0;
	}

	static void
	nouveau_gart_manager_del(struct ttm_mem_type_manager *man,
	struct ttm_mem_reg *mem)
	{
	nvkm_mem_node_cleanup(mem->mm_node);
	kfree(mem->mm_node);
	mem->mm_node = NULL;
	}

	static int
	nouveau_gart_manager_new(struct ttm_mem_type_manager *man,
	struct ttm_buffer_object *bo,
	const struct ttm_place *place,
	struct ttm_mem_reg *mem)
	{
	struct nouveau_drm *drm = nouveau_bdev(bo->bdev);
	struct nouveau_bo *nvbo = nouveau_bo(bo);
	struct nvkm_mem *node;

	node = kzalloc(sizeof(*node), GFP_KERNEL);
	if (!node)
	return -ENOMEM;

	node->page_shift = 12;

	switch (drm->device.info.family) {
	case NV_DEVICE_INFO_V0_TNT:
	case NV_DEVICE_INFO_V0_CELSIUS:
	case NV_DEVICE_INFO_V0_KELVIN:
	case NV_DEVICE_INFO_V0_RANKINE:
	case NV_DEVICE_INFO_V0_CURIE:
	break;
	case NV_DEVICE_INFO_V0_TESLA:
	if (drm->device.info.chipset != 0x50)
	node->memtype = (nvbo->tile_flags & 0x7f00) >> 8;
	break;
	case NV_DEVICE_INFO_V0_FERMI:
	case NV_DEVICE_INFO_V0_KEPLER:
	case NV_DEVICE_INFO_V0_MAXWELL:
	node->memtype = (nvbo->tile_flags & 0xff00) >> 8;
	break;
	default:
	NV_WARN(drm, "%s: unhandled family type %x\n", __func__,
	drm->device.info.family);
	break;
	}

	mem->mm_node = node;
	mem->start = 0;
	return 0;
	}

	static void
	nouveau_gart_manager_debug(struct ttm_mem_type_manager man, const char prefix)
	{
	}

	const struct ttm_mem_type_manager_func nouveau_gart_manager = {
	nouveau_gart_manager_init,
	nouveau_gart_manager_fini,
	nouveau_gart_manager_new,
	nouveau_gart_manager_del,
	nouveau_gart_manager_debug
	};

	/XXX/
	#include <subdev/mmu/nv04.h>
	static int
	nv04_gart_manager_init(struct ttm_mem_type_manager *man, unsigned long psize)
	{
	struct nouveau_drm *drm = nouveau_bdev(man->bdev);
	struct nvkm_mmu *mmu = nvxx_mmu(&drm->device);
	struct nv04_mmu priv = (void )mmu;
	struct nvkm_vm *vm = NULL;
	nvkm_vm_ref(priv->vm, &vm, NULL);
	man->priv = vm;
	return 0;
	}

	static int
	nv04_gart_manager_fini(struct ttm_mem_type_manager *man)
	{
	struct nvkm_vm *vm = man->priv;
	nvkm_vm_ref(NULL, &vm, NULL);
	man->priv = NULL;
	return 0;
	}

	static void
	nv04_gart_manager_del(struct ttm_mem_type_manager man, struct ttm_mem_reg mem)
	{
	struct nvkm_mem *node = mem->mm_node;
	if (node->vma[0].node)
	nvkm_vm_put(&node->vma[0]);
	kfree(mem->mm_node);
	mem->mm_node = NULL;
	}

	static int
	nv04_gart_manager_new(struct ttm_mem_type_manager *man,
	struct ttm_buffer_object *bo,
	const struct ttm_place *place,
	struct ttm_mem_reg *mem)
	{
	struct nvkm_mem *node;
	int ret;

	node = kzalloc(sizeof(*node), GFP_KERNEL);
	if (!node)
	return -ENOMEM;

	node->page_shift = 12;

	ret = nvkm_vm_get(man->priv, mem->num_pages << 12, node->page_shift,
	NV_MEM_ACCESS_RW, &node->vma[0]);
	if (ret) {
	kfree(node);
	return ret;
	}

	mem->mm_node = node;
	mem->start = node->vma[0].offset >> PAGE_SHIFT;
	return 0;
	}

	static void
	nv04_gart_manager_debug(struct ttm_mem_type_manager man, const char prefix)
	{
	}

	const struct ttm_mem_type_manager_func nv04_gart_manager = {
	nv04_gart_manager_init,
	nv04_gart_manager_fini,
	nv04_gart_manager_new,
	nv04_gart_manager_del,
	nv04_gart_manager_debug
	};

	int
	nouveau_ttm_mmap(struct file filp, struct vm_area_struct vma)
	{
	struct drm_file *file_priv = filp->private_data;
	struct nouveau_drm *drm = nouveau_drm(file_priv->minor->dev);

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

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

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

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

	int
	nouveau_ttm_global_init(struct nouveau_drm *drm)
	{
	struct drm_global_reference *global_ref;
	int ret;

	global_ref = &drm->ttm.mem_global_ref;
	global_ref->global_type = DRM_GLOBAL_TTM_MEM;
	global_ref->size = sizeof(struct ttm_mem_global);
	global_ref->init = &nouveau_ttm_mem_global_init;
	global_ref->release = &nouveau_ttm_mem_global_release;

	ret = drm_global_item_ref(global_ref);
	if (unlikely(ret != 0)) {
	DRM_ERROR("Failed setting up TTM memory accounting\n");
	drm->ttm.mem_global_ref.release = NULL;
	return ret;
	}

	drm->ttm.bo_global_ref.mem_glob = global_ref->object;
	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_init;
	global_ref->release = &ttm_bo_global_release;

	ret = drm_global_item_ref(global_ref);
	if (unlikely(ret != 0)) {
	DRM_ERROR("Failed setting up TTM BO subsystem\n");
	drm_global_item_unref(&drm->ttm.mem_global_ref);
	drm->ttm.mem_global_ref.release = NULL;
	return ret;
	}

	return 0;
	}

	void
	nouveau_ttm_global_release(struct nouveau_drm *drm)
	{
	if (drm->ttm.mem_global_ref.release == NULL)
	return;

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

	int
	nouveau_ttm_init(struct nouveau_drm *drm)
	{
	struct nvkm_device *device = nvxx_device(&drm->device);
	struct nvkm_pci *pci = device->pci;
	struct drm_device *dev = drm->dev;
	u8 bits;
	int ret;

	if (pci && pci->agp.bridge) {
	drm->agp.bridge = pci->agp.bridge;
	drm->agp.base = pci->agp.base;
	drm->agp.size = pci->agp.size;
	drm->agp.cma = pci->agp.cma;
	}

	bits = nvxx_mmu(&drm->device)->dma_bits;
	if (nvxx_device(&drm->device)->func->pci) {
	if (drm->agp.bridge)
	bits = 32;
	} else if (device->func->tegra) {
	struct nvkm_device_tegra *tegra = device->func->tegra(device);

	/*
	* If the platform can use a IOMMU, then the addressable DMA
	* space is constrained by the IOMMU bit
	*/
	if (tegra->func->iommu_bit)
	bits = min(bits, tegra->func->iommu_bit);

	}

	ret = dma_set_mask(dev->dev, DMA_BIT_MASK(bits));
	if (ret && bits != 32) {
	bits = 32;
	ret = dma_set_mask(dev->dev, DMA_BIT_MASK(bits));
	}
	if (ret)
	return ret;

	ret = dma_set_coherent_mask(dev->dev, DMA_BIT_MASK(bits));
	if (ret)
	dma_set_coherent_mask(dev->dev, DMA_BIT_MASK(32));

	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,
	bits <= 32 ? true : false);
	if (ret) {
	NV_ERROR(drm, "error initialising bo driver, %d\n", ret);
	return ret;
	}

	/* VRAM init */
	drm->gem.vram_available = drm->device.info.ram_user;

	ret = ttm_bo_init_mm(&drm->ttm.bdev, TTM_PL_VRAM,
	drm->gem.vram_available >> PAGE_SHIFT);
	if (ret) {
	NV_ERROR(drm, "VRAM mm init failed, %d\n", ret);
	return ret;
	}

	drm->ttm.mtrr = arch_phys_wc_add(device->func->resource_addr(device, 1),
	device->func->resource_size(device, 1));

	/* GART init */
	if (!drm->agp.bridge) {
	drm->gem.gart_available = nvxx_mmu(&drm->device)->limit;
	} else {
	drm->gem.gart_available = drm->agp.size;
	}

	ret = ttm_bo_init_mm(&drm->ttm.bdev, TTM_PL_TT,
	drm->gem.gart_available >> PAGE_SHIFT);
	if (ret) {
	NV_ERROR(drm, "GART mm init failed, %d\n", ret);
	return ret;
	}

	NV_INFO(drm, "VRAM: %d MiB\n", (u32)(drm->gem.vram_available >> 20));
	NV_INFO(drm, "GART: %d MiB\n", (u32)(drm->gem.gart_available >> 20));
	return 0;
	}

	void
	nouveau_ttm_fini(struct nouveau_drm *drm)
	{
	ttm_bo_clean_mm(&drm->ttm.bdev, TTM_PL_VRAM);
	ttm_bo_clean_mm(&drm->ttm.bdev, TTM_PL_TT);

	ttm_bo_device_release(&drm->ttm.bdev);

	nouveau_ttm_global_release(drm);

	arch_phys_wc_del(drm->ttm.mtrr);
	drm->ttm.mtrr = 0;
	}