struct ttm_tt *radeon_ttm_tt_create(struct ttm_bo_device *bdev,
				    unsigned long size, uint32_t page_flags,
				    struct page *dummy_read_page)
{
	struct radeon_device *rdev;
	struct radeon_ttm_tt *gtt;

	rdev = radeon_get_rdev(bdev);
#if __OS_HAS_AGP
	if (rdev->flags & RADEON_IS_AGP) {
		return ttm_agp_tt_create(bdev, rdev->ddev->agp->bridge,
					 size, page_flags, dummy_read_page);
	}
#endif

	gtt = kzalloc(sizeof(struct radeon_ttm_tt), GFP_KERNEL);
	if (gtt == NULL) {
		return NULL;
	}
	gtt->ttm.ttm.func = &radeon_backend_func;
	gtt->rdev = rdev;
	if (ttm_dma_tt_init(&gtt->ttm, bdev, size, page_flags, dummy_read_page)) {
		kfree(gtt);
		return NULL;
	}
	return &gtt->ttm.ttm;
}
示例#2
0
struct ttm_tt *
nouveau_sgdma_create_ttm(struct ttm_bo_device *bdev,
			 unsigned long size, uint32_t page_flags,
			 struct page *dummy_read_page)
{
	struct nouveau_drm *drm = nouveau_bdev(bdev);
	struct nouveau_sgdma_be *nvbe;

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

	if (drm->client.device.info.family < NV_DEVICE_INFO_V0_TESLA)
		nvbe->ttm.ttm.func = &nv04_sgdma_backend;
	else
		nvbe->ttm.ttm.func = &nv50_sgdma_backend;

	if (ttm_dma_tt_init(&nvbe->ttm, bdev, size, page_flags, dummy_read_page))
		/*
		 * A failing ttm_dma_tt_init() will call ttm_tt_destroy()
		 * and thus our nouveau_sgdma_destroy() hook, so we don't need
		 * to free nvbe here.
		 */
		return NULL;
	return &nvbe->ttm.ttm;
}
示例#3
0
static struct ttm_tt *vmw_ttm_tt_create(struct ttm_bo_device *bdev,
				 unsigned long size, uint32_t page_flags,
				 struct page *dummy_read_page)
{
	struct vmw_ttm_tt *vmw_be;
	int ret;

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

	vmw_be->dma_ttm.ttm.func = &vmw_ttm_func;
	vmw_be->dev_priv = container_of(bdev, struct vmw_private, bdev);
	vmw_be->mob = NULL;

	if (vmw_be->dev_priv->map_mode == vmw_dma_alloc_coherent)
		ret = ttm_dma_tt_init(&vmw_be->dma_ttm, bdev, size, page_flags,
				      dummy_read_page);
	else
		ret = ttm_tt_init(&vmw_be->dma_ttm.ttm, bdev, size, page_flags,
				  dummy_read_page);
	if (unlikely(ret != 0))
		goto out_no_init;

	return &vmw_be->dma_ttm.ttm;
out_no_init:
	kfree(vmw_be);
	return NULL;
}
示例#4
0
static struct ttm_tt *radeon_ttm_tt_create(struct ttm_bo_device *bdev,
				    unsigned long size, uint32_t page_flags,
				    vm_page_t dummy_read_page)
{
	struct radeon_device *rdev;
	struct radeon_ttm_tt *gtt;

	rdev = radeon_get_rdev(bdev);
#if __OS_HAS_AGP
#ifdef DUMBBELL_WIP
	if (rdev->flags & RADEON_IS_AGP) {
		return ttm_agp_tt_create(bdev, rdev->ddev->agp->agpdev,
					 size, page_flags, dummy_read_page);
	}
#endif /* DUMBBELL_WIP */
#endif

	gtt = kmalloc(sizeof(struct radeon_ttm_tt), DRM_MEM_DRIVER,
		      M_WAITOK | M_ZERO);
	if (gtt == NULL) {
		return NULL;
	}
	gtt->ttm.ttm.func = &radeon_backend_func;
	gtt->rdev = rdev;
	if (ttm_dma_tt_init(&gtt->ttm, bdev, size, page_flags, dummy_read_page)) {
		drm_free(gtt, DRM_MEM_DRIVER);
		return NULL;
	}
	return &gtt->ttm.ttm;
}
示例#5
0
static struct ttm_tt *radeon_ttm_tt_create(struct ttm_bo_device *bdev,
				    unsigned long size, uint32_t page_flags,
				    struct vm_page *dummy_read_page)
{
	struct radeon_device *rdev;
	struct radeon_ttm_tt *gtt;

	rdev = radeon_get_rdev(bdev);
#if __OS_HAS_AGP
	if (rdev->flags & RADEON_IS_AGP) {
		return ttm_agp_tt_create(bdev, rdev->ddev->agp,
					 size, page_flags, dummy_read_page);
	}
#endif

	gtt = kzalloc(sizeof(struct radeon_ttm_tt), GFP_KERNEL);
	if (gtt == NULL) {
		return NULL;
	}
	gtt->ttm.ttm.func = &radeon_backend_func;
	gtt->rdev = rdev;
	if (ttm_dma_tt_init(&gtt->ttm, bdev, size, page_flags, dummy_read_page)) {
		kfree(gtt);
		return NULL;
	}

	gtt->segs = mallocarray(gtt->ttm.ttm.num_pages,
	    sizeof(bus_dma_segment_t), M_DRM, M_WAITOK | M_ZERO);
	if (gtt->segs == NULL) {
		ttm_dma_tt_fini(&gtt->ttm);
		free(gtt, M_DRM, 0);
		return NULL;
	}

	if (bus_dmamap_create(rdev->dmat, size, gtt->ttm.ttm.num_pages, size,
			      0, BUS_DMA_WAITOK, &gtt->map)) {
		free(gtt->segs, M_DRM, 0);
		ttm_dma_tt_fini(&gtt->ttm);
		free(gtt, M_DRM, 0);
		return NULL;
	}

	return &gtt->ttm.ttm;
}
示例#6
0
文件: qxl_ttm.c 项目: acton393/linux
static struct ttm_tt *qxl_ttm_tt_create(struct ttm_bo_device *bdev,
					unsigned long size, uint32_t page_flags,
					struct page *dummy_read_page)
{
	struct qxl_device *qdev;
	struct qxl_ttm_tt *gtt;

	qdev = qxl_get_qdev(bdev);
	gtt = kzalloc(sizeof(struct qxl_ttm_tt), GFP_KERNEL);
	if (gtt == NULL)
		return NULL;
	gtt->ttm.ttm.func = &qxl_backend_func;
	gtt->qdev = qdev;
	if (ttm_dma_tt_init(&gtt->ttm, bdev, size, page_flags,
			    dummy_read_page)) {
		kfree(gtt);
		return NULL;
	}
	return &gtt->ttm.ttm;
}
示例#7
0
struct ttm_tt *
nouveau_sgdma_create_ttm(struct ttm_bo_device *bdev,
			 unsigned long size, uint32_t page_flags,
			 struct page *dummy_read_page)
{
	struct nouveau_drm *drm = nouveau_bdev(bdev);
	struct nouveau_sgdma_be *nvbe;

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

	nvbe->dev = drm->dev;
	if (nv_device(drm->device)->card_type < NV_50)
		nvbe->ttm.ttm.func = &nv04_sgdma_backend;
	else
		nvbe->ttm.ttm.func = &nv50_sgdma_backend;

	if (ttm_dma_tt_init(&nvbe->ttm, bdev, size, page_flags, dummy_read_page))
		return NULL;
	return &nvbe->ttm.ttm;
}
示例#8
0
/**
 * vmw_ttm_map_dma - Make sure TTM pages are visible to the device
 *
 * @vmw_tt: Pointer to a struct vmw_ttm_tt
 *
 * Select the correct function for and make sure the TTM pages are
 * visible to the device. Allocate storage for the device mappings.
 * If a mapping has already been performed, indicated by the storage
 * pointer being non NULL, the function returns success.
 */
static int vmw_ttm_map_dma(struct vmw_ttm_tt *vmw_tt)
{
	struct vmw_private *dev_priv = vmw_tt->dev_priv;
	struct ttm_mem_global *glob = vmw_mem_glob(dev_priv);
	struct vmw_sg_table *vsgt = &vmw_tt->vsgt;
	struct ttm_operation_ctx ctx = {
		.interruptible = true,
		.no_wait_gpu = false
	};
	struct vmw_piter iter;
	dma_addr_t old;
	int ret = 0;
	static size_t sgl_size;
	static size_t sgt_size;

	if (vmw_tt->mapped)
		return 0;

	vsgt->mode = dev_priv->map_mode;
	vsgt->pages = vmw_tt->dma_ttm.ttm.pages;
	vsgt->num_pages = vmw_tt->dma_ttm.ttm.num_pages;
	vsgt->addrs = vmw_tt->dma_ttm.dma_address;
	vsgt->sgt = &vmw_tt->sgt;

	switch (dev_priv->map_mode) {
	case vmw_dma_map_bind:
	case vmw_dma_map_populate:
		if (unlikely(!sgl_size)) {
			sgl_size = ttm_round_pot(sizeof(struct scatterlist));
			sgt_size = ttm_round_pot(sizeof(struct sg_table));
		}
		vmw_tt->sg_alloc_size = sgt_size + sgl_size * vsgt->num_pages;
		ret = ttm_mem_global_alloc(glob, vmw_tt->sg_alloc_size, &ctx);
		if (unlikely(ret != 0))
			return ret;

		ret = sg_alloc_table_from_pages(&vmw_tt->sgt, vsgt->pages,
						vsgt->num_pages, 0,
						(unsigned long)
						vsgt->num_pages << PAGE_SHIFT,
						GFP_KERNEL);
		if (unlikely(ret != 0))
			goto out_sg_alloc_fail;

		if (vsgt->num_pages > vmw_tt->sgt.nents) {
			uint64_t over_alloc =
				sgl_size * (vsgt->num_pages -
					    vmw_tt->sgt.nents);

			ttm_mem_global_free(glob, over_alloc);
			vmw_tt->sg_alloc_size -= over_alloc;
		}

		ret = vmw_ttm_map_for_dma(vmw_tt);
		if (unlikely(ret != 0))
			goto out_map_fail;

		break;
	default:
		break;
	}

	old = ~((dma_addr_t) 0);
	vmw_tt->vsgt.num_regions = 0;
	for (vmw_piter_start(&iter, vsgt, 0); vmw_piter_next(&iter);) {
		dma_addr_t cur = vmw_piter_dma_addr(&iter);

		if (cur != old + PAGE_SIZE)
			vmw_tt->vsgt.num_regions++;
		old = cur;
	}

	vmw_tt->mapped = true;
	return 0;

out_map_fail:
	sg_free_table(vmw_tt->vsgt.sgt);
	vmw_tt->vsgt.sgt = NULL;
out_sg_alloc_fail:
	ttm_mem_global_free(glob, vmw_tt->sg_alloc_size);
	return ret;
}

/**
 * vmw_ttm_unmap_dma - Tear down any TTM page device mappings
 *
 * @vmw_tt: Pointer to a struct vmw_ttm_tt
 *
 * Tear down any previously set up device DMA mappings and free
 * any storage space allocated for them. If there are no mappings set up,
 * this function is a NOP.
 */
static void vmw_ttm_unmap_dma(struct vmw_ttm_tt *vmw_tt)
{
	struct vmw_private *dev_priv = vmw_tt->dev_priv;

	if (!vmw_tt->vsgt.sgt)
		return;

	switch (dev_priv->map_mode) {
	case vmw_dma_map_bind:
	case vmw_dma_map_populate:
		vmw_ttm_unmap_from_dma(vmw_tt);
		sg_free_table(vmw_tt->vsgt.sgt);
		vmw_tt->vsgt.sgt = NULL;
		ttm_mem_global_free(vmw_mem_glob(dev_priv),
				    vmw_tt->sg_alloc_size);
		break;
	default:
		break;
	}
	vmw_tt->mapped = false;
}


/**
 * vmw_bo_map_dma - Make sure buffer object pages are visible to the device
 *
 * @bo: Pointer to a struct ttm_buffer_object
 *
 * Wrapper around vmw_ttm_map_dma, that takes a TTM buffer object pointer
 * instead of a pointer to a struct vmw_ttm_backend as argument.
 * Note that the buffer object must be either pinned or reserved before
 * calling this function.
 */
int vmw_bo_map_dma(struct ttm_buffer_object *bo)
{
	struct vmw_ttm_tt *vmw_tt =
		container_of(bo->ttm, struct vmw_ttm_tt, dma_ttm.ttm);

	return vmw_ttm_map_dma(vmw_tt);
}


/**
 * vmw_bo_unmap_dma - Make sure buffer object pages are visible to the device
 *
 * @bo: Pointer to a struct ttm_buffer_object
 *
 * Wrapper around vmw_ttm_unmap_dma, that takes a TTM buffer object pointer
 * instead of a pointer to a struct vmw_ttm_backend as argument.
 */
void vmw_bo_unmap_dma(struct ttm_buffer_object *bo)
{
	struct vmw_ttm_tt *vmw_tt =
		container_of(bo->ttm, struct vmw_ttm_tt, dma_ttm.ttm);

	vmw_ttm_unmap_dma(vmw_tt);
}


/**
 * vmw_bo_sg_table - Return a struct vmw_sg_table object for a
 * TTM buffer object
 *
 * @bo: Pointer to a struct ttm_buffer_object
 *
 * Returns a pointer to a struct vmw_sg_table object. The object should
 * not be freed after use.
 * Note that for the device addresses to be valid, the buffer object must
 * either be reserved or pinned.
 */
const struct vmw_sg_table *vmw_bo_sg_table(struct ttm_buffer_object *bo)
{
	struct vmw_ttm_tt *vmw_tt =
		container_of(bo->ttm, struct vmw_ttm_tt, dma_ttm.ttm);

	return &vmw_tt->vsgt;
}


static int vmw_ttm_bind(struct ttm_tt *ttm, struct ttm_mem_reg *bo_mem)
{
	struct vmw_ttm_tt *vmw_be =
		container_of(ttm, struct vmw_ttm_tt, dma_ttm.ttm);
	int ret;

	ret = vmw_ttm_map_dma(vmw_be);
	if (unlikely(ret != 0))
		return ret;

	vmw_be->gmr_id = bo_mem->start;
	vmw_be->mem_type = bo_mem->mem_type;

	switch (bo_mem->mem_type) {
	case VMW_PL_GMR:
		return vmw_gmr_bind(vmw_be->dev_priv, &vmw_be->vsgt,
				    ttm->num_pages, vmw_be->gmr_id);
	case VMW_PL_MOB:
		if (unlikely(vmw_be->mob == NULL)) {
			vmw_be->mob =
				vmw_mob_create(ttm->num_pages);
			if (unlikely(vmw_be->mob == NULL))
				return -ENOMEM;
		}

		return vmw_mob_bind(vmw_be->dev_priv, vmw_be->mob,
				    &vmw_be->vsgt, ttm->num_pages,
				    vmw_be->gmr_id);
	default:
		BUG();
	}
	return 0;
}

static int vmw_ttm_unbind(struct ttm_tt *ttm)
{
	struct vmw_ttm_tt *vmw_be =
		container_of(ttm, struct vmw_ttm_tt, dma_ttm.ttm);

	switch (vmw_be->mem_type) {
	case VMW_PL_GMR:
		vmw_gmr_unbind(vmw_be->dev_priv, vmw_be->gmr_id);
		break;
	case VMW_PL_MOB:
		vmw_mob_unbind(vmw_be->dev_priv, vmw_be->mob);
		break;
	default:
		BUG();
	}

	if (vmw_be->dev_priv->map_mode == vmw_dma_map_bind)
		vmw_ttm_unmap_dma(vmw_be);

	return 0;
}


static void vmw_ttm_destroy(struct ttm_tt *ttm)
{
	struct vmw_ttm_tt *vmw_be =
		container_of(ttm, struct vmw_ttm_tt, dma_ttm.ttm);

	vmw_ttm_unmap_dma(vmw_be);
	if (vmw_be->dev_priv->map_mode == vmw_dma_alloc_coherent)
		ttm_dma_tt_fini(&vmw_be->dma_ttm);
	else
		ttm_tt_fini(ttm);

	if (vmw_be->mob)
		vmw_mob_destroy(vmw_be->mob);

	kfree(vmw_be);
}


static int vmw_ttm_populate(struct ttm_tt *ttm, struct ttm_operation_ctx *ctx)
{
	struct vmw_ttm_tt *vmw_tt =
		container_of(ttm, struct vmw_ttm_tt, dma_ttm.ttm);
	struct vmw_private *dev_priv = vmw_tt->dev_priv;
	struct ttm_mem_global *glob = vmw_mem_glob(dev_priv);
	int ret;

	if (ttm->state != tt_unpopulated)
		return 0;

	if (dev_priv->map_mode == vmw_dma_alloc_coherent) {
		size_t size =
			ttm_round_pot(ttm->num_pages * sizeof(dma_addr_t));
		ret = ttm_mem_global_alloc(glob, size, ctx);
		if (unlikely(ret != 0))
			return ret;

		ret = ttm_dma_populate(&vmw_tt->dma_ttm, dev_priv->dev->dev,
					ctx);
		if (unlikely(ret != 0))
			ttm_mem_global_free(glob, size);
	} else
		ret = ttm_pool_populate(ttm, ctx);

	return ret;
}

static void vmw_ttm_unpopulate(struct ttm_tt *ttm)
{
	struct vmw_ttm_tt *vmw_tt = container_of(ttm, struct vmw_ttm_tt,
						 dma_ttm.ttm);
	struct vmw_private *dev_priv = vmw_tt->dev_priv;
	struct ttm_mem_global *glob = vmw_mem_glob(dev_priv);


	if (vmw_tt->mob) {
		vmw_mob_destroy(vmw_tt->mob);
		vmw_tt->mob = NULL;
	}

	vmw_ttm_unmap_dma(vmw_tt);
	if (dev_priv->map_mode == vmw_dma_alloc_coherent) {
		size_t size =
			ttm_round_pot(ttm->num_pages * sizeof(dma_addr_t));

		ttm_dma_unpopulate(&vmw_tt->dma_ttm, dev_priv->dev->dev);
		ttm_mem_global_free(glob, size);
	} else
		ttm_pool_unpopulate(ttm);
}

static struct ttm_backend_func vmw_ttm_func = {
	.bind = vmw_ttm_bind,
	.unbind = vmw_ttm_unbind,
	.destroy = vmw_ttm_destroy,
};

static struct ttm_tt *vmw_ttm_tt_create(struct ttm_buffer_object *bo,
					uint32_t page_flags)
{
	struct vmw_ttm_tt *vmw_be;
	int ret;

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

	vmw_be->dma_ttm.ttm.func = &vmw_ttm_func;
	vmw_be->dev_priv = container_of(bo->bdev, struct vmw_private, bdev);
	vmw_be->mob = NULL;

	if (vmw_be->dev_priv->map_mode == vmw_dma_alloc_coherent)
		ret = ttm_dma_tt_init(&vmw_be->dma_ttm, bo, page_flags);
	else
		ret = ttm_tt_init(&vmw_be->dma_ttm.ttm, bo, page_flags);
	if (unlikely(ret != 0))
		goto out_no_init;

	return &vmw_be->dma_ttm.ttm;
out_no_init:
	kfree(vmw_be);
	return NULL;
}

static int vmw_invalidate_caches(struct ttm_bo_device *bdev, uint32_t flags)
{
	return 0;
}

static int vmw_init_mem_type(struct ttm_bo_device *bdev, uint32_t type,
		      struct ttm_mem_type_manager *man)
{
	switch (type) {
	case TTM_PL_SYSTEM:
		/* System memory */

		man->flags = TTM_MEMTYPE_FLAG_MAPPABLE;
		man->available_caching = TTM_PL_FLAG_CACHED;
		man->default_caching = TTM_PL_FLAG_CACHED;
		break;
	case TTM_PL_VRAM:
		/* "On-card" video ram */
		man->func = &ttm_bo_manager_func;
		man->gpu_offset = 0;
		man->flags = TTM_MEMTYPE_FLAG_FIXED | TTM_MEMTYPE_FLAG_MAPPABLE;
		man->available_caching = TTM_PL_FLAG_CACHED;
		man->default_caching = TTM_PL_FLAG_CACHED;
		break;
	case VMW_PL_GMR:
	case VMW_PL_MOB:
		/*
		 * "Guest Memory Regions" is an aperture like feature with
		 *  one slot per bo. There is an upper limit of the number of
		 *  slots as well as the bo size.
		 */
		man->func = &vmw_gmrid_manager_func;
		man->gpu_offset = 0;
		man->flags = TTM_MEMTYPE_FLAG_CMA | TTM_MEMTYPE_FLAG_MAPPABLE;
		man->available_caching = TTM_PL_FLAG_CACHED;
		man->default_caching = TTM_PL_FLAG_CACHED;
		break;
	default:
		DRM_ERROR("Unsupported memory type %u\n", (unsigned)type);
		return -EINVAL;
	}
	return 0;
}

static void vmw_evict_flags(struct ttm_buffer_object *bo,
		     struct ttm_placement *placement)
{
	*placement = vmw_sys_placement;
}

static int vmw_verify_access(struct ttm_buffer_object *bo, struct file *filp)
{
	struct ttm_object_file *tfile =
		vmw_fpriv((struct drm_file *)filp->private_data)->tfile;

	return vmw_user_bo_verify_access(bo, tfile);
}

static int vmw_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 vmw_private *dev_priv = container_of(bdev, struct vmw_private, bdev);

	mem->bus.addr = NULL;
	mem->bus.is_iomem = false;
	mem->bus.offset = 0;
	mem->bus.size = mem->num_pages << PAGE_SHIFT;
	mem->bus.base = 0;
	if (!(man->flags & TTM_MEMTYPE_FLAG_MAPPABLE))
		return -EINVAL;
	switch (mem->mem_type) {
	case TTM_PL_SYSTEM:
	case VMW_PL_GMR:
	case VMW_PL_MOB:
		return 0;
	case TTM_PL_VRAM:
		mem->bus.offset = mem->start << PAGE_SHIFT;
		mem->bus.base = dev_priv->vram_start;
		mem->bus.is_iomem = true;
		break;
	default:
		return -EINVAL;
	}
	return 0;
}

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

static int vmw_ttm_fault_reserve_notify(struct ttm_buffer_object *bo)
{
	return 0;
}

/**
 * vmw_move_notify - TTM move_notify_callback
 *
 * @bo: The TTM buffer object about to move.
 * @mem: The struct ttm_mem_reg indicating to what memory
 *       region the move is taking place.
 *
 * Calls move_notify for all subsystems needing it.
 * (currently only resources).
 */
static void vmw_move_notify(struct ttm_buffer_object *bo,
			    bool evict,
			    struct ttm_mem_reg *mem)
{
	vmw_bo_move_notify(bo, mem);
	vmw_query_move_notify(bo, mem);
}
示例#9
0
文件: virtgpu_ttm.c 项目: Lyude/linux
static void virtio_gpu_evict_flags(struct ttm_buffer_object *bo,
				struct ttm_placement *placement)
{
	static const struct ttm_place placements = {
		.fpfn  = 0,
		.lpfn  = 0,
		.flags = TTM_PL_MASK_CACHING | TTM_PL_FLAG_SYSTEM,
	};

	placement->placement = &placements;
	placement->busy_placement = &placements;
	placement->num_placement = 1;
	placement->num_busy_placement = 1;
}

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

static int virtio_gpu_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];

	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:
	case TTM_PL_TT:
		/* system memory */
		return 0;
	default:
		return -EINVAL;
	}
	return 0;
}

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

/*
 * TTM backend functions.
 */
struct virtio_gpu_ttm_tt {
	struct ttm_dma_tt		ttm;
	struct virtio_gpu_device	*vgdev;
	u64				offset;
};

static int virtio_gpu_ttm_backend_bind(struct ttm_tt *ttm,
				       struct ttm_mem_reg *bo_mem)
{
	struct virtio_gpu_ttm_tt *gtt = (void *)ttm;

	gtt->offset = (unsigned long)(bo_mem->start << PAGE_SHIFT);
	if (!ttm->num_pages)
		WARN(1, "nothing to bind %lu pages for mreg %p back %p!\n",
		     ttm->num_pages, bo_mem, ttm);

	/* Not implemented */
	return 0;
}

static int virtio_gpu_ttm_backend_unbind(struct ttm_tt *ttm)
{
	/* Not implemented */
	return 0;
}

static void virtio_gpu_ttm_backend_destroy(struct ttm_tt *ttm)
{
	struct virtio_gpu_ttm_tt *gtt = (void *)ttm;

	ttm_dma_tt_fini(&gtt->ttm);
	kfree(gtt);
}

static struct ttm_backend_func virtio_gpu_backend_func = {
	.bind = &virtio_gpu_ttm_backend_bind,
	.unbind = &virtio_gpu_ttm_backend_unbind,
	.destroy = &virtio_gpu_ttm_backend_destroy,
};

static struct ttm_tt *virtio_gpu_ttm_tt_create(struct ttm_buffer_object *bo,
					       uint32_t page_flags)
{
	struct virtio_gpu_device *vgdev;
	struct virtio_gpu_ttm_tt *gtt;

	vgdev = virtio_gpu_get_vgdev(bo->bdev);
	gtt = kzalloc(sizeof(struct virtio_gpu_ttm_tt), GFP_KERNEL);
	if (gtt == NULL)
		return NULL;
	gtt->ttm.ttm.func = &virtio_gpu_backend_func;
	gtt->vgdev = vgdev;
	if (ttm_dma_tt_init(&gtt->ttm, bo, page_flags)) {
		kfree(gtt);
		return NULL;
	}
	return &gtt->ttm.ttm;
}

static void virtio_gpu_move_null(struct ttm_buffer_object *bo,
				 struct ttm_mem_reg *new_mem)
{
	struct ttm_mem_reg *old_mem = &bo->mem;

	BUG_ON(old_mem->mm_node != NULL);
	*old_mem = *new_mem;
	new_mem->mm_node = NULL;
}

static int virtio_gpu_bo_move(struct ttm_buffer_object *bo, bool evict,
			      struct ttm_operation_ctx *ctx,
			      struct ttm_mem_reg *new_mem)
{
	int ret;

	ret = ttm_bo_wait(bo, ctx->interruptible, ctx->no_wait_gpu);
	if (ret)
		return ret;

	virtio_gpu_move_null(bo, new_mem);
	return 0;
}