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/**************************************************************************

 *

 * Copyright © 2009-2015 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 "vmwgfx_drv.h"

#include 

#include 

#include 

static struct ttm_place vram_placement_flags = {

	.fpfn = 0,

	.lpfn = 0,

	.flags = TTM_PL_FLAG_VRAM | TTM_PL_FLAG_CACHED

};

static struct ttm_place vram_ne_placement_flags = {

	.fpfn = 0,

	.lpfn = 0,

	.flags = TTM_PL_FLAG_VRAM | TTM_PL_FLAG_CACHED | TTM_PL_FLAG_NO_EVICT

};

static struct ttm_place sys_placement_flags = {

	.fpfn = 0,

	.lpfn = 0,

	.flags = TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED

};

static struct ttm_place sys_ne_placement_flags = {

	.fpfn = 0,

	.lpfn = 0,

	.flags = TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED | TTM_PL_FLAG_NO_EVICT

};

static struct ttm_place gmr_placement_flags = {

	.fpfn = 0,

	.lpfn = 0,

	.flags = VMW_PL_FLAG_GMR | TTM_PL_FLAG_CACHED

};

static struct ttm_place gmr_ne_placement_flags = {

	.fpfn = 0,

	.lpfn = 0,

	.flags = VMW_PL_FLAG_GMR | TTM_PL_FLAG_CACHED | TTM_PL_FLAG_NO_EVICT

};

static struct ttm_place mob_placement_flags = {

	.fpfn = 0,

	.lpfn = 0,

	.flags = VMW_PL_FLAG_MOB | TTM_PL_FLAG_CACHED

};

static struct ttm_place mob_ne_placement_flags = {

	.fpfn = 0,

	.lpfn = 0,

	.flags = VMW_PL_FLAG_MOB | TTM_PL_FLAG_CACHED | TTM_PL_FLAG_NO_EVICT

};

struct ttm_placement vmw_vram_placement = {

	.num_placement = 1,

	.placement = &vram_placement_flags,

	.num_busy_placement = 1,

	.busy_placement = &vram_placement_flags

};

static struct ttm_place vram_gmr_placement_flags[] = {

	{

		.fpfn = 0,

		.lpfn = 0,

		.flags = TTM_PL_FLAG_VRAM | TTM_PL_FLAG_CACHED

	}, {

		.fpfn = 0,

		.lpfn = 0,

		.flags = VMW_PL_FLAG_GMR | TTM_PL_FLAG_CACHED

	}

};

static struct ttm_place gmr_vram_placement_flags[] = {

	{

		.fpfn = 0,

		.lpfn = 0,

		.flags = VMW_PL_FLAG_GMR | TTM_PL_FLAG_CACHED

	}, {

		.fpfn = 0,

		.lpfn = 0,

		.flags = TTM_PL_FLAG_VRAM | TTM_PL_FLAG_CACHED

	}

};

struct ttm_placement vmw_vram_gmr_placement = {

	.num_placement = 2,

	.placement = vram_gmr_placement_flags,

	.num_busy_placement = 1,

	.busy_placement = &gmr_placement_flags

};

static struct ttm_place vram_gmr_ne_placement_flags[] = {

	{

		.fpfn = 0,

		.lpfn = 0,

		.flags = TTM_PL_FLAG_VRAM | TTM_PL_FLAG_CACHED |

			 TTM_PL_FLAG_NO_EVICT

	}, {

		.fpfn = 0,

		.lpfn = 0,

		.flags = VMW_PL_FLAG_GMR | TTM_PL_FLAG_CACHED |

			 TTM_PL_FLAG_NO_EVICT

	}

};

struct ttm_placement vmw_vram_gmr_ne_placement = {

	.num_placement = 2,

	.placement = vram_gmr_ne_placement_flags,

	.num_busy_placement = 1,

	.busy_placement = &gmr_ne_placement_flags

};

struct ttm_placement vmw_vram_sys_placement = {

	.num_placement = 1,

	.placement = &vram_placement_flags,

	.num_busy_placement = 1,

	.busy_placement = &sys_placement_flags

};

struct ttm_placement vmw_vram_ne_placement = {

	.num_placement = 1,

	.placement = &vram_ne_placement_flags,

	.num_busy_placement = 1,

	.busy_placement = &vram_ne_placement_flags

};

struct ttm_placement vmw_sys_placement = {

	.num_placement = 1,

	.placement = &sys_placement_flags,

	.num_busy_placement = 1,

	.busy_placement = &sys_placement_flags

};

struct ttm_placement vmw_sys_ne_placement = {

	.num_placement = 1,

	.placement = &sys_ne_placement_flags,

	.num_busy_placement = 1,

	.busy_placement = &sys_ne_placement_flags

};

static struct ttm_place evictable_placement_flags[] = {

	{

		.fpfn = 0,

		.lpfn = 0,

		.flags = TTM_PL_FLAG_SYSTEM | TTM_PL_FLAG_CACHED

	}, {

		.fpfn = 0,

		.lpfn = 0,

		.flags = TTM_PL_FLAG_VRAM | TTM_PL_FLAG_CACHED

	}, {

		.fpfn = 0,

		.lpfn = 0,

		.flags = VMW_PL_FLAG_GMR | TTM_PL_FLAG_CACHED

	}, {

		.fpfn = 0,

		.lpfn = 0,

		.flags = VMW_PL_FLAG_MOB | TTM_PL_FLAG_CACHED

	}

};

struct ttm_placement vmw_evictable_placement = {

	.num_placement = 4,

	.placement = evictable_placement_flags,

	.num_busy_placement = 1,

	.busy_placement = &sys_placement_flags

};

struct ttm_placement vmw_srf_placement = {

	.num_placement = 1,

	.num_busy_placement = 2,

	.placement = &gmr_placement_flags,

	.busy_placement = gmr_vram_placement_flags

};

struct ttm_placement vmw_mob_placement = {

	.num_placement = 1,

	.num_busy_placement = 1,

	.placement = &mob_placement_flags,

	.busy_placement = &mob_placement_flags

};

struct ttm_placement vmw_mob_ne_placement = {

	.num_placement = 1,

	.num_busy_placement = 1,

	.placement = &mob_ne_placement_flags,

	.busy_placement = &mob_ne_placement_flags

};

struct vmw_ttm_tt {

	struct ttm_dma_tt dma_ttm;

	struct vmw_private *dev_priv;

	int gmr_id;

	struct vmw_mob *mob;

	int mem_type;

	struct sg_table sgt;

	struct vmw_sg_table vsgt;

	uint64_t sg_alloc_size;

	bool mapped;

};

const size_t vmw_tt_size = sizeof(struct vmw_ttm_tt);

/**

 * Helper functions to advance a struct vmw_piter iterator.

 *

 * @viter: Pointer to the iterator.

 *

 * These functions return false if past the end of the list,

 * true otherwise. Functions are selected depending on the current

 * DMA mapping mode.

 */

static bool __vmw_piter_non_sg_next(struct vmw_piter *viter)

{

	return ++(viter->i) < viter->num_pages;

}

static bool __vmw_piter_sg_next(struct vmw_piter *viter)

{

	return __sg_page_iter_next(&viter->iter);

}

/**

 * Helper functions to return a pointer to the current page.

 *

 * @viter: Pointer to the iterator

 *

 * These functions return a pointer to the page currently

 * pointed to by @viter. Functions are selected depending on the

 * current mapping mode.

 */

static struct page *__vmw_piter_non_sg_page(struct vmw_piter *viter)

{

	return viter->pages[viter->i];

}

static struct page *__vmw_piter_sg_page(struct vmw_piter *viter)

{

	return sg_page_iter_page(&viter->iter);

}

/**

 * Helper functions to return the DMA address of the current page.

 *

 * @viter: Pointer to the iterator

 *

 * These functions return the DMA address of the page currently

 * pointed to by @viter. Functions are selected depending on the

 * current mapping mode.

 */

static dma_addr_t __vmw_piter_phys_addr(struct vmw_piter *viter)

{

	return page_to_phys(viter->pages[viter->i]);

}

static dma_addr_t __vmw_piter_dma_addr(struct vmw_piter *viter)

{

	return viter->addrs[viter->i];

}

static dma_addr_t __vmw_piter_sg_addr(struct vmw_piter *viter)

{

	return sg_page_iter_dma_address(&viter->iter);

}

/**

 * vmw_piter_start - Initialize a struct vmw_piter.

 *

 * @viter: Pointer to the iterator to initialize

 * @vsgt: Pointer to a struct vmw_sg_table to initialize from

 *

 * Note that we're following the convention of __sg_page_iter_start, so that

 * the iterator doesn't point to a valid page after initialization; it has

 * to be advanced one step first.

 */

void vmw_piter_start(struct vmw_piter *viter, const struct vmw_sg_table *vsgt,

		     unsigned long p_offset)

{

	viter->i = p_offset - 1;

	viter->num_pages = vsgt->num_pages;

	switch (vsgt->mode) {

	case vmw_dma_phys:

		viter->next = &__vmw_piter_non_sg_next;

		viter->dma_address = &__vmw_piter_phys_addr;

		viter->page = &__vmw_piter_non_sg_page;

		viter->pages = vsgt->pages;

		break;

	case vmw_dma_alloc_coherent:

		viter->next = &__vmw_piter_non_sg_next;

		viter->dma_address = &__vmw_piter_dma_addr;

		viter->page = &__vmw_piter_non_sg_page;

		viter->addrs = vsgt->addrs;

		viter->pages = vsgt->pages;

		break;

	case vmw_dma_map_populate:

	case vmw_dma_map_bind:

		viter->next = &__vmw_piter_sg_next;

		viter->dma_address = &__vmw_piter_sg_addr;

		viter->page = &__vmw_piter_sg_page;

		__sg_page_iter_start(&viter->iter, vsgt->sgt->sgl,

				     vsgt->sgt->orig_nents, p_offset);

		break;

	default:

		BUG();

	}

}

/**

 * vmw_ttm_unmap_from_dma - unmap  device addresses previsouly mapped for

 * TTM pages

 *

 * @vmw_tt: Pointer to a struct vmw_ttm_backend

 *

 * Used to free dma mappings previously mapped by vmw_ttm_map_for_dma.

 */

static void vmw_ttm_unmap_from_dma(struct vmw_ttm_tt *vmw_tt)

{

	struct device *dev = vmw_tt->dev_priv->dev->dev;

	dma_unmap_sg(dev, vmw_tt->sgt.sgl, vmw_tt->sgt.nents,

		DMA_BIDIRECTIONAL);

	vmw_tt->sgt.nents = vmw_tt->sgt.orig_nents;

}

/**

 * vmw_ttm_map_for_dma - map TTM pages to get device addresses

 *

 * @vmw_tt: Pointer to a struct vmw_ttm_backend

 *

 * This function is used to get device addresses from the kernel DMA layer.

 * However, it's violating the DMA API in that when this operation has been

 * performed, it's illegal for the CPU to write to the pages without first

 * unmapping the DMA mappings, or calling dma_sync_sg_for_cpu(). It is

 * therefore only legal to call this function if we know that the function

 * dma_sync_sg_for_cpu() is a NOP, and dma_sync_sg_for_device() is at most

 * a CPU write buffer flush.

 */

static int vmw_ttm_map_for_dma(struct vmw_ttm_tt *vmw_tt)

{

	struct device *dev = vmw_tt->dev_priv->dev->dev;

	int ret;

	ret = dma_map_sg(dev, vmw_tt->sgt.sgl, vmw_tt->sgt.orig_nents,

			 DMA_BIDIRECTIONAL);

	if (unlikely(ret == 0))

		return -ENOMEM;

	vmw_tt->sgt.nents = ret;

	return 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 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, false,

					   true);

		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 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, false, true);

		if (unlikely(ret != 0))

			return ret;

		ret = ttm_dma_populate(&vmw_tt->dma_ttm, dev_priv->dev->dev);

		if (unlikely(ret != 0))

			ttm_mem_global_free(glob, size);

	} else

		ret = ttm_pool_populate(ttm);

	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_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;

}

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 0; //vmw_user_dmabuf_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,

			    struct ttm_mem_reg *mem)

{

	vmw_resource_move_notify(bo, mem);

}

/**

 * vmw_swap_notify - TTM move_notify_callback

 *

 * @bo: The TTM buffer object about to be swapped out.

 */

static void vmw_swap_notify(struct ttm_buffer_object *bo)

{

	ttm_bo_wait(bo, false, false, false);

}

struct ttm_bo_driver vmw_bo_driver = {

	.ttm_tt_create = &vmw_ttm_tt_create,

	.ttm_tt_populate = &vmw_ttm_populate,

	.ttm_tt_unpopulate = &vmw_ttm_unpopulate,

	.invalidate_caches = vmw_invalidate_caches,

	.init_mem_type = vmw_init_mem_type,

	.evict_flags = vmw_evict_flags,

	.move = NULL,

	.verify_access = vmw_verify_access,

	.move_notify = vmw_move_notify,

	.swap_notify = vmw_swap_notify,

	.fault_reserve_notify = &vmw_ttm_fault_reserve_notify,

	.io_mem_reserve = &vmw_ttm_io_mem_reserve,

	.io_mem_free = &vmw_ttm_io_mem_free,

};