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

 *

 * Copyright (c) 2006-2009 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.

 *

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

/*

 * Authors: Thomas Hellstrom 

 */

#define pr_fmt(fmt) "[TTM] " fmt

#include 

#include 

#include 

#include 

#include 

#include 

#include 

#include 

#define TTM_ASSERT_LOCKED(param)

#define TTM_DEBUG(fmt, arg...)

#define TTM_BO_HASH_ORDER 13

#define pr_err(fmt, ...) \

        printk(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__)

int ttm_mem_io_lock(struct ttm_mem_type_manager *man, bool interruptible)

{

    mutex_lock(&man->io_reserve_mutex);

    return 0;

}

void ttm_mem_io_unlock(struct ttm_mem_type_manager *man)

{

    if (likely(man->io_reserve_fastpath))

        return;

    mutex_unlock(&man->io_reserve_mutex);

}

#if 0

static void ttm_mem_type_debug(struct ttm_bo_device *bdev, int mem_type)

{

    struct ttm_mem_type_manager *man = &bdev->man[mem_type];

    pr_err("    has_type: %d\n", man->has_type);

    pr_err("    use_type: %d\n", man->use_type);

    pr_err("    flags: 0x%08X\n", man->flags);

    pr_err("    gpu_offset: 0x%08lX\n", man->gpu_offset);

    pr_err("    size: %llu\n", man->size);

    pr_err("    available_caching: 0x%08X\n", man->available_caching);

    pr_err("    default_caching: 0x%08X\n", man->default_caching);

    if (mem_type != TTM_PL_SYSTEM)

        (*man->func->debug)(man, TTM_PFX);

}

static void ttm_bo_mem_space_debug(struct ttm_buffer_object *bo,

                    struct ttm_placement *placement)

{

    int i, ret, mem_type;

    pr_err("No space for %p (%lu pages, %luK, %luM)\n",

           bo, bo->mem.num_pages, bo->mem.size >> 10,

           bo->mem.size >> 20);

    for (i = 0; i < placement->num_placement; i++) {

        ret = ttm_mem_type_from_flags(placement->placement[i],

                        &mem_type);

        if (ret)

            return;

        pr_err("  placement[%d]=0x%08X (%d)\n",

               i, placement->placement[i], mem_type);

        ttm_mem_type_debug(bo->bdev, mem_type);

    }

}

static ssize_t ttm_bo_global_show(struct kobject *kobj,

                  struct attribute *attr,

                  char *buffer)

{

    struct ttm_bo_global *glob =

        container_of(kobj, struct ttm_bo_global, kobj);

    return snprintf(buffer, PAGE_SIZE, "%lu\n",

            (unsigned long) atomic_read(&glob->bo_count));

}

static struct attribute *ttm_bo_global_attrs[] = {

    &ttm_bo_count,

    NULL

};

static const struct sysfs_ops ttm_bo_global_ops = {

    .show = &ttm_bo_global_show

};

static struct kobj_type ttm_bo_glob_kobj_type  = {

    .release = &ttm_bo_global_kobj_release,

    .sysfs_ops = &ttm_bo_global_ops,

    .default_attrs = ttm_bo_global_attrs

};

#endif

static inline uint32_t ttm_bo_type_flags(unsigned type)

{

	return 1 << (type);

}

static void ttm_bo_release_list(struct kref *list_kref)

{

	struct ttm_buffer_object *bo =

	    container_of(list_kref, struct ttm_buffer_object, list_kref);

	struct ttm_bo_device *bdev = bo->bdev;

	size_t acc_size = bo->acc_size;

	BUG_ON(atomic_read(&bo->list_kref.refcount));

	BUG_ON(atomic_read(&bo->kref.refcount));

	BUG_ON(atomic_read(&bo->cpu_writers));

	BUG_ON(bo->sync_obj != NULL);

	BUG_ON(bo->mem.mm_node != NULL);

	BUG_ON(!list_empty(&bo->lru));

	BUG_ON(!list_empty(&bo->ddestroy));

	if (bo->ttm)

		ttm_tt_destroy(bo->ttm);

	atomic_dec(&bo->glob->bo_count);

	if (bo->destroy)

		bo->destroy(bo);

	else {

		kfree(bo);

	}

	ttm_mem_global_free(bdev->glob->mem_glob, acc_size);

}

void ttm_bo_add_to_lru(struct ttm_buffer_object *bo)

{

	struct ttm_bo_device *bdev = bo->bdev;

	struct ttm_mem_type_manager *man;

//	BUG_ON(!ttm_bo_is_reserved(bo));

	if (!(bo->mem.placement & TTM_PL_FLAG_NO_EVICT)) {

		BUG_ON(!list_empty(&bo->lru));

		man = &bdev->man[bo->mem.mem_type];

		list_add_tail(&bo->lru, &man->lru);

		kref_get(&bo->list_kref);

		if (bo->ttm != NULL) {

			list_add_tail(&bo->swap, &bo->glob->swap_lru);

			kref_get(&bo->list_kref);

		}

	}

}

EXPORT_SYMBOL(ttm_bo_add_to_lru);

int ttm_bo_del_from_lru(struct ttm_buffer_object *bo)

{

	int put_count = 0;

	if (!list_empty(&bo->swap)) {

		list_del_init(&bo->swap);

		++put_count;

	}

	if (!list_empty(&bo->lru)) {

		list_del_init(&bo->lru);

		++put_count;

	}

	/*

	 * TODO: Add a driver hook to delete from

	 * driver-specific LRU's here.

	 */

	return put_count;

}

static void ttm_bo_ref_bug(struct kref *list_kref)

{

	BUG();

}

void ttm_bo_list_ref_sub(struct ttm_buffer_object *bo, int count,

			 bool never_free)

{

//   kref_sub(&bo->list_kref, count,

//        (never_free) ? ttm_bo_ref_bug : ttm_bo_release_list);

}

void ttm_bo_del_sub_from_lru(struct ttm_buffer_object *bo)

{

	int put_count;

	spin_lock(&bo->glob->lru_lock);

	put_count = ttm_bo_del_from_lru(bo);

	spin_unlock(&bo->glob->lru_lock);

	ttm_bo_list_ref_sub(bo, put_count, true);

}

EXPORT_SYMBOL(ttm_bo_del_sub_from_lru);

/*

 * Call bo->mutex locked.

 */

static int ttm_bo_add_ttm(struct ttm_buffer_object *bo, bool zero_alloc)

{

	struct ttm_bo_device *bdev = bo->bdev;

	struct ttm_bo_global *glob = bo->glob;

	int ret = 0;

	uint32_t page_flags = 0;

	TTM_ASSERT_LOCKED(&bo->mutex);

	bo->ttm = NULL;

	if (bdev->need_dma32)

		page_flags |= TTM_PAGE_FLAG_DMA32;

	switch (bo->type) {

	case ttm_bo_type_device:

		if (zero_alloc)

			page_flags |= TTM_PAGE_FLAG_ZERO_ALLOC;

	case ttm_bo_type_kernel:

		bo->ttm = bdev->driver->ttm_tt_create(bdev, bo->num_pages << PAGE_SHIFT,

						      page_flags, glob->dummy_read_page);

		if (unlikely(bo->ttm == NULL))

			ret = -ENOMEM;

		break;

	case ttm_bo_type_sg:

		bo->ttm = bdev->driver->ttm_tt_create(bdev, bo->num_pages << PAGE_SHIFT,

						      page_flags | TTM_PAGE_FLAG_SG,

						      glob->dummy_read_page);

		if (unlikely(bo->ttm == NULL)) {

			ret = -ENOMEM;

			break;

		}

		bo->ttm->sg = bo->sg;

		break;

	default:

		pr_err("Illegal buffer object type\n");

		ret = -EINVAL;

		break;

	}

	return ret;

}

#if 0

static int ttm_bo_handle_move_mem(struct ttm_buffer_object *bo,

				  struct ttm_mem_reg *mem,

				  bool evict, bool interruptible,

				  bool no_wait_gpu)

{

	struct ttm_bo_device *bdev = bo->bdev;

	bool old_is_pci = ttm_mem_reg_is_pci(bdev, &bo->mem);

	bool new_is_pci = ttm_mem_reg_is_pci(bdev, mem);

	struct ttm_mem_type_manager *old_man = &bdev->man[bo->mem.mem_type];

	struct ttm_mem_type_manager *new_man = &bdev->man[mem->mem_type];

	int ret = 0;

	if (old_is_pci || new_is_pci ||

	    ((mem->placement & bo->mem.placement & TTM_PL_MASK_CACHING) == 0)) {

		ret = ttm_mem_io_lock(old_man, true);

		if (unlikely(ret != 0))

			goto out_err;

		ttm_bo_unmap_virtual_locked(bo);

		ttm_mem_io_unlock(old_man);

	}

	/*

	 * Create and bind a ttm if required.

	 */

	if (!(new_man->flags & TTM_MEMTYPE_FLAG_FIXED)) {

		if (bo->ttm == NULL) {

			bool zero = !(old_man->flags & TTM_MEMTYPE_FLAG_FIXED);

			ret = ttm_bo_add_ttm(bo, zero);

			if (ret)

				goto out_err;

		}

		ret = ttm_tt_set_placement_caching(bo->ttm, mem->placement);

		if (ret)

			goto out_err;

		if (mem->mem_type != TTM_PL_SYSTEM) {

			ret = ttm_tt_bind(bo->ttm, mem);

			if (ret)

				goto out_err;

		}

		if (bo->mem.mem_type == TTM_PL_SYSTEM) {

			if (bdev->driver->move_notify)

				bdev->driver->move_notify(bo, mem);

			bo->mem = *mem;

			mem->mm_node = NULL;

			goto moved;

		}

	}

	if (bdev->driver->move_notify)

		bdev->driver->move_notify(bo, mem);

	if (!(old_man->flags & TTM_MEMTYPE_FLAG_FIXED) &&

	    !(new_man->flags & TTM_MEMTYPE_FLAG_FIXED))

		ret = ttm_bo_move_ttm(bo, evict, no_wait_gpu, mem);

	else if (bdev->driver->move)

		ret = bdev->driver->move(bo, evict, interruptible,

					 no_wait_gpu, mem);

	else

		ret = ttm_bo_move_memcpy(bo, evict, no_wait_gpu, mem);

	if (ret) {

		if (bdev->driver->move_notify) {

			struct ttm_mem_reg tmp_mem = *mem;

			*mem = bo->mem;

			bo->mem = tmp_mem;

			bdev->driver->move_notify(bo, mem);

			bo->mem = *mem;

			*mem = tmp_mem;

		}

		goto out_err;

	}

moved:

	if (bo->evicted) {

		ret = bdev->driver->invalidate_caches(bdev, bo->mem.placement);

		if (ret)

			pr_err("Can not flush read caches\n");

		bo->evicted = false;

	}

	if (bo->mem.mm_node) {

		bo->offset = (bo->mem.start << PAGE_SHIFT) +

		    bdev->man[bo->mem.mem_type].gpu_offset;

		bo->cur_placement = bo->mem.placement;

	} else

		bo->offset = 0;

	return 0;

out_err:

	new_man = &bdev->man[bo->mem.mem_type];

	if ((new_man->flags & TTM_MEMTYPE_FLAG_FIXED) && bo->ttm) {

		ttm_tt_unbind(bo->ttm);

		ttm_tt_destroy(bo->ttm);

		bo->ttm = NULL;

	}

	return ret;

}

/**

 * Call bo::reserved.

 * Will release GPU memory type usage on destruction.

 * This is the place to put in driver specific hooks to release

 * driver private resources.

 * Will release the bo::reserved lock.

 */

static void ttm_bo_cleanup_memtype_use(struct ttm_buffer_object *bo)

{

	if (bo->bdev->driver->move_notify)

		bo->bdev->driver->move_notify(bo, NULL);

	if (bo->ttm) {

		ttm_tt_unbind(bo->ttm);

		ttm_tt_destroy(bo->ttm);

		bo->ttm = NULL;

	}

	ttm_bo_mem_put(bo, &bo->mem);

	ww_mutex_unlock (&bo->resv->lock);

}

static void ttm_bo_cleanup_refs_or_queue(struct ttm_buffer_object *bo)

{

	struct ttm_bo_device *bdev = bo->bdev;

	struct ttm_bo_global *glob = bo->glob;

	struct ttm_bo_driver *driver = bdev->driver;

	void *sync_obj = NULL;

	int put_count;

	int ret;

	spin_lock(&glob->lru_lock);

	ret = ttm_bo_reserve_nolru(bo, false, true, false, 0);

	spin_lock(&bdev->fence_lock);

	(void) ttm_bo_wait(bo, false, false, true);

	if (!ret && !bo->sync_obj) {

		spin_unlock(&bdev->fence_lock);

		put_count = ttm_bo_del_from_lru(bo);

		spin_unlock(&glob->lru_lock);

		ttm_bo_cleanup_memtype_use(bo);

		ttm_bo_list_ref_sub(bo, put_count, true);

		return;

	}

	if (bo->sync_obj)

		sync_obj = driver->sync_obj_ref(bo->sync_obj);

	spin_unlock(&bdev->fence_lock);

	if (!ret) {

		/*

		 * Make NO_EVICT bos immediately available to

		 * shrinkers, now that they are queued for

		 * destruction.

		 */

		if (bo->mem.placement & TTM_PL_FLAG_NO_EVICT) {

			bo->mem.placement &= ~TTM_PL_FLAG_NO_EVICT;

			ttm_bo_add_to_lru(bo);

		}

		ww_mutex_unlock(&bo->resv->lock);

	}

	kref_get(&bo->list_kref);

	list_add_tail(&bo->ddestroy, &bdev->ddestroy);

	spin_unlock(&glob->lru_lock);

	if (sync_obj) {

		driver->sync_obj_flush(sync_obj);

		driver->sync_obj_unref(&sync_obj);

	}

	schedule_delayed_work(&bdev->wq,

			      ((HZ / 100) < 1) ? 1 : HZ / 100);

}

/**

 * function ttm_bo_cleanup_refs_and_unlock

 * If bo idle, remove from delayed- and lru lists, and unref.

 * If not idle, do nothing.

 *

 * Must be called with lru_lock and reservation held, this function

 * will drop both before returning.

 *

 * @interruptible         Any sleeps should occur interruptibly.

 * @no_wait_gpu           Never wait for gpu. Return -EBUSY instead.

 */

static int ttm_bo_cleanup_refs_and_unlock(struct ttm_buffer_object *bo,

					  bool interruptible,

					  bool no_wait_gpu)

{

	struct ttm_bo_device *bdev = bo->bdev;

	struct ttm_bo_driver *driver = bdev->driver;

	struct ttm_bo_global *glob = bo->glob;

	int put_count;

	int ret;

	spin_lock(&bdev->fence_lock);

	ret = ttm_bo_wait(bo, false, false, true);

	if (ret && !no_wait_gpu) {

		void *sync_obj;

		/*

		 * Take a reference to the fence and unreserve,

		 * at this point the buffer should be dead, so

		 * no new sync objects can be attached.

		 */

		sync_obj = driver->sync_obj_ref(bo->sync_obj);

		spin_unlock(&bdev->fence_lock);

		ww_mutex_unlock(&bo->resv->lock);

		spin_unlock(&glob->lru_lock);

		ret = driver->sync_obj_wait(sync_obj, false, interruptible);

		driver->sync_obj_unref(&sync_obj);

		if (ret)

			return ret;

		/*

		 * remove sync_obj with ttm_bo_wait, the wait should be

		 * finished, and no new wait object should have been added.

		 */

		spin_lock(&bdev->fence_lock);

		ret = ttm_bo_wait(bo, false, false, true);

		WARN_ON(ret);

		spin_unlock(&bdev->fence_lock);

		if (ret)

			return ret;

		spin_lock(&glob->lru_lock);

		ret = ttm_bo_reserve_nolru(bo, false, true, false, 0);

		/*

		 * We raced, and lost, someone else holds the reservation now,

		 * and is probably busy in ttm_bo_cleanup_memtype_use.

		 *

		 * Even if it's not the case, because we finished waiting any

		 * delayed destruction would succeed, so just return success

		 * here.

		 */

		if (ret) {

			spin_unlock(&glob->lru_lock);

			return 0;

		}

	} else

		spin_unlock(&bdev->fence_lock);

	if (ret || unlikely(list_empty(&bo->ddestroy))) {

		ww_mutex_unlock(&bo->resv->lock);

		spin_unlock(&glob->lru_lock);

		return ret;

	}

	put_count = ttm_bo_del_from_lru(bo);

	list_del_init(&bo->ddestroy);

	++put_count;

	spin_unlock(&glob->lru_lock);

	ttm_bo_cleanup_memtype_use(bo);

	ttm_bo_list_ref_sub(bo, put_count, true);

	return 0;

}

/**

 * Traverse the delayed list, and call ttm_bo_cleanup_refs on all

 * encountered buffers.

 */

static int ttm_bo_delayed_delete(struct ttm_bo_device *bdev, bool remove_all)

{

	struct ttm_bo_global *glob = bdev->glob;

	struct ttm_buffer_object *entry = NULL;

	int ret = 0;

	spin_lock(&glob->lru_lock);

	if (list_empty(&bdev->ddestroy))

		goto out_unlock;

	entry = list_first_entry(&bdev->ddestroy,

		struct ttm_buffer_object, ddestroy);

	kref_get(&entry->list_kref);

	for (;;) {

		struct ttm_buffer_object *nentry = NULL;

		if (entry->ddestroy.next != &bdev->ddestroy) {

			nentry = list_first_entry(&entry->ddestroy,

				struct ttm_buffer_object, ddestroy);

			kref_get(&nentry->list_kref);

		}

		ret = ttm_bo_reserve_nolru(entry, false, true, false, 0);

		if (remove_all && ret) {

			spin_unlock(&glob->lru_lock);

			ret = ttm_bo_reserve_nolru(entry, false, false,

						   false, 0);

			spin_lock(&glob->lru_lock);

		}

		if (!ret)

			ret = ttm_bo_cleanup_refs_and_unlock(entry, false,

							     !remove_all);

		else

			spin_unlock(&glob->lru_lock);

		kref_put(&entry->list_kref, ttm_bo_release_list);

		entry = nentry;

		if (ret || !entry)

			goto out;

		spin_lock(&glob->lru_lock);

		if (list_empty(&entry->ddestroy))

			break;

	}

out_unlock:

	spin_unlock(&glob->lru_lock);

out:

	if (entry)

		kref_put(&entry->list_kref, ttm_bo_release_list);

	return ret;

}

static void ttm_bo_delayed_workqueue(struct work_struct *work)

{

	struct ttm_bo_device *bdev =

	    container_of(work, struct ttm_bo_device, wq.work);

	if (ttm_bo_delayed_delete(bdev, false)) {

		schedule_delayed_work(&bdev->wq,

				      ((HZ / 100) < 1) ? 1 : HZ / 100);

	}

}

#endif

static void ttm_bo_release(struct kref *kref)

{

	struct ttm_buffer_object *bo =

	    container_of(kref, struct ttm_buffer_object, kref);

	struct ttm_bo_device *bdev = bo->bdev;

	struct ttm_mem_type_manager *man = &bdev->man[bo->mem.mem_type];

	drm_vma_offset_remove(&bdev->vma_manager, &bo->vma_node);

	ttm_mem_io_lock(man, false);

//   ttm_mem_io_free_vm(bo);

	ttm_mem_io_unlock(man);

//   ttm_bo_cleanup_refs_or_queue(bo);

//   kref_put(&bo->list_kref, ttm_bo_release_list);

}

void ttm_bo_unref(struct ttm_buffer_object **p_bo)

{

	struct ttm_buffer_object *bo = *p_bo;

	*p_bo = NULL;

	kref_put(&bo->kref, ttm_bo_release);

}

EXPORT_SYMBOL(ttm_bo_unref);

#if 0

int ttm_bo_lock_delayed_workqueue(struct ttm_bo_device *bdev)

{

	return cancel_delayed_work_sync(&bdev->wq);

}

EXPORT_SYMBOL(ttm_bo_lock_delayed_workqueue);

void ttm_bo_unlock_delayed_workqueue(struct ttm_bo_device *bdev, int resched)

{

	if (resched)

		schedule_delayed_work(&bdev->wq,

				      ((HZ / 100) < 1) ? 1 : HZ / 100);

}

EXPORT_SYMBOL(ttm_bo_unlock_delayed_workqueue);

static int ttm_bo_evict(struct ttm_buffer_object *bo, bool interruptible,

			bool no_wait_gpu)

{

	struct ttm_bo_device *bdev = bo->bdev;

	struct ttm_mem_reg evict_mem;

	struct ttm_placement placement;

	int ret = 0;

	spin_lock(&bdev->fence_lock);

	ret = ttm_bo_wait(bo, false, interruptible, no_wait_gpu);

	spin_unlock(&bdev->fence_lock);

	if (unlikely(ret != 0)) {

		if (ret != -ERESTARTSYS) {

			pr_err("Failed to expire sync object before buffer eviction\n");

		}

		goto out;

	}

//	BUG_ON(!ttm_bo_is_reserved(bo));

	evict_mem = bo->mem;

	evict_mem.mm_node = NULL;

	evict_mem.bus.io_reserved_vm = false;

	evict_mem.bus.io_reserved_count = 0;

	placement.fpfn = 0;

	placement.lpfn = 0;

	placement.num_placement = 0;

	placement.num_busy_placement = 0;

	bdev->driver->evict_flags(bo, &placement);

	ret = ttm_bo_mem_space(bo, &placement, &evict_mem, interruptible,

				no_wait_gpu);

	if (ret) {

		if (ret != -ERESTARTSYS) {

			pr_err("Failed to find memory space for buffer 0x%p eviction\n",

			       bo);

			ttm_bo_mem_space_debug(bo, &placement);

		}

		goto out;

	}

	ret = ttm_bo_handle_move_mem(bo, &evict_mem, true, interruptible,

				     no_wait_gpu);

	if (ret) {

		if (ret != -ERESTARTSYS)

			pr_err("Buffer eviction failed\n");

		ttm_bo_mem_put(bo, &evict_mem);

		goto out;

	}

	bo->evicted = true;

out:

	return ret;

}

static int ttm_mem_evict_first(struct ttm_bo_device *bdev,

				uint32_t mem_type,

				bool interruptible,

				bool no_wait_gpu)

{

	struct ttm_bo_global *glob = bdev->glob;

	struct ttm_mem_type_manager *man = &bdev->man[mem_type];

	struct ttm_buffer_object *bo;

	int ret = -EBUSY, put_count;

	spin_lock(&glob->lru_lock);

	list_for_each_entry(bo, &man->lru, lru) {

		ret = ttm_bo_reserve_nolru(bo, false, true, false, 0);

		if (!ret)

			break;

	}

	if (ret) {

		spin_unlock(&glob->lru_lock);

		return ret;

	}

	kref_get(&bo->list_kref);

	if (!list_empty(&bo->ddestroy)) {

		ret = ttm_bo_cleanup_refs_and_unlock(bo, interruptible,

						     no_wait_gpu);

		kref_put(&bo->list_kref, ttm_bo_release_list);

		return ret;

	}

	put_count = ttm_bo_del_from_lru(bo);

	spin_unlock(&glob->lru_lock);

	BUG_ON(ret != 0);

	ttm_bo_list_ref_sub(bo, put_count, true);

	ret = ttm_bo_evict(bo, interruptible, no_wait_gpu);

	ttm_bo_unreserve(bo);

	kref_put(&bo->list_kref, ttm_bo_release_list);

	return ret;

}

void ttm_bo_mem_put(struct ttm_buffer_object *bo, struct ttm_mem_reg *mem)

{

	struct ttm_mem_type_manager *man = &bo->bdev->man[mem->mem_type];

	if (mem->mm_node)

		(*man->func->put_node)(man, mem);

}

EXPORT_SYMBOL(ttm_bo_mem_put);

/**

 * Repeatedly evict memory from the LRU for @mem_type until we create enough

 * space, or we've evicted everything and there isn't enough space.

 */

static int ttm_bo_mem_force_space(struct ttm_buffer_object *bo,

					uint32_t mem_type,

					struct ttm_placement *placement,

					struct ttm_mem_reg *mem,

					bool interruptible,

					bool no_wait_gpu)

{

	struct ttm_bo_device *bdev = bo->bdev;

	struct ttm_mem_type_manager *man = &bdev->man[mem_type];

	int ret;

	do {

		ret = (*man->func->get_node)(man, bo, placement, mem);

		if (unlikely(ret != 0))

			return ret;

		if (mem->mm_node)

			break;

		ret = ttm_mem_evict_first(bdev, mem_type,

					  interruptible, no_wait_gpu);

		if (unlikely(ret != 0))

			return ret;

	} while (1);

	if (mem->mm_node == NULL)

		return -ENOMEM;

	mem->mem_type = mem_type;

	return 0;

}

static uint32_t ttm_bo_select_caching(struct ttm_mem_type_manager *man,

				      uint32_t cur_placement,

				      uint32_t proposed_placement)

{

	uint32_t caching = proposed_placement & TTM_PL_MASK_CACHING;

	uint32_t result = proposed_placement & ~TTM_PL_MASK_CACHING;

	/**

	 * Keep current caching if possible.

	 */

	if ((cur_placement & caching) != 0)

		result |= (cur_placement & caching);

	else if ((man->default_caching & caching) != 0)

		result |= man->default_caching;

	else if ((TTM_PL_FLAG_CACHED & caching) != 0)

		result |= TTM_PL_FLAG_CACHED;

	else if ((TTM_PL_FLAG_WC & caching) != 0)

		result |= TTM_PL_FLAG_WC;

	else if ((TTM_PL_FLAG_UNCACHED & caching) != 0)

		result |= TTM_PL_FLAG_UNCACHED;

	return result;

}

static bool ttm_bo_mt_compatible(struct ttm_mem_type_manager *man,

				 uint32_t mem_type,

				 uint32_t proposed_placement,

				 uint32_t *masked_placement)

{

	uint32_t cur_flags = ttm_bo_type_flags(mem_type);

	if ((cur_flags & proposed_placement & TTM_PL_MASK_MEM) == 0)

		return false;

	if ((proposed_placement & man->available_caching) == 0)

		return false;

	cur_flags |= (proposed_placement & man->available_caching);

	*masked_placement = cur_flags;

	return true;

}

/**

 * Creates space for memory region @mem according to its type.

 *

 * This function first searches for free space in compatible memory types in

 * the priority order defined by the driver.  If free space isn't found, then

 * ttm_bo_mem_force_space is attempted in priority order to evict and find

 * space.

 */

int ttm_bo_mem_space(struct ttm_buffer_object *bo,

			struct ttm_placement *placement,

			struct ttm_mem_reg *mem,

			bool interruptible,

			bool no_wait_gpu)

{

	struct ttm_bo_device *bdev = bo->bdev;

	struct ttm_mem_type_manager *man;

	uint32_t mem_type = TTM_PL_SYSTEM;

	uint32_t cur_flags = 0;

	bool type_found = false;

	bool type_ok = false;

	bool has_erestartsys = false;

	int i, ret;

	mem->mm_node = NULL;

	for (i = 0; i < placement->num_placement; ++i) {

		ret = ttm_mem_type_from_flags(placement->placement[i],

						&mem_type);

		if (ret)

			return ret;

		man = &bdev->man[mem_type];

		type_ok = ttm_bo_mt_compatible(man,

						mem_type,

						placement->placement[i],

						&cur_flags);

		if (!type_ok)

			continue;

		cur_flags = ttm_bo_select_caching(man, bo->mem.placement,

						  cur_flags);

		/*

		 * Use the access and other non-mapping-related flag bits from

		 * the memory placement flags to the current flags

		 */

		ttm_flag_masked(&cur_flags, placement->placement[i],

				~TTM_PL_MASK_MEMTYPE);

		if (mem_type == TTM_PL_SYSTEM)

			break;

		if (man->has_type && man->use_type) {

			type_found = true;

			ret = (*man->func->get_node)(man, bo, placement, mem);

			if (unlikely(ret))

				return ret;

		}

		if (mem->mm_node)

			break;

	}

	if ((type_ok && (mem_type == TTM_PL_SYSTEM)) || mem->mm_node) {

		mem->mem_type = mem_type;

		mem->placement = cur_flags;

		return 0;

	}

	if (!type_found)

		return -EINVAL;

	for (i = 0; i < placement->num_busy_placement; ++i) {

		ret = ttm_mem_type_from_flags(placement->busy_placement[i],

						&mem_type);

		if (ret)

			return ret;

		man = &bdev->man[mem_type];

		if (!man->has_type)

			continue;

		if (!ttm_bo_mt_compatible(man,

						mem_type,

						placement->busy_placement[i],

						&cur_flags))

			continue;

		cur_flags = ttm_bo_select_caching(man, bo->mem.placement,

						  cur_flags);

		/*

		 * Use the access and other non-mapping-related flag bits from

		 * the memory placement flags to the current flags

		 */

		ttm_flag_masked(&cur_flags, placement->busy_placement[i],

				~TTM_PL_MASK_MEMTYPE);

		if (mem_type == TTM_PL_SYSTEM) {

			mem->mem_type = mem_type;

			mem->placement = cur_flags;

			mem->mm_node = NULL;

			return 0;

		}

		ret = ttm_bo_mem_force_space(bo, mem_type, placement, mem,

						interruptible, no_wait_gpu);

		if (ret == 0 && mem->mm_node) {

			mem->placement = cur_flags;

			return 0;

		}

		if (ret == -ERESTARTSYS)

			has_erestartsys = true;

	}

	ret = (has_erestartsys) ? -ERESTARTSYS : -ENOMEM;

	return ret;

}

EXPORT_SYMBOL(ttm_bo_mem_space);

static int ttm_bo_move_buffer(struct ttm_buffer_object *bo,

			struct ttm_placement *placement,

			bool interruptible,

			bool no_wait_gpu)

{

	int ret = 0;

	struct ttm_mem_reg mem;

	struct ttm_bo_device *bdev = bo->bdev;

//	BUG_ON(!ttm_bo_is_reserved(bo));

	/*

	 * FIXME: It's possible to pipeline buffer moves.

	 * Have the driver move function wait for idle when necessary,

	 * instead of doing it here.

	 */

	spin_lock(&bdev->fence_lock);

	ret = ttm_bo_wait(bo, false, interruptible, no_wait_gpu);

	spin_unlock(&bdev->fence_lock);

	if (ret)

		return ret;

	mem.num_pages = bo->num_pages;

	mem.size = mem.num_pages << PAGE_SHIFT;

	mem.page_alignment = bo->mem.page_alignment;

	mem.bus.io_reserved_vm = false;

	mem.bus.io_reserved_count = 0;

	/*

	 * Determine where to move the buffer.

	 */

	ret = ttm_bo_mem_space(bo, placement, &mem,

			       interruptible, no_wait_gpu);

	if (ret)

		goto out_unlock;

	ret = ttm_bo_handle_move_mem(bo, &mem, false,

				     interruptible, no_wait_gpu);

out_unlock:

	if (ret && mem.mm_node)

		ttm_bo_mem_put(bo, &mem);

	return ret;

}

#endif

static bool ttm_bo_mem_compat(struct ttm_placement *placement,

			      struct ttm_mem_reg *mem,

			      uint32_t *new_flags)

{

	int i;

	if (mem->mm_node && placement->lpfn != 0 &&

	    (mem->start < placement->fpfn ||

	     mem->start + mem->num_pages > placement->lpfn))

		return false;

	for (i = 0; i < placement->num_placement; i++) {

		*new_flags = placement->placement[i];

		if ((*new_flags & mem->placement & TTM_PL_MASK_CACHING) &&

		    (*new_flags & mem->placement & TTM_PL_MASK_MEM))

			return true;

	}

	for (i = 0; i < placement->num_busy_placement; i++) {

		*new_flags = placement->busy_placement[i];

		if ((*new_flags & mem->placement & TTM_PL_MASK_CACHING) &&

		    (*new_flags & mem->placement & TTM_PL_MASK_MEM))

			return true;

	}

	return false;

}

int ttm_bo_validate(struct ttm_buffer_object *bo,

			struct ttm_placement *placement,

			bool interruptible,

			bool no_wait_gpu)

{

	int ret;

	uint32_t new_flags;

//	BUG_ON(!ttm_bo_is_reserved(bo));

	/* Check that range is valid */

	if (placement->lpfn || placement->fpfn)

		if (placement->fpfn > placement->lpfn ||

			(placement->lpfn - placement->fpfn) < bo->num_pages)

			return -EINVAL;

	/*

	 * Check whether we need to move buffer.

	 */

	if (!ttm_bo_mem_compat(placement, &bo->mem, &new_flags)) {

//       ret = ttm_bo_move_buffer(bo, placement, interruptible,

//                    no_wait_gpu);

		if (ret)

			return ret;

	} else {

		/*

		 * Use the access and other non-mapping-related flag bits from

		 * the compatible memory placement flags to the active flags

		 */

		ttm_flag_masked(&bo->mem.placement, new_flags,

				~TTM_PL_MASK_MEMTYPE);

	}

	/*

	 * We might need to add a TTM.

	 */

	if (bo->mem.mem_type == TTM_PL_SYSTEM && bo->ttm == NULL) {

		ret = ttm_bo_add_ttm(bo, true);

		if (ret)

			return ret;

	}

	return 0;

}

EXPORT_SYMBOL(ttm_bo_validate);

int ttm_bo_check_placement(struct ttm_buffer_object *bo,

				struct ttm_placement *placement)

{

	BUG_ON((placement->fpfn || placement->lpfn) &&

	       (bo->mem.num_pages > (placement->lpfn - placement->fpfn)));

	return 0;

}

int ttm_bo_init(struct ttm_bo_device *bdev,

		struct ttm_buffer_object *bo,

		unsigned long size,

		enum ttm_bo_type type,

		struct ttm_placement *placement,

		uint32_t page_alignment,

		bool interruptible,

		struct file *persistent_swap_storage,

		size_t acc_size,

		struct sg_table *sg,

		void (*destroy) (struct ttm_buffer_object *))

{

	int ret = 0;

	unsigned long num_pages;

	struct ttm_mem_global *mem_glob = bdev->glob->mem_glob;

	bool locked;

//   ret = ttm_mem_global_alloc(mem_glob, acc_size, false, false);

	if (ret) {

		pr_err("Out of kernel memory\n");

		if (destroy)

			(*destroy)(bo);

		else

			kfree(bo);

		return -ENOMEM;

	}

	num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;

	if (num_pages == 0) {

		pr_err("Illegal buffer object size\n");

		if (destroy)

			(*destroy)(bo);

		else

			kfree(bo);

//       ttm_mem_global_free(mem_glob, acc_size);

		return -EINVAL;

	}

	bo->destroy = destroy;

	kref_init(&bo->kref);

	kref_init(&bo->list_kref);

	atomic_set(&bo->cpu_writers, 0);

	INIT_LIST_HEAD(&bo->lru);