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

 *

 * Copyright (c) 2007-2009 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 

 */

#include 

#include 

#include 

#include 

#include 

#include 

#include 

#include 

#include 

void ttm_bo_free_old_node(struct ttm_buffer_object *bo)

{

	ttm_bo_mem_put(bo, &bo->mem);

}

int ttm_bo_move_ttm(struct ttm_buffer_object *bo,

		    bool evict,

		    bool no_wait_gpu, struct ttm_mem_reg *new_mem)

{

	struct ttm_tt *ttm = bo->ttm;

	struct ttm_mem_reg *old_mem = &bo->mem;

	int ret;

	if (old_mem->mem_type != TTM_PL_SYSTEM) {

		ttm_tt_unbind(ttm);

		ttm_bo_free_old_node(bo);

		ttm_flag_masked(&old_mem->placement, TTM_PL_FLAG_SYSTEM,

				TTM_PL_MASK_MEM);

		old_mem->mem_type = TTM_PL_SYSTEM;

	}

	ret = ttm_tt_set_placement_caching(ttm, new_mem->placement);

	if (unlikely(ret != 0))

		return ret;

	if (new_mem->mem_type != TTM_PL_SYSTEM) {

		ret = ttm_tt_bind(ttm, new_mem);

		if (unlikely(ret != 0))

			return ret;

	}

	*old_mem = *new_mem;

	new_mem->mm_node = NULL;

	return 0;

}

EXPORT_SYMBOL(ttm_bo_move_ttm);

int ttm_mem_io_lock(struct ttm_mem_type_manager *man, bool interruptible)

{

	if (likely(man->io_reserve_fastpath))

		return 0;

	if (interruptible)

		return mutex_lock_interruptible(&man->io_reserve_mutex);

	mutex_lock(&man->io_reserve_mutex);

	return 0;

}

EXPORT_SYMBOL(ttm_mem_io_lock);

void ttm_mem_io_unlock(struct ttm_mem_type_manager *man)

{

	if (likely(man->io_reserve_fastpath))

		return;

	mutex_unlock(&man->io_reserve_mutex);

}

EXPORT_SYMBOL(ttm_mem_io_unlock);

static int ttm_mem_io_evict(struct ttm_mem_type_manager *man)

{

	struct ttm_buffer_object *bo;

	if (!man->use_io_reserve_lru || list_empty(&man->io_reserve_lru))

		return -EAGAIN;

	bo = list_first_entry(&man->io_reserve_lru,

			      struct ttm_buffer_object,

			      io_reserve_lru);

	list_del_init(&bo->io_reserve_lru);

	ttm_bo_unmap_virtual_locked(bo);

	return 0;

}

int ttm_mem_io_reserve(struct ttm_bo_device *bdev,

		       struct ttm_mem_reg *mem)

{

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

	int ret = 0;

	if (!bdev->driver->io_mem_reserve)

		return 0;

	if (likely(man->io_reserve_fastpath))

		return bdev->driver->io_mem_reserve(bdev, mem);

	if (bdev->driver->io_mem_reserve &&

	    mem->bus.io_reserved_count++ == 0) {

retry:

		ret = bdev->driver->io_mem_reserve(bdev, mem);

		if (ret == -EAGAIN) {

			ret = ttm_mem_io_evict(man);

			if (ret == 0)

				goto retry;

		}

	}

	return ret;

}

EXPORT_SYMBOL(ttm_mem_io_reserve);

void ttm_mem_io_free(struct ttm_bo_device *bdev,

		     struct ttm_mem_reg *mem)

{

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

	if (likely(man->io_reserve_fastpath))

		return;

	if (bdev->driver->io_mem_reserve &&

	    --mem->bus.io_reserved_count == 0 &&

	    bdev->driver->io_mem_free)

		bdev->driver->io_mem_free(bdev, mem);

}

EXPORT_SYMBOL(ttm_mem_io_free);

int ttm_mem_io_reserve_vm(struct ttm_buffer_object *bo)

{

	struct ttm_mem_reg *mem = &bo->mem;

	int ret;

	if (!mem->bus.io_reserved_vm) {

		struct ttm_mem_type_manager *man =

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

		ret = ttm_mem_io_reserve(bo->bdev, mem);

		if (unlikely(ret != 0))

			return ret;

		mem->bus.io_reserved_vm = true;

		if (man->use_io_reserve_lru)

			list_add_tail(&bo->io_reserve_lru,

				      &man->io_reserve_lru);

	}

	return 0;

}

void ttm_mem_io_free_vm(struct ttm_buffer_object *bo)

{

	struct ttm_mem_reg *mem = &bo->mem;

	if (mem->bus.io_reserved_vm) {

		mem->bus.io_reserved_vm = false;

		list_del_init(&bo->io_reserve_lru);

		ttm_mem_io_free(bo->bdev, mem);

	}

}

static int ttm_mem_reg_ioremap(struct ttm_bo_device *bdev, struct ttm_mem_reg *mem,

			void **virtual)

{

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

	int ret;

	void *addr;

	*virtual = NULL;

	(void) ttm_mem_io_lock(man, false);

	ret = ttm_mem_io_reserve(bdev, mem);

	ttm_mem_io_unlock(man);

	if (ret || !mem->bus.is_iomem)

		return ret;

	if (mem->bus.addr) {

		addr = mem->bus.addr;

	} else {

		if (mem->placement & TTM_PL_FLAG_WC)

			addr = ioremap_wc(mem->bus.base + mem->bus.offset, mem->bus.size);

		else

			addr = ioremap_nocache(mem->bus.base + mem->bus.offset, mem->bus.size);

		if (!addr) {

			(void) ttm_mem_io_lock(man, false);

			ttm_mem_io_free(bdev, mem);

			ttm_mem_io_unlock(man);

			return -ENOMEM;

		}

	}

	*virtual = addr;

	return 0;

}

static void ttm_mem_reg_iounmap(struct ttm_bo_device *bdev, struct ttm_mem_reg *mem,

			 void *virtual)

{

	struct ttm_mem_type_manager *man;

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

	if (virtual && mem->bus.addr == NULL)

		iounmap(virtual);

	(void) ttm_mem_io_lock(man, false);

	ttm_mem_io_free(bdev, mem);

	ttm_mem_io_unlock(man);

}

static int ttm_copy_io_page(void *dst, void *src, unsigned long page)

{

	uint32_t *dstP =

	    (uint32_t *) ((unsigned long)dst + (page << PAGE_SHIFT));

	uint32_t *srcP =

	    (uint32_t *) ((unsigned long)src + (page << PAGE_SHIFT));

	int i;

	for (i = 0; i < PAGE_SIZE / sizeof(uint32_t); ++i)

		iowrite32(ioread32(srcP++), dstP++);

	return 0;

}

static int ttm_copy_io_ttm_page(struct ttm_tt *ttm, void *src,

				unsigned long page,

				pgprot_t prot)

{

	struct page *d = ttm->pages[page];

	void *dst;

	if (!d)

		return -ENOMEM;

	src = (void *)((unsigned long)src + (page << PAGE_SHIFT));

#ifdef CONFIG_X86

	dst = kmap_atomic_prot(d, prot);

#else

	if (pgprot_val(prot) != pgprot_val(PAGE_KERNEL))

		dst = vmap(&d, 1, 0, prot);

	else

		dst = kmap(d);

#endif

	if (!dst)

		return -ENOMEM;

	memcpy_fromio(dst, src, PAGE_SIZE);

#ifdef CONFIG_X86

	kunmap_atomic(dst);

#else

	if (pgprot_val(prot) != pgprot_val(PAGE_KERNEL))

		vunmap(dst);

	else

		kunmap(d);

#endif

	return 0;

}

static int ttm_copy_ttm_io_page(struct ttm_tt *ttm, void *dst,

				unsigned long page,

				pgprot_t prot)

{

	struct page *s = ttm->pages[page];

	void *src;

	if (!s)

		return -ENOMEM;

	dst = (void *)((unsigned long)dst + (page << PAGE_SHIFT));

#ifdef CONFIG_X86

	src = kmap_atomic_prot(s, prot);

#else

	if (pgprot_val(prot) != pgprot_val(PAGE_KERNEL))

		src = vmap(&s, 1, 0, prot);

	else

		src = kmap(s);

#endif

	if (!src)

		return -ENOMEM;

	memcpy_toio(dst, src, PAGE_SIZE);

#ifdef CONFIG_X86

	kunmap_atomic(src);

#else

	if (pgprot_val(prot) != pgprot_val(PAGE_KERNEL))

		vunmap(src);

	else

		kunmap(s);

#endif

	return 0;

}

int ttm_bo_move_memcpy(struct ttm_buffer_object *bo,

		       bool evict, bool no_wait_gpu,

		       struct ttm_mem_reg *new_mem)

{

	struct ttm_bo_device *bdev = bo->bdev;

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

	struct ttm_tt *ttm = bo->ttm;

	struct ttm_mem_reg *old_mem = &bo->mem;

	struct ttm_mem_reg old_copy = *old_mem;

	void *old_iomap;

	void *new_iomap;

	int ret;

	unsigned long i;

	unsigned long page;

	unsigned long add = 0;

	int dir;

	ret = ttm_mem_reg_ioremap(bdev, old_mem, &old_iomap);

	if (ret)

		return ret;

	ret = ttm_mem_reg_ioremap(bdev, new_mem, &new_iomap);

	if (ret)

		goto out;

	/*

	 * Single TTM move. NOP.

	 */

	if (old_iomap == NULL && new_iomap == NULL)

		goto out2;

	/*

	 * Don't move nonexistent data. Clear destination instead.

	 */

	if (old_iomap == NULL && ttm == NULL)

		goto out2;

	/*

	 * TTM might be null for moves within the same region.

	 */

	if (ttm && ttm->state == tt_unpopulated) {

		ret = ttm->bdev->driver->ttm_tt_populate(ttm);

		if (ret)

			goto out1;

		}

	add = 0;

	dir = 1;

	if ((old_mem->mem_type == new_mem->mem_type) &&

	    (new_mem->start < old_mem->start + old_mem->size)) {

		dir = -1;

		add = new_mem->num_pages - 1;

	}

	for (i = 0; i < new_mem->num_pages; ++i) {

		page = i * dir + add;

		if (old_iomap == NULL) {

			pgprot_t prot = ttm_io_prot(old_mem->placement,

						    PAGE_KERNEL);

			ret = ttm_copy_ttm_io_page(ttm, new_iomap, page,

						   prot);

		} else if (new_iomap == NULL) {

			pgprot_t prot = ttm_io_prot(new_mem->placement,

						    PAGE_KERNEL);

			ret = ttm_copy_io_ttm_page(ttm, old_iomap, page,

						   prot);

		} else

			ret = ttm_copy_io_page(new_iomap, old_iomap, page);

		if (ret)

			goto out1;

		}

	mb();

out2:

	old_copy = *old_mem;

	*old_mem = *new_mem;

	new_mem->mm_node = NULL;

	if ((man->flags & TTM_MEMTYPE_FLAG_FIXED) && (ttm != NULL)) {

		ttm_tt_unbind(ttm);

		ttm_tt_destroy(ttm);

		bo->ttm = NULL;

	}

out1:

	ttm_mem_reg_iounmap(bdev, old_mem, new_iomap);

out:

	ttm_mem_reg_iounmap(bdev, &old_copy, old_iomap);

	/*

	 * On error, keep the mm node!

	 */

	if (!ret)

	ttm_bo_mem_put(bo, &old_copy);

	return ret;

}

EXPORT_SYMBOL(ttm_bo_move_memcpy);

static void ttm_transfered_destroy(struct ttm_buffer_object *bo)

{

	kfree(bo);

}

/**

 * ttm_buffer_object_transfer

 *

 * @bo: A pointer to a struct ttm_buffer_object.

 * @new_obj: A pointer to a pointer to a newly created ttm_buffer_object,

 * holding the data of @bo with the old placement.

 *

 * This is a utility function that may be called after an accelerated move

 * has been scheduled. A new buffer object is created as a placeholder for

 * the old data while it's being copied. When that buffer object is idle,

 * it can be destroyed, releasing the space of the old placement.

 * Returns:

 * !0: Failure.

 */

static int ttm_buffer_object_transfer(struct ttm_buffer_object *bo,

				      struct ttm_buffer_object **new_obj)

{

	struct ttm_buffer_object *fbo;

	struct ttm_bo_device *bdev = bo->bdev;

	struct ttm_bo_driver *driver = bdev->driver;

	int ret;

	fbo = kmalloc(sizeof(*fbo), GFP_KERNEL);

	if (!fbo)

		return -ENOMEM;

	*fbo = *bo;

	/**

	 * Fix up members that we shouldn't copy directly:

	 * TODO: Explicit member copy would probably be better here.

	 */

	INIT_LIST_HEAD(&fbo->ddestroy);

	INIT_LIST_HEAD(&fbo->lru);

	INIT_LIST_HEAD(&fbo->swap);

	INIT_LIST_HEAD(&fbo->io_reserve_lru);

	drm_vma_node_reset(&fbo->vma_node);

	atomic_set(&fbo->cpu_writers, 0);

	spin_lock(&bdev->fence_lock);

	if (bo->sync_obj)

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

	else

		fbo->sync_obj = NULL;

	spin_unlock(&bdev->fence_lock);

	kref_init(&fbo->list_kref);

	kref_init(&fbo->kref);

	fbo->destroy = &ttm_transfered_destroy;

	fbo->acc_size = 0;

	fbo->resv = &fbo->ttm_resv;

	reservation_object_init(fbo->resv);

	ret = ww_mutex_trylock(&fbo->resv->lock);

	WARN_ON(!ret);

	*new_obj = fbo;

	return 0;

}

pgprot_t ttm_io_prot(uint32_t caching_flags, pgprot_t tmp)

{

#if defined(__i386__) || defined(__x86_64__)

	if (caching_flags & TTM_PL_FLAG_WC)

		tmp = pgprot_writecombine(tmp);

	else if (boot_cpu_data.x86 > 3)

		tmp = pgprot_noncached(tmp);

#elif defined(__powerpc__)

	if (!(caching_flags & TTM_PL_FLAG_CACHED)) {

		pgprot_val(tmp) |= _PAGE_NO_CACHE;

		if (caching_flags & TTM_PL_FLAG_UNCACHED)

			pgprot_val(tmp) |= _PAGE_GUARDED;

	}

#endif

#if defined(__ia64__)

	if (caching_flags & TTM_PL_FLAG_WC)

		tmp = pgprot_writecombine(tmp);

	else

		tmp = pgprot_noncached(tmp);

#endif

#if defined(__sparc__) || defined(__mips__)

	if (!(caching_flags & TTM_PL_FLAG_CACHED))

		tmp = pgprot_noncached(tmp);

#endif

	return tmp;

}

EXPORT_SYMBOL(ttm_io_prot);

static int ttm_bo_ioremap(struct ttm_buffer_object *bo,

			  unsigned long offset,

			  unsigned long size,

			  struct ttm_bo_kmap_obj *map)

{

	struct ttm_mem_reg *mem = &bo->mem;

	if (bo->mem.bus.addr) {

		map->bo_kmap_type = ttm_bo_map_premapped;

		map->virtual = (void *)(((u8 *)bo->mem.bus.addr) + offset);

	} else {

		map->bo_kmap_type = ttm_bo_map_iomap;

		if (mem->placement & TTM_PL_FLAG_WC)

			map->virtual = ioremap_wc(bo->mem.bus.base + bo->mem.bus.offset + offset,

						  size);

		else

			map->virtual = ioremap_nocache(bo->mem.bus.base + bo->mem.bus.offset + offset,

						       size);

	}

	return (!map->virtual) ? -ENOMEM : 0;

}

static int ttm_bo_kmap_ttm(struct ttm_buffer_object *bo,

			   unsigned long start_page,

			   unsigned long num_pages,

			   struct ttm_bo_kmap_obj *map)

{

	struct ttm_mem_reg *mem = &bo->mem; pgprot_t prot;

	struct ttm_tt *ttm = bo->ttm;

	int ret;

	BUG_ON(!ttm);

	if (ttm->state == tt_unpopulated) {

		ret = ttm->bdev->driver->ttm_tt_populate(ttm);

		if (ret)

			return ret;

	}

	if (num_pages == 1 && (mem->placement & TTM_PL_FLAG_CACHED)) {

		/*

		 * We're mapping a single page, and the desired

		 * page protection is consistent with the bo.

		 */

		map->bo_kmap_type = ttm_bo_map_kmap;

		map->page = ttm->pages[start_page];

		map->virtual = kmap(map->page);

	} else {

		/*

		 * We need to use vmap to get the desired page protection

		 * or to make the buffer object look contiguous.

		 */

		prot = (mem->placement & TTM_PL_FLAG_CACHED) ?

			PAGE_KERNEL :

			ttm_io_prot(mem->placement, PAGE_KERNEL);

		map->bo_kmap_type = ttm_bo_map_vmap;

		map->virtual = vmap(ttm->pages + start_page, num_pages,

				    0, prot);

	}

	return (!map->virtual) ? -ENOMEM : 0;

}

int ttm_bo_kmap(struct ttm_buffer_object *bo,

		unsigned long start_page, unsigned long num_pages,

		struct ttm_bo_kmap_obj *map)

{

	struct ttm_mem_type_manager *man =

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

	unsigned long offset, size;

	int ret;

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

	map->virtual = NULL;

	map->bo = bo;

	if (num_pages > bo->num_pages)

		return -EINVAL;

	if (start_page > bo->num_pages)

		return -EINVAL;

#if 0

	if (num_pages > 1 && !capable(CAP_SYS_ADMIN))

		return -EPERM;

#endif

	(void) ttm_mem_io_lock(man, false);

	ret = ttm_mem_io_reserve(bo->bdev, &bo->mem);

	ttm_mem_io_unlock(man);

	if (ret)

		return ret;

	if (!bo->mem.bus.is_iomem) {

		return ttm_bo_kmap_ttm(bo, start_page, num_pages, map);

	} else {

		offset = start_page << PAGE_SHIFT;

		size = num_pages << PAGE_SHIFT;

		return ttm_bo_ioremap(bo, offset, size, map);

	}

}

EXPORT_SYMBOL(ttm_bo_kmap);

void ttm_bo_kunmap(struct ttm_bo_kmap_obj *map)

{

	struct ttm_buffer_object *bo = map->bo;

	struct ttm_mem_type_manager *man =

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

	if (!map->virtual)

		return;

	switch (map->bo_kmap_type) {

	case ttm_bo_map_iomap:

		iounmap(map->virtual);

		break;

	case ttm_bo_map_vmap:

		vunmap(map->virtual);

		break;

	case ttm_bo_map_kmap:

		kunmap(map->page);

		break;

	case ttm_bo_map_premapped:

		break;

	default:

		BUG();

	}

	(void) ttm_mem_io_lock(man, false);

	ttm_mem_io_free(map->bo->bdev, &map->bo->mem);

	ttm_mem_io_unlock(man);

	map->virtual = NULL;

	map->page = NULL;

}

EXPORT_SYMBOL(ttm_bo_kunmap);

int ttm_bo_move_accel_cleanup(struct ttm_buffer_object *bo,

			      void *sync_obj,

			      bool evict,

			      bool no_wait_gpu,

			      struct ttm_mem_reg *new_mem)

{

	struct ttm_bo_device *bdev = bo->bdev;

	struct ttm_bo_driver *driver = bdev->driver;

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

	struct ttm_mem_reg *old_mem = &bo->mem;

	int ret;

	struct ttm_buffer_object *ghost_obj;

	void *tmp_obj = NULL;

	spin_lock(&bdev->fence_lock);

	if (bo->sync_obj) {

		tmp_obj = bo->sync_obj;

		bo->sync_obj = NULL;

	}

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

	if (evict) {

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

		spin_unlock(&bdev->fence_lock);

		if (tmp_obj)

			driver->sync_obj_unref(&tmp_obj);

		if (ret)

			return ret;

		if ((man->flags & TTM_MEMTYPE_FLAG_FIXED) &&

		    (bo->ttm != NULL)) {

			ttm_tt_unbind(bo->ttm);

			ttm_tt_destroy(bo->ttm);

			bo->ttm = NULL;

		}

		ttm_bo_free_old_node(bo);

	} else {

		/**

		 * This should help pipeline ordinary buffer moves.

		 *

		 * Hang old buffer memory on a new buffer object,

		 * and leave it to be released when the GPU

		 * operation has completed.

		 */

		set_bit(TTM_BO_PRIV_FLAG_MOVING, &bo->priv_flags);

		spin_unlock(&bdev->fence_lock);

		if (tmp_obj)

			driver->sync_obj_unref(&tmp_obj);

		ret = ttm_buffer_object_transfer(bo, &ghost_obj);

		if (ret)

			return ret;

		/**

		 * If we're not moving to fixed memory, the TTM object

		 * needs to stay alive. Otherwhise hang it on the ghost

		 * bo to be unbound and destroyed.

		 */

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

			ghost_obj->ttm = NULL;

		else

			bo->ttm = NULL;

		ttm_bo_unreserve(ghost_obj);

		ttm_bo_unref(&ghost_obj);

	}

	*old_mem = *new_mem;

	new_mem->mm_node = NULL;

	return 0;

}

EXPORT_SYMBOL(ttm_bo_move_accel_cleanup);