[deliverable/linux.git] / drivers / gpu / drm / ttm / ttm_bo_util.c

/**************************************************************************
 *
 * 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 <thellstrom-at-vmware-dot-com>
 */

#include <drm/ttm/ttm_bo_driver.h>
#include <drm/ttm/ttm_placement.h>
#include <linux/io.h>
#include <linux/highmem.h>
#include <linux/wait.h>
#include <linux/slab.h>
#include <linux/vmalloc.h>
#include <linux/module.h>

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);
	}
}

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;
}

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;

	if (old_iomap == NULL && new_iomap == NULL)
		goto out2;
	if (old_iomap == NULL && ttm == NULL)
		goto out2;

	if (ttm->state == tt_unpopulated) {
		ret = ttm->bdev->driver->ttm_tt_populate(ttm);
		if (ret) {
			/* if we fail here don't nuke the mm node
			 * as the bo still owns it */
			old_copy.mm_node = NULL;
			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) {
			/* failing here, means keep old copy as-is */
			old_copy.mm_node = NULL;
			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);
	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;

	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_waitqueue_head(&fbo->event_queue);
	INIT_LIST_HEAD(&fbo->ddestroy);
	INIT_LIST_HEAD(&fbo->lru);
	INIT_LIST_HEAD(&fbo->swap);
	INIT_LIST_HEAD(&fbo->io_reserve_lru);
	fbo->vm_node = NULL;
	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;

	*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 && !DRM_SUSER(DRM_CURPROC))
		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);
Commit	Line	Data
ba4e7d97 TH	1	/**************************************************************************
	2	*
	3	* Copyright (c) 2007-2009 VMware, Inc., Palo Alto, CA., USA
	4	* All Rights Reserved.
	5	*
	6	* Permission is hereby granted, free of charge, to any person obtaining a
	7	* copy of this software and associated documentation files (the
	8	* "Software"), to deal in the Software without restriction, including
	9	* without limitation the rights to use, copy, modify, merge, publish,
	10	* distribute, sub license, and/or sell copies of the Software, and to
	11	* permit persons to whom the Software is furnished to do so, subject to
	12	* the following conditions:
	13	*
	14	* The above copyright notice and this permission notice (including the
	15	* next paragraph) shall be included in all copies or substantial portions
	16	* of the Software.
	17	*
	18	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	19	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	20	* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
	21	* THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
	22	* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
	23	* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
	24	* USE OR OTHER DEALINGS IN THE SOFTWARE.
	25	*
	26	**************************************************************************/
	27	/*
	28	* Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com>
	29	*/
	30
760285e7 DH	31	#include <drm/ttm/ttm_bo_driver.h>
760285e7 DH	32	#include <drm/ttm/ttm_placement.h>
ba4e7d97 TH	33	#include <linux/io.h>
	34	#include <linux/highmem.h>
	35	#include <linux/wait.h>
5a0e3ad6	36	#include <linux/slab.h>
ba4e7d97	37	#include <linux/vmalloc.h>
ba4e7d97 TH	38	#include <linux/module.h>
	39
	40	void ttm_bo_free_old_node(struct ttm_buffer_object *bo)
	41	{
42311ff9	42	ttm_bo_mem_put(bo, &bo->mem);
ba4e7d97 TH	43	}
	44
	45	int ttm_bo_move_ttm(struct ttm_buffer_object *bo,
97a875cb	46	bool evict,
9d87fa21	47	bool no_wait_gpu, struct ttm_mem_reg *new_mem)
ba4e7d97 TH	48	{
	49	struct ttm_tt *ttm = bo->ttm;
	50	struct ttm_mem_reg *old_mem = &bo->mem;
ba4e7d97 TH	51	int ret;
	52
	53	if (old_mem->mem_type != TTM_PL_SYSTEM) {
	54	ttm_tt_unbind(ttm);
	55	ttm_bo_free_old_node(bo);
	56	ttm_flag_masked(&old_mem->placement, TTM_PL_FLAG_SYSTEM,
	57	TTM_PL_MASK_MEM);
	58	old_mem->mem_type = TTM_PL_SYSTEM;
ba4e7d97 TH	59	}
	60
	61	ret = ttm_tt_set_placement_caching(ttm, new_mem->placement);
	62	if (unlikely(ret != 0))
	63	return ret;
	64
	65	if (new_mem->mem_type != TTM_PL_SYSTEM) {
	66	ret = ttm_tt_bind(ttm, new_mem);
	67	if (unlikely(ret != 0))
	68	return ret;
	69	}
	70
	71	old_mem = new_mem;
	72	new_mem->mm_node = NULL;
110b20c3	73
ba4e7d97 TH	74	return 0;
	75	}
	76	EXPORT_SYMBOL(ttm_bo_move_ttm);
	77
eba67093	78	int ttm_mem_io_lock(struct ttm_mem_type_manager *man, bool interruptible)
82c5da6b	79	{
eba67093 TH	80	if (likely(man->io_reserve_fastpath))
	81	return 0;
	82
	83	if (interruptible)
	84	return mutex_lock_interruptible(&man->io_reserve_mutex);
	85
	86	mutex_lock(&man->io_reserve_mutex);
	87	return 0;
	88	}
afe6804c	89	EXPORT_SYMBOL(ttm_mem_io_lock);
82c5da6b	90
eba67093 TH	91	void ttm_mem_io_unlock(struct ttm_mem_type_manager *man)
	92	{
	93	if (likely(man->io_reserve_fastpath))
	94	return;
	95
	96	mutex_unlock(&man->io_reserve_mutex);
	97	}
afe6804c	98	EXPORT_SYMBOL(ttm_mem_io_unlock);
eba67093 TH	99
	100	static int ttm_mem_io_evict(struct ttm_mem_type_manager *man)
	101	{
	102	struct ttm_buffer_object *bo;
	103
	104	if (!man->use_io_reserve_lru \|\| list_empty(&man->io_reserve_lru))
	105	return -EAGAIN;
	106
	107	bo = list_first_entry(&man->io_reserve_lru,
	108	struct ttm_buffer_object,
	109	io_reserve_lru);
	110	list_del_init(&bo->io_reserve_lru);
	111	ttm_bo_unmap_virtual_locked(bo);
	112
	113	return 0;
	114	}
	115
afe6804c DA	116
	117	int ttm_mem_io_reserve(struct ttm_bo_device *bdev,
	118	struct ttm_mem_reg *mem)
eba67093 TH	119	{
	120	struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
	121	int ret = 0;
	122
	123	if (!bdev->driver->io_mem_reserve)
	124	return 0;
	125	if (likely(man->io_reserve_fastpath))
	126	return bdev->driver->io_mem_reserve(bdev, mem);
	127
	128	if (bdev->driver->io_mem_reserve &&
	129	mem->bus.io_reserved_count++ == 0) {
	130	retry:
0c321c79	131	ret = bdev->driver->io_mem_reserve(bdev, mem);
eba67093 TH	132	if (ret == -EAGAIN) {
	133	ret = ttm_mem_io_evict(man);
	134	if (ret == 0)
	135	goto retry;
	136	}
	137	}
	138	return ret;
	139	}
afe6804c	140	EXPORT_SYMBOL(ttm_mem_io_reserve);
eba67093	141
afe6804c DA	142	void ttm_mem_io_free(struct ttm_bo_device *bdev,
afe6804c DA	143	struct ttm_mem_reg *mem)
eba67093 TH	144	{
	145	struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
	146
	147	if (likely(man->io_reserve_fastpath))
	148	return;
	149
	150	if (bdev->driver->io_mem_reserve &&
	151	--mem->bus.io_reserved_count == 0 &&
	152	bdev->driver->io_mem_free)
	153	bdev->driver->io_mem_free(bdev, mem);
	154
	155	}
afe6804c	156	EXPORT_SYMBOL(ttm_mem_io_free);
eba67093 TH	157
	158	int ttm_mem_io_reserve_vm(struct ttm_buffer_object *bo)
	159	{
	160	struct ttm_mem_reg *mem = &bo->mem;
	161	int ret;
	162
	163	if (!mem->bus.io_reserved_vm) {
	164	struct ttm_mem_type_manager *man =
	165	&bo->bdev->man[mem->mem_type];
	166
	167	ret = ttm_mem_io_reserve(bo->bdev, mem);
82c5da6b JG	168	if (unlikely(ret != 0))
82c5da6b JG	169	return ret;
eba67093 TH	170	mem->bus.io_reserved_vm = true;
	171	if (man->use_io_reserve_lru)
	172	list_add_tail(&bo->io_reserve_lru,
	173	&man->io_reserve_lru);
82c5da6b JG	174	}
	175	return 0;
	176	}
	177
eba67093	178	void ttm_mem_io_free_vm(struct ttm_buffer_object *bo)
82c5da6b	179	{
eba67093 TH	180	struct ttm_mem_reg *mem = &bo->mem;
	181
	182	if (mem->bus.io_reserved_vm) {
	183	mem->bus.io_reserved_vm = false;
	184	list_del_init(&bo->io_reserve_lru);
	185	ttm_mem_io_free(bo->bdev, mem);
82c5da6b JG	186	}
	187	}
	188
ba4e7d97 TH	189	int ttm_mem_reg_ioremap(struct ttm_bo_device bdev, struct ttm_mem_reg mem,
	190	void **virtual)
	191	{
eba67093	192	struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
ba4e7d97 TH	193	int ret;
	194	void *addr;
	195
	196	*virtual = NULL;
eba67093	197	(void) ttm_mem_io_lock(man, false);
82c5da6b	198	ret = ttm_mem_io_reserve(bdev, mem);
eba67093	199	ttm_mem_io_unlock(man);
9e51159c	200	if (ret \|\| !mem->bus.is_iomem)
ba4e7d97 TH	201	return ret;
ba4e7d97 TH	202
82c5da6b JG	203	if (mem->bus.addr) {
	204	addr = mem->bus.addr;
	205	} else {
ba4e7d97	206	if (mem->placement & TTM_PL_FLAG_WC)
82c5da6b	207	addr = ioremap_wc(mem->bus.base + mem->bus.offset, mem->bus.size);
ba4e7d97	208	else
82c5da6b JG	209	addr = ioremap_nocache(mem->bus.base + mem->bus.offset, mem->bus.size);
82c5da6b JG	210	if (!addr) {
eba67093	211	(void) ttm_mem_io_lock(man, false);
82c5da6b	212	ttm_mem_io_free(bdev, mem);
eba67093	213	ttm_mem_io_unlock(man);
ba4e7d97	214	return -ENOMEM;
82c5da6b	215	}
ba4e7d97 TH	216	}
	217	*virtual = addr;
	218	return 0;
	219	}
	220
	221	void ttm_mem_reg_iounmap(struct ttm_bo_device bdev, struct ttm_mem_reg mem,
	222	void *virtual)
	223	{
	224	struct ttm_mem_type_manager *man;
	225
	226	man = &bdev->man[mem->mem_type];
	227
0c321c79	228	if (virtual && mem->bus.addr == NULL)
ba4e7d97	229	iounmap(virtual);
eba67093	230	(void) ttm_mem_io_lock(man, false);
82c5da6b	231	ttm_mem_io_free(bdev, mem);
eba67093	232	ttm_mem_io_unlock(man);
ba4e7d97 TH	233	}
	234
	235	static int ttm_copy_io_page(void dst, void src, unsigned long page)
	236	{
	237	uint32_t *dstP =
	238	(uint32_t *) ((unsigned long)dst + (page << PAGE_SHIFT));
	239	uint32_t *srcP =
	240	(uint32_t *) ((unsigned long)src + (page << PAGE_SHIFT));
	241
	242	int i;
	243	for (i = 0; i < PAGE_SIZE / sizeof(uint32_t); ++i)
	244	iowrite32(ioread32(srcP++), dstP++);
	245	return 0;
	246	}
	247
	248	static int ttm_copy_io_ttm_page(struct ttm_tt ttm, void src,
542c6f6d TH	249	unsigned long page,
542c6f6d TH	250	pgprot_t prot)
ba4e7d97	251	{
b1e5f172	252	struct page *d = ttm->pages[page];
ba4e7d97 TH	253	void *dst;
	254
	255	if (!d)
	256	return -ENOMEM;
	257
	258	src = (void *)((unsigned long)src + (page << PAGE_SHIFT));
542c6f6d TH	259
542c6f6d TH	260	#ifdef CONFIG_X86
3e4d3af5	261	dst = kmap_atomic_prot(d, prot);
542c6f6d	262	#else
6d0897ba	263	if (pgprot_val(prot) != pgprot_val(PAGE_KERNEL))
542c6f6d TH	264	dst = vmap(&d, 1, 0, prot);
	265	else
	266	dst = kmap(d);
	267	#endif
ba4e7d97 TH	268	if (!dst)
	269	return -ENOMEM;
	270
	271	memcpy_fromio(dst, src, PAGE_SIZE);
542c6f6d TH	272
542c6f6d TH	273	#ifdef CONFIG_X86
3e4d3af5	274	kunmap_atomic(dst);
542c6f6d	275	#else
6d0897ba	276	if (pgprot_val(prot) != pgprot_val(PAGE_KERNEL))
542c6f6d TH	277	vunmap(dst);
	278	else
	279	kunmap(d);
	280	#endif
	281
ba4e7d97 TH	282	return 0;
	283	}
	284
	285	static int ttm_copy_ttm_io_page(struct ttm_tt ttm, void dst,
542c6f6d TH	286	unsigned long page,
542c6f6d TH	287	pgprot_t prot)
ba4e7d97	288	{
b1e5f172	289	struct page *s = ttm->pages[page];
ba4e7d97 TH	290	void *src;
	291
	292	if (!s)
	293	return -ENOMEM;
	294
	295	dst = (void *)((unsigned long)dst + (page << PAGE_SHIFT));
542c6f6d	296	#ifdef CONFIG_X86
3e4d3af5	297	src = kmap_atomic_prot(s, prot);
542c6f6d	298	#else
6d0897ba	299	if (pgprot_val(prot) != pgprot_val(PAGE_KERNEL))
542c6f6d TH	300	src = vmap(&s, 1, 0, prot);
	301	else
	302	src = kmap(s);
	303	#endif
ba4e7d97 TH	304	if (!src)
	305	return -ENOMEM;
	306
	307	memcpy_toio(dst, src, PAGE_SIZE);
542c6f6d TH	308
542c6f6d TH	309	#ifdef CONFIG_X86
3e4d3af5	310	kunmap_atomic(src);
542c6f6d	311	#else
6d0897ba	312	if (pgprot_val(prot) != pgprot_val(PAGE_KERNEL))
542c6f6d TH	313	vunmap(src);
	314	else
	315	kunmap(s);
	316	#endif
	317
ba4e7d97 TH	318	return 0;
	319	}
	320
	321	int ttm_bo_move_memcpy(struct ttm_buffer_object *bo,
97a875cb	322	bool evict, bool no_wait_gpu,
9d87fa21	323	struct ttm_mem_reg *new_mem)
ba4e7d97 TH	324	{
	325	struct ttm_bo_device *bdev = bo->bdev;
	326	struct ttm_mem_type_manager *man = &bdev->man[new_mem->mem_type];
	327	struct ttm_tt *ttm = bo->ttm;
	328	struct ttm_mem_reg *old_mem = &bo->mem;
e22469ca	329	struct ttm_mem_reg old_copy = *old_mem;
ba4e7d97 TH	330	void *old_iomap;
	331	void *new_iomap;
	332	int ret;
ba4e7d97 TH	333	unsigned long i;
	334	unsigned long page;
	335	unsigned long add = 0;
	336	int dir;
	337
	338	ret = ttm_mem_reg_ioremap(bdev, old_mem, &old_iomap);
	339	if (ret)
	340	return ret;
	341	ret = ttm_mem_reg_ioremap(bdev, new_mem, &new_iomap);
	342	if (ret)
	343	goto out;
	344
	345	if (old_iomap == NULL && new_iomap == NULL)
	346	goto out2;
	347	if (old_iomap == NULL && ttm == NULL)
	348	goto out2;
	349
b1e5f172 JG	350	if (ttm->state == tt_unpopulated) {
b1e5f172 JG	351	ret = ttm->bdev->driver->ttm_tt_populate(ttm);
63054186 DA	352	if (ret) {
	353	/* if we fail here don't nuke the mm node
	354	* as the bo still owns it */
	355	old_copy.mm_node = NULL;
b1e5f172	356	goto out1;
63054186	357	}
b1e5f172 JG	358	}
b1e5f172 JG	359
ba4e7d97 TH	360	add = 0;
	361	dir = 1;
	362
	363	if ((old_mem->mem_type == new_mem->mem_type) &&
d961db75	364	(new_mem->start < old_mem->start + old_mem->size)) {
ba4e7d97 TH	365	dir = -1;
	366	add = new_mem->num_pages - 1;
	367	}
	368
	369	for (i = 0; i < new_mem->num_pages; ++i) {
	370	page = i * dir + add;
542c6f6d TH	371	if (old_iomap == NULL) {
	372	pgprot_t prot = ttm_io_prot(old_mem->placement,
	373	PAGE_KERNEL);
	374	ret = ttm_copy_ttm_io_page(ttm, new_iomap, page,
	375	prot);
	376	} else if (new_iomap == NULL) {
	377	pgprot_t prot = ttm_io_prot(new_mem->placement,
	378	PAGE_KERNEL);
	379	ret = ttm_copy_io_ttm_page(ttm, old_iomap, page,
	380	prot);
	381	} else
ba4e7d97	382	ret = ttm_copy_io_page(new_iomap, old_iomap, page);
63054186 DA	383	if (ret) {
	384	/* failing here, means keep old copy as-is */
	385	old_copy.mm_node = NULL;
ba4e7d97	386	goto out1;
63054186	387	}
ba4e7d97 TH	388	}
	389	mb();
	390	out2:
eba67093	391	old_copy = *old_mem;
ba4e7d97 TH	392	old_mem = new_mem;
ba4e7d97 TH	393	new_mem->mm_node = NULL;
ba4e7d97 TH	394
	395	if ((man->flags & TTM_MEMTYPE_FLAG_FIXED) && (ttm != NULL)) {
	396	ttm_tt_unbind(ttm);
	397	ttm_tt_destroy(ttm);
	398	bo->ttm = NULL;
	399	}
	400
	401	out1:
eba67093	402	ttm_mem_reg_iounmap(bdev, old_mem, new_iomap);
ba4e7d97 TH	403	out:
ba4e7d97 TH	404	ttm_mem_reg_iounmap(bdev, &old_copy, old_iomap);
b921bae2	405	ttm_bo_mem_put(bo, &old_copy);
ba4e7d97 TH	406	return ret;
	407	}
	408	EXPORT_SYMBOL(ttm_bo_move_memcpy);
	409
	410	static void ttm_transfered_destroy(struct ttm_buffer_object *bo)
	411	{
	412	kfree(bo);
	413	}
	414
	415	/**
	416	* ttm_buffer_object_transfer
	417	*
	418	* @bo: A pointer to a struct ttm_buffer_object.
	419	* @new_obj: A pointer to a pointer to a newly created ttm_buffer_object,
	420	* holding the data of @bo with the old placement.
	421	*
	422	* This is a utility function that may be called after an accelerated move
	423	* has been scheduled. A new buffer object is created as a placeholder for
	424	* the old data while it's being copied. When that buffer object is idle,
	425	* it can be destroyed, releasing the space of the old placement.
	426	* Returns:
	427	* !0: Failure.
	428	*/
	429
	430	static int ttm_buffer_object_transfer(struct ttm_buffer_object *bo,
	431	struct ttm_buffer_object **new_obj)
	432	{
	433	struct ttm_buffer_object *fbo;
	434	struct ttm_bo_device *bdev = bo->bdev;
	435	struct ttm_bo_driver *driver = bdev->driver;
	436
ff7c60c5	437	fbo = kmalloc(sizeof(*fbo), GFP_KERNEL);
ba4e7d97 TH	438	if (!fbo)
	439	return -ENOMEM;
	440
	441	fbo = bo;
	442
	443	/**
	444	* Fix up members that we shouldn't copy directly:
	445	* TODO: Explicit member copy would probably be better here.
	446	*/
	447
ba4e7d97 TH	448	init_waitqueue_head(&fbo->event_queue);
	449	INIT_LIST_HEAD(&fbo->ddestroy);
	450	INIT_LIST_HEAD(&fbo->lru);
	451	INIT_LIST_HEAD(&fbo->swap);
eba67093	452	INIT_LIST_HEAD(&fbo->io_reserve_lru);
ba4e7d97	453	fbo->vm_node = NULL;
0fbecd40	454	atomic_set(&fbo->cpu_writers, 0);
ba4e7d97	455
ff7c60c5 DV	456	spin_lock(&bdev->fence_lock);
	457	if (bo->sync_obj)
	458	fbo->sync_obj = driver->sync_obj_ref(bo->sync_obj);
	459	else
	460	fbo->sync_obj = NULL;
	461	spin_unlock(&bdev->fence_lock);
ba4e7d97 TH	462	kref_init(&fbo->list_kref);
	463	kref_init(&fbo->kref);
	464	fbo->destroy = &ttm_transfered_destroy;
57de4ba9	465	fbo->acc_size = 0;
ba4e7d97 TH	466
	467	*new_obj = fbo;
	468	return 0;
	469	}
	470
	471	pgprot_t ttm_io_prot(uint32_t caching_flags, pgprot_t tmp)
	472	{
	473	#if defined(__i386__) \|\| defined(__x86_64__)
	474	if (caching_flags & TTM_PL_FLAG_WC)
	475	tmp = pgprot_writecombine(tmp);
	476	else if (boot_cpu_data.x86 > 3)
	477	tmp = pgprot_noncached(tmp);
	478
	479	#elif defined(__powerpc__)
	480	if (!(caching_flags & TTM_PL_FLAG_CACHED)) {
	481	pgprot_val(tmp) \|= _PAGE_NO_CACHE;
	482	if (caching_flags & TTM_PL_FLAG_UNCACHED)
	483	pgprot_val(tmp) \|= _PAGE_GUARDED;
	484	}
	485	#endif
	486	#if defined(__ia64__)
	487	if (caching_flags & TTM_PL_FLAG_WC)
	488	tmp = pgprot_writecombine(tmp);
	489	else
	490	tmp = pgprot_noncached(tmp);
	491	#endif
04cf55e1	492	#if defined(__sparc__) \|\| defined(__mips__)
ba4e7d97 TH	493	if (!(caching_flags & TTM_PL_FLAG_CACHED))
	494	tmp = pgprot_noncached(tmp);
	495	#endif
	496	return tmp;
	497	}
4bfd75cb	498	EXPORT_SYMBOL(ttm_io_prot);
ba4e7d97 TH	499
ba4e7d97 TH	500	static int ttm_bo_ioremap(struct ttm_buffer_object *bo,
82c5da6b JG	501	unsigned long offset,
82c5da6b JG	502	unsigned long size,
ba4e7d97 TH	503	struct ttm_bo_kmap_obj *map)
ba4e7d97 TH	504	{
ba4e7d97	505	struct ttm_mem_reg *mem = &bo->mem;
ba4e7d97	506
82c5da6b	507	if (bo->mem.bus.addr) {
ba4e7d97	508	map->bo_kmap_type = ttm_bo_map_premapped;
82c5da6b	509	map->virtual = (void )(((u8 )bo->mem.bus.addr) + offset);
ba4e7d97 TH	510	} else {
	511	map->bo_kmap_type = ttm_bo_map_iomap;
	512	if (mem->placement & TTM_PL_FLAG_WC)
82c5da6b JG	513	map->virtual = ioremap_wc(bo->mem.bus.base + bo->mem.bus.offset + offset,
82c5da6b JG	514	size);
ba4e7d97	515	else
82c5da6b JG	516	map->virtual = ioremap_nocache(bo->mem.bus.base + bo->mem.bus.offset + offset,
82c5da6b JG	517	size);
ba4e7d97 TH	518	}
	519	return (!map->virtual) ? -ENOMEM : 0;
	520	}
	521
	522	static int ttm_bo_kmap_ttm(struct ttm_buffer_object *bo,
	523	unsigned long start_page,
	524	unsigned long num_pages,
	525	struct ttm_bo_kmap_obj *map)
	526	{
	527	struct ttm_mem_reg *mem = &bo->mem; pgprot_t prot;
	528	struct ttm_tt *ttm = bo->ttm;
b1e5f172	529	int ret;
ba4e7d97 TH	530
ba4e7d97 TH	531	BUG_ON(!ttm);
b1e5f172 JG	532
	533	if (ttm->state == tt_unpopulated) {
	534	ret = ttm->bdev->driver->ttm_tt_populate(ttm);
	535	if (ret)
	536	return ret;
	537	}
	538
ba4e7d97 TH	539	if (num_pages == 1 && (mem->placement & TTM_PL_FLAG_CACHED)) {
	540	/*
	541	* We're mapping a single page, and the desired
	542	* page protection is consistent with the bo.
	543	*/
	544
	545	map->bo_kmap_type = ttm_bo_map_kmap;
b1e5f172	546	map->page = ttm->pages[start_page];
ba4e7d97 TH	547	map->virtual = kmap(map->page);
ba4e7d97 TH	548	} else {
ba4e7d97 TH	549	/*
ba4e7d97 TH	550	* We need to use vmap to get the desired page protection
af901ca1	551	* or to make the buffer object look contiguous.
ba4e7d97 TH	552	*/
	553	prot = (mem->placement & TTM_PL_FLAG_CACHED) ?
	554	PAGE_KERNEL :
	555	ttm_io_prot(mem->placement, PAGE_KERNEL);
	556	map->bo_kmap_type = ttm_bo_map_vmap;
	557	map->virtual = vmap(ttm->pages + start_page, num_pages,
	558	0, prot);
	559	}
	560	return (!map->virtual) ? -ENOMEM : 0;
	561	}
	562
	563	int ttm_bo_kmap(struct ttm_buffer_object *bo,
	564	unsigned long start_page, unsigned long num_pages,
	565	struct ttm_bo_kmap_obj *map)
	566	{
eba67093 TH	567	struct ttm_mem_type_manager *man =
eba67093 TH	568	&bo->bdev->man[bo->mem.mem_type];
82c5da6b	569	unsigned long offset, size;
ba4e7d97	570	int ret;
ba4e7d97 TH	571
	572	BUG_ON(!list_empty(&bo->swap));
	573	map->virtual = NULL;
82c5da6b	574	map->bo = bo;
ba4e7d97 TH	575	if (num_pages > bo->num_pages)
	576	return -EINVAL;
	577	if (start_page > bo->num_pages)
	578	return -EINVAL;
	579	#if 0
	580	if (num_pages > 1 && !DRM_SUSER(DRM_CURPROC))
	581	return -EPERM;
	582	#endif
eba67093	583	(void) ttm_mem_io_lock(man, false);
82c5da6b	584	ret = ttm_mem_io_reserve(bo->bdev, &bo->mem);
eba67093	585	ttm_mem_io_unlock(man);
ba4e7d97 TH	586	if (ret)
ba4e7d97 TH	587	return ret;
82c5da6b	588	if (!bo->mem.bus.is_iomem) {
ba4e7d97 TH	589	return ttm_bo_kmap_ttm(bo, start_page, num_pages, map);
ba4e7d97 TH	590	} else {
82c5da6b JG	591	offset = start_page << PAGE_SHIFT;
	592	size = num_pages << PAGE_SHIFT;
	593	return ttm_bo_ioremap(bo, offset, size, map);
ba4e7d97 TH	594	}
	595	}
	596	EXPORT_SYMBOL(ttm_bo_kmap);
	597
	598	void ttm_bo_kunmap(struct ttm_bo_kmap_obj *map)
	599	{
eba67093 TH	600	struct ttm_buffer_object *bo = map->bo;
	601	struct ttm_mem_type_manager *man =
	602	&bo->bdev->man[bo->mem.mem_type];
	603
ba4e7d97 TH	604	if (!map->virtual)
	605	return;
	606	switch (map->bo_kmap_type) {
	607	case ttm_bo_map_iomap:
	608	iounmap(map->virtual);
	609	break;
	610	case ttm_bo_map_vmap:
	611	vunmap(map->virtual);
	612	break;
	613	case ttm_bo_map_kmap:
	614	kunmap(map->page);
	615	break;
	616	case ttm_bo_map_premapped:
	617	break;
	618	default:
	619	BUG();
	620	}
eba67093 TH	621	(void) ttm_mem_io_lock(man, false);
	622	ttm_mem_io_free(map->bo->bdev, &map->bo->mem);
	623	ttm_mem_io_unlock(man);
ba4e7d97 TH	624	map->virtual = NULL;
	625	map->page = NULL;
	626	}
	627	EXPORT_SYMBOL(ttm_bo_kunmap);
	628
ba4e7d97 TH	629	int ttm_bo_move_accel_cleanup(struct ttm_buffer_object *bo,
ba4e7d97 TH	630	void *sync_obj,
97a875cb	631	bool evict,
9d87fa21	632	bool no_wait_gpu,
ba4e7d97 TH	633	struct ttm_mem_reg *new_mem)
	634	{
	635	struct ttm_bo_device *bdev = bo->bdev;
	636	struct ttm_bo_driver *driver = bdev->driver;
	637	struct ttm_mem_type_manager *man = &bdev->man[new_mem->mem_type];
	638	struct ttm_mem_reg *old_mem = &bo->mem;
	639	int ret;
ba4e7d97 TH	640	struct ttm_buffer_object *ghost_obj;
	641	void *tmp_obj = NULL;
	642
702adba2	643	spin_lock(&bdev->fence_lock);
ba4e7d97 TH	644	if (bo->sync_obj) {
	645	tmp_obj = bo->sync_obj;
	646	bo->sync_obj = NULL;
	647	}
	648	bo->sync_obj = driver->sync_obj_ref(sync_obj);
ba4e7d97 TH	649	if (evict) {
ba4e7d97 TH	650	ret = ttm_bo_wait(bo, false, false, false);
702adba2	651	spin_unlock(&bdev->fence_lock);
4677f15c TH	652	if (tmp_obj)
4677f15c TH	653	driver->sync_obj_unref(&tmp_obj);
ba4e7d97 TH	654	if (ret)
	655	return ret;
	656
ba4e7d97 TH	657	if ((man->flags & TTM_MEMTYPE_FLAG_FIXED) &&
	658	(bo->ttm != NULL)) {
	659	ttm_tt_unbind(bo->ttm);
	660	ttm_tt_destroy(bo->ttm);
	661	bo->ttm = NULL;
	662	}
eac20953	663	ttm_bo_free_old_node(bo);
ba4e7d97 TH	664	} else {
	665	/**
	666	* This should help pipeline ordinary buffer moves.
	667	*
	668	* Hang old buffer memory on a new buffer object,
	669	* and leave it to be released when the GPU
	670	* operation has completed.
	671	*/
	672
	673	set_bit(TTM_BO_PRIV_FLAG_MOVING, &bo->priv_flags);
702adba2	674	spin_unlock(&bdev->fence_lock);
4677f15c TH	675	if (tmp_obj)
4677f15c TH	676	driver->sync_obj_unref(&tmp_obj);
ba4e7d97	677
ff7c60c5	678	ret = ttm_buffer_object_transfer(bo, &ghost_obj);
ba4e7d97 TH	679	if (ret)
	680	return ret;
	681
	682	/**
	683	* If we're not moving to fixed memory, the TTM object
	684	* needs to stay alive. Otherwhise hang it on the ghost
	685	* bo to be unbound and destroyed.
	686	*/
	687
	688	if (!(man->flags & TTM_MEMTYPE_FLAG_FIXED))
	689	ghost_obj->ttm = NULL;
	690	else
	691	bo->ttm = NULL;
	692
	693	ttm_bo_unreserve(ghost_obj);
	694	ttm_bo_unref(&ghost_obj);
	695	}
	696
	697	old_mem = new_mem;
	698	new_mem->mm_node = NULL;
110b20c3	699
ba4e7d97 TH	700	return 0;
	701	}
	702	EXPORT_SYMBOL(ttm_bo_move_accel_cleanup);