[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 <drm/drm_vma_manager.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>
#include <linux/reservation.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);
	}
}

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 || (ttm->state == tt_unpopulated &&
			     !(ttm->page_flags & TTM_PAGE_FLAG_SWAPPED)))) {
		memset_io(new_iomap, 0, new_mem->num_pages*PAGE_SIZE);
		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;
	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);

	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)
{
	/* Cached mappings need no adjustment */
	if (caching_flags & TTM_PL_FLAG_CACHED)
		return 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);
#endif
#if defined(__ia64__) || defined(__arm__) || defined(__aarch64__) || \
    defined(__powerpc__)
	if (caching_flags & TTM_PL_FLAG_WC)
		tmp = pgprot_writecombine(tmp);
	else
		tmp = pgprot_noncached(tmp);
#endif
#if defined(__sparc__) || defined(__mips__)
	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 = 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,
			      struct fence *fence,
			      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_mem_reg *old_mem = &bo->mem;
	int ret;
	struct ttm_buffer_object *ghost_obj;

	reservation_object_add_excl_fence(bo->resv, fence);
	if (evict) {
		ret = ttm_bo_wait(bo, false, false, false);
		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);

		ret = ttm_buffer_object_transfer(bo, &ghost_obj);
		if (ret)
			return ret;

		reservation_object_add_excl_fence(ghost_obj->resv, fence);

		/**
		 * 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>
72525b3f	33	#include <drm/drm_vma_manager.h>
ba4e7d97 TH	34	#include <linux/io.h>
	35	#include <linux/highmem.h>
	36	#include <linux/wait.h>
5a0e3ad6	37	#include <linux/slab.h>
ba4e7d97	38	#include <linux/vmalloc.h>
ba4e7d97	39	#include <linux/module.h>
f2c24b83	40	#include <linux/reservation.h>
ba4e7d97 TH	41
	42	void ttm_bo_free_old_node(struct ttm_buffer_object *bo)
	43	{
42311ff9	44	ttm_bo_mem_put(bo, &bo->mem);
ba4e7d97 TH	45	}
	46
	47	int ttm_bo_move_ttm(struct ttm_buffer_object *bo,
97a875cb	48	bool evict,
9d87fa21	49	bool no_wait_gpu, struct ttm_mem_reg *new_mem)
ba4e7d97 TH	50	{
	51	struct ttm_tt *ttm = bo->ttm;
	52	struct ttm_mem_reg *old_mem = &bo->mem;
ba4e7d97 TH	53	int ret;
	54
	55	if (old_mem->mem_type != TTM_PL_SYSTEM) {
	56	ttm_tt_unbind(ttm);
	57	ttm_bo_free_old_node(bo);
	58	ttm_flag_masked(&old_mem->placement, TTM_PL_FLAG_SYSTEM,
	59	TTM_PL_MASK_MEM);
	60	old_mem->mem_type = TTM_PL_SYSTEM;
ba4e7d97 TH	61	}
	62
	63	ret = ttm_tt_set_placement_caching(ttm, new_mem->placement);
	64	if (unlikely(ret != 0))
	65	return ret;
	66
	67	if (new_mem->mem_type != TTM_PL_SYSTEM) {
	68	ret = ttm_tt_bind(ttm, new_mem);
	69	if (unlikely(ret != 0))
	70	return ret;
	71	}
	72
	73	old_mem = new_mem;
	74	new_mem->mm_node = NULL;
110b20c3	75
ba4e7d97 TH	76	return 0;
	77	}
	78	EXPORT_SYMBOL(ttm_bo_move_ttm);
	79
eba67093	80	int ttm_mem_io_lock(struct ttm_mem_type_manager *man, bool interruptible)
82c5da6b	81	{
eba67093 TH	82	if (likely(man->io_reserve_fastpath))
	83	return 0;
	84
	85	if (interruptible)
	86	return mutex_lock_interruptible(&man->io_reserve_mutex);
	87
	88	mutex_lock(&man->io_reserve_mutex);
	89	return 0;
	90	}
afe6804c	91	EXPORT_SYMBOL(ttm_mem_io_lock);
82c5da6b	92
eba67093 TH	93	void ttm_mem_io_unlock(struct ttm_mem_type_manager *man)
	94	{
	95	if (likely(man->io_reserve_fastpath))
	96	return;
	97
	98	mutex_unlock(&man->io_reserve_mutex);
	99	}
afe6804c	100	EXPORT_SYMBOL(ttm_mem_io_unlock);
eba67093 TH	101
	102	static int ttm_mem_io_evict(struct ttm_mem_type_manager *man)
	103	{
	104	struct ttm_buffer_object *bo;
	105
	106	if (!man->use_io_reserve_lru \|\| list_empty(&man->io_reserve_lru))
	107	return -EAGAIN;
	108
	109	bo = list_first_entry(&man->io_reserve_lru,
	110	struct ttm_buffer_object,
	111	io_reserve_lru);
	112	list_del_init(&bo->io_reserve_lru);
	113	ttm_bo_unmap_virtual_locked(bo);
	114
	115	return 0;
	116	}
	117
afe6804c DA	118
	119	int ttm_mem_io_reserve(struct ttm_bo_device *bdev,
	120	struct ttm_mem_reg *mem)
eba67093 TH	121	{
	122	struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
	123	int ret = 0;
	124
	125	if (!bdev->driver->io_mem_reserve)
	126	return 0;
	127	if (likely(man->io_reserve_fastpath))
	128	return bdev->driver->io_mem_reserve(bdev, mem);
	129
	130	if (bdev->driver->io_mem_reserve &&
	131	mem->bus.io_reserved_count++ == 0) {
	132	retry:
0c321c79	133	ret = bdev->driver->io_mem_reserve(bdev, mem);
eba67093 TH	134	if (ret == -EAGAIN) {
	135	ret = ttm_mem_io_evict(man);
	136	if (ret == 0)
	137	goto retry;
	138	}
	139	}
	140	return ret;
	141	}
afe6804c	142	EXPORT_SYMBOL(ttm_mem_io_reserve);
eba67093	143
afe6804c DA	144	void ttm_mem_io_free(struct ttm_bo_device *bdev,
afe6804c DA	145	struct ttm_mem_reg *mem)
eba67093 TH	146	{
	147	struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
	148
	149	if (likely(man->io_reserve_fastpath))
	150	return;
	151
	152	if (bdev->driver->io_mem_reserve &&
	153	--mem->bus.io_reserved_count == 0 &&
	154	bdev->driver->io_mem_free)
	155	bdev->driver->io_mem_free(bdev, mem);
	156
	157	}
afe6804c	158	EXPORT_SYMBOL(ttm_mem_io_free);
eba67093 TH	159
	160	int ttm_mem_io_reserve_vm(struct ttm_buffer_object *bo)
	161	{
	162	struct ttm_mem_reg *mem = &bo->mem;
	163	int ret;
	164
	165	if (!mem->bus.io_reserved_vm) {
	166	struct ttm_mem_type_manager *man =
	167	&bo->bdev->man[mem->mem_type];
	168
	169	ret = ttm_mem_io_reserve(bo->bdev, mem);
82c5da6b JG	170	if (unlikely(ret != 0))
82c5da6b JG	171	return ret;
eba67093 TH	172	mem->bus.io_reserved_vm = true;
	173	if (man->use_io_reserve_lru)
	174	list_add_tail(&bo->io_reserve_lru,
	175	&man->io_reserve_lru);
82c5da6b JG	176	}
	177	return 0;
	178	}
	179
eba67093	180	void ttm_mem_io_free_vm(struct ttm_buffer_object *bo)
82c5da6b	181	{
eba67093 TH	182	struct ttm_mem_reg *mem = &bo->mem;
	183
	184	if (mem->bus.io_reserved_vm) {
	185	mem->bus.io_reserved_vm = false;
	186	list_del_init(&bo->io_reserve_lru);
	187	ttm_mem_io_free(bo->bdev, mem);
82c5da6b JG	188	}
	189	}
	190
dcbff15a	191	static int ttm_mem_reg_ioremap(struct ttm_bo_device bdev, struct ttm_mem_reg mem,
ba4e7d97 TH	192	void **virtual)
ba4e7d97 TH	193	{
eba67093	194	struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
ba4e7d97 TH	195	int ret;
	196	void *addr;
	197
	198	*virtual = NULL;
eba67093	199	(void) ttm_mem_io_lock(man, false);
82c5da6b	200	ret = ttm_mem_io_reserve(bdev, mem);
eba67093	201	ttm_mem_io_unlock(man);
9e51159c	202	if (ret \|\| !mem->bus.is_iomem)
ba4e7d97 TH	203	return ret;
ba4e7d97 TH	204
82c5da6b JG	205	if (mem->bus.addr) {
	206	addr = mem->bus.addr;
	207	} else {
ba4e7d97	208	if (mem->placement & TTM_PL_FLAG_WC)
82c5da6b	209	addr = ioremap_wc(mem->bus.base + mem->bus.offset, mem->bus.size);
ba4e7d97	210	else
82c5da6b JG	211	addr = ioremap_nocache(mem->bus.base + mem->bus.offset, mem->bus.size);
82c5da6b JG	212	if (!addr) {
eba67093	213	(void) ttm_mem_io_lock(man, false);
82c5da6b	214	ttm_mem_io_free(bdev, mem);
eba67093	215	ttm_mem_io_unlock(man);
ba4e7d97	216	return -ENOMEM;
82c5da6b	217	}
ba4e7d97 TH	218	}
	219	*virtual = addr;
	220	return 0;
	221	}
	222
dcbff15a	223	static void ttm_mem_reg_iounmap(struct ttm_bo_device bdev, struct ttm_mem_reg mem,
ba4e7d97 TH	224	void *virtual)
	225	{
	226	struct ttm_mem_type_manager *man;
	227
	228	man = &bdev->man[mem->mem_type];
	229
0c321c79	230	if (virtual && mem->bus.addr == NULL)
ba4e7d97	231	iounmap(virtual);
eba67093	232	(void) ttm_mem_io_lock(man, false);
82c5da6b	233	ttm_mem_io_free(bdev, mem);
eba67093	234	ttm_mem_io_unlock(man);
ba4e7d97 TH	235	}
	236
	237	static int ttm_copy_io_page(void dst, void src, unsigned long page)
	238	{
	239	uint32_t *dstP =
	240	(uint32_t *) ((unsigned long)dst + (page << PAGE_SHIFT));
	241	uint32_t *srcP =
	242	(uint32_t *) ((unsigned long)src + (page << PAGE_SHIFT));
	243
	244	int i;
	245	for (i = 0; i < PAGE_SIZE / sizeof(uint32_t); ++i)
	246	iowrite32(ioread32(srcP++), dstP++);
	247	return 0;
	248	}
	249
	250	static int ttm_copy_io_ttm_page(struct ttm_tt ttm, void src,
542c6f6d TH	251	unsigned long page,
542c6f6d TH	252	pgprot_t prot)
ba4e7d97	253	{
b1e5f172	254	struct page *d = ttm->pages[page];
ba4e7d97 TH	255	void *dst;
	256
	257	if (!d)
	258	return -ENOMEM;
	259
	260	src = (void *)((unsigned long)src + (page << PAGE_SHIFT));
542c6f6d TH	261
542c6f6d TH	262	#ifdef CONFIG_X86
3e4d3af5	263	dst = kmap_atomic_prot(d, prot);
542c6f6d	264	#else
6d0897ba	265	if (pgprot_val(prot) != pgprot_val(PAGE_KERNEL))
542c6f6d TH	266	dst = vmap(&d, 1, 0, prot);
	267	else
	268	dst = kmap(d);
	269	#endif
ba4e7d97 TH	270	if (!dst)
	271	return -ENOMEM;
	272
	273	memcpy_fromio(dst, src, PAGE_SIZE);
542c6f6d TH	274
542c6f6d TH	275	#ifdef CONFIG_X86
3e4d3af5	276	kunmap_atomic(dst);
542c6f6d	277	#else
6d0897ba	278	if (pgprot_val(prot) != pgprot_val(PAGE_KERNEL))
542c6f6d TH	279	vunmap(dst);
	280	else
	281	kunmap(d);
	282	#endif
	283
ba4e7d97 TH	284	return 0;
	285	}
	286
	287	static int ttm_copy_ttm_io_page(struct ttm_tt ttm, void dst,
542c6f6d TH	288	unsigned long page,
542c6f6d TH	289	pgprot_t prot)
ba4e7d97	290	{
b1e5f172	291	struct page *s = ttm->pages[page];
ba4e7d97 TH	292	void *src;
	293
	294	if (!s)
	295	return -ENOMEM;
	296
	297	dst = (void *)((unsigned long)dst + (page << PAGE_SHIFT));
542c6f6d	298	#ifdef CONFIG_X86
3e4d3af5	299	src = kmap_atomic_prot(s, prot);
542c6f6d	300	#else
6d0897ba	301	if (pgprot_val(prot) != pgprot_val(PAGE_KERNEL))
542c6f6d TH	302	src = vmap(&s, 1, 0, prot);
	303	else
	304	src = kmap(s);
	305	#endif
ba4e7d97 TH	306	if (!src)
	307	return -ENOMEM;
	308
	309	memcpy_toio(dst, src, PAGE_SIZE);
542c6f6d TH	310
542c6f6d TH	311	#ifdef CONFIG_X86
3e4d3af5	312	kunmap_atomic(src);
542c6f6d	313	#else
6d0897ba	314	if (pgprot_val(prot) != pgprot_val(PAGE_KERNEL))
542c6f6d TH	315	vunmap(src);
	316	else
	317	kunmap(s);
	318	#endif
	319
ba4e7d97 TH	320	return 0;
	321	}
	322
	323	int ttm_bo_move_memcpy(struct ttm_buffer_object *bo,
97a875cb	324	bool evict, bool no_wait_gpu,
9d87fa21	325	struct ttm_mem_reg *new_mem)
ba4e7d97 TH	326	{
	327	struct ttm_bo_device *bdev = bo->bdev;
	328	struct ttm_mem_type_manager *man = &bdev->man[new_mem->mem_type];
	329	struct ttm_tt *ttm = bo->ttm;
	330	struct ttm_mem_reg *old_mem = &bo->mem;
e22469ca	331	struct ttm_mem_reg old_copy = *old_mem;
ba4e7d97 TH	332	void *old_iomap;
	333	void *new_iomap;
	334	int ret;
ba4e7d97 TH	335	unsigned long i;
	336	unsigned long page;
	337	unsigned long add = 0;
	338	int dir;
	339
	340	ret = ttm_mem_reg_ioremap(bdev, old_mem, &old_iomap);
	341	if (ret)
	342	return ret;
	343	ret = ttm_mem_reg_ioremap(bdev, new_mem, &new_iomap);
	344	if (ret)
	345	goto out;
	346
da95c788 TH	347	/*
	348	* Single TTM move. NOP.
	349	*/
ba4e7d97 TH	350	if (old_iomap == NULL && new_iomap == NULL)
ba4e7d97 TH	351	goto out2;
da95c788 TH	352
da95c788 TH	353	/*
0bc25425	354	* Don't move nonexistent data. Clear destination instead.
da95c788	355	*/
0bc25425	356	if (old_iomap == NULL &&
2e6d8b46 TH	357	(ttm == NULL \|\| (ttm->state == tt_unpopulated &&
2e6d8b46 TH	358	!(ttm->page_flags & TTM_PAGE_FLAG_SWAPPED)))) {
0bc25425	359	memset_io(new_iomap, 0, new_mem->num_pages*PAGE_SIZE);
ba4e7d97	360	goto out2;
0bc25425	361	}
ba4e7d97	362
da95c788 TH	363	/*
da95c788 TH	364	* TTM might be null for moves within the same region.
9a0599dd JB	365	*/
9a0599dd JB	366	if (ttm && ttm->state == tt_unpopulated) {
b1e5f172	367	ret = ttm->bdev->driver->ttm_tt_populate(ttm);
da95c788	368	if (ret)
b1e5f172 JG	369	goto out1;
	370	}
	371
ba4e7d97 TH	372	add = 0;
	373	dir = 1;
	374
	375	if ((old_mem->mem_type == new_mem->mem_type) &&
d961db75	376	(new_mem->start < old_mem->start + old_mem->size)) {
ba4e7d97 TH	377	dir = -1;
	378	add = new_mem->num_pages - 1;
	379	}
	380
	381	for (i = 0; i < new_mem->num_pages; ++i) {
	382	page = i * dir + add;
542c6f6d TH	383	if (old_iomap == NULL) {
	384	pgprot_t prot = ttm_io_prot(old_mem->placement,
	385	PAGE_KERNEL);
	386	ret = ttm_copy_ttm_io_page(ttm, new_iomap, page,
	387	prot);
	388	} else if (new_iomap == NULL) {
	389	pgprot_t prot = ttm_io_prot(new_mem->placement,
	390	PAGE_KERNEL);
	391	ret = ttm_copy_io_ttm_page(ttm, old_iomap, page,
	392	prot);
	393	} else
ba4e7d97	394	ret = ttm_copy_io_page(new_iomap, old_iomap, page);
da95c788	395	if (ret)
ba4e7d97 TH	396	goto out1;
	397	}
	398	mb();
	399	out2:
eba67093	400	old_copy = *old_mem;
ba4e7d97 TH	401	old_mem = new_mem;
ba4e7d97 TH	402	new_mem->mm_node = NULL;
ba4e7d97 TH	403
	404	if ((man->flags & TTM_MEMTYPE_FLAG_FIXED) && (ttm != NULL)) {
	405	ttm_tt_unbind(ttm);
	406	ttm_tt_destroy(ttm);
	407	bo->ttm = NULL;
	408	}
	409
	410	out1:
eba67093	411	ttm_mem_reg_iounmap(bdev, old_mem, new_iomap);
ba4e7d97 TH	412	out:
ba4e7d97 TH	413	ttm_mem_reg_iounmap(bdev, &old_copy, old_iomap);
da95c788 TH	414
	415	/*
	416	* On error, keep the mm node!
	417	*/
	418	if (!ret)
	419	ttm_bo_mem_put(bo, &old_copy);
ba4e7d97 TH	420	return ret;
	421	}
	422	EXPORT_SYMBOL(ttm_bo_move_memcpy);
	423
	424	static void ttm_transfered_destroy(struct ttm_buffer_object *bo)
	425	{
	426	kfree(bo);
	427	}
	428
	429	/**
	430	* ttm_buffer_object_transfer
	431	*
	432	* @bo: A pointer to a struct ttm_buffer_object.
	433	* @new_obj: A pointer to a pointer to a newly created ttm_buffer_object,
	434	* holding the data of @bo with the old placement.
	435	*
	436	* This is a utility function that may be called after an accelerated move
	437	* has been scheduled. A new buffer object is created as a placeholder for
	438	* the old data while it's being copied. When that buffer object is idle,
	439	* it can be destroyed, releasing the space of the old placement.
	440	* Returns:
	441	* !0: Failure.
	442	*/
	443
	444	static int ttm_buffer_object_transfer(struct ttm_buffer_object *bo,
	445	struct ttm_buffer_object **new_obj)
	446	{
	447	struct ttm_buffer_object *fbo;
5e338405	448	int ret;
ba4e7d97	449
ff7c60c5	450	fbo = kmalloc(sizeof(*fbo), GFP_KERNEL);
ba4e7d97 TH	451	if (!fbo)
	452	return -ENOMEM;
	453
	454	fbo = bo;
	455
	456	/**
	457	* Fix up members that we shouldn't copy directly:
	458	* TODO: Explicit member copy would probably be better here.
	459	*/
	460
ba4e7d97 TH	461	INIT_LIST_HEAD(&fbo->ddestroy);
	462	INIT_LIST_HEAD(&fbo->lru);
	463	INIT_LIST_HEAD(&fbo->swap);
eba67093	464	INIT_LIST_HEAD(&fbo->io_reserve_lru);
72525b3f	465	drm_vma_node_reset(&fbo->vma_node);
0fbecd40	466	atomic_set(&fbo->cpu_writers, 0);
ba4e7d97	467
ba4e7d97 TH	468	kref_init(&fbo->list_kref);
	469	kref_init(&fbo->kref);
	470	fbo->destroy = &ttm_transfered_destroy;
57de4ba9	471	fbo->acc_size = 0;
5e338405 ML	472	fbo->resv = &fbo->ttm_resv;
	473	reservation_object_init(fbo->resv);
	474	ret = ww_mutex_trylock(&fbo->resv->lock);
	475	WARN_ON(!ret);
ba4e7d97 TH	476
	477	*new_obj = fbo;
	478	return 0;
	479	}
	480
	481	pgprot_t ttm_io_prot(uint32_t caching_flags, pgprot_t tmp)
	482	{
94318d50 BH	483	/* Cached mappings need no adjustment */
	484	if (caching_flags & TTM_PL_FLAG_CACHED)
	485	return tmp;
	486
ba4e7d97 TH	487	#if defined(__i386__) \|\| defined(__x86_64__)
	488	if (caching_flags & TTM_PL_FLAG_WC)
	489	tmp = pgprot_writecombine(tmp);
	490	else if (boot_cpu_data.x86 > 3)
	491	tmp = pgprot_noncached(tmp);
ba4e7d97	492	#endif
f135b978 AC	493	#if defined(__ia64__) \|\| defined(__arm__) \|\| defined(__aarch64__) \|\| \
f135b978 AC	494	defined(__powerpc__)
ba4e7d97 TH	495	if (caching_flags & TTM_PL_FLAG_WC)
	496	tmp = pgprot_writecombine(tmp);
	497	else
	498	tmp = pgprot_noncached(tmp);
	499	#endif
04cf55e1	500	#if defined(__sparc__) \|\| defined(__mips__)
94318d50	501	tmp = pgprot_noncached(tmp);
ba4e7d97 TH	502	#endif
	503	return tmp;
	504	}
4bfd75cb	505	EXPORT_SYMBOL(ttm_io_prot);
ba4e7d97 TH	506
ba4e7d97 TH	507	static int ttm_bo_ioremap(struct ttm_buffer_object *bo,
82c5da6b JG	508	unsigned long offset,
82c5da6b JG	509	unsigned long size,
ba4e7d97 TH	510	struct ttm_bo_kmap_obj *map)
ba4e7d97 TH	511	{
ba4e7d97	512	struct ttm_mem_reg *mem = &bo->mem;
ba4e7d97	513
82c5da6b	514	if (bo->mem.bus.addr) {
ba4e7d97	515	map->bo_kmap_type = ttm_bo_map_premapped;
82c5da6b	516	map->virtual = (void )(((u8 )bo->mem.bus.addr) + offset);
ba4e7d97 TH	517	} else {
	518	map->bo_kmap_type = ttm_bo_map_iomap;
	519	if (mem->placement & TTM_PL_FLAG_WC)
82c5da6b JG	520	map->virtual = ioremap_wc(bo->mem.bus.base + bo->mem.bus.offset + offset,
82c5da6b JG	521	size);
ba4e7d97	522	else
82c5da6b JG	523	map->virtual = ioremap_nocache(bo->mem.bus.base + bo->mem.bus.offset + offset,
82c5da6b JG	524	size);
ba4e7d97 TH	525	}
	526	return (!map->virtual) ? -ENOMEM : 0;
	527	}
	528
	529	static int ttm_bo_kmap_ttm(struct ttm_buffer_object *bo,
	530	unsigned long start_page,
	531	unsigned long num_pages,
	532	struct ttm_bo_kmap_obj *map)
	533	{
	534	struct ttm_mem_reg *mem = &bo->mem; pgprot_t prot;
	535	struct ttm_tt *ttm = bo->ttm;
b1e5f172	536	int ret;
ba4e7d97 TH	537
ba4e7d97 TH	538	BUG_ON(!ttm);
b1e5f172 JG	539
	540	if (ttm->state == tt_unpopulated) {
	541	ret = ttm->bdev->driver->ttm_tt_populate(ttm);
	542	if (ret)
	543	return ret;
	544	}
	545
ba4e7d97 TH	546	if (num_pages == 1 && (mem->placement & TTM_PL_FLAG_CACHED)) {
	547	/*
	548	* We're mapping a single page, and the desired
	549	* page protection is consistent with the bo.
	550	*/
	551
	552	map->bo_kmap_type = ttm_bo_map_kmap;
b1e5f172	553	map->page = ttm->pages[start_page];
ba4e7d97 TH	554	map->virtual = kmap(map->page);
ba4e7d97 TH	555	} else {
ba4e7d97 TH	556	/*
ba4e7d97 TH	557	* We need to use vmap to get the desired page protection
af901ca1	558	* or to make the buffer object look contiguous.
ba4e7d97	559	*/
94318d50	560	prot = ttm_io_prot(mem->placement, PAGE_KERNEL);
ba4e7d97 TH	561	map->bo_kmap_type = ttm_bo_map_vmap;
	562	map->virtual = vmap(ttm->pages + start_page, num_pages,
	563	0, prot);
	564	}
	565	return (!map->virtual) ? -ENOMEM : 0;
	566	}
	567
	568	int ttm_bo_kmap(struct ttm_buffer_object *bo,
	569	unsigned long start_page, unsigned long num_pages,
	570	struct ttm_bo_kmap_obj *map)
	571	{
eba67093 TH	572	struct ttm_mem_type_manager *man =
eba67093 TH	573	&bo->bdev->man[bo->mem.mem_type];
82c5da6b	574	unsigned long offset, size;
ba4e7d97	575	int ret;
ba4e7d97 TH	576
	577	BUG_ON(!list_empty(&bo->swap));
	578	map->virtual = NULL;
82c5da6b	579	map->bo = bo;
ba4e7d97 TH	580	if (num_pages > bo->num_pages)
	581	return -EINVAL;
	582	if (start_page > bo->num_pages)
	583	return -EINVAL;
	584	#if 0
4cda878b	585	if (num_pages > 1 && !capable(CAP_SYS_ADMIN))
ba4e7d97 TH	586	return -EPERM;
ba4e7d97 TH	587	#endif
eba67093	588	(void) ttm_mem_io_lock(man, false);
82c5da6b	589	ret = ttm_mem_io_reserve(bo->bdev, &bo->mem);
eba67093	590	ttm_mem_io_unlock(man);
ba4e7d97 TH	591	if (ret)
ba4e7d97 TH	592	return ret;
82c5da6b	593	if (!bo->mem.bus.is_iomem) {
ba4e7d97 TH	594	return ttm_bo_kmap_ttm(bo, start_page, num_pages, map);
ba4e7d97 TH	595	} else {
82c5da6b JG	596	offset = start_page << PAGE_SHIFT;
	597	size = num_pages << PAGE_SHIFT;
	598	return ttm_bo_ioremap(bo, offset, size, map);
ba4e7d97 TH	599	}
	600	}
	601	EXPORT_SYMBOL(ttm_bo_kmap);
	602
	603	void ttm_bo_kunmap(struct ttm_bo_kmap_obj *map)
	604	{
eba67093 TH	605	struct ttm_buffer_object *bo = map->bo;
	606	struct ttm_mem_type_manager *man =
	607	&bo->bdev->man[bo->mem.mem_type];
	608
ba4e7d97 TH	609	if (!map->virtual)
	610	return;
	611	switch (map->bo_kmap_type) {
	612	case ttm_bo_map_iomap:
	613	iounmap(map->virtual);
	614	break;
	615	case ttm_bo_map_vmap:
	616	vunmap(map->virtual);
	617	break;
	618	case ttm_bo_map_kmap:
	619	kunmap(map->page);
	620	break;
	621	case ttm_bo_map_premapped:
	622	break;
	623	default:
	624	BUG();
	625	}
eba67093 TH	626	(void) ttm_mem_io_lock(man, false);
	627	ttm_mem_io_free(map->bo->bdev, &map->bo->mem);
	628	ttm_mem_io_unlock(man);
ba4e7d97 TH	629	map->virtual = NULL;
	630	map->page = NULL;
	631	}
	632	EXPORT_SYMBOL(ttm_bo_kunmap);
	633
ba4e7d97	634	int ttm_bo_move_accel_cleanup(struct ttm_buffer_object *bo,
f2c24b83	635	struct fence *fence,
97a875cb	636	bool evict,
9d87fa21	637	bool no_wait_gpu,
ba4e7d97 TH	638	struct ttm_mem_reg *new_mem)
	639	{
	640	struct ttm_bo_device *bdev = bo->bdev;
ba4e7d97 TH	641	struct ttm_mem_type_manager *man = &bdev->man[new_mem->mem_type];
	642	struct ttm_mem_reg *old_mem = &bo->mem;
	643	int ret;
ba4e7d97	644	struct ttm_buffer_object *ghost_obj;
ba4e7d97	645
f2c24b83	646	reservation_object_add_excl_fence(bo->resv, fence);
ba4e7d97 TH	647	if (evict) {
ba4e7d97 TH	648	ret = ttm_bo_wait(bo, false, false, false);
ba4e7d97 TH	649	if (ret)
	650	return ret;
	651
ba4e7d97 TH	652	if ((man->flags & TTM_MEMTYPE_FLAG_FIXED) &&
	653	(bo->ttm != NULL)) {
	654	ttm_tt_unbind(bo->ttm);
	655	ttm_tt_destroy(bo->ttm);
	656	bo->ttm = NULL;
	657	}
eac20953	658	ttm_bo_free_old_node(bo);
ba4e7d97 TH	659	} else {
	660	/**
	661	* This should help pipeline ordinary buffer moves.
	662	*
	663	* Hang old buffer memory on a new buffer object,
	664	* and leave it to be released when the GPU
	665	* operation has completed.
	666	*/
	667
	668	set_bit(TTM_BO_PRIV_FLAG_MOVING, &bo->priv_flags);
ba4e7d97	669
ff7c60c5	670	ret = ttm_buffer_object_transfer(bo, &ghost_obj);
ba4e7d97 TH	671	if (ret)
	672	return ret;
	673
f2c24b83 ML	674	reservation_object_add_excl_fence(ghost_obj->resv, fence);
f2c24b83 ML	675
ba4e7d97 TH	676	/**
	677	* If we're not moving to fixed memory, the TTM object
	678	* needs to stay alive. Otherwhise hang it on the ghost
	679	* bo to be unbound and destroyed.
	680	*/
	681
	682	if (!(man->flags & TTM_MEMTYPE_FLAG_FIXED))
	683	ghost_obj->ttm = NULL;
	684	else
	685	bo->ttm = NULL;
	686
	687	ttm_bo_unreserve(ghost_obj);
	688	ttm_bo_unref(&ghost_obj);
	689	}
	690
	691	old_mem = new_mem;
	692	new_mem->mm_node = NULL;
110b20c3	693
ba4e7d97 TH	694	return 0;
	695	}
	696	EXPORT_SYMBOL(ttm_bo_move_accel_cleanup);