Adding upstream version 4.19.249.upstream/4.19.249

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 860 insertions, 0 deletions

diff --git a/drivers/gpu/drm/ttm/ttm_bo_util.c b/drivers/gpu/drm/ttm/ttm_bo_util.c
new file mode 100644
index 000000000..40904e84f
--- /dev/null
+++ b/drivers/gpu/drm/ttm/ttm_bo_util.c
@@ -0,0 +1,860 @@
+/* SPDX-License-Identifier: GPL-2.0 OR MIT */
+/**************************************************************************
+ *
+ * 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>
+
+struct ttm_transfer_obj {
+	struct ttm_buffer_object base;
+	struct ttm_buffer_object *bo;
+};
+
+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,
+		   struct ttm_operation_ctx *ctx,
+		    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) {
+		ret = ttm_bo_wait(bo, ctx->interruptible, ctx->no_wait_gpu);
+
+		if (unlikely(ret != 0)) {
+			if (ret != -ERESTARTSYS)
+				pr_err("Failed to expire sync object before unbinding TTM\n");
+			return ret;
+		}
+
+		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, ctx);
+		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;
+}
+
+#ifdef CONFIG_X86
+#define __ttm_kmap_atomic_prot(__page, __prot) kmap_atomic_prot(__page, __prot)
+#define __ttm_kunmap_atomic(__addr) kunmap_atomic(__addr)
+#else
+#define __ttm_kmap_atomic_prot(__page, __prot) vmap(&__page, 1, 0,  __prot)
+#define __ttm_kunmap_atomic(__addr) vunmap(__addr)
+#endif
+
+
+/**
+ * ttm_kmap_atomic_prot - Efficient kernel map of a single page with
+ * specified page protection.
+ *
+ * @page: The page to map.
+ * @prot: The page protection.
+ *
+ * This function maps a TTM page using the kmap_atomic api if available,
+ * otherwise falls back to vmap. The user must make sure that the
+ * specified page does not have an aliased mapping with a different caching
+ * policy unless the architecture explicitly allows it. Also mapping and
+ * unmapping using this api must be correctly nested. Unmapping should
+ * occur in the reverse order of mapping.
+ */
+void *ttm_kmap_atomic_prot(struct page *page, pgprot_t prot)
+{
+	if (pgprot_val(prot) == pgprot_val(PAGE_KERNEL))
+		return kmap_atomic(page);
+	else
+		return __ttm_kmap_atomic_prot(page, prot);
+}
+EXPORT_SYMBOL(ttm_kmap_atomic_prot);
+
+/**
+ * ttm_kunmap_atomic_prot - Unmap a page that was mapped using
+ * ttm_kmap_atomic_prot.
+ *
+ * @addr: The virtual address from the map.
+ * @prot: The page protection.
+ */
+void ttm_kunmap_atomic_prot(void *addr, pgprot_t prot)
+{
+	if (pgprot_val(prot) == pgprot_val(PAGE_KERNEL))
+		kunmap_atomic(addr);
+	else
+		__ttm_kunmap_atomic(addr);
+}
+EXPORT_SYMBOL(ttm_kunmap_atomic_prot);
+
+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));
+	dst = ttm_kmap_atomic_prot(d, prot);
+	if (!dst)
+		return -ENOMEM;
+
+	memcpy_fromio(dst, src, PAGE_SIZE);
+
+	ttm_kunmap_atomic_prot(dst, prot);
+
+	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));
+	src = ttm_kmap_atomic_prot(s, prot);
+	if (!src)
+		return -ENOMEM;
+
+	memcpy_toio(dst, src, PAGE_SIZE);
+
+	ttm_kunmap_atomic_prot(src, prot);
+
+	return 0;
+}
+
+int ttm_bo_move_memcpy(struct ttm_buffer_object *bo,
+		       struct ttm_operation_ctx *ctx,
+		       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_bo_wait(bo, ctx->interruptible, ctx->no_wait_gpu);
+	if (ret)
+		return ret;
+
+	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) {
+		ret = ttm_tt_populate(ttm, ctx);
+		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_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)
+{
+	struct ttm_transfer_obj *fbo;
+
+	fbo = container_of(bo, struct ttm_transfer_obj, base);
+	ttm_bo_put(fbo->bo);
+	kfree(fbo);
+}
+
+/**
+ * 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_transfer_obj *fbo;
+	int ret;
+
+	fbo = kmalloc(sizeof(*fbo), GFP_KERNEL);
+	if (!fbo)
+		return -ENOMEM;
+
+	fbo->base = *bo;
+	fbo->base.mem.placement |= TTM_PL_FLAG_NO_EVICT;
+
+	ttm_bo_get(bo);
+	fbo->bo = bo;
+
+	/**
+	 * Fix up members that we shouldn't copy directly:
+	 * TODO: Explicit member copy would probably be better here.
+	 */
+
+	atomic_inc(&bo->bdev->glob->bo_count);
+	INIT_LIST_HEAD(&fbo->base.ddestroy);
+	INIT_LIST_HEAD(&fbo->base.lru);
+	INIT_LIST_HEAD(&fbo->base.swap);
+	INIT_LIST_HEAD(&fbo->base.io_reserve_lru);
+	mutex_init(&fbo->base.wu_mutex);
+	fbo->base.moving = NULL;
+	drm_vma_node_reset(&fbo->base.vma_node);
+	atomic_set(&fbo->base.cpu_writers, 0);
+
+	kref_init(&fbo->base.list_kref);
+	kref_init(&fbo->base.kref);
+	fbo->base.destroy = &ttm_transfered_destroy;
+	fbo->base.acc_size = 0;
+	fbo->base.resv = &fbo->base.ttm_resv;
+	reservation_object_init(fbo->base.resv);
+	ret = reservation_object_trylock(fbo->base.resv);
+	WARN_ON(!ret);
+
+	*new_obj = &fbo->base;
+	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;
+	struct ttm_operation_ctx ctx = {
+		.interruptible = false,
+		.no_wait_gpu = false
+	};
+	struct ttm_tt *ttm = bo->ttm;
+	pgprot_t prot;
+	int ret;
+
+	BUG_ON(!ttm);
+
+	ret = ttm_tt_populate(ttm, &ctx);
+	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;
+
+	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 dma_fence *fence,
+			      bool evict,
+			      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);
+		if (ret)
+			return ret;
+
+		if (man->flags & TTM_MEMTYPE_FLAG_FIXED) {
+			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.
+		 */
+
+		dma_fence_put(bo->moving);
+		bo->moving = dma_fence_get(fence);
+
+		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_put(ghost_obj);
+	}
+
+	*old_mem = *new_mem;
+	new_mem->mm_node = NULL;
+
+	return 0;
+}
+EXPORT_SYMBOL(ttm_bo_move_accel_cleanup);
+
+int ttm_bo_pipeline_move(struct ttm_buffer_object *bo,
+			 struct dma_fence *fence, bool evict,
+			 struct ttm_mem_reg *new_mem)
+{
+	struct ttm_bo_device *bdev = bo->bdev;
+	struct ttm_mem_reg *old_mem = &bo->mem;
+
+	struct ttm_mem_type_manager *from = &bdev->man[old_mem->mem_type];
+	struct ttm_mem_type_manager *to = &bdev->man[new_mem->mem_type];
+
+	int ret;
+
+	reservation_object_add_excl_fence(bo->resv, fence);
+
+	if (!evict) {
+		struct ttm_buffer_object *ghost_obj;
+
+		/**
+		 * 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.
+		 */
+
+		dma_fence_put(bo->moving);
+		bo->moving = dma_fence_get(fence);
+
+		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 (!(to->flags & TTM_MEMTYPE_FLAG_FIXED))
+			ghost_obj->ttm = NULL;
+		else
+			bo->ttm = NULL;
+
+		ttm_bo_unreserve(ghost_obj);
+		ttm_bo_put(ghost_obj);
+
+	} else if (from->flags & TTM_MEMTYPE_FLAG_FIXED) {
+
+		/**
+		 * BO doesn't have a TTM we need to bind/unbind. Just remember
+		 * this eviction and free up the allocation
+		 */
+
+		spin_lock(&from->move_lock);
+		if (!from->move || dma_fence_is_later(fence, from->move)) {
+			dma_fence_put(from->move);
+			from->move = dma_fence_get(fence);
+		}
+		spin_unlock(&from->move_lock);
+
+		ttm_bo_free_old_node(bo);
+
+		dma_fence_put(bo->moving);
+		bo->moving = dma_fence_get(fence);
+
+	} else {
+		/**
+		 * Last resort, wait for the move to be completed.
+		 *
+		 * Should never happen in pratice.
+		 */
+
+		ret = ttm_bo_wait(bo, false, false);
+		if (ret)
+			return ret;
+
+		if (to->flags & TTM_MEMTYPE_FLAG_FIXED) {
+			ttm_tt_destroy(bo->ttm);
+			bo->ttm = NULL;
+		}
+		ttm_bo_free_old_node(bo);
+	}
+
+	*old_mem = *new_mem;
+	new_mem->mm_node = NULL;
+
+	return 0;
+}
+EXPORT_SYMBOL(ttm_bo_pipeline_move);
+
+int ttm_bo_pipeline_gutting(struct ttm_buffer_object *bo)
+{
+	struct ttm_buffer_object *ghost;
+	int ret;
+
+	ret = ttm_buffer_object_transfer(bo, &ghost);
+	if (ret)
+		return ret;
+
+	ret = reservation_object_copy_fences(ghost->resv, bo->resv);
+	/* Last resort, wait for the BO to be idle when we are OOM */
+	if (ret)
+		ttm_bo_wait(bo, false, false);
+
+	memset(&bo->mem, 0, sizeof(bo->mem));
+	bo->mem.mem_type = TTM_PL_SYSTEM;
+	bo->ttm = NULL;
+
+	ttm_bo_unreserve(ghost);
+	ttm_bo_put(ghost);
+
+	return 0;
+}