diff --git a/drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c b/drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c
index f5062d0c6333..de04ce4210b3 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c
@@ -12,6 +12,7 @@
 #include <asm/smp.h>
 
 #include "gem/i915_gem_dmabuf.h"
+#include "gem/i915_gem_ttm.h"
 #include "i915_drv.h"
 #include "i915_gem_object.h"
 #include "i915_scatterlist.h"
@@ -94,22 +95,25 @@ static int i915_gem_dmabuf_mmap(struct dma_buf *dma_buf, struct vm_area_struct *
 {
 	struct drm_i915_gem_object *obj = dma_buf_to_obj(dma_buf);
 	struct drm_i915_private *i915 = to_i915(obj->base.dev);
+	struct file *filp = i915_gem_ttm_get_filep(obj);
 	int ret;
 
+	GEM_BUG_ON(obj->base.import_attach != NULL);
+
 	if (obj->base.size < vma->vm_end - vma->vm_start)
 		return -EINVAL;
 
 	if (HAS_LMEM(i915))
 		return drm_gem_prime_mmap(&obj->base, vma);
 
-	if (!obj->base.filp)
+	if (!filp)
 		return -ENODEV;
 
-	ret = call_mmap(obj->base.filp, vma);
+	ret = call_mmap(filp, vma);
 	if (ret)
 		return ret;
 
-	vma_set_file(vma, obj->base.filp);
+	vma_set_file(vma, filp);
 
 	return 0;
 }
@@ -224,6 +228,8 @@ struct dma_buf *i915_gem_prime_export(struct drm_gem_object *gem_obj, int flags)
 	exp_info.priv = gem_obj;
 	exp_info.resv = obj->base.resv;
 
+	GEM_BUG_ON(obj->base.import_attach != NULL);
+
 	if (obj->ops->dmabuf_export) {
 		int ret = obj->ops->dmabuf_export(obj);
 		if (ret)
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_mman.c b/drivers/gpu/drm/i915/gem/i915_gem_mman.c
index 0c5c43852e24..d963cf35fdc9 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_mman.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_mman.c
@@ -64,7 +64,9 @@ i915_gem_mmap_ioctl(struct drm_device *dev, void *data,
 	struct drm_i915_private *i915 = to_i915(dev);
 	struct drm_i915_gem_mmap *args = data;
 	struct drm_i915_gem_object *obj;
+	struct file *filp;
 	unsigned long addr;
+	int ret;
 
 	/*
 	 * mmap ioctl is disallowed for all discrete platforms,
@@ -83,12 +85,20 @@ i915_gem_mmap_ioctl(struct drm_device *dev, void *data,
 	if (!obj)
 		return -ENOENT;
 
-	/* prime objects have no backing filp to GEM mmap
-	 * pages from.
-	 */
-	if (!obj->base.filp) {
-		addr = -ENXIO;
-		goto err;
+	if (obj->base.import_attach)
+		filp = obj->base.filp;
+	else {
+		ret = i915_gem_object_pin_pages_unlocked(obj);
+		if (ret) {
+			addr = ret;
+			goto err_pin;
+		}
+
+		filp = i915_gem_ttm_get_filep(obj);
+		if (!filp) {
+			addr = -ENXIO;
+			goto err;
+		}
 	}
 
 	if (range_overflows(args->offset, args->size, (u64)obj->base.size)) {
@@ -96,7 +106,7 @@ i915_gem_mmap_ioctl(struct drm_device *dev, void *data,
 		goto err;
 	}
 
-	addr = vm_mmap(obj->base.filp, 0, args->size,
+	addr = vm_mmap(filp, 0, args->size,
 		       PROT_READ | PROT_WRITE, MAP_SHARED,
 		       args->offset);
 	if (IS_ERR_VALUE(addr))
@@ -111,7 +121,7 @@ i915_gem_mmap_ioctl(struct drm_device *dev, void *data,
 			goto err;
 		}
 		vma = find_vma(mm, addr);
-		if (vma && __vma_matches(vma, obj->base.filp, addr, args->size))
+		if (vma && __vma_matches(vma, filp, addr, args->size))
 			vma->vm_page_prot =
 				pgprot_writecombine(vm_get_page_prot(vma->vm_flags));
 		else
@@ -120,12 +130,18 @@ i915_gem_mmap_ioctl(struct drm_device *dev, void *data,
 		if (IS_ERR_VALUE(addr))
 			goto err;
 	}
+	if (!obj->base.import_attach)
+		i915_gem_object_unpin_pages(obj);
+
 	i915_gem_object_put(obj);
 
 	args->addr_ptr = (u64)addr;
 	return 0;
 
 err:
+	if (!obj->base.import_attach)
+		i915_gem_object_unpin_pages(obj);
+err_pin:
 	i915_gem_object_put(obj);
 	return addr;
 }
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_object.h b/drivers/gpu/drm/i915/gem/i915_gem_object.h
index e11d82a9f7c3..a12f2733075a 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_object.h
+++ b/drivers/gpu/drm/i915/gem/i915_gem_object.h
@@ -592,7 +592,7 @@ i915_gem_object_invalidate_frontbuffer(struct drm_i915_gem_object *obj,
 
 int i915_gem_object_read_from_page(struct drm_i915_gem_object *obj, u64 offset, void *dst, int size);
 
-bool i915_gem_object_is_shmem(const struct drm_i915_gem_object *obj);
+bool i915_gem_object_is_shmem(struct drm_i915_gem_object *obj);
 
 void __i915_gem_free_object_rcu(struct rcu_head *head);
 
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_phys.c b/drivers/gpu/drm/i915/gem/i915_gem_phys.c
index 0d0e46dae559..af3c1c43000c 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_phys.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_phys.c
@@ -11,6 +11,7 @@
 #include <drm/drm_cache.h>
 
 #include "gt/intel_gt.h"
+#include "gem/i915_gem_ttm.h"
 #include "i915_drv.h"
 #include "i915_gem_object.h"
 #include "i915_gem_region.h"
@@ -19,7 +20,7 @@
 
 static int i915_gem_object_get_pages_phys(struct drm_i915_gem_object *obj)
 {
-	struct address_space *mapping = obj->base.filp->f_mapping;
+	struct address_space *mapping = i915_gem_ttm_get_filep(obj)->f_mapping;
 	struct drm_i915_private *i915 = to_i915(obj->base.dev);
 	struct scatterlist *sg;
 	struct sg_table *st;
@@ -28,6 +29,8 @@ static int i915_gem_object_get_pages_phys(struct drm_i915_gem_object *obj)
 	void *dst;
 	int i;
 
+	GEM_BUG_ON(obj->base.import_attach != NULL);
+
 	if (GEM_WARN_ON(i915_gem_object_needs_bit17_swizzle(obj)))
 		return -EINVAL;
 
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_shmem.c b/drivers/gpu/drm/i915/gem/i915_gem_shmem.c
index c2a3e388fcb4..343eb5897a36 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_shmem.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_shmem.c
@@ -11,12 +11,14 @@
 #include <drm/drm_cache.h>
 
 #include "gem/i915_gem_region.h"
+#include "gem/i915_gem_ttm.h"
 #include "i915_drv.h"
 #include "i915_gem_object.h"
 #include "i915_gem_tiling.h"
 #include "i915_gemfs.h"
 #include "i915_scatterlist.h"
 #include "i915_trace.h"
+#include "i915_gem_clflush.h"
 
 /*
  * Move pages to appropriate lru and release the pagevec, decrementing the
@@ -188,105 +190,6 @@ int shmem_sg_alloc_table(struct drm_i915_private *i915, struct sg_table *st,
 	return ret;
 }
 
-static int shmem_get_pages(struct drm_i915_gem_object *obj)
-{
-	struct drm_i915_private *i915 = to_i915(obj->base.dev);
-	struct intel_memory_region *mem = obj->mm.region;
-	struct address_space *mapping = obj->base.filp->f_mapping;
-	const unsigned long page_count = obj->base.size / PAGE_SIZE;
-	unsigned int max_segment = i915_sg_segment_size();
-	struct sg_table *st;
-	struct sgt_iter sgt_iter;
-	struct page *page;
-	int ret;
-
-	/*
-	 * Assert that the object is not currently in any GPU domain. As it
-	 * wasn't in the GTT, there shouldn't be any way it could have been in
-	 * a GPU cache
-	 */
-	GEM_BUG_ON(obj->read_domains & I915_GEM_GPU_DOMAINS);
-	GEM_BUG_ON(obj->write_domain & I915_GEM_GPU_DOMAINS);
-
-rebuild_st:
-	st = kmalloc(sizeof(*st), GFP_KERNEL);
-	if (!st)
-		return -ENOMEM;
-
-	ret = shmem_sg_alloc_table(i915, st, obj->base.size, mem, mapping,
-				   max_segment);
-	if (ret)
-		goto err_st;
-
-	ret = i915_gem_gtt_prepare_pages(obj, st);
-	if (ret) {
-		/*
-		 * DMA remapping failed? One possible cause is that
-		 * it could not reserve enough large entries, asking
-		 * for PAGE_SIZE chunks instead may be helpful.
-		 */
-		if (max_segment > PAGE_SIZE) {
-			for_each_sgt_page(page, sgt_iter, st)
-				put_page(page);
-			sg_free_table(st);
-			kfree(st);
-
-			max_segment = PAGE_SIZE;
-			goto rebuild_st;
-		} else {
-			dev_warn(i915->drm.dev,
-				 "Failed to DMA remap %lu pages\n",
-				 page_count);
-			goto err_pages;
-		}
-	}
-
-	if (i915_gem_object_needs_bit17_swizzle(obj))
-		i915_gem_object_do_bit_17_swizzle(obj, st);
-
-	if (i915_gem_object_can_bypass_llc(obj))
-		obj->cache_dirty = true;
-
-	__i915_gem_object_set_pages(obj, st, i915_sg_dma_sizes(st->sgl));
-
-	return 0;
-
-err_pages:
-	shmem_sg_free_table(st, mapping, false, false);
-	/*
-	 * shmemfs first checks if there is enough memory to allocate the page
-	 * and reports ENOSPC should there be insufficient, along with the usual
-	 * ENOMEM for a genuine allocation failure.
-	 *
-	 * We use ENOSPC in our driver to mean that we have run out of aperture
-	 * space and so want to translate the error from shmemfs back to our
-	 * usual understanding of ENOMEM.
-	 */
-err_st:
-	if (ret == -ENOSPC)
-		ret = -ENOMEM;
-
-	kfree(st);
-
-	return ret;
-}
-
-static int
-shmem_truncate(struct drm_i915_gem_object *obj)
-{
-	/*
-	 * Our goal here is to return as much of the memory as
-	 * is possible back to the system as we are called from OOM.
-	 * To do this we must instruct the shmfs to drop all of its
-	 * backing pages, *now*.
-	 */
-	shmem_truncate_range(file_inode(obj->base.filp), 0, (loff_t)-1);
-	obj->mm.madv = __I915_MADV_PURGED;
-	obj->mm.pages = ERR_PTR(-EFAULT);
-
-	return 0;
-}
-
 void __shmem_writeback(size_t size, struct address_space *mapping)
 {
 	struct writeback_control wbc = {
@@ -329,27 +232,6 @@ void __shmem_writeback(size_t size, struct address_space *mapping)
 	}
 }
 
-static void
-shmem_writeback(struct drm_i915_gem_object *obj)
-{
-	__shmem_writeback(obj->base.size, obj->base.filp->f_mapping);
-}
-
-static int shmem_shrink(struct drm_i915_gem_object *obj, unsigned int flags)
-{
-	switch (obj->mm.madv) {
-	case I915_MADV_DONTNEED:
-		return i915_gem_object_truncate(obj);
-	case __I915_MADV_PURGED:
-		return 0;
-	}
-
-	if (flags & I915_GEM_OBJECT_SHRINK_WRITEBACK)
-		shmem_writeback(obj);
-
-	return 0;
-}
-
 void
 __i915_gem_object_release_shmem(struct drm_i915_gem_object *obj,
 				struct sg_table *pages,
@@ -395,220 +277,6 @@ void i915_gem_object_put_pages_shmem(struct drm_i915_gem_object *obj, struct sg_
 	obj->mm.dirty = false;
 }
 
-static void
-shmem_put_pages(struct drm_i915_gem_object *obj, struct sg_table *pages)
-{
-	if (likely(i915_gem_object_has_struct_page(obj)))
-		i915_gem_object_put_pages_shmem(obj, pages);
-	else
-		i915_gem_object_put_pages_phys(obj, pages);
-}
-
-static int
-shmem_pwrite(struct drm_i915_gem_object *obj,
-	     const struct drm_i915_gem_pwrite *arg)
-{
-	struct address_space *mapping = obj->base.filp->f_mapping;
-	char __user *user_data = u64_to_user_ptr(arg->data_ptr);
-	u64 remain, offset;
-	unsigned int pg;
-
-	/* Caller already validated user args */
-	GEM_BUG_ON(!access_ok(user_data, arg->size));
-
-	if (!i915_gem_object_has_struct_page(obj))
-		return i915_gem_object_pwrite_phys(obj, arg);
-
-	/*
-	 * Before we instantiate/pin the backing store for our use, we
-	 * can prepopulate the shmemfs filp efficiently using a write into
-	 * the pagecache. We avoid the penalty of instantiating all the
-	 * pages, important if the user is just writing to a few and never
-	 * uses the object on the GPU, and using a direct write into shmemfs
-	 * allows it to avoid the cost of retrieving a page (either swapin
-	 * or clearing-before-use) before it is overwritten.
-	 */
-	if (i915_gem_object_has_pages(obj))
-		return -ENODEV;
-
-	if (obj->mm.madv != I915_MADV_WILLNEED)
-		return -EFAULT;
-
-	/*
-	 * Before the pages are instantiated the object is treated as being
-	 * in the CPU domain. The pages will be clflushed as required before
-	 * use, and we can freely write into the pages directly. If userspace
-	 * races pwrite with any other operation; corruption will ensue -
-	 * that is userspace's prerogative!
-	 */
-
-	remain = arg->size;
-	offset = arg->offset;
-	pg = offset_in_page(offset);
-
-	do {
-		unsigned int len, unwritten;
-		struct page *page;
-		void *data, *vaddr;
-		int err;
-		char c;
-
-		len = PAGE_SIZE - pg;
-		if (len > remain)
-			len = remain;
-
-		/* Prefault the user page to reduce potential recursion */
-		err = __get_user(c, user_data);
-		if (err)
-			return err;
-
-		err = __get_user(c, user_data + len - 1);
-		if (err)
-			return err;
-
-		err = pagecache_write_begin(obj->base.filp, mapping,
-					    offset, len, 0,
-					    &page, &data);
-		if (err < 0)
-			return err;
-
-		vaddr = kmap_atomic(page);
-		unwritten = __copy_from_user_inatomic(vaddr + pg,
-						      user_data,
-						      len);
-		kunmap_atomic(vaddr);
-
-		err = pagecache_write_end(obj->base.filp, mapping,
-					  offset, len, len - unwritten,
-					  page, data);
-		if (err < 0)
-			return err;
-
-		/* We don't handle -EFAULT, leave it to the caller to check */
-		if (unwritten)
-			return -ENODEV;
-
-		remain -= len;
-		user_data += len;
-		offset += len;
-		pg = 0;
-	} while (remain);
-
-	return 0;
-}
-
-static int
-shmem_pread(struct drm_i915_gem_object *obj,
-	    const struct drm_i915_gem_pread *arg)
-{
-	if (!i915_gem_object_has_struct_page(obj))
-		return i915_gem_object_pread_phys(obj, arg);
-
-	return -ENODEV;
-}
-
-static void shmem_release(struct drm_i915_gem_object *obj)
-{
-	if (i915_gem_object_has_struct_page(obj))
-		i915_gem_object_release_memory_region(obj);
-
-	fput(obj->base.filp);
-}
-
-const struct drm_i915_gem_object_ops i915_gem_shmem_ops = {
-	.name = "i915_gem_object_shmem",
-	.flags = I915_GEM_OBJECT_IS_SHRINKABLE,
-
-	.get_pages = shmem_get_pages,
-	.put_pages = shmem_put_pages,
-	.truncate = shmem_truncate,
-	.shrink = shmem_shrink,
-
-	.pwrite = shmem_pwrite,
-	.pread = shmem_pread,
-
-	.release = shmem_release,
-};
-
-static int __create_shmem(struct drm_i915_private *i915,
-			  struct drm_gem_object *obj,
-			  resource_size_t size)
-{
-	unsigned long flags = VM_NORESERVE;
-	struct file *filp;
-
-	drm_gem_private_object_init(&i915->drm, obj, size);
-
-	if (i915->mm.gemfs)
-		filp = shmem_file_setup_with_mnt(i915->mm.gemfs, "i915", size,
-						 flags);
-	else
-		filp = shmem_file_setup("i915", size, flags);
-	if (IS_ERR(filp))
-		return PTR_ERR(filp);
-
-	obj->filp = filp;
-	return 0;
-}
-
-static int shmem_object_init(struct intel_memory_region *mem,
-			     struct drm_i915_gem_object *obj,
-			     resource_size_t offset,
-			     resource_size_t size,
-			     resource_size_t page_size,
-			     unsigned int flags)
-{
-	static struct lock_class_key lock_class;
-	struct drm_i915_private *i915 = mem->i915;
-	struct address_space *mapping;
-	unsigned int cache_level;
-	gfp_t mask;
-	int ret;
-
-	ret = __create_shmem(i915, &obj->base, size);
-	if (ret)
-		return ret;
-
-	mask = GFP_HIGHUSER | __GFP_RECLAIMABLE;
-	if (IS_I965GM(i915) || IS_I965G(i915)) {
-		/* 965gm cannot relocate objects above 4GiB. */
-		mask &= ~__GFP_HIGHMEM;
-		mask |= __GFP_DMA32;
-	}
-
-	mapping = obj->base.filp->f_mapping;
-	mapping_set_gfp_mask(mapping, mask);
-	GEM_BUG_ON(!(mapping_gfp_mask(mapping) & __GFP_RECLAIM));
-
-	i915_gem_object_init(obj, &i915_gem_shmem_ops, &lock_class, 0);
-	obj->mem_flags |= I915_BO_FLAG_STRUCT_PAGE;
-	obj->write_domain = I915_GEM_DOMAIN_CPU;
-	obj->read_domains = I915_GEM_DOMAIN_CPU;
-
-	if (HAS_LLC(i915))
-		/* On some devices, we can have the GPU use the LLC (the CPU
-		 * cache) for about a 10% performance improvement
-		 * compared to uncached.  Graphics requests other than
-		 * display scanout are coherent with the CPU in
-		 * accessing this cache.  This means in this mode we
-		 * don't need to clflush on the CPU side, and on the
-		 * GPU side we only need to flush internal caches to
-		 * get data visible to the CPU.
-		 *
-		 * However, we maintain the display planes as UC, and so
-		 * need to rebind when first used as such.
-		 */
-		cache_level = I915_CACHE_LLC;
-	else
-		cache_level = I915_CACHE_NONE;
-
-	i915_gem_object_set_cache_coherency(obj, cache_level);
-
-	i915_gem_object_init_memory_region(obj, mem);
-
-	return 0;
-}
-
 struct drm_i915_gem_object *
 i915_gem_object_create_shmem(struct drm_i915_private *i915,
 			     resource_size_t size)
@@ -634,7 +302,19 @@ i915_gem_object_create_shmem_from_data(struct drm_i915_private *dev_priv,
 
 	GEM_BUG_ON(obj->write_domain != I915_GEM_DOMAIN_CPU);
 
-	file = obj->base.filp;
+	/*
+	 *  When using TTM as the main GEM backend, we need to pin the pages
+	 *  after creating the object to access the file pointer
+	 */
+	err = i915_gem_object_pin_pages_unlocked(obj);
+	if (err) {
+		drm_dbg(&dev_priv->drm, "%s pin-pages err=%d\n", __func__, err);
+		goto fail_pin;
+	}
+
+	file = i915_gem_ttm_get_filep(obj);
+	GEM_WARN_ON(file == NULL);
+
 	offset = 0;
 	do {
 		unsigned int len = min_t(typeof(size), size, PAGE_SIZE);
@@ -662,51 +342,14 @@ i915_gem_object_create_shmem_from_data(struct drm_i915_private *dev_priv,
 		offset += len;
 	} while (size);
 
+	i915_gem_clflush_object(obj, I915_CLFLUSH_SYNC);
+	i915_gem_object_unpin_pages(obj);
+
 	return obj;
 
 fail:
+	i915_gem_object_unpin_pages(obj);
+fail_pin:
 	i915_gem_object_put(obj);
 	return ERR_PTR(err);
 }
-
-static int init_shmem(struct intel_memory_region *mem)
-{
-	int err;
-
-	err = i915_gemfs_init(mem->i915);
-	if (err) {
-		DRM_NOTE("Unable to create a private tmpfs mount, hugepage support will be disabled(%d).\n",
-			 err);
-	}
-
-	intel_memory_region_set_name(mem, "system");
-
-	return 0; /* Don't error, we can simply fallback to the kernel mnt */
-}
-
-static int release_shmem(struct intel_memory_region *mem)
-{
-	i915_gemfs_fini(mem->i915);
-	return 0;
-}
-
-static const struct intel_memory_region_ops shmem_region_ops = {
-	.init = init_shmem,
-	.release = release_shmem,
-	.init_object = shmem_object_init,
-};
-
-struct intel_memory_region *i915_gem_shmem_setup(struct drm_i915_private *i915,
-						 u16 type, u16 instance)
-{
-	return intel_memory_region_create(i915, 0,
-					  totalram_pages() << PAGE_SHIFT,
-					  PAGE_SIZE, 0, 0,
-					  type, instance,
-					  &shmem_region_ops);
-}
-
-bool i915_gem_object_is_shmem(const struct drm_i915_gem_object *obj)
-{
-	return obj->ops == &i915_gem_shmem_ops;
-}
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_ttm.c b/drivers/gpu/drm/i915/gem/i915_gem_ttm.c
index 4c25d9b2f138..e4f3a467abd8 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_ttm.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_ttm.c
@@ -21,6 +21,7 @@
 #include "gem/i915_gem_ttm_move.h"
 #include "gem/i915_gem_ttm_pm.h"
 #include "gt/intel_gpu_commands.h"
+#include "gem/i915_gem_tiling.h"
 
 #define I915_TTM_PRIO_PURGE     0
 #define I915_TTM_PRIO_NO_PAGES  1
@@ -37,6 +38,7 @@
  * @ttm: The base TTM page vector.
  * @dev: The struct device used for dma mapping and unmapping.
  * @cached_rsgt: The cached scatter-gather table.
+ * @bo: TTM buffer object this ttm_tt structure is bound to.
  * @is_shmem: Set if using shmem.
  * @filp: The shmem file, if using shmem backend.
  *
@@ -50,6 +52,7 @@ struct i915_ttm_tt {
 	struct ttm_tt ttm;
 	struct device *dev;
 	struct i915_refct_sgt cached_rsgt;
+	struct ttm_buffer_object *bo;
 
 	bool is_shmem;
 	struct file *filp;
@@ -113,6 +116,10 @@ static int i915_ttm_err_to_gem(int err)
 static enum ttm_caching
 i915_ttm_select_tt_caching(const struct drm_i915_gem_object *obj)
 {
+	struct drm_i915_private *i915 = to_i915(obj->base.dev);
+
+	if (GRAPHICS_VER(i915) <= 5)
+		return ttm_uncached;
 	/*
 	 * Objects only allowed in system get cached cpu-mappings, or when
 	 * evicting lmem-only buffers to system for swapping. Other objects get
@@ -207,6 +214,11 @@ static int i915_ttm_tt_shmem_populate(struct ttm_device *bdev,
 			return PTR_ERR(filp);
 
 		mask = GFP_HIGHUSER | __GFP_RECLAIMABLE;
+		if (IS_I965GM(i915) || IS_I965G(i915)) {
+			/* 965gm cannot relocate objects above 4GiB. */
+			mask &= ~__GFP_HIGHMEM;
+			mask |= __GFP_DMA32;
+		}
 
 		mapping = filp->f_mapping;
 		mapping_set_gfp_mask(mapping, mask);
@@ -304,12 +316,14 @@ static struct ttm_tt *i915_ttm_tt_create(struct ttm_buffer_object *bo,
 	if (!i915_tt)
 		return NULL;
 
+	i915_tt->bo = bo;
+
 	if (obj->flags & I915_BO_ALLOC_CPU_CLEAR &&
 	    man->use_tt)
 		page_flags |= TTM_TT_FLAG_ZERO_ALLOC;
 
 	caching = i915_ttm_select_tt_caching(obj);
-	if (i915_gem_object_is_shrinkable(obj) && caching == ttm_cached) {
+	if (i915_gem_object_is_shrinkable(obj) && (caching != ttm_write_combined)) {
 		page_flags |= TTM_TT_FLAG_EXTERNAL |
 			      TTM_TT_FLAG_EXTERNAL_MAPPABLE;
 		i915_tt->is_shmem = true;
@@ -352,11 +366,19 @@ static void i915_ttm_tt_unpopulate(struct ttm_device *bdev, struct ttm_tt *ttm)
 {
 	struct i915_ttm_tt *i915_tt = container_of(ttm, typeof(*i915_tt), ttm);
 	struct sg_table *st = &i915_tt->cached_rsgt.table;
+	struct ttm_buffer_object *bo = i915_tt->bo;
+	struct drm_i915_gem_object *obj = i915_ttm_to_gem(bo);
+
+	if (i915_tt->is_shmem)
+		__i915_gem_object_release_shmem(obj, st, true);
 
 	if (st->sgl)
 		dma_unmap_sgtable(i915_tt->dev, st, DMA_BIDIRECTIONAL, 0);
 
 	if (i915_tt->is_shmem) {
+		if (i915_gem_object_needs_bit17_swizzle(obj))
+			i915_gem_object_save_bit_17_swizzle(obj, st);
+
 		i915_ttm_tt_shmem_unpopulate(ttm);
 	} else {
 		sg_free_table(st);
@@ -798,6 +820,12 @@ static int __i915_ttm_get_pages(struct drm_i915_gem_object *obj,
 		obj->mm.rsgt = rsgt;
 		__i915_gem_object_set_pages(obj, &rsgt->table,
 					    i915_sg_dma_sizes(rsgt->table.sgl));
+
+		if (i915_gem_object_needs_bit17_swizzle(obj))
+			i915_gem_object_save_bit_17_swizzle(obj, &rsgt->table);
+
+		if (i915_gem_object_can_bypass_llc(obj))
+			obj->cache_dirty = true;
 	}
 
 	GEM_BUG_ON(bo->ttm && ((obj->base.size >> PAGE_SHIFT) < bo->ttm->num_pages));
@@ -979,6 +1007,119 @@ void i915_ttm_adjust_lru(struct drm_i915_gem_object *obj)
 	spin_unlock(&bo->bdev->lru_lock);
 }
 
+static int
+i915_ttm_pwrite(struct drm_i915_gem_object *obj,
+		const struct drm_i915_gem_pwrite *arg)
+{
+	struct drm_i915_private *i915 = to_i915(obj->base.dev);
+	char __user *user_data = u64_to_user_ptr(arg->data_ptr);
+	struct address_space *mapping;
+	u64 remain, offset;
+	struct file *filp;
+	unsigned int pg;
+	int err;
+
+	/* Caller already validated user args */
+	GEM_BUG_ON(!access_ok(user_data, arg->size));
+
+	if (!i915_gem_object_has_struct_page(obj))
+		return i915_gem_object_pwrite_phys(obj, arg);
+
+	/*
+	 * We need to pin the pages in order to have access to the filp
+	 * given by shmem, quite unlike in the legacy GEM shmem backend
+	 * where it would be available upon object creation
+	 */
+	err = i915_gem_object_pin_pages_unlocked(obj);
+	if (err) {
+		drm_dbg(&i915->drm, "%s pin-pages err=%d\n", __func__, err);
+		return err;
+	}
+
+	filp = i915_gem_ttm_get_filep(obj);
+	if (!filp) {
+		err = -ENXIO;
+		goto error;
+	}
+
+	mapping = filp->f_mapping;
+
+	if (obj->mm.madv != I915_MADV_WILLNEED) {
+		err = -EFAULT;
+		goto error;
+	}
+
+	/*
+	 * Before the pages are instantiated the object is treated as being
+	 * in the CPU domain. The pages will be clflushed as required before
+	 * use, and we can freely write into the pages directly. If userspace
+	 * races pwrite with any other operation; corruption will ensue -
+	 * that is userspace's prerogative!
+	 */
+
+	remain = arg->size;
+	offset = arg->offset;
+	pg = offset_in_page(offset);
+
+	do {
+		unsigned int len, unwritten;
+		struct page *page;
+		void *data, *vaddr;
+		int err;
+		char c;
+
+		len = PAGE_SIZE - pg;
+		if (len > remain)
+			len = remain;
+
+		/* Prefault the user page to reduce potential recursion */
+		err = __get_user(c, user_data);
+		if (err)
+			goto error;
+
+		err = __get_user(c, user_data + len - 1);
+		if (err)
+			goto error;
+
+		err = pagecache_write_begin(obj->base.filp, mapping,
+					    offset, len, 0,
+					    &page, &data);
+		if (err < 0)
+			goto error;
+
+		vaddr = kmap_atomic(page);
+		unwritten = __copy_from_user_inatomic(vaddr + pg,
+						      user_data,
+						      len);
+		kunmap_atomic(vaddr);
+
+		err = pagecache_write_end(obj->base.filp, mapping,
+					  offset, len, len - unwritten,
+					  page, data);
+		if (err < 0)
+			goto error;
+
+		/* We don't handle -EFAULT, leave it to the caller to check */
+		if (unwritten) {
+			err = -ENODEV;
+			goto error;
+		}
+
+		remain -= len;
+		user_data += len;
+		offset += len;
+		pg = 0;
+	} while (remain);
+
+	i915_gem_object_unpin_pages(obj);
+
+	return 0;
+
+error:
+	i915_gem_object_unpin_pages(obj);
+	return err;
+}
+
 /*
  * TTM-backed gem object destruction requires some clarification.
  * Basically we have two possibilities here. We can either rely on the
@@ -1120,7 +1261,7 @@ static void i915_ttm_unmap_virtual(struct drm_i915_gem_object *obj)
 	ttm_bo_unmap_virtual(i915_gem_to_ttm(obj));
 }
 
-static const struct drm_i915_gem_object_ops i915_gem_ttm_obj_ops = {
+static const struct drm_i915_gem_object_ops i915_gem_ttm_discrete_ops = {
 	.name = "i915_gem_object_ttm",
 	.flags = I915_GEM_OBJECT_IS_SHRINKABLE |
 		 I915_GEM_OBJECT_SELF_MANAGED_SHRINK_LIST,
@@ -1139,6 +1280,22 @@ static const struct drm_i915_gem_object_ops i915_gem_ttm_obj_ops = {
 	.mmap_ops = &vm_ops_ttm,
 };
 
+static const struct drm_i915_gem_object_ops i915_gem_ttm_obj_integrated_ops = {
+	.name = "i915_gem_object_ttm",
+	.flags = I915_GEM_OBJECT_IS_SHRINKABLE |
+		 I915_GEM_OBJECT_SELF_MANAGED_SHRINK_LIST,
+
+	.get_pages = i915_ttm_get_pages,
+	.put_pages = i915_ttm_put_pages,
+	.truncate = i915_ttm_truncate,
+	.shrink = i915_ttm_shrink,
+
+	.pwrite = i915_ttm_pwrite,
+
+	.adjust_lru = i915_ttm_adjust_lru,
+	.delayed_free = i915_ttm_delayed_free,
+};
+
 void i915_ttm_bo_destroy(struct ttm_buffer_object *bo)
 {
 	struct drm_i915_gem_object *obj = i915_ttm_to_gem(bo);
@@ -1196,7 +1353,12 @@ int __i915_gem_ttm_object_init(struct intel_memory_region *mem,
 	int ret;
 
 	drm_gem_private_object_init(&i915->drm, &obj->base, size);
-	i915_gem_object_init(obj, &i915_gem_ttm_obj_ops, &lock_class, flags);
+
+	if (IS_DGFX(i915))
+		i915_gem_object_init(obj, &i915_gem_ttm_discrete_ops, &lock_class, flags);
+	else
+		i915_gem_object_init(obj, &i915_gem_ttm_obj_integrated_ops, &lock_class,
+				     flags);
 
 	obj->bo_offset = offset;
 
@@ -1206,8 +1368,8 @@ int __i915_gem_ttm_object_init(struct intel_memory_region *mem,
 
 	INIT_RADIX_TREE(&obj->ttm.get_io_page.radix, GFP_KERNEL | __GFP_NOWARN);
 	mutex_init(&obj->ttm.get_io_page.lock);
-	bo_type = (obj->flags & I915_BO_ALLOC_USER) ? ttm_bo_type_device :
-		ttm_bo_type_kernel;
+	bo_type = (obj->ops->mmap_offset && (obj->flags & I915_BO_ALLOC_USER)) ?
+		ttm_bo_type_device : ttm_bo_type_kernel;
 
 	obj->base.vma_node.driver_private = i915_gem_to_ttm(obj);
 
@@ -1251,6 +1413,27 @@ static const struct intel_memory_region_ops ttm_system_region_ops = {
 	.release = intel_region_ttm_fini,
 };
 
+/**
+ * Return: filp.
+ */
+struct file *
+i915_gem_ttm_get_filep(struct drm_i915_gem_object *obj)
+{
+	struct drm_device *dev = obj->base.dev;
+	struct ttm_buffer_object *bo;
+	struct i915_ttm_tt *i915_tt;
+
+	bo = i915_gem_to_ttm(obj);
+	if (!bo->ttm) {
+		drm_dbg(dev, "ttm has not been allocated for bo\n");
+		return NULL;
+	}
+
+	i915_tt = container_of(bo->ttm, typeof(*i915_tt), ttm);
+
+	return i915_tt->filp;
+}
+
 struct intel_memory_region *
 i915_gem_ttm_system_setup(struct drm_i915_private *i915,
 			  u16 type, u16 instance)
@@ -1268,3 +1451,22 @@ i915_gem_ttm_system_setup(struct drm_i915_private *i915,
 	intel_memory_region_set_name(mr, "system-ttm");
 	return mr;
 }
+
+bool i915_gem_object_is_shmem(struct drm_i915_gem_object *obj)
+{
+	struct intel_memory_region *mr = READ_ONCE(obj->mm.region);
+
+#ifdef CONFIG_LOCKDEP
+	if (i915_gem_object_migratable(obj) &&
+	    i915_gem_object_evictable(obj))
+		assert_object_held(obj);
+#endif
+
+	/* Review list of placements to make sure object isn't migratable */
+	if (i915_gem_object_placement_possible(obj, INTEL_MEMORY_LOCAL))
+		return false;
+
+	return mr && (mr->type == INTEL_MEMORY_SYSTEM &&
+		      (obj->ops == &i915_gem_ttm_obj_integrated_ops ||
+		       obj->ops == &i915_gem_ttm_discrete_ops));
+}
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_ttm.h b/drivers/gpu/drm/i915/gem/i915_gem_ttm.h
index 73e371aa3850..f00f18db5a8b 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_ttm.h
+++ b/drivers/gpu/drm/i915/gem/i915_gem_ttm.h
@@ -92,4 +92,7 @@ static inline bool i915_ttm_cpu_maps_iomem(struct ttm_resource *mem)
 	/* Once / if we support GGTT, this is also false for cached ttm_tts */
 	return mem->mem_type != I915_PL_SYSTEM;
 }
+
+struct file *i915_gem_ttm_get_filep(struct drm_i915_gem_object *obj);
+
 #endif
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_ttm_move.c b/drivers/gpu/drm/i915/gem/i915_gem_ttm_move.c
index a10716f4e717..c588e31aa479 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_ttm_move.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_ttm_move.c
@@ -46,6 +46,10 @@ static enum i915_cache_level
 i915_ttm_cache_level(struct drm_i915_private *i915, struct ttm_resource *res,
 		     struct ttm_tt *ttm)
 {
+
+	if (GRAPHICS_VER(i915) <= 5)
+		return I915_CACHE_NONE;
+
 	return ((HAS_LLC(i915) || HAS_SNOOP(i915)) &&
 		!i915_ttm_gtt_binds_lmem(res) &&
 		ttm->caching == ttm_cached) ? I915_CACHE_LLC :
@@ -77,7 +81,12 @@ void i915_ttm_adjust_domains_after_move(struct drm_i915_gem_object *obj)
 {
 	struct ttm_buffer_object *bo = i915_gem_to_ttm(obj);
 
-	if (i915_ttm_cpu_maps_iomem(bo->resource) || bo->ttm->caching != ttm_cached) {
+	if (!i915_ttm_cpu_maps_iomem(bo->resource) &&
+	    bo->ttm->caching == ttm_uncached) {
+		obj->write_domain = I915_GEM_DOMAIN_CPU;
+		obj->read_domains = I915_GEM_DOMAIN_CPU;
+	} else if (i915_ttm_cpu_maps_iomem(bo->resource) ||
+		 bo->ttm->caching != ttm_cached) {
 		obj->write_domain = I915_GEM_DOMAIN_WC;
 		obj->read_domains = I915_GEM_DOMAIN_WC;
 	} else {
diff --git a/drivers/gpu/drm/i915/gt/shmem_utils.c b/drivers/gpu/drm/i915/gt/shmem_utils.c
index 402f085f3a02..4f842094e484 100644
--- a/drivers/gpu/drm/i915/gt/shmem_utils.c
+++ b/drivers/gpu/drm/i915/gt/shmem_utils.c
@@ -10,6 +10,9 @@
 
 #include "gem/i915_gem_object.h"
 #include "gem/i915_gem_lmem.h"
+#include "gem/i915_gem_ttm.h"
+
+#include "i915_drv.h"
 #include "shmem_utils.h"
 
 struct file *shmem_create_from_data(const char *name, void *data, size_t len)
@@ -30,24 +33,65 @@ struct file *shmem_create_from_data(const char *name, void *data, size_t len)
 	return file;
 }
 
+static int shmem_flush_object(struct file *file, unsigned long num_pages)
+{
+	struct page *page;
+	unsigned long pfn;
+
+	for (pfn = 0; pfn < num_pages; pfn++) {
+		page = shmem_read_mapping_page_gfp(file->f_mapping, pfn,
+						   GFP_KERNEL);
+		if (IS_ERR(page))
+			return PTR_ERR(page);
+
+		set_page_dirty(page);
+		mark_page_accessed(page);
+		kunmap(page);
+		put_page(page);
+	}
+
+	return 0;
+}
+
 struct file *shmem_create_from_object(struct drm_i915_gem_object *obj)
 {
+	struct drm_i915_private *i915 = to_i915(obj->base.dev);
 	struct file *file;
 	void *ptr;
+	int err;
 
 	if (i915_gem_object_is_shmem(obj)) {
-		file = obj->base.filp;
-		atomic_long_inc(&file->f_count);
-		return file;
-	}
 
-	ptr = i915_gem_object_pin_map_unlocked(obj, i915_gem_object_is_lmem(obj) ?
-						I915_MAP_WC : I915_MAP_WB);
-	if (IS_ERR(ptr))
-		return ERR_CAST(ptr);
+		GEM_BUG_ON(!i915_gem_object_has_pages(obj));
 
-	file = shmem_create_from_data("", ptr, obj->base.size);
-	i915_gem_object_unpin_map(obj);
+		err = i915_gem_object_pin_pages_unlocked(obj);
+		if (err) {
+			drm_dbg(&i915->drm, "%s pin-pages err=%d\n", __func__,
+				err);
+			return ERR_PTR(err);
+		}
+
+		file = i915_gem_ttm_get_filep(obj);
+		GEM_BUG_ON(!file);
+
+		err = shmem_flush_object(file, obj->base.size >> PAGE_SHIFT);
+		if (err) {
+			drm_dbg(&i915->drm, "shmem_flush_object failed\n");
+			i915_gem_object_unpin_pages(obj);
+			return ERR_PTR(err);
+		}
+
+		atomic_long_inc(&file->f_count);
+		i915_gem_object_unpin_pages(obj);
+	} else {
+		ptr = i915_gem_object_pin_map_unlocked(obj, i915_gem_object_is_lmem(obj) ?
+						       I915_MAP_WC : I915_MAP_WB);
+		if (IS_ERR(ptr))
+			return ERR_CAST(ptr);
+
+		file = shmem_create_from_data("", ptr, obj->base.size);
+		i915_gem_object_unpin_map(obj);
+	}
 
 	return file;
 }
diff --git a/drivers/gpu/drm/i915/intel_memory_region.c b/drivers/gpu/drm/i915/intel_memory_region.c
index e38d2db1c3e3..82b6684d7e60 100644
--- a/drivers/gpu/drm/i915/intel_memory_region.c
+++ b/drivers/gpu/drm/i915/intel_memory_region.c
@@ -309,12 +309,7 @@ int intel_memory_regions_hw_probe(struct drm_i915_private *i915)
 		instance = intel_region_map[i].instance;
 		switch (type) {
 		case INTEL_MEMORY_SYSTEM:
-			if (IS_DGFX(i915))
-				mem = i915_gem_ttm_system_setup(i915, type,
-								instance);
-			else
-				mem = i915_gem_shmem_setup(i915, type,
-							   instance);
+			mem = i915_gem_ttm_system_setup(i915, type, instance);
 			break;
 		case INTEL_MEMORY_STOLEN_LOCAL:
 			mem = i915_gem_stolen_lmem_setup(i915, type, instance);
