Merge branch 'drm-next' of git://people.freedesktop.org/~airlied/linux

Pull drm updates from Dave Airlie:
 "This is the main drm pull request for v4.2.

  I've one other new driver from freescale on my radar, it's been posted
  and reviewed, I'd just like to get someone to give it a last look, so
  maybe I'll send it or maybe I'll leave it.

  There is no major nouveau changes in here, Ben was working on
  something big, and we agreed it was a bit late, there wasn't anything
  else he considered urgent to merge.

  There might be another msm pull for some bits that are waiting on
  arm-soc, I'll see how we time it.

  This touches some "of" stuff, acks are in place except for the fixes
  to the build in various configs,t hat I just applied.

  Summary:

  New drivers:
      - virtio-gpu:
                KMS only pieces of driver for virtio-gpu in qemu.
                This is just the first part of this driver, enough to run
                unaccelerated userspace on. As qemu merges more we'll start
                adding the 3D features for the virgl 3d work.
      - amdgpu:
                a new driver from AMD to driver their newer GPUs. (VI+)
                It contains a new cleaner userspace API, and is a clean
                break from radeon moving forward, that AMD are going to
                concentrate on. It also contains a set of register headers
                auto generated from AMD internal database.

  core:
      - atomic modesetting API completed, enabled by default now.
      - Add support for mode_id blob to atomic ioctl to complete interface.
      - bunch of Displayport MST fixes
      - lots of misc fixes.

  panel:
      - new simple panels
      - fix some long-standing build issues with bridge drivers

  radeon:
      - VCE1 support
      - add a GPU reset counter for userspace
      - lots of fixes.

  amdkfd:
      - H/W debugger support module
      - static user-mode queues
      - support killing all the waves when a process terminates
      - use standard DECLARE_BITMAP

  i915:
      - Add Broxton support
      - S3, rotation support for Skylake
      - RPS booting tuning
      - CPT modeset sequence fixes
      - ns2501 dither support
      - enable cmd parser on haswell
      - cdclk handling fixes
      - gen8 dynamic pte allocation
      - lots of atomic conversion work

  exynos:
      - Add atomic modesetting support
      - Add iommu support
      - Consolidate drm driver initialization
      - and MIC, DECON and MIPI-DSI support for exynos5433

  omapdrm:
      - atomic modesetting support (fixes lots of things in rewrite)

  tegra:
      - DP aux transaction fixes
      - iommu support fix

  msm:
      - adreno a306 support
      - various dsi bits
      - various 64-bit fixes
      - NV12MT support

  rcar-du:
      - atomic and misc fixes

  sti:
      - fix HDMI timing complaince

  tilcdc:
      - use drm component API to access tda998x driver
      - fix module unloading

  qxl:
      - stability fixes"

* 'drm-next' of git://people.freedesktop.org/~airlied/linux: (872 commits)
  drm/nouveau: Pause between setting gpu to D3hot and cutting the power
  drm/dp/mst: close deadlock in connector destruction.
  drm: Always enable atomic API
  drm/vgem: Set unique to "vgem"
  of: fix a build error to of_graph_get_endpoint_by_regs function
  drm/dp/mst: take lock around looking up the branch device on hpd irq
  drm/dp/mst: make sure mst_primary mstb is valid in work function
  of: add EXPORT_SYMBOL for of_graph_get_endpoint_by_regs
  ARM: dts: rename the clock of MIPI DSI 'pll_clk' to 'sclk_mipi'
  drm/atomic: Don't set crtc_state->enable manually
  drm/exynos: dsi: do not set TE GPIO direction by input
  drm/exynos: dsi: add support for MIC driver as a bridge
  drm/exynos: dsi: add support for Exynos5433
  drm/exynos: dsi: make use of array for clock access
  drm/exynos: dsi: make use of driver data for static values
  drm/exynos: dsi: add macros for register access
  drm/exynos: dsi: rename pll_clk to sclk_clk
  drm/exynos: mic: add MIC driver
  of: add helper for getting endpoint node of specific identifiers
  drm/exynos: add Exynos5433 decon driver
  ...

1 files changed, 1215 insertions, 0 deletions

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
new file mode 100644
index 000000000000..d3706a498293
--- /dev/null
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
@@ -0,0 +1,1215 @@
+/*
+ * Copyright 2009 Jerome Glisse.
+ * 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 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.
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial portions
+ * of the Software.
+ *
+ */
+/*
+ * Authors:
+ *    Jerome Glisse <glisse@freedesktop.org>
+ *    Thomas Hellstrom <thomas-at-tungstengraphics-dot-com>
+ *    Dave Airlie
+ */
+#include <ttm/ttm_bo_api.h>
+#include <ttm/ttm_bo_driver.h>
+#include <ttm/ttm_placement.h>
+#include <ttm/ttm_module.h>
+#include <ttm/ttm_page_alloc.h>
+#include <drm/drmP.h>
+#include <drm/amdgpu_drm.h>
+#include <linux/seq_file.h>
+#include <linux/slab.h>
+#include <linux/swiotlb.h>
+#include <linux/swap.h>
+#include <linux/pagemap.h>
+#include <linux/debugfs.h>
+#include "amdgpu.h"
+#include "bif/bif_4_1_d.h"
+
+#define DRM_FILE_PAGE_OFFSET (0x100000000ULL >> PAGE_SHIFT)
+
+static int amdgpu_ttm_debugfs_init(struct amdgpu_device *adev);
+static void amdgpu_ttm_debugfs_fini(struct amdgpu_device *adev);
+
+static struct amdgpu_device *amdgpu_get_adev(struct ttm_bo_device *bdev)
+{
+	struct amdgpu_mman *mman;
+	struct amdgpu_device *adev;
+
+	mman = container_of(bdev, struct amdgpu_mman, bdev);
+	adev = container_of(mman, struct amdgpu_device, mman);
+	return adev;
+}
+
+
+/*
+ * Global memory.
+ */
+static int amdgpu_ttm_mem_global_init(struct drm_global_reference *ref)
+{
+	return ttm_mem_global_init(ref->object);
+}
+
+static void amdgpu_ttm_mem_global_release(struct drm_global_reference *ref)
+{
+	ttm_mem_global_release(ref->object);
+}
+
+static int amdgpu_ttm_global_init(struct amdgpu_device *adev)
+{
+	struct drm_global_reference *global_ref;
+	int r;
+
+	adev->mman.mem_global_referenced = false;
+	global_ref = &adev->mman.mem_global_ref;
+	global_ref->global_type = DRM_GLOBAL_TTM_MEM;
+	global_ref->size = sizeof(struct ttm_mem_global);
+	global_ref->init = &amdgpu_ttm_mem_global_init;
+	global_ref->release = &amdgpu_ttm_mem_global_release;
+	r = drm_global_item_ref(global_ref);
+	if (r != 0) {
+		DRM_ERROR("Failed setting up TTM memory accounting "
+			  "subsystem.\n");
+		return r;
+	}
+
+	adev->mman.bo_global_ref.mem_glob =
+		adev->mman.mem_global_ref.object;
+	global_ref = &adev->mman.bo_global_ref.ref;
+	global_ref->global_type = DRM_GLOBAL_TTM_BO;
+	global_ref->size = sizeof(struct ttm_bo_global);
+	global_ref->init = &ttm_bo_global_init;
+	global_ref->release = &ttm_bo_global_release;
+	r = drm_global_item_ref(global_ref);
+	if (r != 0) {
+		DRM_ERROR("Failed setting up TTM BO subsystem.\n");
+		drm_global_item_unref(&adev->mman.mem_global_ref);
+		return r;
+	}
+
+	adev->mman.mem_global_referenced = true;
+	return 0;
+}
+
+static void amdgpu_ttm_global_fini(struct amdgpu_device *adev)
+{
+	if (adev->mman.mem_global_referenced) {
+		drm_global_item_unref(&adev->mman.bo_global_ref.ref);
+		drm_global_item_unref(&adev->mman.mem_global_ref);
+		adev->mman.mem_global_referenced = false;
+	}
+}
+
+static int amdgpu_invalidate_caches(struct ttm_bo_device *bdev, uint32_t flags)
+{
+	return 0;
+}
+
+static int amdgpu_init_mem_type(struct ttm_bo_device *bdev, uint32_t type,
+				struct ttm_mem_type_manager *man)
+{
+	struct amdgpu_device *adev;
+
+	adev = amdgpu_get_adev(bdev);
+
+	switch (type) {
+	case TTM_PL_SYSTEM:
+		/* System memory */
+		man->flags = TTM_MEMTYPE_FLAG_MAPPABLE;
+		man->available_caching = TTM_PL_MASK_CACHING;
+		man->default_caching = TTM_PL_FLAG_CACHED;
+		break;
+	case TTM_PL_TT:
+		man->func = &ttm_bo_manager_func;
+		man->gpu_offset = adev->mc.gtt_start;
+		man->available_caching = TTM_PL_MASK_CACHING;
+		man->default_caching = TTM_PL_FLAG_CACHED;
+		man->flags = TTM_MEMTYPE_FLAG_MAPPABLE | TTM_MEMTYPE_FLAG_CMA;
+		break;
+	case TTM_PL_VRAM:
+		/* "On-card" video ram */
+		man->func = &ttm_bo_manager_func;
+		man->gpu_offset = adev->mc.vram_start;
+		man->flags = TTM_MEMTYPE_FLAG_FIXED |
+			     TTM_MEMTYPE_FLAG_MAPPABLE;
+		man->available_caching = TTM_PL_FLAG_UNCACHED | TTM_PL_FLAG_WC;
+		man->default_caching = TTM_PL_FLAG_WC;
+		break;
+	case AMDGPU_PL_GDS:
+	case AMDGPU_PL_GWS:
+	case AMDGPU_PL_OA:
+		/* On-chip GDS memory*/
+		man->func = &ttm_bo_manager_func;
+		man->gpu_offset = 0;
+		man->flags = TTM_MEMTYPE_FLAG_FIXED | TTM_MEMTYPE_FLAG_CMA;
+		man->available_caching = TTM_PL_FLAG_UNCACHED;
+		man->default_caching = TTM_PL_FLAG_UNCACHED;
+		break;
+	default:
+		DRM_ERROR("Unsupported memory type %u\n", (unsigned)type);
+		return -EINVAL;
+	}
+	return 0;
+}
+
+static void amdgpu_evict_flags(struct ttm_buffer_object *bo,
+				struct ttm_placement *placement)
+{
+	struct amdgpu_bo *rbo;
+	static struct ttm_place placements = {
+		.fpfn = 0,
+		.lpfn = 0,
+		.flags = TTM_PL_MASK_CACHING | TTM_PL_FLAG_SYSTEM
+	};
+
+	if (!amdgpu_ttm_bo_is_amdgpu_bo(bo)) {
+		placement->placement = &placements;
+		placement->busy_placement = &placements;
+		placement->num_placement = 1;
+		placement->num_busy_placement = 1;
+		return;
+	}
+	rbo = container_of(bo, struct amdgpu_bo, tbo);
+	switch (bo->mem.mem_type) {
+	case TTM_PL_VRAM:
+		if (rbo->adev->mman.buffer_funcs_ring->ready == false)
+			amdgpu_ttm_placement_from_domain(rbo, AMDGPU_GEM_DOMAIN_CPU);
+		else
+			amdgpu_ttm_placement_from_domain(rbo, AMDGPU_GEM_DOMAIN_GTT);
+		break;
+	case TTM_PL_TT:
+	default:
+		amdgpu_ttm_placement_from_domain(rbo, AMDGPU_GEM_DOMAIN_CPU);
+	}
+	*placement = rbo->placement;
+}
+
+static int amdgpu_verify_access(struct ttm_buffer_object *bo, struct file *filp)
+{
+	struct amdgpu_bo *rbo = container_of(bo, struct amdgpu_bo, tbo);
+
+	return drm_vma_node_verify_access(&rbo->gem_base.vma_node, filp);
+}
+
+static void amdgpu_move_null(struct ttm_buffer_object *bo,
+			     struct ttm_mem_reg *new_mem)
+{
+	struct ttm_mem_reg *old_mem = &bo->mem;
+
+	BUG_ON(old_mem->mm_node != NULL);
+	*old_mem = *new_mem;
+	new_mem->mm_node = NULL;
+}
+
+static int amdgpu_move_blit(struct ttm_buffer_object *bo,
+			bool evict, bool no_wait_gpu,
+			struct ttm_mem_reg *new_mem,
+			struct ttm_mem_reg *old_mem)
+{
+	struct amdgpu_device *adev;
+	struct amdgpu_ring *ring;
+	uint64_t old_start, new_start;
+	struct amdgpu_fence *fence;
+	int r;
+
+	adev = amdgpu_get_adev(bo->bdev);
+	ring = adev->mman.buffer_funcs_ring;
+	old_start = old_mem->start << PAGE_SHIFT;
+	new_start = new_mem->start << PAGE_SHIFT;
+
+	switch (old_mem->mem_type) {
+	case TTM_PL_VRAM:
+		old_start += adev->mc.vram_start;
+		break;
+	case TTM_PL_TT:
+		old_start += adev->mc.gtt_start;
+		break;
+	default:
+		DRM_ERROR("Unknown placement %d\n", old_mem->mem_type);
+		return -EINVAL;
+	}
+	switch (new_mem->mem_type) {
+	case TTM_PL_VRAM:
+		new_start += adev->mc.vram_start;
+		break;
+	case TTM_PL_TT:
+		new_start += adev->mc.gtt_start;
+		break;
+	default:
+		DRM_ERROR("Unknown placement %d\n", old_mem->mem_type);
+		return -EINVAL;
+	}
+	if (!ring->ready) {
+		DRM_ERROR("Trying to move memory with ring turned off.\n");
+		return -EINVAL;
+	}
+
+	BUILD_BUG_ON((PAGE_SIZE % AMDGPU_GPU_PAGE_SIZE) != 0);
+
+	r = amdgpu_copy_buffer(ring, old_start, new_start,
+			       new_mem->num_pages * PAGE_SIZE, /* bytes */
+			       bo->resv, &fence);
+	/* FIXME: handle copy error */
+	r = ttm_bo_move_accel_cleanup(bo, &fence->base,
+				      evict, no_wait_gpu, new_mem);
+	amdgpu_fence_unref(&fence);
+	return r;
+}
+
+static int amdgpu_move_vram_ram(struct ttm_buffer_object *bo,
+				bool evict, bool interruptible,
+				bool no_wait_gpu,
+				struct ttm_mem_reg *new_mem)
+{
+	struct amdgpu_device *adev;
+	struct ttm_mem_reg *old_mem = &bo->mem;
+	struct ttm_mem_reg tmp_mem;
+	struct ttm_place placements;
+	struct ttm_placement placement;
+	int r;
+
+	adev = amdgpu_get_adev(bo->bdev);
+	tmp_mem = *new_mem;
+	tmp_mem.mm_node = NULL;
+	placement.num_placement = 1;
+	placement.placement = &placements;
+	placement.num_busy_placement = 1;
+	placement.busy_placement = &placements;
+	placements.fpfn = 0;
+	placements.lpfn = 0;
+	placements.flags = TTM_PL_MASK_CACHING | TTM_PL_FLAG_TT;
+	r = ttm_bo_mem_space(bo, &placement, &tmp_mem,
+			     interruptible, no_wait_gpu);
+	if (unlikely(r)) {
+		return r;
+	}
+
+	r = ttm_tt_set_placement_caching(bo->ttm, tmp_mem.placement);
+	if (unlikely(r)) {
+		goto out_cleanup;
+	}
+
+	r = ttm_tt_bind(bo->ttm, &tmp_mem);
+	if (unlikely(r)) {
+		goto out_cleanup;
+	}
+	r = amdgpu_move_blit(bo, true, no_wait_gpu, &tmp_mem, old_mem);
+	if (unlikely(r)) {
+		goto out_cleanup;
+	}
+	r = ttm_bo_move_ttm(bo, true, no_wait_gpu, new_mem);
+out_cleanup:
+	ttm_bo_mem_put(bo, &tmp_mem);
+	return r;
+}
+
+static int amdgpu_move_ram_vram(struct ttm_buffer_object *bo,
+				bool evict, bool interruptible,
+				bool no_wait_gpu,
+				struct ttm_mem_reg *new_mem)
+{
+	struct amdgpu_device *adev;
+	struct ttm_mem_reg *old_mem = &bo->mem;
+	struct ttm_mem_reg tmp_mem;
+	struct ttm_placement placement;
+	struct ttm_place placements;
+	int r;
+
+	adev = amdgpu_get_adev(bo->bdev);
+	tmp_mem = *new_mem;
+	tmp_mem.mm_node = NULL;
+	placement.num_placement = 1;
+	placement.placement = &placements;
+	placement.num_busy_placement = 1;
+	placement.busy_placement = &placements;
+	placements.fpfn = 0;
+	placements.lpfn = 0;
+	placements.flags = TTM_PL_MASK_CACHING | TTM_PL_FLAG_TT;
+	r = ttm_bo_mem_space(bo, &placement, &tmp_mem,
+			     interruptible, no_wait_gpu);
+	if (unlikely(r)) {
+		return r;
+	}
+	r = ttm_bo_move_ttm(bo, true, no_wait_gpu, &tmp_mem);
+	if (unlikely(r)) {
+		goto out_cleanup;
+	}
+	r = amdgpu_move_blit(bo, true, no_wait_gpu, new_mem, old_mem);
+	if (unlikely(r)) {
+		goto out_cleanup;
+	}
+out_cleanup:
+	ttm_bo_mem_put(bo, &tmp_mem);
+	return r;
+}
+
+static int amdgpu_bo_move(struct ttm_buffer_object *bo,
+			bool evict, bool interruptible,
+			bool no_wait_gpu,
+			struct ttm_mem_reg *new_mem)
+{
+	struct amdgpu_device *adev;
+	struct ttm_mem_reg *old_mem = &bo->mem;
+	int r;
+
+	adev = amdgpu_get_adev(bo->bdev);
+	if (old_mem->mem_type == TTM_PL_SYSTEM && bo->ttm == NULL) {
+		amdgpu_move_null(bo, new_mem);
+		return 0;
+	}
+	if ((old_mem->mem_type == TTM_PL_TT &&
+	     new_mem->mem_type == TTM_PL_SYSTEM) ||
+	    (old_mem->mem_type == TTM_PL_SYSTEM &&
+	     new_mem->mem_type == TTM_PL_TT)) {
+		/* bind is enough */
+		amdgpu_move_null(bo, new_mem);
+		return 0;
+	}
+	if (adev->mman.buffer_funcs == NULL ||
+	    adev->mman.buffer_funcs_ring == NULL ||
+	    !adev->mman.buffer_funcs_ring->ready) {
+		/* use memcpy */
+		goto memcpy;
+	}
+
+	if (old_mem->mem_type == TTM_PL_VRAM &&
+	    new_mem->mem_type == TTM_PL_SYSTEM) {
+		r = amdgpu_move_vram_ram(bo, evict, interruptible,
+					no_wait_gpu, new_mem);
+	} else if (old_mem->mem_type == TTM_PL_SYSTEM &&
+		   new_mem->mem_type == TTM_PL_VRAM) {
+		r = amdgpu_move_ram_vram(bo, evict, interruptible,
+					    no_wait_gpu, new_mem);
+	} else {
+		r = amdgpu_move_blit(bo, evict, no_wait_gpu, new_mem, old_mem);
+	}
+
+	if (r) {
+memcpy:
+		r = ttm_bo_move_memcpy(bo, evict, no_wait_gpu, new_mem);
+		if (r) {
+			return r;
+		}
+	}
+
+	/* update statistics */
+	atomic64_add((u64)bo->num_pages << PAGE_SHIFT, &adev->num_bytes_moved);
+	return 0;
+}
+
+static int amdgpu_ttm_io_mem_reserve(struct ttm_bo_device *bdev, struct ttm_mem_reg *mem)
+{
+	struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
+	struct amdgpu_device *adev = amdgpu_get_adev(bdev);
+
+	mem->bus.addr = NULL;
+	mem->bus.offset = 0;
+	mem->bus.size = mem->num_pages << PAGE_SHIFT;
+	mem->bus.base = 0;
+	mem->bus.is_iomem = false;
+	if (!(man->flags & TTM_MEMTYPE_FLAG_MAPPABLE))
+		return -EINVAL;
+	switch (mem->mem_type) {
+	case TTM_PL_SYSTEM:
+		/* system memory */
+		return 0;
+	case TTM_PL_TT:
+		break;
+	case TTM_PL_VRAM:
+		mem->bus.offset = mem->start << PAGE_SHIFT;
+		/* check if it's visible */
+		if ((mem->bus.offset + mem->bus.size) > adev->mc.visible_vram_size)
+			return -EINVAL;
+		mem->bus.base = adev->mc.aper_base;
+		mem->bus.is_iomem = true;
+#ifdef __alpha__
+		/*
+		 * Alpha: use bus.addr to hold the ioremap() return,
+		 * so we can modify bus.base below.
+		 */
+		if (mem->placement & TTM_PL_FLAG_WC)
+			mem->bus.addr =
+				ioremap_wc(mem->bus.base + mem->bus.offset,
+					   mem->bus.size);
+		else
+			mem->bus.addr =
+				ioremap_nocache(mem->bus.base + mem->bus.offset,
+						mem->bus.size);
+
+		/*
+		 * Alpha: Use just the bus offset plus
+		 * the hose/domain memory base for bus.base.
+		 * It then can be used to build PTEs for VRAM
+		 * access, as done in ttm_bo_vm_fault().
+		 */
+		mem->bus.base = (mem->bus.base & 0x0ffffffffUL) +
+			adev->ddev->hose->dense_mem_base;
+#endif
+		break;
+	default:
+		return -EINVAL;
+	}
+	return 0;
+}
+
+static void amdgpu_ttm_io_mem_free(struct ttm_bo_device *bdev, struct ttm_mem_reg *mem)
+{
+}
+
+/*
+ * TTM backend functions.
+ */
+struct amdgpu_ttm_tt {
+	struct ttm_dma_tt		ttm;
+	struct amdgpu_device		*adev;
+	u64				offset;
+	uint64_t			userptr;
+	struct mm_struct		*usermm;
+	uint32_t			userflags;
+};
+
+/* prepare the sg table with the user pages */
+static int amdgpu_ttm_tt_pin_userptr(struct ttm_tt *ttm)
+{
+	struct amdgpu_device *adev = amdgpu_get_adev(ttm->bdev);
+	struct amdgpu_ttm_tt *gtt = (void *)ttm;
+	unsigned pinned = 0, nents;
+	int r;
+
+	int write = !(gtt->userflags & AMDGPU_GEM_USERPTR_READONLY);
+	enum dma_data_direction direction = write ?
+		DMA_BIDIRECTIONAL : DMA_TO_DEVICE;
+
+	if (current->mm != gtt->usermm)
+		return -EPERM;
+
+	if (gtt->userflags & AMDGPU_GEM_USERPTR_ANONONLY) {
+		/* check that we only pin down anonymous memory
+		   to prevent problems with writeback */
+		unsigned long end = gtt->userptr + ttm->num_pages * PAGE_SIZE;
+		struct vm_area_struct *vma;
+
+		vma = find_vma(gtt->usermm, gtt->userptr);
+		if (!vma || vma->vm_file || vma->vm_end < end)
+			return -EPERM;
+	}
+
+	do {
+		unsigned num_pages = ttm->num_pages - pinned;
+		uint64_t userptr = gtt->userptr + pinned * PAGE_SIZE;
+		struct page **pages = ttm->pages + pinned;
+
+		r = get_user_pages(current, current->mm, userptr, num_pages,
+				   write, 0, pages, NULL);
+		if (r < 0)
+			goto release_pages;
+
+		pinned += r;
+
+	} while (pinned < ttm->num_pages);
+
+	r = sg_alloc_table_from_pages(ttm->sg, ttm->pages, ttm->num_pages, 0,
+				      ttm->num_pages << PAGE_SHIFT,
+				      GFP_KERNEL);
+	if (r)
+		goto release_sg;
+
+	r = -ENOMEM;
+	nents = dma_map_sg(adev->dev, ttm->sg->sgl, ttm->sg->nents, direction);
+	if (nents != ttm->sg->nents)
+		goto release_sg;
+
+	drm_prime_sg_to_page_addr_arrays(ttm->sg, ttm->pages,
+					 gtt->ttm.dma_address, ttm->num_pages);
+
+	return 0;
+
+release_sg:
+	kfree(ttm->sg);
+
+release_pages:
+	release_pages(ttm->pages, pinned, 0);
+	return r;
+}
+
+static void amdgpu_ttm_tt_unpin_userptr(struct ttm_tt *ttm)
+{
+	struct amdgpu_device *adev = amdgpu_get_adev(ttm->bdev);
+	struct amdgpu_ttm_tt *gtt = (void *)ttm;
+	struct sg_page_iter sg_iter;
+
+	int write = !(gtt->userflags & AMDGPU_GEM_USERPTR_READONLY);
+	enum dma_data_direction direction = write ?
+		DMA_BIDIRECTIONAL : DMA_TO_DEVICE;
+
+	/* double check that we don't free the table twice */
+	if (!ttm->sg->sgl)
+		return;
+
+	/* free the sg table and pages again */
+	dma_unmap_sg(adev->dev, ttm->sg->sgl, ttm->sg->nents, direction);
+
+	for_each_sg_page(ttm->sg->sgl, &sg_iter, ttm->sg->nents, 0) {
+		struct page *page = sg_page_iter_page(&sg_iter);
+		if (!(gtt->userflags & AMDGPU_GEM_USERPTR_READONLY))
+			set_page_dirty(page);
+
+		mark_page_accessed(page);
+		page_cache_release(page);
+	}
+
+	sg_free_table(ttm->sg);
+}
+
+static int amdgpu_ttm_backend_bind(struct ttm_tt *ttm,
+				   struct ttm_mem_reg *bo_mem)
+{
+	struct amdgpu_ttm_tt *gtt = (void*)ttm;
+	uint32_t flags = amdgpu_ttm_tt_pte_flags(gtt->adev, ttm, bo_mem);
+	int r;
+
+	if (gtt->userptr)
+		amdgpu_ttm_tt_pin_userptr(ttm);
+
+	gtt->offset = (unsigned long)(bo_mem->start << PAGE_SHIFT);
+	if (!ttm->num_pages) {
+		WARN(1, "nothing to bind %lu pages for mreg %p back %p!\n",
+		     ttm->num_pages, bo_mem, ttm);
+	}
+
+	if (bo_mem->mem_type == AMDGPU_PL_GDS ||
+	    bo_mem->mem_type == AMDGPU_PL_GWS ||
+	    bo_mem->mem_type == AMDGPU_PL_OA)
+		return -EINVAL;
+
+	r = amdgpu_gart_bind(gtt->adev, gtt->offset, ttm->num_pages,
+		ttm->pages, gtt->ttm.dma_address, flags);
+
+	if (r) {
+		DRM_ERROR("failed to bind %lu pages at 0x%08X\n",
+			  ttm->num_pages, (unsigned)gtt->offset);
+		return r;
+	}
+	return 0;
+}
+
+static int amdgpu_ttm_backend_unbind(struct ttm_tt *ttm)
+{
+	struct amdgpu_ttm_tt *gtt = (void *)ttm;
+
+	/* unbind shouldn't be done for GDS/GWS/OA in ttm_bo_clean_mm */
+	if (gtt->adev->gart.ready)
+		amdgpu_gart_unbind(gtt->adev, gtt->offset, ttm->num_pages);
+
+	if (gtt->userptr)
+		amdgpu_ttm_tt_unpin_userptr(ttm);
+
+	return 0;
+}
+
+static void amdgpu_ttm_backend_destroy(struct ttm_tt *ttm)
+{
+	struct amdgpu_ttm_tt *gtt = (void *)ttm;
+
+	ttm_dma_tt_fini(&gtt->ttm);
+	kfree(gtt);
+}
+
+static struct ttm_backend_func amdgpu_backend_func = {
+	.bind = &amdgpu_ttm_backend_bind,
+	.unbind = &amdgpu_ttm_backend_unbind,
+	.destroy = &amdgpu_ttm_backend_destroy,
+};
+
+static struct ttm_tt *amdgpu_ttm_tt_create(struct ttm_bo_device *bdev,
+				    unsigned long size, uint32_t page_flags,
+				    struct page *dummy_read_page)
+{
+	struct amdgpu_device *adev;
+	struct amdgpu_ttm_tt *gtt;
+
+	adev = amdgpu_get_adev(bdev);
+
+	gtt = kzalloc(sizeof(struct amdgpu_ttm_tt), GFP_KERNEL);
+	if (gtt == NULL) {
+		return NULL;
+	}
+	gtt->ttm.ttm.func = &amdgpu_backend_func;
+	gtt->adev = adev;
+	if (ttm_dma_tt_init(&gtt->ttm, bdev, size, page_flags, dummy_read_page)) {
+		kfree(gtt);
+		return NULL;
+	}
+	return &gtt->ttm.ttm;
+}
+
+static int amdgpu_ttm_tt_populate(struct ttm_tt *ttm)
+{
+	struct amdgpu_device *adev;
+	struct amdgpu_ttm_tt *gtt = (void *)ttm;
+	unsigned i;
+	int r;
+	bool slave = !!(ttm->page_flags & TTM_PAGE_FLAG_SG);
+
+	if (ttm->state != tt_unpopulated)
+		return 0;
+
+	if (gtt && gtt->userptr) {
+		ttm->sg = kcalloc(1, sizeof(struct sg_table), GFP_KERNEL);
+		if (!ttm->sg)
+			return -ENOMEM;
+
+		ttm->page_flags |= TTM_PAGE_FLAG_SG;
+		ttm->state = tt_unbound;
+		return 0;
+	}
+
+	if (slave && ttm->sg) {
+		drm_prime_sg_to_page_addr_arrays(ttm->sg, ttm->pages,
+						 gtt->ttm.dma_address, ttm->num_pages);
+		ttm->state = tt_unbound;
+		return 0;
+	}
+
+	adev = amdgpu_get_adev(ttm->bdev);
+
+#ifdef CONFIG_SWIOTLB
+	if (swiotlb_nr_tbl()) {
+		return ttm_dma_populate(&gtt->ttm, adev->dev);
+	}
+#endif
+
+	r = ttm_pool_populate(ttm);
+	if (r) {
+		return r;
+	}
+
+	for (i = 0; i < ttm->num_pages; i++) {
+		gtt->ttm.dma_address[i] = pci_map_page(adev->pdev, ttm->pages[i],
+						       0, PAGE_SIZE,
+						       PCI_DMA_BIDIRECTIONAL);
+		if (pci_dma_mapping_error(adev->pdev, gtt->ttm.dma_address[i])) {
+			while (--i) {
+				pci_unmap_page(adev->pdev, gtt->ttm.dma_address[i],
+					       PAGE_SIZE, PCI_DMA_BIDIRECTIONAL);
+				gtt->ttm.dma_address[i] = 0;
+			}
+			ttm_pool_unpopulate(ttm);
+			return -EFAULT;
+		}
+	}
+	return 0;
+}
+
+static void amdgpu_ttm_tt_unpopulate(struct ttm_tt *ttm)
+{
+	struct amdgpu_device *adev;
+	struct amdgpu_ttm_tt *gtt = (void *)ttm;
+	unsigned i;
+	bool slave = !!(ttm->page_flags & TTM_PAGE_FLAG_SG);
+
+	if (gtt && gtt->userptr) {
+		kfree(ttm->sg);
+		ttm->page_flags &= ~TTM_PAGE_FLAG_SG;
+		return;
+	}
+
+	if (slave)
+		return;
+
+	adev = amdgpu_get_adev(ttm->bdev);
+
+#ifdef CONFIG_SWIOTLB
+	if (swiotlb_nr_tbl()) {
+		ttm_dma_unpopulate(&gtt->ttm, adev->dev);
+		return;
+	}
+#endif
+
+	for (i = 0; i < ttm->num_pages; i++) {
+		if (gtt->ttm.dma_address[i]) {
+			pci_unmap_page(adev->pdev, gtt->ttm.dma_address[i],
+				       PAGE_SIZE, PCI_DMA_BIDIRECTIONAL);
+		}
+	}
+
+	ttm_pool_unpopulate(ttm);
+}
+
+int amdgpu_ttm_tt_set_userptr(struct ttm_tt *ttm, uint64_t addr,
+			      uint32_t flags)
+{
+	struct amdgpu_ttm_tt *gtt = (void *)ttm;
+
+	if (gtt == NULL)
+		return -EINVAL;
+
+	gtt->userptr = addr;
+	gtt->usermm = current->mm;
+	gtt->userflags = flags;
+	return 0;
+}
+
+bool amdgpu_ttm_tt_has_userptr(struct ttm_tt *ttm)
+{
+	struct amdgpu_ttm_tt *gtt = (void *)ttm;
+
+	if (gtt == NULL)
+		return false;
+
+	return !!gtt->userptr;
+}
+
+bool amdgpu_ttm_tt_is_readonly(struct ttm_tt *ttm)
+{
+	struct amdgpu_ttm_tt *gtt = (void *)ttm;
+
+	if (gtt == NULL)
+		return false;
+
+	return !!(gtt->userflags & AMDGPU_GEM_USERPTR_READONLY);
+}
+
+uint32_t amdgpu_ttm_tt_pte_flags(struct amdgpu_device *adev, struct ttm_tt *ttm,
+				 struct ttm_mem_reg *mem)
+{
+	uint32_t flags = 0;
+
+	if (mem && mem->mem_type != TTM_PL_SYSTEM)
+		flags |= AMDGPU_PTE_VALID;
+
+	if (mem && mem->mem_type == TTM_PL_TT)
+		flags |= AMDGPU_PTE_SYSTEM;
+
+	if (!ttm || ttm->caching_state == tt_cached)
+		flags |= AMDGPU_PTE_SNOOPED;
+
+	if (adev->asic_type >= CHIP_TOPAZ)
+		flags |= AMDGPU_PTE_EXECUTABLE;
+
+	flags |= AMDGPU_PTE_READABLE;
+
+	if (!amdgpu_ttm_tt_is_readonly(ttm))
+		flags |= AMDGPU_PTE_WRITEABLE;
+
+	return flags;
+}
+
+static struct ttm_bo_driver amdgpu_bo_driver = {
+	.ttm_tt_create = &amdgpu_ttm_tt_create,
+	.ttm_tt_populate = &amdgpu_ttm_tt_populate,
+	.ttm_tt_unpopulate = &amdgpu_ttm_tt_unpopulate,
+	.invalidate_caches = &amdgpu_invalidate_caches,
+	.init_mem_type = &amdgpu_init_mem_type,
+	.evict_flags = &amdgpu_evict_flags,
+	.move = &amdgpu_bo_move,
+	.verify_access = &amdgpu_verify_access,
+	.move_notify = &amdgpu_bo_move_notify,
+	.fault_reserve_notify = &amdgpu_bo_fault_reserve_notify,
+	.io_mem_reserve = &amdgpu_ttm_io_mem_reserve,
+	.io_mem_free = &amdgpu_ttm_io_mem_free,
+};
+
+int amdgpu_ttm_init(struct amdgpu_device *adev)
+{
+	int r;
+
+	r = amdgpu_ttm_global_init(adev);
+	if (r) {
+		return r;
+	}
+	/* No others user of address space so set it to 0 */
+	r = ttm_bo_device_init(&adev->mman.bdev,
+			       adev->mman.bo_global_ref.ref.object,
+			       &amdgpu_bo_driver,
+			       adev->ddev->anon_inode->i_mapping,
+			       DRM_FILE_PAGE_OFFSET,
+			       adev->need_dma32);
+	if (r) {
+		DRM_ERROR("failed initializing buffer object driver(%d).\n", r);
+		return r;
+	}
+	adev->mman.initialized = true;
+	r = ttm_bo_init_mm(&adev->mman.bdev, TTM_PL_VRAM,
+				adev->mc.real_vram_size >> PAGE_SHIFT);
+	if (r) {
+		DRM_ERROR("Failed initializing VRAM heap.\n");
+		return r;
+	}
+	/* Change the size here instead of the init above so only lpfn is affected */
+	amdgpu_ttm_set_active_vram_size(adev, adev->mc.visible_vram_size);
+
+	r = amdgpu_bo_create(adev, 256 * 1024, PAGE_SIZE, true,
+			     AMDGPU_GEM_DOMAIN_VRAM, 0,
+			     NULL, &adev->stollen_vga_memory);
+	if (r) {
+		return r;
+	}
+	r = amdgpu_bo_reserve(adev->stollen_vga_memory, false);
+	if (r)
+		return r;
+	r = amdgpu_bo_pin(adev->stollen_vga_memory, AMDGPU_GEM_DOMAIN_VRAM, NULL);
+	amdgpu_bo_unreserve(adev->stollen_vga_memory);
+	if (r) {
+		amdgpu_bo_unref(&adev->stollen_vga_memory);
+		return r;
+	}
+	DRM_INFO("amdgpu: %uM of VRAM memory ready\n",
+		 (unsigned) (adev->mc.real_vram_size / (1024 * 1024)));
+	r = ttm_bo_init_mm(&adev->mman.bdev, TTM_PL_TT,
+				adev->mc.gtt_size >> PAGE_SHIFT);
+	if (r) {
+		DRM_ERROR("Failed initializing GTT heap.\n");
+		return r;
+	}
+	DRM_INFO("amdgpu: %uM of GTT memory ready.\n",
+		 (unsigned)(adev->mc.gtt_size / (1024 * 1024)));
+
+	adev->gds.mem.total_size = adev->gds.mem.total_size << AMDGPU_GDS_SHIFT;
+	adev->gds.mem.gfx_partition_size = adev->gds.mem.gfx_partition_size << AMDGPU_GDS_SHIFT;
+	adev->gds.mem.cs_partition_size = adev->gds.mem.cs_partition_size << AMDGPU_GDS_SHIFT;
+	adev->gds.gws.total_size = adev->gds.gws.total_size << AMDGPU_GWS_SHIFT;
+	adev->gds.gws.gfx_partition_size = adev->gds.gws.gfx_partition_size << AMDGPU_GWS_SHIFT;
+	adev->gds.gws.cs_partition_size = adev->gds.gws.cs_partition_size << AMDGPU_GWS_SHIFT;
+	adev->gds.oa.total_size = adev->gds.oa.total_size << AMDGPU_OA_SHIFT;
+	adev->gds.oa.gfx_partition_size = adev->gds.oa.gfx_partition_size << AMDGPU_OA_SHIFT;
+	adev->gds.oa.cs_partition_size = adev->gds.oa.cs_partition_size << AMDGPU_OA_SHIFT;
+	/* GDS Memory */
+	r = ttm_bo_init_mm(&adev->mman.bdev, AMDGPU_PL_GDS,
+				adev->gds.mem.total_size >> PAGE_SHIFT);
+	if (r) {
+		DRM_ERROR("Failed initializing GDS heap.\n");
+		return r;
+	}
+
+	/* GWS */
+	r = ttm_bo_init_mm(&adev->mman.bdev, AMDGPU_PL_GWS,
+				adev->gds.gws.total_size >> PAGE_SHIFT);
+	if (r) {
+		DRM_ERROR("Failed initializing gws heap.\n");
+		return r;
+	}
+
+	/* OA */
+	r = ttm_bo_init_mm(&adev->mman.bdev, AMDGPU_PL_OA,
+				adev->gds.oa.total_size >> PAGE_SHIFT);
+	if (r) {
+		DRM_ERROR("Failed initializing oa heap.\n");
+		return r;
+	}
+
+	r = amdgpu_ttm_debugfs_init(adev);
+	if (r) {
+		DRM_ERROR("Failed to init debugfs\n");
+		return r;
+	}
+	return 0;
+}
+
+void amdgpu_ttm_fini(struct amdgpu_device *adev)
+{
+	int r;
+
+	if (!adev->mman.initialized)
+		return;
+	amdgpu_ttm_debugfs_fini(adev);
+	if (adev->stollen_vga_memory) {
+		r = amdgpu_bo_reserve(adev->stollen_vga_memory, false);
+		if (r == 0) {
+			amdgpu_bo_unpin(adev->stollen_vga_memory);
+			amdgpu_bo_unreserve(adev->stollen_vga_memory);
+		}
+		amdgpu_bo_unref(&adev->stollen_vga_memory);
+	}
+	ttm_bo_clean_mm(&adev->mman.bdev, TTM_PL_VRAM);
+	ttm_bo_clean_mm(&adev->mman.bdev, TTM_PL_TT);
+	ttm_bo_clean_mm(&adev->mman.bdev, AMDGPU_PL_GDS);
+	ttm_bo_clean_mm(&adev->mman.bdev, AMDGPU_PL_GWS);
+	ttm_bo_clean_mm(&adev->mman.bdev, AMDGPU_PL_OA);
+	ttm_bo_device_release(&adev->mman.bdev);
+	amdgpu_gart_fini(adev);
+	amdgpu_ttm_global_fini(adev);
+	adev->mman.initialized = false;
+	DRM_INFO("amdgpu: ttm finalized\n");
+}
+
+/* this should only be called at bootup or when userspace
+ * isn't running */
+void amdgpu_ttm_set_active_vram_size(struct amdgpu_device *adev, u64 size)
+{
+	struct ttm_mem_type_manager *man;
+
+	if (!adev->mman.initialized)
+		return;
+
+	man = &adev->mman.bdev.man[TTM_PL_VRAM];
+	/* this just adjusts TTM size idea, which sets lpfn to the correct value */
+	man->size = size >> PAGE_SHIFT;
+}
+
+int amdgpu_mmap(struct file *filp, struct vm_area_struct *vma)
+{
+	struct drm_file *file_priv;
+	struct amdgpu_device *adev;
+
+	if (unlikely(vma->vm_pgoff < DRM_FILE_PAGE_OFFSET))
+		return -EINVAL;
+
+	file_priv = filp->private_data;
+	adev = file_priv->minor->dev->dev_private;
+	if (adev == NULL)
+		return -EINVAL;
+
+	return ttm_bo_mmap(filp, vma, &adev->mman.bdev);
+}
+
+int amdgpu_copy_buffer(struct amdgpu_ring *ring,
+		       uint64_t src_offset,
+		       uint64_t dst_offset,
+		       uint32_t byte_count,
+		       struct reservation_object *resv,
+		       struct amdgpu_fence **fence)
+{
+	struct amdgpu_device *adev = ring->adev;
+	struct amdgpu_sync sync;
+	uint32_t max_bytes;
+	unsigned num_loops, num_dw;
+	unsigned i;
+	int r;
+
+	/* sync other rings */
+	amdgpu_sync_create(&sync);
+	if (resv) {
+		r = amdgpu_sync_resv(adev, &sync, resv, false);
+		if (r) {
+			DRM_ERROR("sync failed (%d).\n", r);
+			amdgpu_sync_free(adev, &sync, NULL);
+			return r;
+		}
+	}
+
+	max_bytes = adev->mman.buffer_funcs->copy_max_bytes;
+	num_loops = DIV_ROUND_UP(byte_count, max_bytes);
+	num_dw = num_loops * adev->mman.buffer_funcs->copy_num_dw;
+
+	/* for fence and sync */
+	num_dw += 64 + AMDGPU_NUM_SYNCS * 8;
+
+	r = amdgpu_ring_lock(ring, num_dw);
+	if (r) {
+		DRM_ERROR("ring lock failed (%d).\n", r);
+		amdgpu_sync_free(adev, &sync, NULL);
+		return r;
+	}
+
+	amdgpu_sync_rings(&sync, ring);
+
+	for (i = 0; i < num_loops; i++) {
+		uint32_t cur_size_in_bytes = min(byte_count, max_bytes);
+
+		amdgpu_emit_copy_buffer(adev, ring, src_offset, dst_offset,
+					cur_size_in_bytes);
+
+		src_offset += cur_size_in_bytes;
+		dst_offset += cur_size_in_bytes;
+		byte_count -= cur_size_in_bytes;
+	}
+
+	r = amdgpu_fence_emit(ring, AMDGPU_FENCE_OWNER_MOVE, fence);
+	if (r) {
+		amdgpu_ring_unlock_undo(ring);
+		amdgpu_sync_free(adev, &sync, NULL);
+		return r;
+	}
+
+	amdgpu_ring_unlock_commit(ring);
+	amdgpu_sync_free(adev, &sync, *fence);
+
+	return 0;
+}
+
+#if defined(CONFIG_DEBUG_FS)
+
+static int amdgpu_mm_dump_table(struct seq_file *m, void *data)
+{
+	struct drm_info_node *node = (struct drm_info_node *)m->private;
+	unsigned ttm_pl = *(int *)node->info_ent->data;
+	struct drm_device *dev = node->minor->dev;
+	struct amdgpu_device *adev = dev->dev_private;
+	struct drm_mm *mm = (struct drm_mm *)adev->mman.bdev.man[ttm_pl].priv;
+	int ret;
+	struct ttm_bo_global *glob = adev->mman.bdev.glob;
+
+	spin_lock(&glob->lru_lock);
+	ret = drm_mm_dump_table(m, mm);
+	spin_unlock(&glob->lru_lock);
+	return ret;
+}
+
+static int ttm_pl_vram = TTM_PL_VRAM;
+static int ttm_pl_tt = TTM_PL_TT;
+
+static struct drm_info_list amdgpu_ttm_debugfs_list[] = {
+	{"amdgpu_vram_mm", amdgpu_mm_dump_table, 0, &ttm_pl_vram},
+	{"amdgpu_gtt_mm", amdgpu_mm_dump_table, 0, &ttm_pl_tt},
+	{"ttm_page_pool", ttm_page_alloc_debugfs, 0, NULL},
+#ifdef CONFIG_SWIOTLB
+	{"ttm_dma_page_pool", ttm_dma_page_alloc_debugfs, 0, NULL}
+#endif
+};
+
+static ssize_t amdgpu_ttm_vram_read(struct file *f, char __user *buf,
+				    size_t size, loff_t *pos)
+{
+	struct amdgpu_device *adev = f->f_inode->i_private;
+	ssize_t result = 0;
+	int r;
+
+	if (size & 0x3 || *pos & 0x3)
+		return -EINVAL;
+
+	while (size) {
+		unsigned long flags;
+		uint32_t value;
+
+		if (*pos >= adev->mc.mc_vram_size)
+			return result;
+
+		spin_lock_irqsave(&adev->mmio_idx_lock, flags);
+		WREG32(mmMM_INDEX, ((uint32_t)*pos) | 0x80000000);
+		WREG32(mmMM_INDEX_HI, *pos >> 31);
+		value = RREG32(mmMM_DATA);
+		spin_unlock_irqrestore(&adev->mmio_idx_lock, flags);
+
+		r = put_user(value, (uint32_t *)buf);
+		if (r)
+			return r;
+
+		result += 4;
+		buf += 4;
+		*pos += 4;
+		size -= 4;
+	}
+
+	return result;
+}
+
+static const struct file_operations amdgpu_ttm_vram_fops = {
+	.owner = THIS_MODULE,
+	.read = amdgpu_ttm_vram_read,
+	.llseek = default_llseek
+};
+
+static ssize_t amdgpu_ttm_gtt_read(struct file *f, char __user *buf,
+				   size_t size, loff_t *pos)
+{
+	struct amdgpu_device *adev = f->f_inode->i_private;
+	ssize_t result = 0;
+	int r;
+
+	while (size) {
+		loff_t p = *pos / PAGE_SIZE;
+		unsigned off = *pos & ~PAGE_MASK;
+		size_t cur_size = min_t(size_t, size, PAGE_SIZE - off);
+		struct page *page;
+		void *ptr;
+
+		if (p >= adev->gart.num_cpu_pages)
+			return result;
+
+		page = adev->gart.pages[p];
+		if (page) {
+			ptr = kmap(page);
+			ptr += off;
+
+			r = copy_to_user(buf, ptr, cur_size);
+			kunmap(adev->gart.pages[p]);
+		} else
+			r = clear_user(buf, cur_size);
+
+		if (r)
+			return -EFAULT;
+
+		result += cur_size;
+		buf += cur_size;
+		*pos += cur_size;
+		size -= cur_size;
+	}
+
+	return result;
+}
+
+static const struct file_operations amdgpu_ttm_gtt_fops = {
+	.owner = THIS_MODULE,
+	.read = amdgpu_ttm_gtt_read,
+	.llseek = default_llseek
+};
+
+#endif
+
+static int amdgpu_ttm_debugfs_init(struct amdgpu_device *adev)
+{
+#if defined(CONFIG_DEBUG_FS)
+	unsigned count;
+
+	struct drm_minor *minor = adev->ddev->primary;
+	struct dentry *ent, *root = minor->debugfs_root;
+
+	ent = debugfs_create_file("amdgpu_vram", S_IFREG | S_IRUGO, root,
+				  adev, &amdgpu_ttm_vram_fops);
+	if (IS_ERR(ent))
+		return PTR_ERR(ent);
+	i_size_write(ent->d_inode, adev->mc.mc_vram_size);
+	adev->mman.vram = ent;
+
+	ent = debugfs_create_file("amdgpu_gtt", S_IFREG | S_IRUGO, root,
+				  adev, &amdgpu_ttm_gtt_fops);
+	if (IS_ERR(ent))
+		return PTR_ERR(ent);
+	i_size_write(ent->d_inode, adev->mc.gtt_size);
+	adev->mman.gtt = ent;
+
+	count = ARRAY_SIZE(amdgpu_ttm_debugfs_list);
+
+#ifdef CONFIG_SWIOTLB
+	if (!swiotlb_nr_tbl())
+		--count;
+#endif
+
+	return amdgpu_debugfs_add_files(adev, amdgpu_ttm_debugfs_list, count);
+#else
+
+	return 0;
+#endif
+}
+
+static void amdgpu_ttm_debugfs_fini(struct amdgpu_device *adev)
+{
+#if defined(CONFIG_DEBUG_FS)
+
+	debugfs_remove(adev->mman.vram);
+	adev->mman.vram = NULL;
+
+	debugfs_remove(adev->mman.gtt);
+	adev->mman.gtt = NULL;
+#endif
+}