Re: [PATCH v6 11/18] drm/virtio: switch from ttm to gem shmem helpers

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On Tue, Jul 2, 2019 at 7:19 AM Gerd Hoffmann <kraxel@xxxxxxxxxx> wrote:
>
> virtio-gpu basically needs a sg_table for the bo, to tell the host where
> the backing pages for the object are.  So the gem shmem helpers are a
> perfect fit.  Some drm_gem_object_funcs need thin wrappers to update the
> host state, but otherwise the helpers handle everything just fine.
>
> Once the fencing was sorted the switch was surprisingly easy and for the
> most part just removing the ttm code.
>
> v4: fix drm_gem_object_funcs name.
>
> Signed-off-by: Gerd Hoffmann <kraxel@xxxxxxxxxx>
> Acked-by: Daniel Vetter <daniel.vetter@xxxxxxxx>
> ---
>  drivers/gpu/drm/virtio/virtgpu_drv.h    |  52 +---
>  drivers/gpu/drm/virtio/virtgpu_drv.c    |  20 +-
>  drivers/gpu/drm/virtio/virtgpu_gem.c    |  16 +-
>  drivers/gpu/drm/virtio/virtgpu_ioctl.c  |  19 +-
>  drivers/gpu/drm/virtio/virtgpu_kms.c    |   9 -
>  drivers/gpu/drm/virtio/virtgpu_object.c | 146 ++++--------
>  drivers/gpu/drm/virtio/virtgpu_prime.c  |  37 ---
>  drivers/gpu/drm/virtio/virtgpu_ttm.c    | 304 ------------------------
>  drivers/gpu/drm/virtio/virtgpu_vq.c     |  24 +-
>  drivers/gpu/drm/virtio/Kconfig          |   2 +-
>  drivers/gpu/drm/virtio/Makefile         |   2 +-
>  11 files changed, 82 insertions(+), 549 deletions(-)
>  delete mode 100644 drivers/gpu/drm/virtio/virtgpu_ttm.c
>
> diff --git a/drivers/gpu/drm/virtio/virtgpu_drv.h b/drivers/gpu/drm/virtio/virtgpu_drv.h
> index 12168067a874..f8a586029400 100644
> --- a/drivers/gpu/drm/virtio/virtgpu_drv.h
> +++ b/drivers/gpu/drm/virtio/virtgpu_drv.h
> @@ -33,14 +33,11 @@
>
>  #include <drm/drmP.h>
>  #include <drm/drm_gem.h>
> +#include <drm/drm_gem_shmem_helper.h>
>  #include <drm/drm_atomic.h>
>  #include <drm/drm_encoder.h>
>  #include <drm/drm_fb_helper.h>
>  #include <drm/drm_probe_helper.h>
> -#include <drm/ttm/ttm_bo_api.h>
> -#include <drm/ttm/ttm_bo_driver.h>
> -#include <drm/ttm/ttm_placement.h>
> -#include <drm/ttm/ttm_module.h>
>
>  #define DRIVER_NAME "virtio_gpu"
>  #define DRIVER_DESC "virtio GPU"
> @@ -68,21 +65,16 @@ struct virtio_gpu_object_params {
>  };
>
>  struct virtio_gpu_object {
> -       struct drm_gem_object gem_base;
> +       struct drm_gem_shmem_object base;
>         uint32_t hw_res_handle;
>
>         struct sg_table *pages;
>         uint32_t mapped;
> -       void *vmap;
>         bool dumb;
> -       struct ttm_place                placement_code;
> -       struct ttm_placement            placement;
> -       struct ttm_buffer_object        tbo;
> -       struct ttm_bo_kmap_obj          kmap;
>         bool created;
>  };
>  #define gem_to_virtio_gpu_obj(gobj) \
> -       container_of((gobj), struct virtio_gpu_object, gem_base)
> +       container_of((gobj), struct virtio_gpu_object, base.base)
>
>  struct virtio_gpu_object_array {
>         struct ww_acquire_ctx ticket;
> @@ -153,10 +145,6 @@ struct virtio_gpu_framebuffer {
>  #define to_virtio_gpu_framebuffer(x) \
>         container_of(x, struct virtio_gpu_framebuffer, base)
>
> -struct virtio_gpu_mman {
> -       struct ttm_bo_device            bdev;
> -};
> -
>  struct virtio_gpu_queue {
>         struct virtqueue *vq;
>         spinlock_t qlock;
> @@ -185,8 +173,6 @@ struct virtio_gpu_device {
>
>         struct virtio_device *vdev;
>
> -       struct virtio_gpu_mman mman;
> -
>         struct virtio_gpu_output outputs[VIRTIO_GPU_MAX_SCANOUTS];
>         uint32_t num_scanouts;
>
> @@ -357,11 +343,6 @@ struct drm_plane *virtio_gpu_plane_init(struct virtio_gpu_device *vgdev,
>                                         enum drm_plane_type type,
>                                         int index);
>
> -/* virtio_gpu_ttm.c */
> -int virtio_gpu_ttm_init(struct virtio_gpu_device *vgdev);
> -void virtio_gpu_ttm_fini(struct virtio_gpu_device *vgdev);
> -int virtio_gpu_mmap(struct file *filp, struct vm_area_struct *vma);
> -
>  /* virtio_gpu_fence.c */
>  bool virtio_fence_signaled(struct dma_fence *f);
>  struct virtio_gpu_fence *virtio_gpu_fence_alloc(
> @@ -373,58 +354,47 @@ void virtio_gpu_fence_event_process(struct virtio_gpu_device *vdev,
>                                     u64 last_seq);
>
>  /* virtio_gpu_object */
> +struct drm_gem_object *virtio_gpu_create_object(struct drm_device *dev,
> +                                               size_t size);
>  int virtio_gpu_object_create(struct virtio_gpu_device *vgdev,
>                              struct virtio_gpu_object_params *params,
>                              struct virtio_gpu_object **bo_ptr,
>                              struct virtio_gpu_fence *fence);
> -void virtio_gpu_object_kunmap(struct virtio_gpu_object *bo);
> -int virtio_gpu_object_kmap(struct virtio_gpu_object *bo);
> -int virtio_gpu_object_get_sg_table(struct virtio_gpu_device *qdev,
> -                                  struct virtio_gpu_object *bo);
> -void virtio_gpu_object_free_sg_table(struct virtio_gpu_object *bo);
>
>  /* virtgpu_prime.c */
> -struct sg_table *virtgpu_gem_prime_get_sg_table(struct drm_gem_object *obj);
>  struct drm_gem_object *virtgpu_gem_prime_import_sg_table(
>         struct drm_device *dev, struct dma_buf_attachment *attach,
>         struct sg_table *sgt);
> -void *virtgpu_gem_prime_vmap(struct drm_gem_object *obj);
> -void virtgpu_gem_prime_vunmap(struct drm_gem_object *obj, void *vaddr);
> -int virtgpu_gem_prime_mmap(struct drm_gem_object *obj,
> -                          struct vm_area_struct *vma);
>
>  static inline struct virtio_gpu_object*
>  virtio_gpu_object_ref(struct virtio_gpu_object *bo)
>  {
> -       ttm_bo_get(&bo->tbo);
> +       drm_gem_object_get(&bo->base.base);
>         return bo;
>  }
>
>  static inline void virtio_gpu_object_unref(struct virtio_gpu_object **bo)
>  {
> -       struct ttm_buffer_object *tbo;
> -
>         if ((*bo) == NULL)
>                 return;
> -       tbo = &((*bo)->tbo);
> -       ttm_bo_put(tbo);
> +       drm_gem_object_put(&(*bo)->base.base);
>         *bo = NULL;
>  }
>
>  static inline u64 virtio_gpu_object_mmap_offset(struct virtio_gpu_object *bo)
>  {
> -       return drm_vma_node_offset_addr(&bo->tbo.vma_node);
> +       return drm_vma_node_offset_addr(&bo->base.base.vma_node);
>  }
>
>  static inline int virtio_gpu_object_reserve(struct virtio_gpu_object *bo)
>  {
>         int r;
>
> -       r = reservation_object_lock_interruptible(bo->gem_base.resv, NULL);
> +       r = reservation_object_lock_interruptible(bo->base.base.resv, NULL);
>         if (unlikely(r != 0)) {
>                 if (r != -EINTR) {
>                         struct virtio_gpu_device *qdev =
> -                               bo->gem_base.dev->dev_private;
> +                               bo->base.base.dev->dev_private;
>                         dev_err(qdev->dev, "%p reserve failed\n", bo);
>                 }
>                 return r;
> @@ -434,7 +404,7 @@ static inline int virtio_gpu_object_reserve(struct virtio_gpu_object *bo)
>
>  static inline void virtio_gpu_object_unreserve(struct virtio_gpu_object *bo)
>  {
> -       reservation_object_unlock(bo->gem_base.resv);
> +       reservation_object_unlock(bo->base.base.resv);
>  }
>
>  /* virgl debufs */
> diff --git a/drivers/gpu/drm/virtio/virtgpu_drv.c b/drivers/gpu/drm/virtio/virtgpu_drv.c
> index 99bcd290f1fb..8ce193e2800b 100644
> --- a/drivers/gpu/drm/virtio/virtgpu_drv.c
> +++ b/drivers/gpu/drm/virtio/virtgpu_drv.c
> @@ -182,17 +182,7 @@ MODULE_AUTHOR("Dave Airlie <airlied@xxxxxxxxxx>");
>  MODULE_AUTHOR("Gerd Hoffmann <kraxel@xxxxxxxxxx>");
>  MODULE_AUTHOR("Alon Levy");
>
> -static const struct file_operations virtio_gpu_driver_fops = {
> -       .owner = THIS_MODULE,
> -       .open = drm_open,
> -       .mmap = virtio_gpu_mmap,
> -       .poll = drm_poll,
> -       .read = drm_read,
> -       .unlocked_ioctl = drm_ioctl,
> -       .release = drm_release,
> -       .compat_ioctl = drm_compat_ioctl,
> -       .llseek = noop_llseek,
> -};
> +DEFINE_DRM_GEM_SHMEM_FOPS(virtio_gpu_driver_fops);
We used to have TTM_PL_FLAG_CACHED.  With this, it seems mmap now
calls drm_gem_mmap_obj indirectly and sets the memory type to
writecombine.

>
>  static struct drm_driver driver = {
>         .driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_RENDER | DRIVER_ATOMIC,
> @@ -207,15 +197,9 @@ static struct drm_driver driver = {
>  #endif
>         .prime_handle_to_fd = drm_gem_prime_handle_to_fd,
>         .prime_fd_to_handle = drm_gem_prime_fd_to_handle,
> -       .gem_prime_get_sg_table = virtgpu_gem_prime_get_sg_table,
>         .gem_prime_import_sg_table = virtgpu_gem_prime_import_sg_table,
> -       .gem_prime_vmap = virtgpu_gem_prime_vmap,
> -       .gem_prime_vunmap = virtgpu_gem_prime_vunmap,
> -       .gem_prime_mmap = virtgpu_gem_prime_mmap,
>
> -       .gem_free_object_unlocked = virtio_gpu_gem_free_object,
> -       .gem_open_object = virtio_gpu_gem_object_open,
> -       .gem_close_object = virtio_gpu_gem_object_close,
> +       .gem_create_object = virtio_gpu_create_object,
>         .fops = &virtio_gpu_driver_fops,
>
>         .ioctls = virtio_gpu_ioctls,
> diff --git a/drivers/gpu/drm/virtio/virtgpu_gem.c b/drivers/gpu/drm/virtio/virtgpu_gem.c
> index e88df5e06d06..8a95864404ca 100644
> --- a/drivers/gpu/drm/virtio/virtgpu_gem.c
> +++ b/drivers/gpu/drm/virtio/virtgpu_gem.c
> @@ -26,14 +26,6 @@
>  #include <drm/drmP.h>
>  #include "virtgpu_drv.h"
>
> -void virtio_gpu_gem_free_object(struct drm_gem_object *gem_obj)
> -{
> -       struct virtio_gpu_object *obj = gem_to_virtio_gpu_obj(gem_obj);
> -
> -       if (obj)
> -               virtio_gpu_object_unref(&obj);
> -}
> -
>  struct virtio_gpu_object*
>  virtio_gpu_alloc_object(struct drm_device *dev,
>                         struct virtio_gpu_object_params *params,
> @@ -64,16 +56,16 @@ int virtio_gpu_gem_create(struct drm_file *file,
>         if (IS_ERR(obj))
>                 return PTR_ERR(obj);
>
> -       ret = drm_gem_handle_create(file, &obj->gem_base, &handle);
> +       ret = drm_gem_handle_create(file, &obj->base.base, &handle);
>         if (ret) {
> -               drm_gem_object_release(&obj->gem_base);
> +               drm_gem_object_release(&obj->base.base);
>                 return ret;
>         }
>
> -       *obj_p = &obj->gem_base;
> +       *obj_p = &obj->base.base;
>
>         /* drop reference from allocate - handle holds it now */
> -       drm_gem_object_put_unlocked(&obj->gem_base);
> +       drm_gem_object_put_unlocked(&obj->base.base);
>
>         *handle_p = handle;
>         return 0;
> diff --git a/drivers/gpu/drm/virtio/virtgpu_ioctl.c b/drivers/gpu/drm/virtio/virtgpu_ioctl.c
> index 1fa8aa91d590..107057816e1f 100644
> --- a/drivers/gpu/drm/virtio/virtgpu_ioctl.c
> +++ b/drivers/gpu/drm/virtio/virtgpu_ioctl.c
> @@ -27,7 +27,6 @@
>
>  #include <drm/drmP.h>
>  #include <drm/virtgpu_drm.h>
> -#include <drm/ttm/ttm_execbuf_util.h>
>  #include <linux/sync_file.h>
>
>  #include "virtgpu_drv.h"
> @@ -259,7 +258,7 @@ static int virtio_gpu_resource_create_ioctl(struct drm_device *dev, void *data,
>         dma_fence_put(&fence->f);
>         if (IS_ERR(qobj))
>                 return PTR_ERR(qobj);
> -       obj = &qobj->gem_base;
> +       obj = &qobj->base.base;
>
>         ret = drm_gem_handle_create(file_priv, obj, &handle);
>         if (ret) {
> @@ -286,7 +285,7 @@ static int virtio_gpu_resource_info_ioctl(struct drm_device *dev, void *data,
>
>         qobj = gem_to_virtio_gpu_obj(gobj);
>
> -       ri->size = qobj->gem_base.size;
> +       ri->size = qobj->base.base.size;
>         ri->res_handle = qobj->hw_res_handle;
>         drm_gem_object_put_unlocked(gobj);
>         return 0;
> @@ -299,7 +298,6 @@ static int virtio_gpu_transfer_from_host_ioctl(struct drm_device *dev,
>         struct virtio_gpu_device *vgdev = dev->dev_private;
>         struct virtio_gpu_fpriv *vfpriv = file->driver_priv;
>         struct drm_virtgpu_3d_transfer_from_host *args = data;
> -       struct ttm_operation_ctx ctx = { true, false };
>         struct drm_gem_object *gobj = NULL;
>         struct virtio_gpu_object *qobj = NULL;
>         struct virtio_gpu_fence *fence;
> @@ -320,10 +318,6 @@ static int virtio_gpu_transfer_from_host_ioctl(struct drm_device *dev,
>         if (ret)
>                 goto out;
>
> -       ret = ttm_bo_validate(&qobj->tbo, &qobj->placement, &ctx);
> -       if (unlikely(ret))
> -               goto out_unres;
> -
>         convert_to_hw_box(&box, &args->box);
>
>         fence = virtio_gpu_fence_alloc(vgdev);
> @@ -335,7 +329,7 @@ static int virtio_gpu_transfer_from_host_ioctl(struct drm_device *dev,
>                 (vgdev, qobj->hw_res_handle,
>                  vfpriv->ctx_id, offset, args->level,
>                  &box, fence);
> -       reservation_object_add_excl_fence(qobj->tbo.resv,
> +       reservation_object_add_excl_fence(qobj->base.base.resv,
>                                           &fence->f);
>
>         dma_fence_put(&fence->f);
> @@ -352,7 +346,6 @@ static int virtio_gpu_transfer_to_host_ioctl(struct drm_device *dev, void *data,
>         struct virtio_gpu_device *vgdev = dev->dev_private;
>         struct virtio_gpu_fpriv *vfpriv = file->driver_priv;
>         struct drm_virtgpu_3d_transfer_to_host *args = data;
> -       struct ttm_operation_ctx ctx = { true, false };
>         struct drm_gem_object *gobj = NULL;
>         struct virtio_gpu_object *qobj = NULL;
>         struct virtio_gpu_fence *fence;
> @@ -370,10 +363,6 @@ static int virtio_gpu_transfer_to_host_ioctl(struct drm_device *dev, void *data,
>         if (ret)
>                 goto out;
>
> -       ret = ttm_bo_validate(&qobj->tbo, &qobj->placement, &ctx);
> -       if (unlikely(ret))
> -               goto out_unres;
> -
>         convert_to_hw_box(&box, &args->box);
>         if (!vgdev->has_virgl_3d) {
>                 virtio_gpu_cmd_transfer_to_host_2d
> @@ -389,7 +378,7 @@ static int virtio_gpu_transfer_to_host_ioctl(struct drm_device *dev, void *data,
>                         (vgdev, qobj,
>                          vfpriv ? vfpriv->ctx_id : 0, offset,
>                          args->level, &box, fence);
> -               reservation_object_add_excl_fence(qobj->tbo.resv,
> +               reservation_object_add_excl_fence(qobj->base.base.resv,
>                                                   &fence->f);
>                 dma_fence_put(&fence->f);
>         }
> diff --git a/drivers/gpu/drm/virtio/virtgpu_kms.c b/drivers/gpu/drm/virtio/virtgpu_kms.c
> index 84b6a6bf00c6..0bc6abaeafca 100644
> --- a/drivers/gpu/drm/virtio/virtgpu_kms.c
> +++ b/drivers/gpu/drm/virtio/virtgpu_kms.c
> @@ -171,12 +171,6 @@ int virtio_gpu_init(struct drm_device *dev)
>                 goto err_vbufs;
>         }
>
> -       ret = virtio_gpu_ttm_init(vgdev);
> -       if (ret) {
> -               DRM_ERROR("failed to init ttm %d\n", ret);
> -               goto err_ttm;
> -       }
> -
>         /* get display info */
>         virtio_cread(vgdev->vdev, struct virtio_gpu_config,
>                      num_scanouts, &num_scanouts);
> @@ -208,8 +202,6 @@ int virtio_gpu_init(struct drm_device *dev)
>         return 0;
>
>  err_scanouts:
> -       virtio_gpu_ttm_fini(vgdev);
> -err_ttm:
>         virtio_gpu_free_vbufs(vgdev);
>  err_vbufs:
>         vgdev->vdev->config->del_vqs(vgdev->vdev);
> @@ -240,7 +232,6 @@ void virtio_gpu_deinit(struct drm_device *dev)
>         vgdev->vdev->config->del_vqs(vgdev->vdev);
>
>         virtio_gpu_modeset_fini(vgdev);
> -       virtio_gpu_ttm_fini(vgdev);
>         virtio_gpu_free_vbufs(vgdev);
>         virtio_gpu_cleanup_cap_cache(vgdev);
>         kfree(vgdev->capsets);
> diff --git a/drivers/gpu/drm/virtio/virtgpu_object.c b/drivers/gpu/drm/virtio/virtgpu_object.c
> index 2902487f051a..fb9d05a68f4c 100644
> --- a/drivers/gpu/drm/virtio/virtgpu_object.c
> +++ b/drivers/gpu/drm/virtio/virtgpu_object.c
> @@ -23,8 +23,6 @@
>   * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
>   */
>
> -#include <drm/ttm/ttm_execbuf_util.h>
> -
>  #include "virtgpu_drv.h"
>
>  static int virtio_gpu_resource_id_get(struct virtio_gpu_device *vgdev,
> @@ -57,39 +55,45 @@ static void virtio_gpu_resource_id_put(struct virtio_gpu_device *vgdev, uint32_t
>  #endif
>  }
>
> -static void virtio_gpu_ttm_bo_destroy(struct ttm_buffer_object *tbo)
> +static void virtio_gpu_free_object(struct drm_gem_object *obj)
>  {
> -       struct virtio_gpu_object *bo;
> -       struct virtio_gpu_device *vgdev;
> -
> -       bo = container_of(tbo, struct virtio_gpu_object, tbo);
> -       vgdev = (struct virtio_gpu_device *)bo->gem_base.dev->dev_private;
> +       struct virtio_gpu_object *bo = gem_to_virtio_gpu_obj(obj);
> +       struct virtio_gpu_device *vgdev = bo->base.base.dev->dev_private;
>
> +       if (bo->pages)
> +               virtio_gpu_object_detach(vgdev, bo);
>         if (bo->created)
>                 virtio_gpu_cmd_unref_resource(vgdev, bo->hw_res_handle);
> -       if (bo->pages)
> -               virtio_gpu_object_free_sg_table(bo);
> -       if (bo->vmap)
> -               virtio_gpu_object_kunmap(bo);
> -       drm_gem_object_release(&bo->gem_base);
>         virtio_gpu_resource_id_put(vgdev, bo->hw_res_handle);
> -       kfree(bo);
> +
> +       drm_gem_shmem_free_object(obj);
>  }
>
> -static void virtio_gpu_init_ttm_placement(struct virtio_gpu_object *vgbo)
> +static const struct drm_gem_object_funcs virtio_gpu_gem_funcs = {
> +       .free = virtio_gpu_free_object,
> +       .open = virtio_gpu_gem_object_open,
> +       .close = virtio_gpu_gem_object_close,
> +
> +       .print_info = drm_gem_shmem_print_info,
> +       .pin = drm_gem_shmem_pin,
> +       .unpin = drm_gem_shmem_unpin,
> +       .get_sg_table = drm_gem_shmem_get_sg_table,
> +       .vmap = drm_gem_shmem_vmap,
> +       .vunmap = drm_gem_shmem_vunmap,
> +       .vm_ops = &drm_gem_shmem_vm_ops,
> +};
> +
> +struct drm_gem_object *virtio_gpu_create_object(struct drm_device *dev,
> +                                               size_t size)
>  {
> -       u32 c = 1;
> +       struct virtio_gpu_object *bo;
>
> -       vgbo->placement.placement = &vgbo->placement_code;
> -       vgbo->placement.busy_placement = &vgbo->placement_code;
> -       vgbo->placement_code.fpfn = 0;
> -       vgbo->placement_code.lpfn = 0;
> -       vgbo->placement_code.flags =
> -               TTM_PL_MASK_CACHING | TTM_PL_FLAG_TT |
> -               TTM_PL_FLAG_NO_EVICT;
> -       vgbo->placement.num_placement = c;
> -       vgbo->placement.num_busy_placement = c;
> +       bo = kzalloc(sizeof(*bo), GFP_KERNEL);
> +       if (!bo)
> +               return NULL;
>
> +       bo->base.base.funcs = &virtio_gpu_gem_funcs;
> +       return &bo->base.base;
>  }
>
>  int virtio_gpu_object_create(struct virtio_gpu_device *vgdev,
> @@ -98,27 +102,22 @@ int virtio_gpu_object_create(struct virtio_gpu_device *vgdev,
>                              struct virtio_gpu_fence *fence)
>  {
>         struct virtio_gpu_object_array *objs = NULL;
> +       struct drm_gem_shmem_object *shmem_obj;
>         struct virtio_gpu_object *bo;
> -       size_t acc_size;
>         int ret;
>
>         *bo_ptr = NULL;
>
> -       acc_size = ttm_bo_dma_acc_size(&vgdev->mman.bdev, params->size,
> -                                      sizeof(struct virtio_gpu_object));
> +       params->size = roundup(params->size, PAGE_SIZE);
> +       shmem_obj = drm_gem_shmem_create(vgdev->ddev, params->size);
> +       if (IS_ERR(shmem_obj))
> +               return PTR_ERR(shmem_obj);
> +       bo = gem_to_virtio_gpu_obj(&shmem_obj->base);
>
> -       bo = kzalloc(sizeof(struct virtio_gpu_object), GFP_KERNEL);
> -       if (bo == NULL)
> -               return -ENOMEM;
>         ret = virtio_gpu_resource_id_get(vgdev, &bo->hw_res_handle);
>         if (ret < 0)
>                 goto err_free_gem;
>
> -       params->size = roundup(params->size, PAGE_SIZE);
> -       ret = drm_gem_object_init(vgdev->ddev, &bo->gem_base, params->size);
> -       if (ret != 0)
> -               goto err_put_id;
> -
>         bo->dumb = params->dumb;
>
>         if (fence) {
> @@ -126,7 +125,7 @@ int virtio_gpu_object_create(struct virtio_gpu_device *vgdev,
>                 objs = virtio_gpu_array_alloc(1);
>                 if (!objs)
>                         goto err_put_id;
> -               virtio_gpu_array_add_obj(objs, &bo->gem_base);
> +               virtio_gpu_array_add_obj(objs, &bo->base.base);
>
>                 ret = virtio_gpu_array_lock_resv(objs);
>                 if (ret != 0)
> @@ -141,15 +140,11 @@ int virtio_gpu_object_create(struct virtio_gpu_device *vgdev,
>                                                objs, fence);
>         }
>
> -       virtio_gpu_init_ttm_placement(bo);
> -       ret = ttm_bo_init(&vgdev->mman.bdev, &bo->tbo, params->size,
> -                         ttm_bo_type_device, &bo->placement, 0,
> -                         true, acc_size, NULL,
> -                         bo->gem_base.resv,
> -                         &virtio_gpu_ttm_bo_destroy);
> -       /* ttm_bo_init failure will call the destroy */
> -       if (ret != 0)
> +       ret = virtio_gpu_object_attach(vgdev, bo, NULL);
> +       if (ret != 0) {
> +               virtio_gpu_free_object(&shmem_obj->base);
>                 return ret;
> +       }
>
>         *bo_ptr = bo;
>         return 0;
> @@ -159,65 +154,6 @@ int virtio_gpu_object_create(struct virtio_gpu_device *vgdev,
>  err_put_id:
>         virtio_gpu_resource_id_put(vgdev, bo->hw_res_handle);
>  err_free_gem:
> -       kfree(bo);
> +       drm_gem_shmem_free_object(&shmem_obj->base);
>         return ret;
>  }
> -
> -void virtio_gpu_object_kunmap(struct virtio_gpu_object *bo)
> -{
> -       bo->vmap = NULL;
> -       ttm_bo_kunmap(&bo->kmap);
> -}
> -
> -int virtio_gpu_object_kmap(struct virtio_gpu_object *bo)
> -{
> -       bool is_iomem;
> -       int r;
> -
> -       WARN_ON(bo->vmap);
> -
> -       r = ttm_bo_kmap(&bo->tbo, 0, bo->tbo.num_pages, &bo->kmap);
> -       if (r)
> -               return r;
> -       bo->vmap = ttm_kmap_obj_virtual(&bo->kmap, &is_iomem);
> -       return 0;
> -}
> -
> -int virtio_gpu_object_get_sg_table(struct virtio_gpu_device *qdev,
> -                                  struct virtio_gpu_object *bo)
> -{
> -       int ret;
> -       struct page **pages = bo->tbo.ttm->pages;
> -       int nr_pages = bo->tbo.num_pages;
> -       struct ttm_operation_ctx ctx = {
> -               .interruptible = false,
> -               .no_wait_gpu = false
> -       };
> -
> -       /* wtf swapping */
> -       if (bo->pages)
> -               return 0;
> -
> -       if (bo->tbo.ttm->state == tt_unpopulated)
> -               bo->tbo.ttm->bdev->driver->ttm_tt_populate(bo->tbo.ttm, &ctx);
> -       bo->pages = kmalloc(sizeof(struct sg_table), GFP_KERNEL);
> -       if (!bo->pages)
> -               goto out;
> -
> -       ret = sg_alloc_table_from_pages(bo->pages, pages, nr_pages, 0,
> -                                       nr_pages << PAGE_SHIFT, GFP_KERNEL);
> -       if (ret)
> -               goto out;
> -       return 0;
> -out:
> -       kfree(bo->pages);
> -       bo->pages = NULL;
> -       return -ENOMEM;
> -}
> -
> -void virtio_gpu_object_free_sg_table(struct virtio_gpu_object *bo)
> -{
> -       sg_free_table(bo->pages);
> -       kfree(bo->pages);
> -       bo->pages = NULL;
> -}
> diff --git a/drivers/gpu/drm/virtio/virtgpu_prime.c b/drivers/gpu/drm/virtio/virtgpu_prime.c
> index 8fbf71bd0c5e..18a155cd08d5 100644
> --- a/drivers/gpu/drm/virtio/virtgpu_prime.c
> +++ b/drivers/gpu/drm/virtio/virtgpu_prime.c
> @@ -28,46 +28,9 @@
>   * device that might share buffers with virtgpu
>   */
>
> -struct sg_table *virtgpu_gem_prime_get_sg_table(struct drm_gem_object *obj)
> -{
> -       struct virtio_gpu_object *bo = gem_to_virtio_gpu_obj(obj);
> -
> -       if (!bo->tbo.ttm->pages || !bo->tbo.ttm->num_pages)
> -               /* should not happen */
> -               return ERR_PTR(-EINVAL);
> -
> -       return drm_prime_pages_to_sg(bo->tbo.ttm->pages,
> -                                    bo->tbo.ttm->num_pages);
> -}
> -
>  struct drm_gem_object *virtgpu_gem_prime_import_sg_table(
>         struct drm_device *dev, struct dma_buf_attachment *attach,
>         struct sg_table *table)
>  {
>         return ERR_PTR(-ENODEV);
>  }
> -
> -void *virtgpu_gem_prime_vmap(struct drm_gem_object *obj)
> -{
> -       struct virtio_gpu_object *bo = gem_to_virtio_gpu_obj(obj);
> -       int ret;
> -
> -       ret = virtio_gpu_object_kmap(bo);
> -       if (ret)
> -               return NULL;
> -       return bo->vmap;
> -}
> -
> -void virtgpu_gem_prime_vunmap(struct drm_gem_object *obj, void *vaddr)
> -{
> -       virtio_gpu_object_kunmap(gem_to_virtio_gpu_obj(obj));
> -}
> -
> -int virtgpu_gem_prime_mmap(struct drm_gem_object *obj,
> -                          struct vm_area_struct *vma)
> -{
> -       struct virtio_gpu_object *bo = gem_to_virtio_gpu_obj(obj);
> -
> -       bo->gem_base.vma_node.vm_node.start = bo->tbo.vma_node.vm_node.start;
> -       return drm_gem_prime_mmap(obj, vma);
> -}
> diff --git a/drivers/gpu/drm/virtio/virtgpu_ttm.c b/drivers/gpu/drm/virtio/virtgpu_ttm.c
> deleted file mode 100644
> index 300ef3a83538..000000000000
> --- a/drivers/gpu/drm/virtio/virtgpu_ttm.c
> +++ /dev/null
> @@ -1,304 +0,0 @@
> -/*
> - * Copyright (C) 2015 Red Hat, Inc.
> - * All Rights Reserved.
> - *
> - * Authors:
> - *    Dave Airlie
> - *    Alon Levy
> - *
> - * 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, sublicense,
> - * 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 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 NONINFRINGEMENT.  IN NO EVENT SHALL
> - * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) 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.
> - */
> -
> -#include <drm/ttm/ttm_bo_api.h>
> -#include <drm/ttm/ttm_bo_driver.h>
> -#include <drm/ttm/ttm_placement.h>
> -#include <drm/ttm/ttm_page_alloc.h>
> -#include <drm/ttm/ttm_module.h>
> -#include <drm/drmP.h>
> -#include <drm/drm.h>
> -#include <drm/virtgpu_drm.h>
> -#include "virtgpu_drv.h"
> -
> -#include <linux/delay.h>
> -
> -static struct
> -virtio_gpu_device *virtio_gpu_get_vgdev(struct ttm_bo_device *bdev)
> -{
> -       struct virtio_gpu_mman *mman;
> -       struct virtio_gpu_device *vgdev;
> -
> -       mman = container_of(bdev, struct virtio_gpu_mman, bdev);
> -       vgdev = container_of(mman, struct virtio_gpu_device, mman);
> -       return vgdev;
> -}
> -
> -int virtio_gpu_mmap(struct file *filp, struct vm_area_struct *vma)
> -{
> -       struct drm_file *file_priv;
> -       struct virtio_gpu_device *vgdev;
> -       int r;
> -
> -       file_priv = filp->private_data;
> -       vgdev = file_priv->minor->dev->dev_private;
> -       if (vgdev == NULL) {
> -               DRM_ERROR(
> -                "filp->private_data->minor->dev->dev_private == NULL\n");
> -               return -EINVAL;
> -       }
> -       r = ttm_bo_mmap(filp, vma, &vgdev->mman.bdev);
> -
> -       return r;
> -}
> -
> -static int virtio_gpu_invalidate_caches(struct ttm_bo_device *bdev,
> -                                       uint32_t flags)
> -{
> -       return 0;
> -}
> -
> -static int ttm_bo_man_get_node(struct ttm_mem_type_manager *man,
> -                              struct ttm_buffer_object *bo,
> -                              const struct ttm_place *place,
> -                              struct ttm_mem_reg *mem)
> -{
> -       mem->mm_node = (void *)1;
> -       return 0;
> -}
> -
> -static void ttm_bo_man_put_node(struct ttm_mem_type_manager *man,
> -                               struct ttm_mem_reg *mem)
> -{
> -       mem->mm_node = (void *)NULL;
> -}
> -
> -static int ttm_bo_man_init(struct ttm_mem_type_manager *man,
> -                          unsigned long p_size)
> -{
> -       return 0;
> -}
> -
> -static int ttm_bo_man_takedown(struct ttm_mem_type_manager *man)
> -{
> -       return 0;
> -}
> -
> -static void ttm_bo_man_debug(struct ttm_mem_type_manager *man,
> -                            struct drm_printer *printer)
> -{
> -}
> -
> -static const struct ttm_mem_type_manager_func virtio_gpu_bo_manager_func = {
> -       .init = ttm_bo_man_init,
> -       .takedown = ttm_bo_man_takedown,
> -       .get_node = ttm_bo_man_get_node,
> -       .put_node = ttm_bo_man_put_node,
> -       .debug = ttm_bo_man_debug
> -};
> -
> -static int virtio_gpu_init_mem_type(struct ttm_bo_device *bdev, uint32_t type,
> -                                   struct ttm_mem_type_manager *man)
> -{
> -       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 = &virtio_gpu_bo_manager_func;
> -               man->flags = TTM_MEMTYPE_FLAG_MAPPABLE;
> -               man->available_caching = TTM_PL_MASK_CACHING;
> -               man->default_caching = TTM_PL_FLAG_CACHED;
> -               break;
> -       default:
> -               DRM_ERROR("Unsupported memory type %u\n", (unsigned int)type);
> -               return -EINVAL;
> -       }
> -       return 0;
> -}
> -
> -static void virtio_gpu_evict_flags(struct ttm_buffer_object *bo,
> -                               struct ttm_placement *placement)
> -{
> -       static const struct ttm_place placements = {
> -               .fpfn  = 0,
> -               .lpfn  = 0,
> -               .flags = TTM_PL_MASK_CACHING | TTM_PL_FLAG_SYSTEM,
> -       };
> -
> -       placement->placement = &placements;
> -       placement->busy_placement = &placements;
> -       placement->num_placement = 1;
> -       placement->num_busy_placement = 1;
> -}
> -
> -static int virtio_gpu_verify_access(struct ttm_buffer_object *bo,
> -                                   struct file *filp)
> -{
> -       return 0;
> -}
> -
> -static int virtio_gpu_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];
> -
> -       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:
> -       case TTM_PL_TT:
> -               /* system memory */
> -               return 0;
> -       default:
> -               return -EINVAL;
> -       }
> -       return 0;
> -}
> -
> -static void virtio_gpu_ttm_io_mem_free(struct ttm_bo_device *bdev,
> -                                      struct ttm_mem_reg *mem)
> -{
> -}
> -
> -/*
> - * TTM backend functions.
> - */
> -struct virtio_gpu_ttm_tt {
> -       struct ttm_dma_tt               ttm;
> -       struct virtio_gpu_object        *obj;
> -};
> -
> -static int virtio_gpu_ttm_tt_bind(struct ttm_tt *ttm,
> -                                 struct ttm_mem_reg *bo_mem)
> -{
> -       struct virtio_gpu_ttm_tt *gtt =
> -               container_of(ttm, struct virtio_gpu_ttm_tt, ttm.ttm);
> -       struct virtio_gpu_device *vgdev =
> -               virtio_gpu_get_vgdev(gtt->obj->tbo.bdev);
> -
> -       virtio_gpu_object_attach(vgdev, gtt->obj, NULL);
> -       return 0;
> -}
> -
> -static int virtio_gpu_ttm_tt_unbind(struct ttm_tt *ttm)
> -{
> -       struct virtio_gpu_ttm_tt *gtt =
> -               container_of(ttm, struct virtio_gpu_ttm_tt, ttm.ttm);
> -       struct virtio_gpu_device *vgdev =
> -               virtio_gpu_get_vgdev(gtt->obj->tbo.bdev);
> -
> -       virtio_gpu_object_detach(vgdev, gtt->obj);
> -       return 0;
> -}
> -
> -static void virtio_gpu_ttm_tt_destroy(struct ttm_tt *ttm)
> -{
> -       struct virtio_gpu_ttm_tt *gtt =
> -               container_of(ttm, struct virtio_gpu_ttm_tt, ttm.ttm);
> -
> -       ttm_dma_tt_fini(&gtt->ttm);
> -       kfree(gtt);
> -}
> -
> -static struct ttm_backend_func virtio_gpu_tt_func = {
> -       .bind = &virtio_gpu_ttm_tt_bind,
> -       .unbind = &virtio_gpu_ttm_tt_unbind,
> -       .destroy = &virtio_gpu_ttm_tt_destroy,
> -};
> -
> -static struct ttm_tt *virtio_gpu_ttm_tt_create(struct ttm_buffer_object *bo,
> -                                              uint32_t page_flags)
> -{
> -       struct virtio_gpu_device *vgdev;
> -       struct virtio_gpu_ttm_tt *gtt;
> -
> -       vgdev = virtio_gpu_get_vgdev(bo->bdev);
> -       gtt = kzalloc(sizeof(struct virtio_gpu_ttm_tt), GFP_KERNEL);
> -       if (gtt == NULL)
> -               return NULL;
> -       gtt->ttm.ttm.func = &virtio_gpu_tt_func;
> -       gtt->obj = container_of(bo, struct virtio_gpu_object, tbo);
> -       if (ttm_dma_tt_init(&gtt->ttm, bo, page_flags)) {
> -               kfree(gtt);
> -               return NULL;
> -       }
> -       return &gtt->ttm.ttm;
> -}
> -
> -static void virtio_gpu_bo_swap_notify(struct ttm_buffer_object *tbo)
> -{
> -       struct virtio_gpu_object *bo;
> -
> -       bo = container_of(tbo, struct virtio_gpu_object, tbo);
> -
> -       if (bo->pages)
> -               virtio_gpu_object_free_sg_table(bo);
> -}
> -
> -static struct ttm_bo_driver virtio_gpu_bo_driver = {
> -       .ttm_tt_create = &virtio_gpu_ttm_tt_create,
> -       .invalidate_caches = &virtio_gpu_invalidate_caches,
> -       .init_mem_type = &virtio_gpu_init_mem_type,
> -       .eviction_valuable = ttm_bo_eviction_valuable,
> -       .evict_flags = &virtio_gpu_evict_flags,
> -       .verify_access = &virtio_gpu_verify_access,
> -       .io_mem_reserve = &virtio_gpu_ttm_io_mem_reserve,
> -       .io_mem_free = &virtio_gpu_ttm_io_mem_free,
> -       .swap_notify = &virtio_gpu_bo_swap_notify,
> -};
> -
> -int virtio_gpu_ttm_init(struct virtio_gpu_device *vgdev)
> -{
> -       int r;
> -
> -       /* No others user of address space so set it to 0 */
> -       r = ttm_bo_device_init(&vgdev->mman.bdev,
> -                              &virtio_gpu_bo_driver,
> -                              vgdev->ddev->anon_inode->i_mapping,
> -                              false);
> -       if (r) {
> -               DRM_ERROR("failed initializing buffer object driver(%d).\n", r);
> -               goto err_dev_init;
> -       }
> -
> -       r = ttm_bo_init_mm(&vgdev->mman.bdev, TTM_PL_TT, 0);
> -       if (r) {
> -               DRM_ERROR("Failed initializing GTT heap.\n");
> -               goto err_mm_init;
> -       }
> -       return 0;
> -
> -err_mm_init:
> -       ttm_bo_device_release(&vgdev->mman.bdev);
> -err_dev_init:
> -       return r;
> -}
> -
> -void virtio_gpu_ttm_fini(struct virtio_gpu_device *vgdev)
> -{
> -       ttm_bo_device_release(&vgdev->mman.bdev);
> -       DRM_INFO("virtio_gpu: ttm finalized\n");
> -}
> diff --git a/drivers/gpu/drm/virtio/virtgpu_vq.c b/drivers/gpu/drm/virtio/virtgpu_vq.c
> index 03b7e0845d98..fc908d5cb217 100644
> --- a/drivers/gpu/drm/virtio/virtgpu_vq.c
> +++ b/drivers/gpu/drm/virtio/virtgpu_vq.c
> @@ -979,17 +979,21 @@ int virtio_gpu_object_attach(struct virtio_gpu_device *vgdev,
>         bool use_dma_api = !virtio_has_iommu_quirk(vgdev->vdev);
>         struct virtio_gpu_mem_entry *ents;
>         struct scatterlist *sg;
> -       int si, nents;
> +       int si, nents, ret;
>
>         if (WARN_ON_ONCE(!obj->created))
>                 return -EINVAL;
> +       if (WARN_ON_ONCE(obj->pages))
> +               return -EINVAL;
>
> -       if (!obj->pages) {
> -               int ret;
> +       ret = drm_gem_shmem_pin(&obj->base.base);
> +       if (ret < 0)
> +               return -EINVAL;
>
> -               ret = virtio_gpu_object_get_sg_table(vgdev, obj);
> -               if (ret)
> -                       return ret;
> +       obj->pages = drm_gem_shmem_get_sg_table(&obj->base.base);
> +       if (obj->pages == NULL) {
> +               drm_gem_shmem_unpin(&obj->base.base);
> +               return -EINVAL;
>         }
>
>         if (use_dma_api) {
> @@ -1028,6 +1032,9 @@ void virtio_gpu_object_detach(struct virtio_gpu_device *vgdev,
>  {
>         bool use_dma_api = !virtio_has_iommu_quirk(vgdev->vdev);
>
> +       if (WARN_ON_ONCE(!obj->pages))
> +               return;
> +
>         if (use_dma_api && obj->mapped) {
>                 struct virtio_gpu_fence *fence = virtio_gpu_fence_alloc(vgdev);
>                 /* detach backing and wait for the host process it ... */
> @@ -1043,6 +1050,11 @@ void virtio_gpu_object_detach(struct virtio_gpu_device *vgdev,
>         } else {
>                 virtio_gpu_cmd_resource_inval_backing(vgdev, obj->hw_res_handle, NULL);
>         }
> +
> +       sg_free_table(obj->pages);
> +       obj->pages = NULL;
> +
> +       drm_gem_shmem_unpin(&obj->base.base);
>  }
>
>  void virtio_gpu_cursor_ping(struct virtio_gpu_device *vgdev,
> diff --git a/drivers/gpu/drm/virtio/Kconfig b/drivers/gpu/drm/virtio/Kconfig
> index ba36e933bb49..eff3047052d4 100644
> --- a/drivers/gpu/drm/virtio/Kconfig
> +++ b/drivers/gpu/drm/virtio/Kconfig
> @@ -3,7 +3,7 @@ config DRM_VIRTIO_GPU
>         tristate "Virtio GPU driver"
>         depends on DRM && VIRTIO && MMU
>         select DRM_KMS_HELPER
> -       select DRM_TTM
> +       select DRM_GEM_SHMEM_HELPER
>         help
>            This is the virtual GPU driver for virtio.  It can be used with
>            QEMU based VMMs (like KVM or Xen).
> diff --git a/drivers/gpu/drm/virtio/Makefile b/drivers/gpu/drm/virtio/Makefile
> index 458e606a936f..92aa2b3d349d 100644
> --- a/drivers/gpu/drm/virtio/Makefile
> +++ b/drivers/gpu/drm/virtio/Makefile
> @@ -4,7 +4,7 @@
>  # Direct Rendering Infrastructure (DRI) in XFree86 4.1.0 and higher.
>
>  virtio-gpu-y := virtgpu_drv.o virtgpu_kms.o virtgpu_gem.o \
> -       virtgpu_display.o virtgpu_vq.o virtgpu_ttm.o \
> +       virtgpu_display.o virtgpu_vq.o \
>         virtgpu_fence.o virtgpu_object.o virtgpu_debugfs.o virtgpu_plane.o \
>         virtgpu_ioctl.o virtgpu_prime.o virtgpu_trace_points.o
>
> --
> 2.18.1
>
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