Why is the patch below marked for the -stable tree?  It looks to add a
new feature, not fix an existing problem.  Or am I missing something?

thanks,

greg k-h

On Fri, Sep 14, 2012 at 10:55:49PM -0400, Gregs git-bot wrote:
> commit: 5e1782d224c79b26ab7d5c31e3f87657000714fb
> From: Dave Airlie <[email protected]>
> Date: Tue, 28 Aug 2012 01:53:54 +0000
> Subject: vmwgfx: add dumb ioctl support
> 
> Testing and works with the -modesetting driver,
> 
> Reviewed-by: Jakob Bornecrantz <[email protected]>
> Cc: [email protected]
> Signed-off-by: Dave Airlie <[email protected]>
> ---
>  drivers/gpu/drm/vmwgfx/vmwgfx_drv.c      |    5 ++
>  drivers/gpu/drm/vmwgfx/vmwgfx_drv.h      |   10 ++++
>  drivers/gpu/drm/vmwgfx/vmwgfx_resource.c |   73 
> ++++++++++++++++++++++++++++++
>  3 files changed, 88 insertions(+), 0 deletions(-)
> 
> diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c 
> b/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c
> index 33bfc20..ba2c35d 100644
> --- a/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c
> +++ b/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c
> @@ -1155,6 +1155,11 @@ static struct drm_driver driver = {
>       .open = vmw_driver_open,
>       .preclose = vmw_preclose,
>       .postclose = vmw_postclose,
> +
> +     .dumb_create = vmw_dumb_create,
> +     .dumb_map_offset = vmw_dumb_map_offset,
> +     .dumb_destroy = vmw_dumb_destroy,
> +
>       .fops = &vmwgfx_driver_fops,
>       .name = VMWGFX_DRIVER_NAME,
>       .desc = VMWGFX_DRIVER_DESC,
> diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_drv.h 
> b/drivers/gpu/drm/vmwgfx/vmwgfx_drv.h
> index d0f2c07..29c984f 100644
> --- a/drivers/gpu/drm/vmwgfx/vmwgfx_drv.h
> +++ b/drivers/gpu/drm/vmwgfx/vmwgfx_drv.h
> @@ -645,6 +645,16 @@ int vmw_kms_readback(struct vmw_private *dev_priv,
>  int vmw_kms_update_layout_ioctl(struct drm_device *dev, void *data,
>                               struct drm_file *file_priv);
>  
> +int vmw_dumb_create(struct drm_file *file_priv,
> +                 struct drm_device *dev,
> +                 struct drm_mode_create_dumb *args);
> +
> +int vmw_dumb_map_offset(struct drm_file *file_priv,
> +                     struct drm_device *dev, uint32_t handle,
> +                     uint64_t *offset);
> +int vmw_dumb_destroy(struct drm_file *file_priv,
> +                  struct drm_device *dev,
> +                  uint32_t handle);
>  /**
>   * Overlay control - vmwgfx_overlay.c
>   */
> diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_resource.c 
> b/drivers/gpu/drm/vmwgfx/vmwgfx_resource.c
> index 22bf9a2..2c6ffe0 100644
> --- a/drivers/gpu/drm/vmwgfx/vmwgfx_resource.c
> +++ b/drivers/gpu/drm/vmwgfx/vmwgfx_resource.c
> @@ -1917,3 +1917,76 @@ err_ref:
>       vmw_resource_unreference(&res);
>       return ret;
>  }
> +
> +
> +int vmw_dumb_create(struct drm_file *file_priv,
> +                 struct drm_device *dev,
> +                 struct drm_mode_create_dumb *args)
> +{
> +     struct vmw_private *dev_priv = vmw_priv(dev);
> +     struct vmw_master *vmaster = vmw_master(file_priv->master);
> +     struct vmw_user_dma_buffer *vmw_user_bo;
> +     struct ttm_buffer_object *tmp;
> +     int ret;
> +
> +     args->pitch = args->width * ((args->bpp + 7) / 8);
> +     args->size = args->pitch * args->height;
> +
> +     vmw_user_bo = kzalloc(sizeof(*vmw_user_bo), GFP_KERNEL);
> +     if (vmw_user_bo == NULL)
> +             return -ENOMEM;
> +
> +     ret = ttm_read_lock(&vmaster->lock, true);
> +     if (ret != 0) {
> +             kfree(vmw_user_bo);
> +             return ret;
> +     }
> +
> +     ret = vmw_dmabuf_init(dev_priv, &vmw_user_bo->dma, args->size,
> +                           &vmw_vram_sys_placement, true,
> +                           &vmw_user_dmabuf_destroy);
> +     if (ret != 0)
> +             goto out_no_dmabuf;
> +
> +     tmp = ttm_bo_reference(&vmw_user_bo->dma.base);
> +     ret = ttm_base_object_init(vmw_fpriv(file_priv)->tfile,
> +                                &vmw_user_bo->base,
> +                                false,
> +                                ttm_buffer_type,
> +                                &vmw_user_dmabuf_release, NULL);
> +     if (unlikely(ret != 0))
> +             goto out_no_base_object;
> +
> +     args->handle = vmw_user_bo->base.hash.key;
> +
> +out_no_base_object:
> +     ttm_bo_unref(&tmp);
> +out_no_dmabuf:
> +     ttm_read_unlock(&vmaster->lock);
> +     return ret;
> +}
> +
> +int vmw_dumb_map_offset(struct drm_file *file_priv,
> +                     struct drm_device *dev, uint32_t handle,
> +                     uint64_t *offset)
> +{
> +     struct ttm_object_file *tfile = vmw_fpriv(file_priv)->tfile;
> +     struct vmw_dma_buffer *out_buf;
> +     int ret;
> +
> +     ret = vmw_user_dmabuf_lookup(tfile, handle, &out_buf);
> +     if (ret != 0)
> +             return -EINVAL;
> +
> +     *offset = out_buf->base.addr_space_offset;
> +     vmw_dmabuf_unreference(&out_buf);
> +     return 0;
> +}
> +
> +int vmw_dumb_destroy(struct drm_file *file_priv,
> +                  struct drm_device *dev,
> +                  uint32_t handle)
> +{
> +     return ttm_ref_object_base_unref(vmw_fpriv(file_priv)->tfile,
> +                                      handle, TTM_REF_USAGE);
> +}
> -- 
> 1.7.3.4
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