linux-kernel - Re: [PATCH v2 1/5] drm/msm: Expose our reservation object when exporting a dmabuf.

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Date:   Tue, 2 May 2017 06:20:06 -0400
From:   Rob Clark <robdclark@...il.com>
To:     Eric Anholt <eric@...olt.net>
Cc:     "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        stable <stable@...r.kernel.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        freedreno <freedreno@...ts.freedesktop.org>
Subject: Re: [PATCH v2 1/5] drm/msm: Expose our reservation object when
 exporting a dmabuf.

On Wed, Apr 12, 2017 at 3:11 PM, Eric Anholt <eric@...olt.net> wrote:
> Without this, polling on the dma-buf (and presumably other devices
> synchronizing against our rendering) would return immediately, even
> while the BO was busy.
>
> Signed-off-by: Eric Anholt <eric@...olt.net>
> Reviewed-by: Daniel Vetter <daniel.vetter@...ll.ch>
> Cc: stable@...r.kernel.org
> Cc: Rob Clark <robdclark@...il.com>
> Cc: linux-arm-msm@...r.kernel.org
> Cc: freedreno@...ts.freedesktop.org

Reviewed-by: Rob Clark <robdclark@...il.com>

(go ahead and push via drm-misc with the rest of the series, if you
haven't already)


> ---
>  drivers/gpu/drm/msm/msm_drv.c       | 1 +
>  drivers/gpu/drm/msm/msm_drv.h       | 1 +
>  drivers/gpu/drm/msm/msm_gem_prime.c | 7 +++++++
>  3 files changed, 9 insertions(+)
>
> diff --git a/drivers/gpu/drm/msm/msm_drv.c b/drivers/gpu/drm/msm/msm_drv.c
> index 9208e67be453..fe728a134e16 100644
> --- a/drivers/gpu/drm/msm/msm_drv.c
> +++ b/drivers/gpu/drm/msm/msm_drv.c
> @@ -829,6 +829,7 @@ static struct drm_driver msm_driver = {
>         .prime_fd_to_handle = drm_gem_prime_fd_to_handle,
>         .gem_prime_export   = drm_gem_prime_export,
>         .gem_prime_import   = drm_gem_prime_import,
> +       .gem_prime_res_obj  = msm_gem_prime_res_obj,
>         .gem_prime_pin      = msm_gem_prime_pin,
>         .gem_prime_unpin    = msm_gem_prime_unpin,
>         .gem_prime_get_sg_table = msm_gem_prime_get_sg_table,
> diff --git a/drivers/gpu/drm/msm/msm_drv.h b/drivers/gpu/drm/msm/msm_drv.h
> index b885c3d5ae4d..5e67fa66d483 100644
> --- a/drivers/gpu/drm/msm/msm_drv.h
> +++ b/drivers/gpu/drm/msm/msm_drv.h
> @@ -223,6 +223,7 @@ struct sg_table *msm_gem_prime_get_sg_table(struct drm_gem_object *obj);
>  void *msm_gem_prime_vmap(struct drm_gem_object *obj);
>  void msm_gem_prime_vunmap(struct drm_gem_object *obj, void *vaddr);
>  int msm_gem_prime_mmap(struct drm_gem_object *obj, struct vm_area_struct *vma);
> +struct reservation_object *msm_gem_prime_res_obj(struct drm_gem_object *obj);
>  struct drm_gem_object *msm_gem_prime_import_sg_table(struct drm_device *dev,
>                 struct dma_buf_attachment *attach, struct sg_table *sg);
>  int msm_gem_prime_pin(struct drm_gem_object *obj);
> diff --git a/drivers/gpu/drm/msm/msm_gem_prime.c b/drivers/gpu/drm/msm/msm_gem_prime.c
> index 60bb290700ce..13403c6da6c7 100644
> --- a/drivers/gpu/drm/msm/msm_gem_prime.c
> +++ b/drivers/gpu/drm/msm/msm_gem_prime.c
> @@ -70,3 +70,10 @@ void msm_gem_prime_unpin(struct drm_gem_object *obj)
>         if (!obj->import_attach)
>                 msm_gem_put_pages(obj);
>  }
> +
> +struct reservation_object *msm_gem_prime_res_obj(struct drm_gem_object *obj)
> +{
> +       struct msm_gem_object *msm_obj = to_msm_bo(obj);
> +
> +       return msm_obj->resv;
> +}
> --
> 2.11.0
>