linux-kernel - Re: [PATCH v2 v3.18-rc4 3/4] drm: msm: Allow exported dma-bufs to be mapped

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Message-ID: <CAF6AEGueR2Q4pMjgyQS6t+ZPCndW=H4bVWrcn0Q_yO67kRXEmA@mail.gmail.com>
Date:	Wed, 12 Nov 2014 09:26:47 -0500
From:	Rob Clark <robdclark@...il.com>
To:	Daniel Thompson <daniel.thompson@...aro.org>
Cc:	David Airlie <airlied@...ux.ie>,
	"dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
	Benjamin Gaignard <benjamin.gaignard@...aro.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"patches@...aro.org" <patches@...aro.org>,
	linaro-kernel@...ts.linaro.org,
	John Stultz <john.stultz@...aro.org>,
	Sumit Semwal <sumit.semwal@...aro.org>
Subject: Re: [PATCH v2 v3.18-rc4 3/4] drm: msm: Allow exported dma-bufs to be mapped

On Wed, Nov 12, 2014 at 6:38 AM, Daniel Thompson
<daniel.thompson@...aro.org> wrote:
> Currently msm does not implement gem_prime_mmap. Without this it is not
> possible to draw onto a dma-buf from userspace (making its very hard to
> implement the Android rendering model).
>
> Fixing this is just a matter of adding a little boilerplate.

looks good.. I'll queue it up for my 3.19 pull req.  Thanks!

BR,
-R


> Signed-off-by: Daniel Thompson <daniel.thompson@...aro.org>
> ---
>  drivers/gpu/drm/msm/msm_drv.c       |  1 +
>  drivers/gpu/drm/msm/msm_drv.h       |  3 +++
>  drivers/gpu/drm/msm/msm_gem_prime.c | 13 +++++++++++++
>  3 files changed, 17 insertions(+)
>
> diff --git a/drivers/gpu/drm/msm/msm_drv.c b/drivers/gpu/drm/msm/msm_drv.c
> index b67ef5985125..5717d4ec1a2c 100644
> --- a/drivers/gpu/drm/msm/msm_drv.c
> +++ b/drivers/gpu/drm/msm/msm_drv.c
> @@ -832,6 +832,7 @@ static struct drm_driver msm_driver = {
>         .gem_prime_import_sg_table = msm_gem_prime_import_sg_table,
>         .gem_prime_vmap     = msm_gem_prime_vmap,
>         .gem_prime_vunmap   = msm_gem_prime_vunmap,
> +       .gem_prime_mmap     = msm_gem_prime_mmap,
>  #ifdef CONFIG_DEBUG_FS
>         .debugfs_init       = msm_debugfs_init,
>         .debugfs_cleanup    = msm_debugfs_cleanup,
> diff --git a/drivers/gpu/drm/msm/msm_drv.h b/drivers/gpu/drm/msm/msm_drv.h
> index 67f9d0a2332c..1a7344066154 100644
> --- a/drivers/gpu/drm/msm/msm_drv.h
> +++ b/drivers/gpu/drm/msm/msm_drv.h
> @@ -154,6 +154,8 @@ void msm_update_fence(struct drm_device *dev, uint32_t fence);
>  int msm_ioctl_gem_submit(struct drm_device *dev, void *data,
>                 struct drm_file *file);
>
> +int msm_gem_mmap_obj(struct drm_gem_object *obj,
> +                       struct vm_area_struct *vma);
>  int msm_gem_mmap(struct file *filp, struct vm_area_struct *vma);
>  int msm_gem_fault(struct vm_area_struct *vma, struct vm_fault *vmf);
>  uint64_t msm_gem_mmap_offset(struct drm_gem_object *obj);
> @@ -170,6 +172,7 @@ int msm_gem_dumb_map_offset(struct drm_file *file, struct drm_device *dev,
>  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 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 ad772fe36115..dd7a7ab603e2 100644
> --- a/drivers/gpu/drm/msm/msm_gem_prime.c
> +++ b/drivers/gpu/drm/msm/msm_gem_prime.c
> @@ -37,6 +37,19 @@ void msm_gem_prime_vunmap(struct drm_gem_object *obj, void *vaddr)
>         /* TODO msm_gem_vunmap() */
>  }
>
> +int msm_gem_prime_mmap(struct drm_gem_object *obj, struct vm_area_struct *vma)
> +{
> +       int ret;
> +
> +       mutex_lock(&obj->dev->struct_mutex);
> +       ret = drm_gem_mmap_obj(obj, obj->size, vma);
> +       mutex_unlock(&obj->dev->struct_mutex);
> +       if (ret < 0)
> +               return ret;
> +
> +       return msm_gem_mmap_obj(vma->vm_private_data, vma);
> +}
> +
>  struct drm_gem_object *msm_gem_prime_import_sg_table(struct drm_device *dev,
>                 struct dma_buf_attachment *attach, struct sg_table *sg)
>  {
> --
> 1.9.3
>
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