linux-kernel - Re: [PATCH v3 07/11] drm/ttm: rename ttm_fbdev

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Date:   Thu, 19 Sep 2019 13:25:39 +0200
From:   Thomas Zimmermann <tzimmermann@...e.de>
To:     Gerd Hoffmann <kraxel@...hat.com>, dri-devel@...ts.freedesktop.org
Cc:     Daniel Vetter <daniel.vetter@...ll.ch>,
        Alex Deucher <alexander.deucher@....com>,
        Christian König <christian.koenig@....com>,
        "David (ChunMing) Zhou" <David1.Zhou@....com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>, Huang Rui <ray.huang@....com>,
        "open list:RADEON and AMDGPU DRM DRIVERS" 
        <amd-gfx@...ts.freedesktop.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 07/11] drm/ttm: rename ttm_fbdev_mmap

Hi

Am 19.09.19 um 12:02 schrieb Gerd Hoffmann:
> Rename ttm_fbdev_mmap to ttm_bo_mmap_obj.  Move the vm_pgoff sanity
> check to amdgpu_bo_fbdev_mmap (only ttm_fbdev_mmap user in tree).
> 
> The ttm_bo_mmap_obj function can now be used to map any buffer object.
> This allows to implement &drm_gem_object_funcs.mmap in gem ttm helpers.
> 
> Signed-off-by: Gerd Hoffmann <kraxel@...hat.com>

Thanks. I find this to be a much cleaner interface than before.

Acked-by: Thomas Zimmermann <tzimmermann@...e.de>

Best regards
Thomas

> ---
>  include/drm/ttm/ttm_bo_api.h               | 10 ++++------
>  drivers/gpu/drm/amd/amdgpu/amdgpu_object.c |  5 ++++-
>  drivers/gpu/drm/ttm/ttm_bo_vm.c            |  8 ++------
>  3 files changed, 10 insertions(+), 13 deletions(-)
> 
> diff --git a/include/drm/ttm/ttm_bo_api.h b/include/drm/ttm/ttm_bo_api.h
> index 43c4929a2171..d2277e06316d 100644
> --- a/include/drm/ttm/ttm_bo_api.h
> +++ b/include/drm/ttm/ttm_bo_api.h
> @@ -710,16 +710,14 @@ int ttm_bo_kmap(struct ttm_buffer_object *bo, unsigned long start_page,
>  void ttm_bo_kunmap(struct ttm_bo_kmap_obj *map);
>  
>  /**
> - * ttm_fbdev_mmap - mmap fbdev memory backed by a ttm buffer object.
> + * ttm_bo_mmap_obj - mmap memory backed by a ttm buffer object.
>   *
>   * @vma:       vma as input from the fbdev mmap method.
> - * @bo:        The bo backing the address space. The address space will
> - * have the same size as the bo, and start at offset 0.
> + * @bo:        The bo backing the address space.
>   *
> - * This function is intended to be called by the fbdev mmap method
> - * if the fbdev address space is to be backed by a bo.
> + * Maps a buffer object.
>   */
> -int ttm_fbdev_mmap(struct vm_area_struct *vma, struct ttm_buffer_object *bo);
> +int ttm_bo_mmap_obj(struct vm_area_struct *vma, struct ttm_buffer_object *bo);
>  
>  /**
>   * ttm_bo_mmap - mmap out of the ttm device address space.
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
> index 2f11ebd95528..e5447e0d8b88 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
> @@ -1051,7 +1051,10 @@ void amdgpu_bo_fini(struct amdgpu_device *adev)
>  int amdgpu_bo_fbdev_mmap(struct amdgpu_bo *bo,
>  			     struct vm_area_struct *vma)
>  {
> -	return ttm_fbdev_mmap(vma, &bo->tbo);
> +	if (vma->vm_pgoff != 0)
> +		return -EACCES;
> +
> +	return ttm_bo_mmap_obj(vma, &bo->tbo);
>  }
>  
>  /**
> diff --git a/drivers/gpu/drm/ttm/ttm_bo_vm.c b/drivers/gpu/drm/ttm/ttm_bo_vm.c
> index b5314ef85a3d..6688d7893161 100644
> --- a/drivers/gpu/drm/ttm/ttm_bo_vm.c
> +++ b/drivers/gpu/drm/ttm/ttm_bo_vm.c
> @@ -479,14 +479,10 @@ int ttm_bo_mmap(struct file *filp, struct vm_area_struct *vma,
>  }
>  EXPORT_SYMBOL(ttm_bo_mmap);
>  
> -int ttm_fbdev_mmap(struct vm_area_struct *vma, struct ttm_buffer_object *bo)
> +int ttm_bo_mmap_obj(struct vm_area_struct *vma, struct ttm_buffer_object *bo)
>  {
> -	if (vma->vm_pgoff != 0)
> -		return -EACCES;
> -
>  	ttm_bo_get(bo);
> -
>  	ttm_bo_mmap_vma_setup(bo, vma);
>  	return 0;
>  }
> -EXPORT_SYMBOL(ttm_fbdev_mmap);
> +EXPORT_SYMBOL(ttm_bo_mmap_obj);
> 

-- 
Thomas Zimmermann
Graphics Driver Developer
SUSE Linux GmbH, Maxfeldstrasse 5, 90409 Nuernberg, Germany
GF: Felix Imendörffer, Mary Higgins, Sri Rasiah
HRB 21284 (AG Nürnberg)



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