[PATCH] drm/mediatek: Implement mmap as GEM object function

[Thomas Zimmermann]

ping for review

Am 24.06.21 um 11:01 schrieb Thomas Zimmermann:
> Moving the driver-specific mmap code into a GEM object function allows
> for using DRM helpers for various mmap callbacks.
> 
> The respective mediatek functions are being removed. The file_operations
> structure fops is now being created by the helper macro
> DEFINE_DRM_GEM_FOPS().
> 
> Signed-off-by: Thomas Zimmermann <tzimmermann at suse.de>
> ---
>   drivers/gpu/drm/mediatek/mtk_drm_drv.c | 13 ++------
>   drivers/gpu/drm/mediatek/mtk_drm_gem.c | 44 +++++++-------------------
>   drivers/gpu/drm/mediatek/mtk_drm_gem.h |  3 --
>   3 files changed, 14 insertions(+), 46 deletions(-)
> 
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_drv.c b/drivers/gpu/drm/mediatek/mtk_drm_drv.c
> index b46bdb8985da..bbfefb29c211 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_drv.c
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_drv.c
> @@ -300,16 +300,7 @@ static void mtk_drm_kms_deinit(struct drm_device *drm)
>   	component_unbind_all(drm->dev, drm);
>   }
>   
> -static const struct file_operations mtk_drm_fops = {
> -	.owner = THIS_MODULE,
> -	.open = drm_open,
> -	.release = drm_release,
> -	.unlocked_ioctl = drm_ioctl,
> -	.mmap = mtk_drm_gem_mmap,
> -	.poll = drm_poll,
> -	.read = drm_read,
> -	.compat_ioctl = drm_compat_ioctl,
> -};
> +DEFINE_DRM_GEM_FOPS(mtk_drm_fops);
>   
>   /*
>    * We need to override this because the device used to import the memory is
> @@ -332,7 +323,7 @@ static const struct drm_driver mtk_drm_driver = {
>   	.prime_fd_to_handle = drm_gem_prime_fd_to_handle,
>   	.gem_prime_import = mtk_drm_gem_prime_import,
>   	.gem_prime_import_sg_table = mtk_gem_prime_import_sg_table,
> -	.gem_prime_mmap = mtk_drm_gem_mmap_buf,
> +	.gem_prime_mmap = drm_gem_prime_mmap,
>   	.fops = &mtk_drm_fops,
>   
>   	.name = DRIVER_NAME,
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_gem.c b/drivers/gpu/drm/mediatek/mtk_drm_gem.c
> index 280ea0d5e840..d0544962cfc1 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_gem.c
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_gem.c
> @@ -14,11 +14,14 @@
>   #include "mtk_drm_drv.h"
>   #include "mtk_drm_gem.h"
>   
> +static int mtk_drm_gem_object_mmap(struct drm_gem_object *obj, struct vm_area_struct *vma);
> +
>   static const struct drm_gem_object_funcs mtk_drm_gem_object_funcs = {
>   	.free = mtk_drm_gem_free_object,
>   	.get_sg_table = mtk_gem_prime_get_sg_table,
>   	.vmap = mtk_drm_gem_prime_vmap,
>   	.vunmap = mtk_drm_gem_prime_vunmap,
> +	.mmap = mtk_drm_gem_object_mmap,
>   	.vm_ops = &drm_gem_cma_vm_ops,
>   };
>   
> @@ -145,11 +148,19 @@ static int mtk_drm_gem_object_mmap(struct drm_gem_object *obj,
>   	struct mtk_drm_gem_obj *mtk_gem = to_mtk_gem_obj(obj);
>   	struct mtk_drm_private *priv = obj->dev->dev_private;
>   
> +	/*
> +	 * Set vm_pgoff (used as a fake buffer offset by DRM) to 0 and map the
> +	 * whole buffer from the start.
> +	 */
> +	vma->vm_pgoff = 0;
> +
>   	/*
>   	 * dma_alloc_attrs() allocated a struct page table for mtk_gem, so clear
>   	 * VM_PFNMAP flag that was set by drm_gem_mmap_obj()/drm_gem_mmap().
>   	 */
> -	vma->vm_flags &= ~VM_PFNMAP;
> +	vma->vm_flags |= VM_IO | VM_DONTEXPAND | VM_DONTDUMP;
> +	vma->vm_page_prot = pgprot_writecombine(vm_get_page_prot(vma->vm_flags));
> +	vma->vm_page_prot = pgprot_decrypted(vma->vm_page_prot);
>   
>   	ret = dma_mmap_attrs(priv->dma_dev, vma, mtk_gem->cookie,
>   			     mtk_gem->dma_addr, obj->size, mtk_gem->dma_attrs);
> @@ -159,37 +170,6 @@ static int mtk_drm_gem_object_mmap(struct drm_gem_object *obj,
>   	return ret;
>   }
>   
> -int mtk_drm_gem_mmap_buf(struct drm_gem_object *obj, struct vm_area_struct *vma)
> -{
> -	int ret;
> -
> -	ret = drm_gem_mmap_obj(obj, obj->size, vma);
> -	if (ret)
> -		return ret;
> -
> -	return mtk_drm_gem_object_mmap(obj, vma);
> -}
> -
> -int mtk_drm_gem_mmap(struct file *filp, struct vm_area_struct *vma)
> -{
> -	struct drm_gem_object *obj;
> -	int ret;
> -
> -	ret = drm_gem_mmap(filp, vma);
> -	if (ret)
> -		return ret;
> -
> -	obj = vma->vm_private_data;
> -
> -	/*
> -	 * Set vm_pgoff (used as a fake buffer offset by DRM) to 0 and map the
> -	 * whole buffer from the start.
> -	 */
> -	vma->vm_pgoff = 0;
> -
> -	return mtk_drm_gem_object_mmap(obj, vma);
> -}
> -
>   /*
>    * Allocate a sg_table for this GEM object.
>    * Note: Both the table's contents, and the sg_table itself must be freed by
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_gem.h b/drivers/gpu/drm/mediatek/mtk_drm_gem.h
> index 6da5ccb4b933..9a359a06cb73 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_gem.h
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_gem.h
> @@ -39,9 +39,6 @@ struct mtk_drm_gem_obj *mtk_drm_gem_create(struct drm_device *dev, size_t size,
>   					   bool alloc_kmap);
>   int mtk_drm_gem_dumb_create(struct drm_file *file_priv, struct drm_device *dev,
>   			    struct drm_mode_create_dumb *args);
> -int mtk_drm_gem_mmap(struct file *filp, struct vm_area_struct *vma);
> -int mtk_drm_gem_mmap_buf(struct drm_gem_object *obj,
> -			 struct vm_area_struct *vma);
>   struct sg_table *mtk_gem_prime_get_sg_table(struct drm_gem_object *obj);
>   struct drm_gem_object *mtk_gem_prime_import_sg_table(struct drm_device *dev,
>   			struct dma_buf_attachment *attach, struct sg_table *sg);
> 

-- 
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Maxfeldstr. 5, 90409 Nürnberg, Germany
(HRB 36809, AG Nürnberg)
Geschäftsführer: Felix Imendörffer

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