Re: [PATCH 9/9] drm/exynos: Convert g2d_userptr_get_dma_addr() to use get_vaddr_frames()

[Inki Dae <inki.dae@samsung.com>]

Hi,

On 2015년 05월 13일 22:08, Jan Kara wrote:
> Convert g2d_userptr_get_dma_addr() to pin pages using get_vaddr_frames().
> This removes the knowledge about vmas and mmap_sem locking from exynos
> driver. Also it fixes a problem that the function has been mapping user
> provided address without holding mmap_sem.
> 
> Signed-off-by: Jan Kara <jack@suse.cz>
> ---
>  drivers/gpu/drm/exynos/exynos_drm_g2d.c | 89 ++++++++++--------------------
>  drivers/gpu/drm/exynos/exynos_drm_gem.c | 97 ---------------------------------
>  2 files changed, 29 insertions(+), 157 deletions(-)
> 
> diff --git a/drivers/gpu/drm/exynos/exynos_drm_g2d.c b/drivers/gpu/drm/exynos/exynos_drm_g2d.c
> index 81a250830808..265519c0fe2d 100644
> --- a/drivers/gpu/drm/exynos/exynos_drm_g2d.c
> +++ b/drivers/gpu/drm/exynos/exynos_drm_g2d.c
> @@ -190,10 +190,8 @@ struct g2d_cmdlist_userptr {
>  	dma_addr_t		dma_addr;
>  	unsigned long		userptr;
>  	unsigned long		size;
> -	struct page		**pages;
> -	unsigned int		npages;
> +	struct frame_vector	*vec;
>  	struct sg_table		*sgt;
> -	struct vm_area_struct	*vma;
>  	atomic_t		refcount;
>  	bool			in_pool;
>  	bool			out_of_list;
> @@ -363,6 +361,7 @@ static void g2d_userptr_put_dma_addr(struct drm_device *drm_dev,
>  {
>  	struct g2d_cmdlist_userptr *g2d_userptr =
>  					(struct g2d_cmdlist_userptr *)obj;
> +	struct page **pages;
>  
>  	if (!obj)
>  		return;
> @@ -382,19 +381,21 @@ out:
>  	exynos_gem_unmap_sgt_from_dma(drm_dev, g2d_userptr->sgt,
>  					DMA_BIDIRECTIONAL);
>  
> -	exynos_gem_put_pages_to_userptr(g2d_userptr->pages,
> -					g2d_userptr->npages,
> -					g2d_userptr->vma);
> +	pages = frame_vector_pages(g2d_userptr->vec);
> +	if (!IS_ERR(pages)) {
> +		int i;
>  
> -	exynos_gem_put_vma(g2d_userptr->vma);
> +		for (i = 0; i < frame_vector_count(g2d_userptr->vec); i++)
> +			set_page_dirty_lock(pages[i]);
> +	}
> +	put_vaddr_frames(g2d_userptr->vec);
> +	frame_vector_destroy(g2d_userptr->vec);
>  
>  	if (!g2d_userptr->out_of_list)
>  		list_del_init(&g2d_userptr->list);
>  
>  	sg_free_table(g2d_userptr->sgt);
>  	kfree(g2d_userptr->sgt);
> -
> -	drm_free_large(g2d_userptr->pages);
>  	kfree(g2d_userptr);
>  }
>  
> @@ -413,6 +414,7 @@ static dma_addr_t *g2d_userptr_get_dma_addr(struct drm_device *drm_dev,
>  	struct vm_area_struct *vma;
>  	unsigned long start, end;
>  	unsigned int npages, offset;
> +	struct frame_vector *vec;
>  	int ret;
>  
>  	if (!size) {
> @@ -456,65 +458,37 @@ static dma_addr_t *g2d_userptr_get_dma_addr(struct drm_device *drm_dev,
>  		return ERR_PTR(-ENOMEM);
>  
>  	atomic_set(&g2d_userptr->refcount, 1);
> +	g2d_userptr->size = size;
>  
>  	start = userptr & PAGE_MASK;
>  	offset = userptr & ~PAGE_MASK;
>  	end = PAGE_ALIGN(userptr + size);
>  	npages = (end - start) >> PAGE_SHIFT;
> -	g2d_userptr->npages = npages;
> -
> -	pages = drm_calloc_large(npages, sizeof(struct page *));

The declaration to pages isn't needed anymore because you removed it.

> -	if (!pages) {
> -		DRM_ERROR("failed to allocate pages.\n");
> -		ret = -ENOMEM;
> +	vec = g2d_userptr->vec = frame_vector_create(npages);

I think you can use g2d_userptr->vec so it seems that vec isn't needed.

> +	if (!vec)
>  		goto err_free;
> -	}
>  
> -	down_read(&current->mm->mmap_sem);
> -	vma = find_vma(current->mm, userptr);

For vma, ditto.

Thanks,
Inki Dae

[--SNIP--]
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