linux-kernel - Re: [PATCH v4 6/9] iommu/dma-iommu.c: Convert to use vm_insert

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Date:   Wed, 19 Dec 2018 13:08:00 +0530
From:   Souptick Joarder <jrdr.linux@...il.com>
To:     Andrew Morton <akpm@...ux-foundation.org>,
        Matthew Wilcox <willy@...radead.org>,
        Michal Hocko <mhocko@...e.com>, joro@...tes.org
Cc:     iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
        Linux-MM <linux-mm@...ck.org>, robin.murphy@....com
Subject: Re: [PATCH v4 6/9] iommu/dma-iommu.c: Convert to use vm_insert_range

On Tue, Dec 18, 2018 at 1:50 AM Souptick Joarder <jrdr.linux@...il.com> wrote:
>
> Convert to use vm_insert_range() to map range of kernel
> memory to user vma.
>
> Signed-off-by: Souptick Joarder <jrdr.linux@...il.com>
> Reviewed-by: Matthew Wilcox <willy@...radead.org>

Cc'd: Robin Murphy
> ---
>  drivers/iommu/dma-iommu.c | 13 +++----------
>  1 file changed, 3 insertions(+), 10 deletions(-)
>
> diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c
> index d1b0475..de7ffd8 100644
> --- a/drivers/iommu/dma-iommu.c
> +++ b/drivers/iommu/dma-iommu.c
> @@ -622,17 +622,10 @@ struct page **iommu_dma_alloc(struct device *dev, size_t size, gfp_t gfp,
>
>  int iommu_dma_mmap(struct page **pages, size_t size, struct vm_area_struct *vma)
>  {
> -       unsigned long uaddr = vma->vm_start;
> -       unsigned int i, count = PAGE_ALIGN(size) >> PAGE_SHIFT;
> -       int ret = -ENXIO;
> +       unsigned long count = PAGE_ALIGN(size) >> PAGE_SHIFT;
>
> -       for (i = vma->vm_pgoff; i < count && uaddr < vma->vm_end; i++) {
> -               ret = vm_insert_page(vma, uaddr, pages[i]);
> -               if (ret)
> -                       break;
> -               uaddr += PAGE_SIZE;
> -       }
> -       return ret;
> +       return vm_insert_range(vma, vma->vm_start, pages + vma->vm_pgoff,
> +                               count - vma->vm_pgoff);
>  }
>
>  static dma_addr_t __iommu_dma_map(struct device *dev, phys_addr_t phys,
> --
> 1.9.1
>