linux-kernel - Re: [PATCH 1/2] mm/frame-vec: Drop gup_flags from get_vaddr

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Message-ID: <CAAFQd5AsFOau=m_3UPh2tKqwiUJaY4NH9HHrHJ17gbCLDgTNCQ@mail.gmail.com>
Date:   Fri, 2 Oct 2020 20:22:49 +0200
From:   Tomasz Figa <tfiga@...omium.org>
To:     Daniel Vetter <daniel.vetter@...ll.ch>
Cc:     DRI Development <dri-devel@...ts.freedesktop.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Daniel Vetter <daniel.vetter@...el.com>,
        Inki Dae <inki.dae@...sung.com>,
        Joonyoung Shim <jy0922.shim@...sung.com>,
        Seung-Woo Kim <sw0312.kim@...sung.com>,
        Kyungmin Park <kyungmin.park@...sung.com>,
        Kukjin Kim <kgene@...nel.org>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Pawel Osciak <pawel@...iak.com>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Oded Gabbay <oded.gabbay@...il.com>,
        Omer Shpigelman <oshpigelman@...ana.ai>,
        Tomer Tayar <ttayar@...ana.ai>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Pawel Piskorski <ppiskorski@...ana.ai>,
        "list@....net:IOMMU DRIVERS <iommu@...ts.linux-foundation.org>, Joerg
        Roedel <joro@...tes.org>," <linux-arm-kernel@...ts.infradead.org>,
        linux-samsung-soc <linux-samsung-soc@...r.kernel.org>,
        Linux Media Mailing List <linux-media@...r.kernel.org>,
        linux-mm@...ck.org
Subject: Re: [PATCH 1/2] mm/frame-vec: Drop gup_flags from get_vaddr_frames()

On Fri, Oct 2, 2020 at 7:53 PM Daniel Vetter <daniel.vetter@...ll.ch> wrote:
>
> FOLL_WRITE | FOLL_FORCE is really the only reasonable thing to do for
> simple dma device that can't guarantee write protection. Which is also
> what all the callers are using.
>
> So just simplify this.
>
> Signed-off-by: Daniel Vetter <daniel.vetter@...el.com>
> Cc: Inki Dae <inki.dae@...sung.com>
> Cc: Joonyoung Shim <jy0922.shim@...sung.com>
> Cc: Seung-Woo Kim <sw0312.kim@...sung.com>
> Cc: Kyungmin Park <kyungmin.park@...sung.com>
> Cc: Kukjin Kim <kgene@...nel.org>
> Cc: Krzysztof Kozlowski <krzk@...nel.org>
> Cc: Pawel Osciak <pawel@...iak.com>
> Cc: Marek Szyprowski <m.szyprowski@...sung.com>
> Cc: Tomasz Figa <tfiga@...omium.org>
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Cc: Oded Gabbay <oded.gabbay@...il.com>
> Cc: Omer Shpigelman <oshpigelman@...ana.ai>
> Cc: Tomer Tayar <ttayar@...ana.ai>
> Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> Cc: Pawel Piskorski <ppiskorski@...ana.ai>
> Cc: linux-arm-kernel@...ts.infradead.org
> Cc: linux-samsung-soc@...r.kernel.org
> Cc: linux-media@...r.kernel.org
> Cc: linux-mm@...ck.org
> ---
>  drivers/gpu/drm/exynos/exynos_drm_g2d.c           | 3 +--
>  drivers/media/common/videobuf2/videobuf2-memops.c | 3 +--
>  drivers/misc/habanalabs/common/memory.c           | 3 +--
>  include/linux/mm.h                                | 2 +-
>  mm/frame_vector.c                                 | 4 ++--
>  5 files changed, 6 insertions(+), 9 deletions(-)
>
> diff --git a/drivers/gpu/drm/exynos/exynos_drm_g2d.c b/drivers/gpu/drm/exynos/exynos_drm_g2d.c
> index 967a5cdc120e..ac452842bab3 100644
> --- a/drivers/gpu/drm/exynos/exynos_drm_g2d.c
> +++ b/drivers/gpu/drm/exynos/exynos_drm_g2d.c
> @@ -480,8 +480,7 @@ static dma_addr_t *g2d_userptr_get_dma_addr(struct g2d_data *g2d,
>                 goto err_free;
>         }
>
> -       ret = get_vaddr_frames(start, npages, FOLL_FORCE | FOLL_WRITE,
> -               g2d_userptr->vec);
> +       ret = get_vaddr_frames(start, npages, g2d_userptr->vec);
>         if (ret != npages) {
>                 DRM_DEV_ERROR(g2d->dev,
>                               "failed to get user pages from userptr.\n");
> diff --git a/drivers/media/common/videobuf2/videobuf2-memops.c b/drivers/media/common/videobuf2/videobuf2-memops.c
> index 6e9e05153f4e..9dd6c27162f4 100644
> --- a/drivers/media/common/videobuf2/videobuf2-memops.c
> +++ b/drivers/media/common/videobuf2/videobuf2-memops.c
> @@ -40,7 +40,6 @@ struct frame_vector *vb2_create_framevec(unsigned long start,
>         unsigned long first, last;
>         unsigned long nr;
>         struct frame_vector *vec;
> -       unsigned int flags = FOLL_FORCE | FOLL_WRITE;
>
>         first = start >> PAGE_SHIFT;
>         last = (start + length - 1) >> PAGE_SHIFT;
> @@ -48,7 +47,7 @@ struct frame_vector *vb2_create_framevec(unsigned long start,
>         vec = frame_vector_create(nr);
>         if (!vec)
>                 return ERR_PTR(-ENOMEM);
> -       ret = get_vaddr_frames(start & PAGE_MASK, nr, flags, vec);
> +       ret = get_vaddr_frames(start & PAGE_MASK, nr, vec);
>         if (ret < 0)
>                 goto out_destroy;
>         /* We accept only complete set of PFNs */

For drivers/media/common/videobuf2/:

Acked-by: Tomasz Figa <tfiga@...omium.org>

Best regards,
Tomasz