linux-kernel - Re: [PATCH v2 24/25] drm/mediatek: respect page offset for PRIME mmap calls

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Date:   Tue, 28 May 2019 13:35:59 +0800
From:   CK Hu <ck.hu@...iatek.com>
To:     <yongqiang.niu@...iatek.com>
CC:     <p.zabel@...gutronix.de>, <robh+dt@...nel.org>,
        <matthias.bgg@...il.com>, <airlied@...ux.ie>,
        <mark.rutland@....com>, <dri-devel@...ts.freedesktop.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>, <Bibby.Hsieh@...iatek.com>,
        <yt.shen@...iatek.com>
Subject: Re: [PATCH v2 24/25] drm/mediatek: respect page offset for PRIME
 mmap calls

Hi, Yongqiang:

On Tue, 2019-04-16 at 16:33 +0800, CK Hu wrote:
> Hi, Yongqiang:
> 
> On Wed, 2019-03-27 at 14:19 +0800, yongqiang.niu@...iatek.com wrote:
> > From: Yongqiang Niu <yongqiang.niu@...iatek.com>
> > 
> > Respect page offset for PRIME mmap calls
> 
> Reviewed-by: CK Hu <ck.hu@...iatek.com>


This patch looks independent, so I've applied it to
mediatek-drm-fixes-5.2 [1], thanks.

[1]
https://github.com/ckhu-mediatek/linux.git-tags/commits/mediatek-drm-fixes-5.2

Regards,
CK

> 
> > 
> > Signed-off-by: Yongqiang Niu <yongqiang.niu@...iatek.com>
> > ---
> >  drivers/gpu/drm/mediatek/mtk_drm_gem.c | 7 ++++++-
> >  1 file changed, 6 insertions(+), 1 deletion(-)
> > 
> > diff --git a/drivers/gpu/drm/mediatek/mtk_drm_gem.c b/drivers/gpu/drm/mediatek/mtk_drm_gem.c
> > index c230237..524e494 100644
> > --- a/drivers/gpu/drm/mediatek/mtk_drm_gem.c
> > +++ b/drivers/gpu/drm/mediatek/mtk_drm_gem.c
> > @@ -144,7 +144,6 @@ static int mtk_drm_gem_object_mmap(struct drm_gem_object *obj,
> >  	 * VM_PFNMAP flag that was set by drm_gem_mmap_obj()/drm_gem_mmap().
> >  	 */
> >  	vma->vm_flags &= ~VM_PFNMAP;
> > -	vma->vm_pgoff = 0;
> >  
> >  	ret = dma_mmap_attrs(priv->dma_dev, vma, mtk_gem->cookie,
> >  			     mtk_gem->dma_addr, obj->size, mtk_gem->dma_attrs);
> > @@ -183,6 +182,12 @@ int mtk_drm_gem_mmap(struct file *filp, struct vm_area_struct *vma)
> >  
> >  	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);
> >  }
> >  
>