linux-kernel - Re: [PATCH v5 2/9] scatterlist: Add a flag for the restricted memory

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Date: Mon, 20 May 2024 09:53:53 +0000
From: Yong Wu (吴勇) <Yong.Wu@...iatek.com>
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Subject: Re: [PATCH v5 2/9] scatterlist: Add a flag for the restricted memory

On Thu, 2024-05-16 at 11:59 +0200, AngeloGioacchino Del Regno wrote:
> Il 15/05/24 13:23, Yong Wu ha scritto:
> > Introduce a FLAG for the restricted memory which means the memory
> > is
> > protected by TEE or hypervisor, then it's inaccessiable for kernel.
> > 
> > Currently we don't use sg_dma_unmark_restricted, thus this
> > interface
> > has not been added.
> > 
> > Signed-off-by: Yong Wu <yong.wu@...iatek.com>
> > ---
> >   include/linux/scatterlist.h | 34
> > ++++++++++++++++++++++++++++++++++
> >   1 file changed, 34 insertions(+)
> > 
> > diff --git a/include/linux/scatterlist.h
> > b/include/linux/scatterlist.h
> > index 77df3d7b18a6..a6ad9018eca0 100644
> > --- a/include/linux/scatterlist.h
> > +++ b/include/linux/scatterlist.h
> > @@ -282,6 +282,7 @@ static inline void sg_unmark_end(struct
> > scatterlist *sg)
> >   
> >   #define SG_DMA_BUS_ADDRESS	(1 << 0)
> >   #define SG_DMA_SWIOTLB		(1 << 1)
> > +#define SG_DMA_RESTRICTED	(2 << 1)
> 
> I think you wanted to write (1 << 2) here :-)

Apparently, you are right:)

Thanks.

> 
> Cheers,
> Angelo