Subject: Re: [PATCH vhost v2 19/19] virtio_net: sq support premapped mode

From: "Michael S. Tsirkin" <[email-masked]>
Date: Mon, 26 Feb 2024 07:12:01 -0500

On Mon, Feb 26, 2024 at 08:06:23PM +0800, Xuan Zhuo wrote:
> On Mon, 26 Feb 2024 06:57:17 -0500, "Michael S. Tsirkin" <[email-masked]> wrote:
> > On Mon, Feb 26, 2024 at 07:39:09PM +0800, Xuan Zhuo wrote:
> > > On Mon, 26 Feb 2024 06:36:53 -0500, "Michael S. Tsirkin" <[email-masked]> wrote:
> > > > On Mon, Feb 26, 2024 at 07:33:29PM +0800, Xuan Zhuo wrote:
> > > > > > what is dma_map_direct? can't find it in the tree.
> > > > >
> > > > > YES.
> > > > >
> > > > >
> > > > > diff --git a/kernel/dma/mapping.c b/kernel/dma/mapping.c
> > > > > index 58db8fd70471..5a8f7a927aa1 100644
> > > > > --- a/kernel/dma/mapping.c
> > > > > +++ b/kernel/dma/mapping.c
> > > > > @@ -144,6 +144,18 @@ static inline bool dma_map_direct(struct device *dev,
> > > > >         return dma_go_direct(dev, *dev->dma_mask, ops);
> > > > >  }
> > > > >
> > > > > +bool dma_is_direct(struct device *dev)
> > > > > +{
> > > > > +       if (!dma_map_direct(dev, ops))
> > > > > +               return false;
> > > > > +
> > > > > +       if (is_swiotlb_force_bounce(dev))
> > > > > +               return false;
> > > > > +
> > > > > +       return true;
> > > > > +}
> > > > > +EXPORT_SYMBOL(dma_unmap_page_attrs);
> > > > > +
> > > > >
> > > > > Thanks.
> > > >
> > > >
> > > > where is it? linux-next?
> > >
> > >
> > > I see it in the vhost branch kernel/dma/mapping.c.
> > >
> > > Maybe you miss it.
> > >
> > > Thanks.
> > >
> >
> > which hash?
> 
> fd0b29af02bb75acc94eb08c06e2c10cbce2ea67

Thanks. Now I see it donnu what was wrong with me.

> > > > --
> > > > MST