From: Christoph Hellwig <hch@infradead.org>
To: Gerd Hoffmann <kraxel@redhat.com>
Cc: "Oleksandr Andrushchenko" <andr2000@gmail.com>,
"Noralf Trønnes" <noralf@tronnes.org>,
xen-devel@lists.xenproject.org, linux-kernel@vger.kernel.org,
dri-devel@lists.freedesktop.org, daniel.vetter@intel.com,
jgross@suse.com, boris.ostrovsky@oracle.com,
"Oleksandr Andrushchenko" <oleksandr_andrushchenko@epam.com>
Subject: Re: [PATCH] drm/xen-front: Make shmem backed display buffer coherent
Date: Thu, 20 Dec 2018 07:37:19 -0800 [thread overview]
Message-ID: <20181220153719.GB22997@infradead.org> (raw)
In-Reply-To: <20181219131452.cehks3kabcwuuk7i@sirius.home.kraxel.org>
On Wed, Dec 19, 2018 at 02:14:52PM +0100, Gerd Hoffmann wrote:
>
> > > > + if (!dma_map_sg(dev->dev, xen_obj->sgt->sgl, xen_obj->sgt->nents,
> > > > + DMA_BIDIRECTIONAL)) {
> > >
> > >
> > > Are you using the DMA streaming API as a way to flush the caches?
> > Yes
> > > Does this mean that GFP_USER isn't making the buffer coherent?
> >
> > No, it didn't help. I had a question [1] if there are any other better way
> > to achieve the same, but didn't have any response yet. So, I implemented
> > it via DMA API which helped.
>
> set_pages_array_*() ?
>
> See arch/x86/include/asm/set_memory.h
That sounds even more bogus, don't go there.
next prev parent reply other threads:[~2018-12-20 15:37 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-11-27 10:32 [PATCH] drm/xen-front: Make shmem backed display buffer coherent Oleksandr Andrushchenko
2018-12-13 10:17 ` Oleksandr Andrushchenko
2018-12-13 15:48 ` Daniel Vetter
2018-12-14 7:09 ` Oleksandr Andrushchenko
2018-12-14 8:35 ` Daniel Vetter
2018-12-17 8:03 ` Oleksandr Andrushchenko
2018-12-18 19:20 ` Noralf Trønnes
2018-12-19 8:18 ` Oleksandr Andrushchenko
2018-12-19 13:14 ` Gerd Hoffmann
2018-12-19 13:21 ` Oleksandr Andrushchenko
2018-12-19 14:10 ` Gerd Hoffmann
2018-12-20 11:19 ` Oleksandr Andrushchenko
2018-12-20 15:37 ` Christoph Hellwig [this message]
2018-12-19 16:14 ` Noralf Trønnes
2018-12-20 11:24 ` Oleksandr Andrushchenko
2018-12-20 15:36 ` Christoph Hellwig
2018-12-20 15:49 ` Oleksandr Andrushchenko
2018-12-20 17:39 ` Christoph Hellwig
2018-12-20 18:29 ` Daniel Vetter
2018-12-20 18:33 ` Christoph Hellwig
2018-12-20 18:35 ` Daniel Vetter
2018-12-20 18:38 ` Christoph Hellwig
2018-12-21 9:16 ` Oleksandr Andrushchenko
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