From: Christoph Hellwig <hch@infradead.org>
To: Daniel Vetter <daniel@ffwll.ch>
Cc: Christoph Hellwig <hch@infradead.org>,
Oleksandr Andrushchenko <andr2000@gmail.com>,
Juergen Gross <jgross@suse.com>,
Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
dri-devel <dri-devel@lists.freedesktop.org>,
Daniel Vetter <daniel.vetter@intel.com>,
xen-devel@lists.xenproject.org, boris.ostrovsky@oracle.com
Subject: Re: [PATCH] drm/xen-front: Make shmem backed display buffer coherent
Date: Thu, 20 Dec 2018 10:33:11 -0800 [thread overview]
Message-ID: <20181220183311.GA30801@infradead.org> (raw)
In-Reply-To: <CAKMK7uF8hmO=z4jy+1b1z5ELLWpjcZpqmLoRiP2BJvwnNpOFeg@mail.gmail.com>
On Thu, Dec 20, 2018 at 07:29:37PM +0100, Daniel Vetter wrote:
> What we most definitely not want to end up with though is actually
> streaming dma, because with that all the zero copy buffer sharing
> tricks become pointless. There's pretty epic amounts of hacks to work
> around this, I have no idea what's supposed to give here.
Err, with streaming DMA buffer sharing is trivial. The coherent DMA
allocator is what causes all kinds of horrible hacks that can't actually
work on various platforms.
next prev parent reply other threads:[~2018-12-20 18:33 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
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 [this message]
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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