From: Ben Skeggs <skeggsb@gmail.com>
To: Dave Airlie <airlied@redhat.com>
Cc: dri-devel@lists.freedesktop.org
Subject: Re: GEM - radeon cs ioctl deadlock
Date: Thu, 14 Oct 2010 11:47:19 +1000 [thread overview]
Message-ID: <1287020839.812.2.camel@nisroch> (raw)
In-Reply-To: <1287008098.4928.9.camel@clockmaker-el6>
On Thu, 2010-10-14 at 08:14 +1000, Dave Airlie wrote:
> On Wed, 2010-10-13 at 17:57 -0400, Jerome Glisse wrote:
> > So we are facing a deadlock with the radeon cs ioctl. When a buffer is given
> > a name (with flink) we could endup with 2 handle pointing to the same
> > object (flink object and open it from same file descriptor). Would it be ok
> > if i change gem open to first look if we already have an handle for the
> > object and to use that handle instead of creating a new one ? Or could
> > this break intel driver ?
>
> I think r300g worked around this already, maybe we should just avoid
> doing it from userspace if possible.
We had this in nouveau at some point. In the end, I prevented the
deadlock from occuring by checking that a process doesn't reserve the
same buffer twice (we store file_priv in a reserved_by field in the bo
as we reserve the buffers), and then just fixed userspace.
Ben.
>
> Dave.
>
>
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> dri-devel mailing list
> dri-devel@lists.freedesktop.org
> http://lists.freedesktop.org/mailman/listinfo/dri-devel
next prev parent reply other threads:[~2010-10-14 1:47 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-10-13 21:57 GEM - radeon cs ioctl deadlock Jerome Glisse
2010-10-13 22:14 ` Dave Airlie
2010-10-14 1:47 ` Ben Skeggs [this message]
2010-10-18 15:16 ` Thomas Hellstrom
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