[Intel-gfx] [PATCH] drm/i915: Add OACONTROL to the command parser register whitelist.
Kenneth Graunke
kenneth at whitecape.org
Fri Mar 28 00:22:44 CET 2014
On 03/27/2014 03:44 PM, Daniel Vetter wrote:
> On Thu, Mar 27, 2014 at 10:34 PM, Kenneth Graunke <kenneth at whitecape.org> wrote:
>> Why are we parsing batches with I915_EXEC_SECURE at all? Secure batches
>> are only issued from trusted code which is guaranteed to be running as
>> root. I don't see any benefit to scanning those batches, and there's
>> definitely overhead.
>>
>> I mean, sure, it may be reasonable in the short term as a way to test
>> the command parser, but I certainly hope we don't *ship* that.
>
> Everyone runs X as root, but I kinda want X to also be able to run as
> non-root. The cmd parser has a special list of drm master register
> lists which should allow this, but if we just bypass the cmd parser
> for all normal X installs we'll have 0 test coverage on this. Which
> means broken like hell.
>
> Hence I actually intend to ship this, yes. Chris doesn't like it either really.
> -Daniel
Seriously? Hurt performance on every user's system just so you can test
things? That a classic case of the tail wagging the dog.
Why not make a i915.enable_cmd_parser=2 value which enables it all the
time and use that when running igt? Clearly being able to test this is
valuable, but enabling it universally is *not* OK.
-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 836 bytes
Desc: OpenPGP digital signature
URL: <http://lists.freedesktop.org/archives/intel-gfx/attachments/20140327/37e22a92/attachment.sig>
More information about the Intel-gfx
mailing list