On Wednesday, November 12, 2014 11:28:15 AM Daniel Vetter wrote: > On Tue, Nov 11, 2014 at 11:13:28AM -0800, Kenneth Graunke wrote: > > On Tuesday, November 11, 2014 06:59:51 PM Neil Roberts wrote: > > > Kenneth Graunke <kenn...@whitecape.org> writes: > > > > > > > drm-intel-next must have the new software checker turned on, which > > > > disallows non-whitelisted register writes (along with libva, so it > > > > can't really be enabled upstream yet). > > > > > > For what it's worth, I get the EINVAL error even on the stock Fedora 20 > > > kernel on Haswell (and presumably IvyBridge) so I can only assume the > > > software checker is already upstream, unless I'm misunderstanding > > > something. > > > > > > $ uname -r > > > 3.16.7-200.fc20.x86_64 > > > $ modinfo i915 | grep cmd_parser > > > parm: enable_cmd_parser:Enable command parsing [...] > > > (1=enabled [default], 0=disabled) (int) > > > $ sudo cat /sys/module/i915/parameters/enable_cmd_parser > > > 1 > > > > > > If I cat 0 to /sys/module/i915/parameters/enable_cmd_parser then I no > > > longer get the EINVAL error. > > > > > > - Neil > > > > Huh. Yeah, I thought they turned it on by default in 3.16, which I don't > > understand at all. AFAIK the libva issue isn't fixed (or wasn't by then), so > > it sure seems like it would've broken userspace. Which would be a pretty > > clear kernel policy violation... > > We let libva pass. And in the latest patches from Brad if we detect libva > tricks we'll still let it pass, just not with elevated privs needed for > writing special registers. And the point of enabling the parser in 3.16 > already was to have as much coverage early as possible to catch any > userspace issues we've missed. > -Daniel
Cool. I'd seen the discussiosn on making it work, and thought it hadn't actually happened...but I had my facts wrong. Sorry for the trouble. I actually haven't heard anyone complaining about breakage, so apparently it works pretty well. Nice! --Ken
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