[Intel-gfx] [RFC 00/22] Gen7 batch buffer command parser

[Volkin, Bradley D]

On Wed, Feb 05, 2014 at 02:28:29AM -0800, Chris Wilson wrote:
> On Tue, Nov 26, 2013 at 08:51:17AM -0800, bradley.d.volkin at intel.com wrote:
> > From: Brad Volkin <bradley.d.volkin at intel.com>
> > 
> > Certain OpenGL features (e.g. transform feedback, performance monitoring)
> > require userspace code to submit batches containing commands such as
> > MI_LOAD_REGISTER_IMM to access various registers. Unfortunately, some
> > generations of the hardware will noop these commands in "unsecure" batches
> > (which includes all userspace batches submitted via i915) even though the
> > commands may be safe and represent the intended programming model of the device.
> > 
> > This series introduces a software command parser similar in operation to the
> > command parsing done in hardware for unsecure batches. However, the software
> > parser allows some operations that would be noop'd by hardware, if the parser
> > determines the operation is safe, and submits the batch as "secure" to prevent
> > hardware parsing. Currently the series implements this on IVB and HSW.
> 
> Just one more question... Do you have a branch for people to test?

Not at the moment. And as mentioned in the v2 cover letter, it's actually not
particularly testable (or mergeable for that matter) right now because of a
regression in secure dispatch on nightly.

> -Chris
> 
> -- 
> Chris Wilson, Intel Open Source Technology Centre