Re: [RFC] xf86-video-intel: enable hw-generated binding tables

[Abdiel Janulgue <abdiel.janulgue@linux.intel.com>]

On Thursday, April 24, 2014 07:06:34 AM Chris Wilson wrote:
> On Thu, Apr 24, 2014 at 09:08:14AM +0300, Abdiel Janulgue wrote:
> > Anyway I haven't tried the work-around where we explictly only disable the
> > BT and RS on the other user-space clients (xorg driver in this case) when
> > Mesa is using RS instead of forcing the reset of the clients to use RS
> > format.  I'll try that first and let you know if it works. 

I hate to break the bad news. Tried this just now - still get hangs :(

So I guess, all userspace clients* does need to use RS-format if we use this 
feature. GPGPU workloads seems to be special use-case where the RS hwbinding 
table format can be disabled. Otherwise, I guess we are stuck with this 
inflexibility.

[1]
On the other hand, it doesn't seem all that bad though. The RS hw-binding 
table format are only needed for clients that submit vertex and pixel shader 
commands. I've identified currently just UXA and SNA that seem to use this 
besides Mesa. OpenCL is not affected.


> > If it does, it
> > might be more efficient to do that in the kernel?
> 
> It has to be done in the kernel in order for interoperability with third
> party clients.
> -Chris