[Intel-gfx] [PATCH v2 3/3] drm/i915: Track OACONTROL register enable/disable during parsing

[Zhenyu Wang]

On 2014.03.28 10:21:50 -0700, bradley.d.volkin at intel.com wrote:
> From: Brad Volkin <bradley.d.volkin at intel.com>
> 
> There is some thought that the data from the performance counters enabled
> via OACONTROL should only be available to the process that enabled counting.
> To limit snooping, require that any batch buffer which sets OACONTROL to a
> non-zero value also sets it back to 0 before the end of the batch.
> 

I think this might be too strict although there's good point in this.
But it makes almost impossible to insert mi report count command to probe
GPU statistics from kind of third-party tool or lib.

Could we have a i915.enable_cmd_parser config that can disable this?

-- 
Open Source Technology Center, Intel ltd.

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