[Intel-gfx] [v1 03/10] drm/i915: context submission pvmmio optimization

[Zhang, Xiaolin]

On 10/11/2018 05:12 PM, Chris Wilson wrote:
> Quoting Xiaolin Zhang (2018-10-11 07:14:05)
>> It is performance optimization to reduce mmio trap numbers from 4 to
>> 1 durning ELSP porting writing (context submission).
>>
>> When context subission, to cache elsp_data[4] values in
>> the shared page, the last elsp_data[0] port writing will be trapped
>> to gvt for real context submission.
>>
>> Use PVMMIO_ELSP_SUBMIT to control this level of pvmmio optimization.
>>
>> v1: rebase
>> v0: RFC
>>
>> Signed-off-by: Xiaolin Zhang <xiaolin.zhang at intel.com>
>> ---
>>  drivers/gpu/drm/i915/i915_vgpu.c |  2 ++
>>  drivers/gpu/drm/i915/intel_lrc.c | 37 ++++++++++++++++++++++++++++++++++++-
> Hint: intel_vgpu_submission.c and go wild. You do not need to emulate
> execlists at all, an async interface along the lines of guc would
> strangely enough be more akin to what you want.
> -Chris
>
can't understand your comment very well. so far, vgpu only support
execlist workload submission only, this pv optimization is only valid
for execlist submission and can't support guc.

BRs, Xiaolin