Re: [Intel-gfx] [PULL] topic/gvt-ww-lock

[Maarten Lankhorst <maarten.lankhorst@linux.intel.com>]

Hey,

Op 22-09-2020 om 13:51 schreef Wang, Zhi A:
>
> Hi,
>
> Here's the patch which introduces GVT-g ww lock support against drm-intel-gt-next branch.
>
> Thanks
>
> -- 
>
> The following changes since commit 4316b19dee27cc5cd34a95fdbc0a3a5237507701:
>
>   drm/i915: Fix uninitialised variable in intel_context_create_request. (2020-09-21 11:09:46 +0200)
>
> are available in the git repository at:
>
>   https://github.com/intel/gvt-linux.git tags/gvt-ww-lock-09-22-2020
>
> for you to fetch changes up to e1b49ae155451aaa039eeb23fce808c71a038283:
>
>   drm/i915/gvt: Introduce per object locking in GVT scheduler. (2020-09-22 12:09:56 +0300)
>
> ----------------------------------------------------------------
> gvt-ww-lock-09-22-2020:
>
> - Introduce ww lock support into GVT-g.
>
> ----------------------------------------------------------------
> Zhi Wang (1):
>       drm/i915/gvt: Introduce per object locking in GVT scheduler.
>
>  drivers/gpu/drm/i915/gvt/scheduler.c | 68 ++++++++++++++++++++++++++++++------
>  1 file changed, 57 insertions(+), 11 deletions(-) 

I've taken a look at this branch, and I have some feedback.

Adding ww_ctx blindly like is done doesn't work. For example I'm working on a patch that adds ww handling to
i915_gem_object_ggtt_pin(), so you don't have to perform manually in prepare_shadow_wa_ctx(). intel_context_pin() already has a ww dance, you can keep calling it without open coding it. If you do decide to call it manually, intel_context_put would have to be called after ctx_fini. Cheers, Maarten

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