[Intel-gfx] [PATCH 3/3] drm/i915/perf: enable OAR context save/restore of performance counters

[Chris Wilson]

Quoting Umesh Nerlige Ramappa (2019-10-14 19:55:31)
> @@ -2313,6 +2377,17 @@ static int lrc_configure_all_contexts(struct i915_perf_stream *stream,
>                         return err;
>                 }
>  
> +               /*
> +                * For Gen12, performance counters are context
> +                * saved/restored. Only enable it for the context that
> +                * requested this.
> +                */
> +               if (ctx == stream->ctx && IS_GEN(i915, 12)) {
> +                       err = gen12_configure_context_oar(ctx, oa_config != NULL);


regs[CTX_CONTEXT_CONTROL] |= intel_lrc_make_ctx_control(engine);

can be modified with a plain LRI (at least I have successfully modified
INHIBIT_SYN_CTX before). Have you tried just emitting an LRI in the pinned
context?
-Chris
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