Quoting Lionel Landwerlin (2018-06-01 10:52:15)
> + /*
> + * The LRCA is aligned to a page. As a result the
> + * lower 12bits are always at 0 and reused in the
> + * context descriptor for some flags. They won't be
> + * part of the context ID in the OA reports, so squash
> + * those lower bits.
> + */
> + i915->perf.oa.specific_ctx_id =
> + (lrca + LRC_HEADER_PAGES * PAGE_SIZE) >> 12;
Hmm. I think what you want is lower_32_bits(ce->lrc_desc) as that is
what is being copied across.
> +
> + /*
> + * GuC uses the top bit to signal proxy submission, so
> + * ignore that bit if using GuC.
> + */
> + i915->perf.oa.specific_ctx_id_mask =
> + (1U << (GEN8_CTX_ID_WIDTH - 1)) - 1;
> + } else {
> + i915->perf.oa.specific_ctx_id = stream->ctx->hw_id;
Imagine a ce->hw_id :)
Or for the time being ce->gem_context->hw_id;
I think I'm arguing for returning intel_context from oa_get_render_lrca()
and not lrca, and deriving all the different ctx_id from the pinned ce.
-Chris
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