On 01/10/2018 20:39, Chris Wilson wrote:
Quoting Tvrtko Ursulin (2018-10-01 17:41:00)
On 01/10/2018 17:24, Chris Wilson wrote:
Quoting Tvrtko Ursulin (2018-10-01 17:15:24)
+ len = sizeof(struct drm_i915_query_engine_info) +
+ I915_NUM_ENGINES * sizeof(struct drm_i915_engine_info);
Since I915_NUM_ENGINES is not ABI, and this will be using a 2-step
query (1st to find length, 2nd to grab details), it should work with
info->num_rings. If not, we have problems later ;)
I don't follow, what do you plan to enumerate that would cause a problem?
All I'm suggesting is to avoid any notion that this length is fixed
indefinitely :)
You mean extra paranoid step of making sure reported len exactly matches
the number of reported engines * sizeof(engine_info)? uAPI is defined to
query required memory block size and then read the reported num_engines
so I think that's fine, but sure, I can make it match exactly.
Regards,
Tvrtko
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