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This call allows for checking if the given execution buffer has been completed and complements the completion signal. Initially the GPU multiplexer always sent such a signal when the currently scheduled execution buffer has been completed. During enablement of the 'iris' driver it became necessary to properly check of sequence number. In case of the Intel GPU multiplexer the sequence numbers are continous, which prompted the greater-than-or-equal check in the DRM back end. By hidding this implementation detail behind the interface, GPU drivers are free to deal with sequence numbers any way they like and allows for polling in the client, where the completion signal is now more of a progress signal. Issue #4265. |
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This source-code repository contains genuine low-level OS components and interfaces of Genode. It solely depends on the framework's base API.