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provide interface to query loaded firmware and topology to userspace via debugfs #3867

@kv2019i

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@kv2019i

As the logic has got more complicated to select the SOF firmware and topology filenames to load, it is getting more and more difficult to write robust test-cases that need to match test-content with the topology and firmware loaded.

To make test case development easier and more robust, the kernel should expose the firmware and topologies that have been loaded via debugfs or sysfs.

Example discussion in sof-test: thesofproject/sof-test#956 (comment)

@marc-hb EDIT: this "example" discussion is actually a MUST READ FIRST. It's about deciding what logging solution to use based on the firmware type.

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