[Mesa-dev] amd/common: derive register headers and ac_debug from a JSON database

[Nicolai Hähnle]

Hi all,

this series moves to a description of registers in a JSON file as the 
single source of truth for register descriptions. Both register headers 
and the tables used for decoding command buffers for debugging are 
derived from this JSON description at build time.

This should make ac_debug less fragile down the line, and allows us to 
be more explicit about which chips have which registers / fields / enum 
values.

The JSON description also has a notion of address spaces. This is 
already used to distinguish packet3 payloads from registers, and could 
be used in the future to distinguish more cleanly between registers and 
resource descriptor fields as well.

Since some of the patches are too large for the mailing list, the series 
is here as a merge request: 
https://gitlab.freedesktop.org/mesa/mesa/merge_requests/880

Please review!

Thanks,
Nicolai
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