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v3dv/debug: add debug option to disable TFU codepaths

Alejandro Piñeiro requested to merge apinheiro/mesa:wip/apinheiro/v3dv-debug-disable-tfu into main

This can have two main uses:

  • If we suspect a problem with TFU copies, we can disable it and check if other codepaths gets a test/app working.
  • To test other codepaths, as in general, TFU is the preferred option for copies.

Note that for now this is only for v3dv, as for v3d, mipmap generation uses TFU without an alternative codepath.

With this option we also adds an assert if we try to submit a TFU job, just in case we keep adding other methods that use TFU, and forget to include the debug option there.

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