gpu: nova-core: gsp: fix improper handling of empty slot in cmdq

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The current code hands out buffers that go all the way up to and
including `rx - 1`, but we need to maintain an empty slot to prevent the
ring buffer from wrapping around into having 'tx == rx', which means
empty.

Also add more rigorous no-panic proofs.

Fixes: 75f6b1de81 ("gpu: nova-core: gsp: Add GSP command queue bindings and handling")
Signed-off-by: Eliot Courtney <ecourtney@nvidia.com>
Reviewed-by: Gary Guo <gary@garyguo.net>
Link: https://patch.msgid.link/20260129-nova-core-cmdq1-v3-4-2ede85493a27@nvidia.com
Signed-off-by: Alexandre Courbot <acourbot@nvidia.com>

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Eliot Courtney 2026-01-29 16:45:02 +09:00 • committed by Alexandre Courbot

parent f6f072d8ef

commit f64caf673c

1 changed files with 20 additions and 14 deletions

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drivers/gpu/nova-core/gsp/cmdq.rs

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