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9b131eb86e
Buffer-to-buffer copies on V3D 7.1+ can be served by the TFU as a
raster-to-raster copy, avoiding the per-copy CL render job and
tile_alloc/TSDA BO overhead of the TLB-based path.
Treat the buffer as a raster texture and chunk the copy into TFU
jobs of up to 16384x16384 pixels. Pick the largest pixel size
(cpp in {4,2,1}) such that src/dst offsets and size are all
cpp-aligned: cpp=4 (R8G8B8A8_UINT) is the expected common case;
cpp=2 (R8G8_UINT) and cpp=1 (R8_UINT) handle Vulkan-permitted
unaligned vkCmdCopyBuffer regions that would otherwise fall back
to the slow TLB path. Skipped when V3D_DEBUG=disable_tfu is set;
emits perf_debug when the cpp=1/2 fallback is taken.
Drop the `if (copy_job)` guard on src_bo cleanup registration in
v3dv_CmdUpdateBuffer: the TFU path queues jobs without returning a
v3dv_job*, so the staging BO must be tracked unconditionally to
avoid leaking once the cmd buffer is submitted.
Assisted-by: Claude Opus 4.7
Reviewed-by: Iago Toral Quiroga <itoral@igalia.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/41725>
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