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11dce2ac81
The last V3D_CLE_READAHEAD bytes of the CLE buffer are unusable because
using them would prefetch the next readahead bytes of the CL that would
be outside the allocated BO. To guarantee that we can chain a BO to the
current CL we always reserve space for the BRANCH packet.
Not taking this into account has been generating kernel dmesg errors like
"MMU error from client CLE".
As V3D_CLE_READAHEAD is different from RPi4 (256 bytes) to RPi5 (1024 bytes).
So we needed to rename v3d_cl.c to v3dX_cl.c to have different objects per
V3D_VERSION.
Extra assertions have been included to validate that we don't write
packets over the usable size of the CL silently.
v2: - Remove spurious blank line (Iago Toral)
- Do not declare unusable the space needed for the BRANCH packet,
and take it into account for all reservations.
v3: - Handle BRANCH packet reserve only when CLE BO allocation is done.
v4: - Assert on BO size updates that we are within the BO size.
(Iago Toral)
Reviewed-by: Iago Toral Quiroga <itoral@igalia.com>
cc: mesa-stable
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/29023>
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