Jonathan
8f159a8576
This fixes TC's buffer invalidation code for buffers that are shared
between contexts.
TC is unable to notify other TCs in case it replaces a shared buffer's
underlying storage when invalidating, causing those other TCs to use
wrong buffer IDs for busyness tracking, which leads to corruption due
to invalidation fast-paths being triggered when they shouldn't be.
This patch addresses this issue by tracking if a buffer is shared, and
if it is, disabling buffer storage replacement for the affected buffer.
This is achieved by tracking which TC instance first accessed a certain
buffer. If a second instance then accesses it as well, it will realize
that it isn't the only one working on the buffer and mark the buffer
accordingly.
If TC needs to invalidate a buffer for the correctness of an operation
at any point, it will fall back to doing the operation in a synchronous
fashion with this patch if the buffer is shared and currently busy.
It might be possible to later detect that a buffer has become un-shared;
however, this is outside of the scope of this bugfix patch.
v2: Do not disable buffer busyness tracking for shared buffers.
Fixes: e9c41b32 ("gallium/u_threaded: add buffer lists - tracking of buffers referenced by tc")
Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/17338>
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