freedreno: Avoid flushing deferred submits for u_trace
This is a bit ugly, but with userspace fences and deferred submits it is better to poll until the timestamp buffer is ready. Otherwise we could be triggering deferred submits to flush sooner than they normally would, changing the behavior of what we are trying to measure. Signed-off-by: Rob Clark <robdclark@chromium.org> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/10444>
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@ -477,6 +477,11 @@ fd_trace_read_ts(struct u_trace_context *utctx,
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/* Only need to stall on results for the first entry: */
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if (idx == 0) {
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/* Avoid triggering deferred submits from flushing, since that
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* changes the behavior of what we are trying to measure:
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*/
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while (fd_bo_cpu_prep(ts_bo, ctx->pipe, FD_BO_PREP_NOSYNC))
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usleep(10000);
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int ret = fd_bo_cpu_prep(ts_bo, ctx->pipe, FD_BO_PREP_READ);
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if (ret)
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return U_TRACE_NO_TIMESTAMP;
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