static void trbe_handle_spurious(struct perf_output_handle *handle)
{
- struct trbe_buf *buf = etm_perf_sink_config(handle);
+ u64 limitr = read_sysreg_s(SYS_TRBLIMITR_EL1);
- buf->trbe_limit = compute_trbe_buffer_limit(handle);
- buf->trbe_write = buf->trbe_base + PERF_IDX2OFF(handle->head, buf);
- if (buf->trbe_limit == buf->trbe_base) {
- trbe_drain_and_disable_local();
- /*
- * Just communicate trace truncation event to the user space by
- * marking it with PERF_AUX_FLAG_TRUNCATED.
- */
- perf_aux_output_flag(handle, PERF_AUX_FLAG_TRUNCATED);
- return;
- }
- trbe_enable_hw(buf);
+ /*
+ * If the IRQ was spurious, simply re-enable the TRBE
+ * back without modifying the buffer parameters to
+ * retain the trace collected so far.
+ */
+ limitr |= TRBLIMITR_ENABLE;
+ write_sysreg_s(limitr, SYS_TRBLIMITR_EL1);
+ isb();
}
static void trbe_handle_overflow(struct perf_output_handle *handle)