80  * We adjust a single wrap-around but fail if the distance is bigger than that.
90 	/* Correct a single wrap-around.  If we lost enough MTCs to wrap  in pt_time_ctc_delta()
96 		/* Since we only store the CTC between TMA/MTC or MTC/TMC a  in pt_time_ctc_delta()
146 	/* We got the full time; we recover from previous losses. */  in pt_time_update_tsc()
188 	/* We shouldn't have more than one TMA per TSC. */  in pt_time_update_tma()
192 	/* We're ignoring MTC between TSC and TMA. */  in pt_time_update_tma()
212 	 * value, we can use the TMA as an MTC.  in pt_time_update_tma()
214 	 * If it isn't, we will estimate the preceding MTC based on the CTC bits  in pt_time_update_tma()
215 	 * the TMA provides at the next MTC.  We forget about the previous MTC  in pt_time_update_tma()
218 	 * If no MTC packets are dropped around TMA, we will estimate the  in pt_time_update_tma()
221 	 * If MTC packets are dropped, we can't really tell where in this  in pt_time_update_tma()
228 	/* In both cases, we store the TMA's CTC bits until the next MTC. */  in pt_time_update_tma()
250 	/* We ignore MTCs between TSC and TMA to avoid apparent CTC overflows.  in pt_time_update_mtc()
253 	 * enough bits.  If TMA doesn't provide any of the MTC bits we may place  in pt_time_update_mtc()
265 	/* Store our CTC value if we have or would have reset FC. */  in pt_time_update_mtc()
269 	/* Prepare for the next packet in case we error out below. */  in pt_time_update_mtc()
274 	/* We recover from previous CYC losses. */  in pt_time_update_mtc()
277 	/* Avoid a big jump when we see the first MTC with an arbitrary CTC  in pt_time_update_mtc()
283 		/* If we have not seen a TMA, we ignore this first MTC.  in pt_time_update_mtc()
285 		 * We have no idea where in this MTC period tracing started.  in pt_time_update_mtc()
286 		 * We could lose an entire MTC period or just a tiny fraction.  in pt_time_update_mtc()
288 		 * On the other hand, if we assumed a previous MTC value, we  in pt_time_update_mtc()
295 		 * we would have treated the TMA as an MTC.  in pt_time_update_mtc()
306 		/* We estimate the high-order CTC bits that are not provided by  in pt_time_update_mtc()
309 		 * We assume that no MTC packets were dropped around TMA.  If  in pt_time_update_mtc()
310 		 * there are, we might place the TSC into the wrong MTC period  in pt_time_update_mtc()
314 		 * Note that we may underflow which results in more bits to be  in pt_time_update_mtc()
344  * Depending on the CYC threshold, we may not get a CYC for each MTC, so a CYC
347  * We can't do much about the overlap case without examining all packets in
348  * the respective periods.  We leave this as expected imprecision.
350  * If we find a CYC packet to span multiple MTC packets, though, we try to
354  * We only consider MTC.  For the first CYC after TSC, the corresponding TMA
395 	/* Make sure we don't wrap around.  If we would, attribute the entire  in pt_time_adjust_cyc()
398 	 * We lost an unknown portion of the CYC payload for the current MTC  in pt_time_adjust_cyc()
508 	/* A TSC outside of PSB+ may indicate loss of time.  We do not use it  in pt_tcal_update_tsc()
509 	 * for calibration.  We store the TSC value for calibration at the next  in pt_tcal_update_tsc()
554 	/* We shift the nominator to improve rounding precision.  in pt_tcal_header_tsc()
556 	 * Since we're only collecting the CYCs between two TSC, we shouldn't  in pt_tcal_header_tsc()
592 	/* If we know the nominal frequency, we can use it for calibration. */  in pt_tcal_header_cbr()
635 	/* We need at least two MTC (including this). */  in pt_tcal_update_mtc()
644 	/* Without any cycles, we can't calibrate.  Try again at the next  in pt_tcal_update_mtc()
650 	/* Prepare for the next packet in case we error out below. */  in pt_tcal_update_mtc()
655 	/* Let's pretend we will fail.  We'll correct it at the end. */  in pt_tcal_update_mtc()
666 	/* We shift the nominator to improve rounding precision.  in pt_tcal_update_mtc()
668 	 * Since we're only collecting the CYCs between two MTC, we shouldn't  in pt_tcal_update_mtc()
679 	 * We skip this MTC if we lost one or more MTC since the last PSB or if  in pt_tcal_update_mtc()
680 	 * it looks like we lost a wrap CYC packet.  in pt_tcal_update_mtc()
682 	 * This is not an error but we count that MTC as lost.  in pt_tcal_update_mtc()
685 		/* If we lost one or more MTC, the case is clear. */  in pt_tcal_update_mtc()
689 		/* The case is less clear for a lost wrap CYC packet since we do  in pt_tcal_update_mtc()
696 		 * We restrict the workaround to higher MTC frequencies (lower  in pt_tcal_update_mtc()
699 		 * We also need a previous FCR so we know how many cycles to  in pt_tcal_update_mtc()
705 			/* We choose a slightly lower adjustment to account for  in pt_tcal_update_mtc()
710 			/* If we didn't drop a wrap CYC, @dfc should be way  in pt_tcal_update_mtc()
711 			 * bigger than @fc.  If it isn't, we assume that the  in pt_tcal_update_mtc()
723 	/* We updated the FCR.  This recovers from previous MTC losses. */  in pt_tcal_update_mtc()