riscv/rocket-chip
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406 Commits

Author SHA1 Message Date
Andrew Waterman
991e16de92 Remove probe address mux from TLB response path 2017-08-05 12:57:38 -07:00
Andrew Waterman
b9b4142bb4 Get s2_nack off the critical path 
We were using it to compute the next PC on flush vs. replay (which require
PC+4 and PC, respectively).  This fix gets rid of the adder altogether by
reusing the M-stage PC in the flush case, which by construction holds PC+4.
 2017-08-05 00:30:36 -07:00
Andrew Waterman
6112adfbb0 Get L2 TLB tag/parity check off the D$ arbitration path 2017-08-04 17:01:51 -07:00
Andrew Waterman
8d97684555 Fix L2 TLB perfctr 
It was counting conflict misses but not cold misses.
 2017-08-04 17:01:31 -07:00
Andrew Waterman
df7f09b9ce Get I$ ECC check further off critical path 2017-08-04 16:59:21 -07:00
Andrew Waterman
4bfbe75d74 Avoid pipeline replays when fetch queue is full 2017-08-04 16:59:21 -07:00
Andrew Waterman
a45997d03f Separate I$ parity error from miss signal 
Handle parity errors with a pipeline flush rather than a faster
frontend replay, reducing a critical path.
 2017-08-04 16:59:21 -07:00
Andrew Waterman
06a831310b Shave a gate delay off I$ backpressure path 
The deleted code was a holdover from Hwacha's vector fences.
 2017-08-04 13:12:43 -07:00
Andrew Waterman
ecc2ee366c Shave a few gate delays off IBuf control logic 
It takes a while for the pipeline to compute the stall signal, so avoid
using it until the last logic levels in the clock cycle.
 2017-08-04 13:12:43 -07:00
Andrew Waterman
7937db0c84 Merge pull request #919 from freechipsproject/imiss-perf-counter 
Fix I$ miss perfctr
 2017-08-04 01:04:23 -07:00
Andrew Waterman
ba4eecc0f0 Use UIntToOH1 (#921) 
Closes #920
 2017-08-03 14:55:39 -07:00
Andrew Waterman
f483bab4aa Fix I$ miss perfctr 
The old version was counting prefetches, too.
 2017-08-03 00:52:12 -07:00
Andrew Waterman
1be1433f04 Merge pull request #918 from freechipsproject/icache-prefetch 
Icache prefetch
 2017-08-02 21:22:20 -07:00
Andrew Waterman
2537d0d54e Optionally prefetch next I$ line into L2$ on miss 2017-08-02 17:10:56 -07:00
Andrew Waterman
744cdb2f72 Make TLB report when it's safe to prefetch within a page 2017-08-02 17:09:38 -07:00
Andrew Waterman
7d2dd3769f Optimize a hazard check critical path 2017-08-02 14:27:25 -07:00
Andrew Waterman
2eb239d03f Add option to retime D$ way mux into subsequent pipeline stage 2017-08-01 23:59:20 -07:00
Andrew Waterman
9464c6db40 Mitigate(?) frontend critical path 2017-08-01 18:51:17 -07:00
Andrew Waterman
735701382f Mitigate some I$ response valid critical paths 2017-08-01 18:51:17 -07:00
Andrew Waterman
2ecea2ef60 Don't use a pipe queue on D$ TL A-channel 
This cuts an I$->D$ path.
 2017-08-01 15:17:07 -07:00
Andrew Waterman
5681693ccc Fix a D$ ready-valid signaling regression 
I broke this in 66d06460fab4110b886fa7626697cbf39ace8cfd.
 2017-07-31 18:05:14 -07:00
Yunsup Lee
7adfd5c431 Merge pull request #906 from freechipsproject/critical-paths 
Mitigate I$->D$->I$ critical path
 2017-07-31 16:14:11 -07:00
Henry Cook
11332c1226 dcache: break potential combinatorial loop by making pstore_drain_on_miss more conservative 2017-07-31 14:03:30 -07:00
Andrew Waterman
d811692c3b Mitigate I$->D$->I$ critical path 
This seemingly irrelevant change shaves several gate delays off the I$
tl.a.valid path.
 2017-07-31 01:43:04 -07:00
Andrew Waterman
ac4339a8e7 Pass D$ backpressure to D-channel, rather than asserting 2017-07-29 11:48:36 -07:00
Andrew Waterman
edcd2c696c Avoid needless stall on E-channel back pressure 2017-07-29 11:47:58 -07:00
Andrew Waterman
fdb8935712 Improve fidelity of two perf counters 2017-07-28 13:14:04 -07:00
Andrew Waterman
4c82f6b77e Don't refill BTB on not-taken branches 2017-07-28 13:13:52 -07:00
Andrew Waterman
2e8b02e780 Merge D$ store hits when ECC is enabled 
This avoids pipeline flushes due to subword WAW hazards, as with
consecutive byte stores.
 2017-07-28 12:56:36 -07:00
Andrew Waterman
838864870e Bypass TLB refill signal to halve L2 TLB hit time 
The 4-cycle hit time is 1 cycle too long to avoid a second
pipeline replay, so it was effectively 9 cycles instead of 4.
 2017-07-28 12:56:36 -07:00
Andrew Waterman
ae1f7a95f6 Don't nack misses when there's a pending store 
That effectively increased the miss latency by 5 cycles when there was
a store hit followed by a load miss.  Since pending stores are drained
when releaseInFlight, the check I removed was redundant.
 2017-07-28 12:56:36 -07:00
Wesley W. Terpstra
9804bdc34e tilelink: remove obsolete addr_lo signal (#895) 
When we first implemented TL, we thought this was helpful, because
it made WidthWidgets stateless in all cases. However, it put too
much burden on all other masters and slaves, none of which benefitted
from this signal. Furthermore, even with addr_lo, WidthWidgets were
information lossy because when they widen, they have no information
about what to fill in the new high bits of addr_lo.
 2017-07-26 16:01:21 -07:00
Andrew Waterman
5a5b78b15e Improve L2 TLB coding style 2017-07-26 02:22:43 -07:00
Andrew Waterman
5a9c673f41 Fix L2 TLB response bug 
Sometimes, it would inform the L1 TLB that the translation was for
a superpage, even though that's never the case.
 2017-07-26 02:20:41 -07:00
Andrew Waterman
acca0fccf5 Fix BTB not being refilled on some indirect jumps 
We are overloading the BTB-hit signal to mean that any part of the frontend
changed the control-flow, not just the BTB.  That's the right thing to do for
most of the control logic, but it means the BTB sometimes won't get refilled
when we'd like it to.  This commit makes the frontend use an invalid BTB entry
number when it, rather than the BTB, changes the control flow.  Since the
entry number is invalid, the BTB will treat it as a miss and refill itself.

This is kind of a hack, but a more palatable fix requires reworking the RVC
IBuf, which I don't have time for right now.
 2017-07-26 02:13:43 -07:00
Andrew Waterman
15878d4691 Perform some control-flow transfers within the Frontend 2017-07-25 15:19:16 -07:00
Andrew Waterman
62c4080585 Add RVC instruction patterns 2017-07-25 15:19:16 -07:00
Andrew Waterman
66d06460fa Add option for acquire-before-release 2017-07-25 15:19:16 -07:00
Andrew Waterman
86ccd935fc Add method to print perf events 2017-07-25 15:19:16 -07:00
Andrew Waterman
5df8f0d1ea Add L2 TLB miss counter 2017-07-25 15:19:16 -07:00
Henry Cook
01ca3efc2b Combine Coreplex and System Module Hierarchies (#875) 
* coreplex collapse: peripherals now in coreplex

* coreplex: better factoring of TLBusWrapper attachement points

* diplomacy: allow monitorless :*= and :=*

* rocket: don't connect monitors to tile tim slave ports

* rename chip package to system

* coreplex: only sbus has a splitter

* TLFragmenter: Continuing my spot battles on requires without explanatory strings

* pbus: toFixedWidthSingleBeatSlave

* tilelink: more verbose requires

* use the new system package for regression

* sbus: add more explicit FIFO attachment points

* delete leftover top-level utils

* cleanup ResetVector and RTC
 2017-07-23 08:31:04 -07:00
Wesley W. Terpstra
4eface8a9e rocket: do not require FIFO order for memory-like regions 2017-07-12 17:39:00 -07:00
Henry Cook
4c595d175c Refactor package hierarchy and remove legacy bus protocol implementations (#845) 
* Refactors package hierarchy.

Additionally:
  - Removes legacy ground tests and configs
  - Removes legacy bus protocol implementations
  - Removes NTiles
  - Adds devices package
  - Adds more functions to util package
 2017-07-07 10:48:16 -07:00
Andrew Waterman
a0cbc376b4 Merge pull request #849 from freechipsproject/l2-tlb 
L1 memory system improvements
 2017-07-06 13:03:06 -07:00
Andrew Waterman
e1cc0a0a0e Mask debug interrupts similarly to other interrupts (#847) 
This makes single-step exceptions higher-priority than debug interrupts.
 2017-07-06 12:03:24 -07:00
Andrew Waterman
b2351c5fbf Use consistent casing 2017-07-06 11:16:56 -07:00
Andrew Waterman
be4eceec0d Fix stupid D$ probe bug 2017-07-06 01:20:47 -07:00
Andrew Waterman
90a7d6a343 Add L2 TLB option 2017-07-06 01:19:18 -07:00
Andrew Waterman
438abc76d2 Handle TL errors in L1 I$ 
Cache the error bit in the tag array; report precisely on access.
 2017-07-06 01:02:11 -07:00
Andrew Waterman
0ef45fac9b Add tag ECC to D$ 2017-07-03 18:16:37 -07:00