riscv/rocket-chip
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1766 Commits

Author SHA1 Message Date
Andrew Waterman
83875e3a0c Only flush D$ on FENCE.I if it won't always be probed on I$ miss 2017-08-05 14:22:40 -07:00
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
bc298bf146 Optimize ShiftQueue for late-arriving deq.ready 2017-08-04 22:06:37 -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
Megan Wachs
017ac130c1 Merge pull request #922 from freechipsproject/bigger_tl_xbar 
TLXbar: Allow more masters and slaves and issue a warning.
 2017-08-03 16:52:56 -07:00
Megan Wachs
50c85f1b62 TLXbar: Allow more masters and slaves and issue a warning. 2017-08-03 15:46:06 -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
d66e8f8e80 Merge pull request #914 from freechipsproject/critical-paths 
Fix some critical paths
 2017-08-02 19:05:31 -07:00
Megan Wachs
3fc7100048 Merge pull request #917 from freechipsproject/fuzzer_order 
TLFuzzer: Allow Ordered clients to be created as well by the fuzzer
 2017-08-02 18:39:59 -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
Megan Wachs
595415d207 TLFuzzer: Correct the number of ordered clients created 2017-08-02 15:48:21 -07:00
Megan Wachs
fc5c04ed4b TLFuzzer: Allow Ordered clients to be created as well by the fuzzer 2017-08-02 14:44:18 -07:00
Andrew Waterman
7d2dd3769f Optimize a hazard check critical path 2017-08-02 14:27:25 -07:00
Megan Wachs
85bdae0fa8 diplomacy: Pretty Print for TransferSizes 2017-08-02 11:40:50 -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
Yunsup Lee
6ef8ee5d4d tilelink: add mask rom 2017-07-31 21:34:04 -07:00
Yunsup Lee
4b33249812 Merge pull request #911 from freechipsproject/fix-dcache-bug 
Fix D$ ready-valid signaling bug
 2017-07-31 19:14:16 -07:00
Wesley W. Terpstra
42ff74bd34 Merge pull request #910 from freechipsproject/tilelink-map 
Tilelink map
 2017-07-31 18:33:09 -07:00
Andrew Waterman
e140893a01 Use 1-entry queue on processor-side E-channel 
The cache can't sink a grant every cycle, so extra E buffering doesn't help.
 2017-07-31 18:06:54 -07:00
Andrew Waterman
5681693ccc Fix a D$ ready-valid signaling regression 
I broke this in 66d06460fa.
 2017-07-31 18:05:14 -07:00
Wesley W. Terpstra
d7fd9d2b82 tilelink: Filter, add another case 2017-07-31 16:51:26 -07:00
Yunsup Lee
71a250b071 Merge pull request #909 from freechipsproject/tile-buffer 
add optional tile boundary buffers
 2017-07-31 16:46:22 -07:00
Wesley W. Terpstra
b126105230 tilelink: add TLMap to make it possible to move slaves 2017-07-31 16:39:00 -07:00
Wesley W. Terpstra
13d3ffbcaa tilelink: Filter now support arbitrary filter functions 2017-07-31 16:38:38 -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
Yunsup Lee
f473e6bad0 tile: add optional boundary buffers 2017-07-31 15:57:22 -07:00
Yunsup Lee
cb3529bbc3 util: tweak rational crossings to avoid mux in source 2017-07-31 15:10:15 -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
Wesley W. Terpstra
8e2e931770 Merge pull request #903 from freechipsproject/monitor-probes 
tilelink: use the Monitor to enforce Probe sourcing
 2017-07-29 01:12:08 -07:00
Wesley W. Terpstra
56e28026a6 TLError: does not need to be fast; cut the loop 
The SystemBus already has a flow buffer on outputs.
 2017-07-29 00:22:21 -07:00
Wesley W. Terpstra
540256e24a systembus: all slaves should have an output buffer 2017-07-29 00:13:33 -07:00
Wesley W. Terpstra
eadf4e9fcc Revert "tile: add option for tile boundary buffers" 
This reverts commit b64b87ad07.

The crossings already have buffering in those places where it was
appropriate. Adding more does not help flow through paths.
 2017-07-29 00:03:24 -07:00
Wesley W. Terpstra
68064ba260 systembus: don't double down on buffers 
The order should be:
  master => buffer|xing => fifofixer => splitter => xbar
 2017-07-29 00:02:12 -07:00