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Commit Graph

2158 Commits

Author SHA1 Message Date
Andrew Waterman
34d86ef665 Revert "Avoid data corruption under correctable tag error during flush (#1130)"
This reverts commit 44eb4d12b5.
2017-11-29 16:09:30 -08:00
Andrew Waterman
44eb4d12b5 Avoid data corruption under correctable tag error during flush (#1130)
This esoteric bug manifests if a tag-read error occurs when a FENCE.I is
executed, even if the error was correctable.  Subsequently, an attempt to
flush a dirty line may flush the wrong line's data.
2017-11-29 09:42:00 -08:00
Megan Wachs
f554ad7e2c debug: Remove workaround for Chisel 3 #527 2017-11-27 10:50:15 -08:00
Andrew Waterman
5155eb6059
Don't emit writeback state machine logic for scratchpad (#1127)
Firrtl can't DCE it because it would require analyzing the state machine.
2017-11-22 18:40:02 -06:00
Wesley W. Terpstra
6f3ff634f2 DTS: collect common DTS nodes and move timebase-frequency to cores
Putting the common DTS nodes into a shared object makes them get
emitted only one time. Plus it's better style.

timebase-frequency should really have been in the cpu nodes in the
first place according to the spec anyway. I was foolishly trying to
save bytes. However, now we really want it there in case it differs.
2017-11-20 18:09:57 -08:00
Wesley W. Terpstra
3b299397db diplomacy: bind resources to outer-most binding
This is probably the wrong thing to do, but it is expedient for now.
We need a better way to do cross-coreplex visibility.
2017-11-20 17:42:08 -08:00
Wesley W. Terpstra
44f99cd9a5 diplomacy: eliminate redundant bindings 2017-11-20 17:42:08 -08:00
Wesley W. Terpstra
baa31edf7d RocketTile: if the dcache is incoherent, report it in DTS 2017-11-20 17:42:06 -08:00
Yunsup Lee
a60d7d419d icache: add a couple cover points for I$ and ITIM iteraction 2017-11-20 13:14:38 -08:00
Andrew Waterman
5e94884f09 Fix ITIM deallocation during I$ refill causing data corruption
Deallocation can change repl_way, which violates the assumption that it
remains constant throughout refill.

The workaround described in commit 3db066303b
still suffices, provided only the hart that owns the ITIM changes the ITIM
allocation.

This subsumes commit 3db066303b.
2017-11-20 12:30:40 -08:00
Andrew Waterman
66b7a8a5ed Revert "Fix ITIM bug overwriting I$ contents when deallocating ITIM (#1079)"
This reverts commit 3db066303b.
2017-11-20 12:26:04 -08:00
Wesley W. Terpstra
ec809483b0 BusBypass: assert fail if the widths of the two slaves do not match 2017-11-18 14:37:27 -08:00
Wesley W. Terpstra
c475c78c2f BusBlocker: don't provide an (incorrect) default value for width 2017-11-18 14:33:00 -08:00
Wesley W. Terpstra
7a1937242a coreplex: provide correct bus-width for ITIM blockers 2017-11-18 14:32:37 -08:00
Henry Cook
f3575404c0 tile: bus blocker needs to know width :( 2017-11-17 20:17:17 -08:00
Henry Cook
b625e68360
tile: put a BasicBusBlocker inside RocketTile (#1115)
...instead of on the master side of the system bus.

People inheriting from HasTileMasterPort might need to add
`masterNode := tileBus.node` to their Tile child class.
2017-11-17 17:26:48 -08:00
Megan Wachs
e7704f46c8
Add some add'l debug features (#1112)
* debug: Update macros from spec

* debug: some corrections in the auto-generated files

* debug: update renamed fields

* Debug: implement the implicit ebreak option for small program buffers

* debug: clean up some unused code and add more require() explanations

* debug: make implicit ebreak false

* debug: Add the havereset/haveresetack functionality

* debug: program buffer can still be 16 even if there is an implicit ebreak
2017-11-16 17:14:41 -08:00
Wesley W. Terpstra
61ef560c75
tilelink: don't pollute TLParamters with AtomicAutomata's implementation (#1111) 2017-11-14 17:49:10 -08:00
Wesley W. Terpstra
8b79f0394e
Merge pull request #1105 from freechipsproject/axi4-xbar
axi4: add an Xbar
2017-11-14 16:18:23 -08:00
Wesley W. Terpstra
509a48c9c9
TLToAXI4: block TL early source re-use before it goes to AXI4 (#1110)
This is a follow-up to PR #1108.

Rather than increasing the number of transactions we allow to be inflight,
instead just block TL when early source re-use happens. This is a better
fix since it means we don't pay mostly wasted downstream hardware to handle
an additional transaction inflight that almost never happens.
2017-11-14 16:08:43 -08:00
Wesley W. Terpstra
e370934c50 AXI4Xbar: reduce number of special cases 2017-11-14 15:09:09 -08:00
Wesley W. Terpstra
9004ecdf25 unittest: include AXI4Xbar in regression 2017-11-14 15:09:09 -08:00
Wesley W. Terpstra
5875017956 axi4: add an Xbar 2017-11-14 15:09:09 -08:00
Wesley W. Terpstra
72c89f7e30 axi4: add a Filter suitable for manipulating test visibility 2017-11-14 15:09:09 -08:00
Wesley W. Terpstra
bfc0ba679a axi4: add a Delayer for unit tests 2017-11-14 15:09:09 -08:00
Wesley W. Terpstra
1902ba063a Filter: can claim to be out-of-order when you are not 2017-11-14 15:09:09 -08:00
Wesley W. Terpstra
58a93e2100 AXI4SRAM: handy helper object 2017-11-14 15:09:09 -08:00
Wesley W. Terpstra
353ddffc11 RAMModel: add a convenience object 2017-11-14 15:09:09 -08:00
Wesley W. Terpstra
7cfb69e2d5 Queue: silence some warnings 2017-11-14 15:09:09 -08:00
Wesley W. Terpstra
147fad6387
Fix AXI4 FIFO ordering for masters with early source reuse (#1108)
* TLToAXI4: fix WaR for single-source FIFO masters
* TLToAXI4: fix potential counter overflow => WaR hazard

If you have a FIFO master with 2^n-1 sources that performs early
source re-use, the old code could potentially break FIFO order.
2017-11-13 20:32:09 -08:00
Henry Cook
7098ebf439
rocket: fix itim GetPropertyByHartId (#1109)
needs to use RocketTileParams.hartid instead of zipWithIndex
2017-11-13 19:25:20 -08:00
Wesley W. Terpstra
0cfa801bfc
coreplex: allow MMIO to be misaligned (#1103) 2017-11-10 15:12:28 -08:00
Wesley W. Terpstra
a061b16ee3
coreplex: fix typo (#1104) 2017-11-10 15:11:56 -08:00
Andrew Waterman
4ebca73d59 Provide option to support AMOs only on I/O, not DTIM/D$ 2017-11-09 17:45:53 -08:00
Andrew Waterman
efdb418559
Merge pull request #1098 from freechipsproject/frontend
Frontend improvements
2017-11-09 17:44:38 -08:00
Andrew Waterman
d0c6cbba6b Improve frontend branch prediction
- Put correctness responsibility on Frontend, not IBuf, for improved
  separation of concerns.  Frontend must detect case that the BTB
  predicts a taken branch in the middle of an instruction.

- Pass BTB information down pipeline unconditionally, fixing case that
  screws up the branch history when the BTB misses and the instruction
  is misaligned.

- Remove jumpInFrontend option; it's now unconditional.

- Default to one-bit counters in the BHT.  For tiny BHTs like these, it's
  more resource efficient to have a larger index space than to have
  hysteresis.
2017-11-09 00:00:56 -08:00
Andrew Waterman
bb9d8264e2 "Correct" ITIM uncorrectable errors
This permits forward progress when a core wants to handle its own
uncorrectable ITIM errors.  Previously, another core had to do it.
2017-11-08 22:15:03 -08:00
Andrew Waterman
5c1b34d854 Don't report a TL error if overwriting a whole ITIM word 2017-11-08 22:15:03 -08:00
Andrew Waterman
9b16d25861 Fix reporting of ITIM error addresses on slave-port accesses 2017-11-08 22:15:03 -08:00
Wesley W. Terpstra
b59880fe8e
Fragmenter: add an option for earlyAck only on PutFulls (#1095)
Fragmenter: add a third case for earlyAck (PutFulls only)

It seems quite common to have a device that is backed by ECC. When
performing a multibeat PutPartial, these devices can exhibit their
first error on the last beat (if it had an incomplete write mask
for that beat, which required read-write-modifying corrupted data).

Generally, these devices have ECC granularity <= the bus width. In
those cases, if you send a PutFull, the first beat carries the
error value for the whole burst. Consider:
  If the PutFull was below the granularity, it was a single beat.
  If the PutFull was multi-beat, it exceeds the granularity.

Therefore, an important variation on the earlyAck optimization is
the case where only PutFulls receive an earlyAck.
2017-11-08 15:31:19 -08:00
Andrew Waterman
4514adb77c
Merge pull request #1093 from freechipsproject/local-error-interrupt
generate local interrupts on bus/ecc errors
2017-11-07 14:19:53 -08:00
Henry Cook
d096fd206b
coreplex: WithStatelessBridge => WithIncoherentTiles (#1092) 2017-11-07 13:47:56 -08:00
Andrew Waterman
34f38b0fb1 Don't permit vectoring of high interrupts
Send them to the base of the vector to obviate an adder
2017-11-07 01:59:30 -08:00
Andrew Waterman
6176b348dc Invalidate TL error bit in D$ once progress is made 2017-11-07 00:52:18 -08:00
Andrew Waterman
d8d4504995 Provide separate masks for local & global BusErrorUnit interrupts 2017-11-06 18:03:59 -08:00
Andrew Waterman
be3a3e0187 Generate local interrupt #128 on bus errors
It doesn't have a correpsonding bit in mip/mie, so it isn't individually
maskable, nor is it delegable.
2017-11-06 18:03:59 -08:00
Andrew Waterman
ac096a89e7 Make BusErrorUnit support 32-bit stores
Otherwise it isn't too useful for RV32!
2017-11-06 18:03:59 -08:00
Andrew Waterman
6357db0b12 Expose BusErrorUnit non-diplomatically for use as local interrupt 2017-11-06 18:03:59 -08:00
Andrew Waterman
bdda2cb145
Merge pull request #1089 from freechipsproject/aswaterman-patch-1
Don't emit PTW covers when !usingVM
2017-11-06 18:03:36 -08:00
Andrew Waterman
95d00b13cc Report ITIM slave port errors to BusErrorUnit 2017-11-06 12:39:17 -08:00