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replace instances of code duplication for i$ exclusions w/commands

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This commit is contained in:
Alec Vercruysse 2023-04-14 16:54:55 -07:00
parent a52eb01407
commit 862d1e0116
4 changed files with 25 additions and 36 deletions
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11
sim/coverage-exclusions-rv64gc.do
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@ -62,6 +62,17 @@ coverage exclude -scope /dut/core/ifu/bus/icache/icache/cachefsm -linerange $sta
coverage exclude -scope /dut/core/ifu/bus/icache/icache/cachefsm -linerange [GetLineNum ../src/cache/cachefsm.sv "exclusion-tag: icache CacheBusW"]
coverage exclude -scope /dut/core/ifu/bus/icache/icache/cachefsm -linerange [GetLineNum ../src/cache/cachefsm.sv "exclusion-tag: icache SelAdrCauses"] -item e 1 -fecexprrow 4 10
coverage exclude -scope /dut/core/ifu/bus/icache/icache/cachefsm -linerange [GetLineNum ../src/cache/cachefsm.sv "exclusion-tag: icache CacheBusRCauses"] -item e 1 -fecexprrow 1-2 12
# cache.sv AdrSelMux and CacheBusAdrMux, excluding unhit Flush branch
coverage exclude -scope /dut/core/ifu/bus/icache/icache/AdrSelMux -linerange [GetLineNum ../src/generic/mux.sv "exclusion-tag: mux3"] -item b 1
coverage exclude -scope /dut/core/ifu/bus/icache/icache/CacheBusAdrMux -linerange [GetLineNum ../src/generic/mux.sv "exclusion-tag: mux3"] -item b 1 3
# CacheWay Dirty logic. -scope does not accept wildcards.
set numcacheways 4
for {set i 0} {$i < $numcacheways} {incr i} {
coverage exclude -scope /dut/core/ifu/bus/icache/icache/CacheWays[$i] -linerange [GetLineNum ../src/cache/cacheway.sv "exclusion-tag: icache SetDirtyWay"] -item e 1
coverage exclude -scope /dut/core/ifu/bus/icache/icache/CacheWays[$i] -linerange [GetLineNum ../src/cache/cacheway.sv "exclusion-tag: icache SelectedWiteWordEn"] -item e 1 -fecexprrow 4 6
# below: flushD can't go high during an icache write b/c of pipeline stall
coverage exclude -scope /dut/core/ifu/bus/icache/icache/CacheWays[$i] -linerange [GetLineNum ../src/cache/cacheway.sv "exclusion-tag: icache SetValidEN"] -item e 1 -fecexprrow 4
}
######################
# Toggle exclusions

26
src/cache/cache.sv vendored
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@ -73,6 +73,7 @@ module cache #(parameter LINELEN, NUMLINES, NUMWAYS, LOGBWPL, WORDLEN, MUXINTE
logic SelAdr;
logic [1:0] AdrSelMuxSel;
logic [SETLEN-1:0] CacheSet;
logic [LINELEN-1:0] LineWriteData;
logic ClearDirty, SetDirty, SetValid;
@ -108,18 +109,10 @@ module cache #(parameter LINELEN, NUMLINES, NUMWAYS, LOGBWPL, WORDLEN, MUXINTE
// and FlushAdr when handling D$ flushes
// The icache must update to the newest PCNextF on flush as it is probably a trap. Trap
// sets PCNextF to XTVEC and the icache must start reading the instruction.
if (!READ_ONLY_CACHE) begin
logic [1:0] AdrSelMuxSel;
assign AdrSelMuxSel = {SelFlush, SelAdr | SelHPTW};
mux3 #(SETLEN) AdrSelMux(NextSet[SETTOP-1:OFFSETLEN], PAdr[SETTOP-1:OFFSETLEN], FlushAdr,
assign AdrSelMuxSel = {SelFlush, ((SelAdr | SelHPTW) & ~((READ_ONLY_CACHE == 1) & FlushStage))};
mux3 #(SETLEN) AdrSelMux(NextSet[SETTOP-1:OFFSETLEN], PAdr[SETTOP-1:OFFSETLEN], FlushAdr,
AdrSelMuxSel, CacheSet);
end
else begin
logic AdrSelMuxSel;
assign AdrSelMuxSel = ((SelAdr | SelHPTW) & ~FlushStage);
mux2 #(SETLEN) AdrSelMux(NextSet[SETTOP-1:OFFSETLEN], PAdr[SETTOP-1:OFFSETLEN],
AdrSelMuxSel, CacheSet);
end
// Array of cache ways, along with victim, hit, dirty, and read merging logic
cacheway #(NUMLINES, LINELEN, TAGLEN, OFFSETLEN, SETLEN, READ_ONLY_CACHE) CacheWays[NUMWAYS-1:0](
.clk, .reset, .CacheEn, .CacheSet, .PAdr, .LineWriteData, .LineByteMask,
@ -159,13 +152,10 @@ module cache #(parameter LINELEN, NUMLINES, NUMWAYS, LOGBWPL, WORDLEN, MUXINTE
.PAdr(WordOffsetAddr), .ReadDataLine, .ReadDataWord);
// Bus address for fetch, writeback, or flush writeback
if (!READ_ONLY_CACHE)
mux3 #(`PA_BITS) CacheBusAdrMux(.d0({PAdr[`PA_BITS-1:OFFSETLEN], {OFFSETLEN{1'b0}}}),
.d1({Tag, PAdr[SETTOP-1:OFFSETLEN], {OFFSETLEN{1'b0}}}),
.d2({Tag, FlushAdr, {OFFSETLEN{1'b0}}}),
.s({SelFlush, SelWriteback}), .y(CacheBusAdr));
else
assign CacheBusAdr = {PAdr[`PA_BITS-1:OFFSETLEN], {OFFSETLEN{1'b0}}};
mux3 #(`PA_BITS) CacheBusAdrMux(.d0({PAdr[`PA_BITS-1:OFFSETLEN], {OFFSETLEN{1'b0}}}),
.d1({Tag, PAdr[SETTOP-1:OFFSETLEN], {OFFSETLEN{1'b0}}}),
.d2({Tag, FlushAdr, {OFFSETLEN{1'b0}}}),
.s({SelFlush, SelWriteback}), .y(CacheBusAdr));
/////////////////////////////////////////////////////////////////////////////////////////////
// Write Path

20
src/cache/cacheway.sv vendored
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@ -97,22 +97,10 @@ module cacheway #(parameter NUMLINES=512, LINELEN = 256, TAGLEN = 26,
/////////////////////////////////////////////////////////////////////////////////////////////
assign SetValidWay = SetValid & SelData;
if (!READ_ONLY_CACHE) begin
assign SetDirtyWay = SetDirty & SelData;
assign ClearDirtyWay = ClearDirty & SelData;
assign SelectedWriteWordEn = (SetValidWay | SetDirtyWay) & ~FlushStage;
assign SetValidEN = SetValidWay & ~FlushStage;
end
else begin
// Don't cover FlushStage assertion during SetValidWay.
// it's not explicitely gated anywhere, but for read-only caches,
// there's no way that a FlushD can happen during the write stage
// of a fetch.
// coverage off -item e 1 -fecexprrow 4
assign SelectedWriteWordEn = SetValidWay & ~FlushStage;
// coverage off -item e 1 -fecexprrow 4
assign SetValidEN = SetValidWay & ~FlushStage;
end
assign SetDirtyWay = SetDirty & SelData; // exclusion-tag: icache SetDirtyWay
assign ClearDirtyWay = ClearDirty & SelData;
assign SelectedWriteWordEn = (SetValidWay | SetDirtyWay) & ~FlushStage; // exclusion-tag: icache SelectedWiteWordEn
assign SetValidEN = SetValidWay & ~FlushStage; // exclusion-tag: icache SetValidEN
// If writing the whole line set all write enables to 1, else only set the correct word.
assign FinalByteMask = SetValidWay ? '1 : LineByteMask; // OR

2
src/generic/mux.sv
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@ -40,7 +40,7 @@ module mux3 #(parameter WIDTH = 8) (
input logic [1:0] s,
output logic [WIDTH-1:0] y);
assign y = s[1] ? d2 : (s[0] ? d1 : d0);
assign y = s[1] ? d2 : (s[0] ? d1 : d0); // exclusion-tag: mux3
endmodule
module mux4 #(parameter WIDTH = 8) (