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refactoring all arbiters with buffering for request count > 2, optimized the cache core response module in critical path when running as L2

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This commit is contained in:
Blaise Tine
2020-11-08 01:31:46 -08:00
parent b14007f930
commit 10505caae1
19 changed files with 602 additions and 534 deletions
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54
hw/rtl/cache/VX_snp_forwarder.v vendored
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@@ -93,24 +93,46 @@ module VX_snp_forwarder #(
assign snp_req_ready = !sfq_full && fwdout_ready;
reg [`REQS_BITS-1:0] fwdin_sel;
if (NUM_REQUESTS > 1) begin
wire sel_valid;
wire [`REQS_BITS-1:0] sel_idx;
wire [NUM_REQUESTS-1:0] sel_1hot;
VX_fixed_arbiter #(
.N(NUM_REQUESTS)
) arbiter (
.clk (clk),
.reset (reset),
.requests (snp_fwdin_valid),
.grant_index (fwdin_sel),
`UNUSED_PIN (grant_valid),
`UNUSED_PIN (grant_onehot)
);
VX_fixed_arbiter #(
.N(NUM_REQUESTS)
) sel_arb (
.clk (clk),
.reset (reset),
.requests (snp_fwdin_valid),
.grant_valid (sel_valid),
.grant_index (sel_idx),
.grant_onehot (sel_1hot)
);
assign fwdin_valid = snp_fwdin_valid[fwdin_sel];
assign fwdin_tag = snp_fwdin_tag[fwdin_sel];
assign fwdin_valid = snp_fwdin_valid[sel_idx];
assign fwdin_tag = snp_fwdin_tag[sel_idx];
for (genvar i = 0; i < NUM_REQUESTS; i++) begin
assign snp_fwdin_ready[i] = fwdin_ready && (fwdin_sel == `REQS_BITS'(i));
wire stall = fwdin_valid && ~fwdin_ready;
VX_generic_register #(
.N(1 + `LOG2UP(SNRQ_SIZE)),
.PASSTHRU(NUM_REQUESTS <= 2)
) pipe_reg (
.clk (clk),
.reset (reset),
.stall (stall),
.flush (1'b0),
.in ({sel_valid, snp_fwdin_tag[sel_idx]}),
.out ({fwdin_valid, fwdin_tag})
);
for (genvar i = 0; i < NUM_REQUESTS; i++) begin
assign snp_fwdin_ready[i] = sel_1hot[i] && !stall;
end
end else begin
assign fwdin_valid = snp_fwdin_valid;
assign fwdin_tag = snp_fwdin_tag;
assign snp_fwdin_ready = fwdin_ready;
end
`ifdef DBG_PRINT_CACHE_SNP
@@ -122,7 +144,7 @@ module VX_snp_forwarder #(
$display("%t: cache%0d snp-fwd-out: addr=%0h, invalidate=%0d, tag=%0h", $time, CACHE_ID, `DRAM_TO_BYTE_ADDR(snp_fwdout_addr[0]), snp_fwdout_invalidate[0], snp_fwdout_tag[0]);
end
if (fwdin_valid && fwdin_ready) begin
$display("%t: cache%0d snp-fwd-in[%0d]: tag=%0h", $time, CACHE_ID, fwdin_sel, fwdin_tag);
$display("%t: cache%0d snp-fwd-in: tag=%0h", $time, CACHE_ID, fwdin_tag);
end
if (snp_rsp_valid && snp_rsp_ready) begin
$display("%t: cache%0d snp-fwd-rsp: addr=%0h, invalidate=%0d, tag=%0h", $time, CACHE_ID, snp_rsp_addr, snp_rsp_invalidate, snp_rsp_tag);