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lsu_unit pending queue bug fix

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This commit is contained in:
Blaise Tine 2021-05-03 12:25:44 -07:00
parent ba16e88eab
commit 228aee1ec7
1 changed files with 44 additions and 23 deletions
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67
hw/rtl/VX_lsu_unit.v
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@ -44,10 +44,6 @@ module VX_lsu_unit #(
end
wire is_dup_load = lsu_req_if.wb && lsu_req_if.tmask[0] && (& addr_matches);
`IGNORE_WARNINGS_BEGIN
reg [`LSUQ_SIZE-1:0][`DCORE_TAG_ID_BITS-1:0] pending_tags;
`IGNORE_WARNINGS_END
wire ready_in;
wire stall_in = ~ready_in && req_valid;
@ -79,7 +75,7 @@ module VX_lsu_unit #(
wire [`NUM_THREADS-1:0] rsp_tmask;
reg [`NUM_THREADS-1:0] req_sent_mask;
wire sent_all_ready;
wire req_ready_all;
wire [`DCORE_TAG_ID_BITS-1:0] mbuf_waddr, mbuf_raddr;
wire mbuf_full;
@ -118,7 +114,7 @@ module VX_lsu_unit #(
`UNUSED_PIN (empty)
);
assign sent_all_ready = &(dcache_req_if.ready | req_sent_mask);
assign req_ready_all = &(dcache_req_if.ready | req_sent_mask | ~req_tmask);
wire [`NUM_THREADS-1:0] req_sent_dup = {{(`NUM_THREADS-1){dcache_req_fire[0] && req_is_dup}}, 1'b0};
@ -126,19 +122,20 @@ module VX_lsu_unit #(
if (reset) begin
req_sent_mask <= 0;
end else begin
if (sent_all_ready)
if (req_ready_all)
req_sent_mask <= 0;
else
req_sent_mask <= req_sent_mask | dcache_req_fire | req_sent_dup;
end
end
wire is_req_start = (0 == req_sent_mask);
// need to hold the acquired tag index until the full request is submitted
reg [`DCORE_TAG_ID_BITS-1:0] req_tag_hold;
wire [`DCORE_TAG_ID_BITS-1:0] req_tag = (0 == req_sent_mask) ? mbuf_waddr : req_tag_hold;
wire [`DCORE_TAG_ID_BITS-1:0] req_tag = is_req_start ? mbuf_waddr : req_tag_hold;
always @(posedge clk) begin
if (mbuf_push) begin
pending_tags[mbuf_waddr] <= req_tag;
req_tag_hold <= mbuf_waddr;
end
end
@ -156,7 +153,8 @@ module VX_lsu_unit #(
end
end
wire req_ready_dep = (req_wb && ~mbuf_full)
// ensure all dependencies for the requests are resolved
wire req_dep_ready = (req_wb && (~mbuf_full || ~is_req_start))
|| (~req_wb && st_commit_if.ready);
// DCache Request
@ -189,7 +187,7 @@ module VX_lsu_unit #(
end
end
assign dcache_req_if.valid = {`NUM_THREADS{req_valid && req_ready_dep}} & req_tmask_dup & ~req_sent_mask;
assign dcache_req_if.valid = {`NUM_THREADS{req_valid && req_dep_ready}} & req_tmask_dup & ~req_sent_mask;
assign dcache_req_if.rw = {`NUM_THREADS{~req_wb}};
assign dcache_req_if.addr = mem_req_addr;
assign dcache_req_if.byteen = mem_req_byteen;
@ -201,11 +199,11 @@ module VX_lsu_unit #(
assign dcache_req_if.tag = {`NUM_THREADS{req_tag}};
`endif
assign ready_in = req_ready_dep && sent_all_ready;
assign ready_in = req_dep_ready && req_ready_all;
// send store commit
wire is_store_rsp = req_valid && ~req_wb && sent_all_ready;
wire is_store_rsp = req_valid && ~req_wb && req_ready_all;
assign st_commit_if.valid = is_store_rsp;
assign st_commit_if.wid = req_wid;
@ -276,23 +274,46 @@ module VX_lsu_unit #(
`SCOPE_ASSIGN (dcache_rsp_tag, mbuf_raddr);
`ifdef DBG_PRINT_CORE_DCACHE
`IGNORE_WARNINGS_BEGIN
reg [`LSUQ_SIZE-1:0][`DCORE_TAG_WIDTH:0] pending_reqs;
`IGNORE_WARNINGS_END
always @(posedge clk) begin
if (reset) begin
pending_reqs <= '0;
end else if (mbuf_push) begin
pending_reqs[mbuf_waddr] <= {dcache_req_if.tag[0], 1'b1};
end else if (mbuf_pop) begin
pending_reqs[mbuf_raddr] <= '0;
end
end
always @(posedge clk) begin
if ((| dcache_req_fire)) begin
if ((| dcache_req_if.rw))
$display("%t: D$%0d Wr Req: wid=%0d, PC=%0h, tmask=%b, addr=%0h, tag=%0h, byteen=%0h, data=%0h",
$time, CORE_ID, req_wid, req_pc, dcache_req_fire, req_addr, dcache_req_if.tag, dcache_req_if.byteen, dcache_req_if.data);
else
$display("%t: D$%0d Rd Req: wid=%0d, PC=%0h, tmask=%b, addr=%0h, tag=%0h, byteen=%0h, rd=%0d, is_dup=%b",
$time, CORE_ID, req_wid, req_pc, dcache_req_fire, req_addr, dcache_req_if.tag, dcache_req_if.byteen, req_rd, req_is_dup);
if (dcache_req_if.rw[0]) begin
$write("%t: D$%0d Wr Req: wid=%0d, PC=%0h, tmask=%b, addr=", $time, CORE_ID, req_wid, req_pc, dcache_req_fire);
`PRINT_ARRAY1D(req_addr, `NUM_THREADS);
$write(", tag=%0h, byteen=%0h, data=", dcache_req_if.tag[0], dcache_req_if.byteen);
`PRINT_ARRAY1D(dcache_req_if.data, `NUM_THREADS);
$write("\n");
end else begin
$write("%t: D$%0d Rd Req: wid=%0d, PC=%0h, tmask=%b, addr=", $time, CORE_ID, req_wid, req_pc, dcache_req_fire);
`PRINT_ARRAY1D(req_addr, `NUM_THREADS);
$write(", tag=%0h, byteen=%0h, rd=%0d, is_dup=%b\n", dcache_req_if.tag[0], dcache_req_if.byteen, req_rd, req_is_dup);
end
end
if (dcache_rsp_fire) begin
$display("%t: D$%0d Rsp: valid=%b, wid=%0d, PC=%0h, tag=%0h, rd=%0d, data=%0h, is_dup=%b",
$time, CORE_ID, dcache_rsp_if.valid, rsp_wid, rsp_pc, dcache_rsp_if.tag, rsp_rd, dcache_rsp_if.data, rsp_is_dup);
$write("%t: D$%0d Rsp: valid=%b, wid=%0d, PC=%0h, tag=%0h, rd=%0d, data=",
$time, CORE_ID, dcache_rsp_if.valid, rsp_wid, rsp_pc, dcache_rsp_if.tag, rsp_rd);
`PRINT_ARRAY1D(dcache_rsp_if.data, `NUM_THREADS);
$write("is_dup=%b\n", rsp_is_dup);
end
if (mbuf_full) begin
$write("%t: D$%0d queue-full:", $time, CORE_ID);
$write("%t: *** D$%0d queue-full:", $time, CORE_ID);
for (integer j = 0; j < `LSUQ_SIZE; j++) begin
$write(" tag%0d=%0h", j, pending_tags[j]);
if (pending_reqs[j][0]) begin
$write(" %0d->%0h", j, pending_reqs[j][1 +: `DCORE_TAG_WIDTH]);
end
end
$write("\n");
end