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adding tracking for SFU stalls

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This commit is contained in:
Blaise Tine
2023-12-28 12:12:11 -08:00
parent c7a81d1493
commit e217bc2c23
27 changed files with 1266 additions and 1166 deletions
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136
hw/rtl/core/VX_scoreboard.sv
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@@ -21,7 +21,8 @@ module VX_scoreboard import VX_gpu_pkg::*; #(
`ifdef PERF_ENABLE
output reg [`PERF_CTR_BITS-1:0] perf_scb_stalls,
output reg [`PERF_CTR_BITS-1:0] perf_scb_uses [`NUM_EX_UNITS],
output reg [`PERF_CTR_BITS-1:0] perf_units_uses [`NUM_EX_UNITS],
output reg [`PERF_CTR_BITS-1:0] perf_sfu_uses [`NUM_SFU_UNITS],
`endif
VX_writeback_if.slave writeback_if [`ISSUE_WIDTH],
@@ -32,21 +33,66 @@ module VX_scoreboard import VX_gpu_pkg::*; #(
localparam DATAW = `UUID_WIDTH + ISSUE_WIS_W + `NUM_THREADS + `XLEN + `EX_BITS + `INST_OP_BITS + `INST_MOD_BITS + 1 + 1 + `XLEN + (`NR_BITS * 4) + 1;
`ifdef PERF_ENABLE
wire [`NUM_EX_UNITS-1:0] perf_uses_per_cycle;
wire [`CLOG2(`ISSUE_WIDTH+1)-1:0] perf_stalls_per_cycle;
reg [`ISSUE_WIDTH-1:0][`NUM_EX_UNITS-1:0] perf_issue_uses_per_cycle;
wire [`ISSUE_WIDTH-1:0] perf_issue_stalls_per_cycle;
reg [`ISSUE_WIDTH-1:0][`NUM_EX_UNITS-1:0] perf_issue_units_per_cycle;
wire [`NUM_EX_UNITS-1:0] perf_units_per_cycle, perf_units_per_cycle_r;
`POP_COUNT(perf_stalls_per_cycle, perf_issue_stalls_per_cycle);
reg [`ISSUE_WIDTH-1:0][`NUM_SFU_UNITS-1:0] perf_issue_sfu_per_cycle;
wire [`NUM_SFU_UNITS-1:0] perf_sfu_per_cycle, perf_sfu_per_cycle_r;
wire [`ISSUE_WIDTH-1:0] perf_issue_stalls_per_cycle;
wire [`CLOG2(`ISSUE_WIDTH+1)-1:0] perf_stalls_per_cycle, perf_stalls_per_cycle_r;
`POP_COUNT(perf_stalls_per_cycle, perf_issue_stalls_per_cycle);
VX_reduce #(
.DATAW_IN (`NUM_EX_UNITS),
.N (`ISSUE_WIDTH),
.OP ("|")
) reduce (
.data_in (perf_issue_uses_per_cycle),
.data_out (perf_uses_per_cycle)
) perf_units_reduce (
.data_in (perf_issue_units_per_cycle),
.data_out (perf_units_per_cycle)
);
VX_reduce #(
.DATAW_IN (`NUM_SFU_UNITS),
.N (`ISSUE_WIDTH),
.OP ("|")
) perf_sfu_reduce (
.data_in (perf_issue_sfu_per_cycle),
.data_out (perf_sfu_per_cycle)
);
`BUFFER(perf_stalls_per_cycle_r, perf_stalls_per_cycle);
`BUFFER(perf_units_per_cycle_r, perf_units_per_cycle);
`BUFFER(perf_sfu_per_cycle_r, perf_sfu_per_cycle);
always @(posedge clk) begin
if (reset) begin
perf_scb_stalls <= '0;
end else begin
perf_scb_stalls <= perf_scb_stalls + `PERF_CTR_BITS'(perf_stalls_per_cycle_r);
end
end
for (genvar i = 0; i < `NUM_EX_UNITS; ++i) begin
always @(posedge clk) begin
if (reset) begin
perf_units_uses[i] <= '0;
end else begin
perf_units_uses[i] <= perf_units_uses[i] + `PERF_CTR_BITS'(perf_units_per_cycle_r[i]);
end
end
end
for (genvar i = 0; i < `NUM_SFU_UNITS; ++i) begin
always @(posedge clk) begin
if (reset) begin
perf_sfu_uses[i] <= '0;
end else begin
perf_sfu_uses[i] <= perf_sfu_uses[i] + `PERF_CTR_BITS'(perf_sfu_per_cycle_r[i]);
end
end
end
`endif
for (genvar i = 0; i < `ISSUE_WIDTH; ++i) begin
@@ -60,21 +106,46 @@ module VX_scoreboard import VX_gpu_pkg::*; #(
wire inuse_rs3 = inuse_regs[ibuffer_if[i].data.wis][ibuffer_if[i].data.rs3];
`ifdef PERF_ENABLE
reg [`UP(ISSUE_RATIO)-1:0][`NUM_REGS-1:0][`EX_BITS-1:0] inuse_units;
reg [`UP(ISSUE_RATIO)-1:0][`NUM_REGS-1:0][`EX_WIDTH-1:0] inuse_units;
reg [`UP(ISSUE_RATIO)-1:0][`NUM_REGS-1:0][`SFU_WIDTH-1:0] inuse_sfu;
reg [`SFU_WIDTH-1:0] sfu_type;
always @(*) begin
perf_issue_uses_per_cycle[i] = '0;
case (scoreboard_if[i].data.op_type)
`INST_SFU_CSRRW,
`INST_SFU_CSRRS,
`INST_SFU_CSRRC: sfu_type = `SFU_CSRS;
default: sfu_type = `SFU_WCTL;
endcase
end
always @(*) begin
perf_issue_units_per_cycle[i] = '0;
perf_issue_sfu_per_cycle[i] = '0;
if (ibuffer_if[i].valid) begin
if (inuse_rd) begin
perf_issue_uses_per_cycle[i][inuse_units[ibuffer_if[i].data.wis][ibuffer_if[i].data.rd]] = 1;
perf_issue_units_per_cycle[i][inuse_units[ibuffer_if[i].data.wis][ibuffer_if[i].data.rd]] = 1;
if (inuse_units[ibuffer_if[i].data.wis][ibuffer_if[i].data.rd] == `EX_SFU) begin
perf_issue_sfu_per_cycle[i][inuse_sfu[ibuffer_if[i].data.wis][ibuffer_if[i].data.rd]] = 1;
end
end
if (inuse_rs1) begin
perf_issue_uses_per_cycle[i][inuse_units[ibuffer_if[i].data.wis][ibuffer_if[i].data.rs1]] = 1;
perf_issue_units_per_cycle[i][inuse_units[ibuffer_if[i].data.wis][ibuffer_if[i].data.rs1]] = 1;
if (inuse_units[ibuffer_if[i].data.wis][ibuffer_if[i].data.rs1] == `EX_SFU) begin
perf_issue_sfu_per_cycle[i][inuse_sfu[ibuffer_if[i].data.wis][ibuffer_if[i].data.rs1]] = 1;
end
end
if (inuse_rs2) begin
perf_issue_uses_per_cycle[i][inuse_units[ibuffer_if[i].data.wis][ibuffer_if[i].data.rs2]] = 1;
perf_issue_units_per_cycle[i][inuse_units[ibuffer_if[i].data.wis][ibuffer_if[i].data.rs2]] = 1;
if (inuse_units[ibuffer_if[i].data.wis][ibuffer_if[i].data.rs2] == `EX_SFU) begin
perf_issue_sfu_per_cycle[i][inuse_sfu[ibuffer_if[i].data.wis][ibuffer_if[i].data.rs2]] = 1;
end
end
if (inuse_rs3) begin
perf_issue_uses_per_cycle[i][inuse_units[ibuffer_if[i].data.wis][ibuffer_if[i].data.rs3]] = 1;
perf_issue_units_per_cycle[i][inuse_units[ibuffer_if[i].data.wis][ibuffer_if[i].data.rs3]] = 1;
if (inuse_units[ibuffer_if[i].data.wis][ibuffer_if[i].data.rs3] == `EX_SFU) begin
perf_issue_sfu_per_cycle[i][inuse_sfu[ibuffer_if[i].data.wis][ibuffer_if[i].data.rs3]] = 1;
end
end
end
end
@@ -97,8 +168,8 @@ module VX_scoreboard import VX_gpu_pkg::*; #(
always @(posedge clk) begin
if (reset) begin
valid_out_r <= 0;
inuse_regs <= '0;
end else begin
inuse_regs <= '0;
end else begin
if (writeback_fire) begin
inuse_regs[writeback_if[i].data.wis][writeback_if[i].data.rd] <= 0;
end
@@ -109,6 +180,9 @@ module VX_scoreboard import VX_gpu_pkg::*; #(
inuse_regs[scoreboard_if[i].data.wis][scoreboard_if[i].data.rd] <= 1;
`ifdef PERF_ENABLE
inuse_units[scoreboard_if[i].data.wis][scoreboard_if[i].data.rd] <= scoreboard_if[i].data.ex_type;
if (scoreboard_if[i].data.ex_type == `EX_SFU) begin
inuse_sfu[scoreboard_if[i].data.wis][scoreboard_if[i].data.rd] <= sfu_type;
end
`endif
end
valid_out_r <= 0;
@@ -141,7 +215,7 @@ module VX_scoreboard import VX_gpu_pkg::*; #(
timeout_ctr <= '0;
end
end
end
end
`RUNTIME_ASSERT((timeout_ctr < `STALL_TIMEOUT),
("%t: *** core%0d-scoreboard-timeout: wid=%0d, PC=0x%0h, tmask=%b, cycles=%0d, inuse=%b (#%0d)",
@@ -153,32 +227,6 @@ module VX_scoreboard import VX_gpu_pkg::*; #(
$time, CORE_ID, wis_to_wid(writeback_if[i].data.wis, i), writeback_if[i].data.PC, writeback_if[i].data.tmask, writeback_if[i].data.rd, writeback_if[i].data.uuid));
`endif
end
`ifdef PERF_ENABLE
wire [`CLOG2(`ISSUE_WIDTH+1)-1:0] perf_stalls_per_cycle_r;
wire [`NUM_EX_UNITS-1:0] perf_uses_per_cycle_r;
`BUFFER(perf_stalls_per_cycle_r, perf_stalls_per_cycle);
`BUFFER(perf_uses_per_cycle_r, perf_uses_per_cycle);
always @(posedge clk) begin
if (reset) begin
perf_scb_stalls <= '0;
end else begin
perf_scb_stalls <= perf_scb_stalls + `PERF_CTR_BITS'(perf_stalls_per_cycle_r);
end
end
for (genvar i = 0; i < `NUM_EX_UNITS; ++i) begin
always @(posedge clk) begin
if (reset) begin
perf_scb_uses[i] <= '0;
end else begin
perf_scb_uses[i] <= perf_scb_uses[i] + `PERF_CTR_BITS'(perf_uses_per_cycle_r[i]);
end
end
end
`endif
endmodule