// Copyright 2021 ETH Zurich and University of Bologna.
// Solderpad Hardware License, Version 0.51, see LICENSE for details.
// SPDX-License-Identifier: SHL-0.51
module mempool_cc
import snitch_pkg::meta_id_t;
#(
parameter logic [31:0] BootAddr = 32'h0000_1000,
parameter logic [31:0] MTVEC = BootAddr,
parameter bit RVE = 0, // Reduced-register extension
parameter bit RVM = 1, // Enable IntegerMmultiplication & Division Extension
parameter bit RegisterOffloadReq = 1,
parameter bit RegisterOffloadResp = 1,
parameter bit RegisterTCDMReq = 0,
parameter bit RegisterTCDMResp = 0
) (
input logic clk_i,
input logic rst_i,
input logic [31:0] hart_id_i,
// Instruction Port
output logic [31:0] inst_addr_o,
input logic [31:0] inst_data_i,
output logic inst_valid_o,
input logic inst_ready_i,
// TCDM Ports
output logic [31:0] data_qaddr_o,
output logic data_qwrite_o,
output logic [3:0] data_qamo_o,
output logic [31:0] data_qdata_o,
output logic [3:0] data_qstrb_o,
output meta_id_t data_qid_o,
output logic data_qvalid_o,
input logic data_qready_i,
input logic [31:0] data_pdata_i,
input logic data_perror_i,
input meta_id_t data_pid_i,
input logic data_pvalid_i,
output logic data_pready_o,
input logic wake_up_sync_i,
// Core event strobes
output snitch_pkg::core_events_t core_events_o
);
// Data port signals
snitch_pkg::dreq_t data_req_d, data_req_q;
snitch_pkg::dresp_t data_resp_d, data_resp_q;
logic data_req_d_valid, data_req_d_ready, data_resp_d_valid, data_resp_d_ready;
logic data_req_q_valid, data_req_q_ready, data_resp_q_valid, data_resp_q_ready;
// Accelerator signals
snitch_pkg::acc_req_t acc_req_d, acc_req_q;
snitch_pkg::acc_resp_t acc_resp_d, acc_resp_q;
logic acc_req_d_valid, acc_req_d_ready, acc_resp_d_valid, acc_resp_d_ready;
logic acc_req_q_valid, acc_req_q_ready, acc_resp_q_valid, acc_resp_q_ready;
// Snitch Integer Core
snitch #(
.BootAddr ( BootAddr ),
.MTVEC ( MTVEC ),
.RVE ( RVE ),
.RVM ( RVM )
) i_snitch (
.clk_i ,
.rst_i ,
.hart_id_i ,
.inst_addr_o ,
.inst_data_i ,
.inst_valid_o ,
.inst_ready_i ,
.acc_qaddr_o ( acc_req_d.addr ),
.acc_qid_o ( acc_req_d.id ),
.acc_qdata_op_o ( acc_req_d.data_op ),
.acc_qdata_arga_o ( acc_req_d.data_arga ),
.acc_qdata_argb_o ( acc_req_d.data_argb ),
.acc_qdata_argc_o ( acc_req_d.data_argc ),
.acc_qvalid_o ( acc_req_d_valid ),
.acc_qready_i ( acc_req_d_ready ),
.acc_pdata_i ( acc_resp_q.data ),
.acc_pid_i ( acc_resp_q.id ),
.acc_perror_i ( acc_resp_q.error ),
.acc_pvalid_i ( acc_resp_q_valid ),
.acc_pready_o ( acc_resp_q_ready ),
.data_qaddr_o ( data_req_d.addr ),
.data_qwrite_o ( data_req_d.write ),
.data_qamo_o ( data_req_d.amo ),
.data_qdata_o ( data_req_d.data ),
.data_qstrb_o ( data_req_d.strb ),
.data_qid_o ( data_req_d.id ),
.data_qvalid_o ( data_req_d_valid ),
.data_qready_i ( data_req_d_ready ),
.data_pdata_i ( data_resp_q.data ),
.data_perror_i ( data_resp_q.error ),
.data_pid_i ( data_resp_q.id ),
.data_pvalid_i ( data_resp_q_valid ),
.data_pready_o ( data_resp_q_ready ),
.wake_up_sync_i ( wake_up_sync_i ),
.core_events_o ( core_events_o )
);
// Cut off-loading request path
spill_register #(
.T ( snitch_pkg::acc_req_t ),
.Bypass ( !RegisterOffloadReq )
) i_spill_register_acc_req (
.clk_i ,
.rst_ni ( ~rst_i ),
.valid_i ( acc_req_d_valid ),
.ready_o ( acc_req_d_ready ),
.data_i ( acc_req_d ),
.valid_o ( acc_req_q_valid ),
.ready_i ( acc_req_q_ready ),
.data_o ( acc_req_q )
);
// Cut off-loading response path
spill_register #(
.T ( snitch_pkg::acc_resp_t ),
.Bypass ( !RegisterOffloadResp )
) i_spill_register_acc_resp (
.clk_i ,
.rst_ni ( ~rst_i ),
.valid_i ( acc_resp_d_valid ),
.ready_o ( acc_resp_d_ready ),
.data_i ( acc_resp_d ),
.valid_o ( acc_resp_q_valid ),
.ready_i ( acc_resp_q_ready ),
.data_o ( acc_resp_q )
);
// Snitch IPU accelerator
snitch_ipu #(
.IdWidth ( 5 )
) i_snitch_ipu (
.clk_i ,
.rst_i ,
.acc_qaddr_i ( acc_req_q.addr ),
.acc_qid_i ( acc_req_q.id ),
.acc_qdata_op_i ( acc_req_q.data_op ),
.acc_qdata_arga_i ( acc_req_q.data_arga ),
.acc_qdata_argb_i ( acc_req_q.data_argb ),
.acc_qdata_argc_i ( acc_req_q.data_argc ),
.acc_qvalid_i ( acc_req_q_valid ),
.acc_qready_o ( acc_req_q_ready ),
.acc_pdata_o ( acc_resp_d.data ),
.acc_pid_o ( acc_resp_d.id ),
.acc_perror_o ( acc_resp_d.error ),
.acc_pvalid_o ( acc_resp_d_valid ),
.acc_pready_i ( acc_resp_d_ready )
);
// Cut TCDM data request path
spill_register #(
.T ( snitch_pkg::dreq_t ),
.Bypass ( !RegisterTCDMReq )
) i_spill_register_tcdm_req (
.clk_i ,
.rst_ni ( ~rst_i ),
.valid_i ( data_req_d_valid ),
.ready_o ( data_req_d_ready ),
.data_i ( data_req_d ),
.valid_o ( data_req_q_valid ),
.ready_i ( data_req_q_ready ),
.data_o ( data_req_q )
);
// Cut TCDM data response path
spill_register #(
.T ( snitch_pkg::dresp_t ),
.Bypass ( !RegisterTCDMResp )
) i_spill_register_tcdm_resp (
.clk_i ,
.rst_ni ( ~rst_i ),
.valid_i ( data_resp_d_valid ),
.ready_o ( data_resp_d_ready ),
.data_i ( data_resp_d ),
.valid_o ( data_resp_q_valid ),
.ready_i ( data_resp_q_ready ),
.data_o ( data_resp_q )
);
// Assign TCDM data interface
assign data_qaddr_o = data_req_q.addr;
assign data_qwrite_o = data_req_q.write;
assign data_qamo_o = data_req_q.amo;
assign data_qdata_o = data_req_q.data;
assign data_qstrb_o = data_req_q.strb;
assign data_qid_o = data_req_q.id;
assign data_qvalid_o = data_req_q_valid;
assign data_req_q_ready = data_qready_i;
assign data_resp_d.data = data_pdata_i;
assign data_resp_d.id = data_pid_i;
assign data_resp_d.write = 'x; // Don't care here
assign data_resp_d.error = data_perror_i;
assign data_resp_d_valid = data_pvalid_i;
assign data_pready_o = data_resp_d_ready;
// --------------------------
// Tracer
// --------------------------
// pragma translate_off
int f;
string fn;
logic [63:0] cycle;
int unsigned stall, stall_ins, stall_raw, stall_lsu, stall_acc;
always_ff @(posedge rst_i) begin
if(rst_i) begin
// Format in hex because vcs and vsim treat decimal differently
// Format with 8 digits because Verilator does not support anything else
$sformat(fn, "trace_hart_0x%08x.dasm", hart_id_i);
f = $fopen(fn, "w");
$display("[Tracer] Logging Hart %d to %s", hart_id_i, fn);
end
end
typedef enum logic [1:0] {SrcSnitch = 0, SrcFpu = 1, SrcFpuSeq = 2} trace_src_e;
localparam int SnitchTrace = `ifdef SNITCH_TRACE `SNITCH_TRACE `else 0 `endif;
always_ff @(posedge clk_i or posedge rst_i) begin
automatic string trace_entry;
automatic string extras_str;
if (!rst_i) begin
cycle <= cycle + 1;
// Trace snitch iff:
// Tracing enabled by CSR register
// we are not stalled <==> we have issued and processed an instruction (including offloads)
// OR we are retiring (issuing a writeback from) a load or accelerator instruction
if ((i_snitch.csr_trace_q || SnitchTrace) && (!i_snitch.stall || i_snitch.retire_load || i_snitch.retire_acc)) begin
// Manual loop unrolling for Verilator
// Data type keys for arrays are currently not supported in Verilator
extras_str = "{";
// State
extras_str = $sformatf("%s'%s': 0x%8x, ", extras_str, "source", SrcSnitch);
extras_str = $sformatf("%s'%s': 0x%8x, ", extras_str, "stall", i_snitch.stall);
extras_str = $sformatf("%s'%s': 0x%8x, ", extras_str, "stall_tot", stall);
extras_str = $sformatf("%s'%s': 0x%8x, ", extras_str, "stall_ins", stall_ins);
extras_str = $sformatf("%s'%s': 0x%8x, ", extras_str, "stall_raw", stall_raw);
extras_str = $sformatf("%s'%s': 0x%8x, ", extras_str, "stall_lsu", stall_lsu);
extras_str = $sformatf("%s'%s': 0x%8x, ", extras_str, "stall_acc", stall_acc);
// Decoding
extras_str = $sformatf("%s'%s': 0x%8x, ", extras_str, "rs1", i_snitch.rs1);
extras_str = $sformatf("%s'%s': 0x%8x, ", extras_str, "rs2", i_snitch.rs2);
extras_str = $sformatf("%s'%s': 0x%8x, ", extras_str, "rd", i_snitch.rd);
extras_str = $sformatf("%s'%s': 0x%8x, ", extras_str, "is_load", i_snitch.is_load);
extras_str = $sformatf("%s'%s': 0x%8x, ", extras_str, "is_store", i_snitch.is_store);
extras_str = $sformatf("%s'%s': 0x%8x, ", extras_str, "is_branch", i_snitch.is_branch);
extras_str = $sformatf("%s'%s': 0x%8x, ", extras_str, "pc_d", i_snitch.pc_d);
// Operands
extras_str = $sformatf("%s'%s': 0x%8x, ", extras_str, "opa", i_snitch.opa);
extras_str = $sformatf("%s'%s': 0x%8x, ", extras_str, "opb", i_snitch.opb);
extras_str = $sformatf("%s'%s': 0x%8x, ", extras_str, "opa_select", i_snitch.opa_select);
extras_str = $sformatf("%s'%s': 0x%8x, ", extras_str, "opb_select", i_snitch.opb_select);
extras_str = $sformatf("%s'%s': 0x%8x, ", extras_str, "opc_select", i_snitch.opc_select);
extras_str = $sformatf("%s'%s': 0x%8x, ", extras_str, "write_rd", i_snitch.write_rd);
extras_str = $sformatf("%s'%s': 0x%8x, ", extras_str, "csr_addr", i_snitch.inst_data_i[31:20]);
// Pipeline writeback
extras_str = $sformatf("%s'%s': 0x%8x, ", extras_str, "writeback", i_snitch.alu_writeback);
// Load/Store
extras_str = $sformatf("%s'%s': 0x%8x, ", extras_str, "gpr_rdata_1", i_snitch.gpr_rdata[1]);
extras_str = $sformatf("%s'%s': 0x%8x, ", extras_str, "gpr_rdata_2", i_snitch.gpr_rdata[2]);
extras_str = $sformatf("%s'%s': 0x%8x, ", extras_str, "ls_size", i_snitch.ls_size);
extras_str = $sformatf("%s'%s': 0x%8x, ", extras_str, "ld_result_32",i_snitch.ld_result[31:0]);
extras_str = $sformatf("%s'%s': 0x%8x, ", extras_str, "lsu_rd", i_snitch.lsu_rd);
extras_str = $sformatf("%s'%s': 0x%8x, ", extras_str, "retire_load", i_snitch.retire_load);
extras_str = $sformatf("%s'%s': 0x%8x, ", extras_str, "alu_result", i_snitch.alu_result);
// Atomics
extras_str = $sformatf("%s'%s': 0x%8x, ", extras_str, "ls_amo", i_snitch.ls_amo);
// Accumulator
extras_str = $sformatf("%s'%s': 0x%8x, ", extras_str, "retire_acc", i_snitch.retire_acc);
extras_str = $sformatf("%s'%s': 0x%8x, ", extras_str, "acc_pid", i_snitch.acc_pid_i);
extras_str = $sformatf("%s'%s': 0x%8x, ", extras_str, "acc_pdata_32",i_snitch.acc_pdata_i[31:0]);
// FPU offload
extras_str = $sformatf("%s'%s': 0x%8x, ", extras_str, "fpu_offload", 1'b0);
extras_str = $sformatf("%s'%s': 0x%8x, ", extras_str, "is_seq_insn", 1'b0);
extras_str = $sformatf("%s}", extras_str);
$sformat(trace_entry, "%t %8d 0x%h DASM(%h) #; %s\n",
$time, cycle, i_snitch.pc_q, i_snitch.inst_data_i, extras_str);
$fwrite(f, trace_entry);
end
// Reset all stalls when we execute an instruction
if (!i_snitch.stall) begin
stall <= 0;
stall_ins <= 0;
stall_raw <= 0;
stall_lsu <= 0;
stall_acc <= 0;
end else begin
// We are currently stalled, let's count the stall causes
if (i_snitch.stall) begin
stall <= stall + 1;
end
if ((!i_snitch.inst_ready_i) && (i_snitch.inst_valid_o)) begin
stall_ins <= stall_ins + 1;
end
if ((!i_snitch.operands_ready) || (!i_snitch.dst_ready)) begin
stall_raw <= stall_raw + 1;
end
if (i_snitch.lsu_stall) begin
stall_lsu <= stall_lsu + 1;
end
if (i_snitch.acc_stall) begin
stall_acc <= stall_acc + 1;
end
end
end else begin
cycle <= '0;
stall <= 0;
stall_ins <= 0;
stall_raw <= 0;
stall_lsu <= 0;
stall_acc <= 0;
end
end
final begin
$fclose(f);
end
// pragma translate_on
endmodule