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fixed snoop forwarder dequue to support out of order responses

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This commit is contained in:
Blaise Tine
2020-05-23 20:19:54 -04:00
parent 9398c07afb
commit c54fa50715
4 changed files with 3637 additions and 98765 deletions
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5
hw/rtl/cache/VX_snp_forwarder.v vendored
View File

@@ -38,7 +38,7 @@ module VX_snp_forwarder #(
reg [`LOG2UP(SNRQ_SIZE)-1:0] rd_ptr, wr_ptr;
reg [`LOG2UP(SNRQ_SIZE)-1:0] pending_size;
reg [`REQS_BITS-1:0] fwdin_sel;
wire enqueue, dequeue;
wire enqueue, dequeue, empty;
wire fwdout_ready;
@@ -67,8 +67,9 @@ module VX_snp_forwarder #(
assign snp_rsp_valid = fwdin_taken && (1 == pending_cntrs[fwdin_tag]); // send response
assign {snp_rsp_addr, snp_rsp_tag} = pending_reqs[fwdin_tag];
assign empty = (wr_ptr == rd_ptr);
assign enqueue = snp_req_valid && snp_req_ready;
assign dequeue = snp_rsp_valid && (rd_ptr == fwdin_tag);
assign dequeue = !empty && (0 == pending_cntrs[rd_ptr]);
always @(posedge clk) begin
if (reset) begin

8
hw/simulate/simulator.cpp
View File

@@ -195,14 +195,18 @@ void Simulator::flush_caches(uint32_t mem_addr, uint32_t size) {
if (vortex_->snp_rsp_valid) {
assert(pending_snp_reqs > 0);
--pending_snp_reqs;
//std::cout << timestamp << ": [sim] snp rsp: tag=" << vortex_->snp_rsp_tag << " pending=" << pending_snp_reqs << std::endl;
#ifdef DBG_PRINT_CACHE_SNP
std::cout << timestamp << ": [sim] snp rsp: tag=" << vortex_->snp_rsp_tag << " pending=" << pending_snp_reqs << std::endl;
#endif
}
if (vortex_->snp_req_valid && vortex_->snp_req_ready) {
if (vortex_->snp_req_addr < aligned_addr_end) {
vortex_->snp_req_addr += 1;
vortex_->snp_req_tag += 1;
++pending_snp_reqs;
//std::cout << timestamp << ": [sim] snp req: addr=" << vortex_->snp_req_addr << " tag=" << vortex_->snp_req_tag << " remain=" << (aligned_addr_end - vortex_->snp_req_addr) << std::endl;
#ifdef DBG_PRINT_CACHE_SNP
std::cout << timestamp << ": [sim] snp req: addr=" << vortex_->snp_req_addr << " tag=" << vortex_->snp_req_tag << " remain=" << (aligned_addr_end - vortex_->snp_req_addr) << std::endl;
#endif
} else {
vortex_->snp_req_valid = 0;
}