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Support for more realistic MemTracer step2 (DONE), make Verilog Blackbox DPI output data immediately and make .cc file maintain pointer when downstream is not ready

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This commit is contained in:
Vamber Yang
2023-05-02 22:06:16 -07:00
parent be0fcbd23b
commit 8ccaf3864d
4 changed files with 86 additions and 55 deletions
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43
src/main/resources/csrc/SimMemTrace.cc
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@@ -64,7 +64,8 @@ void MemTraceReader::parse() {
// given SIMD lane (= "thread"). In case no request happened at that point,
// return an empty line with .valid = false.
MemTraceLine MemTraceReader::read_trace_at(const long cycle,
const int lane_id) {
const int lane_id,
unsigned char trace_read_ready) {
MemTraceLine line;
line.valid = false;
@@ -79,7 +80,9 @@ MemTraceLine MemTraceReader::read_trace_at(const long cycle,
// the next line is in the future.
if (line.cycle < cycle) {
// fprintf(stderr, "line.cycle=%ld, cycle=%ld\n", line.cycle, cycle);
printf("cycle=%ld, some lines are left in past Fatal", cycle);
assert(false && "some trace lines are left unread in the past");
return MemTraceLine{};
}
if (line.lane_id != lane_id) {
@@ -90,22 +93,29 @@ MemTraceLine MemTraceReader::read_trace_at(const long cycle,
// read it right now.
return MemTraceLine{};
} else if (line.cycle == cycle && line.lane_id == lane_id) {
printf("fire! cycle=%ld, valid=%d, %s addr=%lx, size=%d \n", cycle,
line.valid, (line.is_store ? "STORE" : "LOAD"), line.address,
line.log_data_size);
// FIXME! Currently lane_id is assumed to be in round-robin order, e.g.
// 0->1->2->3->0->..., both in the trace file and the order the caller calls
// this function. If this is not true, we cannot simply monotonically
// increment read_pos.
if (trace_read_ready){
printf("Fire! cycle=%ld, valid=%d, %s addr=%lx, size=%d \n", cycle,
line.valid, (line.is_store ? "STORE" : "LOAD"), line.address,
line.log_data_size);
// Only advance pointer when cycle and threa_id both match
// now increaseing sequence is fine (0, 1, 3), but unordered is not fine (0, 3, 1)
++read_pos;
// FIXME! Currently lane_id is assumed to be in round-robin order, e.g.
// 0->1->2->3->0->..., both in the trace file and the order the caller calls
// this function. If this is not true, we cannot simply monotonically
// increment read_pos.
// Only advance pointer when cycle and threa_id both match
// now increaseing sequence is fine (0, 1, 3), but unordered is not fine (0, 3, 1)
++read_pos;
}
else { // we do not want to advance read_pos
printf("All Lanes Blocked on this cycle! cycle=%ld \n", cycle);
}
return line;
}
}
return line;
}
extern "C" void memtrace_init(const char *filename) {
#ifndef NO_VPI
@@ -145,11 +155,14 @@ extern "C" void memtrace_query(unsigned char trace_read_ready,
// printf("memtrace_query(cycle=%ld, tid=%d)\n", trace_read_cycle,
// trace_read_lane_id);
/* we can't return immediately, even if trace is ready, we still want to find out
if we are suppose to generate valid req on this clock cycle
if (!trace_read_ready) {
return;
}
*/
auto line = reader->read_trace_at(trace_read_cycle, trace_read_lane_id);
auto line = reader->read_trace_at(trace_read_cycle, trace_read_lane_id, trace_read_ready);
*trace_read_valid = line.valid;
*trace_read_address = line.address;
*trace_read_is_store = line.is_store;