protected bool is_row_hit(Req req)
{
return(meta_mctrl.is_row_hit(req));
}
private Req __find_best_req(int r, int b)
{
//no need to search for request, already outstanding commands
if (cmdqs[r, b].Count > 0)
{
return(null);
}
/*** find best request ***/
List <Req> rq = readqs[r, b];
List <Req> wq = writeqs[r, b];
if (rq.Count == 0 && wq.Count == 0)
{
return(null);
}
Req best_req = null;
Cmd cmd = null;
//find best writeback request
if (wb_mode)
{
best_req = meta_mctrl.find_best_wb_req(wq);
if (best_req != null)
{
//check if best writeback request is schedulable
cmd = decode_req(best_req)[0];
if (!can_schedule_cmd(cmd))
{
return(null);
}
return(best_req);
}
//writeq is empty: should we let reads bypass?
if (!Config.mctrl.read_bypass)
{
return(null);
}
}
//find best read request
best_req = meta_mctrl.find_best_rd_req(rq);
/*** row-hit bypass ***/
if (Config.mctrl.row_hit_bypass)
{
Req hit_req = rh_finder.find_best_req(rq);
if (!meta_mctrl.is_row_hit(best_req) && hit_req != null)
{
Bank2 bank = chan.ranks[r].banks[b];
Dbg.Assert(bank.ts_act != -1);
long ts_pre = bank.ts_act + timing.tRAS;
long speculative_ts_pre = cycles + timing.tRTP;
if (speculative_ts_pre <= ts_pre)
{
best_req = hit_req;
}
}
}
if (best_req == null)
{
return(null);
}
//check if best request is schedulable
cmd = decode_req(best_req)[0];
if (!can_schedule_cmd(cmd))
{
return(null);
}
return(best_req);
}
