UVM error while running the reset sequence

UVM
, ,
1

HI ,

While running the reset sequence , i am facing uvm error.

Error::
The task responsible for requesting a wait_for_grant on sequencer ‘uvm_test_top.SysEnv.AHBAgent.ahbSqr0’ for sequence ‘uvm_test_top.SysEnv.Agent.ahbSqr0.ahbSeqRdRegular’ has been killed, to avoid a deadlock the sequence will be removed from the arbitration queue.

please help me find any issue with sequence body. Note:: i have pasted the body of the sequence, please ignore any macros or defines.

// ---------------------------------------------------------------------------
// body()
// ---------------------------------------------------------------------------
task cTestResetSeq::body();
  string myname = "cTestResetSeq";

  `cri_uvm_info(1, $sformatf("[%0s] -------------------------------------------- ", myname))
  `cri_uvm_info(1, $sformatf("[%0s] ------- Starting cTestResetSeq ------- ", myname))
  `cri_uvm_info(1, $sformatf("[%0s] -------------------------------------------- ", myname))

  foreach (StatesToReset[ii]) begin

    BasicTestSeq = null;
    ErrWrongCipherSeq = null;

    fork
      begin : Seq1
        if (StatesToReset[ii] == STATUS_ERROR) begin
          // we have to call a sequence that exercises error
          `uvm_create(ErrWrongCipherSeq)
          `cri_randomize(ErrWrongCipherSeq, with {
            BusPriv   == local::BusPriv;
            BusMaster == local::BusMaster;})
          `cri_uvm_info(`DEBUG_LOW, $sformatf("[%0s] Calling a new error sequence.", myname))
          `uvm_send(ErrWrongCipherSeq)
        end
        else begin
          assert(ShaOperation.randomize() with {
            Command != CONTROL_COMMAND_KEY;});

          `uvm_create(BasicTestSeq)
          `cri_randomize(BasicTestSeq, with {
            BusPriv         == local::BusPriv;
            BusMaster       == local::BusMaster;
            Command         == ShaOperation.Command;
            CipherOp        == ShaOperation.Cipher;
            NumKeys         == 1;
            NumRequests == 2;})
          `cri_uvm_info(`DEBUG_LOW, $sformatf("[%0s] Calling a new test sequence.", myname))
          `uvm_send(BasicTestSeq)
        end
      end
      begin : resetSeq
        automatic int timeout = 0;

        `cri_uvm_info(`DEBUG_LOW, $sformatf("[%0s] Waiting for state %s to reset core",
          myname, fStatusStr(StatesToReset[ii])))

        if ($test$plusargs("TEST_SEQ1")) begin
          while (MainInf.StatusReg[STATUS_REG_Status_SRANGE] !== StatesToReset[ii]) begin
            @(negedge MainInf.clk);

            timeout++;
            if (timeout == 10000) begin
              `cri_uvm_fatal(this.get_name(), $sformatf("State %s never happened in 10000 cycles.",
                fStatusStr(StatesToReset[ii])))
            end
          end
        end
        else begin
          while (MainInf.StatusReg[STATUS_REG_Status_SRANGE] !== StatesToReset[ii]) begin
            @(negedge MainInf.clk);

            timeout++;
            if (timeout == 10000) begin
              `cri_uvm_fatal(this.get_name(), $sformatf("State %s never happened in 10000 cycles.",
                fStatusStr(StatesToReset[ii])))
            end
          end
        end

        `cri_uvm_info(`DEBUG_LOW, $sformatf("[%0s] Core will be reset during %s state.",
          myname, fStatusStr(StatesToReset[ii])))
        SysEnv.ResetInjector.tApplyReset();

        super.tSetupIPa();

        // stop concurrent thread
        disable Seq1;

        if (StatesToReset[ii] == STATUS_ERROR) begin
          // Kill ErrWrongCipherSeq
          while (ErrWrongCipherSeq == null) begin
            @(negedge MainInf.clk);
          end
          ErrWrongCipherSeq.kill();
        end
        else begin
          // Kill BasicTestSeq
          while (BasicTestSeq == null) begin
            @(negedge MainInf.clk);
          end
          BasicTestSeq.kill();
        end
      end
    join

    // Wait for reset to finish
    repeat(50) @(negedge MainInf.clk);

    // Poll for STATUS_AVAILABLE
    `uvm_create(PollSeq)
    `cri_randomize(PollSeq, with {
      BusPriv           == local::BusPriv;
      BusMaster         == local::BusMaster;
      RegAddr           == StatusReg.addr;
      ExpectedReadData  == STATUS_AVAILABLE;
      Mask              == 32'hff;})
    `cri_uvm_info(`DEBUG_LOW, $sformatf("[%0s] After reset, poll for status AVAILABLE.", myname))
    `uvm_send(PollSeq)

    wait fork;
  end

  `cri_uvm_info(1, $sformatf("[%0s] --------------------------------------------- ", myname))
  `cri_uvm_info(1, $sformatf("[%0s] ------- Done cTestResetSeq ------------ ", myname))
  `cri_uvm_info(1, $sformatf("[%0s] --------------------------------------------- ", myname))
endtask : body
2

In reply to syed taahir ahmed:

In your sequence code you rae violating 2 kex rules:
(1) You are killing a sequence. In most cases this results in trouble.
(2) You are synchronizing the execution on clk edges. Also this makes trouble.

A 3rd spect seems to be the usage of a specific test name. In the sequence execution.
You see it in your error message.
You should clean-up your code and you’ll see it works.