tpoikela / uvm-python Goto Github PK

Hi, I ve just installed UVM-python and I was trying the example in

uvm-python/test/examples/integrated/ubus/examples

with

make

it reaches the end and passes and says "UVM_ERROR: 0" and also "UVM_FATAL: 0"

but trying to add constraints in the uvm_do_with sequences in

uvm-python/test/examples/integrated/ubus/examples/ubus_example_master_seq_lib.py

does not lead to them being taken into account..

I have made some (not impressive) progresses if I do what I show in the attached .py python files but nevertheless I get the results also attached here as .vcd file, i.e. I obtain to write at the same address that I read in the 1st step and really to write the "read data plus 1" but then on the 2nd read (which is the 3rd operation, after the "WRITE" of "read modify write".... I get from this address completely unrelated [data...](url
ubus_master_seq_lib.py.txt
ubus_transfer.py.txt
ubus_example_master_seq_lib.py.txt

)

may be I am doing something stupid or is this not yet supported completely ?
thx a lot!

after installed as a package, and runing minimal working example,
there is a problem:
Failed to import module new_test: No module named 'uvm'

what can i do to solve this problem.

Errors I see is with icarus, but vcs seems to be working fine. Any ideas?
...
-.--ns INFO gpi ..mbed/gpi_embed.cpp:105 in set_program_name_in_venv Using Python virtual environment interpreter at ./venv/bin/python
-.--ns INFO gpi ../gpi/GpiCommon.cpp:101 in gpi_print_registered_impl VPI registered
: Unable to open input file.

Is there an example that shows parameterized UVM components and objects? Thanks.

when I run minimal test I got type error
python 3.7.6
cocotb 1.3.1
info
Did you forget use @cocotb.coroutine decorator? uvm run_test() location.
Was there something I did wrong.

I've been starting to use my register model and have been confused at why I can't trigger an error on reg.mirror(). It looks like there's another typo in uvm_reg_field.py where the initial value of m_check is set to UVM_NO_CHECK instead of UVM_CHECK.

In the SV version, the configure method checks if the field is volatile or not and sets the check field appropriately:

   function void uvm_reg_field::configure(uvm_reg        parent,
                                          int unsigned   size,
                                          int unsigned   lsb_pos,
                                          string         access,
                                          bit            volatile,
                                          uvm_reg_data_t reset,
                                          bit            has_reset,
                                          bit            is_rand,
                                          bit            individually_accessible); 
      m_parent = parent;
      if (size == 0) begin
         `uvm_error("RegModel",
            $sformatf("Field \"%s\" cannot have 0 bits", get_full_name()));
         size = 1;
      end
   
      m_size      = size;
      m_volatile  = volatile;
      m_access    = access.toupper();
      m_lsb       = lsb_pos;
      m_cover_on  = UVM_NO_COVERAGE;
      m_written   = 0;
      m_check     = volatile ? UVM_NO_CHECK : UVM_CHECK;

In uvm_reg_field.py, the variable is set in the __init__() method to UVM_NO_CHECK and then in configure() method, if it's volatile, the same value is written. I think the initial value should be changed to:

   def __init__(self, name='uvm_reg_field'):
        """
        This method should not be used directly.
        The `UVMRegField.type_id.create()` factory method
        should be used instead.

        Args:
            name: (str): Name of the register field
        """
        UVMObject.__init__(self, name)
        self.value = 0  # Mirrored after randomize()
        self.m_mirrored = 0  # What we think is in the HW
        self.m_desired = 0  # Mirrored after set()
        self.m_access = ""
        self.m_parent = None  # uvm_reg
        self.m_lsb = 0
        self.m_size = 0
        self.m_volatile = False
        self.m_reset = {}  # string -> uvm_reg_data_t
        self.m_written = False
        self.m_read_in_progress = False
        self.m_write_in_progress = False
        self.m_fname = ""
        self.m_lineno = 0
        self.m_cover_on = 0
        self.m_individually_accessible = False
        self.m_check = UVM_CHECK  # uvm_check_e

and then the configure() method doesn't need to change (although removing the else case would be a positive):

   def configure(self, parent, size, lsb_pos, access, volatile, reset, has_reset, is_rand,
            individually_accessible):
 # ...snip...
        if volatile:
            self.m_check = UVM_NO_CHECK
        else:
            self.m_check = self.m_check

@tpoikela
Can we use this python uvm package to create monitor and from analysis port receive transactions from sv uvm(cross packet transaction between two languages with tlm)?

I can use uvm_do_with but when I try uvm_do it fails with

File "uvm/base/sv.py", line 511, in randomize_with
            raise RandomizeError(
                       uvm.base.uvm_exceptions.RandomizeError: randomize_with() failed for kind=READ addr=C2 data=DEADBEEF [] is not a callable object

I guess the [] that is passed as constraint is the problem

when I try and replaced the [] with lambda: True it works.

@tpoikela, here's an example I've been playing with tonight. I'm just trying to work out how I go about updating the mirrored value with that in the RTL. I've got a simple dut.sv that has an incrementing counter called count_q[31:0] inside a module called regfile. So the hierarchical path is dut.u_reg.count_q.

I hit a few snags along the way getting here, one of which needs a pull request which I'll sort out shortly. But my outstanding question is how am I supposed to get the register model to update the mirrored value of a UVMRegField?

I've not used UVM before so this is perhaps just a methodology question but perhaps I'm just supposed to manually update the value any time the TB logic wants to read the data?

#!/usr/bin/env python3

import sys
import cocotb
from cocotb.triggers import Timer, RisingEdge
from cocotb.clock import Clock
from uvm import UVMRegBlock, UVMReg, UVMRegField, UVMRegItem, uvm_hdl
from uvm.macros import uvm_object_utils
from uvm.reg.uvm_reg_model import *

class Register(UVMReg):
    def __init__(self, name):
        super().__init__(name, 32)

    def build(self):
        self.count = UVMRegField.type_id.create("count")
        self.count.configure(self, 32, 0, "RO", True, 0, True, False, False)
    
uvm_object_utils(Register)

class Regfile(UVMRegBlock):
    def __init__(self, name='regfile'):
        super().__init__(name, UVM_NO_COVERAGE)

    def build(self):
        self.count = Register.type_id.create("count_qs")
        self.count.configure(self, None, "count_q")
        self.count.build()

uvm_object_utils(Regfile)


@cocotb.test()
async def test(dut):
    regfile = Regfile("register_file")
    regfile.add_hdl_path("u_reg")
    regfile.build()

    uvm_hdl.set_dut(dut)

    cocotb.fork(Clock(dut.clk, 5, 'ns').start())
    dut.rst_n <= 1
    await RisingEdge(dut.clk)
    dut.rst_n <= 0
    await RisingEdge(dut.clk)
    dut.rst_n <= 1
    
    await RisingEdge(dut.clk)
    await RisingEdge(dut.clk)
    print(regfile.count.get_mirrored_value())
    
    await Timer(100,'ns')
    await RisingEdge(dut.clk)
    print(int(dut.u_reg.count_q.value))
    print("%s needs_update=%s"%(regfile.count.name, regfile.count.needs_update()))
    
    rw = UVMRegItem.type_id.create("pseudo-read_item", None, "")
    regfile.count.backdoor_read(rw)
    print("backdoor_value=%s"%rw.value[0])
    print("mirrored_value=%s"%regfile.count.get_mirrored_value()) 

prints

backdoor_value=21
mirrored_value=0

I'm trying to run the minimal test which is the example test that comes with the uvm-python package. When I launch the test, it shows this error:

File "/prj/tbs/5g/sandiego/hw/main/users/hctseng/dev5g/prach4/uvm_python/uvm-python-master/test/examples/minimal/uvm/base/uvm_globals.py", line 441, in uvm_is_sim_active return simulator.is_running()
AttributeError: module 'simulator' has no attribute 'is_running'

Any ideas? I'm using QuestaSim version 2020.2.

Thanks,
Richard

Any example that shows integrating C++/SystemC predictor? Thanks.

I am trying to integrate cocotb inside larger build infrastructure. What is the best way to do this? I thought venv might work. Any suggestions? Thanks.

Creating a venv and install UVM-Python package:

python3.10 -m venv …/uvmpy/venv
cd …/uvmpy
git clone https://github.com/tpoikela/uvm-python.git
cd uvm-python
python -m pip install .

I see cocotb-config under ../venv/bin

I run this command in a new terminal and different directory:

source .../uvmpy/venv/bin/activate.csh

which cocotb-config
…/uvmpy/venv/bin/cocotb-config

Then run an example and I get this error:

cp -rf …/uvmpy/uvm-python/test/examples .
cd examples/minimal

(Update Makefile: ../../.. in PYTHONPATH changed to the location of …/uvmpy/uvm-python)

make sim
Traceback (most recent call last):
  File “…/uvmpy/venv/bin/cocotb-config", line 5, in <module>
    from cocotb.config import main
  File "…/uvmpy/venv/lib/python3.10/site-packages/cocotb/__init__.py", line 43, in <module>
    import cocotb.handle
  File "…/uvmpy/venv/lib/python3.10/site-packages/cocotb/handle.py", line 39, in <module>
    from cocotb import simulator
ImportError: cannot import name 'simulator' from partially initialized module 'cocotb' (most likely due to a circular import) (…/uvmpy/venv/lib/python3.10/site-packages/cocotb/__init__.py)

I also sometimes see cocotb-config not found. Is there a way to use cocotb Makefiles without coco-tb-config?

The latest uvm-python depends on cocotb 1.5.0.rc2 which seems to have issues with verilator.

Even trying to set a combination of dependencies that could work seems to hang the simulation process, might be caused by changes in cocotb-bus or cocotb.

How to save uvm_info into a log file，not only into terminal?

I've been using the register model I created and having now added more tests to a single file, I noticed I'm getting warnings that more than one uvm_reg_block have been instanced with the same name.

Am I supposed to be cleaning up each test somehow? Is there a particular helper method I should call?

Cheers.

When running the above-mentioned example, uvm_fatal is thrown. Looks like APB monitor does not register any items during simulation.

Commands to reproduce the issue:

cd test/examples/simple/registers/vertical_reuse
SIM=ghdl make TOPLEVEL_LANG=vhdl IMG=BLK SIMARGS="-- +UVM_TESTNAME=blk_R_test" SIM_BUILD=sim_build_blk

Expected result:
Test passes, and does not throw uvm_fatal.

Using this package all my tests are executing and giving correct result.
But at the end report is failing. There is no log error found

Below is log
1000000.00ns ERROR cocotb.scheduler Failing test at simulator request before test run completion: Simulator shutdown prematurely
1000000.00ns ERROR cocotb.regression Test error has lead to simulator shutting us down

Hello,

I found a bug on uvm_hw_reset_sequence enum is not getting name rightly which is fixed now let me know how can i commit these changes

thanks
SanaUllah

Hello, I encountered a problem when starting the sequence using the default_sequence method. The simulation does not execute the body content of the sequence. After inspection, I found that the code if (sv.cast(sbr, rscr, UVMConfigDb)) in the start_phase_sequence of uvm_sequencer_base.py seems to have some issues. Because the transmitted rsrc is of the UVMResource type, this branch is always judged as False, and the sequence cannot be started. If if (sv.cast(sbr, rscr, UVMConfigDb)) is modified to if (sv.cast(sbr, rscr, UVMResource)), the sequence can be mounted and executed, but the objection cannot be dropped. The error location is in the comp.drop(self, source_obj, description, count) within the dropped function of uvm_objection.py. The error message is that comp has no attribute 'dropped'. The print shows that the type of comp is the self.vseq transmitted by UVMConfigDb.set(self, "top_env.v_sqr.main_phase", "default_sequence", self.vseq ), while when starting using the seq.start method, the type of comp here is uvm_test. I wonder if there is a problem with my usage method, or do you have an example of using default_sequence and uvm_do_on_with to specify the start of sqr? Looking forward to your reply. Thank you very much.

UVMConfigDb：

self.vseq:

top_base_vseq:

error info:

There seems to be a SV-to-Python conversion typo in uvm_reg_map.py where Xget_bus_infoX() is called. The SV version of this method updates the 4 arguments passed in but the Python version returns a list. This list should override the parameters that are passed in. However, n_bits_init is not updated. I'll create a PR for this but I wanted you to look at how the byte_en is updated. It seems to be only set if the element_kind is UVM_FIELD. In the case of UVM_REG, the byte_en is left as -1. Is this intentional? Perhaps in the SV world this is treated as a twos complement number which sets all byte enables to 1?

In all methods that call Xget_bus_infoX, the following

    [map_info, size, lsb, addr_skip] = self.Xget_bus_infoX(rw, map_info, n_bits, lsb, skip)

should be modified to:

    [map_info, n_bits, lsb, skip] = self.Xget_bus_infoX(rw, map_info, n_bits, lsb, skip)

And looking at it, there is a difference between do_bus_write and do_bus_read where n_bits_init and n_bits are used respectively. I'm assuming these should be the same.

I've been browsing the documentation and there are a whole heap of instances where the code formatting has been lost. For example, the code snippet here is rendered as plain text making it difficult to read.

https://uvm-python.readthedocs.io/en/latest/uvm_users_guide_1.2.html#register-types

Hello, when using UVM-SV, sometimes I force a signal in the DUT to maintain a specific value in the sequence, so that it is not affected by the internal logic of the DUT, and then observe the changes in other signals in the DUT. So, is there a similar usage of the 'force' feature in UVM-Python?