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OVM REPORTING



The ovm_report_object provides an interface to the OVM reporting facility. Through this interface, components issue the various messages with different severity levels that occur during simulation. Users can configure what actions are taken and what file(s) are output for individual messages from a particular component or for all messages from all components in the environment.

A report consists of an id string, severity, verbosity level, and the textual message itself. If the verbosity level of a report is greater than the configured maximum verbosity level of its report object, it is ignored.


Reporting Methods:



Following are the primary reporting methods in the OVM.


virtual function void ovm_report_info
(string id,string message,int verbosity=OVM_MEDIUM,string filename="",int line=0)

virtual function void ovm_report_warning
(string id,string message,int verbosity=OVM_MEDIUM,string filename="",int line=0)

virtual function void ovm_report_error
(string id,string message,int verbosity=OVM_LOW, string filename="",int line=0)

virtual function void ovm_report_fatal
(string id,string message,int verbosity=OVM_NONE, string filename="",int line=0)

(S)Arguments description:


id -- a unique id to form a group of messages.

message -- The message text

verbosity -- the verbosity of the message, indicating its relative importance. If this number is less than or equal to the effective verbosity level, then the report is issued, subject to the configured action and file descriptor settings.

filename/line -- If required to print filename and line number from where the message is issued, use macros, `__FILE__ and `__LINE__.



Actions:



These methods associate the specified action or actions with reports of the givenseverity, id, or severity-id pair.

Following are the actions defined:

OVM_NO_ACTION -- Do nothing
OVM_DISPLAY -- Display report to standard output
OVM_LOG -- Write to a file
OVM_COUNT -- Count up to a max_quit_count value before exiting
OVM_EXIT -- Terminates simulation immediately
OVM_CALL_HOOK -- Callback the hook method .



Configuration:



Using these methods, user can set the verbosity levels and set actions.


function void set_report_verbosity_level
(int verbosity_level)
function void set_report_severity_action
(ovm_severity severity,ovm_action action)
function void set_report_id_action
(string id,ovm_action action)
function void set_report_severity_id_action
(ovm_severity severity,string id,ovm_action action)








(S)Example


Lets see an example:

In the following example, messages from rpting::run() method are of different verbosity level. In the top module, 3 objects of rpting are created and different verbosity levels are set using set_report_verbosity_level() method.


`include "ovm.svh"
import ovm_pkg::*;

class rpting extends ovm_threaded_component;

`ovm_component_utils(rpting)

function new(string name,ovm_component parent);
super.new(name, parent);
endfunction

task run();

ovm_report_info(get_full_name(),
"Info Message : Verbo lvl - OVM_NONE ",OVM_NONE,`__FILE__,`__LINE__);

ovm_report_info(get_full_name(),
"Info Message : Verbo lvl - OVM_LOW ",OVM_LOW);

ovm_report_info(get_full_name(),
"Info Message : Verbo lvl - 150 ",150);

ovm_report_info(get_full_name(),
"Info Message : Verbo lvl - OVM_MEDIUM",OVM_MEDIUM);

ovm_report_warning(get_full_name(),
"Warning Messgae from rpting",OVM_LOW);

ovm_report_error(get_full_name(),
"Error Message from rpting \n\n",OVM_LOG);
endtask

endclass

module top;

rpting rpt1;
rpting rpt2;
rpting rpt3;

initial begin
rpt1 = new("rpt1",null);
rpt2 = new("rpt2",null);
rpt3 = new("rpt3",null);

rpt1.set_report_verbosity_level(OVM_MEDIUM);
rpt2.set_report_verbosity_level(OVM_LOW);
rpt3.set_report_verbosity_level(OVM_NONE);
run_test();


end
endmodule

(S)Download the source code


ovm_reporting.tar
Browse the code in ovm_reporting.tar


(S)Command to run the simulation


your_tool_simulation_command +path_to_ovm_pkg ovm_log_example.sv



(S)Log file:

OVM_INFO reporting.sv(13)@0:rpt1[rpt1]Info Message:Verbo lvl - OVM_NONE
OVM_INFO @0:rpt1[rpt1] Info Message : Verbo lvl - OVM_LOW
OVM_INFO @0:rpt1[rpt1] Info Message : Verbo lvl - 150
OVM_INFO @0:rpt1[rpt1] Info Message : Verbo lvl - OVM_MEDIUM
OVM_WARNIN@0:rpt[rpt1] Warning Messgae from rpting
OVM_ERROR @0:rpt1[rpt1] Error Message from rpting


OVM_INFOreporting.sv(13)@0:rpt2[rpt2]Info Message:Verbo lvl - OVM_NONE
OVM_INFO@ 0:rpt2[rpt2] Info Message : Verbo lvl - OVM_LOW
OVM_WARNING@0:rpt2[rpt2] Warning Messgae from rpting
OVM_ERROR@0:rpt2[rpt2] Error Message from rpting


OVM_INFOreporting.sv(13)@0:rpt3[rpt3]Info Message:Verbo lvl - OVM_NONE
OVM_ERROR @ 9200 [TIMOUT] Watchdog timeout of '23f0' expired.


Index
Introduction
Ovm Testbench
Ovm Reporting
Ovm Transaction
Ovm Factory
Ovm Sequence 1
Ovm Sequence 2
Ovm Sequence 3
Ovm Sequence 4
Ovm Sequence 5
Ovm Sequence 6
Ovm Configuration

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