Method and apparatus for filtering trace information
In a processing system comprising a plurality of data processors at an integrated circuit die, each data processor has a local debug module. In response to acquiring data trace information based upon a corresponding local filtering criteria, the local debug modules transmit their data trace information to a global resource from each of the local debug modules for further filtering by a common filtering criteria.
1. A processing system comprising:
a first interconnect of a first data processor to communicate information between a portion of the first data processor and a first memory;
a first debug module, of the first data processor, coupled to the first interconnect, the first debug module comprising:
a first trace buffer to store data trace information of the first memory that meets a first data trace criteria of the first debug module;
a first data trace filter module coupled to the first trace buffer to filter out data trace information stored at the first trace buffer that does not meet a second data trace criteria;
a second interconnect of a second data processor to communicate information between portions of the second data processor a second memory; and
a second debug module, of the second data processor, coupled to the second interconnect, the second debug module comprising:
a second trace buffer to store data trace information of the second memory that meets a third data trace criteria of the second debug module; and
a second data trace filter module coupled to the second trace buffer to filter out data trace information stored at the second trace buffer that does not meet a fourth data trace criteria.
2. The processing system of claim 1 further comprising a programmable storage location where the second data trace criteria is stored.
3. The processing system of claim 2 wherein each bit of a plurality of data bits of the programmable storage location corresponds to a plurality of bits of the first memory; and the second data trace criteria is not met in response to a bit of the programmable storage location that corresponds to an address of the data trace information being negated.
4. The processing system of claim 3 , the first trace buffer is to maintain data trace information that meets the second data trace criteria, wherein the second data trace criteria is met in response to the bit of the programmable storage location that corresponds to the address of the data trace information being asserted.
5. The processing system of claim 1 , wherein the first interconnect and the first debug module are formed at an integrated circuit die, and the integrated circuit die includes an external debug port through which data trace information stored at the first buffer that is not filtered out is to be communicated to external the integrated circuit die.
6. The processing system of claim 1 , wherein the first and second interconnects and the first and second debug modules are formed at an integrated circuit die, and the integrated circuit die includes a first external debug port through which data trace information stored at the first buffer that is not filtered out is to be communicated to external the integrated circuit die, and the integrated circuit die further includes a second external debug port through which data trace information stored at the second buffer that is not filtered out is to be communicated to external the integrated circuit die.
7. The processing system of claim 1 , wherein the first and second interconnects and the first and second debug modules are formed at an integrated circuit die, and the integrated circuit die includes a first external debug port through which data trace information stored at the first buffer that is not filtered out is to be communicated to external the integrated circuit die, and through which data trace information stored at the second buffer that is not filtered out is to be communicated to external the integrated circuit die.
8. The processing system of claim 1 , wherein the first debug module is to capture the data trace information from the interconnect.
9. The processing system of claim 1 , wherein the data trace information includes address information of the first memory, and data information associated with a location corresponding to the address location.
10. The system of claim 1 , wherein the first trace buffer is to store the data trace information of the first memory in response to detecting at the interconnect a write access of the first memory.
11. A data processing system comprising:
a first debug filter to store, at a first trace buffer, first data trace information indicative of stored data values within a first specified address range that have been modified by a first data processor;
a second debug filter to store, at a second trace buffer, second data trace information indicative of stored data values within a second specified address range that have been modified by a second data processor;
a third debug filter to filter out data trace information stored at the first trace buffer that does not meet a first data trace criteria; and
a fourth debug filter to filter out data trace information stored at the second trace buffer that does not meet a second data trace criteria.
12. The data processing system of claim 11 further comprising:
a system debug controller coupled to the first and second data processors to receive data trace information that is not filtered out by the third and fourth debug filters.
13. The data processing system of claim 11 further comprising:
a first programmable memory local to the first data processor that stores the first data trace criteria; and
a second programmable memory local to the second data processor that stores the second data trace criteria.
14. A method comprising:
storing, at a first trace buffer, first data trace information that is indicative of stored data values within a first specified address range that has been determined by a first debug filter to have been modified by a first data processor;
storing at a second trace buffer, second data trace information that is indicative of stored data values within a second specified address range that has been determined by a second debug module to have been modified by a second data processor;
filtering out data trace information stored at the first trace buffer that has been determined by a third debug filter to not meet a first data trace criteria; and
filtering out data trace information stored at the second trace buffer that has been determined by a fourth debug filter to not meet a second data trace criteria.
15. The method of claim 14 further comprising:
providing to a system debug controller, from the first and second data processors, the data trace information that is not filtered out by the third and fourth debug filters.
16. The method claim 14 , wherein storing the first data trace information includes storing the first data trace information at a first memory that is local to the first data processor; and storing the second data trace information includes storing the second data trace information at a second memory that is local to the second data processor.