Systems and methods for managing task watchdog status register entries
View Patent ↗The present disclosure provides system and method embodiments for a status register comprising a plurality of bits, where each of the plurality of bits of the status register is associated with one of a plurality of entities. A trigger mechanism is configured to write a trigger data pattern to the status register, where the trigger data pattern comprises a first state value for each of the plurality of bits of the status register. A capture mechanism is configured to write a second state value to each bit of the status register that is associated with an entity that is presently associated with a first type of entity status information, in response to a detection that the trigger data pattern is written to the status register.
1. A data processing system comprising:
one or more processors each configured to execute a plurality of tasks;
one or more watchdog status registers each comprising a plurality of bits, wherein
each watchdog status register is associated with one of the one or more processors, and
each bit of the plurality of bits of one watchdog status register is associated with one task of the plurality of tasks of one processor that is associated with the one watchdog status register;
a centralized watchdog task configured to
determine whether every bit of the plurality of bits of a respective watchdog status register stores a first state value, and
write a trigger data pattern to the respective watchdog status register, in response to a determination that every bit of the plurality of bits of the respective watchdog status register stores the first state value, wherein
the trigger data pattern comprises the first state value for each of the plurality of bits of the respective watchdog status register; and
one or more hardware logic circuits each associated with a particular processor that is associated with a particular watchdog status register, each hardware logic circuit configured to
identify a set of active tasks of the particular processor that are presently in an active task state, in response to a detection that the trigger data pattern is written to the particular watchdog status register.
2. The data processing system of claim 1 , wherein
each hardware logic circuit is further configured to
write a second state value to each bit of the particular watchdog status register that is associated with one of the set of active tasks, and
the first state value remains in each bit of the particular watchdog status register that is not associated with one of the set of active tasks.
3. The data processing system of claim 2 , wherein
each hardware logic circuit is further configured to
detect that a particular task has a task state transition from the active task state to an inactive task state, and
write the second state value to a particular bit of the particular watchdog status register that is associated with the particular task to store the first state value in the particular bit, in response to detection of the task state transition.
4. The data processing system of claim 1 , wherein
the centralized watchdog task is further configured to
provide an error notification in response to a determination that every bit of the plurality of bits does not store the first state value.
5. The data processing system of claim 4 , wherein
the error notification comprises a task identifier of each task associated with each bit that does not store the first state value.
6. The data processing system of claim 4 , wherein
the centralized watchdog task is further configured to
write the trigger data pattern to the respective watchdog status register, subsequent to the error notification.
7. The data processing system of claim 1 , wherein
each hardware logic circuit is configured to identify the set of active tasks by being further configured to
sample a plurality of present task state identifiers of the plurality of tasks of the particular processor, and
determine whether a respective present task state identifier (ID) of a respective task does not match an inactive task state value, wherein
the respective task is identified as one of the set of active tasks in response to a determination that the respective present task state ID does not match the inactive task state value.
8. The data processing system of claim 1 , further comprising:
a watchdog task scheduler configured to
initiate the centralized watchdog task in response to expiration of a time period, wherein
the time period has a duration longer than a maximum expected task lifetime, and
the centralized watchdog task is configured to terminate after the trigger data pattern is written to the watchdog status register.
9. The data processing system of claim 1 , wherein
each hardware logic circuit is further configured to
selectively clear a particular bit of the particular watchdog status register in response to detection that a debugging mode is activated for a particular task associated with the particular bit.
10. An integrated circuit comprising:
a status register comprising a plurality of bits, wherein
each of the plurality of bits of the status register is associated with one of a plurality of entities;
a trigger mechanism configured to
write a trigger data pattern to the status register in response to a determination that every bit of the plurality of bits stores a first state value, wherein
the trigger data pattern comprises the first state value for each of the plurality of bits of the status register; and
a capture mechanism configured to
write a second state value to each bit of the status register that is associated with an entity that is presently associated with a first type of entity status information, in response to a detection that the trigger data pattern is written to the status register.
11. The integrated circuit of claim 10 , further comprising
a clear mechanism configured to
write the second state value to a particular bit of the status register to store the first state value in the particular bit.
12. The integrated circuit of claim 11 , wherein
the first state value comprises a logic low value, and
the second state value comprises a logic high value.
13. A method comprising:
determining, by a centralized watchdog task configured to execute on a processor, whether every bit of a plurality of bits of a watchdog status register stores a first state value, wherein
each bit of the plurality of bits is associated with one task of a plurality of tasks;
writing, by the centralized watchdog task, a trigger data pattern to the watchdog status register, in response to a determination that every bit of the plurality of bits stores the first state value, wherein
the trigger data pattern comprises the first state value for each of the plurality of bits; and
identifying, by hardware logic circuitry, a set of active tasks that are presently in an active task state, in response to a detection that the trigger data pattern is written to the watchdog status register.
14. The method of claim 13 , further comprising:
writing, by the hardware logic circuitry, a second state value to each bit of the watchdog status register that is associated with one of the set of active tasks, wherein
the first state value remains in each bit of the watchdog status register that is not associated with one of the set of active tasks.
15. The method of claim 14 , further comprising:
detecting, by the hardware logic circuitry, that a particular task has a task state transition from the active task state to an inactive task state; and
writing, by the hardware logic circuitry, the second state value to a particular bit of the watchdog status register that is associated with the particular task to store the first state value in the particular bit, in response to detection of the task state transition.
16. The method of claim 13 , further comprising:
providing, by the centralized watchdog task, an error notification in response to a determination that every bit of the plurality of bits does not each store the first state value, wherein
the error notification comprises a task identifier of each task associated with each bit that does not store the first state value.
17. The method of claim 16 , further comprising:
writing, by the centralized watchdog task, the trigger data pattern to the watchdog status register, subsequent to the error notification.
18. The method of claim 13 , wherein
the identifying the set of active tasks further comprises
sampling a plurality of present task state identifiers of the plurality of tasks, and
determining whether a respective present task state identifier (ID) of a respective task does not match an inactive task state value, wherein
the respective task is identified as one of the set of active tasks in response to a determination that the respective present task state ID does not match the inactive task state value.
19. The method of claim 13 , further comprising:
initiating, by a watchdog task scheduler, the centralized watchdog task in response to expiration of a time period, wherein
the time period has a duration longer than a maximum expected task lifetime, and
the centralized watchdog task is configured to terminate after the trigger data pattern is written to the watchdog status register.
20. The method of claim 13 , further comprising:
selectively clearing, by the hardware logic circuitry, a particular bit of the watchdog status register in response to a detection that a debugging mode is selected for a particular task associated with the particular bit.