IPI Handling by EM Module - 2021.1 English

Along with the PM module, error management module also uses IPI-0 channel for message exchange. APU and RPU 0/1 masters can communicate to this module using IPI. The target_module_id in IPI message differentiates which module needs to take an action based on the message received. The target_module_id for IPI handler registered for EM module is 0xE. Currently, PMU firmware supports only the messages shown in the following table using IPI.

Set Error Action

When this IPI message is received from any target to PMU firmware, PMU firmware sets the error action for the error ID received in the message. If processing of the message is successful, it sends SUCCESS (0x0) response to the target. Otherwise FAILURE (0x1) response will be sent. The message format for the same is as below:

Remove Error Action

When this IPI message is received from any target to PMU firmware, EM module IPI handler will remove the error action for the error ID received. And after processing the message, it will send SUCCESS/FAILURE response to the target respectively. The message format for the same is as below:

Send Errors Occurred

PMU firmware saves the errors that occur in the system and sends to the target upon request. The message format is as below:

The following table shows the response message sent by PMU firmware.