MSP432P401R: interrupt priority adjustment

Part Number: MSP432P401R

I want to change interrupt priority for my applicatin code, i check the drivelib dco, find the function as beblow.

void Interrupt_setPriority ( uint32_t interruptNumber, uint8_t priority )

but in the  datasheet or user guide, i can not find out enough information to change the priority with this function.

where can i find preempt priority and subpriority setting reference?

thanks.