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Same ISR for two HWI

Victor Kazmirenko
Guru 13202 points

Hello!

In our C6670 based system we are going to use PCIe MSI interrupts. In C6670 each core receives 4 vectors on event Id 17 and 4 vectors on event Id 18. Thus, two HWIs are required to catch them. Is it OK to set same C ISR for both HWI?

Thanks in advance.

  • 0
    TI__Mastermind 28085 points
    Hi,

    For the interrupt controller setup on C6670, there is one typo in the current data manual that event 18 should be "PCIEXpress_MSI_INTn+4" instead of "PCIEXpress_MSI_INTn+1" (which will be fixed in the next data manual release).

    So we have 8 MSI interrupt from PCIe module in C6670, event 17 "PCIEXpress_MSI_INTn" means Core0 (n=0) will accept MSI_INT0 (with MSI vectors 0/8/16/24) and event 18 means Core0 will accept MSI_INT4 as well (with MSI vectors 4/12/20/28). So we have 8 vectors assigned to each Core (4 cores with total 32 MSI vectors).

    In C6678, we have only event 17, so only 4 vectors assigned to each core (8 cores with total 32 MSI vectors).

    Thanks,
  • 0 in reply to Ganapathi Dhandapani95
    Guru 13202 points
    Hello Ganapathi,
    Thank you for reminding about the typo in data manual.
    My question was, however, about other matter. I know I could receive HWI with events 17 and 18. What I want to do is to register one single ISR, say pcie_isr(), as ISR for both HWI. Say I have HWI12 for event 17 and its ISR is pci_isr(), and I have HWI13 for event 18 and want to make its ISR same function, pcie_isr(). In C6670 MSI trigger two primary Corepack events, 17 and 18, thus they cannot be combined and have to be processed by two different HWIs.