Re: Adding a second PCI interrupt handler

Subject: Re: Adding a second PCI interrupt handler

From: Josh de Cesare <email@hidden>

Date: Fri, 24 Sep 2004 09:11:55 -0700

Delivered-to: email@hidden

Title: Re: Adding a second PCI interrupt handler

Ron,

PCI Devices are only allowed to use one interrupt per function. IOPCIDevice's will always only have one interrupt at index zero. Some of the devices built in to Apple's core logic are designed to to have multiple interrupts, device, dma, Tx, Rx, etc.

Josh

At 10:32 AM -0400 9/24/04, Ron Duritsch wrote:

I am modifying a PCI driver by adding another secondary interrupt to handle DMA interrupts. I found a perfect (I thought) sample in Developer Connection that does just this, so I followed it to the letter. But whenever I create the second IOFilterInterruptEventSource, with an index of 1 (the first used an index of 0), it fails. I switched the two around so index 0 became index 1, to test if my new code was the problem, but always the second index fails.

Here's the code. Any ideas?

Ron Duritsch
Trilobyte Software

// create and register my interrupt event source
fBoardInterrupt = IOFilterInterruptEventSource::filterInterruptEventSource(this,
                    (IOInterruptEventAction) &com_diaginc_iokit_SpotPCI::interruptOccured,
                    (IOFilterInterruptAction) &com_diaginc_iokit_SpotPCI::checkForInterrupt,
                    provider,
                    (int)0);

if (fBoardInterrupt)
{
    if (fWorkLoop->addEventSource(fBoardInterrupt) != kIOReturnSuccess)
    {
        result = false;
        IOLog("%s: Failed to add interrupt event source to work loop!\n", getName());
    }
}
else
{
    result = false;
    IOLog("%s: Failed to create interrupt event source!\n", getName());
}

// R.D. 20040319 DMA interrupt - THIS FAILS
if (result == true)
{
    fDMAInterrupt = IOFilterInterruptEventSource::filterInterruptEventSource(this,
                        (IOInterruptEventAction) &com_diaginc_iokit_SpotPCI::DMAinterruptOccured,
                        (IOFilterInterruptAction) &com_diaginc_iokit_SpotPCI::checkForDMAInterrupt,
                        provider,
                        (int)1);
}

if (fDMAInterrupt)
{
    if (fWorkLoop->addEventSource(fDMAInterrupt) != kIOReturnSuccess)
    {
        result = false;
        IOLog("%s: Failed to add DMA interrupt event source to work loop!\n", getName());
    }
}
else
{
    result = false;
    IOLog("%s: Failed to create DMA interrupt event source!\n", getName());
}

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References:

>Adding a second PCI interrupt handler (From: Ron Duritsch <email@hidden>)