On Wed, 2011-11-02 at 16:02 -0500, Giffel, Brad wrote: > I’m working a project using a Spartan 6 FPGA with a PCIe interface and > MSI interrupts. I want to use multiple MSI interrupts (MSI-X is not > supported in the FPGA PCIe core) but the current Linux distribution > (3.0.8) prevents that (lines 23 to 25 in arch/powerpc/kernel/msi.c). > > > > What’s the story here? Is the code in place but not tested? I tried > commenting out those lines but a request_irq() called failed for the > second interrupt requested. Am I wasting my time here? Should I > re-architect to use a single MSI interrupt?
The short and easy answer is you should use a single MSI interrupt. There is some code in place to support multiple MSI, but only in the generic code (drivers/pci/msi.c), and I'm not sure if it's complete. There is no arch support, for any arch AFAIK, and certainly not for powerpc. cheers
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