Messages in this thread | | | Subject | Re: Question on using MSI in PCI driver | From | Roland Dreier <> | Date | Mon, 21 Jun 2004 20:54:38 -0700 |
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Jeff> You are breaking new ground by adding MSI support to a Jeff> driver. I thank you for this -- alot -- but you should Jeff> realize there will probably be a little bit of PCI core work Jeff> necessary in order to get things the way you want them.
Yes, I noticed only a couple of hotplug drivers seem to be using MSI, and no one is using multiple vector support. My motivation is twofold. First, because my device can generate interrupts for different reasons, and I'm noticing that doing the MMIO read to the cause register is taking a lot of time, so I'm wondering whether avoiding this by having separate MSI-X messages will be a win. Second, for the fun of trying it :)
Jeff> Feel free to propose changes to the PCI core to accomodate Jeff> your MSI driver.
First patch coming up now :)
- Roland
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