Date: Thu, 21 Apr 2011 06:51:32 -0500 From: Bret Ketchum <bcketchum@gmail.com> To: freebsd-drivers@freebsd.org Subject: Re: MSI interrupts. Message-ID: <BANLkTik0UuF%2BaktSWAqg-StsDbfqNKHCmw@mail.gmail.com> In-Reply-To: <BANLkTim9WWQDjAJsHNNDRTN%2BnTXbxAonFA@mail.gmail.com>
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As an experiment I made align equal to count in apic_alloc_vectors to
mimic the way MSIX vectors are assigned and all my issue went away..
On Tue, Apr 12, 2011 at 8:16 AM, Bret Ketchum <bcketchum@gmail.com> wrote:
>
> I've a roll-your-own driver for FreeBSD 8.x that uses MSI interrupts
> for PCI-E HBAs where one or more will be installed in a off-the-shelf amd64
> pizza box. The driver is using bus_setup_intr() and depending upon the slots
> the HBAs are install I see log messages from apic_alloc_vectors(), for
> example:
>
> Apr 12 06:44:15 mfsbsd kernel: xxxpci10: attempting to allocate 1 MSI
> vectors (16 supported)
> Apr 12 06:44:15 mfsbsd kernel: APIC: Couldn't find APIC vectors for 1 IRQs
> Apr 12 06:44:15 mfsbsd kernel: ioapic1: routing intpin 13 (PCI IRQ 37) to
> lapic 0 vector 59
>
> Using vmstat -ia:
>
> interrupt total rate
> irq37: xxxpci10 74 0
>
> The problem appears to be that HBA interrupts are not being delivered
> to the driver. If I swap cards around in slots I can eliminate the message
> and:
>
> Apr 12 06:44:15 mfsbsd kernel: msi: routing MSI IRQ 266 to local APIC 0
> vector 80
>
> And interrupts appear to be delivered properly. Before I dive in, can
> anyone explain this behavior?
>
> Thanks in advance.
>
> Dr.
>
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