Date: Fri, 15 Apr 2011 12:11:49 -0400 From: John Baldwin <jhb@freebsd.org> To: freebsd-drivers@freebsd.org Cc: Bret Ketchum <bcketchum@gmail.com> Subject: Re: MSI interrupts. Message-ID: <201104151211.49148.jhb@freebsd.org> In-Reply-To: <BANLkTim9WWQDjAJsHNNDRTN%2BnTXbxAonFA@mail.gmail.com> References: <BANLkTim9WWQDjAJsHNNDRTN%2BnTXbxAonFA@mail.gmail.com>
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On Tuesday, April 12, 2011 9:16:16 am Bret Ketchum 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? Hmm, can you capture messages with bootverbose enabled? A full boot -v dmesg might be useful as well. -- John Baldwin
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