Date: Tue, 12 Apr 2011 08:16:16 -0500 From: Bret Ketchum <bcketchum@gmail.com> To: freebsd-drivers@freebsd.org Subject: MSI interrupts. Message-ID: <BANLkTim9WWQDjAJsHNNDRTN%2BnTXbxAonFA@mail.gmail.com>
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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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