60 lines
1.6 KiB
Bash
60 lines
1.6 KiB
Bash
#!/bin/bash
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################################################################################
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# Copyright (c) 2015-2016 Wind River Systems, Inc.
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#
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# SPDX-License-Identifier: Apache-2.0
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#
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################################################################################
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#
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# Purpose:
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# Affine the interface IRQ to specified cpulist.
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#
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# Usage: /usr/bin/affine-interrupts.sh interface cpulist
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#
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# Define minimal path
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PATH=/bin:/usr/bin:/usr/local/bin
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# logger setup
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WHOAMI=`basename $0`
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LOG_FACILITY=user
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LOG_PRIORITY=info
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TMPLOG=/tmp/${WHOAMI}.log
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# LOG() - generates log and puts in temporary file
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function LOG {
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logger -t "${0##*/}[$$]" -p ${LOG_FACILITY}.${LOG_PRIORITY} "$@"
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echo "${0##*/}[$$]" "$@" >> ${TMPLOG}
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}
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function INFO {
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MSG="INFO"
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LOG "${MSG} $@"
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}
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function ERROR {
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MSG="ERROR"
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LOG "${MSG} $@"
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}
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if [ "$#" -ne 2 ]; then
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ERROR "Interface name and cpulist are required"
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exit 1
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fi
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interface=$1
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cpulist=$2
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# Find PCI device matching interface, keep last matching device name
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dev=$(find /sys/devices -name "${interface}" | \
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perl -ne 'print $1 if /([[:xdigit:]]{4}:[[:xdigit:]]{2}:[[:xdigit:]]{2}\.[[:xdigit:]])\/[[:alpha:]]/;')
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# Obtain all IRQs for this device
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irq=$(cat /sys/bus/pci/devices/${dev}/irq 2>/dev/null)
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msi_irqs=$(ls /sys/bus/pci/devices/${dev}/msi_irqs 2>/dev/null | xargs)
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INFO $LINENO "affine ${interface} (dev:${dev} irq:${irq} msi_irqs:${msi_irqs}) with cpus (${cpulist})"
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for i in $(echo "${irq} ${msi_irqs}"); do echo $i; done | \
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xargs --no-run-if-empty -i{} \
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/bin/bash -c "[[ -e /proc/irq/{} ]] && echo ${cpulist} > /proc/irq/{}/smp_affinity_list" 2>/dev/null
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exit 0
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