Hi I tried changing smp affinity to specfic interrupt from user space by using the following command: echo 2 > proc/irq/357/smp_affinity but I goth the following error “bash: echo: write error: Input/output error” Whwn I searched the particular irq details in /proc/interrupts. I got the following result: 357: 0 0 0 0 0 0 tegra-gpio-aon 42 Edge Please provide details about changing the smp affinity to the particular irq No. (either from user space or using kernel module)

because the smp affinity works only to interrupts being handled by ARM GIC. cat /proc/interrupts will show who is the parent for each of the interrutps.

Sorry to tell not support to change it for GPIO interrupt.

Hi Shane, Thanks for the reply. When I checked the smp_affinity cat proc/irq/357/smp_affinity 3f The affinity is 3F but the interrupt count gets incremented only at CPU0 when I checked /proc/interrupts 357: 996 0 0 0 0 0 tegra-gpio-aon 42 Edge Why the interrupts are not processed in other cores even though the affinity is set for all cores?. Can you please provide details?

Hi Bibek, Can you provide details on why interrupt is not processed in other cores. Whether any change need to be done in gpio driver

Changing smp affinity to specific interrupt

Robotics & Edge Computing Jetson Systems Jetson TX2

Bibek April 28, 2021, 7:41am 7

gpio interrupt affinity can not be changed.
since gpio interrupt controller is independent. GIC is not handling

Adjusting GPIO IRQ affinity in GIC

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Changing smp affinity to specific interrupt

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