Changing smp affinity to specific interrupt

Autonomous Machines Jetson & Embedded Systems Jetson TX2
1

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)

3

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

4

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?

7

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

8

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

9

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.