how to check a specific irq is disabled in linux kernel?

Tony.He90 · 08-01-2023, 03:08 AM

Hi,

I want to know how to check a specific irq is disabled in linux kernel. I can not use the function of irqs_disabled() because irqs_disabled() is to know the state of interrupt system. My question is similar
to this one[1] in stackoverflow. However, no answer there.

[1]https://stackoverflow.com/questions/68554488/how-can-i-check-a-specific-irq-is-disabled-in-linux-kernel

Tony

GlennsPref · 08-27-2023, 12:51 AM

Hi, Welcome to LQ!

The /proc directory is a ...
ref.https://www.cyberciti.biz/faq/howto-...s-under-linux/

Quote:

The proc filesystem is a pseudo filesystem which is used as an interface to kernel data structures.

here's one way...

Code:

cat /proc/interrupts | grep nvidia
  80:          0          0          0          0          0          0     733391          0  IR-PCI-MSI 4718592-edge      nvidia

<edit>
A more suitable example could be...

Code:

cat /proc/interrupts | grep 27
  27:          0          0          0          0          0          0          0          0   PCI-MSI 4096-edge      AMD-Vi
  64:          0          0          0          0          0          0          0          0  IR-PCI-MSI 5249027-edge      xhci_hcd

</edit>

I hope this helps.