Handling several interrupts in linux kernel driver

zvivered · 05-22-2021, 12:24 PM

Hello,

I'm developing a kernel driver for a PCIe based card.

The card has one interrupt (legacy, not MSI)

Upon interrupt, a status register is read.

According to this register, N channels (out of 8) received a 4MB packet.

As you can see in line 15, a wait queue is declared.

I have to declare 8 queues.

Is it possible to declare an "array" of wait queues ?

Currently I have to write this line 8 times.

Is there a nicer way ?

The interrupt handler calls: sInterruptFlagPacket=1.
The application send an IOCTL request which is blocked (with timeout) till an interrupt received:

wait_event_interruptible(sWaitQueuePacket, sInterruptFlagPacket != 0);
sInterruptFlagPacket = 0;

Thank you,
Zvika

TB0ne · 05-22-2021, 01:37 PM

Quote:

Originally Posted by zvivered

Hello,
I'm developing a kernel driver for a PCIe based card. The card has one interrupt (legacy, not MSI) Upon interrupt, a status register is read. According to this register, N channels (out of 8) received a 4MB packet. As you can see in line 15, a wait queue is declared. I have to declare 8 queues. Is it possible to declare an "array" of wait queues ?

Currently I have to write this line 8 times. Is there a nicer way ? The interrupt handler calls: sInterruptFlagPacket=1. he application send an IOCTL request which is blocked (with timeout) till an interrupt received:

wait_event_interruptible(sWaitQueuePacket, sInterruptFlagPacket != 0);
sInterruptFlagPacket = 0;

This sounds VERY familiar:
https://www.linuxquestions.org/quest...-a-4175685514/
https://www.linuxquestions.org/quest...el-4175682807/
https://www.linuxquestions.org/quest...ng-4175671805/
https://www.linuxquestions.org/quest...ly-4175671763/

...where you've been working on this since last year. Again, as you were told before (several times):

We don't have your custom kernel
We don't have your hardware
We don't have your custom code

So what, exactly, do you think we'll be able to tell you??? It seems like you want us to be free consultants for you, and debug your code.