waiting at soft(ware)irq level

htfones · 01-27-2018, 10:50 AM

How to pend a request and wait gracefully for the I/o to complete when the request comes in with the request Q lock held (at software irq level)
(wait_event(_intr...) is not an option

htfones · 01-27-2018, 11:55 AM

My confusion is based in my Windows mindset. Windows Knrl Driver Framework manages a sequential queue if requested and IRPs (requests) are automagically status_pending until completed. Just a 411.
In Linux it seems that I need to pull all reqs in the xxx_blkrequest function and tasklet_schedule
a task to process the whole set synchronously.
Any input is still appreciated.
Thanks in advance

AwesomeMachine · 01-27-2018, 08:34 PM

Are you working on a program? Maybe you could give some context.

htfones · 01-27-2018, 08:55 PM

It's a kernel-mode block dev driver i am working on

AwesomeMachine · 01-27-2018, 10:10 PM

I think the kernel has an irq api for modules to use. I don't have the kernel docs on my lappy, but look in there

Code:

/usr/src/kernel-source/Documentation

Or, just look in the kernel source of a few block drivers. You should be able to figure it out. I'm not really sure exactly how to do it. Sorry.