PCI drivers and interrupts

[Kenneth Adam Miller]

Oh! It's just a particular memory addressed, and that's what is being
memory mapped into user land. Then I could just write a value in the
kernel land, just as I would from the user land, to the address that
is being memory mapped in. I should just read the device spec better
and test how to write to that memory with a function that I'll export.

On Fri, Nov 4, 2016 at 4:54 PM, Andrey Utkin <andrey_utkin at fastmail.com> wrote:
> I've worked on a couple of PCI drivers for Linux, however I haven't
> studied actual PCI bus protocol and such fundamental details. Also I
> haven't read your post thoroughly and haven't visited your links. So I
> can be completely wrong...
>
> But I am very surprised that you want to send interrupts from kernel (to
> PCI peripheral device as I understand).
>
> It is peripheral device which sends interrupts usually, that's why
> there's no notion of interrups sending. To initiate some process on the
> device, which you really want I suppose, usual kernel driver for PCI
> device just writes to certain register of device.