Re: [patch] IPMI driver for Linux

From: Corey Minyard (
Date: Wed Aug 21 2002 - 11:52:03 EST

Alan Cox wrote:

>On Wed, 2002-08-21 at 16:47, Corey Minyard wrote:
>>I have been working on an IPMI driver for Linux for MontaVista, and I
>>think it's ready to see the light of day :-). I would like to see this
>>included in the mainstream kernel eventually. You can get it at
>> It should work on any kernel version,
>>although you will have to fix up the and Makefile, and the
>> stuff may not work (it's currently in the 2.4 location).
>>The web page has documentation on the driver, and documentation is
>>included in the patch, too. This is a fairly full-featured driver with
>>a watchdog, panic event generation, full kernel and userland access to
>>the driver, multi-user/multi-interface support, and emulators for other
>>IPMI device drivers.
>Comments in general.
>It touches user space with spinlocks held -> bad idea
Oops, thanks. I've uploaded a version that fixes this. I only found
one instance of this, but it's pretty bad.

>It doesnt check copy_*_user returns instead commenting that some other
>driver didnt so it wont - bad idea too
This was only in the emulation code. I debated about this, but it's
quite possible that doing the check will break the current users of this
code. I'm afraid if I add the checks it will cause other broken code to
not work. I could pull out the emulation code and supply it separately;
I would probably choose to not put that part into the mainstream kernel,

>It seems to be allocating a major - can you have > 1 ipmi per host, can
>it use misc devices, can it get one registered properly with lanana
Yes, you can have multiple IPMI interfaces on a host (I have a board
that has 3!). There are serial-port interfaces planned that could also
easily have multiple instances as well as an on-board KCS. If there's
an easy way to do this with a minor device, I'm all ears, but I'd prefer
to have a separate device for each interface. This is one of the things
I wanted discussion about. Once that gets settled, I'll go to lanana.
 Right now it's just being auto-assigned.

>Otherwise its way way way nicer than the hideous thing a certain chip
>vendor sent me.
I know what you mean.

Thank you for your response and suggestions.


To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
More majordomo info at
Please read the FAQ at

This archive was generated by hypermail 2b29 : Fri Aug 23 2002 - 22:00:23 EST