From owner-freebsd-hackers  Mon Feb 16 13:19:12 1998
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Message-ID: <19980216214255.33660@mi.uni-koeln.de>
Date: Mon, 16 Feb 1998 21:42:55 +0100
From: Stefan Esser <se@FreeBSD.ORG>
To: "Daniel O'Connor" <doconnor@gsoft.com.au>, hackers@FreeBSD.ORG
Cc: =?iso-8859-1?Q?Stefan_E=DFer?= <se@FreeBSD.ORG>
Subject: Re: PCI LKM's?
Mail-Followup-To: Daniel O'Connor <doconnor@gsoft.com.au>,
	hackers@FreeBSD.ORG,
	=?iso-8859-1?Q?Stefan_E=DFer?= <se@freebsd.org>
References: <199802130130.MAA09978@cain.gsoft.com.au>
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In-Reply-To: <199802130130.MAA09978@cain.gsoft.com.au>; from Daniel O'Connor on Fri, Feb 13, 1998 at 12:00:24PM +1030
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On 1998-02-13 12:00 +1030, Daniel O'Connor <doconnor@gsoft.com.au> wrote:
> Hi,
> I am trying to convert a static PCI device driver to an LKM, but I can't fiure 
> out how to probe it.. If its an ISA device I run the probe routine with the 
> config info, but for a PCI device I don't know how to tell if it is inthe 
> machine or not after boot time.
> 
> I tried looking in /usr/src/sys/pci/* for examples, but pcisupport.c was the 
> only thing with any LKM stuff and it didn't help :(
> 
> Can anyone help me?
> (I am running 2.2.5-STABLE)

I added PCI LKM support to the PCI code more than one year 
ago, but never put it into the "official" 2.2.x repository.
If you want patches, I can provide you with them, but if 
there is sufficient interest, I can also commit that code
to -stable.

The interface is very simple:

  int pci_register_lkm (struct pci_device *dvp, int if_revision)

Call that function with the address of the pci_device struct
(the XXX argument of the "DATA_SET(pcidevice_set, XXX);" for
the compiled in driver case) and an interface revision value
of 0, and everything else will be taken care of automagically.

I added a support function to pciconf (or rather the underlying
ioctl()), which reported whether a driver had been attached to
a device. This allowed the loading of PCI LKMs from a script
called from /etc/rc, controlled by the PCI vendor and device
IDs.

Regards, STefan

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