linux-kernel - Trying to reset a PCIe device and scratching my head...

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Message-ID: <20100928020548.GA90230@sackheads.org>
Date:	Mon, 27 Sep 2010 22:05:48 -0400
From:	Jimmie Mayfield <mayfield@...kheads.org>
To:	linux-kernel@...r.kernel.org
Subject: Trying to reset a PCIe device and scratching my head...

Hello.  I'm in the process of writing a device driver for a PCIe
device where the bulk of the logic, including the PCIe interface, is 
implemented on a couple of large FPGAs.  Current target platform is x86 
Linux.

Having the PCIe interface implemented inside FPGA 'A' makes upgrading
that particular FPGA rather troublesome.  In a perfect world, one would
be able to upgrade the FPGA without having to reboot the machine.  The
hardware guys have designed the card to reload that FPGA image upon a
slot reset...either fundamental or hot.  (If I could guarantee the
card would always be plugged into a hotplug-capable slot, I suppose I could
forge a hotplug event and toggle power to the slot.  But I can't impose
that requirement on customers.)

So I'd like to be able to send either a fundamental or hot reset to the
device but so far I've had no success.  Is there a recommended way of doing 
this on x86 Linux?  

Jimmie

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