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

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Message-ID: <4CA1990E.9080206@ladisch.de>
Date:	Tue, 28 Sep 2010 09:28:14 +0200
From:	Clemens Ladisch <clemens@...isch.de>
To:	Jimmie Mayfield <mayfield@...kheads.org>
CC:	linux-kernel@...r.kernel.org
Subject: Re: Trying to reset a PCIe device and scratching my head...

Jimmie Mayfield wrote:
> 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.
> 
> 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.

The PCIe AER driver (drivers/pci/pcie/aer/) sends a hot reset when
it has received a fatal error.  As far as I can tell, it just sets the
PCI_BRIDGE_CTL_BUS_RESET bit of the upstream bridge; everything else
is just infrastructure to handle error reporting and to notify the
device driver about the reset.

Regards,
Clemens
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