linux-kernel - Re: [PATCH] fakephp: Allocate PCI resources before adding the device

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Date:	Fri, 28 Nov 2008 19:42:20 +0100
From:	Rolf Eike Beer <eike-kernel@...tec.de>
To:	Trent Piepho <xyzzy@...akeasy.org>
Cc:	"Darrick J. Wong" <djwong@...ibm.com>,
	Alex Chiang <achiang@...com>,
	"linux-kernel" <linux-kernel@...r.kernel.org>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	"linux-pci" <linux-pci@...r.kernel.org>
Subject: Re: [PATCH] fakephp: Allocate PCI resources before adding the	device

Trent Piepho wrote:
> On Wed, 26 Nov 2008, Darrick J. Wong wrote:
> > On Wed, Nov 26, 2008 at 03:55:35PM -0700, Alex Chiang wrote:
> > > > Maybe it's different on powerpc then?  My pseudo-hotplugable device
> > > > is also the only thing connected to the PCI-E host bus controller. 
> > > > At boot the controller is empty and so I think some code to enable
> > > > its BARs gets skipped.  But without the pci_enable_device(), I get
> > > > this:
> > > >
> > > > 01:00.0 Signal processing controller: Freescale Semiconductor Inc
> > > > Aurora Nexus Trace Interface Flags: fast devsel, IRQ 255
> > > >         Memory at 40000000 (64-bit, prefetchable) [disabled]
> > > > [size=4K]
> >
> >                            Are you referring to this? ^^^^^^^^^^
> >
> > Without seeing the raw dump of the PCI config space, it looks to me like
> > the memory space enable bit of the PCICMD register is unset.  Probably
> > the device driver should call pci_enable_device() at init time, though I
> > suppose you did say earlier that there is no driver.
>
> Yes, that's it.  It seems like since the BARs are normally enabled after a
> device is scanned at boot time that they should also be enabled when a
> device is found by a fakephp rescan.  So I thought it seemed reasonable to
> put pci_enable_device() in fakephp.

No, pci_enable_device() will be called by the device driver. The hotplug 
drivers have nothing to do with that.

Eike

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