linux-kernel - Re: PCI Failed to allocate mem for PCI ROM

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Message-ID: <20080112151212.GB19279@jurassic.park.msu.ru>
Date:	Sat, 12 Jan 2008 18:12:12 +0300
From:	Ivan Kokshaysky <ink@...assic.park.msu.ru>
To:	Grant Grundler <grundler@...isc-linux.org>
Cc:	Kumar Gala <galak@...nel.crashing.org>, Greg KH <greg@...ah.com>,
	LKML <linux-kernel@...r.kernel.org>,
	linuxppc-dev list <linuxppc-dev@...abs.org>,
	linux-pci@...ey.karlin.mff.cuni.cz
Subject: Re: PCI Failed to allocate mem for PCI ROM

On Sat, Jan 12, 2008 at 12:27:05AM -0700, Grant Grundler wrote:
> Looking at setup-bus.c:pci_bridge_check_ranges(), I'm concluding that:
> [7] is IO Range.
> [8] is MMIO
> [9] is Prefetchable MMIO
> [10] no clue...maybe used by host PCI bus controllers.

#10 is for cardbus bridges, IIRC.

> 0x100000 is 1MB and would be the minimum MMIO range that can be allocated.
> So that looks right too. Probably need to find out what is allocating
> 0xe0000000 instead.

I believe that the setup-bus code just tried to allocate 1M ROM of some
device using prefetchable window of the bridge 0000:00:00.0. That failed,
probably because there is no MEM space left on the root bus, which is
perfectly OK. Then, the ROM might be successfully allocated in the
non-prefetchable MMIO space.

So, I don't see any problem in this situation. The only thing I could
suggest is to lower the log level in that message from KERN_ERR to
KERN_WARNING...

Ivan.
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