linux-kernel - Re: [2.6.34-rc1 REGRESSION] ahci 0000:00:1f.2: controller reset failed (0xffffffff)

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Message-ID: <20100412215657.GB19226@linux.intel.com>
Date:	Mon, 12 Apr 2010 14:56:57 -0700
From:	Matthew Wilcox <willy@...ux.intel.com>
To:	Bjorn Helgaas <bjorn.helgaas@...com>
Cc:	Andy Isaacson <adi@...apodia.org>, linux-kernel@...r.kernel.org,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Chris Wright <chrisw@...s-sol.org>,
	Yinghai Lu <yinghai@...nel.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	"H. Peter Anvin" <hpa@...or.com>
Subject: Re: [2.6.34-rc1 REGRESSION] ahci 0000:00:1f.2: controller reset
	failed (0xffffffff)

On Mon, Apr 12, 2010 at 11:56:41AM -0600, Bjorn Helgaas wrote:
> Linux thinks the windows are:
>   pci_root PNP0A03:00: host bridge window [mem 0x000a0000-0x000bffff]
>   pci_root PNP0A03:00: host bridge window [mem 0x000c0000-0x000effff]
>   pci_root PNP0A03:00: host bridge window [mem 0x000f0000-0x000fffff]
> 
> The 0xa0000-0xbffff one makes good sense.  That's normally MMIO that's
> routed via PCI to the VGA device frame buffer, and we should be able
> to figure out how to avoid that area, e.g., by using BIOS info, PCI
> class codes, etc.
> 
> Now we need to figure how to avoid the 0xc0000-0xeffff and 0xf0000-0xfffff
> windows.  Maybe there's something special about how ACPI describes them.
> 
> Or maybe we're just unlucky because these are the first windows in the
> _CRS list, and Linux tries them in order, while Windows uses a different
> strategy.

Perhaps it's sufficient to try them in reverse order?
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