linux-kernel - Re: 2.6.33-rc3: pci host bridge windows ignored (works with pci=use

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Message-ID: <20100113132407.GA11350@jgarrett.org>
Date:	Wed, 13 Jan 2010 07:24:07 -0600
From:	jeff@...rrett.org (Jeff Garrett)
To:	Yinghai Lu <yinghai@...nel.org>
Cc:	linux-kernel@...r.kernel.org, Len Brown <lenb@...nel.org>,
	linux-acpi@...r.kernel.org,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	linux-pci@...r.kernel.org, David Airlie <airlied@...ux.ie>
Subject: Re: 2.6.33-rc3: pci host bridge windows ignored (works with
 pci=use_crs)

On Wed, Jan 13, 2010 at 12:45:17AM -0800, Yinghai Lu wrote:
> On Wed, Jan 13, 2010 at 12:44 AM, Yinghai Lu <yinghai@...nel.org> wrote:
> > On Tue, Jan 12, 2010 at 9:37 PM, Jeff Garrett <jeff@...rrett.org> wrote:
> >> Took a stab at getting the right emails.  If I missed anyone, sorry...
> >>
> >> I have a desktop machine with a radeon HD 4850, and on recent kernels
> >> the radeon driver has failed with the message "No valid linear
> >> framebuffer address".  lspci on the broken configuration showed the
> >> first memory region at d0000000 of the radeon card to be ignored.  dmesg
> >> showed there to be a host bridge window at that address which was also
> >> ignored.
> >> ...
> >
> > [    0.000000] BIOS-provided physical RAM map:
> > [    0.000000]  BIOS-e820: 0000000000000000 - 000000000009fc00 (usable)
> > [    0.000000]  BIOS-e820: 000000000009fc00 - 00000000000a0000 (reserved)
> > [    0.000000]  BIOS-e820: 00000000000e0000 - 0000000000100000 (reserved)
> > [    0.000000]  BIOS-e820: 0000000000100000 - 00000000bf790000 (usable)
> > [    0.000000]  BIOS-e820: 00000000bf790000 - 00000000bf79e000 (ACPI data)
> > [    0.000000]  BIOS-e820: 00000000bf79e000 - 00000000bf7d0000 (ACPI NVS)
> > [    0.000000]  BIOS-e820: 00000000bf7d0000 - 00000000bf7e0000 (reserved)
> > [    0.000000]  BIOS-e820: 00000000bf7ec000 - 00000000c0000000 (reserved)
> > [    0.000000]  BIOS-e820: 00000000fee00000 - 00000000fee01000 (reserved)
> > [    0.000000]  BIOS-e820: 00000000ffb00000 - 0000000100000000 (reserved)
> > [    0.000000]  BIOS-e820: 0000000100000000 - 0000000340000000 (usable)
> > ...
> >
> > [    0.833443] PCI: MMCONFIG for domain 0000 [bus 00-ff] at [mem
> > 0xe0000000-0xefffffff] (base 0xe0000000)
> > [    0.835028] PCI: MMCONFIG at [mem 0xe0000000-0xefffffff] reserved
> > in ACPI motherboard resources
> > ...
> >
> > [    0.847449] ACPI: PCI Root Bridge [PCI0] (0000:00)
> > [    0.847470] pci_root PNP0A08:00: ignoring host bridge windows from
> > ACPI; boot with "pci=use_crs" to use them
> > [    0.847693] pci_root PNP0A08:00: host bridge window [io
> > 0x0000-0x0cf7] (ignored)
> > [    0.847695] pci_root PNP0A08:00: host bridge window [io
> > 0x0d00-0xffff] (ignored)
> > [    0.847697] pci_root PNP0A08:00: host bridge window [mem
> > 0x000a0000-0x000bffff] (ignored)
> > [    0.847699] pci_root PNP0A08:00: host bridge window [mem
> > 0x000d0000-0x000dffff] (ignored)
> > [    0.847701] pci_root PNP0A08:00: host bridge window [mem
> > 0xc0000000-0xdfffffff] (ignored)
> > [    0.847703] pci_root PNP0A08:00: host bridge window [mem
> > 0xf0000000-0xfed8ffff] (ignored)
> > ...
> > [    0.848025] IOH bus: [00, fb]
> > [    0.848026] IOH bus: 00 index 0 io port: [0, ffff]
> > [    0.848028] IOH bus: 00 index 1 mmio: [e0000000, fdffffff]
> > ...
> > [    0.849289] PCI: peer root bus 00 res updated from pci conf
> > ...
> > [    0.849361] pci 0000:04:00.0: reg 10: [mem 0xd0000000-0xdfffffff 64bit pref]
> > [    0.849369] pci 0000:04:00.0: reg 18: [mem 0xfbee0000-0xfbeeffff 64bit]
> > [    0.849374] pci 0000:04:00.0: reg 20: [io  0xe000-0xe0ff]
> > [    0.849381] pci 0000:04:00.0: reg 30: [mem 0xfbec0000-0xfbedffff pref]
> > [    0.849423] pci 0000:04:00.1: reg 10: [mem 0xfbefc000-0xfbefffff 64bit]
> > [    0.849481] pci 0000:00:07.0: PCI bridge to [bus 04-04]
> > [    0.849484] pci 0000:00:07.0:   bridge window [io  0xe000-0xefff]
> > [    0.849487] pci 0000:00:07.0:   bridge window [mem 0xfbe00000-0xfbefffff]
> > [    0.849491] pci 0000:00:07.0:   bridge window [mem
> > 0xd0000000-0xdfffffff 64bit pref]
> >
> >
> > it seems HW IOH only can use [e000000 - fdffffff] under that bridge...
> >
> > and _CRS said the peer root bus could use [c000000 - dfffffff]
> >
> > could be that we need to check other register to decide if we can use
> > reading from ioh reg directly.
> 
> can you send out
> 
> lspci -tvnn
> lspci -vvxxxx
> 
> YH

Certainly.  Attached.

-Jeff

View attachment "lspci.1" of type "text/plain" (2383 bytes)

View attachment "lspci.2" of type "text/plain" (223578 bytes)