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| author | Bjorn Helgaas <bjorn.helgaas@hp.com> | 2010-03-25 09:28:30 -0600 |
|---|---|---|
| committer | Jesse Barnes <jbarnes@virtuousgeek.org> | 2010-03-25 10:14:13 -0700 |
| commit | d558b483d5a73f5718705b270cb2090f66ea48c8 (patch) | |
| tree | 73c967b1f52afc58d40a171e466e48b43be608b5 /include | |
| parent | eb9fc8ef7cb1362374e55d9503e3e7458f319991 (diff) | |
| download | lwn-d558b483d5a73f5718705b270cb2090f66ea48c8.tar.gz lwn-d558b483d5a73f5718705b270cb2090f66ea48c8.zip | |
x86/PCI: truncate _CRS windows with _LEN > _MAX - _MIN + 1
Yanko's GA-MA78GM-S2H (BIOS F11) reports the following resource in a PCI
host bridge _CRS:
[07] 32-Bit DWORD Address Space Resource
Min Relocatability : MinFixed
Max Relocatability : MaxFixed
Address Minimum : CFF00000 (_MIN)
Address Maximum : FEBFFFFF (_MAX)
Address Length : 3EE10000 (_LEN)
This is invalid per spec (ACPI 4.0, 6.4.3.5) because it's a fixed size,
fixed location descriptor, but _LEN != _MAX - _MIN + 1.
Based on https://bugzilla.kernel.org/show_bug.cgi?id=15480#c15, I think
Windows handles this by truncating the window so it fits between _MIN and
_MAX. I also verified this by modifying the SeaBIOS DSDT and booting
Windows 2008 R2 with qemu.
This patch makes Linux truncate the window, too, which fixes:
http://bugzilla.kernel.org/show_bug.cgi?id=15480
Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
Tested-by: Yanko Kaneti <yaneti@declera.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Diffstat (limited to 'include')
0 files changed, 0 insertions, 0 deletions