http://bugzilla.kernel.org/show_bug.cgi?id=14337
Summary: PCI host bridge driver accepts invalid apertures
Product: ACPI
Version: 2.5
Kernel Version: 2.6.32-rc3
Platform: All
OS/Version: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: Config-Other
AssignedTo: [email protected]
ReportedBy: [email protected]
Regression: No
On x86, we currently ignore PCI host bridge _CRS by default, but booting with
"pci=use_crs" on an HP DL360 G3, BIOS version P31 10/31/2003, ACPI reports
these windows in a PCI host bridge _CRS:
pci_root PNP0A03:00: host bridge window: [io 0x0000-0x0cff]
pci_root PNP0A03:00: host bridge window: [io 0x0000-0x2cfe]
pci_root PNP0A03:00: host bridge window: [io 0x03b0-0x03bb]
pci_root PNP0A03:00: host bridge window: [io 0x03c0-0x03df]
pci_root PNP0A03:00: host bridge window: [mem 0xf5d00000-0xf6ffffff]
pci_root PNP0A03:00: host bridge window: [mem 0x000a0000-0x000bffff]
The bridge has this device behind it:
pci 0000:00:05.2: reg 10: [io 0x2c00-0x2cff]
This device BAR (0x2c00-0x2cff) doesn't fit in the bridge aperture
(0x0-0x2cfe). This leads to the following allocation failure and causes PNP to
mistakenly detect a conflict between a motherboard device and the BAR:
pci 0000:00:05.2: BAR 0: no parent found for device [io 0x2c00-0x2cff]
pci 0000:00:05.2: BAR 0: can't allocate [io 0x2c00-0x2cff]
pnp 00:01: resource [io 0x0092] overlaps 0000:00:05.2 BAR 0 [io
0x0000-0x00ff], disabling
pnp 00:01: resource [io 0x0010-0x001f] overlaps 0000:00:05.2 BAR 0 [io
0x0000-0x00ff], disabling
I think the host bridge aperture size reported by _CRS (0x2cff) is invalid.
The low two bits of PCI I/O BARs are not part of the base address, so I/O
decoders must be aligned on four-byte boundaries, and they must be a multiple
of four bytes in size.
I installed Windows Server 2003 SP1 on this system. The attached Device
Manager screenshot shows that Windows rounded the size up to a multiple of
four.
This is pretty clearly a BIOS bug, but it would be straightforward to work
around it in Linux.
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