Messages in this thread | | | Date | Sat, 29 Dec 2007 00:12:19 +0300 | From | Ivan Kokshaysky <> | Subject | Re: [Patch v2] Make PCI extended config space (MMCONFIG) a driver opt-in |
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On Fri, Dec 28, 2007 at 12:40:53PM -0500, Loic Prylli wrote: > The only quirk I see removed is a bitmap with an arbitrary size (that we > don't really know is sufficient for every system), and that is only > built using comparison between mmconf and type1 accesses. IMHO, there > is zero knowledge in that removed code (no knowledge about specific > chipsets that work or don't work, or misleading BIOSes).
Precisely.
As a side note: that code also has zero knowledge about what the generic PCI probe code can do later, like it fails to detect this ATI/CRS breakage.
> One thing that could be changed in pci_cfg_space_size() is to avoid > making a special case for PCI-X 266MHz/533Mhz (assume cfg_size == 256 > for such devices too, reserve extended cfg-space for pci-express > devices). There is good reasons to think no such PCI-X 266Mhz/533 device > will ever have an extended-space (no capability IDs was ever defined in > the PCI-X 2.0 spec, no new revision is planned). Such a check would > avoid the possibility of trying extended-conf-space access for PCI-X 2.0 > devices behind a amd-8132 or similar (such accesses would just returnd > -1, but there was some objections raised about doing anything like that > other than at initialization time, even if there is ample reasons to > argue it would be harmless).
I agree, we should remove it. IIRC, this PCI-X check was written long ago with some draft (not a final spec) in hands. Matthew?
Ivan.
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