On Friday, June 11, 2010 02:44:42 am Yannick Roehlly wrote: > Le Thursday 10 June 2010 01:30:31 Bjorn Helgaas, vous avez écrit : > > On Tuesday, June 08, 2010 05:36:33 pm Yinghai Lu wrote: > > > On 06/08/2010 03:48 PM, Bjorn Helgaas wrote: > > > > On Tuesday, June 08, 2010 03:43:50 pm Jesse Barnes wrote: > > > > > > > > In this case, the aperture *size* from the BIOS is actually OK, but > > > > the beginning of the aperture overlaps system memory. With Yinghai's > > > > patch, we reduce the size and move the start. Windows was able to > > > > just move the start of the aperture and preserve the original > > > > 0x20000000 size (but I think it had to move something else out of > > > > the way). > > > > > > are you sure? that looks more aggressive. > > > > I don't have the machine and can't be 100% sure, but based on what > > Yannic reported here: > > https://bugzilla.kernel.org/show_bug.cgi?id=16009#c11, it looks like > > Windows moved that aperture. > > > > I haven't used it myself, but possibly a program like SIV > > (http://rh-software.com/) would give more detailed information > > about what Windows is doing. > > Hi Bjorn, > > I don't know if it's useful, but here some output of SIV concerning PCI and > the Radeon card. Can SIV generate a big dump of similar output for all devices at once? Then I could avoid bugging you for "look at this, look at that," etc :-) I'm particularly interested in the bridges (the PCIe root ports, in this case). I think Windows moved the 00:01.0 prefetchable aperture. We know from the Linux dmesg that the 00:01.0 bridge was initially configured like this: pci 0000:00:01.0: PCI bridge to [bus 01-01] pci 0000:00:01.0: bridge window [io 0x7000-0x9fff] pci 0000:00:01.0: bridge window [mem 0xfdd00000-0xfddfffff] pci 0000:00:01.0: bridge window [mem 0xbdf00000-0xddefffff 64bit pref] Based on https://bugzilla.kernel.org/show_bug.cgi?id=16009#c11, I think Windows moved the prefetchable aperture: Plage mémoire: 00000000FDD00000 - 00000000FDDFFFFF Plage mémoire: 00000000C0000000 - 00000000DFFFFFFF <== moved Plage d'E/S: 7000 - 9FFF Note that the aperture size is still 0x20000000. Since this new [mem 0xc0000000-0xdfffffff] aperture would conflict with this 00:1c.4 aperture: pci 0000:00:1c.4: bridge window [mem 0xddf00000-0xdfefffff 64bit pref] I think it's likely that Windows moved the 1c.4 aperture as well (or maybe even disabled it, since it leads to buses 06-07, and there are no devices on those buses). Bjorn -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
