On Thu, Jan 08, 2009 at 12:26:38PM -0800, Jesse Barnes wrote: > On Thursday, January 8, 2009 11:56 am Rafael J. Wysocki wrote: > > Cc-ing linux-pci and Jesse. > > > > On Thursday 08 January 2009, Connor Behan wrote: > > > Hello, I am trying to use two video cards. One is the built in ATI Rage > > > Mobility M3 AGP card which drives the screen of my laptop (Thinkpad a22m > > > 2628-S1U if that matters), the other is the ATI Radeon X1550 PCI card in > > > the Thinkpad Dock II which is supposed to drive an external monitor. > > > X1550 is a PCI-E chipset but my card is a PCI card with an onboard PCI > > > to PCI-E bridge. I first tried this with kernel 2.6.27 as packaged by > > > Archlinux and got the following startup errors: > > > > > > pci 0000:00:04.0: BAR 7: can't allocate resource > > > pci 0000:00:04.0: BAR 8: can't allocate resource > > > pci 0000:00:04.0: BAR 9: can't allocate resource > > > > > > I've seen this problem discussed in the archives and couldn't find what > > > looked like a fix. I WAS able to fix this by loading dock, pci_slot, > > > pci_hotplug and acpiphp and appending pci=assign-busses. However since > > > then I have run a package update to kernel 2.6.27.10 and I am once again > > > getting the same problem even with the same modules and parameters. I > > > have since tried appending irqpoll, pci=bios, pci=routeirq and acpi=off > > > with no success. I have even rolled back my kernel to 2.6.27 (and the > > > headers and a few other packages) setup my system the way it was setup > > > before to the best of my knowledge but I still can't get the PCI card > > > working again. Another subtle change must be responsible. > > > > > > Certain PCI devices in the dock are working such as the Cardbus slots... > > > but I could care less about them... is there a way I could tell the > > > kernel to prioritize the video card and sacrifice Cardbus slots first if > > > it can't allocate enough resources? Also my lspci output shows a large > > > gap 01:00.0 to 06:00.0 so some part of my system must have expected > > > other devices in that range. When I had the video card working it was > > > 02:00.0. I have tried changing the four IRQ numbers in the BIOS but this > > > is pointless at best and sometimes causes my soundcard to be disabled. > > > My dmesg, lspci and (trimmed) kernel config are pasted: > > > > > > dmesg: http://pastebin.com/f3ae15a58 > > > lspci: http://pastebin.com/f5d7dee6e > > > .config: http://pastebin.com/fb925760 > > > > > > I'm hoping for a solution that doesn't require recompiling the kernel > > > but I definitely would if that's necessary. In any event I'll be much > > > more vigilant about system updates if I get this working again. > > > Thank-you very much for your time. > > Can you post the output of lspci -vvv somewhere as well after trying 2.6.28? > It may be that we want the "don't allocate resources for transparent bridges" > patch after all: > > diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c > index ea979f2..586451c 100644 > --- a/drivers/pci/setup-bus.c > +++ b/drivers/pci/setup-bus.c > @@ -467,8 +467,12 @@ void __ref pci_bus_size_bridges(struct pci_bus *bus) > } > } > > - /* The root bus? */ > - if (!bus->self) > + /* > + * We don't need to allocate PCI bridging windows > + * for a root bus (everything bridged) or for a > + * transparent one. > + */ > + if (!bus->self || bus->self->transparent) > return; > > switch (bus->self->class >> 8) { Jesse, I think this change is doing the same thing as http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=8fa5913d54f3b1e09948e6a0db34da887e05ff1f which was reverted by http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=12c22d6ef299ccf0955e5756eb57d90d7577ac68 because of http://bugzilla.kernel.org/show_bug.cgi?id=10080 http://marc.info/?l=linux-kernel&m=120620382316329&w=2 http://marc.info/?l=linux-kernel&m=120653981716729&w=2 It definitely seems like the right thing to do but it apparently breaks stuff on systems with oddball transparent bridges. Gary -- Gary Hade System x Enablement IBM Linux Technology Center 503-578-4503 IBM T/L: 775-4503 garyhade@xxxxxxxxxx http://www.ibm.com/linux/ltc -- 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
