Messages in this thread Patch in this message | | | Date | Tue, 03 Oct 2006 21:32:54 +0900 | From | Kenji Kaneshige <> | Subject | Re: The change "PCI: assign ioapic resource at hotplug" breaks my system |
| |
Roland Dreier wrote: > The change "PCI: assign ioapic resource at hotplug" (commit > 23186279658cea6d42a050400d3e79c56cb459b4 in Linus's tree) makes > networking stop working on my system (SuperMicro H8QC8 with four > dual-core Opteron 885 CPUs). In particular, the on-board NIC stops > working, probably because it gets assigned the wrong IRQ (225 in the > non-working case, 217 in the working case) > > With that patch applied, e1000 doesn't work. Reverting just that > patch (shown below) from Linus's latest tree fixes things for me. > > Please let me know what other debug information might be useful. >
The cause of this problem might be an wrong assumption that the 'start' member of resource structure for ioapic device has non-zero value if the resources are assigned by firmware. The 'start' member of ioapic device seems not to be set even though the resources were actually assigned to ioapic devices by firmware.
I made a patch to fix this problem against 2.6.18-git18. This patch checks command register instead of checking 'start' member to see if the ioapic is already enabled by firmware. Unfortunately, I don't have any system to reproduce this problem. Could you please try it and let me know whether the problem is fixed? If the patch below fixes the problem, I'll resend it with description and Signed-off-by.
Thanks, Kenji Kaneshige
--- drivers/pci/setup-bus.c | 10 +++++----- 1 files changed, 5 insertions(+), 5 deletions(-)
Index: linux-2.6.18-git18/drivers/pci/setup-bus.c =================================================================== --- linux-2.6.18-git18.orig/drivers/pci/setup-bus.c 2006-10-03 13:26:49.000000000 +0900 +++ linux-2.6.18-git18/drivers/pci/setup-bus.c 2006-10-03 13:35:00.000000000 +0900 @@ -55,16 +55,16 @@ list_for_each_entry(dev, &bus->devices, bus_list) { u16 class = dev->class >> 8; - /* Don't touch classless devices or host bridges. */ + /* Don't touch classless devices or host bridges or ioapics. */ if (class == PCI_CLASS_NOT_DEFINED || class == PCI_CLASS_BRIDGE_HOST) continue; - /* Don't touch ioapics if it has the assigned resources. */ + /* Don't touch ioapic devices already enabled by firmware */ if (class == PCI_CLASS_SYSTEM_PIC) { - res = &dev->resource[0]; - if (res[0].start || res[1].start || res[2].start || - res[3].start || res[4].start || res[5].start) + u16 command; + pci_read_config_word(dev, PCI_COMMAND, &command); + if (command & (PCI_COMMAND_IO | PCI_COMMAND_MEMORY)) continue; } - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |