On 12/25/2014 08:55 PM, Bjorn Helgaas wrote: > [+cc Alex, linux-pci, iommu] > > On Thu, Dec 25, 2014 at 12:13 PM, <bugzilla-daemon@xxxxxxxxxxxxxxxxxxx> wrote: >> https://bugzilla.kernel.org/show_bug.cgi?id=90311 >> >> Bug ID: 90311 >> Summary: Hibernate failure with intel_iommu >> Product: Drivers >> Version: 2.5 >> Kernel Version: 3.18.1 >> Hardware: x86-64 >> OS: Linux >> Tree: Mainline >> Status: NEW >> Severity: normal >> Priority: P1 >> Component: PCI >> Assignee: drivers_pci@xxxxxxxxxxxxxxxxxxxx >> Reporter: thomas.lindroth@xxxxxxxxx >> Regression: No >> >> Created attachment 161811 >> --> https://bugzilla.kernel.org/attachment.cgi?id=161811&action=edit >> dmesg with iommu on >> >> Enabling intel_iommu=on causes uswsusp s2disk to fail. Hibernate always works >> fine without iommu and as far as I can tell everything works fine with iommu on >> without hibernating. With intel_iommu set to on I can enter hibernate but the >> system doesn't come back properly. By that I mean the kernel can't read from >> swap and everything freezes. I can still switch between virtual terminals, view >> the system log and use magic sysrq to reboot. The system log is spammed with >> error messages from the scsi subsystem. http://i.imgur.com/ToFd8NM.jpg sdb >> contains root and swap. >> >> I'm guessing the iommu mapping isn't setup properly after resume so the disk >> controller can't do DMA anymore. I have made sure the kernel command line >> contains intel_iommu=on before and after suspend. I have one of the bad marvell >> 88SE9172 controllers but the swap is not connected to it (bug #42679). >> >> I'm running a gentoo system with kernel 3.18.1 on a Gigabyte Z97X-Gaming G1 >> mobo with bios F7 (latest). Finding the problem might be difficult and I don't >> know what kind of information to provide. I can give you any debug output >> needed and apply debug patches if needed. > > Is this a regression? If so, what was the most recent working kernel? It's not a regression but I've only been able to test iommu on kernel 3.17 and up because of that faulty marvell controller. Hibernate fails on both 3.17 and 3.18 but I don't know about older kernels. -- 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
