Description of problem: After switching from current F12 2.6.31 to the .32 testing kernels, noveau starts to fill the log with the following messages: DRHD: handling fault status reg 602 DMAR:[DMA Read] Request device [02:00.0] fault addr 0 DMAR:[fault reason 06] PTE Read access is not set Several messages per second are generated. Version-Release number of selected component (if applicable): kernel-2.6.32.9-67.fc12.x86_64 libdrm-2.4.17-1.fc12.x86_64 mesa-libGL-7.7-4.fc12.x86_64 xorg-x11-server-Xorg-1.7.5-5.fc12.x86_64 xorg-x11-drv-nouveau-0.0.15-20.20091105gite1c2efd.fc12.x86_64 How reproducible: always Steps to Reproduce: 1. boot up machine to X 2. check "dmesg" while working on X Additional info: I'm using KMS. $ uname -a Linux XXXX 2.6.32.9-67.fc12.x86_64 #1 SMP Sat Feb 27 09:26:40 UTC 2010 x86_64 x86_64 x86_64 GNU/Linux $ lspci -nn -s 02:00.0 02:00.0 VGA compatible controller [0300]: nVidia Corporation Device [10de:0659] (rev a1) $ xrandr --query Screen 0: minimum 320 x 200, current 2560 x 1600, maximum 8192 x 8192 DVI-I-0 connected 2560x1600+0+0 (normal left inverted right x axis y axis) 646mm x 406mm 2560x1600 59.9* 1280x800 59.9 DP-0 disconnected (normal left inverted right x axis y axis) DP-1 disconnected (normal left inverted right x axis y axis)
Try adding 'intel_iommu=off' to the kernel boot options.
'intel_iommu=igfx_off' should be enough to stop this from happening.
'intel_iommu=igfx_off' didn't help, only "off" fixed the problem. From /var/log/messages: WITHOUT intel_iommu -> errors Mar 3 15:11:02 XXXXX kernel: Linux version 2.6.32.9-67.fc12.x86_64 (mockbuild.fedoraproject.org) (gcc version 4.4.3 20100127 (Red Hat 4.4.3-4) (GCC) ) #1 SMP Sat Feb 27 09:26:40 UTC 2010 Mar 3 15:11:02 XXXXX kernel: Command line: ro root=/dev/mapper/VolGroup00-LogVol00 rhgb quiet SYSFONT=latarcyrheb-sun16 LANG=en_US.UTF-8 KEYTABLE=fi Mar 3 15:11:02 XXXXX kernel: ACPI: DMAR 00000000000fd3b7 000B8 (v01 DELL B10K 00000015 ASL 00000061) Mar 3 15:11:02 XXXXX kernel: Kernel command line: ro root=/dev/mapper/VolGroup00-LogVol00 rhgb quiet SYSFONT=latarcyrheb-sun16 LANG=en_US.UTF-8 KEYTABLE=fi Mar 3 15:11:02 XXXXX kernel: DMAR: Host address width 36 Mar 3 15:11:02 XXXXX kernel: DMAR: DRHD base: 0x000000fedc0000 flags: 0x1 Mar 3 15:11:02 XXXXX kernel: IOMMU fedc0000: ver 1:0 cap c90780106f0462 ecap f020f6 Mar 3 15:11:02 XXXXX kernel: DMAR: RMRR base: 0x000000bfe58000 end: 0x000000bfe6ffff Mar 3 15:11:02 XXXXX kernel: DMAR: ATSR flags: 0x0 Mar 3 15:11:02 XXXXX kernel: IOMMU 0xfedc0000: using Queued invalidation Mar 3 15:11:02 XXXXX kernel: IOMMU: Setting RMRR: Mar 3 15:11:02 XXXXX kernel: IOMMU: Setting identity map for device 0000:00:1d.0 [0xbfe58000 - 0xbfe70000] Mar 3 15:11:02 XXXXX kernel: IOMMU: Setting identity map for device 0000:00:1d.1 [0xbfe58000 - 0xbfe70000] Mar 3 15:11:02 XXXXX kernel: IOMMU: Setting identity map for device 0000:00:1d.2 [0xbfe58000 - 0xbfe70000] Mar 3 15:11:02 XXXXX kernel: IOMMU: Setting identity map for device 0000:00:1d.7 [0xbfe58000 - 0xbfe70000] Mar 3 15:11:02 XXXXX kernel: IOMMU: Setting identity map for device 0000:00:1a.0 [0xbfe58000 - 0xbfe70000] Mar 3 15:11:02 XXXXX kernel: IOMMU: Setting identity map for device 0000:00:1a.1 [0xbfe58000 - 0xbfe70000] Mar 3 15:11:02 XXXXX kernel: IOMMU: Setting identity map for device 0000:00:1a.2 [0xbfe58000 - 0xbfe70000] Mar 3 15:11:02 XXXXX kernel: IOMMU: Setting identity map for device 0000:00:1a.7 [0xbfe58000 - 0xbfe70000] Mar 3 15:11:02 XXXXX kernel: IOMMU: Prepare 0-16MiB unity mapping for LPC Mar 3 15:11:02 XXXXX kernel: IOMMU: Setting identity map for device 0000:00:1f.0 [0x0 - 0x1000000] Mar 3 15:11:23 XXXXX kernel: DRHD: handling fault status reg 2 Mar 3 15:11:23 XXXXX kernel: DMAR:[DMA Read] Request device [02:00.0] fault addr 0 Mar 3 15:11:23 XXXXX kernel: DMAR:[fault reason 06] PTE Read access is not set WITH intel_iommu=igfx_off -> errors Mar 4 10:11:52 XXXXX kernel: Linux version 2.6.32.9-67.fc12.x86_64 (mockbuild.fedoraproject.org) (gcc version 4.4.3 20100127 (Red Hat 4.4.3-4) (GCC) ) #1 SMP Sat Feb 27 09:26:40 UTC 2010 Mar 4 10:11:52 XXXXX kernel: Command line: ro root=/dev/mapper/VolGroup00-LogVol00 rhgb quiet SYSFONT=latarcyrheb-sun16 LANG=en_US.UTF-8 KEYTABLE=fi intel_iommu=igfx_off Mar 4 10:11:52 XXXXX kernel: ACPI: DMAR 00000000000fd3b7 000B8 (v01 DELL B10K 00000015 ASL 00000061) Mar 4 10:11:52 XXXXX kernel: Kernel command line: ro root=/dev/mapper/VolGroup00-LogVol00 rhgb quiet SYSFONT=latarcyrheb-sun16 LANG=en_US.UTF-8 KEYTABLE=fi intel_iommu=igfx_off Mar 4 10:11:52 XXXXX kernel: Intel-IOMMU: disable GFX device mapping Mar 4 10:11:52 XXXXX kernel: DMAR: Host address width 36 Mar 4 10:11:52 XXXXX kernel: DMAR: DRHD base: 0x000000fedc0000 flags: 0x1 Mar 4 10:11:52 XXXXX kernel: IOMMU fedc0000: ver 1:0 cap c90780106f0462 ecap f020f6 Mar 4 10:11:52 XXXXX kernel: DMAR: RMRR base: 0x000000bfe58000 end: 0x000000bfe6ffff Mar 4 10:11:52 XXXXX kernel: DMAR: ATSR flags: 0x0 Mar 4 10:11:52 XXXXX kernel: IOMMU 0xfedc0000: using Queued invalidation Mar 4 10:11:52 XXXXX kernel: IOMMU: Setting RMRR: Mar 4 10:11:52 XXXXX kernel: IOMMU: Setting identity map for device 0000:00:1d.0 [0xbfe58000 - 0xbfe70000] Mar 4 10:11:52 XXXXX kernel: IOMMU: Setting identity map for device 0000:00:1d.1 [0xbfe58000 - 0xbfe70000] Mar 4 10:11:52 XXXXX kernel: IOMMU: Setting identity map for device 0000:00:1d.2 [0xbfe58000 - 0xbfe70000] Mar 4 10:11:52 XXXXX kernel: IOMMU: Setting identity map for device 0000:00:1d.7 [0xbfe58000 - 0xbfe70000] Mar 4 10:11:52 XXXXX kernel: IOMMU: Setting identity map for device 0000:00:1a.0 [0xbfe58000 - 0xbfe70000] Mar 4 10:11:52 XXXXX kernel: IOMMU: Setting identity map for device 0000:00:1a.1 [0xbfe58000 - 0xbfe70000] Mar 4 10:11:52 XXXXX kernel: IOMMU: Setting identity map for device 0000:00:1a.2 [0xbfe58000 - 0xbfe70000] Mar 4 10:11:52 XXXXX kernel: IOMMU: Setting identity map for device 0000:00:1a.7 [0xbfe58000 - 0xbfe70000] Mar 4 10:11:52 XXXXX kernel: IOMMU: Prepare 0-16MiB unity mapping for LPC Mar 4 10:11:52 XXXXX kernel: IOMMU: Setting identity map for device 0000:00:1f.0 [0x0 - 0x1000000] Mar 4 10:12:15 XXXXX kernel: DRHD: handling fault status reg 2 Mar 4 10:12:15 XXXXX kernel: DMAR:[DMA Read] Request device [02:00.0] fault addr 0 Mar 4 10:12:15 XXXXX kernel: DMAR:[fault reason 06] PTE Read access is not set WITH intel_iommu=off -> no errors Mar 4 10:22:43 XXXXX kernel: Linux version 2.6.32.9-67.fc12.x86_64 (mockbuild.fedoraproject.org) (gcc version 4.4.3 20100127 (Red Hat 4.4.3-4) (GCC) ) #1 SMP Sat Feb 27 09:26:40 UTC 2010 Mar 4 10:22:43 XXXXX kernel: Command line: ro root=/dev/mapper/VolGroup00-LogVol00 rhgb quiet SYSFONT=latarcyrheb-sun16 LANG=en_US.UTF-8 KEYTABLE=fi intel_iommu=off Mar 4 10:22:43 XXXXX kernel: ACPI: DMAR 00000000000fd3b7 000B8 (v01 DELL B10K 00000015 ASL 00000061) Mar 4 10:22:43 XXXXX kernel: Kernel command line: ro root=/dev/mapper/VolGroup00-LogVol00 rhgb quiet SYSFONT=latarcyrheb-sun16 LANG=en_US.UTF-8 KEYTABLE=fi intel_iommu=off Mar 4 10:22:43 XXXXX kernel: Intel-IOMMU: disabled Mar 4 10:22:43 XXXXX kernel: DMAR: Host address width 36 Mar 4 10:22:43 XXXXX kernel: DMAR: DRHD base: 0x000000fedc0000 flags: 0x1 Mar 4 10:22:43 XXXXX kernel: IOMMU fedc0000: ver 1:0 cap c90780106f0462 ecap f020f6 Mar 4 10:22:43 XXXXX kernel: DMAR: RMRR base: 0x000000bfe58000 end: 0x000000bfe6ffff Mar 4 10:22:43 XXXXX kernel: DMAR: ATSR flags: 0x0 As far as I understand the intel_iommu kernel documentation using (igfx_)off points out a bug. Is it OK that I reported the problem here or do I need to post to LKML too?
You're right; if you have to turn the IOMMU protection off because a certain driver is doing bogus DMA to/from page zero, that's a bug. Reassigning to nouveau. Chuck, 'igfx_off' only disables the dedicated IOMMU for the built-in Intel graphics, so it won't make any difference in this case.
Poor Ben, another one of my bug reports ends up on your desk :-) I've now installed the kernel on my second Nvidia machine, but the problem doesn't show up there. My guess is that the Intel Core Duo doesn't have the same IOMMU as the Xeon Quad Core on the Dell T3500 box.
I guess this is duplicate of bug #561267
Agreed, looks like the same problem. *** This bug has been marked as a duplicate of bug 561267 ***