On Wed, Jan 16, 2013 at 3:38 PM, Stephen Hemminger <stephen@xxxxxxxxxxxxxxxxxx> wrote: > I see this on boot in dmesg > > [ 0.574494] DMAR: No ATSR found > [ 0.574549] IOMMU 0 0xfed90000: using Queued invalidation > [ 0.574550] IOMMU 1 0xfed91000: using Queued invalidation > [ 0.574554] IOMMU: Setting RMRR: > [ 0.574583] IOMMU: Setting identity map for device 0000:00:02.0 [0xcf000000 - > 0xdf1fffff] > [ 0.575748] IOMMU: Setting identity map for device 0000:00:1d.0 [0xcd551000 - > 0xcd56dfff] > [ 0.575767] IOMMU: Setting identity map for device 0000:00:1a.0 [0xcd551000 - > 0xcd56dfff] > [ 0.575786] IOMMU: Setting identity map for device 0000:00:14.0 [0xcd551000 - > 0xcd56dfff] > [ 0.575797] IOMMU: Prepare 0-16MiB unity mapping for LPC > [ 0.575806] IOMMU: Setting identity map for device 0000:00:1f.0 [0x0 - 0xffff > ff] > [ 0.576186] PCI-DMA: Intel(R) Virtualization Technology for Directed I/O > [ 0.576337] ------------[ cut here ]------------ > [ 0.576342] WARNING: at drivers/pci/search.c:46 pci_find_upstream_pcie_bridge > +0x59/0x71() > [ 0.576343] Hardware name: System Product Name > [ 0.576344] Modules linked in: > [ 0.576347] Pid: 1, comm: swapper/0 Not tainted 3.8.0-rc1-net-next+ #4 > [ 0.576348] Call Trace: > [ 0.576352] [<ffffffff81074261>] warn_slowpath_common+0x83/0x9c > [ 0.576355] [<ffffffff813fae71>] ? bus_set_iommu+0x49/0x49 > [ 0.576357] [<ffffffff81074294>] warn_slowpath_null+0x1a/0x1c > [ 0.576360] [<ffffffff812db618>] pci_find_upstream_pcie_bridge+0x59/0x71 > [ 0.576362] [<ffffffff813fd247>] intel_iommu_add_device+0x4d/0x17a > [ 0.576364] [<ffffffff813faeab>] add_iommu_group+0x3a/0x48 > [ 0.576368] [<ffffffff8135d490>] bus_for_each_dev+0x57/0x89 > [ 0.576370] [<ffffffff813fae6a>] bus_set_iommu+0x42/0x49 > [ 0.576374] [<ffffffff81b1b1a5>] intel_iommu_init+0xa27/0xb44 > [ 0.576377] [<ffffffff8105dcf3>] ? free_init_pages+0xf5/0x10d > [ 0.576379] [<ffffffff81aeb87d>] ? maybe_link.part.2+0x10b/0x10b > [ 0.576382] [<ffffffff81aeef53>] ? memblock_find_dma_reserve+0x133/0x133 > [ 0.576384] [<ffffffff81aeef66>] pci_iommu_init+0x13/0x3e > [ 0.576387] [<ffffffff8100023c>] do_one_initcall+0x7f/0x133 > [ 0.576390] [<ffffffff814d0c2c>] kernel_init+0x146/0x29b > [ 0.576393] [<ffffffff81aea52f>] ? do_early_param+0x8c/0x8c > [ 0.576395] [<ffffffff814d0ae6>] ? rest_init+0xda/0xda > [ 0.576398] [<ffffffff814ed4dc>] ret_from_fork+0x7c/0xb0 > [ 0.576400] [<ffffffff814d0ae6>] ? rest_init+0xda/0xda > [ 0.576406] ---[ end trace f709d1eb2b66cbf5 ]--- > > $ sudo lspci -t -vv > -[0000:00]-+-00.0 Intel Corporation Xeon E3-1200 v2/3rd Gen Core processor DRAM Controller > +-01.0-[01-02]----00.0 Intel Corporation Ethernet Controller 10-Gigabit X540-AT2 > +-02.0 Intel Corporation Xeon E3-1200 v2/3rd Gen Core processor Graphics Controller > +-14.0 Intel Corporation 7 Series/C210 Series Chipset Family USB xHCI Host Controller > +-16.0 Intel Corporation 7 Series/C210 Series Chipset Family MEI Controller #1 > +-1a.0 Intel Corporation 7 Series/C210 Series Chipset Family USB Enhanced Host Controller #2 > +-1b.0 Intel Corporation 7 Series/C210 Series Chipset Family High Definition Audio Controller > +-1c.0-[03]-- > +-1c.4-[04]----00.0 Realtek Semiconductor Co., Ltd. RTL8111/8168B PCI Express Gigabit Ethernet controller > +-1c.5-[05-06]----00.0-[06]-- > +-1d.0 Intel Corporation 7 Series/C210 Series Chipset Family USB Enhanced Host Controller #1 > +-1f.0 Intel Corporation Z77 Express Chipset LPC Controller > +-1f.2 Intel Corporation 7 Series/C210 Series Chipset Family 6-port SATA Controller [AHCI mode] > \-1f.3 Intel Corporation 7 Series/C210 Series Chipset Family SMBus Controller I think drivers/pci/search.c is identical between 3.7 and 3.8-rc1. Is this the first time you've turned on the IOMMU on that box? It's the same warning as in this bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=44881, and there's a patch there at https://bugzilla.kernel.org/show_bug.cgi?id=44881#c11, but it's just a quirk that turns off VT-d if we find certain broken bridges. It doesn't look like you have any of those (although I don't know what you have at 05:00.0). 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
