When using the 1:1 (identity) PCI DMA remapping, PCI Host Bridge devices that do not use the IOMMU causes a kernel panic. Fix that by not inserting those devices into the si_domain. Signed-off-by: Mike Travis Reviewed-by: Mike Habeck --- Specific panic message: IOMMU 0 0xfd020000: using Queued invalidation IOMMU 1 0xfd040000: using Queued invalidation IOMMU 2 0xfd060000: using Queued invalidation IOMMU 3 0xfd080000: using Queued invalidation IOMMU 4 0xfd0a0000: using Queued invalidation IOMMU 5 0xfd0c0000: using Queued invalidation IOMMU: hardware identity mapping for device 1000:3e:00.0 Failed to setup IOMMU pass-through BUG: unable to handle kernel NULL pointer dereference at 000000000000001c IP: [] _raw_spin_lock_irqsave+0xc/0x23 PGD 0 Oops: 0002 [#1] SMP last sysfs file: CPU 512 Modules linked in: Pid: 1, comm: swapper Not tainted 2.6.39-rc7+ #2 Intel Corp. Stoutland Platform RIP: 0010:[] [] _raw_spin_lock_irqsave+0xc/0x23 RSP: 0000:ffff88105fd99d00 EFLAGS: 00010046 RAX: 0000000000000046 RBX: 0000000000000000 RCX: 0000000000000007 RDX: 0000000000010000 RSI: 00000000000000b8 RDI: 000000000000001c RBP: ffff88105fd99d00 R08: 0000000000000000 R09: ffff88107d400470 R10: 000000000000000a R11: 0000000000000086 R12: 000000000000001c R13: 00000000000000b8 R14: ffff88107d82947c R15: 0000000000000286 FS: 0000000000000000(0000) GS:ffff88107fd00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b CR2: 000000000000001c CR3: 0000000001c03000 CR4: 00000000000006e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Process swapper (pid: 1, threadinfo ffff88105fd98000, task ffff88105fd90000) Stack: ffff88105fd99d20 ffffffff812ad179 ffff88107d829400 ffff8b6ffe820f00 ffff88105fd99d40 ffffffff8108eb2f ffff88105fd99d40 ffff88107d829400 ffff88105fd99d80 ffffffff8108e396 ffff8beffa854c00 ffff88107d829400 Call Trace: [] dmar_msi_mask+0x17/0x3b [] irq_shutdown+0x43/0x4e [] __free_irq+0xd1/0x15d [] free_irq+0x59/0x72 [] free_dmar_iommu+0x10a/0x1cb [] free_iommu+0x16/0x30 [] intel_iommu_init+0x8c1/0x9de [] ? dma32_reserve_bootmem+0x6/0x6 [] pci_iommu_init+0x16/0x41 [] do_one_initcall+0x7c/0x130 [] kernel_init+0xf9/0x17e [] kernel_thread_helper+0x4/0x10 [] ? do_early_param+0x89/0x89 [] ? gs_change+0xb/0xb Code: b8 00 00 01 00 48 89 e5 f0 0f c1 07 0f b7 d0 c1 e8 10 39 c2 74 07 f3 90 0f b7 17 eb f5 c9 c3 55 48 89 e5 9c 58 fa ba 00 00 01 00 0f c1 17 0f b7 ca c1 ea 10 39 d1 74 07 f3 90 0f b7 0f eb f5 RIP [] _raw_spin_lock_irqsave+0xc/0x23 RSP CR2: 000000000000001c ---[ end trace 32b2ebdae113b4c3 ]--- swapper used greatest stack depth: 3952 bytes left Kernel panic - not syncing: Attempted to kill init! Pid: 1, comm: swapper Tainted: G D 2.6.39-rc7+ #2 Call Trace: [] panic+0xb7/0x1be [] ? task_rq_unlock+0xc/0xe [] ? sched_move_task+0xb0/0xbb [] ? __put_css_set+0x24/0x150 [] do_exit+0xa9/0x775 [] ? spin_unlock_irqrestore+0x9/0xb [] oops_end+0xb3/0xbb [] no_context+0x1f5/0x204 [] __bad_area_nosemaphore+0x182/0x1a5 [] ? __delay+0xa/0xc [] ? __const_udelay+0x39/0x3b [] bad_area_nosemaphore+0xe/0x10 [] do_page_fault+0x170/0x320 [] ? __delay+0xa/0xc [] ? wait_for_xmitr+0x24/0x89 [] ? __call_console_drivers+0x78/0x8a [] ? apic_timer_interrupt+0xe/0x20 [] page_fault+0x1f/0x30 [] ? _raw_spin_lock_irqsave+0xc/0x23 [] dmar_msi_mask+0x17/0x3b [] irq_shutdown+0x43/0x4e [] __free_irq+0xd1/0x15d [] free_irq+0x59/0x72 [] free_dmar_iommu+0x10a/0x1cb [] free_iommu+0x16/0x30 [] intel_iommu_init+0x8c1/0x9de [] ? dma32_reserve_bootmem+0x6/0x6 [] pci_iommu_init+0x16/0x41 [] do_one_initcall+0x7c/0x130 [] kernel_init+0xf9/0x17e [] kernel_thread_helper+0x4/0x10 [] ? do_early_param+0x89/0x89 [] ? gs_change+0xb/0xb --- drivers/pci/intel-iommu.c | 5 +++++ 1 file changed, 5 insertions(+) --- linux.orig/drivers/pci/intel-iommu.c +++ linux/drivers/pci/intel-iommu.c @@ -47,6 +47,8 @@ #define ROOT_SIZE VTD_PAGE_SIZE #define CONTEXT_SIZE VTD_PAGE_SIZE +#define IS_BRIDGE_HOST_DEVICE(pdev) \ + ((pdev->class >> 8) == PCI_CLASS_BRIDGE_HOST) #define IS_GFX_DEVICE(pdev) ((pdev->class >> 16) == PCI_BASE_CLASS_DISPLAY) #define IS_ISA_DEVICE(pdev) ((pdev->class >> 8) == PCI_CLASS_BRIDGE_ISA) #define IS_AZALIA(pdev) ((pdev)->vendor == 0x8086 && (pdev)->device == 0x3a3e) @@ -2214,6 +2216,9 @@ static int __init iommu_prepare_static_i return -EFAULT; for_each_pci_dev(pdev) { + /* Skip Host/PCI Bridge devices */ + if (IS_BRIDGE_HOST_DEVICE(pdev)) + continue; if (iommu_should_identity_map(pdev, 1)) { printk(KERN_INFO "IOMMU: %s identity mapping for device %s\n", hw ? "hardware" : "software", pci_name(pdev)); -- -- 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/