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SubjectRe: [Intel-gfx] [PATCH v3 0/6] Convert the intel iommu driver to the dma-iommu api
From
Date
On 2020-09-18 21:47, Logan Gunthorpe wrote:
> Hi Lu,
>
> On 2020-09-11 9:21 p.m., Lu Baolu wrote:
>> Tom Murphy has almost done all the work. His latest patch series was
>> posted here.
>>
>> https://lore.kernel.org/linux-iommu/20200903201839.7327-1-murphyt7@tcd.ie/
>>
>> Thanks a lot!
>>
>> This series is a follow-up with below changes:
>>
>> 1. Add a quirk for the i915 driver issue described in Tom's cover
>> letter.
>> 2. Fix several bugs in patch "iommu: Allow the dma-iommu api to use
>> bounce buffers" to make the bounce buffer work for untrusted devices.
>> 3. Several cleanups in iommu/vt-d driver after the conversion.
>>
>
> I'm trying to test this on an old Sandy Bridge, but found that I get
> spammed with warnings on boot. I've put a sample of a few of them below.
> They all seem to be related to ioat.
>
> I had the same issue with Tom's v2 but never saw this on his v1.

I think this might have more to do with ioat being totally broken -
AFAICS it appears to allocate descriptors with a size of 2MB, but free
them with a size of 512KB. Try throwing CONFIG_DMA_API_DEBUG at it to
confirm.

Robin.

>
> Thanks,
>
> Logan
>
>
> [ 44.057877] ------------[ cut here ]------------
> [ 44.063167] WARNING: CPU: 4 PID: 84 at drivers/iommu/dma-iommu.c:496 __iommu_dma_unmap+0x115/0x130
> [ 44.073351] Modules linked in:
> [ 44.076882] CPU: 4 PID: 84 Comm: kworker/4:1 Tainted: G W 5.9.0-rc4-00006-g110da1e703a2 #216
> [ 44.087935] Hardware name: Supermicro SYS-7047GR-TRF/X9DRG-QF, BIOS 3.0a 12/05/2013
> [ 44.096650] Workqueue: events work_for_cpu_fn
> [ 44.101644] RIP: 0010:__iommu_dma_unmap+0x115/0x130
> [ 44.107225] Code: 48 8b 0c 24 48 c7 44 24 10 00 00 00 00 48 c7 44 24 18 00 00 00 00 48 c7 44 24 20 00 00 00 00 48 c7 44 24 08 ff ff ff ff eb 8d <0f> 0b e9 74 ff ff ff e8 1f 36 66 00 66 66 2e 0f 1f 84 00 00 00 00
> [ 44.128443] RSP: 0000:ffffc90002397c38 EFLAGS: 00010206
> [ 44.134413] RAX: 0000000000200000 RBX: 0000000000080000 RCX: 0000000000000000
> [ 44.144487] RDX: 0000000000000403 RSI: ffffffff82a7fb20 RDI: ffff888477804f30
> [ 44.152613] RBP: 00000000fec00000 R08: 00000000000fec00 R09: 00000000000fedff
> [ 44.160733] R10: 0000000000000002 R11: 0000000000000004 R12: ffff888270c39000
> [ 44.168861] R13: ffff888472d85ee8 R14: 0000000000080000 R15: 0000000000000000
> [ 44.176980] FS: 0000000000000000(0000) GS:ffff888479800000(0000) knlGS:0000000000000000
> [ 44.186198] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [ 44.192761] CR2: 0000000000000000 CR3: 0000000002a20001 CR4: 00000000000606e0
> [ 44.200871] Call Trace:
> [ 44.203716] ? lockdep_hardirqs_on_prepare+0xad/0x180
> [ 44.209509] iommu_dma_free+0x18/0x30
> [ 44.213734] ioat_free_chan_resources+0x19e/0x300
> [ 44.219133] ioat_dma_self_test+0x2a0/0x3d0
> [ 44.223964] ioat_pci_probe+0x60e/0x903
> [ 44.228387] local_pci_probe+0x42/0x80
> [ 44.232721] work_for_cpu_fn+0x16/0x20
> [ 44.237037] process_one_work+0x292/0x630
> [ 44.241644] ? __schedule+0x344/0x970
> [ 44.245868] worker_thread+0x227/0x3e0
> [ 44.250185] ? process_one_work+0x630/0x630
> [ 44.254989] kthread+0x136/0x150
> [ 44.258718] ? kthread_use_mm+0x100/0x100
> [ 44.263334] ret_from_fork+0x22/0x30
> [ 44.267474] irq event stamp: 1881262
> [ 44.271602] hardirqs last enabled at (1881272): [<ffffffff811b8465>] console_unlock+0x435/0x570
> [ 44.281593] hardirqs last disabled at (1881281): [<ffffffff811b845b>] console_unlock+0x42b/0x570
> [ 44.291588] softirqs last enabled at (1747140): [<ffffffff817da3e5>] ioat_cleanup+0x65/0x470
> [ 44.301285] softirqs last disabled at (1747144): [<ffffffff817d797a>] ioat_free_chan_resources+0x6a/0x300
> [ 44.312153] ---[ end trace ed0f88fd959a5a39 ]---
> [ 44.353963] ------------[ cut here ]------------
> [ 44.359291] WARNING: CPU: 4 PID: 84 at drivers/iommu/dma-iommu.c:496 __iommu_dma_unmap+0x115/0x130
> [ 44.369482] Modules linked in:
> [ 44.373030] CPU: 4 PID: 84 Comm: kworker/4:1 Tainted: G W 5.9.0-rc4-00006-g110da1e703a2 #216
> [ 44.384097] Hardware name: Supermicro SYS-7047GR-TRF/X9DRG-QF, BIOS 3.0a 12/05/2013
> [ 44.392825] Workqueue: events work_for_cpu_fn
> [ 44.397831] RIP: 0010:__iommu_dma_unmap+0x115/0x130
> [ 44.403421] Code: 48 8b 0c 24 48 c7 44 24 10 00 00 00 00 48 c7 44 24 18 00 00 00 00 48 c7 44 24 20 00 00 00 00 48 c7 44 24 08 ff ff ff ff eb 8d <0f> 0b e9 74 ff ff ff e8 1f 36 66 00 66 66 2e 0f 1f 84 00 00 00 00
> [ 44.424644] RSP: 0000:ffffc90002397c38 EFLAGS: 00010206
> [ 44.430627] RAX: 0000000000200000 RBX: 0000000000080000 RCX: 0000000000000000
> [ 44.438770] RDX: 0000000000000403 RSI: ffffffff82a7fb20 RDI: ffff888477804f30
> [ 44.446885] RBP: 00000000ffc00000 R08: 00000000000ffc00 R09: 00000000000ffdff
> [ 44.455000] R10: 0000000000000002 R11: 0000000000000004 R12: ffff888270c55000
> [ 44.463119] R13: ffff888472dc7268 R14: 0000000000080000 R15: 0000000000000000
> [ 44.471235] FS: 0000000000000000(0000) GS:ffff888479800000(0000) knlGS:0000000000000000
> [ 44.480440] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [ 44.487004] CR2: 0000000000000000 CR3: 0000000002a20001 CR4: 00000000000606e0
> [ 44.495128] Call Trace:
> [ 44.498008] iommu_dma_free+0x18/0x30
> [ 44.502230] ioat_free_chan_resources+0x19e/0x300
> [ 44.507631] ioat_dma_self_test+0x2a0/0x3d0
> [ 44.512466] ioat_pci_probe+0x60e/0x903
> [ 44.516889] local_pci_probe+0x42/0x80
> [ 44.521217] work_for_cpu_fn+0x16/0x20
> [ 44.525540] process_one_work+0x292/0x630
> [ 44.530157] ? __schedule+0x344/0x970
> [ 44.534393] worker_thread+0x227/0x3e0
> [ 44.538720] ? process_one_work+0x630/0x630
> [ 44.543531] kthread+0x136/0x150
> [ 44.547270] ? kthread_use_mm+0x100/0x100
> [ 44.551889] ret_from_fork+0x22/0x30
> [ 44.556034] irq event stamp: 2145654
> [ 44.560161] hardirqs last enabled at (2145664): [<ffffffff811b8465>] console_unlock+0x435/0x570
> [ 44.570158] hardirqs last disabled at (2145673): [<ffffffff811b845b>] console_unlock+0x42b/0x570
> [ 44.580153] softirqs last enabled at (2014254): [<ffffffff817da3e5>] ioat_cleanup+0x65/0x470
> [ 44.589854] softirqs last disabled at (2014258): [<ffffffff817d797a>] ioat_free_chan_resources+0x6a/0x300
> [ 44.600729] ---[ end trace ed0f88fd959a5a3a ]---
> [ 44.606043] ------------[ cut here ]------------
> [ 44.611331] WARNING: CPU: 4 PID: 84 at drivers/iommu/dma-iommu.c:496 __iommu_dma_unmap+0x115/0x130
> [ 44.621524] Modules linked in:
> [ 44.625050] CPU: 4 PID: 84 Comm: kworker/4:1 Tainted: G W 5.9.0-rc4-00006-g110da1e703a2 #216
> [ 44.636119] Hardware name: Supermicro SYS-7047GR-TRF/X9DRG-QF, BIOS 3.0a 12/05/2013
> [ 44.644834] Workqueue: events work_for_cpu_fn
> [ 44.649827] RIP: 0010:__iommu_dma_unmap+0x115/0x130
> [ 44.655410] Code: 48 8b 0c 24 48 c7 44 24 10 00 00 00 00 48 c7 44 24 18 00 00 00 00 48 c7 44 24 20 00 00 00 00 48 c7 44 24 08 ff ff ff ff eb 8d <0f> 0b e9 74 ff ff ff e8 1f 36 66 00 66 66 2e 0f 1f 84 00 00 00 00
> [ 44.676618] RSP: 0000:ffffc90002397c38 EFLAGS: 00010206
> [ 44.682588] RAX: 0000000000200000 RBX: 0000000000080000 RCX: 0000000000000000
> [ 44.690702] RDX: 0000000000000403 RSI: ffffffff82a7fb20 RDI: ffff888477804f30
> [ 44.698816] RBP: 00000000ffa00000 R08: 00000000000ffa00 R09: 00000000000ffbff
> [ 44.706934] R10: 0000000000000002 R11: 0000000000000004 R12: ffff888270c55000
> [ 44.715054] R13: ffff888472dc7268 R14: 0000000000080000 R15: 0000000000000000
> [ 44.723174] FS: 0000000000000000(0000) GS:ffff888479800000(0000) knlGS:0000000000000000
> [ 44.732384] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [ 44.738941] CR2: 0000000000000000 CR3: 0000000002a20001 CR4: 00000000000606e0
> [ 44.747060] Call Trace:
> [ 44.749921] ? lockdep_hardirqs_on_prepare+0xad/0x180
> [ 44.755706] iommu_dma_free+0x18/0x30
> [ 44.759931] ioat_free_chan_resources+0x19e/0x300
> [ 44.765332] ioat_dma_self_test+0x2a0/0x3d0
> [ 44.770156] ioat_pci_probe+0x60e/0x903
> [ 44.774583] local_pci_probe+0x42/0x80
> [ 44.778909] work_for_cpu_fn+0x16/0x20
> [ 44.783232] process_one_work+0x292/0x630
> [ 44.787846] ? __schedule+0x344/0x970
> [ 44.792079] worker_thread+0x227/0x3e0
> [ 44.796403] ? process_one_work+0x630/0x630
> [ 44.801205] kthread+0x136/0x150
> [ 44.804946] ? kthread_use_mm+0x100/0x100
> [ 44.809563] ret_from_fork+0x22/0x30
> [ 44.813704] irq event stamp: 2146044
> [ 44.817831] hardirqs last enabled at (2146054): [<ffffffff811b8465>] console_unlock+0x435/0x570
> [ 44.827821] hardirqs last disabled at (2146063): [<ffffffff811b845b>] console_unlock+0x42b/0x570
> [ 44.837810] softirqs last enabled at (2014254): [<ffffffff817da3e5>] ioat_cleanup+0x65/0x470
> [ 44.847503] softirqs last disabled at (2014258): [<ffffffff817d797a>] ioat_free_chan_resources+0x6a/0x300
> [ 44.858366] ---[ end trace ed0f88fd959a5a3b ]---
> [ 44.863675] ------------[ cut here ]------------
> [ 44.868969] WARNING: CPU: 4 PID: 84 at drivers/iommu/dma-iommu.c:496 __iommu_dma_unmap+0x115/0x130
> [ 44.879148] Modules linked in:
> [ 44.882689] CPU: 4 PID: 84 Comm: kworker/4:1 Tainted: G W 5.9.0-rc4-00006-g110da1e703a2 #216
> [ 44.893760] Hardware name: Supermicro SYS-7047GR-TRF/X9DRG-QF, BIOS 3.0a 12/05/2013
> [ 44.902487] Workqueue: events work_for_cpu_fn
> [ 44.907493] RIP: 0010:__iommu_dma_unmap+0x115/0x130
> [ 44.913080] Code: 48 8b 0c 24 48 c7 44 24 10 00 00 00 00 48 c7 44 24 18 00 00 00 00 48 c7 44 24 20 00 00 00 00 48 c7 44 24 08 ff ff ff ff eb 8d <0f> 0b e9 74 ff ff ff e8 1f 36 66 00 66 66 2e 0f 1f 84 00 00 00 00
> [ 44.934290] RSP: 0000:ffffc90002397c38 EFLAGS: 00010206
> [ 44.940254] RAX: 0000000000200000 RBX: 0000000000080000 RCX: 0000000000000000
> [ 44.948379] RDX: 0000000000000403 RSI: ffffffff82a7fb20 RDI: ffff888477804f30
> [ 44.956505] RBP: 00000000ff800000 R08: 00000000000ff800 R09: 00000000000ff9ff
> [ 44.964627] R10: 0000000000000002 R11: 0000000000000004 R12: ffff888270c55000
> [ 44.972748] R13: ffff888472dc7268 R14: 0000000000080000 R15: 0000000000000000
> [ 44.980871] FS: 0000000000000000(0000) GS:ffff888479800000(0000) knlGS:0000000000000000
> [ 44.990084] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [ 44.996644] CR2: 0000000000000000 CR3: 0000000002a20001 CR4: 00000000000606e0
> [ 45.004759] Call Trace:
> [ 45.007600] ? lockdep_hardirqs_on_prepare+0xad/0x180
> [ 45.013391] iommu_dma_free+0x18/0x30
> [ 45.017609] ioat_free_chan_resources+0x19e/0x300
> [ 45.022992] ioat_dma_self_test+0x2a0/0x3d0
> [ 45.027809] ioat_pci_probe+0x60e/0x903
> [ 45.032237] local_pci_probe+0x42/0x80
> [ 45.036563] work_for_cpu_fn+0x16/0x20
> [ 45.040886] process_one_work+0x292/0x630
> [ 45.045500] ? __schedule+0x344/0x970
> [ 45.049735] worker_thread+0x227/0x3e0
> [ 45.054061] ? process_one_work+0x630/0x630
> [ 45.058864] kthread+0x136/0x150
> [ 45.062597] ? kthread_use_mm+0x100/0x100
> [ 45.067200] ret_from_fork+0x22/0x30
> [ 45.071335] irq event stamp: 2146432
> [ 45.075458] hardirqs last enabled at (2146442): [<ffffffff811b8465>] console_unlock+0x435/0x570
> [ 45.085440] hardirqs last disabled at (2146451): [<ffffffff811b845b>] console_unlock+0x42b/0x570
> [ 45.095432] softirqs last enabled at (2014254): [<ffffffff817da3e5>] ioat_cleanup+0x65/0x470
> [ 45.105134] softirqs last disabled at (2014258): [<ffffffff817d797a>] ioat_free_chan_resources+0x6a/0x300
> [ 45.116004] ---[ end trace ed0f88fd959a5a3c ]---
> [ 45.121305] ------------[ cut here ]------------
> [ 45.126596] WARNING: CPU: 4 PID: 84 at drivers/iommu/dma-iommu.c:496 __iommu_dma_unmap+0x115/0x130
> [ 45.136772] Modules linked in:
> [ 45.142288] CPU: 4 PID: 84 Comm: kworker/4:1 Tainted: G W 5.9.0-rc4-00006-g110da1e703a2 #216
> [ 45.153351] Hardware name: Supermicro SYS-7047GR-TRF/X9DRG-QF, BIOS 3.0a 12/05/2013
> [ 45.162077] Workqueue: events work_for_cpu_fn
> [ 45.167074] RIP: 0010:__iommu_dma_unmap+0x115/0x130
> [ 45.172663] Code: 48 8b 0c 24 48 c7 44 24 10 00 00 00 00 48 c7 44 24 18 00 00 00 00 48 c7 44 24 20 00 00 00 00 48 c7 44 24 08 ff ff ff ff eb 8d <0f> 0b e9 74 ff ff ff e8 1f 36 66 00 66 66 2e 0f 1f 84 00 00 00 00
> [ 45.193874] RSP: 0000:ffffc90002397c38 EFLAGS: 00010206
> [ 45.199850] RAX: 0000000000200000 RBX: 0000000000080000 RCX: 0000000000000000
> [ 45.207970] RDX: 0000000000000403 RSI: ffffffff82a7fb20 RDI: ffff888477804f30
> [ 45.216095] RBP: 00000000ff600000 R08: 00000000000ff600 R09: 00000000000ff7ff
> [ 45.224207] R10: 0000000000000002 R11: 0000000000000004 R12: ffff888270c55000
> [ 45.232327] R13: ffff888472dc7268 R14: 0000000000080000 R15: 0000000000000000
> [ 45.240446] FS: 0000000000000000(0000) GS:ffff888479800000(0000) knlGS:0000000000000000
> [ 45.249662] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [ 45.256225] CR2: 0000000000000000 CR3: 0000000002a20001 CR4: 00000000000606e0
> [ 45.264344] Call Trace:
> [ 45.267205] ? lockdep_hardirqs_on_prepare+0xad/0x180
> [ 45.273003] iommu_dma_free+0x18/0x30
> [ 45.277231] ioat_free_chan_resources+0x19e/0x300
> [ 45.282631] ioat_dma_self_test+0x2a0/0x3d0
> [ 45.287457] ioat_pci_probe+0x60e/0x903
> [ 45.291894] local_pci_probe+0x42/0x80
> [ 45.296217] work_for_cpu_fn+0x16/0x20
> [ 45.300539] process_one_work+0x292/0x630
> [ 45.305162] ? __schedule+0x344/0x970
> [ 45.309399] worker_thread+0x227/0x3e0
> [ 45.313724] ? process_one_work+0x630/0x630
> [ 45.318535] kthread+0x136/0x150
> [ 45.322274] ? kthread_use_mm+0x100/0x100
> [ 45.326893] ret_from_fork+0x22/0x30
> [ 45.331034] irq event stamp: 2146822
> [ 45.335161] hardirqs last enabled at (2146832): [<ffffffff811b8465>] console_unlock+0x435/0x570
> [ 45.345154] hardirqs last disabled at (2146841): [<ffffffff811b845b>] console_unlock+0x42b/0x570
> [ 45.355150] softirqs last enabled at (2014254): [<ffffffff817da3e5>] ioat_cleanup+0x65/0x470
> [ 45.364850] softirqs last disabled at (2014258): [<ffffffff817d797a>] ioat_free_chan_resources+0x6a/0x300
> [ 45.375710] ---[ end trace ed0f88fd959a5a3d ]---
> [ 45.381018] ------------[ cut here ]------------
> [ 45.386308] WARNING: CPU: 4 PID: 84 at drivers/iommu/dma-iommu.c:496 __iommu_dma_unmap+0x115/0x130
> [ 45.396494] Modules linked in:
> [ 45.400020] CPU: 4 PID: 84 Comm: kworker/4:1 Tainted: G W 5.9.0-rc4-00006-g110da1e703a2 #216
> [ 45.411086] Hardware name: Supermicro SYS-7047GR-TRF/X9DRG-QF, BIOS 3.0a 12/05/2013
> [ 45.419810] Workqueue: events work_for_cpu_fn
> [ 45.424819] RIP: 0010:__iommu_dma_unmap+0x115/0x130
> [ 45.430406] Code: 48 8b 0c 24 48 c7 44 24 10 00 00 00 00 48 c7 44 24 18 00 00 00 00 48 c7 44 24 20 00 00 00 00 48 c7 44 24 08 ff ff ff ff eb 8d <0f> 0b e9 74 ff ff ff e8 1f 36 66 00 66 66 2e 0f 1f 84 00 00 00 00
> [ 45.451630] RSP: 0000:ffffc90002397c38 EFLAGS: 00010206
> [ 45.457610] RAX: 0000000000200000 RBX: 0000000000080000 RCX: 0000000000000000
> [ 45.465730] RDX: 0000000000000403 RSI: ffffffff82a7fb20 RDI: ffff888477804f30
> [ 45.473853] RBP: 00000000ff400000 R08: 00000000000ff400 R09: 00000000000ff5ff
> [ 45.481973] R10: 0000000000000002 R11: 0000000000000004 R12: ffff888270c55000
> [ 45.490092] R13: ffff888472dc7268 R14: 0000000000080000 R15: 0000000000000000
> [ 45.498211] FS: 0000000000000000(0000) GS:ffff888479800000(0000) knlGS:0000000000000000
> [ 45.507418] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [ 45.513969] CR2: 0000000000000000 CR3: 0000000002a20001 CR4: 00000000000606e0
> [ 45.522081] Call Trace:
> [ 45.524934] ? lockdep_hardirqs_on_prepare+0xad/0x180
> [ 45.530718] iommu_dma_free+0x18/0x30
> [ 45.534989] ioat_free_chan_resources+0x19e/0x300
> [ 45.540378] ioat_dma_self_test+0x2a0/0x3d0
> [ 45.545193] ioat_pci_probe+0x60e/0x903
> [ 45.549619] local_pci_probe+0x42/0x80
> [ 45.553940] work_for_cpu_fn+0x16/0x20
> [ 45.558258] process_one_work+0x292/0x630
> [ 45.562871] ? __schedule+0x344/0x970
> [ 45.567108] worker_thread+0x227/0x3e0
> [ 45.571434] ? process_one_work+0x630/0x630
> [ 45.576243] kthread+0x136/0x150
> [ 45.579981] ? kthread_use_mm+0x100/0x100
> [ 45.584598] ret_from_fork+0x22/0x30
> [ 45.588733] irq event stamp: 2147210
> [ 45.592860] hardirqs last enabled at (2147220): [<ffffffff811b8465>] console_unlock+0x435/0x570
> [ 45.602845] hardirqs last disabled at (2147229): [<ffffffff811b845b>] console_unlock+0x42b/0x570
> [ 45.612836] softirqs last enabled at (2014254): [<ffffffff817da3e5>] ioat_cleanup+0x65/0x470
> [ 45.622531] softirqs last disabled at (2014258): [<ffffffff817d797a>] ioat_free_chan_resources+0x6a/0x300
> [ 45.633392] ---[ end trace ed0f88fd959a5a3e ]---
> [ 45.638708] ------------[ cut here ]------------
> [ 45.644003] WARNING: CPU: 4 PID: 84 at drivers/iommu/dma-iommu.c:496 __iommu_dma_unmap+0x115/0x130
> [ 45.654191] Modules linked in:
> [ 45.657734] CPU: 4 PID: 84 Comm: kworker/4:1 Tainted: G W 5.9.0-rc4-00006-g110da1e703a2 #216
> [ 45.668807] Hardware name: Supermicro SYS-7047GR-TRF/X9DRG-QF, BIOS 3.0a 12/05/2013
> [ 45.677534] Workqueue: events work_for_cpu_fn
> [ 45.682538] RIP: 0010:__iommu_dma_unmap+0x115/0x130
> [ 45.688126] Code: 48 8b 0c 24 48 c7 44 24 10 00 00 00 00 48 c7 44 24 18 00 00 00 00 48 c7 44 24 20 00 00 00 00 48 c7 44 24 08 ff ff ff ff eb 8d <0f> 0b e9 74 ff ff ff e8 1f 36 66 00 66 66 2e 0f 1f 84 00 00 00 00
> [ 45.709343] RSP: 0000:ffffc90002397c38 EFLAGS: 00010206
> [ 45.715321] RAX: 0000000000200000 RBX: 0000000000080000 RCX: 0000000000000000
> [ 45.723440] RDX: 0000000000000403 RSI: ffffffff82a7fb20 RDI: ffff888477804f30
> [ 45.731555] RBP: 00000000ff200000 R08: 00000000000ff200 R09: 00000000000ff3ff
> [ 45.739665] R10: 0000000000000002 R11: 0000000000000004 R12: ffff888270c55000
> [ 45.747777] R13: ffff888472dc7268 R14: 0000000000080000 R15: 0000000000000000
> [ 45.755897] FS: 0000000000000000(0000) GS:ffff888479800000(0000) knlGS:0000000000000000
> [ 45.765106] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [ 45.771661] CR2: 0000000000000000 CR3: 0000000002a20001 CR4: 00000000000606e0
> [ 45.779778] Call Trace:
> [ 45.782638] ? lockdep_hardirqs_on_prepare+0xad/0x180
> [ 45.788439] iommu_dma_free+0x18/0x30
> [ 45.792664] ioat_free_chan_resources+0x19e/0x300
> [ 45.798060] ioat_dma_self_test+0x2a0/0x3d0
> [ 45.802886] ioat_pci_probe+0x60e/0x903
> [ 45.807306] local_pci_probe+0x42/0x80
> [ 45.811633] work_for_cpu_fn+0x16/0x20
> [ 45.815946] process_one_work+0x292/0x630
> [ 45.820556] ? __schedule+0x344/0x970
> [ 45.824791] worker_thread+0x227/0x3e0
> [ 45.829117] ? process_one_work+0x630/0x630
> [ 45.833969] kthread+0x136/0x150
> [ 45.837706] ? kthread_use_mm+0x100/0x100
> [ 45.842325] ret_from_fork+0x22/0x30
> [ 45.846475] irq event stamp: 2147602
> [ 45.850608] hardirqs last enabled at (2147612): [<ffffffff811b8465>] console_unlock+0x435/0x570
> [ 45.860603] hardirqs last disabled at (2147621): [<ffffffff811b845b>] console_unlock+0x42b/0x570
> [ 45.870589] softirqs last enabled at (2014254): [<ffffffff817da3e5>] ioat_cleanup+0x65/0x470
> [ 45.880293] softirqs last disabled at (2014258): [<ffffffff817d797a>] ioat_free_chan_resources+0x6a/0x300
> [ 45.891163] ---[ end trace ed0f88fd959a5a3f ]---
> [ 45.896473] ------------[ cut here ]------------
> [ 45.901762] WARNING: CPU: 4 PID: 84 at drivers/iommu/dma-iommu.c:496 __iommu_dma_unmap+0x115/0x130
> [ 45.911956] Modules linked in:
> [ 45.915503] CPU: 4 PID: 84 Comm: kworker/4:1 Tainted: G W 5.9.0-rc4-00006-g110da1e703a2 #216
> [ 45.926570] Hardware name: Supermicro SYS-7047GR-TRF/X9DRG-QF, BIOS 3.0a 12/05/2013
> [ 45.935302] Workqueue: events work_for_cpu_fn
> [ 45.940312] RIP: 0010:__iommu_dma_unmap+0x115/0x130
> [ 45.945905] Code: 48 8b 0c 24 48 c7 44 24 10 00 00 00 00 48 c7 44 24 18 00 00 00 00 48 c7 44 24 20 00 00 00 00 48 c7 44 24 08 ff ff ff ff eb 8d <0f> 0b e9 74 ff ff ff e8 1f 36 66 00 66 66 2e 0f 1f 84 00 00 00 00
> [ 45.967128] RSP: 0000:ffffc90002397c38 EFLAGS: 00010206
> [ 45.973111] RAX: 0000000000200000 RBX: 0000000000080000 RCX: 0000000000000000
> [ 45.981236] RDX: 0000000000000403 RSI: ffffffff82a7fb20 RDI: ffff888477804f30
> [ 45.989363] RBP: 00000000ff000000 R08: 00000000000ff000 R09: 00000000000ff1ff
> [ 45.997489] R10: 0000000000000002 R11: 0000000000000004 R12: ffff888270c55000
> [ 46.005613] R13: ffff888472dc7268 R14: 0000000000080000 R15: 0000000000000000
> [ 46.013738] FS: 0000000000000000(0000) GS:ffff888479800000(0000) knlGS:0000000000000000
> [ 46.022952] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [ 46.029521] CR2: 0000000000000000 CR3: 0000000002a20001 CR4: 00000000000606e0
> [ 46.037643] Call Trace:
> [ 46.040508] ? lockdep_hardirqs_on_prepare+0xad/0x180
> [ 46.046305] iommu_dma_free+0x18/0x30
> [ 46.050538] ioat_free_chan_resources+0x19e/0x300
> [ 46.055941] ioat_dma_self_test+0x2a0/0x3d0
> [ 46.060765] ioat_pci_probe+0x60e/0x903
> [ 46.065196] local_pci_probe+0x42/0x80
> [ 46.069526] work_for_cpu_fn+0x16/0x20
> [ 46.073854] process_one_work+0x292/0x630
> [ 46.078477] ? __schedule+0x344/0x970
> [ 46.082717] worker_thread+0x227/0x3e0
> [ 46.087035] ? process_one_work+0x630/0x630
> [ 46.091849] kthread+0x136/0x150
> [ 46.095594] ? kthread_use_mm+0x100/0x100
> [ 46.100218] ret_from_fork+0x22/0x30
> [ 46.104366] irq event stamp: 2147992
> [ 46.108499] hardirqs last enabled at (2148002): [<ffffffff811b8465>] console_unlock+0x435/0x570
> [ 46.120483] hardirqs last disabled at (2148011): [<ffffffff811b845b>] console_unlock+0x42b/0x570
> [ 46.130472] softirqs last enabled at (2014254): [<ffffffff817da3e5>] ioat_cleanup+0x65/0x470
> [ 46.140171] softirqs last disabled at (2014258): [<ffffffff817d797a>] ioat_free_chan_resources+0x6a/0x300
> [ 46.151034] ---[ end trace ed0f88fd959a5a40 ]---
> [ 46.156339] ------------[ cut here ]------------
> [ 46.161628] WARNING: CPU: 4 PID: 84 at drivers/iommu/dma-iommu.c:496 __iommu_dma_unmap+0x115/0x130
> [ 46.171817] Modules linked in:
> [ 46.175365] CPU: 4 PID: 84 Comm: kworker/4:1 Tainted: G W 5.9.0-rc4-00006-g110da1e703a2 #216
> [ 46.186430] Hardware name: Supermicro SYS-7047GR-TRF/X9DRG-QF, BIOS 3.0a 12/05/2013
> [ 46.195163] Workqueue: events work_for_cpu_fn
> [ 46.200173] RIP: 0010:__iommu_dma_unmap+0x115/0x130
> [ 46.205767] Code: 48 8b 0c 24 48 c7 44 24 10 00 00 00 00 48 c7 44 24 18 00 00 00 00 48 c7 44 24 20 00 00 00 00 48 c7 44 24 08 ff ff ff ff eb 8d <0f> 0b e9 74 ff ff ff e8 1f 36 66 00 66 66 2e 0f 1f 84 00 00 00 00
> [ 46.226991] RSP: 0000:ffffc90002397c38 EFLAGS: 00010206
> [ 46.232976] RAX: 0000000000200000 RBX: 0000000000080000 RCX: 0000000000000000
> [ 46.241101] RDX: 0000000000000403 RSI: ffffffff82a7fb20 RDI: ffff888477804f30
> [ 46.249226] RBP: 00000000fec00000 R08: 00000000000fec00 R09: 00000000000fedff
> [ 46.257352] R10: 0000000000000002 R11: 0000000000000004 R12: ffff888270c55000
> [ 46.265474] R13: ffff888472dc7268 R14: 0000000000080000 R15: 0000000000000000
> [ 46.273602] FS: 0000000000000000(0000) GS:ffff888479800000(0000) knlGS:0000000000000000
> [ 46.282822] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [ 46.289388] CR2: 0000000000000000 CR3: 0000000002a20001 CR4: 00000000000606e0
> [ 46.297513] Call Trace:
> [ 46.300358] ? lockdep_hardirqs_on_prepare+0xad/0x180
> [ 46.306152] iommu_dma_free+0x18/0x30
> [ 46.310379] ioat_free_chan_resources+0x19e/0x300
> [ 46.315776] ioat_dma_self_test+0x2a0/0x3d0
> [ 46.320607] ioat_pci_probe+0x60e/0x903
> [ 46.325044] local_pci_probe+0x42/0x80
> [ 46.329373] work_for_cpu_fn+0x16/0x20
> [ 46.333699] process_one_work+0x292/0x630
> [ 46.338321] ? __schedule+0x344/0x970
> [ 46.342563] worker_thread+0x227/0x3e0
> [ 46.346891] ? process_one_work+0x630/0x630
> [ 46.351704] kthread+0x136/0x150
> [ 46.355449] ? kthread_use_mm+0x100/0x100
> [ 46.360069] ret_from_fork+0x22/0x30
> [ 46.364204] irq event stamp: 2148380
> [ 46.368338] hardirqs last enabled at (2148390): [<ffffffff811b8465>] console_unlock+0x435/0x570
> [ 46.378336] hardirqs last disabled at (2148399): [<ffffffff811b845b>] console_unlock+0x42b/0x570
> [ 46.388335] softirqs last enabled at (2014254): [<ffffffff817da3e5>] ioat_cleanup+0x65/0x470
> [ 46.398040] softirqs last disabled at (2014258): [<ffffffff817d797a>] ioat_free_chan_resources+0x6a/0x300
> [ 46.408914] ---[ end trace ed0f88fd959a5a41 ]---
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