[v2,0/2] fix vt-d hard lockup when hotplug ATS capable device

Message ID	20231217112904.3835559-1-haifeng.zhao@linux.intel.com (mailing list archive)
Headers	show Received: from mgamail.intel.com (mgamail.intel.com [192.55.52.93]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 5C37F31A8F; Sun, 17 Dec 2023 11:29:14 +0000 (UTC) From: Ethan Zhao <haifeng.zhao@linux.intel.com> To: bhelgaas@google.com, baolu.lu@linux.intel.com, dwmw2@infradead.org, will@kernel.org, robin.murphy@arm.com, lukas@wunner.de Cc: linux-pci@vger.kernel.org, iommu@lists.linux.dev, linux-kernel@vger.kernel.org, Ethan Zhao <haifeng.zhao@linux.intel.com> Subject: [PATCH v2 0/2] fix vt-d hard lockup when hotplug ATS capable device Date: Sun, 17 Dec 2023 06:29:02 -0500 Message-Id: <20231217112904.3835559-1-haifeng.zhao@linux.intel.com> Precedence: bulk MIME-Version: 1.0 Content-Transfer-Encoding: 8bit
Series	fix vt-d hard lockup when hotplug ATS capable device \| expand [v2,0/2] fix vt-d hard lockup when hotplug ATS capable device [v2,1/2] PCI: make pci_dev_is_disconnected() helper public for [v2,2/2] iommu/vt-d: don's issue devTLB flush request when device is disconnected

Message ID

20231217112904.3835559-1-haifeng.zhao@linux.intel.com (mailing list archive)

Headers

From: Ethan Zhao <haifeng.zhao@linux.intel.com>
To: bhelgaas@google.com,
	baolu.lu@linux.intel.com,
	dwmw2@infradead.org,
	will@kernel.org,
	robin.murphy@arm.com,
	lukas@wunner.de
Cc: linux-pci@vger.kernel.org,
	iommu@lists.linux.dev,
	linux-kernel@vger.kernel.org,
	Ethan Zhao <haifeng.zhao@linux.intel.com>
Subject: [PATCH v2 0/2] fix vt-d hard lockup when hotplug ATS capable device
Date: Sun, 17 Dec 2023 06:29:02 -0500
Message-Id: <20231217112904.3835559-1-haifeng.zhao@linux.intel.com>
Precedence: bulk
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit

Series

fix vt-d hard lockup when hotplug ATS capable device | expand

Message

Ethan Zhao Dec. 17, 2023, 11:29 a.m. UTC

This patchset is used to fix vt-d hard lockup reported when surpprise
 unplug ATS capable endpoint device connects to system via PCIe switch
 as following topology.

     +-[0000:15]-+-00.0  Intel Corporation Ice Lake Memory Map/VT-d
     |           +-00.1  Intel Corporation Ice Lake Mesh 2 PCIe
     |           +-00.2  Intel Corporation Ice Lake RAS
     |           +-00.4  Intel Corporation Device 0b23
     |           \-01.0-[16-1b]----00.0-[17-1b]--+-00.0-[18]----00.0 
                                           NVIDIA Corporation Device 2324
     |                                           +-01.0-[19]----00.0
                          Mellanox Technologies MT2910 Family [ConnectX-7]

 User brought endpoint device 19:00.0's link down by flap it's hotplug 
 capable slot 17:01.0 link control register, as sequence DLLSC response, 
 pciehp_ist() will unload device driver and power it off, durning device
 driver is unloading an iommu devTlb flush request issued to that link 
 down device, thus a long time completion/timeout waiting in interrupt
 context causes continuous hard lockup warnning and system hang.

[ 4211.433662] pcieport 0000:17:01.0: pciehp: Slot(108): Link Down
[ 4211.433664] pcieport 0000:17:01.0: pciehp: Slot(108): Card not present
[ 4223.822591] NMI watchdog: Watchdog detected hard LOCKUP on cpu 144
[ 4223.822622] CPU: 144 PID: 1422 Comm: irq/57-pciehp Kdump: loaded Tainted: G S
         OE    kernel version xxxx
[ 4223.822623] Hardware name: vendorname xxxx 666-106,
BIOS 01.01.02.03.01 05/15/2023
[ 4223.822623] RIP: 0010:qi_submit_sync+0x2c0/0x490
[ 4223.822624] Code: 48 be 00 00 00 00 00 08 00 00 49 85 74 24 20 0f 95 c1 48 8b
 57 10 83 c1 04 83 3c 1a 03 0f 84 a2 01 00 00 49 8b 04 24 8b 70 34 <40> f6 c6 1
0 74 17 49 8b 04 24 8b 80 80 00 00 00 89 c2 d3 fa 41 39
[ 4223.822624] RSP: 0018:ffffc4f074f0bbb8 EFLAGS: 00000093
[ 4223.822625] RAX: ffffc4f040059000 RBX: 0000000000000014 RCX: 0000000000000005
[ 4223.822625] RDX: ffff9f3841315800 RSI: 0000000000000000 RDI: ffff9f38401a8340
[ 4223.822625] RBP: ffff9f38401a8340 R08: ffffc4f074f0bc00 R09: 0000000000000000
[ 4223.822626] R10: 0000000000000010 R11: 0000000000000018 R12: ffff9f384005e200
[ 4223.822626] R13: 0000000000000004 R14: 0000000000000046 R15: 0000000000000004
[ 4223.822626] FS:  0000000000000000(0000) GS:ffffa237ae400000(0000)
knlGS:0000000000000000
[ 4223.822627] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 4223.822627] CR2: 00007ffe86515d80 CR3: 000002fd3000a001 CR4: 0000000000770ee0
[ 4223.822627] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 4223.822628] DR3: 0000000000000000 DR6: 00000000fffe07f0 DR7: 0000000000000400
[ 4223.822628] PKRU: 55555554
[ 4223.822628] Call Trace:
[ 4223.822628]  qi_flush_dev_iotlb+0xb1/0xd0
[ 4223.822628]  __dmar_remove_one_dev_info+0x224/0x250
[ 4223.822629]  dmar_remove_one_dev_info+0x3e/0x50
[ 4223.822629]  intel_iommu_release_device+0x1f/0x30
[ 4223.822629]  iommu_release_device+0x33/0x60
[ 4223.822629]  iommu_bus_notifier+0x7f/0x90
[ 4223.822630]  blocking_notifier_call_chain+0x60/0x90
[ 4223.822630]  device_del+0x2e5/0x420
[ 4223.822630]  pci_remove_bus_device+0x70/0x110
[ 4223.822630]  pciehp_unconfigure_device+0x7c/0x130
[ 4223.822631]  pciehp_disable_slot+0x6b/0x100
[ 4223.822631]  pciehp_handle_presence_or_link_change+0xd8/0x320
[ 4223.822631]  pciehp_ist+0x176/0x180
[ 4223.822631]  ? irq_finalize_oneshot.part.50+0x110/0x110
[ 4223.822632]  irq_thread_fn+0x19/0x50
[ 4223.822632]  irq_thread+0x104/0x190
[ 4223.822632]  ? irq_forced_thread_fn+0x90/0x90
[ 4223.822632]  ? irq_thread_check_affinity+0xe0/0xe0
[ 4223.822633]  kthread+0x114/0x130
[ 4223.822633]  ? __kthread_cancel_work+0x40/0x40
[ 4223.822633]  ret_from_fork+0x1f/0x30
[ 4223.822633] Kernel panic - not syncing: Hard LOCKUP
[ 4223.822634] CPU: 144 PID: 1422 Comm: irq/57-pciehp Kdump: loaded Tainted: G S
         OE     kernel version xxxx
[ 4223.822634] Hardware name: vendorname xxxx 666-106,
BIOS 01.01.02.03.01 05/15/2023
[ 4223.822634] Call Trace:
[ 4223.822634]  <NMI>
[ 4223.822635]  dump_stack+0x6d/0x88
[ 4223.822635]  panic+0x101/0x2d0
[ 4223.822635]  ? ret_from_fork+0x11/0x30
[ 4223.822635]  nmi_panic.cold.14+0xc/0xc
[ 4223.822636]  watchdog_overflow_callback.cold.8+0x6d/0x81
[ 4223.822636]  __perf_event_overflow+0x4f/0xf0
[ 4223.822636]  handle_pmi_common+0x1ef/0x290
[ 4223.822636]  ? __set_pte_vaddr+0x28/0x40
[ 4223.822637]  ? flush_tlb_one_kernel+0xa/0x20
[ 4223.822637]  ? __native_set_fixmap+0x24/0x30
[ 4223.822637]  ? ghes_copy_tofrom_phys+0x70/0x100
[ 4223.822637]  ? __ghes_peek_estatus.isra.16+0x49/0xa0
[ 4223.822637]  intel_pmu_handle_irq+0xba/0x2b0
[ 4223.822638]  perf_event_nmi_handler+0x24/0x40
[ 4223.822638]  nmi_handle+0x4d/0xf0
[ 4223.822638]  default_do_nmi+0x49/0x100
[ 4223.822638]  exc_nmi+0x134/0x180
[ 4223.822639]  end_repeat_nmi+0x16/0x67
[ 4223.822639] RIP: 0010:qi_submit_sync+0x2c0/0x490
[ 4223.822639] Code: 48 be 00 00 00 00 00 08 00 00 49 85 74 24 20 0f 95 c1 48 8b
 57 10 83 c1 04 83 3c 1a 03 0f 84 a2 01 00 00 49 8b 04 24 8b 70 34 <40> f6 c6 10
 74 17 49 8b 04 24 8b 80 80 00 00 00 89 c2 d3 fa 41 39
[ 4223.822640] RSP: 0018:ffffc4f074f0bbb8 EFLAGS: 00000093
[ 4223.822640] RAX: ffffc4f040059000 RBX: 0000000000000014 RCX: 0000000000000005
[ 4223.822640] RDX: ffff9f3841315800 RSI: 0000000000000000 RDI: ffff9f38401a8340
[ 4223.822641] RBP: ffff9f38401a8340 R08: ffffc4f074f0bc00 R09: 0000000000000000
[ 4223.822641] R10: 0000000000000010 R11: 0000000000000018 R12: ffff9f384005e200
[ 4223.822641] R13: 0000000000000004 R14: 0000000000000046 R15: 0000000000000004
[ 4223.822641]  ? qi_submit_sync+0x2c0/0x490
[ 4223.822642]  ? qi_submit_sync+0x2c0/0x490
[ 4223.822642]  </NMI>
[ 4223.822642]  qi_flush_dev_iotlb+0xb1/0xd0
[ 4223.822642]  __dmar_remove_one_dev_info+0x224/0x250
[ 4223.822643]  dmar_remove_one_dev_info+0x3e/0x50
[ 4223.822643]  intel_iommu_release_device+0x1f/0x30
[ 4223.822643]  iommu_release_device+0x33/0x60
[ 4223.822643]  iommu_bus_notifier+0x7f/0x90
[ 4223.822644]  blocking_notifier_call_chain+0x60/0x90
[ 4223.822644]  device_del+0x2e5/0x420
[ 4223.822644]  pci_remove_bus_device+0x70/0x110
[ 4223.822644]  pciehp_unconfigure_device+0x7c/0x130
[ 4223.822644]  pciehp_disable_slot+0x6b/0x100
[ 4223.822645]  pciehp_handle_presence_or_link_change+0xd8/0x320
[ 4223.822645]  pciehp_ist+0x176/0x180
[ 4223.822645]  ? irq_finalize_oneshot.part.50+0x110/0x110
[ 4223.822645]  irq_thread_fn+0x19/0x50
[ 4223.822646]  irq_thread+0x104/0x190
[ 4223.822646]  ? irq_forced_thread_fn+0x90/0x90
[ 4223.822646]  ? irq_thread_check_affinity+0xe0/0xe0
[ 4223.822646]  kthread+0x114/0x130
[ 4223.822647]  ? __kthread_cancel_work+0x40/0x40
[ 4223.822647]  ret_from_fork+0x1f/0x30
[ 4223.822647] Kernel Offset: 0x6400000 from 0xffffffff81000000 (relocation
range: 0xffffffff80000000-0xffffffffbfffffff)

Make a quick fix by checking the device's error_state in
devtlb_invalidation_with_pasid() to avoid sending meaningless devTLB flush
request to link down device that is set to pci_channel_io_perm_failure and
then powered off in

pciehp_ist()
   pciehp_handle_presence_or_link_change()
     pciehp_disable_slot()
       remove_board()
         pciehp_unconfigure_device()
 
safe_removal unplug doesn't trigger such issue. 
and this fix works for all supprise_removal unplug operations.

This patchset was tested by yehaorong@bytedance.com on stable-6.7rc4.


change log:

v2:
- revise commit[1] description part accoring to Lukas' suggestion.
- revise commit[2] description to clarify the issue's impact.
v1:
- https://lore.kernel.org/lkml/20231213034637.2603013-1-haifeng.zhao@linux.intel.com/T/



Thanks,
Ethan


Ethan Zhao (2):
  PCI: make pci_dev_is_disconnected() helper public for other drivers
  iommu/vt-d: don's issue devTLB flush request when device is
    disconnected

 drivers/iommu/intel/pasid.c | 21 ++++++++++++++++++++-
 drivers/pci/pci.h           |  5 -----
 include/linux/pci.h         |  5 +++++
 3 files changed, 25 insertions(+), 6 deletions(-)

Comments

Ethan Zhao Dec. 17, 2023, 11:38 a.m. UTC | #1

On 12/17/2023 7:29 PM, Ethan Zhao wrote:
>   This patchset is used to fix vt-d hard lockup reported when surpprise
>   unplug ATS capable endpoint device connects to system via PCIe switch
>   as following topology.
>
>       +-[0000:15]-+-00.0  Intel Corporation Ice Lake Memory Map/VT-d
>       |           +-00.1  Intel Corporation Ice Lake Mesh 2 PCIe
>       |           +-00.2  Intel Corporation Ice Lake RAS
>       |           +-00.4  Intel Corporation Device 0b23
>       |           \-01.0-[16-1b]----00.0-[17-1b]--+-00.0-[18]----00.0
>                                             NVIDIA Corporation Device 2324
>       |                                           +-01.0-[19]----00.0
>                            Mellanox Technologies MT2910 Family [ConnectX-7]
>
>   User brought endpoint device 19:00.0's link down by flap it's hotplug
>   capable slot 17:01.0 link control register, as sequence DLLSC response,
>   pciehp_ist() will unload device driver and power it off, durning device
>   driver is unloading an iommu devTlb flush request issued to that link
>   down device, thus a long time completion/timeout waiting in interrupt
>   context causes continuous hard lockup warnning and system hang.
>
> [ 4211.433662] pcieport 0000:17:01.0: pciehp: Slot(108): Link Down
> [ 4211.433664] pcieport 0000:17:01.0: pciehp: Slot(108): Card not present
> [ 4223.822591] NMI watchdog: Watchdog detected hard LOCKUP on cpu 144
> [ 4223.822622] CPU: 144 PID: 1422 Comm: irq/57-pciehp Kdump: loaded Tainted: G S
>           OE    kernel version xxxx
> [ 4223.822623] Hardware name: vendorname xxxx 666-106,
> BIOS 01.01.02.03.01 05/15/2023
> [ 4223.822623] RIP: 0010:qi_submit_sync+0x2c0/0x490
> [ 4223.822624] Code: 48 be 00 00 00 00 00 08 00 00 49 85 74 24 20 0f 95 c1 48 8b
>   57 10 83 c1 04 83 3c 1a 03 0f 84 a2 01 00 00 49 8b 04 24 8b 70 34 <40> f6 c6 1
> 0 74 17 49 8b 04 24 8b 80 80 00 00 00 89 c2 d3 fa 41 39
> [ 4223.822624] RSP: 0018:ffffc4f074f0bbb8 EFLAGS: 00000093
> [ 4223.822625] RAX: ffffc4f040059000 RBX: 0000000000000014 RCX: 0000000000000005
> [ 4223.822625] RDX: ffff9f3841315800 RSI: 0000000000000000 RDI: ffff9f38401a8340
> [ 4223.822625] RBP: ffff9f38401a8340 R08: ffffc4f074f0bc00 R09: 0000000000000000
> [ 4223.822626] R10: 0000000000000010 R11: 0000000000000018 R12: ffff9f384005e200
> [ 4223.822626] R13: 0000000000000004 R14: 0000000000000046 R15: 0000000000000004
> [ 4223.822626] FS:  0000000000000000(0000) GS:ffffa237ae400000(0000)
> knlGS:0000000000000000
> [ 4223.822627] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [ 4223.822627] CR2: 00007ffe86515d80 CR3: 000002fd3000a001 CR4: 0000000000770ee0
> [ 4223.822627] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> [ 4223.822628] DR3: 0000000000000000 DR6: 00000000fffe07f0 DR7: 0000000000000400
> [ 4223.822628] PKRU: 55555554
> [ 4223.822628] Call Trace:
> [ 4223.822628]  qi_flush_dev_iotlb+0xb1/0xd0
> [ 4223.822628]  __dmar_remove_one_dev_info+0x224/0x250
> [ 4223.822629]  dmar_remove_one_dev_info+0x3e/0x50
> [ 4223.822629]  intel_iommu_release_device+0x1f/0x30
> [ 4223.822629]  iommu_release_device+0x33/0x60
> [ 4223.822629]  iommu_bus_notifier+0x7f/0x90
> [ 4223.822630]  blocking_notifier_call_chain+0x60/0x90
> [ 4223.822630]  device_del+0x2e5/0x420
> [ 4223.822630]  pci_remove_bus_device+0x70/0x110
> [ 4223.822630]  pciehp_unconfigure_device+0x7c/0x130
> [ 4223.822631]  pciehp_disable_slot+0x6b/0x100
> [ 4223.822631]  pciehp_handle_presence_or_link_change+0xd8/0x320
> [ 4223.822631]  pciehp_ist+0x176/0x180
> [ 4223.822631]  ? irq_finalize_oneshot.part.50+0x110/0x110
> [ 4223.822632]  irq_thread_fn+0x19/0x50
> [ 4223.822632]  irq_thread+0x104/0x190
> [ 4223.822632]  ? irq_forced_thread_fn+0x90/0x90
> [ 4223.822632]  ? irq_thread_check_affinity+0xe0/0xe0
> [ 4223.822633]  kthread+0x114/0x130
> [ 4223.822633]  ? __kthread_cancel_work+0x40/0x40
> [ 4223.822633]  ret_from_fork+0x1f/0x30
> [ 4223.822633] Kernel panic - not syncing: Hard LOCKUP
> [ 4223.822634] CPU: 144 PID: 1422 Comm: irq/57-pciehp Kdump: loaded Tainted: G S
>           OE     kernel version xxxx
> [ 4223.822634] Hardware name: vendorname xxxx 666-106,
> BIOS 01.01.02.03.01 05/15/2023
> [ 4223.822634] Call Trace:
> [ 4223.822634]  <NMI>
> [ 4223.822635]  dump_stack+0x6d/0x88
> [ 4223.822635]  panic+0x101/0x2d0
> [ 4223.822635]  ? ret_from_fork+0x11/0x30
> [ 4223.822635]  nmi_panic.cold.14+0xc/0xc
> [ 4223.822636]  watchdog_overflow_callback.cold.8+0x6d/0x81
> [ 4223.822636]  __perf_event_overflow+0x4f/0xf0
> [ 4223.822636]  handle_pmi_common+0x1ef/0x290
> [ 4223.822636]  ? __set_pte_vaddr+0x28/0x40
> [ 4223.822637]  ? flush_tlb_one_kernel+0xa/0x20
> [ 4223.822637]  ? __native_set_fixmap+0x24/0x30
> [ 4223.822637]  ? ghes_copy_tofrom_phys+0x70/0x100
> [ 4223.822637]  ? __ghes_peek_estatus.isra.16+0x49/0xa0
> [ 4223.822637]  intel_pmu_handle_irq+0xba/0x2b0
> [ 4223.822638]  perf_event_nmi_handler+0x24/0x40
> [ 4223.822638]  nmi_handle+0x4d/0xf0
> [ 4223.822638]  default_do_nmi+0x49/0x100
> [ 4223.822638]  exc_nmi+0x134/0x180
> [ 4223.822639]  end_repeat_nmi+0x16/0x67
> [ 4223.822639] RIP: 0010:qi_submit_sync+0x2c0/0x490
> [ 4223.822639] Code: 48 be 00 00 00 00 00 08 00 00 49 85 74 24 20 0f 95 c1 48 8b
>   57 10 83 c1 04 83 3c 1a 03 0f 84 a2 01 00 00 49 8b 04 24 8b 70 34 <40> f6 c6 10
>   74 17 49 8b 04 24 8b 80 80 00 00 00 89 c2 d3 fa 41 39
> [ 4223.822640] RSP: 0018:ffffc4f074f0bbb8 EFLAGS: 00000093
> [ 4223.822640] RAX: ffffc4f040059000 RBX: 0000000000000014 RCX: 0000000000000005
> [ 4223.822640] RDX: ffff9f3841315800 RSI: 0000000000000000 RDI: ffff9f38401a8340
> [ 4223.822641] RBP: ffff9f38401a8340 R08: ffffc4f074f0bc00 R09: 0000000000000000
> [ 4223.822641] R10: 0000000000000010 R11: 0000000000000018 R12: ffff9f384005e200
> [ 4223.822641] R13: 0000000000000004 R14: 0000000000000046 R15: 0000000000000004
> [ 4223.822641]  ? qi_submit_sync+0x2c0/0x490
> [ 4223.822642]  ? qi_submit_sync+0x2c0/0x490
> [ 4223.822642]  </NMI>
> [ 4223.822642]  qi_flush_dev_iotlb+0xb1/0xd0
> [ 4223.822642]  __dmar_remove_one_dev_info+0x224/0x250
> [ 4223.822643]  dmar_remove_one_dev_info+0x3e/0x50
> [ 4223.822643]  intel_iommu_release_device+0x1f/0x30
> [ 4223.822643]  iommu_release_device+0x33/0x60
> [ 4223.822643]  iommu_bus_notifier+0x7f/0x90
> [ 4223.822644]  blocking_notifier_call_chain+0x60/0x90
> [ 4223.822644]  device_del+0x2e5/0x420
> [ 4223.822644]  pci_remove_bus_device+0x70/0x110
> [ 4223.822644]  pciehp_unconfigure_device+0x7c/0x130
> [ 4223.822644]  pciehp_disable_slot+0x6b/0x100
> [ 4223.822645]  pciehp_handle_presence_or_link_change+0xd8/0x320
> [ 4223.822645]  pciehp_ist+0x176/0x180
> [ 4223.822645]  ? irq_finalize_oneshot.part.50+0x110/0x110
> [ 4223.822645]  irq_thread_fn+0x19/0x50
> [ 4223.822646]  irq_thread+0x104/0x190
> [ 4223.822646]  ? irq_forced_thread_fn+0x90/0x90
> [ 4223.822646]  ? irq_thread_check_affinity+0xe0/0xe0
> [ 4223.822646]  kthread+0x114/0x130
> [ 4223.822647]  ? __kthread_cancel_work+0x40/0x40
> [ 4223.822647]  ret_from_fork+0x1f/0x30
> [ 4223.822647] Kernel Offset: 0x6400000 from 0xffffffff81000000 (relocation
> range: 0xffffffff80000000-0xffffffffbfffffff)
>
> Make a quick fix by checking the device's error_state in
> devtlb_invalidation_with_pasid() to avoid sending meaningless devTLB flush
> request to link down device that is set to pci_channel_io_perm_failure and
> then powered off in
>
> pciehp_ist()
>     pciehp_handle_presence_or_link_change()
>       pciehp_disable_slot()
>         remove_board()
>           pciehp_unconfigure_device()
>   
> safe_removal unplug doesn't trigger such issue.
> and this fix works for all supprise_removal unplug operations.
>
> This patchset was tested by yehaorong@bytedance.com on stable-6.7rc4.
>
>
> change log:
>
> v2:
> - revise commit[1] description part accoring to Lukas' suggestion.
> - revise commit[2] description to clarify the issue's impact.
> v1:
> - https://lore.kernel.org/lkml/20231213034637.2603013-1-haifeng.zhao@linux.intel.com/T/
>
>
>
> Thanks,
> Ethan
>
>
> Ethan Zhao (2):
>    PCI: make pci_dev_is_disconnected() helper public for other drivers
>    iommu/vt-d: don's issue devTLB flush request when device is
>      disconnected
>
>   drivers/iommu/intel/pasid.c | 21 ++++++++++++++++++++-
>   drivers/pci/pci.h           |  5 -----
>   include/linux/pci.h         |  5 +++++
>   3 files changed, 25 insertions(+), 6 deletions(-)

May I ask for more comments/concern about this quick fix/workaound ?  if 
no, could

we make those ATS capable devices SUPPRISE_REMOVAL unplug works on switch

ports via this quick fix ?



Thanks,

Ethan