[PATCH V7 08/11] drivers: acpi: Handle IOMMU lookup failure with deferred probing or error

[Sinan Kaya]

On 1/30/2017 7:22 AM, Robin Murphy wrote:
> On 29/01/17 17:53, Sinan Kaya wrote:
>> On 1/24/2017 7:37 AM, Lorenzo Pieralisi wrote:
>>> [+hanjun, tomasz, sinan]
>>>
>>> It is quite a key patchset, I would be glad if they can test on their
>>> respective platforms with IORT.
>>>
>>
>> Tested on top of 4.10-rc5.
>>
>> 1.	Platform Hidma device passed dmatest
>> 2.	Seeing some USB stalls on a platform USB device.
>> 3.	PCIe NVME drive probed and worked fine with MSI interrupts after boot.
>> 4. 	NVMe driver didn't probe following a hotplug insertion and received an
>> SMMU error event during the insertion.
> 
> What was the SMMU error - a translation/permission fault (implying the
> wrong DMA ops) or a bad STE fault (implying we totally failed to tell
> the SMMU about the device at all)?
> 

root at ubuntu:/sys/bus/pci/slots/4# echo 0 > power

[__204.698522]_iommu:_Removing_device_0003:01:00.0_from_group_0
[  204.708704] pciehp 0003:00:00.0:pcie004: Slot(4): Link Down
[  204.708723] pciehp 0003:00:00.0:pcie004: Slot(4): Link Down event ignored; already powering off

root at ubuntu:/sys/bus/pci/slots/4#

[__254.820440]_iommu:_Adding_device_0003:01:00.0_to_group_8
[  254.820599] nvme nvme0: pci function 0003:01:00.0
[  254.820621] nvme 0003:01:00.0: enabling device (0000 -> 0002)
[  261.948558] arm-smmu-v3 arm-smmu-v3.0.auto: event 0x0a received:
[  261.948561] arm-smmu-v3 arm-smmu-v3.0.auto:  0x000001000000000a
[  261.948563] arm-smmu-v3 arm-smmu-v3.0.auto:  0x0000000000000000
[  261.948564] arm-smmu-v3 arm-smmu-v3.0.auto:  0x0000000000000000
[  261.948566] arm-smmu-v3 arm-smmu-v3.0.auto:  0x0000000000000000
root at ubuntu:/sys/bus/pci/slots/4#

root at ubuntu:/sys/bus/pci/slots/4#ls /dev/nvme*
/dev/nvme0

I should have seen /dev/nvme0n1 partition here. 

> Robin.
> 
>>
>> /sys/bus/pci/slots/4 #
>> /sys/bus/pci/slots/4 # dmesg | grep nvme
>> [   14.041357] nvme nvme0: pci function 0003:01:00.0
>> [  198.399521] nvme nvme0: pci function 0003:01:00.0
>> [__198.416232]_nvme_0003:01:00.0:_enabling_device_(0000_->_0002)
>> [  264.402216] nvme nvme0: I/O 228 QID 0 timeout, disable controller
>> [  264.402313] nvme nvme0: Identify Controller failed (-4)
>> [  264.421270] nvme nvme0: Removing after probe failure status: -5
>> /sys/bus/pci/slots/4 #
>>
>>
>>
> 
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-- 
Sinan Kaya
Qualcomm Datacenter Technologies, Inc. as an affiliate of Qualcomm Technologies, Inc.
Qualcomm Technologies, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project.