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

[Robin Murphy]

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)?

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 #
> 
> 
>