> On Jan 19, 2021, at 9:11 PM, Lu Baolu <baolu.lu@xxxxxxxxxxxxxxx> wrote:
>
> On 1/19/21 10:37 PM, Chuck Lever wrote:
>>> On Jan 18, 2021, at 8:22 PM, Lu Baolu <baolu.lu@xxxxxxxxxxxxxxx> wrote:
>>>
>>> Do you mind posting the cap and ecap of the iommu used by your device?
>>>
>>> You can get it via sysfs, for example:
>>>
>>> /sys/bus/pci/devices/0000:00:14.0/iommu/intel-iommu# ls
>>> address cap domains_supported domains_used ecap version
>> [root@manet intel-iommu]# lspci | grep Mellanox
>> 03:00.0 Network controller: Mellanox Technologies MT27520 Family [ConnectX-3 Pro]
>> [root@manet intel-iommu]# pwd
>> /sys/devices/pci0000:00/0000:00:03.0/0000:03:00.0/iommu/intel-iommu
>> [root@manet intel-iommu]# for i in *; do echo -n $i ": "; cat $i; done
>> address : c7ffc000
>> cap : d2078c106f0466
>
> MGAW: 101111 (supporting 48-bit address width)
> SAGAW: 00100 (supporting 48-bit 4-level page table)
>
> So the calculation of domain->domain.geometry.aperture_end is right.
I found the cause of the performance loss with c062db039f40: it was
a testing error on my part. I will begin looking at c588072bba6b
("iommu/vt-d: Convert intel iommu driver to the iommu ops").
--
Chuck Lever
