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SubjectRe: IOMMU vs Ryzen embedded EMMC controller
On Fri, 27 Sep 2019, Shah, Nehal-bakulchandra wrote:

> >>> Do you have BAR memory allocation failures in dmesg with IOMMU on?
> >
> > No. The device is *not* treated as PCI device and I still think that
> > this is the source of the evil.
> >
> >>> Actually, sharing both working and non-working dmesg, as well as
> >>> /proc/iomem contents, would be helpful.

> >> Yes, can you please grab dmesg from a boot with iommu enabled and add
> >> 'amd_iommu_dump' to the kernel command line? That should give some
> >> hints on what is going on.
> >
> > For now I attach a dmesg and iomem from the boot with IOMMU enabled.
> > Nothing much interesting without IOMMU, sdhci-acpi there just works --
> > let me know if you still want me to send the kernel msg.
> >
> > Thanks for looking into this!
> >
>
> I have added Suravee from AMD in the mail loop. He works on IOMMU part.
> As per my understanding, it needs a patch in IOMMU driver for adding
> support of EMMC. Note that on Ryzen platform we have EMMC 5.0 as ACPI
> device.

Friendly ping ... any news here?

Thanks,

--
Jiri Kosina
SUSE Labs

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