linux-kernel - Re: IOMMU vs Ryzen embedded EMMC controller

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Date:   Wed, 9 Oct 2019 21:25:00 +0200 (CEST)
From:   Jiri Kosina <jikos@...nel.org>
To:     "Shah, Nehal-bakulchandra" <nbshah@....com>
cc:     Kurt Garloff <kurt@...loff.de>, Joerg Roedel <joro@...tes.org>,
        LKML <linux-kernel@...r.kernel.org>,
        "Shah, Nehal-bakulchandra" <Nehal-bakulchandra.Shah@....com>,
        "Suthikulpanit, Suravee" <Suravee.Suthikulpanit@....com>,
        "Singh, Sandeep" <Sandeep.Singh@....com>
Subject: Re: 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