linux-kernel - Re: "iommu/vt-d: Delegate DMA domain to generic iommu" series breaks megaraid

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Message-Id: <AB191BD9-239D-4962-AED3-52AABED5C7C0@lca.pw>
Date:   Tue, 11 Jun 2019 10:00:02 -0400
From:   Qian Cai <cai@....pw>
To:     Lu Baolu <baolu.lu@...ux.intel.com>
Cc:     James Sewart <jamessewart@...sta.com>,
        Joerg Roedel <jroedel@...e.de>,
        iommu@...ts.linux-foundation.org,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Kashyap Desai <kashyap.desai@...adcom.com>,
        Sumit Saxena <sumit.saxena@...adcom.com>,
        Shivasharan S <shivasharan.srikanteshwara@...adcom.com>
Subject: Re: "iommu/vt-d: Delegate DMA domain to generic iommu" series breaks
 megaraid_sas



> On Jun 10, 2019, at 9:41 PM, Lu Baolu <baolu.lu@...ux.intel.com> wrote:
> 
> Ah, good catch!
> 
> The device failed to be attached by a DMA domain. Can you please try the
> attached fix patch?

It works fine.

> 
> [  101.885468] pci 0000:06:00.0: DMAR: Device is ineligible for IOMMU
> domain attach due to platform RMRR requirement.  Contact your platform
> vendor.
> [  101.900801] pci 0000:06:00.0: Failed to add to iommu group 23: -1
> 
> Best regards,
> Baolu
> 
> On 6/10/19 10:54 PM, Qian Cai wrote:
>> On Mon, 2019-06-10 at 09:44 -0400, Qian Cai wrote:
>>> On Sun, 2019-06-09 at 10:43 +0800, Lu Baolu wrote:
>>>> Hi Qian,
>>>> 
>>>> I just posted some fix patches. I cc'ed them in your email inbox as
>>>> well. Can you please check whether they happen to fix your issue?
>>>> If not, do you mind posting more debug messages?
>>> 
>>> Unfortunately, it does not work. Here is the dmesg.
>>> 
>>> https://raw.githubusercontent.com/cailca/tmp/master/dmesg?token=AMC35QKPIZBYUM
>>> FUQKLW4ZC47ZPIK
>> This one should be good to view.
>> https://cailca.github.io/files/dmesg.txt
> <0001-iommu-vt-d-Allow-DMA-domain-attaching-to-rmrr-locked.patch>