linux-kernel - Re: [PATCH v3 0/8] Fix breakage caused by the NTB multi-port patchset

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Date:   Wed, 9 Jan 2019 12:33:37 -0700
From:   Logan Gunthorpe <logang@...tatee.com>
To:     Dave Jiang <dave.jiang@...el.com>, linux-kernel@...r.kernel.org,
        linux-ntb@...glegroups.com, Jon Mason <jdmason@...zu.us>
Cc:     Allen Hubbe <allenbh@...il.com>,
        Serge Semin <fancer.lancer@...il.com>
Subject: Re: [PATCH v3 0/8] Fix breakage caused by the NTB multi-port patchset



On 2019-01-09 12:32 p.m., Dave Jiang wrote:
>> I'm resending this because I've recently found out that the change we
>> made to use the NTB struct device in DMA allocations is wrong and
>> needs to be reverted. Turns out that, when running with an IOMMU,
>> dma_alloc_coherent() will always fail if you pass it the NTB struct
>> device. This is because the device has not been assigned an IOMMU
>> group and the Intel IOMMU at least expect the devices to be on the PCI
>> bus and be able to find a proper bus-dev-fn number through a struct
>> pci device. Therefore, we must revert the change and I've changed
>> patch 2 to do this and remove the no longer necessary DMA mask
>> adjustments.
> 
> For the revert, I think we should cc stable as well.

I agree it should go into stable too. But I thought the fixes tag would
make that happen...

Logan