linux-kernel - Re: [PATCH 2/6] s390: enable ARCH_HAS_PHYS_TO

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Message-ID: <49deb7fa-a0a5-4ace-b3cc-1d07e0d273b4@linux.ibm.com>
Date: Tue, 10 Dec 2024 16:23:20 -0500
From: Matthew Rosato <mjrosato@...ux.ibm.com>
To: Christoph Hellwig <hch@...radead.org>
Cc: joro@...tes.org, will@...nel.org, robin.murphy@....com,
        gerald.schaefer@...ux.ibm.com, schnelle@...ux.ibm.com,
        hca@...ux.ibm.com, gor@...ux.ibm.com, agordeev@...ux.ibm.com,
        svens@...ux.ibm.com, borntraeger@...ux.ibm.com, farman@...ux.ibm.com,
        clegoate@...hat.com, iommu@...ts.linux.dev,
        linux-kernel@...r.kernel.org, linux-s390@...r.kernel.org
Subject: Re: [PATCH 2/6] s390: enable ARCH_HAS_PHYS_TO_DMA

On 12/9/24 11:33 PM, Christoph Hellwig wrote:
> On Mon, Dec 09, 2024 at 02:23:59PM -0500, Matthew Rosato wrote:
>> PCI devices on s390 have a DMA offset that is reported via CLP.  In
>> preparation for allowing identity domains, enable ARCH_HAS_PHYS_TO_DMA
>> for s390 and get the dma offset for all PCI devices from the reported
>> CLP value.
> 
> Nothing new should select ARCH_HAS_PHYS_TO_DMA, please fill out the
> bus_dma_region attached to the device instead.
> 

OK, thanks for the pointer.  I think I've got it converted, will test some more and include this change in next version.