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

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Message-ID: <Z1fEj_6beeRdGpJL@infradead.org>
Date: Mon, 9 Dec 2024 20:33:19 -0800
From: Christoph Hellwig <hch@...radead.org>
To: Matthew Rosato <mjrosato@...ux.ibm.com>
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 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.