linux-kernel - Re: Phyr Starter

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Message-ID: <20220120152858.GA13263@lst.de>
Date:   Thu, 20 Jan 2022 16:28:58 +0100
From:   Christoph Hellwig <hch@....de>
To:     Keith Busch <kbusch@...nel.org>
Cc:     Christoph Hellwig <hch@....de>, Jason Gunthorpe <jgg@...dia.com>,
        Matthew Wilcox <willy@...radead.org>,
        linux-kernel@...r.kernel.org,
        Joao Martins <joao.m.martins@...cle.com>,
        John Hubbard <jhubbard@...dia.com>,
        Logan Gunthorpe <logang@...tatee.com>,
        Ming Lei <ming.lei@...hat.com>, linux-block@...r.kernel.org,
        netdev@...r.kernel.org, linux-mm@...ck.org,
        linux-rdma@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        nvdimm@...ts.linux.dev
Subject: Re: Phyr Starter

On Thu, Jan 20, 2022 at 07:27:36AM -0800, Keith Busch wrote:
> It doesn't look like IOMMU page sizes are exported, or even necessarily
> consistently sized on at least one arch (power).

At the DMA API layer dma_get_merge_boundary is the API for it.