linux-kernel - Re: [PATCH v3 05/20] dma-mapping: allow EREMOTEIO return code for P2PDMA transfers

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Message-ID: <20210928185755.GM3544071@ziepe.ca>
Date:   Tue, 28 Sep 2021 15:57:55 -0300
From:   Jason Gunthorpe <jgg@...pe.ca>
To:     Logan Gunthorpe <logang@...tatee.com>
Cc:     linux-kernel@...r.kernel.org, linux-nvme@...ts.infradead.org,
        linux-block@...r.kernel.org, linux-pci@...r.kernel.org,
        linux-mm@...ck.org, iommu@...ts.linux-foundation.org,
        Stephen Bates <sbates@...thlin.com>,
        Christoph Hellwig <hch@....de>,
        Dan Williams <dan.j.williams@...el.com>,
        Christian König <christian.koenig@....com>,
        John Hubbard <jhubbard@...dia.com>,
        Don Dutile <ddutile@...hat.com>,
        Matthew Wilcox <willy@...radead.org>,
        Daniel Vetter <daniel.vetter@...ll.ch>,
        Jakowski Andrzej <andrzej.jakowski@...el.com>,
        Minturn Dave B <dave.b.minturn@...el.com>,
        Jason Ekstrand <jason@...kstrand.net>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Xiong Jianxin <jianxin.xiong@...el.com>,
        Bjorn Helgaas <helgaas@...nel.org>,
        Ira Weiny <ira.weiny@...el.com>,
        Robin Murphy <robin.murphy@....com>,
        Martin Oliveira <martin.oliveira@...eticom.com>,
        Chaitanya Kulkarni <ckulkarnilinux@...il.com>
Subject: Re: [PATCH v3 05/20] dma-mapping: allow EREMOTEIO return code for
 P2PDMA transfers

On Thu, Sep 16, 2021 at 05:40:45PM -0600, Logan Gunthorpe wrote:
> Add EREMOTEIO error return to dma_map_sgtable() which will be used
> by .map_sg() implementations that detect P2PDMA pages that the
> underlying DMA device cannot access.
> 
> Signed-off-by: Logan Gunthorpe <logang@...tatee.com>
> ---
>  kernel/dma/mapping.c | 16 +++++++++-------
>  1 file changed, 9 insertions(+), 7 deletions(-)

Reviewed-by: Jason Gunthorpe <jgg@...dia.com>

Jason