linux-kernel - Re: [PATCH v4 03/14] PCI/P2PDMA: Add PCI p2pmem dma mappings to adjust the bus offset

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Message-ID: <20180507230208.GF161390@bhelgaas-glaptop.roam.corp.google.com>
Date:   Mon, 7 May 2018 18:02:08 -0500
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     Logan Gunthorpe <logang@...tatee.com>
Cc:     linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
        linux-nvme@...ts.infradead.org, linux-rdma@...r.kernel.org,
        linux-nvdimm@...ts.01.org, linux-block@...r.kernel.org,
        Stephen Bates <sbates@...thlin.com>,
        Christoph Hellwig <hch@....de>, Jens Axboe <axboe@...nel.dk>,
        Keith Busch <keith.busch@...el.com>,
        Sagi Grimberg <sagi@...mberg.me>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Jason Gunthorpe <jgg@...lanox.com>,
        Max Gurtovoy <maxg@...lanox.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Jérôme Glisse <jglisse@...hat.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Alex Williamson <alex.williamson@...hat.com>,
        Christian König <christian.koenig@....com>
Subject: Re: [PATCH v4 03/14] PCI/P2PDMA: Add PCI p2pmem dma mappings to
 adjust the bus offset

s/dma/DMA/ (in subject)

On Mon, Apr 23, 2018 at 05:30:35PM -0600, Logan Gunthorpe wrote:
> The DMA address used when mapping PCI P2P memory must be the PCI bus
> address. Thus, introduce pci_p2pmem_[un]map_sg() to map the correct
> addresses when using P2P memory.
> 
> For this, we assume that an SGL passed to these functions contain all
> P2P memory or no P2P memory.
> 
> Signed-off-by: Logan Gunthorpe <logang@...tatee.com>