linux-kernel - Re: [PATCH v3 10/20] nvme-pci: convert to using dma_map

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Message-ID: <f38472e5-1273-140c-9177-299f09330c2a@nvidia.com>
Date:   Wed, 6 Oct 2021 01:29:17 +0300
From:   Max Gurtovoy <mgurtovoy@...dia.com>
To:     Logan Gunthorpe <logang@...tatee.com>,
        <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>
CC:     Stephen Bates <sbates@...thlin.com>,
        Christoph Hellwig <hch@....de>,
        "Dan Williams" <dan.j.williams@...el.com>,
        Jason Gunthorpe <jgg@...pe.ca>,
        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 10/20] nvme-pci: convert to using dma_map_sgtable()

Logan,

On 9/17/2021 2:40 AM, Logan Gunthorpe wrote:
> The dma_map operations now support P2PDMA pages directly. So remove
> the calls to pci_p2pdma_[un]map_sg_attrs() and replace them with calls
> to dma_map_sgtable().
>
> dma_map_sgtable() returns more complete error codes than dma_map_sg()
> and allows differentiating EREMOTEIO errors in case an unsupported
> P2PDMA transfer is requested. When this happens, return BLK_STS_TARGET
> so the request isn't retried.
>
> Signed-off-by: Logan Gunthorpe <logang@...tatee.com>
> ---
>   drivers/nvme/host/pci.c | 69 +++++++++++++++++------------------------
>   1 file changed, 29 insertions(+), 40 deletions(-)

Looks good,

Reviewed-by: Max Gurtovoy <mgurtovoy@...dia.com>