linux-kernel - Re: [PATCH 15/18] dma-mapping: add a new dma_alloc

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Message-ID: <20200922085314.GI8477@alpha.franken.de>
Date:   Tue, 22 Sep 2020 10:53:14 +0200
From:   Thomas Bogendoerfer <tsbogend@...ha.franken.de>
To:     Christoph Hellwig <hch@....de>
Cc:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        "James E.J. Bottomley" <James.Bottomley@...senPartnership.com>,
        Joonyoung Shim <jy0922.shim@...sung.com>,
        Seung-Woo Kim <sw0312.kim@...sung.com>,
        Ben Skeggs <bskeggs@...hat.com>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Tomasz Figa <tfiga@...omium.org>,
        Matt Porter <mporter@...nel.crashing.org>,
        iommu@...ts.linux-foundation.org,
        Stefan Richter <stefanr@...6.in-berlin.de>,
        linux1394-devel@...ts.sourceforge.net, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-media@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-mips@...r.kernel.org,
        linux-parisc@...r.kernel.org, linux-samsung-soc@...r.kernel.org,
        nouveau@...ts.freedesktop.org, netdev@...r.kernel.org,
        linux-scsi@...r.kernel.org, linux-mm@...ck.org,
        alsa-devel@...a-project.org
Subject: Re: [PATCH 15/18] dma-mapping: add a new dma_alloc_pages API

On Tue, Sep 15, 2020 at 05:51:19PM +0200, Christoph Hellwig wrote:
> This API is the equivalent of alloc_pages, except that the returned memory
> is guaranteed to be DMA addressable by the passed in device.  The
> implementation will also be used to provide a more sensible replacement
> for DMA_ATTR_NON_CONSISTENT flag.
> 
> Additionally dma_alloc_noncoherent is switched over to use dma_alloc_pages
> as its backend.
> 
> Signed-off-by: Christoph Hellwig <hch@....de>
> ---
>  Documentation/core-api/dma-attributes.rst |  8 ---
>  arch/alpha/kernel/pci_iommu.c             |  2 +
>  arch/arm/mm/dma-mapping-nommu.c           |  2 +
>  arch/arm/mm/dma-mapping.c                 |  4 ++
>  arch/ia64/hp/common/sba_iommu.c           |  2 +
>  arch/mips/jazz/jazzdma.c                  |  7 +--
>  arch/powerpc/kernel/dma-iommu.c           |  2 +
>  arch/powerpc/platforms/ps3/system-bus.c   |  4 ++
>  arch/powerpc/platforms/pseries/vio.c      |  2 +
>  arch/s390/pci/pci_dma.c                   |  2 +
>  arch/x86/kernel/amd_gart_64.c             |  2 +
>  drivers/iommu/dma-iommu.c                 |  2 +
>  drivers/iommu/intel/iommu.c               |  4 ++
>  drivers/parisc/ccio-dma.c                 |  2 +
>  drivers/parisc/sba_iommu.c                |  2 +
>  drivers/xen/swiotlb-xen.c                 |  2 +
>  include/linux/dma-direct.h                |  5 ++
>  include/linux/dma-mapping.h               | 34 ++++++------
>  include/linux/dma-noncoherent.h           |  3 --
>  kernel/dma/direct.c                       | 52 ++++++++++++++++++-
>  kernel/dma/mapping.c                      | 63 +++++++++++++++++++++--
>  kernel/dma/ops_helpers.c                  | 35 +++++++++++++
>  kernel/dma/virt.c                         |  2 +
>  23 files changed, 206 insertions(+), 37 deletions(-)

Acked-by: Thomas Bogendoerfer <tsbogend@...ha.franken.de> (MIPS part)

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