linux-kernel - add a new dma_alloc

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Message-Id: <20210301085236.947011-1-hch@lst.de>
Date:   Mon,  1 Mar 2021 09:52:30 +0100
From:   Christoph Hellwig <hch@....de>
To:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Tomasz Figa <tfiga@...omium.org>,
        Ricardo Ribalda <ribalda@...omium.org>,
        Sergey Senozhatsky <senozhatsky@...gle.com>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        iommu@...ts.linux-foundation.org
Cc:     Robin Murphy <robin.murphy@....com>, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-media@...r.kernel.org
Subject: add a new dma_alloc_noncontiguous API v3

Hi all,

this series adds the new noncontiguous DMA allocation API requested by
various media driver maintainers.

Changes since v2:
 - rebased to Linux 5.12-rc1
 - dropped one already merged patch
 - pass an attrs argument to dma_alloc_noncontigous
 - clarify the dma_vmap_noncontiguous documentation a bit
 - fix double assignments in uvcvideo

Changes since v1:
 - document that flush_kernel_vmap_range and invalidate_kernel_vmap_range
   must be called once an allocation is mapped into KVA
 - add dma-debug support
 - remove the separate dma_handle argument, and instead create fully formed
   DMA mapped scatterlists
 - use a directional allocation in uvcvideo
 - call invalidate_kernel_vmap_range from uvcvideo