Re: [PATCH 11/33] dma-mapping: move swiotlb arch helpers to a new header
From: Robin Murphy
Date: Wed Jan 10 2018 - 09:56:11 EST
On 10/01/18 08:00, Christoph Hellwig wrote:
phys_to_dma, dma_to_phys and dma_capable are helpers published by
architecture code for use of swiotlb and xen-swiotlb only. Drivers are
not supposed to use these directly, but use the DMA API instead.
Move these to a new asm/dma-direct.h helper, included by a
linux/dma-direct.h wrapper that provides the default linear mapping
unless the architecture wants to override it.
Signed-off-by: Christoph Hellwig <hch@xxxxxx>
---
[...]
drivers/crypto/marvell/cesa.c | 1 +
drivers/mtd/nand/qcom_nandc.c | 1 +
I took a look at these, and it seems their phys_to_dma() usage is doing
the thing which we subsequently formalised as dma_map_resource(). I've
had a crack at a quick patch to update the CESA driver; qcom_nandc looks
slightly more complex in that the changes probably need to span the BAM
dmaengine driver as well.
In the process, though, I stumbled across gen_pool_dma_alloc() - yuck,
something needs doing there, for sure...
Robin.
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