linux-kernel - Re: [PATCH 3/5] dma-direct: refine dma_direct

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Message-ID: <2b98d7b2-bf74-ccc9-881a-a91e2c9949c3@arm.com>
Date:   Thu, 27 Sep 2018 16:38:31 +0100
From:   Robin Murphy <robin.murphy@....com>
To:     Christoph Hellwig <hch@....de>
Cc:     iommu@...ts.linux-foundation.org,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH 3/5] dma-direct: refine dma_direct_alloc zone selection

On 27/09/18 16:30, Christoph Hellwig wrote:
> On Thu, Sep 27, 2018 at 03:30:20PM +0100, Robin Murphy wrote:
>>>    +static gfp_t __dma_direct_optimal_gfp_mask(struct device *dev, u64
>>> dma_mask,
>>> +		u64 *phys_mask)
>>> +{
>>> +	if (force_dma_unencrypted())
>>> +		*phys_mask = __dma_to_phys(dev, dma_mask);
>>> +	else
>>> +		*phys_mask = dma_to_phys(dev, dma_mask);
>>
>> Maybe make phys_to_dma_direct() take u64 instead of phys_addr_t so we can
>> reuse it here?
> 
> This is a dma_to_phys and not a phys_to_dma.

Ugh, clearly it's time to stop reviewing patches for today... sorry :(

Robin.