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

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Date:   Thu, 27 Sep 2018 17:41:17 +0200
From:   Christoph Hellwig <hch@....de>
To:     Robin Murphy <robin.murphy@....com>
Cc:     Christoph Hellwig <hch@....de>, 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 Thu, Sep 27, 2018 at 04:38:31PM +0100, Robin Murphy wrote:
> 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 :(

I actually made the same mistake when writing it..

ALthough I'd really like to see some feedback from you on the arm64
swiotlb series once you had more cofee ;-)