linux-kernel - Re: [PATCH] swiotlb: Fix unexpected swiotlb_alloc

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Message-ID: <20180410181020.GA28565@lst.de>
Date:   Tue, 10 Apr 2018 20:10:20 +0200
From:   Christoph Hellwig <hch@....de>
To:     Robin Murphy <robin.murphy@....com>
Cc:     Takashi Iwai <tiwai@...e.de>, Christoph Hellwig <hch@....de>,
        linux-kernel@...r.kernel.org, iommu@...ts.linux-foundation.org,
        Christian König <christian.koenig@....com>,
        Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Subject: Re: [PATCH] swiotlb: Fix unexpected swiotlb_alloc_coherent()
        failures

On Tue, Apr 10, 2018 at 06:50:04PM +0100, Robin Murphy wrote:
> In the first one, the machine appears to have enough RAM that most of it is 
> beyond the device's 36-bit DMA mask, thus it's fairly likely for the 
> initial direct alloc to come back with something unsuitable.

But we should try a GFP_DMA32 allocation first, so this is a bit
surprising.