linux-kernel - Re: [Nouveau] kernel spew from nouveau/ swiotlb

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Date:   Thu, 10 May 2018 18:30:46 +0200
From:   Mike Galbraith <efault@....de>
To:     Jerome Glisse <jglisse@...hat.com>
Cc:     nouveau <nouveau@...ts.freedesktop.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Ben Skeggs <bskeggs@...hat.com>
Subject: Re: [Nouveau] kernel spew from nouveau/ swiotlb

On Thu, 2018-05-10 at 17:31 +0200, Mike Galbraith wrote:
> On Thu, 2018-05-10 at 10:31 -0400, Jerome Glisse wrote:
> > 
> > Could you bisect ? I would love to point finger upstream to the DMA
> > folk who made changes to that API without testing with GPU.
> 
> Rummaging a bit, it might be...
> 

(unsend, whack duplicate line, munge, send;)

> nouveau_bo_new()
> ...
> ttm_dma_pool_alloc_new_pages()
>   dma_alloc_attrs()
>     ops->alloc() == x86_swiotlb_alloc_coherent()
>     x86_swiotlb_alloc_coherent() flags |= __GFP_NOWARN;
>       swiotlb_alloc_coherent(..flags)
>         swiotlb_alloc_coherent(..flags) attrs = (flags & __GFP_NOWARN) ? DMA_ATTR_NO_WARN : 0;
>           swiotlb_alloc_buffer(..attrs)
*              swiotlb_tbl_map_single(..0) passed 0 vs attrs, gripeage follows

Or something like that.