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Mike Galbraith

2018-May-10 09:10 UTC

[Nouveau] kernel spew from nouveau/ swiotlb

Greetings,

When box is earning its keep, nouveau/swiotlb grumble.. a LOT.  The
below is from master.today.

[12594.640959] nouveau 0000:01:00.0: swiotlb buffer is full (sz: 2097152 bytes)
[12594.693000] nouveau 0000:01:00.0: swiotlb buffer is full (sz: 2097152 bytes)
[12594.713787] nouveau 0000:01:00.0: swiotlb buffer is full (sz: 2097152 bytes)
[12594.743413] nouveau 0000:01:00.0: swiotlb buffer is full (sz: 2097152 bytes)
[12594.796740] nouveau 0000:01:00.0: swiotlb buffer is full (sz: 2097152 bytes)
[12607.000774] swiotlb_tbl_map_single: 54 callbacks suppressed
[12607.000776] nouveau 0000:01:00.0: swiotlb buffer is full (sz: 2097152 bytes)
[12607.347941] nouveau 0000:01:00.0: swiotlb buffer is full (sz: 2097152 bytes)
[12608.677038] nouveau 0000:01:00.0: swiotlb buffer is full (sz: 2097152 bytes)
homer:/novell/ssh # dmesg|grep 'swiotlb buffer is full'|wc -l
2052
homer:/novell/ssh # dmesg|grep 'callbacks suppressed'|wc -l
171

lib/swiotlb.c:
 573 not_found:
 574         spin_unlock_irqrestore(&io_tlb_lock, flags);
 575         if (!(attrs & DMA_ATTR_NO_WARN) && printk_ratelimit())
 576                 dev_warn(hwdev, "swiotlb buffer is full (sz: %zd
bytes)\n", size);

Does nouveau perhaps want one of those DMA_ATTR_NO_WARN thingies?

	-Mike

Mike Galbraith

2018-May-10 10:28 UTC

head link

[Nouveau] kernel spew from nouveau/ swiotlb

On Thu, 2018-05-10 at 11:10 +0200, Mike Galbraith wrote:> Greetings,
> 
> When box is earning its keep, nouveau/swiotlb grumble.. a LOT.  The
> below is from master.today.
> 
> [12594.640959] nouveau 0000:01:00.0: swiotlb buffer is full (sz: 2097152
bytes)
> [12594.693000] nouveau 0000:01:00.0: swiotlb buffer is full (sz: 2097152
bytes)
> [12594.713787] nouveau 0000:01:00.0: swiotlb buffer is full (sz: 2097152
bytes)
> [12594.743413] nouveau 0000:01:00.0: swiotlb buffer is full (sz: 2097152
bytes)
> [12594.796740] nouveau 0000:01:00.0: swiotlb buffer is full (sz: 2097152
bytes)
> [12607.000774] swiotlb_tbl_map_single: 54 callbacks suppressed
> [12607.000776] nouveau 0000:01:00.0: swiotlb buffer is full (sz: 2097152
bytes)
> [12607.347941] nouveau 0000:01:00.0: swiotlb buffer is full (sz: 2097152
bytes)
> [12608.677038] nouveau 0000:01:00.0: swiotlb buffer is full (sz: 2097152
bytes)
> homer:/novell/ssh # dmesg|grep 'swiotlb buffer is full'|wc -l
> 2052
> homer:/novell/ssh # dmesg|grep 'callbacks suppressed'|wc -l
> 171
> 
> lib/swiotlb.c:
>  573 not_found:
>  574         spin_unlock_irqrestore(&io_tlb_lock, flags);
>  575         if (!(attrs & DMA_ATTR_NO_WARN) &&
printk_ratelimit())
>  576                 dev_warn(hwdev, "swiotlb buffer is full (sz: %zd
bytes)\n", size);
> 
> Does nouveau perhaps want one of those DMA_ATTR_NO_WARN thingies?
Or should ttm perhaps always use the one on hand?  (seems to work)

---
 drivers/gpu/drm/ttm/ttm_page_alloc_dma.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/gpu/drm/ttm/ttm_page_alloc_dma.c
+++ b/drivers/gpu/drm/ttm/ttm_page_alloc_dma.c
@@ -342,7 +342,7 @@ static struct dma_page *__ttm_dma_alloc_
 	if (!d_page)
 		return NULL;
 
-	if (pool->type & IS_HUGE)
+	if (1 || pool->type & IS_HUGE)
 		attrs = DMA_ATTR_NO_WARN;
 
 	vaddr = dma_alloc_attrs(pool->dev, pool->size, &d_page->dma,

Jerome Glisse

2018-May-10 14:31 UTC

head link

[Nouveau] kernel spew from nouveau/ swiotlb

> Greetings,
> 
> When box is earning its keep, nouveau/swiotlb grumble.. a LOT.  The
> below is from master.today.
> 
> [12594.640959] nouveau 0000:01:00.0: swiotlb buffer is full (sz: 2097152
> bytes)
> [12594.693000] nouveau 0000:01:00.0: swiotlb buffer is full (sz: 2097152
> bytes)
> [12594.713787] nouveau 0000:01:00.0: swiotlb buffer is full (sz: 2097152
> bytes)
> [12594.743413] nouveau 0000:01:00.0: swiotlb buffer is full (sz: 2097152
> bytes)
> [12594.796740] nouveau 0000:01:00.0: swiotlb buffer is full (sz: 2097152
> bytes)
> [12607.000774] swiotlb_tbl_map_single: 54 callbacks suppressed
> [12607.000776] nouveau 0000:01:00.0: swiotlb buffer is full (sz: 2097152
> bytes)
> [12607.347941] nouveau 0000:01:00.0: swiotlb buffer is full (sz: 2097152
> bytes)
> [12608.677038] nouveau 0000:01:00.0: swiotlb buffer is full (sz: 2097152
> bytes)
> homer:/novell/ssh # dmesg|grep 'swiotlb buffer is full'|wc -l
> 2052
> homer:/novell/ssh # dmesg|grep 'callbacks suppressed'|wc -l
> 171
> 
> lib/swiotlb.c:
>  573 not_found:
>  574         spin_unlock_irqrestore(&io_tlb_lock, flags);
>  575         if (!(attrs & DMA_ATTR_NO_WARN) &&
printk_ratelimit())
>  576                 dev_warn(hwdev, "swiotlb buffer is full (sz: %zd
>  bytes)\n", size);
> 
> Does nouveau perhaps want one of those DMA_ATTR_NO_WARN thingies?
> 
Could you bisect ? I would love to point finger upstream to the DMA
folk who made changes to that API without testing with GPU.

Cheers,
Jérôme

Mike Galbraith

2018-May-10 15:31 UTC

head link

[Nouveau] kernel spew from nouveau/ swiotlb

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...

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(..attr)
            swiotlb_alloc_buffer(..0)  <== hm, pass zero instead of attr?
              swiotlb_tbl_map_single() gripeage

...that?

	-Mike

Mike Galbraith

2018-May-11 07:13 UTC

head link

[Nouveau] kernel spew from nouveau/ swiotlb

On Thu, 2018-05-10 at 12:28 +0200, Mike Galbraith wrote:> On Thu, 2018-05-10 at 11:10 +0200, Mike Galbraith wrote:
> > Greetings,
> > 
> > When box is earning its keep, nouveau/swiotlb grumble.. a LOT.  The
> > below is from master.today.
> > 
> > [12594.640959] nouveau 0000:01:00.0: swiotlb buffer is full (sz:
2097152 bytes)
> > [12594.693000] nouveau 0000:01:00.0: swiotlb buffer is full (sz:
2097152 bytes)
> > [12594.713787] nouveau 0000:01:00.0: swiotlb buffer is full (sz:
2097152 bytes)
> > [12594.743413] nouveau 0000:01:00.0: swiotlb buffer is full (sz:
2097152 bytes)
> > [12594.796740] nouveau 0000:01:00.0: swiotlb buffer is full (sz:
2097152 bytes)
> > [12607.000774] swiotlb_tbl_map_single: 54 callbacks suppressed
> > [12607.000776] nouveau 0000:01:00.0: swiotlb buffer is full (sz:
2097152 bytes)
> > [12607.347941] nouveau 0000:01:00.0: swiotlb buffer is full (sz:
2097152 bytes)
> > [12608.677038] nouveau 0000:01:00.0: swiotlb buffer is full (sz:
2097152 bytes)
> > homer:/novell/ssh # dmesg|grep 'swiotlb buffer is full'|wc -l
> > 2052
> > homer:/novell/ssh # dmesg|grep 'callbacks suppressed'|wc -l
> > 171
> > 
> > lib/swiotlb.c:
> >  573 not_found:
> >  574         spin_unlock_irqrestore(&io_tlb_lock, flags);
> >  575         if (!(attrs & DMA_ATTR_NO_WARN) &&
printk_ratelimit())
> >  576                 dev_warn(hwdev, "swiotlb buffer is full (sz:
%zd bytes)\n", size);
> > 
> > Does nouveau perhaps want one of those DMA_ATTR_NO_WARN thingies?
> 
> Or should ttm perhaps always use the one on hand?  (seems to work)
No it didn't, I just didn't wait long enough for spew to start...
> ---
>  drivers/gpu/drm/ttm/ttm_page_alloc_dma.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> --- a/drivers/gpu/drm/ttm/ttm_page_alloc_dma.c
> +++ b/drivers/gpu/drm/ttm/ttm_page_alloc_dma.c
> @@ -342,7 +342,7 @@ static struct dma_page *__ttm_dma_alloc_
>  	if (!d_page)
>  		return NULL;
>  
> -	if (pool->type & IS_HUGE)
> +	if (1 || pool->type & IS_HUGE)
>  		attrs = DMA_ATTR_NO_WARN;
>  
>  	vaddr = dma_alloc_attrs(pool->dev, pool->size, &d_page->dma,
While IS_HUGE is indeed false on my box, it just doesn't matter,
because when we get to either the old or the new alloc(), it calls
swiotlb_alloc_buffer(), which drops attrs passed to it on the floor,
making it unlikely that alloc() caller wishes are granted.

	-Mike

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