On 12/28/18 9:58 AM, h...@lst.de wrote:
> On Fri, Dec 28, 2018 at 05:46:32PM +, Eugeniy Paltsev wrote:
>> What happens:
>>
>> First coherent allocation (PAL#1):
>> 1) allocate page via alloc_pages(__GFP_ZERO), got page vith paddr 0xbf2d6000
>> 2) zero it via memset [deep inside alloc_pages()]
Btw, can you try wit the very latests dma-mapping-for-next tree
which has a new fix from Thierry Reding that might be related.
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On Thu, Dec 20, 2018 at 02:39:20PM +, Eugeniy Paltsev wrote:
> > I would be really surprised if that is caused by the patch to add
> > the zeroing.
> Me too :)
>
> > Can you check which commit caused the issue by bisecting
> > from a known good baseline?
>
> Yep. At least kernel build from
On Thu, 2018-12-20 at 15:34 +0100, h...@lst.de wrote:
> On Thu, Dec 20, 2018 at 02:32:52PM +, Eugeniy Paltsev wrote:
> > Hi Christoph,
> >
> > I test kernel from your 'dma-alloc-always-zero' branch, and as
> > I can see we have DMA peripherals (like USB) broken.
>
> I would be really
On Thu, Dec 20, 2018 at 02:32:52PM +, Eugeniy Paltsev wrote:
> Hi Christoph,
>
> I test kernel from your 'dma-alloc-always-zero' branch, and as
> I can see we have DMA peripherals (like USB) broken.
I would be really surprised if that is caused by the patch to add
the zeroing. Can you check
Hi Christoph,
I test kernel from your 'dma-alloc-always-zero' branch, and as
I can see we have DMA peripherals (like USB) broken.
There are the errors example I got during USB initializing:
-->8
usb 1-1: device descriptor read/64, error
FYI, I've picked this up for dma-mapping for-next now.
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And in various places this used GFP_ZERO instead of __GFP_ZERO,
so won't compile.
The fixed version is available here:
http://git.infradead.org/users/hch/misc.git/shortlog/refs/heads/dma-alloc-always-zero
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For security reasons we already returned zeroed memory from
dma_alloc_coherent on most common platforms, but some implementation
missed out. Make sure we provide a consistent behavior.
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