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Re: octeon disable SWIOTLB

To: David Daney <ddaney@caviumnetworks.com>
Subject: Re: octeon disable SWIOTLB
From: "Maciej W. Rozycki" <macro@linux-mips.org>
Date: Thu, 26 Feb 2015 22:33:21 +0000 (GMT)
Cc: dwalker@fifo99.com, linux-mips@linux-mips.org
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On Wed, 25 Feb 2015, David Daney wrote:

> > Back in 2010 you made CONFIG_SWIOTLB mandatory (commit b93b2a). This
> > prevents the Continuous
> > memory allocation from being enabled. Would you be willing to accept a patch
> > which allows
> > this option to be disabled if CONFIG_EXPERT is set?
> 
> Ralf has the final say, so it really is not up to me.
> 
> That said, any patch that improves the flexibility of the kernel without
> adversely effecting reliability and correctness would be welcome.

 So how's DMA to/from 64-bit memory supposed to be handled then for 32-bit 
PCI option cards that don't support DAC by systems that use continuous 
memory allocation (whatever that is)?  Is that a bug in continuous memory 
allocation support?

  Maciej

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