Re: [PATCH v6 05/11] drivers: of: add automated assignment of reserved regions to client devices

[Grant Likely]

On Wed, 14 May 2014 10:15:38 +0100, "Jon Medhurst (Tixy)" <tixy@xxxxxxxxxx> wrote:
> On Sun, 2014-03-02 at 13:40 +0800, Grant Likely wrote:
> > On Fri, 28 Feb 2014 14:42:50 +0100, Marek Szyprowski <m.szyprowski@xxxxxxxxxxx> wrote:
> > > This patch adds code for automated assignment of reserved memory regions
> > > to struct device. reserved_mem->ops->device_init()/device_cleanup()
> > > callbacks are called to perform reserved memory driver specific
> > > initialization and cleanup
> > > 
> > > Based on previous code provided by Josh Cartwright <joshc@xxxxxxxxxxxxxx>
> > > 
> > > Signed-off-by: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>
> > 
> > Hi Marek,
> > 
> > I've not applied this one yet, only because there is still the open
> > issue of whether or not these functions should be called from drivers or
> > from core code. I don't actually have any problems with the content of
> > this patch. Once the user is sorted out I'll merge it.
> 
> Has anything more come of these patches? I see some of the series is now
> in Linux 3.15, but the actual patches to let people use the feature
> aren't there yet, namely patches 5 though 8.
> 
> My personal immediate interest in these is as a mechanism on arm64 to
> limit CMA to a region of memory that is actually DMA-able devices (e.g.
> below 4GB for 32-bit devices without an iommu).
> 
> For reference, the mail archives for this series is at
> http://lkml.org/lkml/2014/2/28/237

IIRC, the issue I have with patch 5-8 is that I don't like the driver core
going off and doing automagical things to attach regions to devices.
I've not seen any more discussion on this topic since I merged the
patches I was okay with, but I may have missed something.

g.

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