Hi Ben,
On 06/13/2016 06:26 PM, Benjamin Herrenschmidt wrote:
I've been thinking about this a bit... it might be worthwhile adding
a dma_* call to query the approximate size of the IOMMU window, as
a way for the device to adjust its requirements dynamically.
Ok, cool; something like it was one of the options being discussed here.
What do you mean by 'approximate'? Maybe the size of 'free regions' in
the pools? -- not sure because iiuic the window size is static / 2 gig,
so didn't get why (or of what) to provide an approximation (for).
Another option would be to use a dma_attr for silencing mapping errors
which NVME could use provided it does handle them gracefully ...
Ah, that's new. Interesting. Thanks for suggestion!
--
Mauricio Faria de Oliveira
IBM Linux Technology Center
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