On 15/04/17 04:17 PM, Benjamin Herrenschmidt wrote:
> You can't. If the iommu is on, everything is remapped. Or do you mean
> to have dma_map_* not do a remapping ?
Well, yes, you'd have to change the code so that iomem pages do not get
remapped and the raw BAR address is passed to the DMA engin
On 15/04/17 09:01 PM, Benjamin Herrenschmidt wrote:
> Are ZONE_DEVICE pages identifiable based on the struct page alone ? (a
> flag ?)
Well you can't use ZONE_DEVICE as an indicator. They may be regular RAM,
(eg. pmem). It would need a separate flag indicating it is backed by iomem.
Logan
_
On Sat, 2017-04-15 at 15:09 -0700, Dan Williams wrote:
> I'm wondering, since this is limited to support behind a single
> switch, if you could have a software-iommu hanging off that switch
> device object that knows how to catch and translate the non-zero
> offset bus address case. We have somethi
On Sat, 2017-04-15 at 11:41 -0600, Logan Gunthorpe wrote:
> Thanks, Benjamin, for the summary of some of the issues.
>
> On 14/04/17 04:07 PM, Benjamin Herrenschmidt wrote
> > So I assume the p2p code provides a way to address that too via special
> > dma_ops ? Or wrappers ?
>
> Not at this time.
On Sat, Apr 15, 2017 at 10:41 AM, Logan Gunthorpe wrote:
> Thanks, Benjamin, for the summary of some of the issues.
>
> On 14/04/17 04:07 PM, Benjamin Herrenschmidt wrote
>> So I assume the p2p code provides a way to address that too via special
>> dma_ops ? Or wrappers ?
>
> Not at this time. We
Thanks, Benjamin, for the summary of some of the issues.
On 14/04/17 04:07 PM, Benjamin Herrenschmidt wrote
> So I assume the p2p code provides a way to address that too via special
> dma_ops ? Or wrappers ?
Not at this time. We will probably need a way to ensure the iommus do
not attempt to rema
Hi Linus, please pull from:
git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm libnvdimm-fixes
...to receive:
A small crop of lockdep, sleeping while atomic, and other fixes /
band-aids in advance of the full-blown reworks targeting the next
merge window. The largest change here is "l
[ adding some missing cc's ]
Cover letter patch here:
https://lists.01.org/pipermail/linux-nvdimm/2017-April/009648.html
On Fri, Apr 14, 2017 at 7:34 PM, Dan Williams wrote:
> Allocate a dax_device to represent the capacity of a device-mapper
> instance. Provide a ->direct_access() method via th
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