On Wed, Mar 28, 2018 at 10:06 AM, Rob Herring <robh@xxxxxxxxxx> wrote: [..] > >> Are DIMMs always going to be the only form factor for NV memory? > >> > >> And if you have multiple DIMMs, does each DT node correspond to a DIMM? > > > > A nvdimm-region might correspond to a single NVDIMM, a set of > > interleaved NVDIMMs, or it might just be a chunk of normal memory that > > you want treated as a NVDIMM for some reason. The last case is useful > > for provisioning install media on servers since it allows you do > > download a DVD image, turn it into an nvdimm-region, and kexec into > > the installer which can use it as a root disk. That may seem a little > > esoteric, but it's handy and we're using a full linux environment for > > our boot loader so it's easy to make use of. > > I'm really just asking if we should drop the "dimm" name because it is > not always a DIMM. Maybe pmem instead? I don't know, naming is > hard(TM). The Linux enabling uses the term "memory device". The Linux device object name for memory devices is "nmem". [..] > > special since the OS needs to know where it can allocate early in boot > > and I don't see non-volatile memory as being similarly significant. > > Fundamentally an NVDIMM is just a memory mapped storage device so we > > should be able to defer looking at them until later in boot. > > It's not clear if 'platform' is just an example or random name or what > the node is required to be called. In the latter case, we should be > much more specific because 'platform' could be anything. In the former > case, then we have no way to find or validate the node because the > name could be anything and there's no compatible property either. > > "region" is pretty generic too. > The term "nvdimm-region" has specific meaning to the libnvdimm sub-system. It is a contiguous physical address range backed by one or more memory devices, DIMMs, in an interleaved configuration (interleave set). One feature that is currently missing from libnvdimm is a management interface to change an interleave configuration. To date, Linux only reads a static region configuration published by platform firmware. Linux can provide dynamic provisioning of namespaces out of those regions, but interleave configuration has been left to vendor specific tooling to date. It would be great to start incorporating generic Linux support for that capability across platform firmware implementations. -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
