On Fri, Apr 17, 2015 at 6:35 PM, Dan Williams <dan.j.williams@xxxxxxxxx> wrote: > Since 2010 Intel has included non-volatile memory support on a few > storage-focused platforms with a feature named ADR (Asynchronous DRAM > Refresh). These platforms were mostly targeted at custom applications > and never enjoyed standard discovery mechanisms for platform firmware > to advertise non-volatile memory capabilities. This now changes with > the publication of version 6 of the ACPI specification [1] and its > inclusion of a new table for describing platform memory capabilities. > The NVDIMM Firmware Interface Table (NFIT), along with new EFI and E820 > memory types, enumerates persistent memory ranges, memory-mapped-I/O > apertures, physical memory devices (DIMMs), and their associated > properties. > > The ND-subsystem wraps a Linux device driver model around the objects > and address boundaries defined in the specification and introduces 3 new > drivers. > > nd_pmem: NFIT enabled version of the existing 'pmem' driver [2] > nd_blk: mmio aperture method for accessing persistent storage > nd_btt: give persistent memory disk semantics (atomic sector update) > > See the documentation in patch2 for more details, and there is > supplemental documentation on pmem.io [4]. Please review, and > patches welcome... > > For kicking the tires, this release is accompanied by a userspace > management library 'ndctl' that includes unit tests (make check) for all > of the kernel ABIs. The nfit_test.ko module can be used to explore a > sample NFIT topology. > > [1]: http://www.uefi.org/sites/default/files/resources/ACPI_6.0.pdf > [2]: https://git.kernel.org/cgit/linux/kernel/git/tip/tip.git/log/?h=x86/pmem > [3]: https://github.com/pmem/ndctl > [4]: http://pmem.io/documents/ nd.git and ndctl.git trees are now up to date. I'll aim to keep nd.git non-rebasing, but what eventually goes upstream is likely to be a re-flowed patch set. ndctl.git won't rebase. nd.git: git://git.kernel.org/pub/scm/linux/kernel/git/djbw/nvdimm.git nd ndctl.git: https://github.com/pmem/ndctl.git -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
