[PATCH 00/21] ND: NFIT-Defined / NVDIMM Subsystem

From: Dan Williams
Date: Fri Apr 17 2015 - 21:38:22 EST

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/

--
Dan for the NFIT driver development team Andy Rudoff, Matthew Wilcox, Ross
Zwisler, and Vishal Verma


---

Dan Williams (19):
e820, efi: add ACPI 6.0 persistent memory types
ND NFIT-Defined/NVIDIMM Subsystem
nd_acpi: initial core implementation and nfit skeleton
nd: create an 'nd_bus' from an 'nfit_desc'
nfit-test: manufactured NFITs for interface development
nd: ndctl class device, and nd bus attributes
nd: dimm devices (nfit "memory-devices")
nd: ndctl.h, the nd ioctl abi
nd_dimm: dimm driver and base nd-bus device-driver infrastructure
nd: regions (block-data-window, persistent memory, volatile memory)
nd_region: support for legacy nvdimms
nd_pmem: add NFIT support to the pmem driver
nd: add interleave-set state-tracking infrastructure
nd: namespace indices: read and validate
nd: pmem label sets and namespace instantiation.
nd: blk labels and namespace instantiation
nd: write pmem label set
nd: write blk label set
nd: infrastructure for btt devices

Ross Zwisler (1):
nd_blk: nfit blk driver

Vishal Verma (1):
nd_btt: atomic sector updates


Documentation/blockdev/btt.txt | 273 ++++++
Documentation/blockdev/nd.txt | 867 +++++++++++++++++++
MAINTAINERS | 34 +
arch/arm64/kernel/efi.c | 1
arch/ia64/kernel/efi.c | 1
arch/x86/boot/compressed/eboot.c | 4
arch/x86/include/uapi/asm/e820.h | 1
arch/x86/kernel/e820.c | 25 -
arch/x86/platform/efi/efi.c | 3
drivers/block/Kconfig | 13
drivers/block/Makefile | 2
drivers/block/nd/Kconfig | 130 +++
drivers/block/nd/Makefile | 39 +
drivers/block/nd/acpi.c | 443 ++++++++++
drivers/block/nd/blk.c | 269 ++++++
drivers/block/nd/btt.c | 1423 +++++++++++++++++++++++++++++++
drivers/block/nd/btt.h | 185 ++++
drivers/block/nd/btt_devs.c | 443 ++++++++++
drivers/block/nd/bus.c | 703 +++++++++++++++
drivers/block/nd/core.c | 963 +++++++++++++++++++++
drivers/block/nd/dimm.c | 126 +++
drivers/block/nd/dimm_devs.c | 701 +++++++++++++++
drivers/block/nd/label.c | 925 ++++++++++++++++++++
drivers/block/nd/label.h | 143 +++
drivers/block/nd/namespace_devs.c | 1697 +++++++++++++++++++++++++++++++++++++
drivers/block/nd/nd-private.h | 203 ++++
drivers/block/nd/nd.h | 310 +++++++
drivers/block/nd/nfit.h | 238 +++++
drivers/block/nd/pmem.c | 122 ++-
drivers/block/nd/region.c | 95 ++
drivers/block/nd/region_devs.c | 1196 ++++++++++++++++++++++++++
drivers/block/nd/test/Makefile | 5
drivers/block/nd/test/iomap.c | 199 ++++
drivers/block/nd/test/nfit.c | 1018 ++++++++++++++++++++++
drivers/block/nd/test/nfit_test.h | 37 +
include/linux/efi.h | 3
include/linux/nd.h | 98 ++
include/uapi/linux/Kbuild | 1
include/uapi/linux/ndctl.h | 199 ++++
39 files changed, 13102 insertions(+), 36 deletions(-)
create mode 100644 Documentation/blockdev/btt.txt
create mode 100644 Documentation/blockdev/nd.txt
create mode 100644 drivers/block/nd/Kconfig
create mode 100644 drivers/block/nd/Makefile
create mode 100644 drivers/block/nd/acpi.c
create mode 100644 drivers/block/nd/blk.c
create mode 100644 drivers/block/nd/btt.c
create mode 100644 drivers/block/nd/btt.h
create mode 100644 drivers/block/nd/btt_devs.c
create mode 100644 drivers/block/nd/bus.c
create mode 100644 drivers/block/nd/core.c
create mode 100644 drivers/block/nd/dimm.c
create mode 100644 drivers/block/nd/dimm_devs.c
create mode 100644 drivers/block/nd/label.c
create mode 100644 drivers/block/nd/label.h
create mode 100644 drivers/block/nd/namespace_devs.c
create mode 100644 drivers/block/nd/nd-private.h
create mode 100644 drivers/block/nd/nd.h
create mode 100644 drivers/block/nd/nfit.h
rename drivers/block/{pmem.c => nd/pmem.c} (68%)
create mode 100644 drivers/block/nd/region.c
create mode 100644 drivers/block/nd/region_devs.c
create mode 100644 drivers/block/nd/test/Makefile
create mode 100644 drivers/block/nd/test/iomap.c
create mode 100644 drivers/block/nd/test/nfit.c
create mode 100644 drivers/block/nd/test/nfit_test.h
create mode 100644 include/linux/nd.h
create mode 100644 include/uapi/linux/ndctl.h
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