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 -- 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
