->rw_bytes() is a byte-aligned interface for accessing persistent memory namespaces. The primary consumer of the ->rw_bytes() interface is the BTT library. BTT is a library that converts a byte-accessible namespace into a disk with atomic sector update semantics (prevents sector tearing on crash or power loss). The sinister aspect of sector tearing is that most applications do not know they have a atomic sector dependency. At least today's disk's rarely ever tear sectors and if they do you almost certainly get a CRC error on access. NVDIMMs will always tear and always silently. BLK is a driver for NVDIMMs that provide sliding mmio windows to access persistent memory. The PMEM api defines ensures writes have hit persistent media relative to the completion of an i/o. Changes since v1 [1]: 1/ The ->rw_bytes() interface has been removed from struct block_device_operations and is now a common operation of NVDIMM namespace devices. Accordingly a BTT instance is now a libnvdimm device-model peer of a namespace rather than a stacked block device driver. The BTT is no longer a driver in its own right, instead it is a extension library used by a BLK or PMEM namespace. This clarifies the device model and reduced the core implementation by a couple hundred lines of code. (Christoph) 2/ Kill ND_MAX_REGIONS and ND_IOSTAT Kconfig options. (Christoph) 3/ Killed the access out of range check separately in PMEM, BLK, and BTT (Christoph) 4/ Kill the central helper for blk queue properties (Christoph) 5/ Added Toshi's numa patches with a change to set the numa info at device create time rather than driver probe time. 6/ Cherry picked the PMEM api. The wider arch cleanups in the full pmem-api series are too large / invasive to pick up at this late date. The keeps the pmem.c driver x86-only for one more cycle. [1]: https://lists.01.org/pipermail/linux-nvdimm/2015-June/001246.html Diffstat since v1: Documentation/nvdimm/btt.txt | 24 ++- Documentation/nvdimm/nvdimm.txt | 79 ++++---- arch/x86/Kconfig | 1 + arch/x86/include/asm/cacheflush.h | 72 +++++++ arch/x86/include/asm/io.h | 6 + drivers/acpi/nfit.c | 17 +- drivers/acpi/numa.c | 50 ++++- drivers/nvdimm/Kconfig | 56 ++---- drivers/nvdimm/Makefile | 2 +- drivers/nvdimm/blk.c | 148 +++++++------- drivers/nvdimm/btt.c | 166 ++++------------ drivers/nvdimm/btt_devs.c | 403 +++++++++++++++++--------------------- drivers/nvdimm/bus.c | 190 ++++-------------- drivers/nvdimm/core.c | 30 --- drivers/nvdimm/label.c | 5 +- drivers/nvdimm/namespace_devs.c | 252 +++++++++++++++++++----- drivers/nvdimm/nd-core.h | 47 +---- drivers/nvdimm/nd.h | 51 +++-- drivers/nvdimm/pmem.c | 185 ++++++++--------- drivers/nvdimm/region.c | 85 +------- drivers/nvdimm/region_devs.c | 182 +++++++++++++---- include/linux/acpi.h | 5 + include/linux/blkdev.h | 44 ----- include/linux/compiler.h | 2 + include/linux/libnvdimm.h | 2 + include/linux/nd.h | 63 +++++- include/linux/pmem.h | 153 +++++++++++++++ include/uapi/linux/ndctl.h | 2 - lib/Kconfig | 3 + tools/testing/nvdimm/Kbuild | 2 +- tools/testing/nvdimm/test/nfit.c | 1 + 31 files changed, 1272 insertions(+), 1056 deletions(-) create mode 100644 include/linux/pmem.h --- Dan Williams (8): libnvdimm: infrastructure for btt devices tools/testing/nvdimm: libnvdimm unit test infrastructure libnvdimm: Non-Volatile Devices libnvdimm, pmem: fix up max_hw_sectors pmem: make_request cleanups libnvdimm: enable iostat pmem: flag pmem block devices as non-rotational libnvdimm, nfit: handle unarmed dimms, mark namespaces read-only Ross Zwisler (2): libnvdimm, nfit, nd_blk: driver for BLK-mode access persistent memory arch, x86: pmem api for ensuring durability of persistent memory updates Toshi Kani (3): acpi: Add acpi_map_pxm_to_online_node() libnvdimm: Set numa_node to NVDIMM devices libnvdimm: Add sysfs numa_node to NVDIMM devices Vishal Verma (4): nd_btt: atomic sector updates fs/block_dev.c: skip rw_page if bdev has integrity libnvdimm, btt: add support for blk integrity libnvdimm, blk: add support for blk integrity Documentation/nvdimm/btt.txt | 283 ++++++ Documentation/nvdimm/nvdimm.txt | 808 ++++++++++++++++++ MAINTAINERS | 39 + arch/x86/Kconfig | 1 arch/x86/include/asm/cacheflush.h | 72 ++ arch/x86/include/asm/io.h | 6 drivers/acpi/nfit.c | 498 +++++++++++ drivers/acpi/nfit.h | 58 + drivers/acpi/numa.c | 50 + drivers/nvdimm/Kconfig | 42 + drivers/nvdimm/Makefile | 7 drivers/nvdimm/blk.c | 384 +++++++++ drivers/nvdimm/btt.c | 1479 +++++++++++++++++++++++++++++++++ drivers/nvdimm/btt.h | 185 ++++ drivers/nvdimm/btt_devs.c | 426 ++++++++++ drivers/nvdimm/bus.c | 60 + drivers/nvdimm/core.c | 69 ++ drivers/nvdimm/dimm_devs.c | 9 drivers/nvdimm/label.c | 5 drivers/nvdimm/namespace_devs.c | 295 ++++++- drivers/nvdimm/nd-core.h | 5 drivers/nvdimm/nd.h | 86 ++ drivers/nvdimm/pmem.c | 181 ++-- drivers/nvdimm/region.c | 28 + drivers/nvdimm/region_devs.c | 238 +++++ fs/block_dev.c | 4 include/linux/acpi.h | 5 include/linux/compiler.h | 2 include/linux/libnvdimm.h | 32 + include/linux/nd.h | 63 + include/linux/pmem.h | 153 +++ lib/Kconfig | 3 tools/testing/nvdimm/Kbuild | 40 + tools/testing/nvdimm/Makefile | 7 tools/testing/nvdimm/config_check.c | 15 tools/testing/nvdimm/test/Kbuild | 8 tools/testing/nvdimm/test/iomap.c | 151 +++ tools/testing/nvdimm/test/nfit.c | 1116 +++++++++++++++++++++++++ tools/testing/nvdimm/test/nfit_test.h | 29 + 39 files changed, 6759 insertions(+), 183 deletions(-) create mode 100644 Documentation/nvdimm/btt.txt create mode 100644 Documentation/nvdimm/nvdimm.txt create mode 100644 drivers/nvdimm/blk.c create mode 100644 drivers/nvdimm/btt.c create mode 100644 drivers/nvdimm/btt.h create mode 100644 drivers/nvdimm/btt_devs.c create mode 100644 include/linux/pmem.h create mode 100644 tools/testing/nvdimm/Kbuild create mode 100644 tools/testing/nvdimm/Makefile create mode 100644 tools/testing/nvdimm/config_check.c create mode 100644 tools/testing/nvdimm/test/Kbuild create mode 100644 tools/testing/nvdimm/test/iomap.c create mode 100644 tools/testing/nvdimm/test/nfit.c create mode 100644 tools/testing/nvdimm/test/nfit_test.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
