This series adds a new PMEM API consisting of three functions: persistent_copy(), persistent_flush() and persistent_sync(). These three functions are then used in the I/O paths for both the ND_BLK driver and the PMEM driver to ensure that writes actually make it to the DIMM and become durable before the I/O operation completes. The first two patches in the series are just cleanup and correctness patches. Patch three provides a reasonable architecture neutral default implementation for these three APIs for architectures that do not implement the PMEM API. These defaults allow all architectures to mostly work, aliasing persistent_copy() to memcpy() and having persistent_flush() and persistent_sync() be noops. With this patch set this implementation is provided at the pmem.h level. It's possible that other future consumers of the PMEM API (DAX, possibly others) would prefer to have a different default behavior for architectures that don't support the PMEM API. If this is the case we could move the choice about what to do for those architectures down into consumer-specific header files, so nd.h for libnd, for example. If DAX and other consumers are fine with our defaults it's nicer to keep them common and in a global place. Please let us know how other future consumers of the PMEM API feel about this. Patches 5 and 6 update the I/O paths for flush hints and NVDIMM flags. This series applies cleanly to Dan's "ndctl-for-next" tree: https://git.kernel.org/cgit/linux/kernel/git/djbw/nvdimm.git/log/?h=libnd-for-next One last note - I'm going to be unavailable soon, so patch feedback will most likely be handled by Dan Williams. Thanks, Dan. :) Ross Zwisler (6): pmem: add force casts to avoid __iomem annotation nfit: Fix up address spaces, sparse warnings x86, pmem: add PMEM API for persistent memory pmem, nd_blk: update I/O paths to use PMEM API nd_blk: add support for flush hints nd_blk: add support for NVDIMM flags MAINTAINERS | 1 + arch/x86/Kconfig | 3 ++ arch/x86/include/asm/cacheflush.h | 23 ++++++++++ drivers/acpi/nfit.c | 89 ++++++++++++++++++++++++++++++++++----- drivers/acpi/nfit.h | 28 +++++++++++- drivers/block/nd/pmem.c | 22 +++++++--- include/linux/pmem.h | 79 ++++++++++++++++++++++++++++++++++ include/uapi/linux/ndctl.h | 5 +++ 8 files changed, 232 insertions(+), 18 deletions(-) create mode 100644 include/linux/pmem.h -- 1.9.3 -- 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
