The pmem api is responsible for shepherding data out to persistent media. The pmem driver uses this api, when available, to assert that data is durable by the time bio_endio() is invoked. When an architecture or cpu can not make persistence guarantees the driver warns and falls back to "best effort" implementation.
Changes since v4 [1]: 1/ Christoph asked me to pull the dangling piece of yarn [2] and the whole sweater came apart, but for the better. This finally unifies all the disparate ways archs had chosen to implement ioremap and friends, and uncovered several cases where drivers were incorrectly including <asm/io.h> instead of <linux/io.h>. 2/ Drop pmem ops and introduce a cheap arch_has_pmem_api() conditional to use at each site where a pmem api call is made (Christoph and Andy) 3/ Document the wmb(), "sfence", in the x86 implementation of arch_wmb_pmem() (Andy) 4/ Document and rename arch_sync_pmem(), now named arch_wmb_pmem(). (Andy) This has been run through a defconfig build of all archs and is exposed to the kbuild robot via nvdimm.git. [1]: https://lists.01.org/pipermail/linux-nvdimm/2015-June/001189.html [2]: https://lists.01.org/pipermail/linux-nvdimm/2015-June/001208.html --- Dan Williams (5): arch, drivers: don't include <asm/io.h> directly, use <linux/io.h> instead arch: unify ioremap prototypes and macro aliases cleanup IORESOURCE_CACHEABLE vs ioremap() devm: fix ioremap_cache() usage arch: introduce memremap_cache() and memremap_wt() Ross Zwisler (1): arch, x86: pmem api for ensuring durability of persistent memory updates arch/alpha/include/asm/io.h | 7 +- arch/arc/include/asm/io.h | 6 - arch/arm/Kconfig | 1 arch/arm/include/asm/io.h | 31 ++++++-- arch/arm/mach-clps711x/board-cdb89712.c | 2 arch/arm/mach-shmobile/pm-rcar.c | 2 arch/arm64/Kconfig | 1 arch/arm64/include/asm/io.h | 23 ++++-- arch/arm64/kernel/efi.c | 4 - arch/arm64/kernel/smp_spin_table.c | 10 +- arch/avr32/include/asm/io.h | 22 +++-- arch/avr32/mm/ioremap.c | 2 arch/cris/include/asm/io.h | 8 +- arch/cris/mm/ioremap.c | 2 arch/frv/Kconfig | 1 arch/frv/include/asm/io.h | 23 ++---- arch/hexagon/include/asm/io.h | 5 + arch/ia64/include/asm/io.h | 10 -- arch/ia64/kernel/cyclone.c | 2 arch/ia64/mm/ioremap.c | 4 - arch/m32r/include/asm/io.h | 9 +- arch/m68k/Kconfig | 1 arch/m68k/include/asm/io_mm.h | 21 +++-- arch/m68k/include/asm/io_no.h | 34 +++++--- arch/m68k/include/asm/raw_io.h | 3 - arch/m68k/mm/kmap.c | 2 arch/metag/Kconfig | 1 arch/metag/include/asm/io.h | 35 +++++---- arch/microblaze/include/asm/io.h | 6 - arch/microblaze/mm/pgtable.c | 2 arch/mips/Kconfig | 1 arch/mips/include/asm/io.h | 42 ++++------ arch/mn10300/include/asm/io.h | 10 +- arch/nios2/include/asm/io.h | 15 +--- arch/openrisc/include/asm/io.h | 3 - arch/openrisc/mm/ioremap.c | 2 arch/parisc/include/asm/io.h | 6 - arch/parisc/mm/ioremap.c | 2 arch/powerpc/Kconfig | 1 arch/powerpc/include/asm/io.h | 7 +- arch/powerpc/kernel/pci_of_scan.c | 2 arch/s390/include/asm/io.h | 8 +- arch/sh/include/asm/io.h | 9 ++ arch/sparc/include/asm/io_32.h | 7 -- arch/sparc/include/asm/io_64.h | 8 +- arch/sparc/kernel/ioport.c | 2 arch/sparc/kernel/pci.c | 3 - arch/tile/include/asm/io.h | 17 +++- arch/unicore32/include/asm/io.h | 25 +++++- arch/x86/Kconfig | 2 arch/x86/include/asm/cacheflush.h | 71 +++++++++++++++++ arch/x86/include/asm/io.h | 15 +++- arch/x86/kernel/crash_dump_64.c | 6 + arch/x86/kernel/kdebugfs.c | 8 +- arch/x86/kernel/ksysfs.c | 28 +++---- arch/x86/mm/ioremap.c | 10 +- arch/xtensa/Kconfig | 1 arch/xtensa/include/asm/io.h | 13 ++- drivers/acpi/apei/einj.c | 8 +- drivers/acpi/apei/erst.c | 4 - drivers/block/Kconfig | 1 drivers/block/pmem.c | 46 ++++++++++- drivers/firmware/google/memconsole.c | 4 - drivers/isdn/icn/icn.h | 2 drivers/mtd/devices/slram.c | 2 drivers/mtd/nand/diskonchip.c | 2 drivers/mtd/onenand/generic.c | 2 drivers/net/ethernet/sfc/io.h | 2 drivers/pci/probe.c | 3 - drivers/pnp/manager.c | 2 drivers/scsi/aic94xx/aic94xx_init.c | 7 -- drivers/scsi/arcmsr/arcmsr_hba.c | 5 - drivers/scsi/mvsas/mv_init.c | 15 +--- drivers/scsi/sun3x_esp.c | 2 drivers/staging/comedi/drivers/ii_pci20kc.c | 1 drivers/tty/serial/8250/8250_core.c | 2 drivers/video/fbdev/ocfb.c | 1 drivers/video/fbdev/s1d13xxxfb.c | 3 - drivers/video/fbdev/stifb.c | 1 include/asm-generic/iomap.h | 8 -- include/linux/compiler.h | 2 include/linux/device.h | 5 + include/linux/io-mapping.h | 2 include/linux/io.h | 64 ++++++++++++++++ include/linux/mtd/map.h | 2 include/linux/pmem.h | 110 +++++++++++++++++++++++++++ include/video/vga.h | 2 kernel/resource.c | 41 ++++++++++ lib/Kconfig | 8 ++ lib/devres.c | 48 +++++------- lib/pci_iomap.c | 7 -- 91 files changed, 684 insertions(+), 334 deletions(-) create mode 100644 include/linux/pmem.h -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in Please read the FAQ at http://www.tux.org/lkml/
