Changes since v1 [1]: 1/ Rebased on the accepted cleanups to the memremap() api and the NUMA hints for devm allocations. (see libnvdimm-for-next [2]). 2/ Rebased on DAX fixes from Ross [3], currently in -mm, and Dave [4], applied locally for now. 3/ Renamed __pfn_t to pfn_t and converted KVM and UM accordingly (Dave Hansen) 4/ Make pfn-to-pfn_t conversions a nop (binary identical) for typical mapped pfns (Dave Hansen) 5/ Fixed up the devm_memremap_pages() api to require passing in a percpu_ref object. Addresses a crash reported-by Logan. 6/ Moved the back pointer from a page to its hosting 'struct dev_pagemap' to share storage with the 'lru' field rather than 'mapping'. Enables us to revoke mappings at devm_memunmap_page() time and addresses a crash reported-by Logan. 7/ Rework dax_map_bh() into dax_map_atomic() to avoid proliferating buffer_head usage deeper into the dax implementation. Also addresses a crash reported by Logan (Dave Chinner) 8/ Include an initial, only lightly tested, implementation of revoking usages of ZONE_DEVICE pages when the driver disables the pmem device. This coordinates with blk_cleanup_queue() for the pmem gendisk, see patch 19. 9/ Include a cleaned up version of the vmem_altmap infrastructure allowing the struct page memmap to optionally be allocated from pmem itself. [1]: https://lists.01.org/pipermail/linux-nvdimm/2015-September/002199.html [2]: https://git.kernel.org/cgit/linux/kernel/git/nvdimm/nvdimm.git/log/?h=libnvdimm-for-next [3]: https://git.kernel.org/cgit/linux/kernel/git/nvdimm/nvdimm.git/commit/?h=dax-fixes&id=93fdde069dce [4]: https://lists.01.org/pipermail/linux-nvdimm/2015-October/002286.html --- To date, we have implemented two I/O usage models for persistent memory, PMEM (a persistent "ram disk") and DAX (mmap persistent memory into userspace). This series adds a third, DAX-GUP, that allows DAX mappings to be the target of direct-i/o. It allows userspace to coordinate DMA/RDMA from/to persitent memory. The implementation leverages the ZONE_DEVICE mm-zone that went into 4.3-rc1 to flag pages that are owned and dynamically mapped by a device driver. The pmem driver, after mapping a persistent memory range into the system memmap via devm_memremap_pages(), arranges for DAX to distinguish pfn-only versus page-backed pmem-pfns via flags in the new __pfn_t type. The DAX code, upon seeing a PFN_DEV+PFN_MAP flagged pfn, flags the resulting pte(s) inserted into the process page tables with a new _PAGE_DEVMAP flag. Later, when get_user_pages() is walking ptes it keys off _PAGE_DEVMAP to pin the device hosting the page range active. Finally, get_page() and put_page() are modified to take references against the device driver established page mapping. This series is available via git here: git://git.kernel.org/pub/scm/linux/kernel/git/djbw/nvdimm libnvdimm-pending --- Dan Williams (20): block: generic request_queue reference counting dax: increase granularity of dax_clear_blocks() operations block, dax: fix lifetime of in-kernel dax mappings with dax_map_atomic() mm: introduce __get_dev_pagemap() x86, mm: introduce vmem_altmap to augment vmemmap_populate() libnvdimm, pfn, pmem: allocate memmap array in persistent memory avr32: convert to asm-generic/memory_model.h hugetlb: fix compile error on tile frv: fix compiler warning from definition of __pmd() um: kill pfn_t kvm: rename pfn_t to kvm_pfn_t mips: fix PAGE_MASK definition mm, dax, pmem: introduce pfn_t mm, dax, gpu: convert vm_insert_mixed to pfn_t, introduce _PAGE_DEVMAP mm, dax: convert vmf_insert_pfn_pmd() to pfn_t list: introduce list_poison() and LIST_POISON3 mm, dax, pmem: introduce {get|put}_dev_pagemap() for dax-gup block: notify queue death confirmation mm, pmem: devm_memunmap_pages(), truncate and unmap ZONE_DEVICE pages mm, x86: get_user_pages() for dax mappings arch/alpha/include/asm/pgtable.h | 1 arch/arm/include/asm/kvm_mmu.h | 5 - arch/arm/kvm/mmu.c | 10 + arch/arm64/include/asm/kvm_mmu.h | 3 arch/avr32/include/asm/page.h | 8 - arch/frv/include/asm/page.h | 2 arch/ia64/include/asm/pgtable.h | 1 arch/m68k/include/asm/page_mm.h | 1 arch/m68k/include/asm/page_no.h | 1 arch/mips/include/asm/kvm_host.h | 6 - arch/mips/include/asm/page.h | 2 arch/mips/kvm/emulate.c | 2 arch/mips/kvm/tlb.c | 14 + arch/parisc/include/asm/pgtable.h | 1 arch/powerpc/include/asm/kvm_book3s.h | 4 arch/powerpc/include/asm/kvm_ppc.h | 2 arch/powerpc/include/asm/pgtable.h | 1 arch/powerpc/kvm/book3s.c | 6 - arch/powerpc/kvm/book3s_32_mmu_host.c | 2 arch/powerpc/kvm/book3s_64_mmu_host.c | 2 arch/powerpc/kvm/e500.h | 2 arch/powerpc/kvm/e500_mmu_host.c | 8 - arch/powerpc/kvm/trace_pr.h | 2 arch/powerpc/sysdev/axonram.c | 8 - arch/sparc/include/asm/pgtable_64.h | 2 arch/tile/include/asm/pgtable.h | 1 arch/um/include/asm/page.h | 6 - arch/um/include/asm/pgtable-3level.h | 5 - arch/um/include/asm/pgtable.h | 2 arch/x86/include/asm/pgtable.h | 24 ++ arch/x86/include/asm/pgtable_types.h | 7 + arch/x86/kvm/iommu.c | 11 + arch/x86/kvm/mmu.c | 37 ++-- arch/x86/kvm/mmu_audit.c | 2 arch/x86/kvm/paging_tmpl.h | 6 - arch/x86/kvm/vmx.c | 2 arch/x86/kvm/x86.c | 2 arch/x86/mm/gup.c | 56 +++++- arch/x86/mm/init_64.c | 32 +++ arch/x86/mm/pat.c | 4 block/blk-core.c | 79 +++++++- block/blk-mq-sysfs.c | 6 - block/blk-mq.c | 87 +++------ block/blk-sysfs.c | 3 block/blk.h | 12 + drivers/block/brd.c | 4 drivers/gpu/drm/exynos/exynos_drm_gem.c | 3 drivers/gpu/drm/gma500/framebuffer.c | 3 drivers/gpu/drm/msm/msm_gem.c | 3 drivers/gpu/drm/omapdrm/omap_gem.c | 6 - drivers/gpu/drm/ttm/ttm_bo_vm.c | 3 drivers/nvdimm/pfn_devs.c | 3 drivers/nvdimm/pmem.c | 128 +++++++++---- drivers/s390/block/dcssblk.c | 10 - fs/block_dev.c | 2 fs/dax.c | 199 +++++++++++++-------- include/asm-generic/pgtable.h | 6 - include/linux/blk-mq.h | 1 include/linux/blkdev.h | 12 + include/linux/huge_mm.h | 2 include/linux/hugetlb.h | 1 include/linux/io.h | 17 -- include/linux/kvm_host.h | 37 ++-- include/linux/kvm_types.h | 2 include/linux/list.h | 14 + include/linux/memory_hotplug.h | 3 include/linux/mm.h | 300 +++++++++++++++++++++++++++++-- include/linux/mm_types.h | 5 + include/linux/pfn.h | 9 + include/linux/poison.h | 1 kernel/memremap.c | 187 +++++++++++++++++++ lib/list_debug.c | 2 mm/gup.c | 11 + mm/huge_memory.c | 10 + mm/hugetlb.c | 18 ++ mm/memory.c | 17 +- mm/memory_hotplug.c | 66 +++++-- mm/page_alloc.c | 10 + mm/sparse-vmemmap.c | 37 ++++ mm/sparse.c | 8 + mm/swap.c | 15 ++ virt/kvm/kvm_main.c | 47 ++--- 82 files changed, 1264 insertions(+), 418 deletions(-) -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. 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