February 2016 - Linux-nvdimm

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4 years, 11 months

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LSF/MM ATTEND (resend)] Persistent Memory Error Handling

by Vishal Verma

[ Resending because my original email was caught in spam filters ] Hi, I'd like to attend LSF/MM. My primary topic of interest is the above as proposed by Jeff Moyer: http://www.spinics.net/lists/linux-mm/msg100560.html I wrote the initial enabling for error handling that was merged for 4.5 (Building a poison list in the libnvdimm subsystem, exposing it as 'badblocks'), and am working on subsequent improvements in this areaa. These would include making the initial poison gathering asynchronous, and finer grained DAX control instead of turning DAX off entirely in the presence of poison which we currently do. Another topic of discussion I'd like to propose within this session is to explore if there are use cases that the now-generic badblocks implementation can fit. There is at least one opportunity of consolidation between md-raid's sysfs representation of badblocks, and the generically available one in gendisk. Thanks, -Vishal

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[PATCH] ndctl: release v50

by Dan Williams

This release incorporates the capabilities of the v4.5 kernel, and adds the below features and fixes: New apis: ndctl_bus_get_ctx ndctl_namespace_get_pfn ndctl_namespace_get_mode ndctl_namespace_get_numa_node ndctl_region_get_pfn_seed ndctl_pfn_get_first ndctl_pfn_get_next ndctl_pfn_get_id ndctl_pfn_get_namespace ndctl_pfn_get_uuid ndctl_pfn_set_uuid ndctl_pfn_get_location ndctl_pfn_set_location ndctl_pfn_get_align ndctl_pfn_set_align ndctl_pfn_set_namespace ndctl_pfn_get_bus ndctl_pfn_get_ctx ndctl_pfn_get_devname ndctl_pfn_get_block_device ndctl_pfn_is_valid ndctl_pfn_is_enabled ndctl_pfn_get_region ndctl_pfn_enable ndctl_pfn_delete ndctl_pfn_is_configured New utility commands: list help (man pages) create-namespace Api fixes: ndctl_{namespace|btt}_foreach crash fix ndctl_namespace_delete no longer errors on "io" namespaces miscellaneous static analysis fixes Utility command fixes: {en|dis}able-{namespace|region} return code Signed-off-by: Dan Williams <dan.j.williams(a)intel.com> --- Makefile.am | 4 ++-- builtin-xaction-namespace.c | 2 +- git-version-gen | 2 +- lib/libndctl-ars.c | 2 +- lib/libndctl-private.h | 2 +- lib/libndctl.c | 2 +- lib/ndctl/libndctl.h | 2 +- ndctl.h | 2 +- nfit.h | 2 +- test/dax-dev.c | 2 +- test/dpa-alloc.c | 2 +- test/libndctl.c | 2 +- 12 files changed, 13 insertions(+), 13 deletions(-) diff --git a/Makefile.am b/Makefile.am index e613bc418b17..1c6a4b07f8f1 100644 --- a/Makefile.am +++ b/Makefile.am @@ -45,9 +45,9 @@ SED_PROCESS = \ %.pc: %.pc.in Makefile $(SED_PROCESS) -LIBNDCTL_CURRENT=5 +LIBNDCTL_CURRENT=6 LIBNDCTL_REVISION=0 -LIBNDCTL_AGE=2 +LIBNDCTL_AGE=0 pkginclude_HEADERS = lib/ndctl/libndctl.h lib_LTLIBRARIES = lib/libndctl.la diff --git a/builtin-xaction-namespace.c b/builtin-xaction-namespace.c index eb16aaaf5ee7..f4645d866e0f 100644 --- a/builtin-xaction-namespace.c +++ b/builtin-xaction-namespace.c @@ -1,5 +1,5 @@ /* - * Copyright(c) 2015 Intel Corporation. All rights reserved. + * Copyright(c) 2015-2016 Intel Corporation. All rights reserved. * * This program is free software; you can redistribute it and/or modify it * under the terms of version 2 of the GNU General Public License as diff --git a/git-version-gen b/git-version-gen index a12a62fd397f..9cd2ebf1407a 100755 --- a/git-version-gen +++ b/git-version-gen @@ -10,7 +10,7 @@ dirty() { } GVF=version.m4 -DEF_VER=v47 +DEF_VER=v50 LF=' ' diff --git a/lib/libndctl-ars.c b/lib/libndctl-ars.c index fd988996501d..ea3af82ca647 100644 --- a/lib/libndctl-ars.c +++ b/lib/libndctl-ars.c @@ -1,5 +1,5 @@ /* - * Copyright (c) 2014-2015, Intel Corporation. + * Copyright (c) 2014-2016, Intel Corporation. * * This program is free software; you can redistribute it and/or modify it * under the terms and conditions of the GNU Lesser General Public License, diff --git a/lib/libndctl-private.h b/lib/libndctl-private.h index d3cca9401b45..8111a555b957 100644 --- a/lib/libndctl-private.h +++ b/lib/libndctl-private.h @@ -1,5 +1,5 @@ /* - * Copyright (c) 2014-2015, Intel Corporation. + * Copyright (c) 2014-2016, Intel Corporation. * * This program is free software; you can redistribute it and/or modify it * under the terms and conditions of the GNU Lesser General Public License, diff --git a/lib/libndctl.c b/lib/libndctl.c index f6d8c51cd037..b85ae259827b 100644 --- a/lib/libndctl.c +++ b/lib/libndctl.c @@ -1,5 +1,5 @@ /* - * Copyright (c) 2014-2015, Intel Corporation. + * Copyright (c) 2014-2016, Intel Corporation. * * This program is free software; you can redistribute it and/or modify it * under the terms and conditions of the GNU Lesser General Public License, diff --git a/lib/ndctl/libndctl.h b/lib/ndctl/libndctl.h index 81f7e96b3f3d..088bb3c3d8b9 100644 --- a/lib/ndctl/libndctl.h +++ b/lib/ndctl/libndctl.h @@ -1,5 +1,5 @@ /* - * Copyright (c) 2014-2015, Intel Corporation. + * Copyright (c) 2014-2016, Intel Corporation. * * This program is free software; you can redistribute it and/or modify it * under the terms and conditions of the GNU Lesser General Public License, diff --git a/ndctl.h b/ndctl.h index 076cc92646aa..50df797f1974 100644 --- a/ndctl.h +++ b/ndctl.h @@ -1,5 +1,5 @@ /* - * Copyright (c) 2014-2015, Intel Corporation. + * Copyright (c) 2014-2016, Intel Corporation. * * This program is free software; you can redistribute it and/or modify it * under the terms and conditions of the GNU Lesser General Public License, diff --git a/nfit.h b/nfit.h index 190b906e06e9..9815d2143a9e 100644 --- a/nfit.h +++ b/nfit.h @@ -1,7 +1,7 @@ /* * NVDIMM Firmware Interface Table - NFIT * - * Copyright(c) 2013-2015 Intel Corporation. All rights reserved. + * Copyright(c) 2013-2016 Intel Corporation. All rights reserved. * * This program is free software; you can redistribute it and/or modify * it under the terms of version 2 of the GNU General Public License as diff --git a/test/dax-dev.c b/test/dax-dev.c index afc9e5211eb3..074fc9616743 100755 --- a/test/dax-dev.c +++ b/test/dax-dev.c @@ -1,5 +1,5 @@ /* - * Copyright (c) 2014-2015, Intel Corporation. + * Copyright (c) 2014-2016, Intel Corporation. * * This program is free software; you can redistribute it and/or modify it * under the terms and conditions of the GNU Lesser General Public License, diff --git a/test/dpa-alloc.c b/test/dpa-alloc.c index 2916d587ee35..87f374fe0540 100644 --- a/test/dpa-alloc.c +++ b/test/dpa-alloc.c @@ -1,5 +1,5 @@ /* - * Copyright (c) 2014-2015, Intel Corporation. + * Copyright (c) 2014-2016, Intel Corporation. * * This program is free software; you can redistribute it and/or modify it * under the terms and conditions of the GNU Lesser General Public License, diff --git a/test/libndctl.c b/test/libndctl.c index b6720ed59d95..5c26b5fdffc3 100644 --- a/test/libndctl.c +++ b/test/libndctl.c @@ -1,5 +1,5 @@ /* - * Copyright (c) 2014-2015, Intel Corporation. + * Copyright (c) 2014-2016, Intel Corporation. * * This program is free software; you can redistribute it and/or modify it * under the terms and conditions of the GNU Lesser General Public License,

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[ndctl PATCH] ndctl: fix 'make check' for common build environments

by Dan Williams

Given some versions of rpmbuild run 'make check' by default, be sure to 'skip' rather than 'fail' tests that are dependent on root priveleges, kernel dependencies, or a specific hardware/firmware platform. Reported-by: Ross Zwisler <ross.zwisler(a)linux.intel.com> Tested-by: Ross Zwisler <ross.zwisler(a)linux.intel.com> Signed-off-by: Dan Williams <dan.j.williams(a)intel.com> --- test/create.sh | 11 +++++++++++ test/pcommit.c | 2 +- 2 files changed, 12 insertions(+), 1 deletion(-) diff --git a/test/create.sh b/test/create.sh index 61ffe5fcc424..b190eccfc243 100755 --- a/test/create.sh +++ b/test/create.sh @@ -4,15 +4,26 @@ NDCTL="./ndctl" BUS="-b nfit_test.0" json2var="s/[{}\",]//g; s/:/=/g" SECTOR_SIZE="4096" +rc=77 set -e +err() { + echo "test/create: failed at line $1" + exit $rc +} + +set -e +trap 'err $LINENO' ERR + # setup (reset nfit_test dimms) modprobe nfit_test $NDCTL disable-region $BUS all $NDCTL zero-labels $BUS all $NDCTL enable-region $BUS all +rc=1 + # create pmem dev="x" json=$($NDCTL create-namespace $BUS -t pmem -m raw) diff --git a/test/pcommit.c b/test/pcommit.c index afe4fde44d22..3ef09a5074a4 100644 --- a/test/pcommit.c +++ b/test/pcommit.c @@ -54,7 +54,7 @@ int test_pcommit(void) } fclose(cpuinfo); - return ENOTSUP; + return 77; } int __attribute__((weak)) main(int argc, char *argv[])

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[PATCH v8 0/3] Machine check recovery when kernel accesses poison

by Tony Luck

This series is initially targeted at the folks doing filesystems on top of NVDIMMs. They really want to be able to return -EIO when there is a h/w error (just like spinning rust, and SSD does). I plan to use the same infrastructure to write a machine check aware "copy_from_user()" that will SIGBUS the calling application when a syscall touches poison in user space (just like we do when the application touches the poison itself). Changes V7-V8 Boris: Would be so much cleaner if we added a new field to the exception table instead of squeezing bits into the fixup field. New field added Tony: Documentation needs to be updated. Done Changes V6-V7: Boris: Why add/subtract 0x20000000? Added better comment provided by Andy Boris: Churn. Part2 changes things only introduced in part1. Merged parts 1&2 into one patch. Ingo: Missing my sign off on part1. Added. Changes V5-V6 Andy: Provoked massive re-write by providing what is now part1 of this patch series. This frees up two bits in the exception table fixup field that can be used to tag exception table entries as different "classes". This means we don't need my separate exception table fro machine checks. Also avoids duplicating fixup actions for #PF and #MC cases that were in version 5. Andy: Use C99 array initializers to tie the various class fixup functions back to the defintions of each class. Also give the functions meanningful names (not fixup_class0() etc.). Boris: Cleaned up my lousy assembly code removing many spurious 'l' modifiers on instructions. Boris: Provided some helper functions for the machine check severity calculation that make the code more readable. Boris: Have __mcsafe_copy() return a structure with the 'remaining bytes' in a separate field from the fault indicator. Boris had suggested Linux -EFAULT/-EINVAL ... but I thought it made more sense to return the exception number (X86_TRAP_MC, etc.) This finally kills off BIT(63) which has been controversial throughout all the early versions of this patch series. Changes V4-V5 Tony: Extended __mcsafe_copy() to have fixup entries for both machine check and page fault. Changes V3-V4: Andy: Simplify fixup_mcexception() by dropping used-once local variable Andy: "Reviewed-by" tag added to part1 Boris: Moved new functions to memcpy_64.S and declaration to asm/string_64.h Boris: Changed name s/mcsafe_memcpy/__mcsafe_copy/ to make it clear that this is an internal function and that return value doesn't follow memcpy() semantics. Boris: "Reviewed-by" tag added to parts 1&2 Changes V2-V3: Andy: Don't hack "regs->ax = BIT(63) | addr;" in the machine check handler. Now have better fixup code that computes the number of remaining bytes (just like page-fault fixup). Andy: #define for BIT(63). Done, plus couple of extra macros using it. Boris: Don't clutter up generic code (like mm/extable.c) with this. I moved everything under arch/x86 (the asm-generic change is a more generic #define). Boris: Dependencies for CONFIG_MCE_KERNEL_RECOVERY are too generic. I made it a real menu item with default "n". Dan Williams will use "select MCE_KERNEL_RECOVERY" from his persistent filesystem code. Boris: Simplify conditionals in mce.c by moving tolerant/kill_it checks earlier, with a skip to end if they aren't set. Boris: Miscellaneous grammar/punctuation. Fixed. Boris: Don't leak spurious __start_mcextable symbols into kernels that didn't configure MCE_KERNEL_RECOVERY. Done. Tony: New code doesn't belong in user_copy_64.S/uaccess*.h. Moved to new .S/.h files Elliott:Cacheing behavior non-optimal. Could use movntdqa, vmovntdqa or vmovntdqa on source addresses. I didn't fix this yet. Think of the current mcsafe_memcpy() as the first of several functions. This one is useful for small copies (meta-data) where the overhead of saving SSE/AVX state isn't justified. Changes V1->V2: 0-day: Reported build errors and warnings on 32-bit systems. Fixed 0-day: Reported bloat to tinyconfig. Fixed Boris: Suggestions to use extra macros to reduce code duplication in _ASM_*EXTABLE. Done Boris: Re-write "tolerant==3" check to reduce indentation level. See below. Andy: Check IP is valid before searching kernel exception tables. Done. Andy: Explain use of BIT(63) on return value from mcsafe_memcpy(). Done (added decode macros). Andy: Untangle mess of code in tail of do_machine_check() to make it clear what is going on (e.g. that we only enter the ist_begin_non_atomic() if we were called from user code, not from kernel!). Done. Tony Luck (3): x86: Expand exception table to allow new handling options x86, mce: Check for faults tagged in EXTABLE_CLASS_FAULT exception table entries x86, mce: Add __mcsafe_copy() Documentation/x86/exception-tables.txt | 34 ++++++++ arch/x86/include/asm/asm.h | 44 ++++++---- arch/x86/include/asm/string_64.h | 8 ++ arch/x86/include/asm/uaccess.h | 13 +-- arch/x86/kernel/cpu/mcheck/mce-severity.c | 32 ++++++- arch/x86/kernel/cpu/mcheck/mce.c | 71 ++++++++-------- arch/x86/kernel/kprobes/core.c | 2 +- arch/x86/kernel/traps.c | 6 +- arch/x86/kernel/x8664_ksyms_64.c | 2 + arch/x86/lib/memcpy_64.S | 133 ++++++++++++++++++++++++++++++ arch/x86/mm/extable.c | 84 ++++++++++++------- arch/x86/mm/fault.c | 2 +- scripts/sortextable.c | 30 +++++++ 13 files changed, 370 insertions(+), 91 deletions(-) -- 2.1.4

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[PATCH 0/2] Fix BTT data corruptions after crash

by Toshi Kani

Data corruption issues were observed in tests which initiated a system crash/reset while accessing BTT devices. This problem is reproducible. The BTT driver calls pmem_rw_bytes() to update data in pmem devices. This interface calls __copy_user_nocache(), which uses non-temporal stores so that the stores to pmem are persistent. __copy_user_nocache() uses non-temporal stores when a request size is 8 bytes or larger (and is aligned by 8 bytes). The BTT driver updates the BTT map table, which entry size is 4 bytes. Therefore, updates to the map table entries remain cached, and are not written to pmem after a crash. Since the BTT driver makes previous blocks free and uses them for subsequent writes, the map table ends up pointing to blocks allocated for other LBAs after a crash. Patch 1 extends __copy_user_nocache() to use non-temporal store for 4 byte copy. This patch fixes the BTT data corruption issue. Patch 2 changes arch_memcpy_to_pmem() to flush processor caches when a request is not naturally aligned or is less than 4 bytes. This is defensive change. --- Toshi Kani (2): 1/2 x86/lib/copy_user_64.S: Handle 4-byte uncached copy 2/2 pmem: Flush cache on unaligned request --- arch/x86/include/asm/pmem.h | 11 +++++++++++ arch/x86/lib/copy_user_64.S | 44 +++++++++++++++++++++++++++++++++----------- 2 files changed, 44 insertions(+), 11 deletions(-)

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Linux-nvdimm February 2016