Eric Lee / smarc-fsl-linux-kernel

11 Apr, 2016

1 commit

  • 8ee26530b   powerpc/eeh: rename EEH from "extended" to "enhanced" error handling ... Browse Code »

    IBM online documentation for EEH uses "extended error handling" and
    "enhanced error handling" to refer to the same thing, in different
    places. The only place mentioning it as "enhanced error handling" in the
    kernel is the MAINTAINERS file, and it's "extended" in some documentation.

    IBM originally defined EEH as "enhanced error handling", so standardise
    all mentions of EEH to use that term.

    Signed-off-by: Russell Currey
    Acked-by: Gavin Shan
    Signed-off-by: Michael Ellerman

    Russell Currey
     

09 Mar, 2016

1 commit

  • 594ff7d06   cxl: Support to flash a new image on the adapter from a guest ... Browse Code »

    The new flash.c file contains the logic to flash a new image on the
    adapter, through a hcall. It is an iterative process, with chunks of
    data of 1M at a time. There are also 2 phases: write and verify. The
    flash operation itself is driven from a user-land tool.
    Once flashing is successful, an rtas call is made to update the device
    tree with the new properties values for the adapter and the AFU(s)

    Add a new char device for the adapter, so that the flash tool can
    access the card, even if there is no valid AFU on it.

    Co-authored-by: Frederic Barrat
    Signed-off-by: Frederic Barrat
    Signed-off-by: Christophe Lombard
    Reviewed-by: Manoj Kumar
    Acked-by: Ian Munsie
    Signed-off-by: Michael Ellerman

    Christophe Lombard
     

03 Sep, 2015

1 commit

  • df910390e   Merge tag 'scsi-misc' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi ... Browse Code »

    Pull first round of SCSI updates from James Bottomley:
    "This includes one new driver: cxlflash plus the usual grab bag of
    updates for the major drivers: qla2xxx, ipr, storvsc, pm80xx, hptiop,
    plus a few assorted fixes.

    There's another tranch coming, but I want to incubate it another few
    days in the checkers, plus it includes a mpt2sas separated lifetime
    fix, which Avago won't get done testing until Friday"

    * tag 'scsi-misc' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi: (85 commits)
    aic94xx: set an error code on failure
    storvsc: Set the error code correctly in failure conditions
    storvsc: Allow write_same when host is windows 10
    storvsc: use storage protocol version to determine storage capabilities
    storvsc: use correct defaults for values determined by protocol negotiation
    storvsc: Untangle the storage protocol negotiation from the vmbus protocol negotiation.
    storvsc: Use a single value to track protocol versions
    storvsc: Rather than look for sets of specific protocol versions, make decisions based on ranges.
    cxlflash: Remove unused variable from queuecommand
    cxlflash: shift wrapping bug in afu_link_reset()
    cxlflash: off by one bug in cxlflash_show_port_status()
    cxlflash: Virtual LUN support
    cxlflash: Superpipe support
    cxlflash: Base error recovery support
    qla2xxx: Update driver version to 8.07.00.26-k
    qla2xxx: Add pci device id 0x2261.
    qla2xxx: Fix missing device login retries.
    qla2xxx: do not clear slot in outstanding cmd array
    qla2xxx: Remove decrement of sp reference count in abort handler.
    qla2xxx: Add support to show MPI and PEP FW version for ISP27xx.
    ...

    Linus Torvalds
     

27 Aug, 2015

2 commits

  • 2cb79266d   cxlflash: Virtual LUN support ... Browse Code »

    Add support for physical LUN segmentation (virtual LUNs) to device
    driver supporting the IBM CXL Flash adapter. This patch allows user
    space applications to virtually segment a physical LUN into N virtual
    LUNs, taking advantage of the translation features provided by this
    adapter.

    Signed-off-by: Matthew R. Ochs
    Signed-off-by: Manoj N. Kumar
    Reviewed-by: Michael Neuling
    Reviewed-by: Wen Xiong
    Signed-off-by: James Bottomley

    Matthew R. Ochs
     
  • 65be2c79a   cxlflash: Superpipe support ... Browse Code »

    Add superpipe supporting infrastructure to device driver for the IBM CXL
    Flash adapter. This patch allows userspace applications to take advantage
    of the accelerated I/O features that this adapter provides and bypass the
    traditional filesystem stack.

    Signed-off-by: Matthew R. Ochs
    Signed-off-by: Manoj N. Kumar
    Reviewed-by: Michael Neuling
    Reviewed-by: Wen Xiong
    Reviewed-by: Brian King
    Signed-off-by: James Bottomley

    Matthew R. Ochs
     

11 Jul, 2015

1 commit

19 Jun, 2015

1 commit

  • b4b56f9ec   powerpc/tm: Abort syscalls in active transactions ... Browse Code »

    This patch changes the syscall handler to doom (tabort) active
    transactions when a syscall is made and return very early without
    performing the syscall and keeping side effects to a minimum (no CPU
    accounting or system call tracing is performed). Also included is a
    new HWCAP2 bit, PPC_FEATURE2_HTM_NOSC, to indicate this
    behaviour to userspace.

    Currently, the system call instruction automatically suspends an
    active transaction which causes side effects to persist when an active
    transaction fails.

    This does change the kernel's behaviour, but in a way that was
    documented as unsupported. It doesn't reduce functionality as
    syscalls will still be performed after tsuspend; it just requires that
    the transaction be explicitly suspended. It also provides a
    consistent interface and makes the behaviour of user code
    substantially the same across powerpc and platforms that do not
    support suspended transactions (e.g. x86 and s390).

    Performance measurements using
    http://ozlabs.org/~anton/junkcode/null_syscall.c indicate the cost of
    a normal (non-aborted) system call increases by about 0.25%.

    Signed-off-by: Sam Bobroff
    Signed-off-by: Michael Ellerman

    Sam bobroff
     

07 Jun, 2015

1 commit

  • 4eb2088c0   powerpc/dscr: Add documentation for DSCR support ... Browse Code »

    This patch adds a new documentation file explaining the DSCR support on
    powerpc platforms. This explains DSCR related data structure, code paths
    and also available user interfaces. Any further functional changes to
    the DSCR support in the kernel should definitely update the
    documentation here.

    Signed-off-by: Anshuman Khandual
    Signed-off-by: Michael Ellerman

    Anshuman Khandual
     

03 Jun, 2015

1 commit

30 Apr, 2015

1 commit

  • 68fc378ce   Revert "powerpc/tm: Abort syscalls in active transactions" ... Browse Code »

    This reverts commit feba40362b11341bee6d8ed58d54b896abbd9f84.

    Although the principle of this change is good, the implementation has a
    few issues.

    Firstly we can sometimes fail to abort a syscall because r12 may have
    been clobbered by C code if we went down the virtual CPU accounting
    path, or if syscall tracing was enabled.

    Secondly we have decided that it is safer to abort the syscall even
    earlier in the syscall entry path, so that we avoid the syscall tracing
    path when we are transactional.

    So that we have time to thoroughly test those changes we have decided to
    revert this for this merge window and will merge the fixed version in
    the next window.

    NB. Rather than reverting the selftest we just drop tm-syscall from
    TEST_PROGS so that it's not run by default.

    Fixes: feba40362b11 ("powerpc/tm: Abort syscalls in active transactions")
    Signed-off-by: Michael Ellerman

    Michael Ellerman
     

14 Apr, 2015

1 commit

11 Apr, 2015

2 commits

  • d1d915783   powerpc/tm: Correct minor documentation typos ... Browse Code »

    Signed-off-by: Sam Bobroff
    Signed-off-by: Michael Ellerman

    Sam bobroff
     
  • feba40362   powerpc/tm: Abort syscalls in active transactions ... Browse Code »

    This patch changes the syscall handler to doom (tabort) active
    transactions when a syscall is made and return immediately without
    performing the syscall.

    Currently, the system call instruction automatically suspends an
    active transaction which causes side effects to persist when an active
    transaction fails.

    This does change the kernel's behaviour, but in a way that was
    documented as unsupported. It doesn't reduce functionality because
    syscalls will still be performed after tsuspend. It also provides a
    consistent interface and makes the behaviour of user code
    substantially the same across powerpc and platforms that do not
    support suspended transactions (e.g. x86 and s390).

    Performance measurements using
    http://ozlabs.org/~anton/junkcode/null_syscall.c
    indicate the cost of a system call increases by about 0.5%.

    Signed-off-by: Sam Bobroff
    Acked-By: Michael Neuling
    Signed-off-by: Michael Ellerman

    Sam bobroff
     

31 Mar, 2015

1 commit

  • 330524404   powerpc/pci: Add PCI resource alignment documentation ... Browse Code »

    In order to enable SRIOV on PowerNV platform, the PF's IOV BAR needs to be
    adjusted:

    1. size expanded
    2. aligned to M64BT size

    This patch documents this change on the reason and how.

    [bhelgaas: reformat, clarify, expand]
    Signed-off-by: Wei Yang
    Signed-off-by: Benjamin Herrenschmidt

    Wei Yang
     

08 Oct, 2014

1 commit

  • a9282d01c   cxl: Add documentation for userspace APIs ... Browse Code »

    This documentation gives an overview of the hardware architecture, userspace
    APIs via /dev/cxl/afuM.N and the syfs files. It also adds a MAINTAINERS file
    entry for cxl.

    Signed-off-by: Ian Munsie
    Signed-off-by: Michael Neuling
    Signed-off-by: Michael Ellerman

    Ian Munsie
     

28 Jul, 2014

1 commit

  • b2677b8dd   KVM: PPC: Remove 440 support ... Browse Code »

    The 440 target hasn't been properly functioning for a few releases and
    before I was the only one who fixes a very serious bug that indicates to
    me that nobody used it before either.

    Furthermore KVM on 440 is slow to the extent of unusable.

    We don't have to carry along completely unused code. Remove 440 and give
    us one less thing to worry about.

    Signed-off-by: Alexander Graf

    Alexander Graf
     

11 Jun, 2014

1 commit

  • c5aec4c76   Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc ... Browse Code »

    Pull powerpc updates from Ben Herrenschmidt:
    "Here is the bulk of the powerpc changes for this merge window. It got
    a bit delayed in part because I wasn't paying attention, and in part
    because I discovered I had a core PCI change without a PCI maintainer
    ack in it. Bjorn eventually agreed it was ok to merge it though we'll
    probably improve it later and I didn't want to rebase to add his ack.

    There is going to be a bit more next week, essentially fixes that I
    still want to sort through and test.

    The biggest item this time is the support to build the ppc64 LE kernel
    with our new v2 ABI. We previously supported v2 userspace but the
    kernel itself was a tougher nut to crack. This is now sorted mostly
    thanks to Anton and Rusty.

    We also have a fairly big series from Cedric that add support for
    64-bit LE zImage boot wrapper. This was made harder by the fact that
    traditionally our zImage wrapper was always 32-bit, but our new LE
    toolchains don't really support 32-bit anymore (it's somewhat there
    but not really "supported") so we didn't want to rely on it. This
    meant more churn that just endian fixes.

    This brings some more LE bits as well, such as the ability to run in
    LE mode without a hypervisor (ie. under OPAL firmware) by doing the
    right OPAL call to reinitialize the CPU to take HV interrupts in the
    right mode and the usual pile of endian fixes.

    There's another series from Gavin adding EEH improvements (one day we
    *will* have a release with less than 20 EEH patches, I promise!).

    Another highlight is the support for the "Split core" functionality on
    P8 by Michael. This allows a P8 core to be split into "sub cores" of
    4 threads which allows the subcores to run different guests under KVM
    (the HW still doesn't support a partition per thread).

    And then the usual misc bits and fixes ..."

    [ Further delayed by gmail deciding that BenH is a dirty spammer.
    Google knows. ]

    * 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc: (155 commits)
    powerpc/powernv: Add missing include to LPC code
    selftests/powerpc: Test the THP bug we fixed in the previous commit
    powerpc/mm: Check paca psize is up to date for huge mappings
    powerpc/powernv: Pass buffer size to OPAL validate flash call
    powerpc/pseries: hcall functions are exported to modules, need _GLOBAL_TOC()
    powerpc: Exported functions __clear_user and copy_page use r2 so need _GLOBAL_TOC()
    powerpc/powernv: Set memory_block_size_bytes to 256MB
    powerpc: Allow ppc_md platform hook to override memory_block_size_bytes
    powerpc/powernv: Fix endian issues in memory error handling code
    powerpc/eeh: Skip eeh sysfs when eeh is disabled
    powerpc: 64bit sendfile is capped at 2GB
    powerpc/powernv: Provide debugfs access to the LPC bus via OPAL
    powerpc/serial: Use saner flags when creating legacy ports
    powerpc: Add cpu family documentation
    powerpc/xmon: Fix up xmon format strings
    powerpc/powernv: Add calls to support little endian host
    powerpc: Document sysfs DSCR interface
    powerpc: Fix regression of per-CPU DSCR setting
    powerpc: Split __SYSFS_SPRSETUP macro
    arch: powerpc/fadump: Cleaning up inconsistent NULL checks
    ...

    Linus Torvalds
     

05 Jun, 2014

1 commit

05 May, 2014

1 commit

27 Aug, 2013

1 commit

01 Jul, 2013

1 commit

  • 330a1eb77   powerpc/perf: Core EBB support for 64-bit book3s ... Browse Code »

    Add support for EBB (Event Based Branches) on 64-bit book3s. See the
    included documentation for more details.

    EBBs are a feature which allows the hardware to branch directly to a
    specified user space address when a PMU event overflows. This can be
    used by programs for self-monitoring with no kernel involvement in the
    inner loop.

    Most of the logic is in the generic book3s code, primarily to avoid a
    proliferation of PMU callbacks.

    Signed-off-by: Michael Ellerman
    Signed-off-by: Benjamin Herrenschmidt

    Michael Ellerman
     

01 Jun, 2013

3 commits

  • 2b3f8e87c   powerpc/tm: Fix userspace stack corruption on signal delivery for active transactions ... Browse Code »

    When in an active transaction that takes a signal, we need to be careful with
    the stack. It's possible that the stack has moved back up after the tbegin.
    The obvious case here is when the tbegin is called inside a function that
    returns before a tend. In this case, the stack is part of the checkpointed
    transactional memory state. If we write over this non transactionally or in
    suspend, we are in trouble because if we get a tm abort, the program counter
    and stack pointer will be back at the tbegin but our in memory stack won't be
    valid anymore.

    To avoid this, when taking a signal in an active transaction, we need to use
    the stack pointer from the checkpointed state, rather than the speculated
    state. This ensures that the signal context (written tm suspended) will be
    written below the stack required for the rollback. The transaction is aborted
    becuase of the treclaim, so any memory written between the tbegin and the
    signal will be rolled back anyway.

    For signals taken in non-TM or suspended mode, we use the
    normal/non-checkpointed stack pointer.

    Tested with 64 and 32 bit signals

    Signed-off-by: Michael Neuling
    Cc: # v3.9
    Signed-off-by: Benjamin Herrenschmidt

    Michael Neuling
     
  • 6ce6c629f   powerpc/tm: Abort on emulation and alignment faults ... Browse Code »

    If we are emulating an instruction inside an active user transaction that
    touches memory, the kernel can't emulate it as it operates in transactional
    suspend context. We need to abort these transactions and send them back to
    userspace for the hardware to rollback.

    We can service these if the user transaction is in suspend mode, since the
    kernel will operate in the same suspend context.

    This adds a check to all alignment faults and to specific instruction
    emulations (only string instructions for now). If the user process is in an
    active (non-suspended) transaction, we abort the transaction go back to
    userspace allowing the HW to roll back the transaction and tell the user of the
    failure. This also adds new tm abort cause codes to report the reason of the
    persistent error to the user.

    Crappy test case here http://neuling.org/devel/junkcode/aligntm.c

    Signed-off-by: Michael Neuling
    Cc: # v3.9
    Signed-off-by: Benjamin Herrenschmidt

    Michael Neuling
     
  • 24b92375d   powerpc/tm: Update cause codes documentation ... Browse Code »

    Signed-off-by: Michael Neuling
    Cc: # 3.9 only
    Signed-off-by: Benjamin Herrenschmidt

    Michael Neuling
     

18 Apr, 2013

2 commits

  • 517b73147   powerpc/ptrace: Add DAWR debug feature info for userspace ... Browse Code »

    This adds new debug feature information so that the DAWR can be
    identified by userspace tools like GDB.

    Unfortunately the DAWR doesn't sit nicely into the current description
    that ptrace provides to userspace via struct ppc_debug_info. It doesn't
    allow for specifying that only some ranges are possible or even the end
    alignment constraints (DAWR only allows 512 byte wide ranges which can't
    cross a 512 byte boundary).

    After talking to Edjunior Machado (GDB ppc developer), it was decided
    this was the best approach. Just mark it as debug feature DAWR and
    tools like GDB can internally decide the constraints.

    Signed-off-by: Michael Neuling
    Signed-off-by: Michael Ellerman

    Michael Neuling
     
  • 933ee7119   powerpc: remove PReP platform ... Browse Code »

    PPC_PREP is marked as BROKEN since v2.6.15. Remove all PReP specific
    code now.

    Signed-off-by: Paul Bolle
    Signed-off-by: Michael Ellerman

    Paul Bolle
     

15 Feb, 2013

1 commit

10 Jan, 2013

1 commit

15 Nov, 2012

1 commit

  • 6c7a2856a   powerpc/hw-breakpoint: Use generic hw-breakpoint interfaces for new PPC ptrace flags ... Browse Code »

    PPC_PTRACE_GETHWDBGINFO, PPC_PTRACE_SETHWDEBUG and PPC_PTRACE_DELHWDEBUG are
    PowerPC specific ptrace flags that use the watchpoint register. While they are
    targeted primarily towards BookE users, user-space applications such as GDB
    have started using them for BookS too. This patch enables the use of generic
    hardware breakpoint interfaces for these new flags.

    Apart from the usual benefits of using generic hw-breakpoint interfaces, these
    changes allow debuggers (such as GDB) to use a common set of ptrace flags for
    their watchpoint needs and allow more precise breakpoint specification (length
    of the variable can be specified).

    Mikey added: rebased and added dbginfo.features around #ifdef
    CONFIG_HAVE_HW_BREAKPOINT

    Signed-off-by: K.Prasad
    Acked-by: David Gibson
    Signed-off-by: Benjamin Herrenschmidt
    Signed-off-by: Michael Neuling
    Signed-off-by: Benjamin Herrenschmidt

    K.Prasad
     

19 Mar, 2012

1 commit

23 Feb, 2012

2 commits

31 Mar, 2011

1 commit

17 Mar, 2011

1 commit

31 Jan, 2011

1 commit

14 Jan, 2011

1 commit

  • 008d23e48   Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial ... Browse Code »

    * 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial: (43 commits)
    Documentation/trace/events.txt: Remove obsolete sched_signal_send.
    writeback: fix global_dirty_limits comment runtime -> real-time
    ppc: fix comment typo singal -> signal
    drivers: fix comment typo diable -> disable.
    m68k: fix comment typo diable -> disable.
    wireless: comment typo fix diable -> disable.
    media: comment typo fix diable -> disable.
    remove doc for obsolete dynamic-printk kernel-parameter
    remove extraneous 'is' from Documentation/iostats.txt
    Fix spelling milisec -> ms in snd_ps3 module parameter description
    Fix spelling mistakes in comments
    Revert conflicting V4L changes
    i7core_edac: fix typos in comments
    mm/rmap.c: fix comment
    sound, ca0106: Fix assignment to 'channel'.
    hrtimer: fix a typo in comment
    init/Kconfig: fix typo
    anon_inodes: fix wrong function name in comment
    fix comment typos concerning "consistent"
    poll: fix a typo in comment
    ...

    Fix up trivial conflicts in:
    - drivers/net/wireless/iwlwifi/iwl-core.c (moved to iwl-legacy.c)
    - fs/ext4/ext4.h

    Also fix missed 'diabled' typo in drivers/net/bnx2x/bnx2x.h while at it.

    Linus Torvalds
     

12 Jan, 2011

1 commit

  • 5a62f9954   Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc ... Browse Code »

    * 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc: (72 commits)
    powerpc/pseries: Fix build of topology stuff without CONFIG_NUMA
    powerpc/pseries: Fix VPHN build errors on non-SMP systems
    powerpc/83xx: add mpc8308_p1m DMA controller device-tree node
    powerpc/83xx: add DMA controller to mpc8308 device-tree node
    powerpc/512x: try to free dma descriptors in case of allocation failure
    powerpc/512x: add MPC8308 dma support
    powerpc/512x: fix the hanged dma transfer issue
    powerpc/512x: scatter/gather dma fix
    powerpc/powermac: Make auto-loading of therm_pm72 possible
    of/address: Use propper endianess in get_flags
    powerpc/pci: Use printf extension %pR for struct resource
    powerpc: Remove unnecessary casts of void ptr
    powerpc: Disable VPHN polling during a suspend operation
    powerpc/pseries: Poll VPA for topology changes and update NUMA maps
    powerpc: iommu: Add device name to iommu error printks
    powerpc: Record vma->phys_addr in ioremap()
    powerpc: Update compat_arch_ptrace
    powerpc: Fix PPC_PTRACE_SETHWDEBUG on PPC_BOOK3S
    powerpc/time: printk time stamp init not correct
    powerpc: Minor cleanups for machdep.h
    ...

    Linus Torvalds
     

24 Dec, 2010

1 commit

  • 9ed030d72   misc/at24: parse device tree data ... Browse Code »

    Information about the pagesize and read-only-status may also come from
    the devicetree. Parse this data, too, and act accordingly. While we are
    here, change the initialization printout a bit. write_max is useful to
    know to detect performance bottlenecks, the rest is superfluous.

    Signed-off-by: Wolfram Sang
    Signed-off-by: Grant Likely

    Wolfram Sang
     

29 Nov, 2010

2 commits