1. 09 Jan, 2019 2 commits
    • Linus Walleij's avatar
      spi: ath79: Convert to use CS GPIO descriptors · 8db79547
      Linus Walleij authored
      This converts the ATH79 SPI master driver to use GPIO descriptors
      for chip select handling.
      
      The ATH79 driver was requesting the GPIO and driving it from the
      bitbang .chipselect callback. Do not request it anymore as the SPI
      core will request it, remove the line inversion semantics for the
      GPIO case (handled by gpiolib) and let the SPI core deal with
      requesting the GPIO line from the device tree node of the controller.
      
      This driver can be instantiated from a board file (no device tree)
      but the board files only use native CS (no GPIO lines) so we should
      be fine just letting the SPI core grab the GPIO from the device.
      
      The fact that the driver is actively driving the GPIO in the
      ath79_spi_chipselect() callback is confusing since the host does
      not set SPI_MASTER_GPIO_SS so this should not ever get called when
      using GPIO CS. I put in a comment about this.
      
      Cc: Felix Fietkau <nbd@nbd.name>
      Cc: Alban Bedel <albeu@free.fr>
      Cc: Linuxarm <linuxarm@huawei.com>
      Signed-off-by: default avatarLinus Walleij <linus.walleij@linaro.org>
      Signed-off-by: default avatarMark Brown <broonie@kernel.org>
      8db79547
    • Linus Walleij's avatar
      spi: Optionally use GPIO descriptors for CS GPIOs · f3186dd8
      Linus Walleij authored
      This augments the SPI core to optionally use GPIO descriptors
      for chip select on a per-master-driver opt-in basis.
      
      Drivers using this will rely on the SPI core to look up
      GPIO descriptors associated with the device, such as
      when using device tree or board files with GPIO descriptor
      tables.
      
      When getting descriptors from the device tree, this will in
      turn activate the code in gpiolib that was
      added in commit 6953c57a
      ("gpio: of: Handle SPI chipselect legacy bindings")
      which means that these descriptors are aware of the active
      low semantics that is the default for SPI CS GPIO lines
      and we can assume that all of these are "active high" and
      thus assign SPI_CS_HIGH to all CS lines on the DT path.
      
      The previously used gpio_set_value() would call down into
      gpiod_set_raw_value() and ignore the polarity inversion
      semantics.
      
      It seems like many drivers go to great lengths to set up the
      CS GPIO line as non-asserted, respecting SPI_CS_HIGH. We pull
      this out of the SPI drivers and into the core, and by simply
      requesting the line as GPIOD_OUT_LOW when retrieveing it from
      the device and relying on the gpiolib to handle any inversion
      semantics. This way a lot of code can be simplified and
      removed in each converted driver.
      
      The end goal after dealing with each driver in turn, is to
      delete the non-descriptor path (of_spi_register_master() for
      example) and let the core deal with only descriptors.
      
      The different SPI drivers have complex interactions with the
      core so we cannot simply change them all over, we need to use
      a stepwise, bisectable approach so that each driver can be
      converted and fixed in isolation.
      
      This patch has the intended side effect of adding support for
      ACPI GPIOs as it starts relying on gpiod_get_*() to get
      the GPIO handle associated with the device.
      
      Cc: Linuxarm <linuxarm@huawei.com>
      Acked-by: default avatarJonathan Cameron <jonathan.cameron@huawei.com>
      Tested-by: default avatarFangjian (Turing) <f.fangjian@huawei.com>
      Signed-off-by: default avatarLinus Walleij <linus.walleij@linaro.org>
      Signed-off-by: default avatarMark Brown <broonie@kernel.org>
      f3186dd8
  2. 07 Jan, 2019 25 commits
  3. 06 Jan, 2019 13 commits
    • Linus Torvalds's avatar
      Change mincore() to count "mapped" pages rather than "cached" pages · 574823bf
      Linus Torvalds authored
      The semantics of what "in core" means for the mincore() system call are
      somewhat unclear, but Linux has always (since 2.3.52, which is when
      mincore() was initially done) treated it as "page is available in page
      cache" rather than "page is mapped in the mapping".
      
      The problem with that traditional semantic is that it exposes a lot of
      system cache state that it really probably shouldn't, and that users
      shouldn't really even care about.
      
      So let's try to avoid that information leak by simply changing the
      semantics to be that mincore() counts actual mapped pages, not pages
      that might be cheaply mapped if they were faulted (note the "might be"
      part of the old semantics: being in the cache doesn't actually guarantee
      that you can access them without IO anyway, since things like network
      filesystems may have to revalidate the cache before use).
      
      In many ways the old semantics were somewhat insane even aside from the
      information leak issue.  From the very beginning (and that beginning is
      a long time ago: 2.3.52 was released in March 2000, I think), the code
      had a comment saying
      
        Later we can get more picky about what "in core" means precisely.
      
      and this is that "later".  Admittedly it is much later than is really
      comfortable.
      
      NOTE! This is a real semantic change, and it is for example known to
      change the output of "fincore", since that program literally does a
      mmmap without populating it, and then doing "mincore()" on that mapping
      that doesn't actually have any pages in it.
      
      I'm hoping that nobody actually has any workflow that cares, and the
      info leak is real.
      
      We may have to do something different if it turns out that people have
      valid reasons to want the old semantics, and if we can limit the
      information leak sanely.
      
      Cc: Kevin Easton <kevin@guarana.org>
      Cc: Jiri Kosina <jikos@kernel.org>
      Cc: Masatake YAMATO <yamato@redhat.com>
      Cc: Andrew Morton <akpm@linux-foundation.org>
      Cc: Greg KH <gregkh@linuxfoundation.org>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Michal Hocko <mhocko@suse.com>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      574823bf
    • Linus Torvalds's avatar
      Fix 'acccess_ok()' on alpha and SH · 94bd8a05
      Linus Torvalds authored
      Commit 594cc251 ("make 'user_access_begin()' do 'access_ok()'")
      broke both alpha and SH booting in qemu, as noticed by Guenter Roeck.
      
      It turns out that the bug wasn't actually in that commit itself (which
      would have been surprising: it was mostly a no-op), but in how the
      addition of access_ok() to the strncpy_from_user() and strnlen_user()
      functions now triggered the case where those functions would test the
      access of the very last byte of the user address space.
      
      The string functions actually did that user range test before too, but
      they did it manually by just comparing against user_addr_max().  But
      with user_access_begin() doing the check (using "access_ok()"), it now
      exposed problems in the architecture implementations of that function.
      
      For example, on alpha, the access_ok() helper macro looked like this:
      
        #define __access_ok(addr, size) \
              ((get_fs().seg & (addr | size | (addr+size))) == 0)
      
      and what it basically tests is of any of the high bits get set (the
      USER_DS masking value is 0xfffffc0000000000).
      
      And that's completely wrong for the "addr+size" check.  Because it's
      off-by-one for the case where we check to the very end of the user
      address space, which is exactly what the strn*_user() functions do.
      
      Why? Because "addr+size" will be exactly the size of the address space,
      so trying to access the last byte of the user address space will fail
      the __access_ok() check, even though it shouldn't.  As a result, the
      user string accessor functions failed consistently - because they
      literally don't know how long the string is going to be, and the max
      access is going to be that last byte of the user address space.
      
      Side note: that alpha macro is buggy for another reason too - it re-uses
      the arguments twice.
      
      And SH has another version of almost the exact same bug:
      
        #define __addr_ok(addr) \
              ((unsigned long __force)(addr) < current_thread_info()->addr_limit.seg)
      
      so far so good: yes, a user address must be below the limit.  But then:
      
        #define __access_ok(addr, size)         \
              (__addr_ok((addr) + (size)))
      
      is wrong with the exact same off-by-one case: the case when "addr+size"
      is exactly _equal_ to the limit is actually perfectly fine (think "one
      byte access at the last address of the user address space")
      
      The SH version is actually seriously buggy in another way: it doesn't
      actually check for overflow, even though it did copy the _comment_ that
      talks about overflow.
      
      So it turns out that both SH and alpha actually have completely buggy
      implementations of access_ok(), but they happened to work in practice
      (although the SH overflow one is a serious serious security bug, not
      that anybody likely cares about SH security).
      
      This fixes the problems by using a similar macro on both alpha and SH.
      It isn't trying to be clever, the end address is based on this logic:
      
              unsigned long __ao_end = __ao_a + __ao_b - !!__ao_b;
      
      which basically says "add start and length, and then subtract one unless
      the length was zero".  We can't subtract one for a zero length, or we'd
      just hit an underflow instead.
      
      For a lot of access_ok() users the length is a constant, so this isn't
      actually as expensive as it initially looks.
      Reported-and-tested-by: default avatarGuenter Roeck <linux@roeck-us.net>
      Cc: Matt Turner <mattst88@gmail.com>
      Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      94bd8a05
    • Linus Torvalds's avatar
      Merge tag 'fscrypt_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/fscrypt · baa67073
      Linus Torvalds authored
      Pull fscrypt updates from Ted Ts'o:
       "Add Adiantum support for fscrypt"
      
      * tag 'fscrypt_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/fscrypt:
        fscrypt: add Adiantum support
      baa67073
    • Linus Torvalds's avatar
      Merge tag 'ext4_for_linus_stable' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4 · 21524046
      Linus Torvalds authored
      Pull ext4 bug fixes from Ted Ts'o:
       "Fix a number of ext4 bugs"
      
      * tag 'ext4_for_linus_stable' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4:
        ext4: fix special inode number checks in __ext4_iget()
        ext4: track writeback errors using the generic tracking infrastructure
        ext4: use ext4_write_inode() when fsyncing w/o a journal
        ext4: avoid kernel warning when writing the superblock to a dead device
        ext4: fix a potential fiemap/page fault deadlock w/ inline_data
        ext4: make sure enough credits are reserved for dioread_nolock writes
      21524046
    • Linus Torvalds's avatar
      Merge tag 'dma-mapping-4.21-1' of git://git.infradead.org/users/hch/dma-mapping · e2b745f4
      Linus Torvalds authored
      Pull dma-mapping fixes from Christoph Hellwig:
       "Fix various regressions introduced in this cycles:
      
         - fix dma-debug tracking for the map_page / map_single
           consolidatation
      
         - properly stub out DMA mapping symbols for !HAS_DMA builds to avoid
           link failures
      
         - fix AMD Gart direct mappings
      
         - setup the dma address for no kernel mappings using the remap
           allocator"
      
      * tag 'dma-mapping-4.21-1' of git://git.infradead.org/users/hch/dma-mapping:
        dma-direct: fix DMA_ATTR_NO_KERNEL_MAPPING for remapped allocations
        x86/amd_gart: fix unmapping of non-GART mappings
        dma-mapping: remove a few unused exports
        dma-mapping: properly stub out the DMA API for !CONFIG_HAS_DMA
        dma-mapping: remove dmam_{declare,release}_coherent_memory
        dma-mapping: implement dmam_alloc_coherent using dmam_alloc_attrs
        dma-mapping: implement dma_map_single_attrs using dma_map_page_attrs
      e2b745f4
    • Linus Torvalds's avatar
      Merge tag 'tag-chrome-platform-for-v4.21' of... · 12133258
      Linus Torvalds authored
      Merge tag 'tag-chrome-platform-for-v4.21' of git://git.kernel.org/pub/scm/linux/kernel/git/bleung/chrome-platform
      
      Pull chrome platform updates from Benson Leung:
      
       - Changes for EC_MKBP_EVENT_SENSOR_FIFO handling.
      
       - Also, maintainership changes. Olofj out, Enric balletbo in.
      
      * tag 'tag-chrome-platform-for-v4.21' of git://git.kernel.org/pub/scm/linux/kernel/git/bleung/chrome-platform:
        MAINTAINERS: add maintainers for ChromeOS EC sub-drivers
        MAINTAINERS: platform/chrome: Add Enric as a maintainer
        MAINTAINERS: platform/chrome: remove myself as maintainer
        platform/chrome: don't report EC_MKBP_EVENT_SENSOR_FIFO as wakeup
        platform/chrome: straighten out cros_ec_get_{next,host}_event() error codes
      12133258
    • Linus Torvalds's avatar
      Merge tag 'hwlock-v4.21' of git://github.com/andersson/remoteproc · 66e012f6
      Linus Torvalds authored
      Pull hwspinlock updates from Bjorn Andersson:
       "This adds support for the hardware semaphores found in STM32MP1"
      
      * tag 'hwlock-v4.21' of git://github.com/andersson/remoteproc:
        hwspinlock: fix return value check in stm32_hwspinlock_probe()
        hwspinlock: add STM32 hwspinlock device
        dt-bindings: hwlock: Document STM32 hwspinlock bindings
      66e012f6
    • Eric Biggers's avatar
      fscrypt: add Adiantum support · 8094c3ce
      Eric Biggers authored
      Add support for the Adiantum encryption mode to fscrypt.  Adiantum is a
      tweakable, length-preserving encryption mode with security provably
      reducible to that of XChaCha12 and AES-256, subject to a security bound.
      It's also a true wide-block mode, unlike XTS.  See the paper
      "Adiantum: length-preserving encryption for entry-level processors"
      (https://eprint.iacr.org/2018/720.pdf) for more details.  Also see
      commit 059c2a4d ("crypto: adiantum - add Adiantum support").
      
      On sufficiently long messages, Adiantum's bottlenecks are XChaCha12 and
      the NH hash function.  These algorithms are fast even on processors
      without dedicated crypto instructions.  Adiantum makes it feasible to
      enable storage encryption on low-end mobile devices that lack AES
      instructions; currently such devices are unencrypted.  On ARM Cortex-A7,
      on 4096-byte messages Adiantum encryption is about 4 times faster than
      AES-256-XTS encryption; decryption is about 5 times faster.
      
      In fscrypt, Adiantum is suitable for encrypting both file contents and
      names.  With filenames, it fixes a known weakness: when two filenames in
      a directory share a common prefix of >= 16 bytes, with CTS-CBC their
      encrypted filenames share a common prefix too, leaking information.
      Adiantum does not have this problem.
      
      Since Adiantum also accepts long tweaks (IVs), it's also safe to use the
      master key directly for Adiantum encryption rather than deriving
      per-file keys, provided that the per-file nonce is included in the IVs
      and the master key isn't used for any other encryption mode.  This
      configuration saves memory and improves performance.  A new fscrypt
      policy flag is added to allow users to opt-in to this configuration.
      Signed-off-by: default avatarEric Biggers <ebiggers@google.com>
      Signed-off-by: default avatarTheodore Ts'o <tytso@mit.edu>
      8094c3ce
    • Linus Torvalds's avatar
      Merge tag 'docs-5.0-fixes' of git://git.lwn.net/linux · b5aef86e
      Linus Torvalds authored
      Pull documentation fixes from Jonathan Corbet:
       "A handful of late-arriving documentation fixes"
      
      * tag 'docs-5.0-fixes' of git://git.lwn.net/linux:
        doc: filesystems: fix bad references to nonexistent ext4.rst file
        Documentation/admin-guide: update URL of LKML information link
        Docs/kernel-api.rst: Remove blk-tag.c reference
      b5aef86e
    • Linus Torvalds's avatar
      Merge tag 'firewire-update' of git://git.kernel.org/pub/scm/linux/kernel/git/ieee1394/linux1394 · 15b215e5
      Linus Torvalds authored
      Pull firewire fixlet from Stefan Richter:
       "Remove an explicit dependency in Kconfig which is implied by another
        dependency"
      
      * tag 'firewire-update' of git://git.kernel.org/pub/scm/linux/kernel/git/ieee1394/linux1394:
        firewire: Remove depends on HAS_DMA in case of platform dependency
      15b215e5
    • Linus Torvalds's avatar
      Merge tag 'for-linus-20190104' of git://git.kernel.dk/linux-block · d7252d0d
      Linus Torvalds authored
      Pull block updates and fixes from Jens Axboe:
      
       - Pulled in MD changes that Shaohua had queued up for 4.21.
      
         Unfortunately we lost Shaohua late 2018, I'm sending these in on his
         behalf.
      
       - In conjunction with the above, I added a CREDITS entry for Shaoua.
      
       - sunvdc queue restart fix (Ming)
      
      * tag 'for-linus-20190104' of git://git.kernel.dk/linux-block:
        Add CREDITS entry for Shaohua Li
        block: sunvdc: don't run hw queue synchronously from irq context
        md: fix raid10 hang issue caused by barrier
        raid10: refactor common wait code from regular read/write request
        md: remvoe redundant condition check
        lib/raid6: add option to skip algo benchmarking
        lib/raid6: sort algos in rough performance order
        lib/raid6: check for assembler SSSE3 support
        lib/raid6: avoid __attribute_const__ redefinition
        lib/raid6: add missing include for raid6test
        md: remove set but not used variable 'bi_rdev'
      d7252d0d
    • Linus Torvalds's avatar
      Merge tag 'drm-next-2019-01-05' of git://anongit.freedesktop.org/drm/drm · 0fe4e2d5
      Linus Torvalds authored
      Pull drm fixes from Dave Airlie:
       "Happy New Year, just decloaking from leave to get some stuff from the
        last week in before rc1:
      
        core:
         - two regression fixes for damage blob and atomic
      
        i915 gvt:
         - Some missed GVT fixes from the original pull
      
        amdgpu:
         - new PCI IDs
         - SR-IOV fixes
         - DC fixes
         - Vega20 fixes"
      
      * tag 'drm-next-2019-01-05' of git://anongit.freedesktop.org/drm/drm: (53 commits)
        drm: Put damage blob when destroy plane state
        drm: fix null pointer dereference on null state pointer
        drm/amdgpu: Add new VegaM pci id
        drm/ttm: Use drm_debug_printer for all ttm_bo_mem_space_debug output
        drm/amdgpu: add Vega20 PSP ASD firmware loading
        drm/amd/display: Fix MST dp_blank REG_WAIT timeout
        drm/amd/display: validate extended dongle caps
        drm/amd/display: Use div_u64 for flip timestamp ns to ms
        drm/amdgpu/uvd:Change uvd ring name convention
        drm/amd/powerplay: add Vega20 LCLK DPM level setting support
        drm/amdgpu: print process info when job timeout
        drm/amdgpu/nbio7.4: add hw bug workaround for vega20
        drm/amdgpu/nbio6.1: add hw bug workaround for vega10/12
        drm/amd/display: Optimize passive update planes.
        drm/amd/display: verify lane status before exiting verify link cap
        drm/amd/display: Fix bug with not updating VSP infoframe
        drm/amd/display: Add retry to read ddc_clock pin
        drm/amd/display: Don't skip link training for empty dongle
        drm/amd/display: Wait edp HPD to high in detect_sink
        drm/amd/display: fix surface update sequence
        ...
      0fe4e2d5
    • Linus Torvalds's avatar
      Merge tag 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rdma/rdma · 3954e1d0
      Linus Torvalds authored
      Pull rdma fixes from Jason Gunthorpe:
       "Over the break a few defects were found, so this is a -rc style pull
        request of various small things that have been posted.
      
         - An attempt to shorten RCU grace period driven delays showed crashes
           during heavier testing, and has been entirely reverted
      
         - A missed merge/rebase error between the advise_mr and ib_device_ops
           series
      
         - Some small static analysis driven fixes from Julia and Aditya
      
         - Missed ability to create a XRC_INI in the devx verbs interop
           series"
      
      * tag 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rdma/rdma:
        infiniband/qedr: Potential null ptr dereference of qp
        infiniband: bnxt_re: qplib: Check the return value of send_message
        IB/ipoib: drop useless LIST_HEAD
        IB/core: Add advise_mr to the list of known ops
        Revert "IB/mlx5: Fix long EEH recover time with NVMe offloads"
        IB/mlx5: Allow XRC INI usage via verbs in DEVX context
      3954e1d0