1. 14 Jun, 2018 1 commit
  2. 08 Jun, 2018 1 commit
    • Laurent Dufour's avatar
      mm: introduce ARCH_HAS_PTE_SPECIAL · 3010a5ea
      Laurent Dufour authored
      Currently the PTE special supports is turned on in per architecture
      header files.  Most of the time, it is defined in
      arch/*/include/asm/pgtable.h depending or not on some other per
      architecture static definition.
      
      This patch introduce a new configuration variable to manage this
      directly in the Kconfig files.  It would later replace
      __HAVE_ARCH_PTE_SPECIAL.
      
      Here notes for some architecture where the definition of
      __HAVE_ARCH_PTE_SPECIAL is not obvious:
      
      arm
       __HAVE_ARCH_PTE_SPECIAL which is currently defined in
      arch/arm/include/asm/pgtable-3level.h which is included by
      arch/arm/include/asm/pgtable.h when CONFIG_ARM_LPAE is set.
      So select ARCH_HAS_PTE_SPECIAL if ARM_LPAE.
      
      powerpc
      __HAVE_ARCH_PTE_SPECIAL is defined in 2 files:
       - arch/powerpc/include/asm/book3s/64/pgtable.h
       - arch/powerpc/include/asm/pte-common.h
      The first one is included if (PPC_BOOK3S & PPC64) while the second is
      included in all the other cases.
      So select ARCH_HAS_PTE_SPECIAL all the time.
      
      sparc:
      __HAVE_ARCH_PTE_SPECIAL is defined if defined(__sparc__) &&
      defined(__arch64__) which are defined through the compiler in
      sparc/Makefile if !SPARC32 which I assume to be if SPARC64.
      So select ARCH_HAS_PTE_SPECIAL if SPARC64
      
      There is no functional change introduced by this patch.
      
      Link: http://lkml.kernel.org/r/1523433816-14460-2-git-send-email-ldufour@linux.vnet.ibm.com
      
      Signed-off-by: default avatarLaurent Dufour <ldufour@linux.vnet.ibm.com>
      Suggested-by: default avatarJerome Glisse <jglisse@redhat.com>
      Reviewed-by: default avatarJerome Glisse <jglisse@redhat.com>
      Acked-by: default avatarDavid Rientjes <rientjes@google.com>
      Cc: Michal Hocko <mhocko@kernel.org>
      Cc: "Aneesh Kumar K . V" <aneesh.kumar@linux.vnet.ibm.com>
      Cc: Michael Ellerman <mpe@ellerman.id.au>
      Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
      Cc: Paul Mackerras <paulus@samba.org>
      Cc: Jonathan Corbet <corbet@lwn.net>
      Cc: Catalin Marinas <catalin.marinas@arm.com>
      Cc: Will Deacon <will.deacon@arm.com>
      Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
      Cc: Rich Felker <dalias@libc.org>
      Cc: David S. Miller <davem@davemloft.net>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: Ingo Molnar <mingo@redhat.com>
      Cc: Vineet Gupta <vgupta@synopsys.com>
      Cc: Palmer Dabbelt <palmer@sifive.com>
      Cc: Albert Ou <albert@sifive.com>
      Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
      Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
      Cc: David Rientjes <rientjes@google.com>
      Cc: Robin Murphy <robin.murphy@arm.com>
      Cc: Christophe LEROY <christophe.leroy@c-s.fr>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      3010a5ea
  3. 06 Jun, 2018 1 commit
    • Mathieu Desnoyers's avatar
      arm: Add restartable sequences support · 9800b9dc
      Mathieu Desnoyers authored
      
      
      Call the rseq_handle_notify_resume() function on return to
      userspace if TIF_NOTIFY_RESUME thread flag is set.
      
      Perform fixup on the pre-signal frame when a signal is delivered on top
      of a restartable sequence critical section.
      Signed-off-by: default avatarMathieu Desnoyers <mathieu.desnoyers@efficios.com>
      Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
      Cc: Joel Fernandes <joelaf@google.com>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Catalin Marinas <catalin.marinas@arm.com>
      Cc: Dave Watson <davejwatson@fb.com>
      Cc: Will Deacon <will.deacon@arm.com>
      Cc: Andi Kleen <andi@firstfloor.org>
      Cc: "H . Peter Anvin" <hpa@zytor.com>
      Cc: Chris Lameter <cl@linux.com>
      Cc: Russell King <linux@arm.linux.org.uk>
      Cc: Andrew Hunter <ahh@google.com>
      Cc: Michael Kerrisk <mtk.manpages@gmail.com>
      Cc: "Paul E . McKenney" <paulmck@linux.vnet.ibm.com>
      Cc: Paul Turner <pjt@google.com>
      Cc: Boqun Feng <boqun.feng@gmail.com>
      Cc: Josh Triplett <josh@joshtriplett.org>
      Cc: Steven Rostedt <rostedt@goodmis.org>
      Cc: Ben Maurer <bmaurer@fb.com>
      Cc: linux-api@vger.kernel.org
      Cc: Andy Lutomirski <luto@amacapital.net>
      Cc: Andrew Morton <akpm@linux-foundation.org>
      Cc: Linus Torvalds <torvalds@linux-foundation.org>
      Link: https://lkml.kernel.org/r/20180602124408.8430-4-mathieu.desnoyers@efficios.com
      9800b9dc
  4. 19 May, 2018 1 commit
  5. 09 May, 2018 5 commits
  6. 08 May, 2018 1 commit
  7. 23 Apr, 2018 1 commit
  8. 28 Mar, 2018 1 commit
  9. 07 Mar, 2018 1 commit
  10. 06 Mar, 2018 1 commit
  11. 21 Jan, 2018 3 commits
    • Arnd Bergmann's avatar
      ARM: 8744/1: don't discard memblock for kexec · ec80eb46
      Arnd Bergmann authored
      Discarding the memblock arrays usually works, but causes problems
      with kexec, as pointed out by this kbuild warning:
      
      WARNING: vmlinux.o(.text+0x7c60): Section mismatch in reference from the function machine_kexec_prepare() to the function .meminit.text:memblock_is_region_memory()
      
      This lets us keep the memblock structures around whenever kexec
      is enabled, but otherwise still drops them.
      
      Fixes: cf1b0990
      
       ("ARM: 8693/1: discard memblock arrays when possible")
      Acked-by: default avatarNicolas Pitre <nico@linaro.org>
      Signed-off-by: default avatarArnd Bergmann <arnd@arndb.de>
      Signed-off-by: default avatarRussell King <rmk+kernel@armlinux.org.uk>
      ec80eb46
    • Jinbum Park's avatar
      ARM: 8742/1: Always use REFCOUNT_FULL · b26d07a0
      Jinbum Park authored
      refcount_t overflow detection is implemented as two way.
      
      1. REFCOUNT_FULL
      
      - It means the full refcount_t implementation
        which has validation but is slightly slower.
      - (fd25d19f ("locking/refcount:
        Create unchecked atomic_t implementation"))
      
      2. ARCH_HAS_REFCOUNT
      
      - refcount_t overflow detection can be optimized
        via an arch-dependent way.
      - It is based on atomic_t infrastructure
        with some instruction added for detection.
      - It is faster than REFCOUNT_FULL,
        as fast as unprotected atomic_t infrastructure.
      - (7a46ec0e ("locking/refcounts, x86/asm:
        Implement fast refcount overflow protection"))
      
      ARCH_HAS_REFCOUNT has implemented for x86,
      not implemented for others.
      
      In the case of arm64,
      Will Deacon said he didn't want the specialized
      "fast but technically incomplete" refcounting as seen with x86's.
      
      But rather to set REFCOUNT_FULL by default
      because no one could point to real-world performance impacts with
      REFCOUNT_FULL vs unprotected atomic_t infrastructure.
      
      This is the reason arm64 ended up enabling REFCOUNT_FULL.
      (4adcec11
      
       ("arm64: Always use REFCOUNT_FULL"))
      
      As with the decision of arm64,
      arm can set REFCOUNT_FULL by default.
      Acked-by: default avatarKees Cook <keescook@chromium.org>
      Signed-off-by: default avatarJinbum Park <jinb.park7@gmail.com>
      Signed-off-by: default avatarRussell King <rmk+kernel@armlinux.org.uk>
      b26d07a0
    • Vladimir Murzin's avatar
      ARM: 8738/1: Disable CONFIG_DEBUG_VIRTUAL for NOMMU · c7780ab5
      Vladimir Murzin authored
      While running MPS2 platform (NOMMU) with DTB placed below PHYS_OFFSET
      following warning poped up:
      
      ------------[ cut here ]------------
      WARNING: CPU: 0 PID: 0 at arch/arm/mm/physaddr.c:42 __virt_to_phys+0x2f/0x40
      virt_to_phys used for non-linear address: 00004000 (0x4000)
      CPU: 0 PID: 0 Comm: swapper Not tainted 4.15.0-rc1-5a31bf2-clean+ #2767
      Hardware name: MPS2 (Device Tree Support)
      [<2100bf39>] (unwind_backtrace) from [<2100b3ff>] (show_stack+0xb/0xc)
      [<2100b3ff>] (show_stack) from [<2100e697>] (__warn+0x87/0xac)
      [<2100e697>] (__warn) from [<2100e6db>] (warn_slowpath_fmt+0x1f/0x28)
      [<2100e6db>] (warn_slowpath_fmt) from [<2100c603>] (__virt_to_phys+0x2f/0x40)
      [<2100c603>] (__virt_to_phys) from [<2116a499>] (early_init_fdt_reserve_self+0xd/0x24)
      [<2116a499>] (early_init_fdt_reserve_self) from [<2116222d>] (arm_memblock_init+0xb5/0xf8)
      [<2116222d>] (arm_memblock_init) from [<21161cad>] (setup_arch+0x38b/0x50e)
      [<21161cad>] (setup_arch) from [<21160455>] (start_kernel+0x31/0x280)
      [<21160455>] (start_kernel) from [<00000000>] (  (null))
      random: get_random_bytes called from init_oops_id+0x17/0x2c with crng_init=0
      ---[ end trace 0000000000000000 ]---
      
      Platforms without MMU support run with 1:1 (i.e. linear) memory
      mapping, so disable CONFIG_DEBUG_VIRTUAL.
      
      Fixes: e377cd82
      
       ("ARM: 8640/1: Add support for CONFIG_DEBUG_VIRTUAL")
      Signed-off-by: Vladimir Murzin's avatarVladimir Murzin <vladimir.murzin@arm.com>
      Signed-off-by: default avatarRussell King <rmk+kernel@armlinux.org.uk>
      c7780ab5
  12. 15 Jan, 2018 2 commits
    • Kees Cook's avatar
      arm: Implement thread_struct whitelist for hardened usercopy · 08626a60
      Kees Cook authored
      
      
      While ARM32 carries FPU state in the thread structure that is saved and
      restored during signal handling, it doesn't need to declare a usercopy
      whitelist, since existing accessors are all either using a bounce buffer
      (for which whitelisting isn't checking the slab), are statically sized
      (which will bypass the hardened usercopy check), or both.
      
      Cc: Russell King <linux@armlinux.org.uk>
      Cc: Ingo Molnar <mingo@kernel.org>
      Cc: Christian Borntraeger <borntraeger@de.ibm.com>
      Cc: "Peter Zijlstra (Intel)" <peterz@infradead.org>
      Cc: linux-arm-kernel@lists.infradead.org
      Signed-off-by: default avatarKees Cook <keescook@chromium.org>
      08626a60
    • Christoph Hellwig's avatar
      dma-direct: rename dma_noop to dma_direct · 002e6745
      Christoph Hellwig authored
      
      
      The trivial direct mapping implementation already does a virtual to
      physical translation which isn't strictly a noop, and will soon learn
      to do non-direct but linear physical to dma translations through the
      device offset and a few small tricks.  Rename it to a better fitting
      name.
      Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
      Reviewed-by: Vladimir Murzin's avatarVladimir Murzin <vladimir.murzin@arm.com>
      002e6745
  13. 10 Jan, 2018 1 commit
    • Christoph Hellwig's avatar
      dma-mapping: move swiotlb arch helpers to a new header · ea8c64ac
      Christoph Hellwig authored
      
      
      phys_to_dma, dma_to_phys and dma_capable are helpers published by
      architecture code for use of swiotlb and xen-swiotlb only.  Drivers are
      not supposed to use these directly, but use the DMA API instead.
      
      Move these to a new asm/dma-direct.h helper, included by a
      linux/dma-direct.h wrapper that provides the default linear mapping
      unless the architecture wants to override it.
      
      In the MIPS case the existing dma-coherent.h is reused for now as
      untangling it will take a bit of work.
      Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
      Acked-by: Robin Murphy's avatarRobin Murphy <robin.murphy@arm.com>
      ea8c64ac
  14. 21 Dec, 2017 1 commit
  15. 17 Dec, 2017 1 commit
    • Nicolas Pitre's avatar
      ARM: 8723/2: always assume the "unified" syntax for assembly code · 75fea300
      Nicolas Pitre authored
      
      
      The GNU assembler has implemented the "unified syntax" parsing since
      2005. This "unified" syntax is required when the kernel is built in
      Thumb2 mode. However the "unified" syntax is a mixed bag of features,
      including not requiring a `#' prefix with immediate operands. This leads
      to situations where some code builds just fine in Thumb2 mode and fails
      to build in ARM mode if that prefix is missing. This behavior
      discrepancy makes build tests less valuable, forcing both ARM and Thumb2
      builds for proper coverage.
      
      Let's "fix" this issue by always using the "unified" syntax for both ARM
      and Thumb2 mode. Given that the documented minimum binutils version that
      properly builds the kernel is version 2.20 released in 2010, we can
      assume that any toolchain capable of building the latest kernel is also
      "unified syntax" capable.
      
      Whith this, a bunch of macros used to mask some differences between both
      syntaxes can be removed, with the side effect of making LTO easier.
      Suggested-by: Robin Murphy's avatarRobin Murphy <robin.murphy@arm.com>
      Signed-off-by: default avatarNicolas Pitre <nico@linaro.org>
      Signed-off-by: default avatarRussell King <rmk+kernel@armlinux.org.uk>
      75fea300
  16. 02 Nov, 2017 1 commit
    • Greg Kroah-Hartman's avatar
      License cleanup: add SPDX GPL-2.0 license identifier to files with no license · b2441318
      Greg Kroah-Hartman authored
      
      
      Many source files in the tree are missing licensing information, which
      makes it harder for compliance tools to determine the correct license.
      
      By default all files without license information are under the default
      license of the kernel, which is GPL version 2.
      
      Update the files which contain no license information with the 'GPL-2.0'
      SPDX license identifier.  The SPDX identifier is a legally binding
      shorthand, which can be used instead of the full boiler plate text.
      
      This patch is based on work done by Thomas Gleixner and Kate Stewart and
      Philippe Ombredanne.
      
      How this work was done:
      
      Patches were generated and checked against linux-4.14-rc6 for a subset of
      the use cases:
       - file had no licensing information it it.
       - file was a */uapi/* one with no licensing information in it,
       - file was a */uapi/* one with existing licensing information,
      
      Further patches will be generated in subsequent months to fix up cases
      where non-standard license headers were used, and references to license
      had to be inferred by heuristics based on keywords.
      
      The analysis to determine which SPDX License Identifier to be applied to
      a file was done in a spreadsheet of side by side results from of the
      output of two independent scanners (ScanCode & Windriver) producing SPDX
      tag:value files created by Philippe Ombredanne.  Philippe prepared the
      base worksheet, and did an initial spot review of a few 1000 files.
      
      The 4.13 kernel was the starting point of the analysis with 60,537 files
      assessed.  Kate Stewart did a file by file comparison of the scanner
      results in the spreadsheet to determine which SPDX license identifier(s)
      to be applied to the file. She confirmed any determination that was not
      immediately clear with lawyers working with the Linux Foundation.
      
      Criteria used to select files for SPDX license identifier tagging was:
       - Files considered eligible had to be source code files.
       - Make and config files were included as candidates if they contained >5
         lines of source
       - File already had some variant of a license header in it (even if <5
         lines).
      
      All documentation files were explicitly excluded.
      
      The following heuristics were used to determine which SPDX license
      identifiers to apply.
      
       - when both scanners couldn't find any license traces, file was
         considered to have no license information in it, and the top level
         COPYING file license applied.
      
         For non */uapi/* files that summary was:
      
         SPDX license identifier                            # files
         ---------------------------------------------------|-------
         GPL-2.0                                              11139
      
         and resulted in the first patch in this series.
      
         If that file was a */uapi/* path one, it was "GPL-2.0 WITH
         Linux-syscall-note" otherwise it was "GPL-2.0".  Results of that was:
      
         SPDX license identifier                            # files
         ---------------------------------------------------|-------
         GPL-2.0 WITH Linux-syscall-note                        930
      
         and resulted in the second patch in this series.
      
       - if a file had some form of licensing information in it, and was one
         of the */uapi/* ones, it was denoted with the Linux-syscall-note if
         any GPL family license was found in the file or had no licensing in
         it (per prior point).  Results summary:
      
         SPDX license identifier                            # files
         ---------------------------------------------------|------
         GPL-2.0 WITH Linux-syscall-note                       270
         GPL-2.0+ WITH Linux-syscall-note                      169
         ((GPL-2.0 WITH Linux-syscall-note) OR BSD-2-Clause)    21
         ((GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause)    17
         LGPL-2.1+ WITH Linux-syscall-note                      15
         GPL-1.0+ WITH Linux-syscall-note                       14
         ((GPL-2.0+ WITH Linux-syscall-note) OR BSD-3-Clause)    5
         LGPL-2.0+ WITH Linux-syscall-note                       4
         LGPL-2.1 WITH Linux-syscall-note                        3
         ((GPL-2.0 WITH Linux-syscall-note) OR MIT)              3
         ((GPL-2.0 WITH Linux-syscall-note) AND MIT)             1
      
         and that resulted in the third patch in this series.
      
       - when the two scanners agreed on the detected license(s), that became
         the concluded license(s).
      
       - when there was disagreement between the two scanners (one detected a
         license but the other didn't, or they both detected different
         licenses) a manual inspection of the file occurred.
      
       - In most cases a manual inspection of the information in the file
         resulted in a clear resolution of the license that should apply (and
         which scanner probably needed to revisit its heuristics).
      
       - When it was not immediately clear, the license identifier was
         confirmed with lawyers working with the Linux Foundation.
      
       - If there was any question as to the appropriate license identifier,
         the file was flagged for further research and to be revisited later
         in time.
      
      In total, over 70 hours of logged manual review was done on the
      spreadsheet to determine the SPDX license identifiers to apply to the
      source files by Kate, Philippe, Thomas and, in some cases, confirmation
      by lawyers working with the Linux Foundation.
      
      Kate also obtained a third independent scan of the 4.13 code base from
      FOSSology, and compared selected files where the other two scanners
      disagreed against that SPDX file, to see if there was new insights.  The
      Windriver scanner is based on an older version of FOSSology in part, so
      they are related.
      
      Thomas did random spot checks in about 500 files from the spreadsheets
      for the uapi headers and agreed with SPDX license identifier in the
      files he inspected. For the non-uapi files Thomas did random spot checks
      in about 15000 files.
      
      In initial set of patches against 4.14-rc6, 3 files were found to have
      copy/paste license identifier errors, and have been fixed to reflect the
      correct identifier.
      
      Additionally Philippe spent 10 hours this week doing a detailed manual
      inspection and review of the 12,461 patched files from the initial patch
      version early this week with:
       - a full scancode scan run, collecting the matched texts, detected
         license ids and scores
       - reviewing anything where there was a license detected (about 500+
         files) to ensure that the applied SPDX license was correct
       - reviewing anything where there was no detection but the patch license
         was not GPL-2.0 WITH Linux-syscall-note to ensure that the applied
         SPDX license was correct
      
      This produced a worksheet with 20 files needing minor correction.  This
      worksheet was then exported into 3 different .csv files for the
      different types of files to be modified.
      
      These .csv files were then reviewed by Greg.  Thomas wrote a script to
      parse the csv files and add the proper SPDX tag to the file, in the
      format that the file expected.  This script was further refined by Greg
      based on the output to detect more types of files automatically and to
      distinguish between header and source .c files (which need different
      comment types.)  Finally Greg ran the script using the .csv files to
      generate the patches.
      Reviewed-by: default avatarKate Stewart <kstewart@linuxfoundation.org>
      Reviewed-by: default avatarPhilippe Ombredanne <pombredanne@nexb.com>
      Reviewed-by: default avatarThomas Gleixner <tglx@linutronix.de>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      b2441318
  17. 23 Oct, 2017 1 commit
  18. 28 Sep, 2017 1 commit
  19. 21 Sep, 2017 1 commit
    • H Hartley Sweeten's avatar
      ARM: ep93xx: switch to SPARSEMEM · 80320927
      H Hartley Sweeten authored
      
      
      The EP93xx has four chip selects that can be used for the SDRAM memory.
      These chip selects are decoded to specify an address domain:
      
        SDCS3  0x00000000-0x0fffffff with Boot Option ASDO=1
        SDCS0  0xc0000000-0xcfffffff
        SDCS1  0xd0000000-0xdfffffff
        SDCS2  0xe0000000-x0efffffff
        SDCS3  0xf0000000-0xffffffff with Boot Option ASDO=0
      
      Because of the row/column/bank architecture of SDRAM, the mapping of
      these memories into the processor's memory space is discontiguous.
      
      Most ep93xx systems only use one of the chip selects. For these systems,
      ARCH_HAS_HOLES_MEMORYMODEL has worked fine to handle the discontiguous
      memory.
      
      But, some of the TS-72xx boards use multiple chip selects. The TS-7300 in
      particular uses SDCS3 (with ASDO=1) and SDCS2. On that system with
      ARCH_HAS_HOLES_MEMORYMODEL the SDCS2 memory does not get handled correctly
      and results in the system not booting.
      
      Change the EP93xx to ARCH_SPARSEMEM_ENABLE. This handles the discontiguous
      memory for all configurations.
      
      This has been tested on the following ep93xx platforms:
      
      EDB9307A with 64 MiB on SDCS0
      Vision EP9307 with 64 MiB on SDCS0
      TS-7300 with 64 MiB on SDCS3 (with ASDO=1) and 64 MiB on SDCS2
      sim.one with 64 MiB on SDCS0
      Signed-off-by: default avatarH Hartley Sweeten <hsweeten@visionengravers.com>
      Tested-by: default avatarLinus Walleij <linus.walleij@linaro.org>
      Cc: Russell King <linux@armlinux.org.uk>
      Tested-by: default avatarFlorian Fainelli <f.fainelli@gmail.com>
      Tested-by: default avatarAlexander Sverdlin <alexander.sverdlin@gmail.com>
      Signed-off-by: default avatarLinus Walleij <linus.walleij@linaro.org>
      80320927
  20. 10 Sep, 2017 1 commit
    • Nicolas Pitre's avatar
      ARM: XIP kernel: store .data compressed in ROM · ca8b5d97
      Nicolas Pitre authored
      
      
      The .data segment stored in ROM is only copied to RAM once at boot time
      and never referenced afterwards. This is arguably a suboptimal usage of
      ROM resources.
      
      This patch allows for compressing the .data segment before storing it
      into ROM and decompressing it to RAM rather than simply copying it,
      saving on precious ROM space.
      
      Because global data is not available yet (obviously) we must allocate
      decompressor workspace memory on the stack. The .bss area is used as a
      stack area for that purpose before it is cleared. The required stack
      frame is 9568 bytes for __inflate_kernel_data() alone, so make sure
      the .bss is large enough to cope with that plus extra room for called
      functions or fail the build.
      
      Those numbers were picked arbitrarily based on the above 9568 byte
      stack frame:
      
      10240 (2.5 * PAGE_SIZE): used to override -Wframe-larger-than whose
      default value is 1024.
      12288 (3 * PAGE_SIZE): minimum .bss size to contain the stack.
      Signed-off-by: default avatarNicolas Pitre <nico@linaro.org>
      Reviewed-by: default avatarArd Biesheuvel <ard.biesheuvel@linaro.org>
      Tested-by: default avatarChris Brandt <Chris.Brandt@renesas.com>
      ca8b5d97
  21. 22 Aug, 2017 1 commit
    • Shubham Bansal's avatar
      arm: eBPF JIT compiler · 39c13c20
      Shubham Bansal authored
      
      
      The JIT compiler emits ARM 32 bit instructions. Currently, It supports
      eBPF only. Classic BPF is supported because of the conversion by BPF core.
      
      This patch is essentially changing the current implementation of JIT compiler
      of Berkeley Packet Filter from classic to internal with almost all
      instructions from eBPF ISA supported except the following
      	BPF_ALU64 | BPF_DIV | BPF_K
      	BPF_ALU64 | BPF_DIV | BPF_X
      	BPF_ALU64 | BPF_MOD | BPF_K
      	BPF_ALU64 | BPF_MOD | BPF_X
      	BPF_STX | BPF_XADD | BPF_W
      	BPF_STX | BPF_XADD | BPF_DW
      
      Implementation is using scratch space to emulate 64 bit eBPF ISA on 32 bit
      ARM because of deficiency of general purpose registers on ARM. Currently,
      only LITTLE ENDIAN machines are supported in this eBPF JIT Compiler.
      
      Tested on ARMv7 with QEMU by me (Shubham Bansal).
      
      Testing results on ARMv7:
      
      1) test_bpf: Summary: 341 PASSED, 0 FAILED, [312/333 JIT'ed]
      2) test_tag: OK (40945 tests)
      3) test_progs: Summary: 30 PASSED, 0 FAILED
      4) test_lpm: OK
      5) test_lru_map: OK
      
      Above tests are all done with following flags enabled discreatly.
      
      1) bpf_jit_enable=1
      	a) CONFIG_FRAME_POINTER enabled
      	b) CONFIG_FRAME_POINTER disabled
      2) bpf_jit_enable=1 and bpf_jit_harden=2
      	a) CONFIG_FRAME_POINTER enabled
      	b) CONFIG_FRAME_POINTER disabled
      
      See Documentation/networking/filter.txt for more information.
      Signed-off-by: default avatarShubham Bansal <illusionist.neo@gmail.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      39c13c20
  22. 02 Aug, 2017 1 commit
    • Russell King's avatar
      ARM: always enable AEABI for ARMv6+ · 49460970
      Russell King authored
      
      
      Always enable AEABI for ARMv6+, as these use the double-word exclusives
      which must be passed an even register to avoid errors such as:
      
      /tmp/ccG2rCwe.s:905: Error: even register required -- `ldrexd r5,r6,[r7]'
      /tmp/ccG2rCwe.s:909: Error: even register required -- `strexd sl,r3,r4,[r7]'
      Signed-off-by: default avatarRussell King <rmk+kernel@armlinux.org.uk>
      49460970
  23. 27 Jul, 2017 1 commit
  24. 30 Jun, 2017 1 commit
  25. 21 Jun, 2017 2 commits
  26. 18 Jun, 2017 1 commit
    • Abel Vesa's avatar
      ARM: 8678/1: ftrace: Adds support for CONFIG_DYNAMIC_FTRACE_WITH_REGS · 620176f3
      Abel Vesa authored
      
      
      The DYNAMIC_FTRACE_WITH_REGS configuration makes it possible for a
      ftrace operation to specify if registers need to saved/restored by
      the ftrace handler. This is needed by kgraft and possibly other
      ftrace-based tools, and the ARM architecture is currently lacking
      this feature. It would also be the first step to support the
      "Kprobes-on-ftrace" optimization on ARM.
      
      This patch introduces a new ftrace handler that stores the registers
      on the stack before calling the next stage. The registers are restored
      from the stack before going back to the instrumented function.
      
      A side-effect of this patch is to activate the support for
      ftrace_modify_call() as it defines ARCH_SUPPORTS_FTRACE_OPS for the
      ARM architecture.
      Signed-off-by: default avatarAbel Vesa <abelvesa@linux.com>
      Signed-off-by: default avatarRussell King <rmk+kernel@armlinux.org.uk>
      620176f3
  27. 14 Jun, 2017 1 commit
  28. 13 Jun, 2017 1 commit
  29. 12 Jun, 2017 1 commit
  30. 05 Jun, 2017 1 commit
    • Ard Biesheuvel's avatar
      efi/arm: Enable DMI/SMBIOS · bb817bef
      Ard Biesheuvel authored
      
      
      Wire up the existing arm64 support for SMBIOS tables (aka DMI) for ARM as
      well, by moving the arm64 init code to drivers/firmware/efi/arm-runtime.c
      (which is shared between ARM and arm64), and adding a asm/dmi.h header to
      ARM that defines the mapping routines for the firmware tables.
      
      This allows userspace to access these tables to discover system information
      exposed by the firmware. It also sets the hardware name used in crash
      dumps, e.g.:
      
        Unable to handle kernel NULL pointer dereference at virtual address 00000000
        pgd = ed3c0000
        [00000000] *pgd=bf1f3835
        Internal error: Oops: 817 [#1] SMP THUMB2
        Modules linked in:
        CPU: 0 PID: 759 Comm: bash Not tainted 4.10.0-09601-g0e8f38792120-dirty #112
        Hardware name: QEMU KVM Virtual Machine, BIOS 0.0.0 02/06/2015
        ^^^
      
      NOTE: This does *NOT* enable or encourage the use of DMI quirks, i.e., the
            the practice of identifying the platform via DMI to decide whether
            certain workarounds for buggy hardware and/or firmware need to be
            enabled. This would require the DMI subsystem to be enabled much
            earlier than we do on ARM, which is non-trivial.
      Signed-off-by: default avatarArd Biesheuvel <ard.biesheuvel@linaro.org>
      Acked-by: default avatarRussell King <rmk+kernel@armlinux.org.uk>
      Cc: Linus Torvalds <torvalds@linux-foundation.org>
      Cc: Matt Fleming <matt@codeblueprint.co.uk>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: linux-efi@vger.kernel.org
      Link: http://lkml.kernel.org/r/20170602135207.21708-14-ard.biesheuvel@linaro.org
      
      Signed-off-by: default avatarIngo Molnar <mingo@kernel.org>
      bb817bef
  31. 03 Jun, 2017 1 commit
  32. 26 Apr, 2017 1 commit