1. 12 9月, 2014 3 次提交
    • L
      arm64: kernel: introduce cpu_init_idle CPU operation · d64f84f6
      Lorenzo Pieralisi 提交于
      The CPUidle subsystem on ARM64 machines requires the idle states
      implementation back-end to initialize idle states parameter upon
      boot. This patch adds a hook in the CPU operations structure that
      should be initialized by the CPU operations back-end in order to
      provide a function that initializes cpu idle states.
      
      This patch also adds the infrastructure to arm64 kernel required
      to export the CPU operations based initialization interface, so
      that drivers (ie CPUidle) can use it when they are initialized
      at probe time.
      Reviewed-by: NCatalin Marinas <catalin.marinas@arm.com>
      Signed-off-by: NLorenzo Pieralisi <lorenzo.pieralisi@arm.com>
      Signed-off-by: NCatalin Marinas <catalin.marinas@arm.com>
      d64f84f6
    • L
      arm64: kernel: refactor the CPU suspend API for retention states · 714f5992
      Lorenzo Pieralisi 提交于
      CPU suspend is the standard kernel interface to be used to enter
      low-power states on ARM64 systems. Current cpu_suspend implementation
      by default assumes that all low power states are losing the CPU context,
      so the CPU registers must be saved and cleaned to DRAM upon state
      entry. Furthermore, the current cpu_suspend() implementation assumes
      that if the CPU suspend back-end method returns when called, this has
      to be considered an error regardless of the return code (which can be
      successful) since the CPU was not expected to return from a code path that
      is different from cpu_resume code path - eg returning from the reset vector.
      
      All in all this means that the current API does not cope well with low-power
      states that preserve the CPU context when entered (ie retention states),
      since first of all the context is saved for nothing on state entry for
      those states and a successful state entry can return as a normal function
      return, which is considered an error by the current CPU suspend
      implementation.
      
      This patch refactors the cpu_suspend() API so that it can be split in
      two separate functionalities. The arm64 cpu_suspend API just provides
      a wrapper around CPU suspend operation hook. A new function is
      introduced (for architecture code use only) for states that require
      context saving upon entry:
      
      __cpu_suspend(unsigned long arg, int (*fn)(unsigned long))
      
      __cpu_suspend() saves the context on function entry and calls the
      so called suspend finisher (ie fn) to complete the suspend operation.
      The finisher is not expected to return, unless it fails in which case
      the error is propagated back to the __cpu_suspend caller.
      
      The API refactoring results in the following pseudo code call sequence for a
      suspending CPU, when triggered from a kernel subsystem:
      
      /*
       * int cpu_suspend(unsigned long idx)
       * @idx: idle state index
       */
      {
      -> cpu_suspend(idx)
      	|---> CPU operations suspend hook called, if present
      		|--> if (retention_state)
      			|--> direct suspend back-end call (eg PSCI suspend)
      		     else
      			|--> __cpu_suspend(idx, &back_end_finisher);
      }
      
      By refactoring the cpu_suspend API this way, the CPU operations back-end
      has a chance to detect whether idle states require state saving or not
      and can call the required suspend operations accordingly either through
      simple function call or indirectly through __cpu_suspend() which carries out
      state saving and suspend finisher dispatching to complete idle state entry.
      Reviewed-by: NCatalin Marinas <catalin.marinas@arm.com>
      Reviewed-by: NHanjun Guo <hanjun.guo@linaro.org>
      Signed-off-by: NLorenzo Pieralisi <lorenzo.pieralisi@arm.com>
      Signed-off-by: NCatalin Marinas <catalin.marinas@arm.com>
      714f5992
    • L
      Documentation: arm: define DT idle states bindings · 3f8161b2
      Lorenzo Pieralisi 提交于
      ARM based platforms implement a variety of power management schemes that
      allow processors to enter idle states at run-time.
      The parameters defining these idle states vary on a per-platform basis forcing
      the OS to hardcode the state parameters in platform specific static tables
      whose size grows as the number of platforms supported in the kernel increases
      and hampers device drivers standardization.
      
      Therefore, this patch aims at standardizing idle state device tree bindings
      for ARM platforms. Bindings define idle state parameters inclusive of entry
      methods and state latencies, to allow operating systems to retrieve the
      configuration entries from the device tree and initialize the related power
      management drivers, paving the way for common code in the kernel to deal with
      idle states and removing the need for static data in current and previous
      kernel versions.
      
      ARM64 platforms require the DT to define an entry-method property
      for idle states.
      
      On system implementing PSCI as an enable-method to enter low-power
      states the PSCI CPU suspend method requires the power_state parameter to
      be passed to the PSCI CPU suspend function.
      
      This parameter is specific to a power state and platform specific,
      therefore must be provided by firmware to the OS in order to enable
      proper call sequence.
      
      Thus, this patch also adds a property in the PSCI bindings that
      describes how the PSCI CPU suspend power_state parameter should be
      defined in DT in all device nodes that rely on PSCI CPU suspend method usage.
      Acked-by: NCatalin Marinas <catalin.marinas@arm.com>
      Acked-by: NDaniel Lezcano <daniel.lezcano@linaro.org>
      Acked-by: NNicolas Pitre <nico@linaro.org>
      Reviewed-by: NRob Herring <robh@kernel.org>
      Reviewed-by: NSebastian Capella <sebcape@gmail.com>
      Signed-off-by: NLorenzo Pieralisi <lorenzo.pieralisi@arm.com>
      Signed-off-by: NCatalin Marinas <catalin.marinas@arm.com>
      3f8161b2
  2. 08 9月, 2014 11 次提交
  3. 07 9月, 2014 4 次提交
    • L
      Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm · 2b12164b
      Linus Torvalds 提交于
      Pull kvm fixes from Paolo Bonzini:
       "A smattering of bug fixes across most architectures"
      
      * tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm:
        powerpc/kvm/cma: Fix panic introduces by signed shift operation
        KVM: s390/mm: Fix guest storage key corruption in ptep_set_access_flags
        KVM: s390/mm: Fix storage key corruption during swapping
        arm/arm64: KVM: Complete WFI/WFE instructions
        ARM/ARM64: KVM: Nuke Hyp-mode tlbs before enabling MMU
        KVM: s390/mm: try a cow on read only pages for key ops
        KVM: s390: Fix user triggerable bug in dead code
      2b12164b
    • L
      Merge tag 'fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc · 56c22854
      Linus Torvalds 提交于
      Pull ARM SoC fixes from Kevin Hilman:
       "Another round of fixes from arm-soc land, which are mostly DT fixes
        for:
      
         - OMAP: handful of DT fixes devices on newly supported hardware
         - davinci: fix 2nd EDMA channel
         - ux500: extend previous pinctrl fix to another board
         - at91: clock registration fixes, compatibility string precision
      
        And one more fix for event cleanup in drivers/bus/arm-ccn"
      
      * tag 'fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc:
        bus: arm-ccn: Move event cleanup routine
        ARM: at91/dt: rm9200: fix usb clock definition
        ARM: at91: rm9200: fix clock registration
        ARM: at91/dt: sam9g20: set at91sam9g20 pllb driver
        ARM: dts: dra7-evm: Add vtt regulator support
        ARM: dts: dra7-evm: Fix spi1 mux documentation
        ARM: dts: am43x-epos-evm: Disable QSPI to prevent conflict with GPMC-NAND
        ARM: OMAP2+: gpmc: Don't complain if wait pin is used without r/w monitoring
        ARM: dts: am43xx-epos-evm: Don't use read/write wait monitoring
        ARM: dts: am437x-gp-evm: Don't use read/write wait monitoring
        ARM: dts: am437x-gp-evm: Use BCH16 ECC scheme instead of BCH8
        ARM: dts: am43x-epos-evm: Use BCH16 ECC scheme instead of BCH8
        ARM: dts: am4372: fix USB regs size
        ARM: dts: am437x-gp: switch i2c0 to 100KHz
        ARM: dts: dra7-evm: Fix 8th NAND partition's name
        ARM: dts: dra7-evm: Fix i2c3 pinmux and frequency
        ARM: ux500: disable msp2 node on Snowball
        ARM: edma: Fix configuration parsing for SoCs with multiple eDMA3 CC
        ARM: dts: set 'ti,set-rate-parent' for dpll4_m5x2 clock
      56c22854
    • L
      Merge tag 'xfs-for-linus-3.17-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/dgc/linux-xfs · 11e97398
      Linus Torvalds 提交于
      Pull xfs fixes from Dave Chinner:
       "The fixes all address recently discovered data corruption issues.
      
        The original Direct IO issue was discovered by Chris Mason @ Facebook
        on a production workload which mixed buffered reads with direct reads
        and writes IO to the same file.  The fix for that exposed other issues
        with page invalidation (exposed by millions of fsx operations) failing
        due to dirty buffers beyond EOF.
      
        Finally, the collapse_range code could also cause problems due to
        racing writeback changing the extent map while it was being shifted
        around.  The commits for that problem are simple mitigation fixes that
        prevent the problem from occuring.  A more robust fix for 3.18 that
        addresses the underlying problem is currently being worked on by
        Brian.
      
        Summary of fixes:
         - a direct IO read/buffered read data corruption
         - the associated fallout from the DIO data corruption fix
         - collapse range bugs that are potential data corruption issues"
      
      * tag 'xfs-for-linus-3.17-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/dgc/linux-xfs:
        xfs: trim eofblocks before collapse range
        xfs: xfs_file_collapse_range is delalloc challenged
        xfs: don't log inode unless extent shift makes extent modifications
        xfs: use ranged writeback and invalidation for direct IO
        xfs: don't zero partial page cache pages during O_DIRECT writes
        xfs: don't zero partial page cache pages during O_DIRECT writes
        xfs: don't dirty buffers beyond EOF
      11e97398
    • L
      Merge tag 'for-linus-20140905' of git://git.infradead.org/linux-mtd · 925e0ea4
      Linus Torvalds 提交于
      Pull mtd fixes from Brian Norris:
       "Two trivial MTD updates for 3.17-rc4:
      
         - a tiny comment tweak, to kill a bunch of DocBook warnings added
           during the merge window
      
         - a small fixup to the OTP routines' error handling"
      
      * tag 'for-linus-20140905' of git://git.infradead.org/linux-mtd:
        mtd: nand: fix DocBook warnings on nand_sdr_timings doc
        mtd: cfi_cmdset_0002: check return code for get_chip()
      925e0ea4
  4. 06 9月, 2014 5 次提交
  5. 05 9月, 2014 17 次提交