1. 31 7月, 2016 1 次提交
  2. 10 5月, 2016 1 次提交
  3. 14 10月, 2015 2 次提交
    • H
      s390/udelay: make udelay have busy loop semantics · db7e007f
      Heiko Carstens 提交于
      When using systemtap it was observed that our udelay implementation is
      rather suboptimal if being called from a kprobe handler installed by
      systemtap.
      
      The problem observed when a kprobe was installed on lock_acquired().
      When the probe was hit the kprobe handler did call udelay, which set
      up an (internal) timer and reenabled interrupts (only the clock comparator
      interrupt) and waited for the interrupt.
      This is an optimization to avoid that the cpu is busy looping while waiting
      that enough time passes. The problem is that the interrupt handler still
      does call irq_enter()/irq_exit() which then again can lead to a deadlock,
      since some accounting functions may take locks as well.
      
      If one of these locks is the same, which caused lock_acquired() to be
      called, we have a nice deadlock.
      
      This patch reworks the udelay code for the interrupts disabled case to
      immediately leave the low level interrupt handler when the clock
      comparator interrupt happens. That way no C code is being called and the
      deadlock cannot happen anymore.
      Signed-off-by: NHeiko Carstens <heiko.carstens@de.ibm.com>
      Reviewed-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>
      Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>
      db7e007f
    • H
      s390/fpu: always enable the vector facility if it is available · b5510d9b
      Hendrik Brueckner 提交于
      If the kernel detects that the s390 hardware supports the vector
      facility, it is enabled by default at an early stage.  To force
      it off, use the novx kernel parameter.  Note that there is a small
      time window, where the vector facility is enabled before it is
      forced to be off.
      
      With enabling the vector facility by default, the FPU save and
      restore functions can be improved.  They do not longer require
      to manage expensive control register updates to enable or disable
      the vector enablement control for particular processes.
      Signed-off-by: NHendrik Brueckner <brueckner@linux.vnet.ibm.com>
      Reviewed-by: NHeiko Carstens <heiko.carstens@de.ibm.com>
      Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>
      b5510d9b
  4. 08 1月, 2015 1 次提交
  5. 19 11月, 2014 1 次提交
  6. 09 10月, 2014 2 次提交
    • M
      s390: add support for vector extension · 80703617
      Martin Schwidefsky 提交于
      The vector extension introduces 32 128-bit vector registers and a set of
      instruction to operate on the vector registers.
      
      The kernel can control the use of vector registers for the problem state
      program with a bit in control register 0. Once enabled for a process the
      kernel needs to retain the content of the vector registers on context
      switch. The signal frame is extended to include the vector registers.
      Two new register sets NT_S390_VXRS_LOW and NT_S390_VXRS_HIGH are added
      to the regset interface for the debugger and core dumps.
      Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>
      80703617
    • M
      s390/idle: consolidate idle functions and definitions · b5f87f15
      Martin Schwidefsky 提交于
      Move the C functions and definitions related to the idle state handling
      to arch/s390/include/asm/idle.h and arch/s390/kernel/idle.c. The function
      s390_get_idle_time is renamed to arch_cpu_idle_time and vtime_stop_cpu to
      enabled_wait.
      Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>
      b5f87f15
  7. 25 9月, 2014 1 次提交
  8. 06 8月, 2014 1 次提交
  9. 06 3月, 2014 1 次提交
  10. 04 3月, 2014 2 次提交
  11. 04 11月, 2013 1 次提交
    • M
      s390/mm,tlb: correct tlb flush on page table upgrade · 10607864
      Martin Schwidefsky 提交于
      The IDTE instruction used to flush TLB entries for a specific address
      space uses the address-space-control element (ASCE) to identify
      affected TLB entries. The upgrade of a page table adds a new top
      level page table which changes the ASCE. The TLB entries associated
      with the old ASCE need to be flushed and the ASCE for the address space
      needs to be replaced synchronously on all CPUs which currently use it.
      The concept of a lazy ASCE update with an exception handler is broken.
      Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>
      10607864
  12. 07 9月, 2013 1 次提交
  13. 27 6月, 2013 1 次提交
  14. 17 4月, 2013 1 次提交
  15. 04 2月, 2013 3 次提交
  16. 29 11月, 2012 1 次提交
  17. 23 11月, 2012 1 次提交
  18. 01 10月, 2012 1 次提交
  19. 20 7月, 2012 1 次提交
  20. 02 6月, 2012 1 次提交
  21. 11 3月, 2012 3 次提交
    • H
      [S390] irq: external interrupt code passing · fde15c3a
      Heiko Carstens 提交于
      The external interrupt handlers have a parameter called ext_int_code.
      Besides the name this paramter does not only contain the ext_int_code
      but in addition also the "cpu address" (POP) which caused the external
      interrupt.
      To make the code a bit more obvious pass a struct instead so the called
      function can easily distinguish between external interrupt code and
      cpu address. The cpu address field however is named "subcode" since
      some external interrupt sources do not pass a cpu address but a
      different parameter (or none at all).
      Signed-off-by: NHeiko Carstens <heiko.carstens@de.ibm.com>
      Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>
      fde15c3a
    • M
      [S390] rework idle code · 4c1051e3
      Martin Schwidefsky 提交于
      Whenever the cpu loads an enabled wait PSW it will appear as idle to the
      underlying host system. The code in default_idle calls vtime_stop_cpu
      which does the necessary voodoo to get the cpu time accounting right.
      The udelay code just loads an enabled wait PSW. To correct this rework
      the vtime_stop_cpu/vtime_start_cpu logic and move the difficult parts
      to entry[64].S, vtime_stop_cpu can now be called from anywhere and
      vtime_start_cpu is gone. The correction of the cpu time during wakeup
      from an enabled wait PSW is done with a critical section in entry[64].S.
      As vtime_start_cpu is gone, s390_idle_check can be removed as well.
      Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>
      4c1051e3
    • M
      [S390] rework smp code · 8b646bd7
      Martin Schwidefsky 提交于
      Define struct pcpu and merge some of the NR_CPUS arrays into it, including
      __cpu_logical_map, current_set and smp_cpu_state. Split smp related
      functions to those operating on physical cpus and the functions operating
      on a logical cpu number. Make the functions for physical cpus use a
      pointer to a struct pcpu. This hides the knowledge about cpu addresses in
      smp.c, entry[64].S and swsusp_asm64.S, thus remove the sigp.h header.
      
      The PSW restart mechanism is used to start secondary cpus, calling a
      function on an online cpu, calling a function on the ipl cpu, and for
      the nmi signal. Replace the different assembler functions with a
      single function restart_int_handler. The new entry point calls a function
      whose pointer is stored in the lowcore of the target cpu and it can wait
      for the source cpu to stop. This covers all existing use cases.
      
      Overall the code is now simpler and there are ~380 lines less code.
      Reviewed-by: NHeiko Carstens <heiko.carstens@de.ibm.com>
      Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>
      8b646bd7
  22. 27 12月, 2011 1 次提交
    • M
      [S390] cleanup trap handling · aa33c8cb
      Martin Schwidefsky 提交于
      Move the program interruption code and the translation exception identifier
      to the pt_regs structure as 'int_code' and 'int_parm_long' and make the
      first level interrupt handler in entry[64].S store the two values. That
      makes it possible to drop 'prot_addr' and 'trap_no' from the thread_struct
      and to reduce the number of arguments to a lot of functions. Finally
      un-inline do_trap. Overall this saves 5812 bytes in the .text section of
      the 64 bit kernel.
      Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>
      aa33c8cb
  23. 30 10月, 2011 1 次提交
  24. 24 7月, 2011 1 次提交
  25. 05 1月, 2011 1 次提交
  26. 25 10月, 2010 2 次提交
  27. 24 8月, 2010 1 次提交
  28. 14 8月, 2010 1 次提交
  29. 13 8月, 2010 1 次提交
  30. 13 3月, 2010 3 次提交
    • C
      improve sys_newuname() for compat architectures · e28cbf22
      Christoph Hellwig 提交于
      On an architecture that supports 32-bit compat we need to override the
      reported machine in uname with the 32-bit value.  Instead of doing this
      separately in every architecture introduce a COMPAT_UTS_MACHINE define in
      <asm/compat.h> and apply it directly in sys_newuname().
      Signed-off-by: NChristoph Hellwig <hch@lst.de>
      Cc: Ralf Baechle <ralf@linux-mips.org>
      Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
      Cc: Paul Mundt <lethal@linux-sh.org>
      Cc: Jeff Dike <jdike@addtoit.com>
      Cc: Hirokazu Takata <takata@linux-m32r.org>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: Ingo Molnar <mingo@elte.hu>
      Cc: H. Peter Anvin <hpa@zytor.com>
      Cc: Al Viro <viro@zeniv.linux.org.uk>
      Cc: Arnd Bergmann <arnd@arndb.de>
      Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
      Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
      Cc: "Luck, Tony" <tony.luck@intel.com>
      Cc: James Morris <jmorris@namei.org>
      Cc: Andreas Schwab <schwab@linux-m68k.org>
      Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
      e28cbf22
    • C
      Add generic sys_ipc wrapper · baed7fc9
      Christoph Hellwig 提交于
      Add a generic implementation of the ipc demultiplexer syscall.  Except for
      s390 and sparc64 all implementations of the sys_ipc are nearly identical.
      
      There are slight differences in the types of the parameters, where mips
      and powerpc as the only 64-bit architectures with sys_ipc use unsigned
      long for the "third" argument as it gets casted to a pointer later, while
      it traditionally is an "int" like most other paramters.  frv goes even
      further and uses unsigned long for all parameters execept for "ptr" which
      is a pointer type everywhere.  The change from int to unsigned long for
      "third" and back to "int" for the others on frv should be fine due to the
      in-register calling conventions for syscalls (we already had a similar
      issue with the generic sys_ptrace), but I'd prefer to have the arch
      maintainers looks over this in details.
      
      Except for that h8300, m68k and m68knommu lack an impplementation of the
      semtimedop sub call which this patch adds, and various architectures have
      gets used - at least on i386 it seems superflous as the compat code on
      x86-64 and ia64 doesn't even bother to implement it.
      
      [akpm@linux-foundation.org: add sys_ipc to sys_ni.c]
      Signed-off-by: NChristoph Hellwig <hch@lst.de>
      Cc: Ralf Baechle <ralf@linux-mips.org>
      Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
      Cc: Paul Mundt <lethal@linux-sh.org>
      Cc: Jeff Dike <jdike@addtoit.com>
      Cc: Hirokazu Takata <takata@linux-m32r.org>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: Ingo Molnar <mingo@elte.hu>
      Reviewed-by: NH. Peter Anvin <hpa@zytor.com>
      Cc: Al Viro <viro@zeniv.linux.org.uk>
      Cc: Arnd Bergmann <arnd@arndb.de>
      Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
      Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
      Cc: "Luck, Tony" <tony.luck@intel.com>
      Cc: James Morris <jmorris@namei.org>
      Cc: Andreas Schwab <schwab@linux-m68k.org>
      Acked-by: NJesper Nilsson <jesper.nilsson@axis.com>
      Acked-by: NRussell King <rmk+kernel@arm.linux.org.uk>
      Acked-by: NDavid Howells <dhowells@redhat.com>
      Acked-by: NKyle McMartin <kyle@mcmartin.ca>
      Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
      baed7fc9
    • C
      Add generic sys_old_mmap() · a4679373
      Christoph Hellwig 提交于
      Add a generic implementation of the old mmap() syscall, which expects its
      argument in a memory block and switch all architectures over to use it.
      Signed-off-by: NChristoph Hellwig <hch@lst.de>
      Cc: Ralf Baechle <ralf@linux-mips.org>
      Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
      Cc: Paul Mundt <lethal@linux-sh.org>
      Cc: Jeff Dike <jdike@addtoit.com>
      Cc: Hirokazu Takata <takata@linux-m32r.org>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: Ingo Molnar <mingo@elte.hu>
      Reviewed-by: NH. Peter Anvin <hpa@zytor.com>
      Cc: Al Viro <viro@zeniv.linux.org.uk>
      Cc: Arnd Bergmann <arnd@arndb.de>
      Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
      Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
      Cc: "Luck, Tony" <tony.luck@intel.com>
      Cc: James Morris <jmorris@namei.org>
      Cc: Andreas Schwab <schwab@linux-m68k.org>
      Acked-by: NJesper Nilsson <jesper.nilsson@axis.com>
      Acked-by: NRussell King <rmk+kernel@arm.linux.org.uk>
      Acked-by: NGreg Ungerer <gerg@uclinux.org>
      Acked-by: NDavid Howells <dhowells@redhat.com>
      Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
      a4679373