1. 14 Dec, 2009 9 commits
    • Michal Simek's avatar
      microblaze: ftrace: add static function tracer · 2fd7c761
      Michal Simek authored
      If -pg of gcc is enabled with CONFIG_FUNCTION_TRACER=y. a calling to
      _mcount will be inserted into each kernel function. so, there is a
      possibility to trace the kernel functions in _mcount.
      
      This patch add the specific _mcount support for static function
      tracing. by default, ftrace_trace_function is initialized as
      ftrace_stub(an empty function), so, the default _mcount will introduce
      very little overhead. after enabling ftrace in user-space, it will jump
      to a real tracing function and do static function tracing for us.
      
      Commit message from Wu Zhangjin <wuzhangjin@gmail.com>
      Signed-off-by: default avatarMichal Simek <monstr@monstr.eu>
      2fd7c761
    • Michal Simek's avatar
      microblaze: Add TRACE_IRQFLAGS_SUPPORT · a3cd613b
      Michal Simek authored
      There are just two major changes
      Renamed local_irq functions to raw_local_irq in irq.c.
      Added TRACE_IRQFLAGS_SUPPORT to Kconfig.debug.
      
      Look at Documentation/irqflags-tracing.txt
      Signed-off-by: default avatarMichal Simek <monstr@monstr.eu>
      a3cd613b
    • Michal Simek's avatar
    • Michal Simek's avatar
      microblaze: Lockdep support · bf2d8096
      Michal Simek authored
      Microblaze needs to do lock_init very soon because MMU init calls lock functions.
      
      Here is the explanation from Peter Zijlstra why we have to enable
      __ARCH_WANTS_INTERRUPTS_ON_CTSW.
      
      "So we schedule while holding rq->lock (for obvious reasons), but since
      lockdep tracks held locks per tasks, we need to transfer the held state
      from the prev to the next task. We do this by explicity calling
      spin_release(&rq->lock) in context_switch() right before switch_to(),
      and calling spin_acquire(&rq->lock) in
      finish_task_switch()->finish_lock_switch().
      
      Now, for some reason lockdep thinks that interrupts got enabled over the
      context switch (git grep __ARCH_WANTS_INTERRUPTS_ON_CTSW arch/microblaze
      doesn't seem to turn up anything).
      
      Clearly trying to acquire the rq->lock with interrupts enabled is a bad
      idea and lockdep warns you about this."
      Signed-off-by: default avatarMichal Simek <monstr@monstr.eu>
      bf2d8096
    • Michal Simek's avatar
      microblaze: Register timecounter/cyclecounter · 519e9f41
      Michal Simek authored
      It is the same counter as we use as free running one.
      I would like to use it for ftrace.
      Signed-off-by: default avatarMichal Simek <monstr@monstr.eu>
      519e9f41
    • Michal Simek's avatar
      microblaze: Stack trace support · 24b45a12
      Michal Simek authored
      This is working implemetation but the problem is that
      Microblaze misses frame pointer that's why is there
      big loop which trace and show all addresses which are in text.
      It shows addresses which are in registers, etc.
      
      This is problem and this is the reason why all Microblaze
      traces are wrong. There is an option to do hacks and trace
      the kernel code but this is too complicated.
      Signed-off-by: default avatarMichal Simek <monstr@monstr.eu>
      24b45a12
    • Michal Simek's avatar
      microblaze: Add IRQENTRY_TEXT to lds · 7cf79d59
      Michal Simek authored
      It is important for ftrace irqsoff support
      Signed-off-by: default avatarMichal Simek <monstr@monstr.eu>
      7cf79d59
    • Michal Simek's avatar
      microblaze: __init_begin symbol must be aligned · 13cdee23
      Michal Simek authored
      The problem was that free_initmem pass to  free_initrd_mem got
      bad aligned __init_begin symbol and free_initrd_mem don't care
      about __init_end but take PAGE_SIZE instead.
      
      Here is behavior in kernel bootlog.
      ramdisk_execute_command from (init/main.c) was rewrite
      
      Freeing unused kernel memory: 6224k freed
      Failed to execute ��������������{���
      Failed to execute ��������������{����.  Attempting defaults...
      Mounting proc:
      Mounting var:
      Signed-off-by: default avatarMichal Simek <monstr@monstr.eu>
      13cdee23
    • Michal Simek's avatar
      microblaze: GPIO reset support · 42a2478b
      Michal Simek authored
      Signed-off-by: default avatarMichal Simek <monstr@monstr.eu>
      42a2478b
  2. 12 Dec, 2009 31 commits