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Date:   Mon, 11 May 2020 08:28:55 +0530
From:   Ravi Bangoria <>
Subject: [PATCH v5 00/16] powerpc/watchpoint: Preparation for more than one watchpoint

So far, powerpc Book3S code has been written with an assumption of
only one watchpoint. But Power10[1] is introducing second watchpoint
register (DAWR). Even though this patchset does not enable 2nd DAWR,
it makes the infrastructure ready so that enabling 2nd DAWR should
just be a matter of changing count.

Existing functionality works fine with the patchset. I've tested it
with perf, ptrace(gdb), xmon. All hw-breakpoint selftests are passing
as well. And I've build tested for 8xx and 'AMCC 44x, 46x or 47x'.

Note: kvm or PowerVM guest is not enabled yet.


 - s/future power architecture/Power10/
 - s/dawr/DAWR/ in commit descriptions


Ravi Bangoria (16):
  powerpc/watchpoint: Rename current DAWR macros
  powerpc/watchpoint: Add SPRN macros for second DAWR
  powerpc/watchpoint: Introduce function to get nr watchpoints
  powerpc/watchpoint/ptrace: Return actual num of available watchpoints
  powerpc/watchpoint: Provide DAWR number to set_dawr
  powerpc/watchpoint: Provide DAWR number to __set_breakpoint
  powerpc/watchpoint: Get watchpoint count dynamically while disabling
  powerpc/watchpoint: Disable all available watchpoints when
  powerpc/watchpoint: Convert thread_struct->hw_brk to an array
  powerpc/watchpoint: Use loop for thread_struct->ptrace_bps
  powerpc/watchpoint: Introduce is_ptrace_bp() function
  powerpc/watchpoint: Use builtin ALIGN*() macros
  powerpc/watchpoint: Prepare handler to handle more than one
  powerpc/watchpoint: Don't allow concurrent perf and ptrace events
  powerpc/watchpoint/xmon: Don't allow breakpoint overwriting
  powerpc/watchpoint/xmon: Support 2nd DAWR

 arch/powerpc/include/asm/cputable.h       |   6 +-
 arch/powerpc/include/asm/debug.h          |   2 +-
 arch/powerpc/include/asm/hw_breakpoint.h  |  32 +-
 arch/powerpc/include/asm/processor.h      |   6 +-
 arch/powerpc/include/asm/reg.h            |   6 +-
 arch/powerpc/include/asm/sstep.h          |   2 +
 arch/powerpc/kernel/dawr.c                |  23 +-
 arch/powerpc/kernel/hw_breakpoint.c       | 645 ++++++++++++++++++----
 arch/powerpc/kernel/process.c             |  85 +--
 arch/powerpc/kernel/ptrace/ptrace-noadv.c |  72 ++-
 arch/powerpc/kernel/ptrace/ptrace32.c     |   4 +-
 arch/powerpc/kernel/signal.c              |  13 +-
 arch/powerpc/kvm/book3s_hv.c              |  12 +-
 arch/powerpc/kvm/book3s_hv_rmhandlers.S   |  18 +-
 arch/powerpc/xmon/xmon.c                  |  99 +++-
 kernel/events/hw_breakpoint.c             |  16 +
 16 files changed, 814 insertions(+), 227 deletions(-)


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