Merge branch 'perf-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

* 'perf-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: (30 commits)
  trace, filters: Initialize the match variable in process_ops() properly
  trace, documentation: Fix branch profiling location in debugfs
  oprofile, s390: Cleanups
  oprofile, s390: Remove hwsampler_files.c and merge it into init.c
  perf: Fix tear-down of inherited group events
  perf: Reorder & optimize perf_event_context to remove alignment padding on 64 bit builds
  perf: Handle stopped state with tracepoints
  perf: Fix the software events state check
  perf, powerpc: Handle events that raise an exception without overflowing
  perf, x86: Use INTEL_*_CONSTRAINT() for all PEBS event constraints
  perf, x86: Clean up SandyBridge PEBS events
  perf lock: Fix sorting by wait_min
  perf tools: Version incorrect with some versions of grep
  perf evlist: New command to list the names of events present in a perf.data file
  perf script: Add support for H/W and S/W events
  perf script: Add support for dumping symbols
  perf script: Support custom field selection for output
  perf script: Move printing of 'common' data from print_event and rename
  perf tracing: Remove print_graph_cpu and print_graph_proc from trace-event-parse
  perf script: Change process_event prototype
  ...

2 files changed, 24 insertions, 1 deletions

diff --git a/arch/powerpc/include/asm/reg.h b/arch/powerpc/include/asm/reg.h
index 1bc6a12f3725..7e4abebe76c0 100644
--- a/arch/powerpc/include/asm/reg.h
+++ b/arch/powerpc/include/asm/reg.h
@@ -892,6 +892,7 @@
 #define PV_970          0x0039
 #define PV_POWER5       0x003A
 #define PV_POWER5p      0x003B
+#define PV_POWER7       0x003F
 #define PV_970FX        0x003C
 #define PV_630          0x0040
 #define PV_630p 0x0041
diff --git a/arch/powerpc/kernel/perf_event.c b/arch/powerpc/kernel/perf_event.c
index ab6f6beadb57..97e0ae414940 100644
--- a/arch/powerpc/kernel/perf_event.c
+++ b/arch/powerpc/kernel/perf_event.c
@@ -1269,6 +1269,28 @@ unsigned long perf_instruction_pointer(struct pt_regs *regs)
         return ip;
 }
 
+static bool pmc_overflow(unsigned long val)
+{
+        if ((int)val < 0)
+                return true;
+
+        /*
+         * Events on POWER7 can roll back if a speculative event doesn't
+         * eventually complete. Unfortunately in some rare cases they will
+         * raise a performance monitor exception. We need to catch this to
+         * ensure we reset the PMC. In all cases the PMC will be 256 or less
+         * cycles from overflow.
+         *
+         * We only do this if the first pass fails to find any overflowing
+         * PMCs because a user might set a period of less than 256 and we
+         * don't want to mistakenly reset them.
+         */
+        if (__is_processor(PV_POWER7) && ((0x80000000 - val) <= 256))
+                return true;
+
+        return false;
+}
+
 /*
  * Performance monitor interrupt stuff
  */
@@ -1316,7 +1338,7 @@ static void perf_event_interrupt(struct pt_regs *regs)
                         if (is_limited_pmc(i + 1))
                                 continue;
                         val = read_pmc(i + 1);
-                        if ((int)val < 0)
+                        if (pmc_overflow(val))
                                 write_pmc(i + 1, 0);
                 }
         }