x86, tracing, perf: Add trace point for MSR accesses

[linux-2.6-microblaze.git] / Documentation / trace / postprocess / decode_msr.py

diff --git a/Documentation/trace/postprocess/decode_msr.py b/Documentation/trace/postprocess/decode_msr.py
new file mode 100644 (file)
index 0000000..0ab40e0
--- /dev/null
+++ b/Documentation/trace/postprocess/decode_msr.py
@@ -0,0 +1,37 @@
+#!/usr/bin/python
+# add symbolic names to read_msr / write_msr in trace
+# decode_msr msr-index.h < trace
+import sys
+import re
+
+msrs = dict()
+
+with open(sys.argv[1] if len(sys.argv) > 1 else "msr-index.h", "r") as f:
+       for j in f:
+               m = re.match(r'#define (MSR_\w+)\s+(0x[0-9a-fA-F]+)', j)
+               if m:
+                       msrs[int(m.group(2), 16)] = m.group(1)
+
+extra_ranges = (
+       ( "MSR_LASTBRANCH_%d_FROM_IP", 0x680, 0x69F ),
+       ( "MSR_LASTBRANCH_%d_TO_IP", 0x6C0, 0x6DF ),
+       ( "LBR_INFO_%d", 0xdc0, 0xddf ),
+)
+
+for j in sys.stdin:
+       m = re.search(r'(read|write)_msr:\s+([0-9a-f]+)', j)
+       if m:
+               r = None
+               num = int(m.group(2), 16)
+               if num in msrs:
+                       r = msrs[num]
+               else:
+                       for er in extra_ranges:
+                               if er[1] <= num <= er[2]:
+                                       r = er[0] % (num - er[1],)
+                                       break
+               if r:
+                       j = j.replace(" " + m.group(2), " " + r + "(" + m.group(2) + ")")
+       print j,
+
+