[PATCH] lib/i915/perf: Fix warning on codegen

[Lucas De Marchi <lucas.demarchi@intel.com>]

For a normal string, it's not correct to use just one backslash as
escape char as that conflicts with Python's escape. Use raw strings for
the regex patterns to avoid this problem. Fix the followin warnings:

[4/1809] Generating lib/i915-perf-registers-hsw with a custom command
/home/ldmartin/p/igt-gpu-tools/lib/i915/perf-configs/codegen.py:165: SyntaxWarning: invalid escape sequence '\$'
  m = re.search('\$GtSlice([0-9]+)XeCore([0-9]+)$', name)
/home/ldmartin/p/igt-gpu-tools/lib/i915/perf-configs/codegen.py:168: SyntaxWarning: invalid escape sequence '\$'
  m = re.search('\$GtSlice([0-9]+)$', name)
/home/ldmartin/p/igt-gpu-tools/lib/i915/perf-configs/codegen.py:171: SyntaxWarning: invalid escape sequence '\$'
  m = re.search('\$GtSlice([0-9]+)DualSubslice([0-9]+)$', name)
/home/ldmartin/p/igt-gpu-tools/lib/i915/perf-configs/codegen.py:341: SyntaxWarning: invalid escape sequence '\$'
  m = re.search('\$GtSlice([0-9]+)$', name)
/home/ldmartin/p/igt-gpu-tools/lib/i915/perf-configs/codegen.py:344: SyntaxWarning: invalid escape sequence '\$'
  m = re.search('\$GtSlice([0-9]+)DualSubslice([0-9]+)$', name)
/home/ldmartin/p/igt-gpu-tools/lib/i915/perf-configs/codegen.py:347: SyntaxWarning: invalid escape sequence '\$'
  m = re.search('\$GtSlice([0-9]+)XeCore([0-9]+)$', name)

Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
---
 lib/i915/perf-configs/codegen.py | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/lib/i915/perf-configs/codegen.py b/lib/i915/perf-configs/codegen.py
index 020e76ef4..0d1847592 100644
--- a/lib/i915/perf-configs/codegen.py
+++ b/lib/i915/perf-configs/codegen.py
@@ -162,13 +162,13 @@ hw_vars_mapping = {
 }
 
 def is_hw_var(name):
-    m = re.search('\$GtSlice([0-9]+)XeCore([0-9]+)$', name)
+    m = re.search(r'\$GtSlice([0-9]+)XeCore([0-9]+)$', name)
     if m:
         return True
-    m = re.search('\$GtSlice([0-9]+)$', name)
+    m = re.search(r'\$GtSlice([0-9]+)$', name)
     if m:
         return True
-    m = re.search('\$GtSlice([0-9]+)DualSubslice([0-9]+)$', name)
+    m = re.search(r'\$GtSlice([0-9]+)DualSubslice([0-9]+)$', name)
     if m:
         return True
     return name in hw_vars_mapping
@@ -338,13 +338,13 @@ class Gen:
             return self.hw_vars[name]['c']
         if name in set.counter_vars:
             return set.read_funcs[name] + "(perf, metric_set, accumulator)"
-        m = re.search('\$GtSlice([0-9]+)$', name)
+        m = re.search(r'\$GtSlice([0-9]+)$', name)
         if m:
             return 'intel_perf_devinfo_slice_available(&perf->devinfo, {0})'.format(m.group(1))
-        m = re.search('\$GtSlice([0-9]+)DualSubslice([0-9]+)$', name)
+        m = re.search(r'\$GtSlice([0-9]+)DualSubslice([0-9]+)$', name)
         if m:
             return 'intel_perf_devinfo_subslice_available(&perf->devinfo, {0}, {1})'.format(m.group(1), m.group(2))
-        m = re.search('\$GtSlice([0-9]+)XeCore([0-9]+)$', name)
+        m = re.search(r'\$GtSlice([0-9]+)XeCore([0-9]+)$', name)
         if m:
             return 'intel_perf_devinfo_subslice_available(&perf->devinfo, {0}, {1})'.format(m.group(1), m.group(2))
         return None
-- 
2.45.0