[RFC PATCH 7/9] selftets/damon/_damon_sysfs: support failed region quota charge ratio

[SeongJae Park]

Extend _damon_sysfs.py for DAMOS action failed regions quota charge
ratio setup, so that we can add kselftest for the new feature.

Signed-off-by: SeongJae Park <sj@xxxxxxxxxx>
---
 tools/testing/selftests/damon/_damon_sysfs.py | 21 +++++++++++++++++--
 1 file changed, 19 insertions(+), 2 deletions(-)

diff --git a/tools/testing/selftests/damon/_damon_sysfs.py b/tools/testing/selftests/damon/_damon_sysfs.py
index 120b96ecbd741..8b12cc0484405 100644
--- a/tools/testing/selftests/damon/_damon_sysfs.py
+++ b/tools/testing/selftests/damon/_damon_sysfs.py
@@ -132,14 +132,17 @@ class DamosQuota:
     goals = None                # quota goals
     goal_tuner = None           # quota goal tuner
     reset_interval_ms = None    # quota reset interval
+    fail_charge_num = None
+    fail_charge_denom = None
     weight_sz_permil = None
     weight_nr_accesses_permil = None
     weight_age_permil = None
     scheme = None               # owner scheme
 
     def __init__(self, sz=0, ms=0, goals=None, goal_tuner='consist',
-                 reset_interval_ms=0, weight_sz_permil=0,
-                 weight_nr_accesses_permil=0, weight_age_permil=0):
+                 reset_interval_ms=0, fail_charge_num=0, fail_charge_denom=0,
+                 weight_sz_permil=0, weight_nr_accesses_permil=0,
+                 weight_age_permil=0):
         self.sz = sz
         self.ms = ms
         self.reset_interval_ms = reset_interval_ms
@@ -151,6 +154,8 @@ class DamosQuota:
         for idx, goal in enumerate(self.goals):
             goal.idx = idx
             goal.quota = self
+        self.fail_charge_num = fail_charge_num
+        self.fail_charge_denom = fail_charge_denom
 
     def sysfs_dir(self):
         return os.path.join(self.scheme.sysfs_dir(), 'quotas')
@@ -197,6 +202,18 @@ class DamosQuota:
                 os.path.join(self.sysfs_dir(), 'goal_tuner'), self.goal_tuner)
         if err is not None:
             return err
+
+        err = write_file(
+                os.path.join(self.sysfs_dir(), 'fail_charge_num'),
+                self.fail_charge_num)
+        if err is not None:
+            return err
+        err = write_file(
+                os.path.join(self.sysfs_dir(), 'fail_charge_denom'),
+                self.fail_charge_denom)
+        if err is not None:
+            return err
+
         return None
 
 class DamosWatermarks:
-- 
2.47.3