[RFC PATCH 3/6] selftests/damon/_damon_sysfs: implement DamonProbes

[SJ Park]

Extend _damon_sysfs.py to support staging and committing DAMON probes.
It will be used for setting DAMON probes via sysfs changes for testing
purposes.

Signed-off-by: SJ Park <sj@xxxxxxxxxx>
---
 tools/testing/selftests/damon/_damon_sysfs.py | 123 +++++++++++++++++-
 1 file changed, 122 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/damon/_damon_sysfs.py b/tools/testing/selftests/damon/_damon_sysfs.py
index e6a2265d721e8..d6afb5b2f0a4a 100644
--- a/tools/testing/selftests/damon/_damon_sysfs.py
+++ b/tools/testing/selftests/damon/_damon_sysfs.py
@@ -558,6 +558,115 @@ class IntervalsGoal:
             return err
         return None
 
+class DamonFilter:
+    type_ = None
+    matching = None
+    allow = None
+    filters = None
+    path = None
+    idx = None
+
+    def __init__(self, type_='anon', matching=False, allow=False, path=None):
+        self.type_ = type_
+        self.matching = matching
+        self.allow = allow
+        self.path = path
+
+    def sysfs_dir(self):
+        return os.path.join(self.filters.sysfs_dir(), '%d' % self.idx)
+
+    def stage(self):
+        err = write_file(os.path.join(self.sysfs_dir(), 'type'), self.type_)
+        if err is not None:
+            return err
+        err = write_file(os.path.join(self.sysfs_dir(), 'matching'),
+                         'Y' if self.matching else 'N')
+        if err is not None:
+            return err
+        err = write_file(os.path.join(self.sysfs_dir(), 'allow'),
+                         'Y' if self.allow else 'N')
+        if err is not None:
+            return err
+        if self.type_ == 'memcg':
+            err = write_file(os.path.join(self.sysfs_dir(), 'path'), self.path)
+            if err is not None:
+                return err
+        return None
+
+class DamonFilters:
+    filters = None
+    probe = None
+
+    def __init__(self, filters=None):
+        if filters is None:
+            filters = []
+        self.filters = filters
+        for idx, filter in enumerate(self.filters):
+            filter.filters = self
+            filter.idx = idx
+
+    def sysfs_dir(self):
+        return os.path.join(self.probe.sysfs_dir(), 'filters')
+
+    def stage(self):
+        err = write_file(
+                os.path.join(self.sysfs_dir(), 'nr_filters'),
+                len(self.filters))
+        if err is not None:
+            return err
+        for filter in self.filters:
+            err = filter.stage()
+            if err is not None:
+                return err
+        return None
+
+class DamonProbe:
+    weight = None
+    filters = None
+    probes = None
+    idx = None
+
+    def __init__(self, weight=0, filters=None):
+        self.weight = weight
+        if filters is None:
+            filters = DamonFilters()
+        self.filters = filters
+        self.filters.probe = self
+
+    def sysfs_dir(self):
+        return os.path.join(self.probes.sysfs_dir(), '%d' % self.idx)
+
+    def stage(self):
+        err = write_file(
+                os.path.join(self.sysfs_dir(), 'weight'), '%d' % self.weight)
+        return self.filters.stage()
+
+class DamonProbes:
+    probes = None
+    attrs = None
+
+    def __init__(self, probes=None):
+        if probes is None:
+            probes = []
+        self.probes = probes
+        for idx, probe in enumerate(self.probes):
+            probe.probes = self
+            probe.idx = idx
+
+    def sysfs_dir(self):
+        return os.path.join(self.attrs.sysfs_dir(), 'probes')
+
+    def stage(self):
+        err = write_file(os.path.join(self.sysfs_dir(), 'nr_probes'),
+                         len(self.probes))
+        if err is not None:
+            return err
+        for probe in self.probes:
+            err = probe.stage()
+            if err is not None:
+                return err
+        return None
+
 class DamonAttrs:
     sample_us = None
     aggr_us = None
@@ -565,11 +674,12 @@ class DamonAttrs:
     update_us = None
     min_nr_regions = None
     max_nr_regions = None
+    probes = None
     context = None
 
     def __init__(self, sample_us=5000, aggr_us=100000,
                  intervals_goal=IntervalsGoal(), update_us=1000000,
-            min_nr_regions=10, max_nr_regions=1000):
+            min_nr_regions=10, max_nr_regions=1000, probes=None):
         self.sample_us = sample_us
         self.aggr_us = aggr_us
         self.intervals_goal = intervals_goal
@@ -577,6 +687,10 @@ class DamonAttrs:
         self.update_us = update_us
         self.min_nr_regions = min_nr_regions
         self.max_nr_regions = max_nr_regions
+        if probes is None:
+            probes = DamonProbes()
+        self.probes = probes
+        self.probes.attrs = self
 
     def interval_sysfs_dir(self):
         return os.path.join(self.context.sysfs_dir(), 'monitoring_attrs',
@@ -586,6 +700,9 @@ class DamonAttrs:
         return os.path.join(self.context.sysfs_dir(), 'monitoring_attrs',
                 'nr_regions')
 
+    def sysfs_dir(self):
+        return os.path.join(self.context.sysfs_dir(), 'monitoring_attrs')
+
     def stage(self):
         err = write_file(os.path.join(self.interval_sysfs_dir(), 'sample_us'),
                 self.sample_us)
@@ -615,6 +732,10 @@ class DamonAttrs:
         if err is not None:
             return err
 
+        err = self.probes.stage()
+        if err is not None:
+            return err
+
 class DamonCtx:
     ops = None
     monitoring_attrs = None
-- 
2.47.3