Pg/mod config v1

lisa/_assets/kmodules/lisa/Makefile

@@ -68,7 +68,7 @@ ifneq ($(KERNELRELEASE),)
 
 LISA_KMOD_NAME ?= lisa
 obj-m := $(LISA_KMOD_NAME).o
-$(LISA_KMOD_NAME)-y := main.o tp.o wq.o features.o pixel6.o introspection_data.o
+$(LISA_KMOD_NAME)-y := main.o tp.o wq.o features.o pixel6.o introspection_data.o configs.o fs.o feature_params.o
 
 # -fno-stack-protector is needed to possibly undefined __stack_chk_guard symbol
 ccflags-y := "-I$(MODULE_SRC)" -std=gnu11 -fno-stack-protector -Wno-declaration-after-statement -Wno-error

lisa/_assets/kmodules/lisa/configs.c

@@ -0,0 +1,165 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+
+#include <linux/fs.h>
+
+#include "configs.h"
+#include "feature_params.h"
+
+void lisa_fs_remove(struct dentry *dentry);
+
+struct lisa_cfg *allocate_lisa_cfg(const char *name)
+{
+	struct lisa_cfg *cfg;
+
+	cfg = kzalloc(sizeof(*cfg), GFP_KERNEL);
+	if (!cfg)
+		return NULL;
+
+	cfg->name = kstrdup(name, GFP_KERNEL);
+	if (!cfg->name)
+		goto error;
+
+	return cfg;
+
+error:
+	kfree(cfg);
+	return NULL;
+}
+
+void init_lisa_cfg(struct lisa_cfg *cfg, struct hlist_head *cfg_list,
+		  struct dentry *dentry)
+{
+	cfg->dentry = dentry;
+	hlist_add_head(&cfg->node, cfg_list);
+}
+
+void free_lisa_cfg(struct lisa_cfg *cfg)
+{
+	/* De-activate the config. */
+	activate_lisa_cfg(cfg, false);
+	drain_feature_param_entry_cfg(&cfg->list_param);
+
+	/* Remove its dentries. */
+	if (cfg->dentry)
+		lisa_fs_remove(cfg->dentry);
+
+	hlist_del(&cfg->node);
+	kfree(cfg->name);
+	kfree(cfg);
+}
+
+void drain_lisa_cfg(struct hlist_head *head)
+{
+	struct hlist_node *tmp;
+	struct lisa_cfg *cfg;
+
+	hlist_for_each_entry_safe(cfg, tmp, head, node)
+		free_lisa_cfg(cfg);
+}
+
+struct lisa_cfg *find_lisa_cfg(struct hlist_head *cfg_list, const char *name)
+{
+	struct lisa_cfg *cfg;
+
+	hlist_for_each_entry(cfg, cfg_list, node) {
+		if (!strcmp(cfg->name, name))
+			return cfg;
+	}
+	return NULL;
+}
+
+static int update_global_value(struct lisa_cfg *cfg, int new_value)
+{
+	struct feature_param_entry *entry, *rollback_entry;
+	int ret = 0;
+
+	/* For each parameter of the config. */
+	hlist_for_each_entry(entry, &cfg->list_param, node_cfg) {
+		if (!list_empty(&entry->list_values)) {
+			/* For each value of this entry. */
+			if (new_value)
+				ret = feature_param_merge_common(entry);
+			else
+				ret = feature_param_remove_config_common(entry);
+			if (ret) {
+				rollback_entry = entry;
+				goto rollback;
+			}
+		}
+	}
+
+	return ret;
+
+rollback:
+	hlist_for_each_entry(entry, &cfg->list_param, node_cfg) {
+		if (entry == rollback_entry)
+			break;
+
+		if (!list_empty(&entry->list_values)) {
+			/* For each value of this entry. */
+			if (new_value)
+				ret = feature_param_remove_config_common(entry);
+			else
+				ret = feature_param_merge_common(entry);
+			if (ret) {
+				pr_err("Could not rollback config values\n");
+				return ret;
+			}
+		}
+	}
+
+	return ret;
+}
+
+static bool is_feature_set(char *name)
+{
+	struct feature_param_entry_value *val;
+
+	/* Check whether the feature is in the global set_features list. */
+	list_for_each_entry(val, &lisa_features_param.global_value, node)
+		if (lisa_features_param.ops->is_equal(&name, val))
+			return true;
+	return false;
+}
+
+int activate_lisa_cfg(struct lisa_cfg *cfg, bool value)
+{
+	struct feature *feature;
+	int ret;
+
+	if (cfg->activated == value)
+		return 0;
+
+	/* All the global values have now been updated. Time to enable them. */
+
+	ret = update_global_value(cfg, value);
+	if (ret)
+		return ret;
+
+	cfg->activated = value;
+
+	for_each_feature(feature) {
+		if (!is_feature_set(feature->name)) {
+			/*
+			 * Feature was enabled, and de-activating this config
+			 * disabled the feature.
+			 */
+			if (feature->__explicitly_enabled && !cfg->activated)
+				deinit_single_features(feature->name);
+			continue;
+		}
+
+		if (cfg->activated) {
+			/*
+			* Feature was enabled. By default, de-init before re-init the feature
+			* to catch potential modifications.
+			*/
+			if (feature->__explicitly_enabled)
+				deinit_single_features(feature->name);
+			init_single_feature(feature->name);
+			continue;
+		}
+	}
+
+	return 0;
+}

lisa/_assets/kmodules/lisa/configs.h

@@ -0,0 +1,30 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+
+#ifndef _CONFIGS_H
+#define _CONFIGS_H
+
+#include "main.h"
+
+struct lisa_cfg {
+	struct dentry *dentry;
+
+	/* Member of cfg_list. */
+	struct hlist_node node;
+
+	/* List of (struct feature_param_entry)->node_cfg. */
+	struct hlist_head list_param;
+
+	/* This config is currently activated. */
+	bool activated;
+	char *name;
+};
+
+struct lisa_cfg *allocate_lisa_cfg(const char *name);
+void init_lisa_cfg(struct lisa_cfg *cfg, struct hlist_head *cfg_list,
+		  struct dentry *dentry);
+void free_lisa_cfg(struct lisa_cfg *cfg);
+void drain_lisa_cfg(struct hlist_head *head);
+struct lisa_cfg *find_lisa_cfg(struct hlist_head *cfg_list, const char *name);
+int activate_lisa_cfg(struct lisa_cfg *cfg, bool value);
+
+#endif // _CONFIGS_H