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From:   Mike Leach <mike.leach@linaro.org>
To:     linux-arm-kernel@lists.infradead.org, coresight@lists.linaro.org,
        mathieu.poirier@linaro.org, linux-doc@vger.kernel.org,
        suzuki.poulose@arm.com
Cc:     yabinc@google.com, corbet@lwn.net, leo.yan@linaro.org,
        alexander.shishkin@linux.intel.com, tingwei@codeaurora.org,
        gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org,
        Mike Leach <mike.leach@linaro.org>
Subject: [PATCH v5 05/10] coresight: syscfg: Add API to activate and enable configurations
Date:   Tue, 16 Mar 2021 18:03:55 +0000
Message-Id: <20210316180400.7184-6-mike.leach@linaro.org>
In-Reply-To: <20210316180400.7184-1-mike.leach@linaro.org>
References: <20210316180400.7184-1-mike.leach@linaro.org>
Precedence: bulk

Configurations are first activated, then when any coresight device is
enabled, the active configurations are checked and any matching
one is enabled.

This patch provides the activation / enable API.

Signed-off-by: Mike Leach <mike.leach@linaro.org>
---
 .../hwtracing/coresight/coresight-config.h    |   2 +
 .../hwtracing/coresight/coresight-syscfg.c    | 122 ++++++++++++++++++
 .../hwtracing/coresight/coresight-syscfg.h    |   8 ++
 include/linux/coresight.h                     |   2 +
 4 files changed, 134 insertions(+)

diff --git a/drivers/hwtracing/coresight/coresight-config.h b/drivers/hwtracing/coresight/coresight-config.h
index 38fd1c71eb05..f1a5957a25c9 100644
--- a/drivers/hwtracing/coresight/coresight-config.h
+++ b/drivers/hwtracing/coresight/coresight-config.h
@@ -127,6 +127,7 @@ struct cscfg_feature_desc {
  * @nr_total_params:	Sum of all parameters declared by used features
  * @presets:		Array of preset values.
  * @event_ea:		Extended attribute for perf event value
+ * @active_cnt:		ref count for activate on this configuration.
  *
  */
 struct cscfg_config_desc {
@@ -139,6 +140,7 @@ struct cscfg_config_desc {
 	int nr_total_params;
 	const u64 *presets; /* nr_presets * nr_total_params */
 	struct dev_ext_attribute *event_ea;
+	atomic_t active_cnt;
 };
 
 /**
diff --git a/drivers/hwtracing/coresight/coresight-syscfg.c b/drivers/hwtracing/coresight/coresight-syscfg.c
index 03014a2142c1..c44746d6cd6d 100644
--- a/drivers/hwtracing/coresight/coresight-syscfg.c
+++ b/drivers/hwtracing/coresight/coresight-syscfg.c
@@ -284,6 +284,7 @@ static int cscfg_load_config(struct cscfg_config_desc *config_desc)
 		return err;
 
 	list_add(&config_desc->item, &cscfg_mgr->config_desc_list);
+	atomic_set(&config_desc->active_cnt, 0);
 	return 0;
 }
 
@@ -451,6 +452,126 @@ void cscfg_unregister_csdev(struct coresight_device *csdev)
 }
 EXPORT_SYMBOL_GPL(cscfg_unregister_csdev);
 
+void cscfg_csdev_reset_feats(struct coresight_device *csdev)
+{
+	struct cscfg_feature_csdev *feat_csdev;
+
+	mutex_lock(&cscfg_csdev_mutex);
+	if (list_empty(&csdev->feature_csdev_list))
+		goto unlock_exit;
+
+	list_for_each_entry(feat_csdev, &csdev->feature_csdev_list, node)
+		cscfg_reset_feat(feat_csdev);
+
+unlock_exit:
+	mutex_unlock(&cscfg_csdev_mutex);
+}
+EXPORT_SYMBOL_GPL(cscfg_csdev_reset_feats);
+
+/**
+ * Mark a config descriptor as active.
+ * This will be seen when csdev devices are activated in the system.
+ *
+ * Selection by hash value - generated from the configuration name when it
+ * was loaded and added to the cs_etm/configurations file system for selection
+ * by perf.
+ *
+ * @cfg_hash: Hash value of the selected configuration name.
+ */
+int cscfg_activate_config(unsigned long cfg_hash)
+{
+	struct cscfg_config_desc *config_desc;
+	int err = -EINVAL;
+
+	mutex_lock(&cscfg_mutex);
+
+	list_for_each_entry(config_desc, &cscfg_mgr->config_desc_list, item) {
+		if ((unsigned long)config_desc->event_ea->var == cfg_hash) {
+			/*
+			 * increment the global active count - control changes to
+			 * active configurations
+			 */
+			atomic_inc(&cscfg_mgr->sys_active_cnt);
+
+			/*
+			 * mark the descriptor as active so enable config on a
+			 * device instance will use it
+			 */
+			atomic_inc(&config_desc->active_cnt);
+
+			err = 0;
+			dev_dbg(cscfg_device(), "Activate config %s.\n", config_desc->name);
+			break;
+		}
+	}
+	mutex_unlock(&cscfg_mutex);
+
+	return err;
+}
+EXPORT_SYMBOL_GPL(cscfg_activate_config);
+
+void cscfg_deactivate_config(unsigned long cfg_hash)
+{
+	struct cscfg_config_desc *config_desc;
+
+	mutex_lock(&cscfg_mutex);
+
+	list_for_each_entry(config_desc, &cscfg_mgr->config_desc_list, item) {
+		if ((unsigned long)config_desc->event_ea->var == cfg_hash) {
+			atomic_dec(&config_desc->active_cnt);
+			atomic_dec(&cscfg_mgr->sys_active_cnt);
+			dev_dbg(cscfg_device(), "Deactivate config %s.\n", config_desc->name);
+			break;
+		}
+	}
+	mutex_unlock(&cscfg_mutex);
+}
+EXPORT_SYMBOL_GPL(cscfg_deactivate_config);
+
+/* Find and program any active config for the supplied device.*/
+int cscfg_csdev_enable_active_config(struct coresight_device *csdev,
+				     unsigned long cfg_hash, int preset)
+{
+	struct cscfg_config_csdev *config_csdev_active = NULL, *config_csdev_item;
+	const struct cscfg_config_desc *config_desc;
+	int err = 0;
+
+	/* quickly check global count */
+	if (!atomic_read(&cscfg_mgr->sys_active_cnt))
+		return 0;
+
+	mutex_lock(&cscfg_csdev_mutex);
+	list_for_each_entry(config_csdev_item, &csdev->config_csdev_list, node) {
+		config_desc = config_csdev_item->config_desc;
+		if ((atomic_read(&config_desc->active_cnt)) &&
+		    ((unsigned long)config_desc->event_ea->var == cfg_hash)) {
+			config_csdev_active = config_csdev_item;
+			break;
+		}
+	}
+	if (config_csdev_active) {
+		err = cscfg_csdev_enable_config(config_csdev_active, preset);
+		if (!err)
+			csdev->active_cscfg_ctxt = (void *)config_csdev_active;
+	}
+	mutex_unlock(&cscfg_csdev_mutex);
+	return err;
+}
+EXPORT_SYMBOL_GPL(cscfg_csdev_enable_active_config);
+
+/* save and disable the active config for the device */
+void cscfg_csdev_disable_active_config(struct coresight_device *csdev)
+{
+	struct cscfg_config_csdev *config_csdev;
+
+	mutex_lock(&cscfg_csdev_mutex);
+	config_csdev = (struct cscfg_config_csdev *)csdev->active_cscfg_ctxt;
+	if (config_csdev)
+		cscfg_csdev_disable_config(config_csdev);
+	mutex_unlock(&cscfg_csdev_mutex);
+}
+EXPORT_SYMBOL_GPL(cscfg_csdev_disable_active_config);
+
 /* Initialise system configuration management device. */
 
 struct device *cscfg_device(void)
@@ -519,6 +640,7 @@ int __init cscfg_init(void)
 	INIT_LIST_HEAD(&cscfg_mgr->csdev_desc_list);
 	INIT_LIST_HEAD(&cscfg_mgr->feat_desc_list);
 	INIT_LIST_HEAD(&cscfg_mgr->config_desc_list);
+	atomic_set(&cscfg_mgr->sys_active_cnt, 0);
 
 	dev_info(cscfg_device(), "CoreSight Configuration manager initialised");
 	return 0;
diff --git a/drivers/hwtracing/coresight/coresight-syscfg.h b/drivers/hwtracing/coresight/coresight-syscfg.h
index 5bcae3b374c6..a52775890670 100644
--- a/drivers/hwtracing/coresight/coresight-syscfg.h
+++ b/drivers/hwtracing/coresight/coresight-syscfg.h
@@ -24,12 +24,14 @@
  * @csdev_desc_list:	List of coresight devices registered with the configuration manager.
  * @feat_desc_list:	List of feature descriptors to load into registered devices.
  * @config_desc_list:	List of system configuration descriptors to load into registered devices.
+ * @sys_active_cnt:	Total number of active config descriptor references.
  */
 struct cscfg_manager {
 	struct device dev;
 	struct list_head csdev_desc_list;
 	struct list_head feat_desc_list;
 	struct list_head config_desc_list;
+	atomic_t sys_active_cnt;
 };
 
 /* get reference to dev in cscfg_manager */
@@ -61,5 +63,11 @@ int cscfg_load_config_sets(struct cscfg_config_desc **cfg_descs,
 int cscfg_register_csdev(struct coresight_device *csdev, u32 match_flags,
 			 struct cscfg_csdev_feat_ops *ops);
 void cscfg_unregister_csdev(struct coresight_device *csdev);
+int cscfg_activate_config(unsigned long cfg_hash);
+void cscfg_deactivate_config(unsigned long cfg_hash);
+void cscfg_csdev_reset_feats(struct coresight_device *csdev);
+int cscfg_csdev_enable_active_config(struct coresight_device *csdev,
+				     unsigned long cfg_hash, int preset);
+void cscfg_csdev_disable_active_config(struct coresight_device *csdev);
 
 #endif /* CORESIGHT_SYSCFG_H */
diff --git a/include/linux/coresight.h b/include/linux/coresight.h
index d0126ed326a6..a3b39ce2d6ef 100644
--- a/include/linux/coresight.h
+++ b/include/linux/coresight.h
@@ -221,6 +221,7 @@ struct coresight_sysfs_link {
  * @has_conns_grp: Have added a "connections" group for sysfs links.
  * @feature_csdev_list: List of complex feature programming added to the device.
  * @config_csdev_list:  List of system configurations added to the device.
+ * @active_cscfg_ctxt:  Context information for current active system configuration.
  */
 struct coresight_device {
 	struct coresight_platform_data *pdata;
@@ -245,6 +246,7 @@ struct coresight_device {
 	/* system configuration and feature lists */
 	struct list_head feature_csdev_list;
 	struct list_head config_csdev_list;
+	void *active_cscfg_ctxt;
 };
 
 /*
-- 
2.17.1