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Date: Thu, 28 Jan 2021 17:09:31 +0000
From: Mike Leach <mike.leach@...aro.org>
To: linux-arm-kernel@...ts.infradead.org, coresight@...ts.linaro.org,
mathieu.poirier@...aro.org, linux-doc@...r.kernel.org,
suzuki.poulose@....com
Cc: yabinc@...gle.com, corbet@....net, leo.yan@...aro.org,
alexander.shishkin@...ux.intel.com, tingwei@...eaurora.org,
gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org,
Mike Leach <mike.leach@...aro.org>
Subject: [PATCH v4 05/10] coresight: syscfg: Add API to activate and enable configurations
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@...aro.org>
---
.../hwtracing/coresight/coresight-config.h | 2 +
.../hwtracing/coresight/coresight-syscfg.c | 127 ++++++++++++++++++
.../hwtracing/coresight/coresight-syscfg.h | 10 +-
include/linux/coresight.h | 2 +
4 files changed, 140 insertions(+), 1 deletion(-)
diff --git a/drivers/hwtracing/coresight/coresight-config.h b/drivers/hwtracing/coresight/coresight-config.h
index 98380b496046..26396b70c826 100644
--- a/drivers/hwtracing/coresight/coresight-config.h
+++ b/drivers/hwtracing/coresight/coresight-config.h
@@ -156,6 +156,7 @@ struct cscfg_config_feat_ref {
* @presets: Array of preset values.
* @id_ea: Extended attribute for perf configid value
* @event_ea: Extended attribute for perf event value
+ * @active_cnt: ref count for activate on this configuration.
*/
struct cscfg_config_desc {
const char *name;
@@ -168,6 +169,7 @@ struct cscfg_config_desc {
const u64 *presets; /* nr_presets * nr_total_params */
struct dev_ext_attribute *id_ea;
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 a070f135eca3..d79cf5b36758 100644
--- a/drivers/hwtracing/coresight/coresight-syscfg.c
+++ b/drivers/hwtracing/coresight/coresight-syscfg.c
@@ -298,6 +298,7 @@ static int cscfg_load_config(struct cscfg_config_desc *cfg_desc)
return err;
list_add(&cfg_desc->item, &cscfg_mgr->data.config_desc_list);
+ atomic_set(&cfg_desc->active_cnt, 0);
return 0;
}
@@ -477,6 +478,131 @@ 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;
+
+ mutex_lock(&cscfg_csdev_mutex);
+ if (list_empty(&csdev->feature_csdev_list))
+ goto unlock_exit;
+
+ list_for_each_entry(feat, &csdev->feature_csdev_list, node)
+ cscfg_reset_feat(feat);
+
+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 *curr_item, *match_item = 0;
+
+ mutex_lock(&cscfg_mutex);
+
+ list_for_each_entry(curr_item, &cscfg_mgr->data.config_desc_list, item) {
+ if ((unsigned long)curr_item->id_ea->var == cfg_hash) {
+ match_item = curr_item;
+ atomic_inc(&cscfg_mgr->data.sys_active_cnt);
+ break;
+ }
+ }
+ mutex_unlock(&cscfg_mutex);
+
+ if (!match_item)
+ return -EINVAL;
+
+ dev_dbg(to_device_cscfg(), "Activate config %s.\n", match_item->name);
+
+ /* mark the descriptors as active so enable config will use them */
+ mutex_lock(&cscfg_csdev_mutex);
+ atomic_inc(&match_item->active_cnt);
+ mutex_unlock(&cscfg_csdev_mutex);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(cscfg_activate_config);
+
+void cscfg_deactivate_config(unsigned long cfg_hash)
+{
+ struct cscfg_config_desc *curr_item, *match_item = 0;
+
+ mutex_lock(&cscfg_mutex);
+
+ list_for_each_entry(curr_item, &cscfg_mgr->data.config_desc_list, item) {
+ if ((unsigned long)curr_item->id_ea->var == cfg_hash) {
+ match_item = curr_item;
+ break;
+ }
+ }
+ mutex_unlock(&cscfg_mutex);
+ if (!match_item)
+ return;
+
+ dev_dbg(to_device_cscfg(), "Deactivate config %s.\n", match_item->name);
+
+ mutex_lock(&cscfg_csdev_mutex);
+ atomic_dec(&match_item->active_cnt);
+ mutex_unlock(&cscfg_csdev_mutex);
+
+ atomic_dec(&cscfg_mgr->data.sys_active_cnt);
+}
+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 id_hash, int preset)
+{
+ struct cscfg_config_csdev *cfg = NULL, *item;
+ const struct cscfg_config_desc *desc;
+ int err = 0;
+
+ /* quickly check global count */
+ if (!atomic_read(&cscfg_mgr->data.sys_active_cnt))
+ return 0;
+
+ mutex_lock(&cscfg_csdev_mutex);
+ list_for_each_entry(item, &csdev->config_csdev_list, node) {
+ desc = item->desc;
+ if ((atomic_read(&desc->active_cnt)) &&
+ ((unsigned long)desc->id_ea->var == id_hash)) {
+ cfg = item;
+ break;
+ }
+ }
+ if (cfg) {
+ err = cscfg_csdev_enable_config(cfg, preset);
+ if (!err)
+ csdev->active_cfg_ctxt = (void *)cfg;
+ }
+ 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 *cfg;
+
+ mutex_lock(&cscfg_csdev_mutex);
+ cfg = (struct cscfg_config_csdev *)csdev->active_cfg_ctxt;
+ if (cfg)
+ cscfg_csdev_disable_config(cfg);
+ mutex_unlock(&cscfg_csdev_mutex);
+}
+EXPORT_SYMBOL_GPL(cscfg_csdev_disable_active_config);
+
/* Initialise system configuration management device. */
struct device *to_device_cscfg(void)
@@ -546,6 +672,7 @@ int __init cscfg_init(void)
INIT_LIST_HEAD(&cscfg_mgr->data.feat_desc_list);
INIT_LIST_HEAD(&cscfg_mgr->data.config_desc_list);
cscfg_mgr->data.nr_csdev = 0;
+ atomic_set(&cscfg_mgr->data.sys_active_cnt, 0);
dev_info(to_device_cscfg(), "CoreSight Configuration manager initialised");
return 0;
diff --git a/drivers/hwtracing/coresight/coresight-syscfg.h b/drivers/hwtracing/coresight/coresight-syscfg.h
index ebf5e1491d86..301e26e1e98f 100644
--- a/drivers/hwtracing/coresight/coresight-syscfg.h
+++ b/drivers/hwtracing/coresight/coresight-syscfg.h
@@ -17,13 +17,15 @@
* @csdev_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.
- * @nr_csdev: Number of registered devices with the cscfg system
+ * @nr_csdev: Number of registered devices with the cscfg system
+ * @sys_active_cnt: Total number of active config descriptor references.
*/
struct cscfg_api_data {
struct list_head csdev_desc_list;
struct list_head feat_desc_list;
struct list_head config_desc_list;
int nr_csdev;
+ atomic_t sys_active_cnt;
};
/**
@@ -53,6 +55,12 @@ int cscfg_register_csdev(struct coresight_device *csdev,
struct cscfg_match_desc *info,
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 id_hash, int preset);
+void cscfg_csdev_disable_active_config(struct coresight_device *csdev);
/**
* System configuration manager device.
diff --git a/include/linux/coresight.h b/include/linux/coresight.h
index d0126ed326a6..3941854e8280 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_cfg_ctxt: Context information for current active congfig.
*/
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_cfg_ctxt;
};
/*
--
2.17.1
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