1 files changed, 337 insertions, 1 deletions

diff --git a/drivers/hwtracing/coresight/coresight-syscfg.c b/drivers/hwtracing/coresight/coresight-syscfg.c
index 417db3f92c2f..2c0d4906e226 100644
--- a/drivers/hwtracing/coresight/coresight-syscfg.c
+++ b/drivers/hwtracing/coresight/coresight-syscfg.c
@@ -25,6 +25,198 @@ static struct cscfg_manager *cscfg_mgr;
 
 /* load features and configuations into the lists */
 
+/* get name feature instance from a coresight device list of features */
+static struct cscfg_feature_csdev *
+cscfg_get_feat_csdev(struct coresight_device *csdev, const char *name)
+{
+	struct cscfg_feature_csdev *feat_csdev = NULL;
+
+	list_for_each_entry(feat_csdev, &csdev->feature_csdev_list, node) {
+		if (strcmp(feat_csdev->feat_desc->name, name) == 0)
+			return feat_csdev;
+	}
+	return NULL;
+}
+
+/* allocate the device config instance - with max number of used features */
+static struct cscfg_config_csdev *
+cscfg_alloc_csdev_cfg(struct coresight_device *csdev, int nr_feats)
+{
+	struct cscfg_config_csdev *config_csdev = NULL;
+	struct device *dev = csdev->dev.parent;
+
+	/* this is being allocated using the devm for the coresight device */
+	config_csdev = devm_kzalloc(dev,
+				    offsetof(struct cscfg_config_csdev, feats_csdev[nr_feats]),
+				    GFP_KERNEL);
+	if (!config_csdev)
+		return NULL;
+
+	config_csdev->csdev = csdev;
+	return config_csdev;
+}
+
+/* Load a config into a device if there are any feature matches between config and device */
+static int cscfg_add_csdev_cfg(struct coresight_device *csdev,
+			       struct cscfg_config_desc *config_desc)
+{
+	struct cscfg_config_csdev *config_csdev = NULL;
+	struct cscfg_feature_csdev *feat_csdev;
+	unsigned long flags;
+	int i;
+
+	/* look at each required feature and see if it matches any feature on the device */
+	for (i = 0; i < config_desc->nr_feat_refs; i++) {
+		/* look for a matching name */
+		feat_csdev = cscfg_get_feat_csdev(csdev, config_desc->feat_ref_names[i]);
+		if (feat_csdev) {
+			/*
+			 * At least one feature on this device matches the config
+			 * add a config instance to the device and a reference to the feature.
+			 */
+			if (!config_csdev) {
+				config_csdev = cscfg_alloc_csdev_cfg(csdev,
+								     config_desc->nr_feat_refs);
+				if (!config_csdev)
+					return -ENOMEM;
+				config_csdev->config_desc = config_desc;
+			}
+			config_csdev->feats_csdev[config_csdev->nr_feat++] = feat_csdev;
+		}
+	}
+	/* if matched features, add config to device.*/
+	if (config_csdev) {
+		spin_lock_irqsave(&csdev->cscfg_csdev_lock, flags);
+		list_add(&config_csdev->node, &csdev->config_csdev_list);
+		spin_unlock_irqrestore(&csdev->cscfg_csdev_lock, flags);
+	}
+
+	return 0;
+}
+
+/*
+ * Add the config to the set of registered devices - call with mutex locked.
+ * Iterates through devices - any device that matches one or more of the
+ * configuration features will load it, the others will ignore it.
+ */
+static int cscfg_add_cfg_to_csdevs(struct cscfg_config_desc *config_desc)
+{
+	struct cscfg_registered_csdev *csdev_item;
+	int err;
+
+	list_for_each_entry(csdev_item, &cscfg_mgr->csdev_desc_list, item) {
+		err = cscfg_add_csdev_cfg(csdev_item->csdev, config_desc);
+		if (err)
+			return err;
+	}
+	return 0;
+}
+
+/*
+ * Allocate a feature object for load into a csdev.
+ * memory allocated using the csdev->dev object using devm managed allocator.
+ */
+static struct cscfg_feature_csdev *
+cscfg_alloc_csdev_feat(struct coresight_device *csdev, struct cscfg_feature_desc *feat_desc)
+{
+	struct cscfg_feature_csdev *feat_csdev = NULL;
+	struct device *dev = csdev->dev.parent;
+	int i;
+
+	feat_csdev = devm_kzalloc(dev, sizeof(struct cscfg_feature_csdev), GFP_KERNEL);
+	if (!feat_csdev)
+		return NULL;
+
+	/* parameters are optional - could be 0 */
+	feat_csdev->nr_params = feat_desc->nr_params;
+
+	/*
+	 * if we need parameters, zero alloc the space here, the load routine in
+	 * the csdev device driver will fill out some information according to
+	 * feature descriptor.
+	 */
+	if (feat_csdev->nr_params) {
+		feat_csdev->params_csdev = devm_kcalloc(dev, feat_csdev->nr_params,
+							sizeof(struct cscfg_parameter_csdev),
+							GFP_KERNEL);
+		if (!feat_csdev->params_csdev)
+			return NULL;
+
+		/*
+		 * fill in the feature reference in the param - other fields
+		 * handled by loader in csdev.
+		 */
+		for (i = 0; i < feat_csdev->nr_params; i++)
+			feat_csdev->params_csdev[i].feat_csdev = feat_csdev;
+	}
+
+	/*
+	 * Always have registers to program - again the load routine in csdev device
+	 * will fill out according to feature descriptor and device requirements.
+	 */
+	feat_csdev->nr_regs = feat_desc->nr_regs;
+	feat_csdev->regs_csdev = devm_kcalloc(dev, feat_csdev->nr_regs,
+					      sizeof(struct cscfg_regval_csdev),
+					      GFP_KERNEL);
+	if (!feat_csdev->regs_csdev)
+		return NULL;
+
+	/* load the feature default values */
+	feat_csdev->feat_desc = feat_desc;
+	feat_csdev->csdev = csdev;
+
+	return feat_csdev;
+}
+
+/* load one feature into one coresight device */
+static int cscfg_load_feat_csdev(struct coresight_device *csdev,
+				 struct cscfg_feature_desc *feat_desc,
+				 struct cscfg_csdev_feat_ops *ops)
+{
+	struct cscfg_feature_csdev *feat_csdev;
+	unsigned long flags;
+	int err;
+
+	if (!ops->load_feat)
+		return -EINVAL;
+
+	feat_csdev = cscfg_alloc_csdev_feat(csdev, feat_desc);
+	if (!feat_csdev)
+		return -ENOMEM;
+
+	/* load the feature into the device */
+	err = ops->load_feat(csdev, feat_csdev);
+	if (err)
+		return err;
+
+	/* add to internal csdev feature list */
+	spin_lock_irqsave(&csdev->cscfg_csdev_lock, flags);
+	list_add(&feat_csdev->node, &csdev->feature_csdev_list);
+	spin_unlock_irqrestore(&csdev->cscfg_csdev_lock, flags);
+
+	return 0;
+}
+
+/*
+ * Add feature to any matching devices - call with mutex locked.
+ * Iterates through devices - any device that matches the feature will be
+ * called to load it.
+ */
+static int cscfg_add_feat_to_csdevs(struct cscfg_feature_desc *feat_desc)
+{
+	struct cscfg_registered_csdev *csdev_item;
+	int err;
+
+	list_for_each_entry(csdev_item, &cscfg_mgr->csdev_desc_list, item) {
+		if (csdev_item->match_flags & feat_desc->match_flags) {
+			err = cscfg_load_feat_csdev(csdev_item->csdev, feat_desc, &csdev_item->ops);
+			if (err)
+				return err;
+		}
+	}
+	return 0;
+}
+
 /* check feature list for a named feature - call with mutex locked. */
 static bool cscfg_match_list_feat(const char *name)
 {
@@ -53,8 +245,14 @@ static int cscfg_check_feat_for_cfg(struct cscfg_config_desc *config_desc)
  */
 static int cscfg_load_feat(struct cscfg_feature_desc *feat_desc)
 {
-	list_add(&feat_desc->item, &cscfg_mgr->feat_desc_list);
+	int err;
+
+	/* add feature to any matching registered devices */
+	err = cscfg_add_feat_to_csdevs(feat_desc);
+	if (err)
+		return err;
 
+	list_add(&feat_desc->item, &cscfg_mgr->feat_desc_list);
 	return 0;
 }
 
@@ -71,6 +269,11 @@ static int cscfg_load_config(struct cscfg_config_desc *config_desc)
 	if (err)
 		return err;
 
+	/* add config to any matching registered device */
+	err = cscfg_add_cfg_to_csdevs(config_desc);
+	if (err)
+		return err;
+
 	list_add(&config_desc->item, &cscfg_mgr->config_desc_list);
 	return 0;
 }
@@ -125,6 +328,139 @@ exit_unlock:
 }
 EXPORT_SYMBOL_GPL(cscfg_load_config_sets);
 
+/* Handle coresight device registration and add configs and features to devices */
+
+/* iterate through config lists and load matching configs to device */
+static int cscfg_add_cfgs_csdev(struct coresight_device *csdev)
+{
+	struct cscfg_config_desc *config_desc;
+	int err = 0;
+
+	list_for_each_entry(config_desc, &cscfg_mgr->config_desc_list, item) {
+		err = cscfg_add_csdev_cfg(csdev, config_desc);
+		if (err)
+			break;
+	}
+	return err;
+}
+
+/* iterate through feature lists and load matching features to device */
+static int cscfg_add_feats_csdev(struct coresight_device *csdev,
+				 u32 match_flags,
+				 struct cscfg_csdev_feat_ops *ops)
+{
+	struct cscfg_feature_desc *feat_desc;
+	int err = 0;
+
+	if (!ops->load_feat)
+		return -EINVAL;
+
+	list_for_each_entry(feat_desc, &cscfg_mgr->feat_desc_list, item) {
+		if (feat_desc->match_flags & match_flags) {
+			err = cscfg_load_feat_csdev(csdev, feat_desc, ops);
+			if (err)
+				break;
+		}
+	}
+	return err;
+}
+
+/* Add coresight device to list and copy its matching info */
+static int cscfg_list_add_csdev(struct coresight_device *csdev,
+				u32 match_flags,
+				struct cscfg_csdev_feat_ops *ops)
+{
+	struct cscfg_registered_csdev *csdev_item;
+
+	/* allocate the list entry structure */
+	csdev_item = kzalloc(sizeof(struct cscfg_registered_csdev), GFP_KERNEL);
+	if (!csdev_item)
+		return -ENOMEM;
+
+	csdev_item->csdev = csdev;
+	csdev_item->match_flags = match_flags;
+	csdev_item->ops.load_feat = ops->load_feat;
+	list_add(&csdev_item->item, &cscfg_mgr->csdev_desc_list);
+
+	INIT_LIST_HEAD(&csdev->feature_csdev_list);
+	INIT_LIST_HEAD(&csdev->config_csdev_list);
+	spin_lock_init(&csdev->cscfg_csdev_lock);
+
+	return 0;
+}
+
+/* remove a coresight device from the list and free data */
+static void cscfg_list_remove_csdev(struct coresight_device *csdev)
+{
+	struct cscfg_registered_csdev *csdev_item, *tmp;
+
+	list_for_each_entry_safe(csdev_item, tmp, &cscfg_mgr->csdev_desc_list, item) {
+		if (csdev_item->csdev == csdev) {
+			list_del(&csdev_item->item);
+			kfree(csdev_item);
+			break;
+		}
+	}
+}
+
+/**
+ * cscfg_register_csdev - register a coresight device with the syscfg manager.
+ *
+ * Registers the coresight device with the system. @match_flags used to check
+ * if the device is a match for registered features. Any currently registered
+ * configurations and features that match the device will be loaded onto it.
+ *
+ * @csdev:		The coresight device to register.
+ * @match_flags:	Matching information to load features.
+ * @ops:		Standard operations supported by the device.
+ */
+int cscfg_register_csdev(struct coresight_device *csdev,
+			 u32 match_flags,
+			 struct cscfg_csdev_feat_ops *ops)
+{
+	int ret = 0;
+
+	mutex_lock(&cscfg_mutex);
+
+	/* add device to list of registered devices  */
+	ret = cscfg_list_add_csdev(csdev, match_flags, ops);
+	if (ret)
+		goto reg_csdev_unlock;
+
+	/* now load any registered features and configs matching the device. */
+	ret = cscfg_add_feats_csdev(csdev, match_flags, ops);
+	if (ret) {
+		cscfg_list_remove_csdev(csdev);
+		goto reg_csdev_unlock;
+	}
+
+	ret = cscfg_add_cfgs_csdev(csdev);
+	if (ret) {
+		cscfg_list_remove_csdev(csdev);
+		goto reg_csdev_unlock;
+	}
+
+	pr_info("CSCFG registered %s", dev_name(&csdev->dev));
+
+reg_csdev_unlock:
+	mutex_unlock(&cscfg_mutex);
+	return ret;
+}
+EXPORT_SYMBOL_GPL(cscfg_register_csdev);
+
+/**
+ * cscfg_unregister_csdev - remove coresight device from syscfg manager.
+ *
+ * @csdev: Device to remove.
+ */
+void cscfg_unregister_csdev(struct coresight_device *csdev)
+{
+	mutex_lock(&cscfg_mutex);
+	cscfg_list_remove_csdev(csdev);
+	mutex_unlock(&cscfg_mutex);
+}
+EXPORT_SYMBOL_GPL(cscfg_unregister_csdev);
+
 /* Initialise system configuration management device. */
 
 struct device *cscfg_device(void)