linux-kernel - [PATCH] coresight: core: Add coresight name support

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Date:   Wed, 8 Feb 2023 03:07:16 -0800
From:   Mao Jinlong <quic_jinlmao@...cinc.com>
To:     Mathieu Poirier <mathieu.poirier@...aro.org>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Mike Leach <mike.leach@...aro.org>,
        Leo Yan <leo.yan@...aro.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>
CC:     Mao Jinlong <quic_jinlmao@...cinc.com>,
        <coresight@...ts.linaro.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <linux-arm-msm@...r.kernel.org>,
        Tingwei Zhang <quic_tingweiz@...cinc.com>,
        Yuanfang Zhang <quic_yuanfang@...cinc.com>,
        Tao Zhang <quic_taozha@...cinc.com>,
        Hao Zhang <quic_hazha@...cinc.com>
Subject: [PATCH] coresight: core: Add coresight name support

Apart from STM and ETM sources, there will be more sources added to
coresight components. For example, there are over 10 TPDM sources.
Add coresight name support for custom names which will be
easy to identify the source.

Signed-off-by: Mao Jinlong <quic_jinlmao@...cinc.com>
---
 drivers/hwtracing/coresight/coresight-core.c | 34 +++++++++++---------
 1 file changed, 19 insertions(+), 15 deletions(-)

diff --git a/drivers/hwtracing/coresight/coresight-core.c b/drivers/hwtracing/coresight/coresight-core.c
index d3bf82c0de1d..5e95d9c7f256 100644
--- a/drivers/hwtracing/coresight/coresight-core.c
+++ b/drivers/hwtracing/coresight/coresight-core.c
@@ -1733,28 +1733,32 @@ char *coresight_alloc_device_name(struct coresight_dev_list *dict,
 {
 	int idx;
 	char *name = NULL;
+	const char *coresight_name = NULL;
 	struct fwnode_handle **list;
+	struct device_node *node = dev->of_node;
 
 	mutex_lock(&coresight_mutex);
 
-	idx = coresight_search_device_idx(dict, dev_fwnode(dev));
-	if (idx < 0) {
-		/* Make space for the new entry */
-		idx = dict->nr_idx;
-		list = krealloc_array(dict->fwnode_list,
-				      idx + 1, sizeof(*dict->fwnode_list),
-				      GFP_KERNEL);
-		if (ZERO_OR_NULL_PTR(list)) {
-			idx = -ENOMEM;
-			goto done;
+	if (!of_property_read_string(node, "coresight-name", &coresight_name))
+		name = devm_kasprintf(dev, GFP_KERNEL, "%s", coresight_name);
+	else {
+		idx = coresight_search_device_idx(dict, dev_fwnode(dev));
+		if (idx < 0) {
+			/* Make space for the new entry */
+			idx = dict->nr_idx;
+			list = krealloc_array(dict->fwnode_list,
+					      idx + 1, sizeof(*dict->fwnode_list),
+					      GFP_KERNEL);
+			if (ZERO_OR_NULL_PTR(list))
+				goto done;
+
+			list[idx] = dev_fwnode(dev);
+			dict->fwnode_list = list;
+			dict->nr_idx = idx + 1;
 		}
 
-		list[idx] = dev_fwnode(dev);
-		dict->fwnode_list = list;
-		dict->nr_idx = idx + 1;
+		name = devm_kasprintf(dev, GFP_KERNEL, "%s%d", dict->pfx, idx);
 	}
-
-	name = devm_kasprintf(dev, GFP_KERNEL, "%s%d", dict->pfx, idx);
 done:
 	mutex_unlock(&coresight_mutex);
 	return name;
-- 
2.39.0