linux-kernel - [PATCH v3 06/10] coresight: tmc: add create/delete functions for etr_buf

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Message-Id: <20250624060438.7469-7-jie.gan@oss.qualcomm.com>
Date: Tue, 24 Jun 2025 14:04:34 +0800
From: Jie Gan <jie.gan@....qualcomm.com>
To: Suzuki K Poulose <suzuki.poulose@....com>,
        Mike Leach <mike.leach@...aro.org>,
        James Clark <james.clark@...aro.org>, Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Cc: Tingwei Zhang <quic_tingweiz@...cinc.com>, coresight@...ts.linaro.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        jie.gan@....qualcomm.com
Subject: [PATCH v3 06/10] coresight: tmc: add create/delete functions for etr_buf_node

Create and insert or remove the etr_buf_node to/from the etr_buf_list.

Signed-off-by: Jie Gan <jie.gan@....qualcomm.com>
---
 .../hwtracing/coresight/coresight-tmc-etr.c   | 49 +++++++++++++++++++
 1 file changed, 49 insertions(+)

diff --git a/drivers/hwtracing/coresight/coresight-tmc-etr.c b/drivers/hwtracing/coresight/coresight-tmc-etr.c
index b07fcdb3fe1a..4609df80ae38 100644
--- a/drivers/hwtracing/coresight/coresight-tmc-etr.c
+++ b/drivers/hwtracing/coresight/coresight-tmc-etr.c
@@ -1909,6 +1909,55 @@ const struct coresight_ops tmc_etr_cs_ops = {
 	.panic_ops	= &tmc_etr_sync_ops,
 };
 
+static void tmc_delete_etr_buf_node(struct tmc_drvdata *drvdata)
+{
+	struct etr_buf_node *nd, *next;
+
+	list_for_each_entry_safe(nd, next, &drvdata->etr_buf_list, node) {
+		if (nd->sysfs_buf == drvdata->sysfs_buf) {
+			list_del(&nd->node);
+			kfree(nd);
+		} else {
+			/* Free allocated buffers which are not utilized by ETR */
+			list_del(&nd->node);
+			tmc_free_etr_buf(nd->sysfs_buf);
+			nd->sysfs_buf = NULL;
+			kfree(nd);
+		}
+	}
+}
+
+static int tmc_create_etr_buf_node(struct tmc_drvdata *drvdata, struct etr_buf *alloc_buf)
+{
+	struct etr_buf_node *sysfs_buf_node;
+	struct etr_buf *sysfs_buf;
+
+	if (!alloc_buf) {
+		sysfs_buf = tmc_alloc_etr_buf(drvdata, drvdata->size, 0, cpu_to_node(0), NULL);
+		if (IS_ERR(sysfs_buf))
+			return PTR_ERR(sysfs_buf);
+	} else {
+		sysfs_buf = alloc_buf;
+	}
+
+	sysfs_buf_node = kzalloc(sizeof(struct etr_buf_node), GFP_KERNEL);
+	if (IS_ERR(sysfs_buf_node)) {
+		if (!alloc_buf)
+			tmc_free_etr_buf(sysfs_buf);
+		return PTR_ERR(sysfs_buf_node);
+	}
+
+	sysfs_buf_node->sysfs_buf = sysfs_buf;
+	sysfs_buf_node->reading = false;
+	if (!alloc_buf)
+		sysfs_buf_node->is_free = true;
+	else
+		sysfs_buf_node->is_free = false;
+	list_add(&sysfs_buf_node->node, &drvdata->etr_buf_list);
+
+	return 0;
+}
+
 int tmc_read_prepare_etr(struct tmc_drvdata *drvdata)
 {
 	int ret = 0;
-- 
2.34.1