Message-ID: <57571da1-47fe-42dd-b08c-a0a6d10501cd@oss.qualcomm.com>
Date: Wed, 31 Dec 2025 12:02:18 +0530
From: Gaurav Kohli <gaurav.kohli@....qualcomm.com>
To: Krzysztof Kozlowski <krzk@...nel.org>, andersson@...nel.org,
        mathieu.poirier@...aro.org, robh@...nel.org, krzk+dt@...nel.org,
        conor+dt@...nel.org, rafael@...nel.org, daniel.lezcano@...aro.org,
        rui.zhang@...el.com, lukasz.luba@....com, konradybcio@...nel.org,
        amitk@...nel.org, mani@...nel.org, casey.connolly@...aro.org
Cc: linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org
Subject: Re: [PATCH v1 4/8] thermal: qcom: add qmi-cooling driver


On 12/24/2025 2:31 PM, Krzysztof Kozlowski wrote:
> On 23/12/2025 13:32, Gaurav Kohli wrote:
>> +static int thermal_qmi_new_server(struct qmi_handle *qmi, struct qmi_service *service)
>> +{
>> +	struct qmi_tmd_client *client = container_of(qmi, struct qmi_tmd_client, handle);
>> +	struct sockaddr_qrtr sq = { AF_QIPCRTR, service->node, service->port };
>> +
>> +	scoped_guard(mutex, &client->mutex)
>> +		kernel_connect(qmi->sock, (struct sockaddr_unsized *)&sq, sizeof(sq), 0);
>> +
>> +	queue_work(system_highpri_wq, &client->svc_arrive_work);
>> +
>> +	return 0;
>> +}
>> +
>> +static struct qmi_ops thermal_qmi_event_ops = {
> Why this is not const?


Will fix this.


>
>  From where did you copy this code?


We are using Casey's patches also in current series.

https://lore.kernel.org/linux-devicetree/20250822042316.1762153-1-quic_gkohli@quicinc.com/

Will fix all the suggested comments.


>
>> +	.new_server = thermal_qmi_new_server,
>> +	.del_server = thermal_qmi_del_server,
>> +	.net_reset = thermal_qmi_net_reset,
>> +};
>> +
>> +static void qmi_tmd_cleanup(struct qmi_tmd_client *client)
>> +{
>> +	struct qmi_tmd *tmd, *c_next;
>> +
>> +	guard(mutex)(&client->mutex);
>> +
>> +	client->connection_active = false;
>> +
>> +	qmi_handle_release(&client->handle);
>> +	cancel_work(&client->svc_arrive_work);
>> +	list_for_each_entry_safe(tmd, c_next, &client->cdev_list, node) {
>> +		if (tmd->rproc_cdev)
>> +			remoteproc_cooling_unregister(tmd->rproc_cdev);
>> +
>> +		list_del(&tmd->node);
>> +	}
>> +}
>> +
>> +/* Parse the controls and allocate a qmi_tmd for each of them */
>> +static int qmi_tmd_alloc_cdevs(struct qmi_tmd_client *client)
>> +{
>> +	struct device *dev = client->dev;
>> +	struct qmi_tmd *tmd;
>> +	struct device_node *subnode, *node = dev->of_node;
>> +	int ret;
>> +
>> +	for_each_available_child_of_node(node, subnode) {
>> +		const char *name;
>> +
>> +		tmd = devm_kzalloc(dev, sizeof(*tmd), GFP_KERNEL);
>> +		if (!tmd)
>> +			return dev_err_probe(client->dev, -ENOMEM,
>> +					     "Couldn't allocate tmd\n");
> You leak nodes.
>
>> +
>> +		tmd->type = devm_kasprintf(client->dev, GFP_KERNEL, "%s:%s",
>> +						client->name, subnode->name);
>> +		if (!tmd->type)
>> +			return dev_err_probe(dev, -ENOMEM,
>> +					     "Couldn't allocate cooling device name\n");
> Everywhere...
>
>> +
>> +		if (of_property_read_string(subnode, "label", &name)) {
>> +			return dev_err_probe(client->dev, -EINVAL,
>> +					     "Failed to parse dev name for %s\n",
>> +					     subnode->name);
>> +		}
>> +
>> +		ret = strscpy(tmd->qmi_name, name,
>> +			      QMI_TMD_MITIGATION_DEV_ID_LENGTH_MAX_V01 + 1);
>> +		if (ret == -E2BIG) {
>> +			return dev_err_probe(dev, -EINVAL, "TMD label %s is too long\n",
>> +					     name);
>> +		}
>> +
>> +		tmd->client = client;
>> +		tmd->np = subnode;
>> +		tmd->cur_state = 0;
>> +		list_add(&tmd->node, &client->cdev_list);
>> +	}
>> +
>> +	if (list_empty(&client->cdev_list))
>> +		return dev_err_probe(client->dev, -EINVAL,
>> +				     "No cooling devices specified for client %s (%#x)\n",
>> +				     client->name, client->id);
>> +
>> +	return 0;
>> +}
>> +
>> +static int qmi_tmd_client_probe(struct platform_device *pdev)
>> +{
>> +	struct device *dev = &pdev->dev;
>> +	struct qmi_tmd_client *client;
>> +	const struct qmi_instance_data *match;
>> +	int ret;
> Open any existing Linux driver. How does this part look like?
>
>> +	client = devm_kzalloc(dev, sizeof(*client), GFP_KERNEL);
>> +	if (!client)
>> +		return -ENOMEM;
>> +
>> +	client->dev = dev;
>> +
>> +	match = of_device_get_match_data(dev);
>> +	if (!match)
>> +		return dev_err_probe(dev, -EINVAL, "No match data\n");
>> +
>> +	client->id = match->id;
>> +	client->name = match->name;
>> +
>> +	mutex_init(&client->mutex);
>> +	INIT_LIST_HEAD(&client->cdev_list);
>> +	INIT_WORK(&client->svc_arrive_work, qmi_tmd_svc_arrive);
>> +
>> +	ret = qmi_tmd_alloc_cdevs(client);
>> +	if (ret)
>> +		return ret;
>> +
>> +	platform_set_drvdata(pdev, client);
>> +
>> +	ret = qmi_handle_init(&client->handle,
>> +			      TMD_GET_MITIGATION_DEVICE_LIST_RESP_MSG_V01_MAX_MSG_LEN,
>> +			      &thermal_qmi_event_ops, NULL);
>> +	if (ret < 0)
>> +		return dev_err_probe(client->dev, ret, "QMI handle init failed for client %#x\n",
>> +			      client->id);
>> +
>> +	ret = qmi_add_lookup(&client->handle, TMD_SERVICE_ID_V01, TMD_SERVICE_VERS_V01,
>> +			     client->id);
>> +	if (ret < 0) {
>> +		qmi_handle_release(&client->handle);
>> +		return dev_err_probe(client->dev, ret, "QMI register failed for client 0x%x\n",
>> +			      client->id);
>> +	}
>> +
>> +	return 0;
>> +}
>> +
>> +static void qmi_tmd_client_remove(struct platform_device *pdev)
>> +{
>> +	struct qmi_tmd_client *client = platform_get_drvdata(pdev);
>> +
>> +	qmi_tmd_cleanup(client);
>> +}
>> +
>> +static const struct of_device_id qmi_tmd_device_table[] = {
>> +	{
>> +		.compatible = "qcom,qmi-cooling-cdsp",
>> +		.data = &((struct qmi_instance_data) { CDSP_INSTANCE_ID, "cdsp" }),
> Please use Linux coding style.
>
>> +	},
>> +	{}
>> +};
>> +MODULE_DEVICE_TABLE(of, qmi_tmd_device_table);
>> +
>> +static struct platform_driver qmi_tmd_device_driver = {
>> +	.probe = qmi_tmd_client_probe,
>> +	.remove = qmi_tmd_client_remove,
>> +	.driver = {
>> +		.name = "qcom-qmi-cooling",
>> +		.of_match_table = qmi_tmd_device_table,
>> +	},
>
> Best regards,
> Krzysztof

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