linux-kernel - Re: [PATCH v4 7/8] thermal: Add PCIe cooling driver

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Date: Fri, 5 Jan 2024 12:56:47 +0100
From: Christophe JAILLET <christophe.jaillet@...adoo.fr>
To: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
 linux-pci@...r.kernel.org, Bjorn Helgaas <bhelgaas@...gle.com>,
 Lorenzo Pieralisi <lorenzo.pieralisi@....com>, Rob Herring
 <robh@...nel.org>, Krzysztof Wilczyński <kw@...ux.com>,
 Lukas Wunner <lukas@...ner.de>, Alexandru Gagniuc <mr.nuke.me@...il.com>,
 Krishna chaitanya chundru <quic_krichai@...cinc.com>,
 Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
 "Rafael J. Wysocki" <rafael@...nel.org>, linux-pm@...r.kernel.org,
 Daniel Lezcano <daniel.lezcano@...aro.org>, Zhang Rui <rui.zhang@...el.com>,
 Lukasz Luba <lukasz.luba@....com>, linux-kernel@...r.kernel.org
Cc: Alex Deucher <alexdeucher@...il.com>, Amit Kucheria <amitk@...nel.org>
Subject: Re: [PATCH v4 7/8] thermal: Add PCIe cooling driver

Le 05/01/2024 à 12:25, Ilpo Järvinen a écrit :
> Add a thermal cooling driver to provide path to access PCIe bandwidth
> controller using the usual thermal interfaces.
> 
> A cooling device is instantiated for controllable PCIe Ports from the
> bwctrl service driver.
> 
> The thermal side state 0 means no throttling, i.e., maximum supported
> PCIe Link Speed.
> 
> Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
> Acked-by: Rafael J. Wysocki <rafael@...nel.org> # From the cooling device interface perspective
> ---

...

> +struct thermal_cooling_device *pcie_cooling_device_register(struct pci_dev *port,
> +							    struct pcie_device *pdev)
> +{
> +	struct pcie_cooling_device *pcie_cdev;
> +	struct thermal_cooling_device *cdev;
> +	size_t name_len;
> +	char *name;
> +
> +	pcie_cdev = kzalloc(sizeof(*pcie_cdev), GFP_KERNEL);
> +	if (!pcie_cdev)
> +		return ERR_PTR(-ENOMEM);
> +
> +	pcie_cdev->port = port;
> +	pcie_cdev->pdev = pdev;
> +
> +	name_len = strlen(COOLING_DEV_TYPE_PREFIX) + strlen(pci_name(port)) + 1;
> +	name = kzalloc(name_len, GFP_KERNEL);
> +	if (!name) {
> +		kfree(pcie_cdev);
> +		return ERR_PTR(-ENOMEM);
> +	}
> +
> +	snprintf(name, name_len, COOLING_DEV_TYPE_PREFIX "%s", pci_name(port));

Nit: kasprintf() ?

> +	cdev = thermal_cooling_device_register(name, pcie_cdev, &pcie_cooling_ops);
> +	kfree(name);
> +
> +	return cdev;
> +}