linux-kernel - Re: [PATCH v5 7/8] thermal: Add PCIe cooling driver

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Date: Thu, 9 May 2024 12:59:36 +0100
From: Jonathan Cameron <Jonathan.Cameron@...wei.com>
To: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
CC: <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>, Amit Kucheria
	<amitk@...nel.org>, Christophe JAILLET <christophe.jaillet@...adoo.fr>
Subject: Re: [PATCH v5 7/8] thermal: Add PCIe cooling driver

On Wed,  8 May 2024 16:47:43 +0300
Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com> wrote:

> 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 thermal_cooling_device *cdev;
> +	char *name;
> +
> +	name = kasprintf(GFP_KERNEL, COOLING_DEV_TYPE_PREFIX "%s", pci_name(port));
> +	if (!name)
> +		return ERR_PTR(-ENOMEM);
> +
> +	cdev = thermal_cooling_device_register(name, port, &pcie_cooling_ops);
> +	kfree(name);

__free?  Only small saving, but I think it's just about worth it to
give you
	return thermal_cooling_device_register()
and drop the local cdev variable.


> +
> +	return cdev;
> +}

Otherwise LGTM
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>