linux-kernel - Re: [PATCH v4] PCI: Relabel JHL6540 on Lenovo X1 Carbon 7,8

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Message-ID: <ZYTHJtn52MseDbr_@google.com>
Date: Thu, 21 Dec 2023 15:15:50 -0800
From: Dmitry Torokhov <dmitry.torokhov@...il.com>
To: Esther Shimanovich <eshimanovich@...omium.org>
Cc: Bjorn Helgaas <bhelgaas@...gle.com>, linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org, Rajat Jain <rajatja@...gle.com>
Subject: Re: [PATCH v4] PCI: Relabel JHL6540 on Lenovo X1 Carbon 7,8

On Thu, Dec 21, 2023 at 03:53:42PM -0500, Esther Shimanovich wrote:
> +static void carbon_X1_fixup_relabel_alpine_ridge(struct pci_dev *dev)
> +{
> +	/* Is this JHL6540 PCI component embedded in a Lenovo device? */
> +	if (dev->subsystem_vendor != PCI_VENDOR_ID_LENOVO)
> +		return;
> +
> +	/* Is this JHL6540 PCI component embedded in an X1 Carbon Gen 7/8? */
> +	if (dev->subsystem_device != 0x22be && // Gen 8
> +	    dev->subsystem_device != 0x2292) { // Gen 7
> +		return;
> +	}
> +
> +	dev_set_removable(&dev->dev, DEVICE_FIXED);
> +
> +	/* Not all 0x15d3 components are external facing */
> +	if (dev->device == 0x15d3 &&
> +	    dev->devfn != 0x08 &&
> +	    dev->devfn != 0x20) {
> +		return;
> +	}
> +
> +	dev->external_facing = true;
> +}
> +
> +/*
> + * We also need to relabel the root port as a consequence of changing
> + * the JHL6540's PCIE hierarchy.
> + */
> +static void carbon_X1_fixup_rootport_not_removable(struct pci_dev *dev)
> +{
> +	/* Is this JHL6540 PCI component embedded in a Lenovo device? */
> +	if (dev->subsystem_vendor != PCI_VENDOR_ID_LENOVO)
> +		return;
> +
> +	/* Is this JHL6540 PCI component embedded in an X1 Carbon Gen 7/8? */
> +	if (dev->subsystem_device != 0x22be && // Gen 8
> +	    dev->subsystem_device != 0x2292) { // Gen 7
> +		return;
> +	}

This ventures into the realm of nitpicking, but this can be factored out
into a helper.

I'll shut up now and let PCI folks handle this.

Thanks.

-- 
Dmitry