linux-kernel - Re: [PATCH 2/2] PCI: apple: Convert to {en,dis}able

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Message-ID: <Z1CFTb8d1SfAmP2w@lizhi-Precision-Tower-5810>
Date: Wed, 4 Dec 2024 11:37:33 -0500
From: Frank Li <Frank.li@....com>
To: Marc Zyngier <maz@...nel.org>
Cc: linux-pci@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org, Bjorn Helgaas <bhelgaas@...gle.com>,
	Lorenzo Pieralisi <lpieralisi@...nel.org>,
	Krzysztof Wilczyński <kw@...ux.com>,
	Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
	Rob Herring <robh@...nel.org>,
	Alyssa Rosenzweig <alyssa@...enzweig.io>
Subject: Re: [PATCH 2/2] PCI: apple: Convert to {en,dis}able_device()
 callbacks

On Wed, Dec 04, 2024 at 03:01:45PM +0000, Marc Zyngier wrote:
> Now that the core host-bridge infrastructure is able to give
> us a callback on each device being added or removed, convert
> the bus-notifier hack to it.
>
> Signed-off-by: Marc Zyngier <maz@...nel.org>

Reviewed-by: Frank Li <Frank.Li@....com>


> ---
>  drivers/pci/controller/pcie-apple.c | 75 ++++++-----------------------
>  1 file changed, 15 insertions(+), 60 deletions(-)
>
> diff --git a/drivers/pci/controller/pcie-apple.c b/drivers/pci/controller/pcie-apple.c
> index fefab2758a064..a7e51bc1c2fe8 100644
> --- a/drivers/pci/controller/pcie-apple.c
> +++ b/drivers/pci/controller/pcie-apple.c
> @@ -26,7 +26,6 @@
>  #include <linux/list.h>
>  #include <linux/module.h>
>  #include <linux/msi.h>
> -#include <linux/notifier.h>
>  #include <linux/of_irq.h>
>  #include <linux/pci-ecam.h>
>
> @@ -667,12 +666,16 @@ static struct apple_pcie_port *apple_pcie_get_port(struct pci_dev *pdev)
>  	return NULL;
>  }
>
> -static int apple_pcie_add_device(struct apple_pcie_port *port,
> -				 struct pci_dev *pdev)
> +static int apple_pcie_enable_device(struct pci_host_bridge *bridge, struct pci_dev *pdev)
>  {
>  	u32 sid, rid = pci_dev_id(pdev);
> +	struct apple_pcie_port *port;
>  	int idx, err;
>
> +	port = apple_pcie_get_port(pdev);
> +	if (!port)
> +		return 0;
> +
>  	dev_dbg(&pdev->dev, "added to bus %s, index %d\n",
>  		pci_name(pdev->bus->self), port->idx);
>
> @@ -698,12 +701,16 @@ static int apple_pcie_add_device(struct apple_pcie_port *port,
>  	return idx >= 0 ? 0 : -ENOSPC;
>  }
>
> -static void apple_pcie_release_device(struct apple_pcie_port *port,
> -				      struct pci_dev *pdev)
> +static void apple_pcie_disable_device(struct pci_host_bridge *bridge, struct pci_dev *pdev)
>  {
> +	struct apple_pcie_port *port;
>  	u32 rid = pci_dev_id(pdev);
>  	int idx;
>
> +	port = apple_pcie_get_port(pdev);
> +	if (!port)
> +		return;
> +
>  	mutex_lock(&port->pcie->lock);
>
>  	for_each_set_bit(idx, port->sid_map, port->sid_map_sz) {
> @@ -721,45 +728,6 @@ static void apple_pcie_release_device(struct apple_pcie_port *port,
>  	mutex_unlock(&port->pcie->lock);
>  }
>
> -static int apple_pcie_bus_notifier(struct notifier_block *nb,
> -				   unsigned long action,
> -				   void *data)
> -{
> -	struct device *dev = data;
> -	struct pci_dev *pdev = to_pci_dev(dev);
> -	struct apple_pcie_port *port;
> -	int err;
> -
> -	/*
> -	 * This is a bit ugly. We assume that if we get notified for
> -	 * any PCI device, we must be in charge of it, and that there
> -	 * is no other PCI controller in the whole system. It probably
> -	 * holds for now, but who knows for how long?
> -	 */
> -	port = apple_pcie_get_port(pdev);
> -	if (!port)
> -		return NOTIFY_DONE;
> -
> -	switch (action) {
> -	case BUS_NOTIFY_ADD_DEVICE:
> -		err = apple_pcie_add_device(port, pdev);
> -		if (err)
> -			return notifier_from_errno(err);
> -		break;
> -	case BUS_NOTIFY_DEL_DEVICE:
> -		apple_pcie_release_device(port, pdev);
> -		break;
> -	default:
> -		return NOTIFY_DONE;
> -	}
> -
> -	return NOTIFY_OK;
> -}
> -
> -static struct notifier_block apple_pcie_nb = {
> -	.notifier_call = apple_pcie_bus_notifier,
> -};
> -
>  static int apple_pcie_init(struct pci_config_window *cfg)
>  {
>  	struct device *dev = cfg->parent;
> @@ -799,23 +767,10 @@ static int apple_pcie_init(struct pci_config_window *cfg)
>  	return 0;
>  }
>
> -static int apple_pcie_probe(struct platform_device *pdev)
> -{
> -	int ret;
> -
> -	ret = bus_register_notifier(&pci_bus_type, &apple_pcie_nb);
> -	if (ret)
> -		return ret;
> -
> -	ret = pci_host_common_probe(pdev);
> -	if (ret)
> -		bus_unregister_notifier(&pci_bus_type, &apple_pcie_nb);
> -
> -	return ret;
> -}
> -
>  static const struct pci_ecam_ops apple_pcie_cfg_ecam_ops = {
>  	.init		= apple_pcie_init,
> +	.enable_device	= apple_pcie_enable_device,
> +	.disable_device	= apple_pcie_disable_device,
>  	.pci_ops	= {
>  		.map_bus	= pci_ecam_map_bus,
>  		.read		= pci_generic_config_read,
> @@ -830,7 +785,7 @@ static const struct of_device_id apple_pcie_of_match[] = {
>  MODULE_DEVICE_TABLE(of, apple_pcie_of_match);
>
>  static struct platform_driver apple_pcie_driver = {
> -	.probe	= apple_pcie_probe,
> +	.probe	= pci_host_common_probe,
>  	.driver	= {
>  		.name			= "pcie-apple",
>  		.of_match_table		= apple_pcie_of_match,
> --
> 2.39.2
>