linux-kernel - Re: [PATCH 1/2] PCI: host-generic: Allow {en,dis}able_device() to be provided via pci_ecam

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Message-ID: <Z1CEyAJn8OnxEHUO@lizhi-Precision-Tower-5810>
Date: Wed, 4 Dec 2024 11:35:20 -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 1/2] PCI: host-generic: Allow {en,dis}able_device() to be
 provided via pci_ecam_ops

On Wed, Dec 04, 2024 at 03:01:44PM +0000, Marc Zyngier wrote:
> In order to let host controller drivers using the host-generic
> infrastructure use the {en,dis}able_device() callbacks that can
> be used to configure sideband RID mapping hardware, provide these
> two callbacks as part of the pci_ecap_ops structure.
>
> Signed-off-by: Marc Zyngier <maz@...nel.org>

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

> ---
>  drivers/pci/controller/pci-host-common.c | 2 ++
>  include/linux/pci-ecam.h                 | 4 ++++
>  2 files changed, 6 insertions(+)
>
> diff --git a/drivers/pci/controller/pci-host-common.c b/drivers/pci/controller/pci-host-common.c
> index cf5f59a745b37..f441bfd6f96a8 100644
> --- a/drivers/pci/controller/pci-host-common.c
> +++ b/drivers/pci/controller/pci-host-common.c
> @@ -75,6 +75,8 @@ int pci_host_common_probe(struct platform_device *pdev)
>
>  	bridge->sysdata = cfg;
>  	bridge->ops = (struct pci_ops *)&ops->pci_ops;
> +	bridge->enable_device = ops->enable_device;
> +	bridge->disable_device = ops->disable_device;
>  	bridge->msi_domain = true;
>
>  	return pci_host_probe(bridge);
> diff --git a/include/linux/pci-ecam.h b/include/linux/pci-ecam.h
> index 3a4860bd27586..3a10f8cfc3ad5 100644
> --- a/include/linux/pci-ecam.h
> +++ b/include/linux/pci-ecam.h
> @@ -45,6 +45,10 @@ struct pci_ecam_ops {
>  	unsigned int			bus_shift;
>  	struct pci_ops			pci_ops;
>  	int				(*init)(struct pci_config_window *);
> +	int				(*enable_device)(struct pci_host_bridge *,
> +							 struct pci_dev *);
> +	void				(*disable_device)(struct pci_host_bridge *,
> +							  struct pci_dev *);
>  };
>
>  /*
> --
> 2.39.2
>