linux-kernel - Re: [RFC PATCH 09/16] PCI: Associate .get_msi_ctrl() with pci_host

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Date:	Mon, 17 Nov 2014 15:03:38 +0000
From:	Lorenzo Pieralisi <lorenzo.pieralisi@....com>
To:	Yijing Wang <wangyijing@...wei.com>
Cc:	Bjorn Helgaas <bhelgaas@...gle.com>,
	Liviu Dudau <liviu@...au.co.uk>,
	Tony Luck <tony.luck@...el.com>,
	Russell King <linux@....linux.org.uk>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	"x86@...nel.org" <x86@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"huxinwei@...wei.com" <huxinwei@...wei.com>,
	Thierry Reding <thierry.reding@...il.com>,
	Yijing Wang <wangyijing0307@...il.com>,
	"suravee.suthikulpanit@....com" <suravee.suthikulpanit@....com>,
	"linux-ia64@...r.kernel.org" <linux-ia64@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Wuyun <wuyun.wu@...wei.com>,
	"linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [RFC PATCH 09/16] PCI: Associate .get_msi_ctrl() with
 pci_host_bridge

On Mon, Nov 17, 2014 at 10:21:43AM +0000, Yijing Wang wrote:
> From: Yijing Wang <wangyijing0307@...il.com>
> 
> Signed-off-by: Yijing Wang <wangyijing@...wei.com>
> ---
>  drivers/pci/host-bridge.c |    1 +
>  include/linux/pci.h       |    2 ++
>  2 files changed, 3 insertions(+), 0 deletions(-)
> 
> diff --git a/drivers/pci/host-bridge.c b/drivers/pci/host-bridge.c
> index 49b6c21..872cae1 100644
> --- a/drivers/pci/host-bridge.c
> +++ b/drivers/pci/host-bridge.c
> @@ -58,6 +58,7 @@ struct pci_host_bridge *pci_create_host_bridge(
>  	host->dev.parent = parent;
>  	INIT_LIST_HEAD(&host->windows);
>  	host->dev.release = pci_release_host_bridge_dev;
> +	host->get_msi_ctrl = info->get_msi_ctrl;
>  
>  	/* this is hack, just for build, will be removed later*/
>  	b = kzalloc(sizeof(*b), GFP_KERNEL);
> diff --git a/include/linux/pci.h b/include/linux/pci.h
> index a51f5f5..af1ee86 100644
> --- a/include/linux/pci.h
> +++ b/include/linux/pci.h
> @@ -408,6 +408,7 @@ struct pci_host_bridge {
>  	int domain;
>  	void *sysdata;
>  	struct pci_ops *ops;
> +	struct msi_controller *(*get_msi_ctrl)(struct pci_dev *pdev);
>  	void (*release_fn)(struct pci_host_bridge *);
>  	void *release_data;
>  };
> @@ -416,6 +417,7 @@ struct pci_host_info {
>  	u8 res_type;
>  	void *arg;
>  	struct list_head *resources; /*just for build, will clean up later */
> +	struct msi_controller *(*get_msi_ctrl)(struct pci_dev *pdev);
>  	int (*init_res)(struct pci_host_bridge *host, 
>  			struct pci_host_info *info);
>  };

Where would you use the get_msi_ctrl pointer then ? Wasn't it better
to wait for this patchset to take shape before adding more churn to
the ARM (and other archs) pci_sys_data structure and consequently add
another pcibios call to achieve what the get_msi_ctrl pointer is there to
achieve (ie making msi_controller retrieval arch independent ?)

I just do not see what the pci_sys_data intermediate step buys you if
we consider the approach taken in this patch as the proper solution.

Thanks,
Lorenzo

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