linux-kernel - Re: [PATCH 3/5] arm64, pci: Allow RC drivers to supply pcibios_add

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Message-ID: <20150716090426.GA17097@red-moon>
Date:	Thu, 16 Jul 2015 10:04:26 +0100
From:	Lorenzo Pieralisi <lorenzo.pieralisi@....com>
To:	David Daney <ddaney.cavm@...il.com>
Cc:	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Catalin Marinas <Catalin.Marinas@....com>,
	Will Deacon <Will.Deacon@....com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Jason Cooper <jason@...edaemon.net>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Robert Richter <rrichter@...ium.com>,
	David Daney <david.daney@...ium.com>
Subject: Re: [PATCH 3/5] arm64, pci: Allow RC drivers to supply
 pcibios_add_device() implementation.

Hi David,

On Wed, Jul 15, 2015 at 05:54:43PM +0100, David Daney wrote:
> From: David Daney <david.daney@...ium.com>
> 
> The default is to continue doing the what we have done before, but add
> a hook so that this can be overridden.

This commit log is inappropriate. On top of that, it is already
complicated enough to keep ARM and ARM64 in sync, I can't even
imagine what would happen if we added a hook to pcibios_add_device
so that RCs can implement their quirks beyond ARM64 core control.

> Signed-off-by: David Daney <david.daney@...ium.com>
> ---
>  arch/arm64/include/asm/pci.h |  3 +++
>  arch/arm64/kernel/pci.c      | 10 ++++++++++
>  2 files changed, 13 insertions(+)
> 
> diff --git a/arch/arm64/include/asm/pci.h b/arch/arm64/include/asm/pci.h
> index b008a72..ad3fb18 100644
> --- a/arch/arm64/include/asm/pci.h
> +++ b/arch/arm64/include/asm/pci.h
> @@ -37,6 +37,9 @@ static inline int pci_proc_domain(struct pci_bus *bus)
>  {
>  	return 1;
>  }
> +
> +void set_pcibios_add_device(int (*arg)(struct pci_dev *));
> +
>  #endif  /* CONFIG_PCI */
>  
>  #endif  /* __KERNEL__ */
> diff --git a/arch/arm64/kernel/pci.c b/arch/arm64/kernel/pci.c
> index 4095379..3356023 100644
> --- a/arch/arm64/kernel/pci.c
> +++ b/arch/arm64/kernel/pci.c
> @@ -38,11 +38,21 @@ resource_size_t pcibios_align_resource(void *data, const struct resource *res,
>  	return res->start;
>  }
>  
> +static int (*pcibios_add_device_impl)(struct pci_dev *);
> +
> +void set_pcibios_add_device(int (*arg)(struct pci_dev *))
> +{
> +	pcibios_add_device_impl = arg;
> +}
> +
>  /*
>   * Try to assign the IRQ number from DT when adding a new device
>   */
>  int pcibios_add_device(struct pci_dev *dev)
>  {
> +	if (pcibios_add_device_impl)
> +		return pcibios_add_device_impl(dev);

I am totally against this (and to be honest by reading the other
patches I failed to understand why you even need it), see above.

Thanks,
Lorenzo

> +
>  	dev->irq = of_irq_parse_and_map_pci(dev, 0, 0);
>  
>  	return 0;
> -- 
> 1.9.1
> 
> --
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