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Date:	Wed, 22 Oct 2014 17:53:45 -0600
From:	Bjorn Helgaas <bhelgaas@...gle.com>
To:	Yijing Wang <wangyijing@...wei.com>
Cc:	linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
	Xinwei Hu <huxinwei@...wei.com>, Wuyun <wuyun.wu@...wei.com>,
	linux-arm-kernel@...ts.infradead.org,
	Russell King <linux@....linux.org.uk>,
	linux-arch@...r.kernel.org, arnab.basu@...escale.com,
	Bharat.Bhushan@...escale.com, x86@...nel.org,
	Arnd Bergmann <arnd@...db.de>,
	Thomas Gleixner <tglx@...utronix.de>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	xen-devel@...ts.xenproject.org, Joerg Roedel <joro@...tes.org>,
	iommu@...ts.linux-foundation.org, linux-mips@...ux-mips.org,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	linuxppc-dev@...ts.ozlabs.org, linux-s390@...r.kernel.org,
	Sebastian Ott <sebott@...ux.vnet.ibm.com>,
	Tony Luck <tony.luck@...el.com>, linux-ia64@...r.kernel.org,
	"David S. Miller" <davem@...emloft.net>,
	sparclinux@...r.kernel.org, Chris Metcalf <cmetcalf@...era.com>,
	Ralf Baechle <ralf@...ux-mips.org>,
	Lucas Stach <l.stach@...gutronix.de>,
	David Vrabel <david.vrabel@...rix.com>,
	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>,
	Michael Ellerman <mpe@...erman.id.au>,
	Thierry Reding <thierry.reding@...il.com>,
	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
	Liviu Dudau <liviu@...au.co.uk>
Subject: Re: [PATCH v3 24/27] IA64/MSI: Use MSI chip framework to configure
 MSI/MSI-X irq

On Wed, Oct 15, 2014 at 11:07:12AM +0800, Yijing Wang wrote:
> Use MSI chip framework instead of arch MSI functions to configure
> MSI/MSI-X irq. So we can manage MSI/MSI-X irq in a unified framework.

This needs slightly more detail.  You're using the MSI chip framework
"instead of arch MSI functions".  Well, there are still arch-specific
functions, i.e., arch_ia64_setup_msi_irq() and
arch_ia64_teardown_msi_irq().

We used to have arch_setup_msi_irq() which had a weak default
implementation, and a strong arch-specific implementation here, and you're
replacing that model with the new "msi-ops" model.  I don't know how you
want to write that, but it's not that you're getting rid of the
arch-specific code; you're keeping arch-specific code but structuring it
differently.

> Signed-off-by: Yijing Wang <wangyijing@...wei.com>
> ---
>  arch/ia64/include/asm/pci.h |   10 ++++++++++
>  arch/ia64/kernel/msi_ia64.c |   14 ++++++++++----
>  arch/ia64/pci/pci.c         |    1 +
>  3 files changed, 21 insertions(+), 4 deletions(-)
> 
> diff --git a/arch/ia64/include/asm/pci.h b/arch/ia64/include/asm/pci.h
> index 52af5ed..907dcba 100644
> --- a/arch/ia64/include/asm/pci.h
> +++ b/arch/ia64/include/asm/pci.h
> @@ -94,6 +94,7 @@ struct pci_controller {
>  	int segment;
>  	int node;		/* nearest node with memory or NUMA_NO_NODE for global allocation */
>  
> +	struct msi_chip *msi_chip;
>  	void *platform_data;
>  };
>  
> @@ -101,6 +102,15 @@ struct pci_controller {
>  #define PCI_CONTROLLER(busdev) ((struct pci_controller *) busdev->sysdata)
>  #define pci_domain_nr(busdev)    (PCI_CONTROLLER(busdev)->segment)
>  
> +extern struct msi_chip chip;

Please make this name more descriptive.  "chip" is way too generic for a
global name.

> +static inline struct msi_chip *pci_msi_chip(struct pci_bus *bus)
> +{
> +	struct pci_controller *ctrl = bus->sysdata;
> +
> +	return ctrl->msi_chip;
> +}
> +
>  extern struct pci_ops pci_root_ops;
>  
>  static inline int pci_proc_domain(struct pci_bus *bus)
> diff --git a/arch/ia64/kernel/msi_ia64.c b/arch/ia64/kernel/msi_ia64.c
> index 8c3730c..401fc98 100644
> --- a/arch/ia64/kernel/msi_ia64.c
> +++ b/arch/ia64/kernel/msi_ia64.c
> @@ -112,15 +112,16 @@ static struct irq_chip ia64_msi_chip = {
>  };
>  
>  
> -int arch_setup_msi_irq(struct pci_dev *pdev, struct msi_desc *desc)
> +static int arch_ia64_setup_msi_irq(struct msi_chip *chip,
> +		struct pci_dev *dev, struct msi_desc *desc)
>  {
>  	if (platform_setup_msi_irq)
> -		return platform_setup_msi_irq(pdev, desc);
> +		return platform_setup_msi_irq(dev, desc);
>  
> -	return ia64_setup_msi_irq(pdev, desc);
> +	return ia64_setup_msi_irq(dev, desc);

Please don't make gratuitous changes ("pdev" -> "dev") at the same time,
especially since the rest of the file still uses "pdev".

>  }
>  
> -void arch_teardown_msi_irq(unsigned int irq)
> +static void arch_ia64_teardown_msi_irq(struct msi_chip *chip, unsigned int irq)
>  {
>  	if (platform_teardown_msi_irq)
>  		return platform_teardown_msi_irq(irq);
> @@ -128,6 +129,11 @@ void arch_teardown_msi_irq(unsigned int irq)
>  	return ia64_teardown_msi_irq(irq);
>  }
>  
> +struct msi_chip chip = {
> +	.setup_irq = arch_ia64_setup_msi_irq,
> +	.teardown_irq = arch_ia64_teardown_msi_irq,
> +};
> +
>  #ifdef CONFIG_INTEL_IOMMU
>  #ifdef CONFIG_SMP
>  static int dmar_msi_set_affinity(struct irq_data *data,
> diff --git a/arch/ia64/pci/pci.c b/arch/ia64/pci/pci.c
> index 291a582..299b67d 100644
> --- a/arch/ia64/pci/pci.c
> +++ b/arch/ia64/pci/pci.c
> @@ -437,6 +437,7 @@ struct pci_bus *pci_acpi_scan_root(struct acpi_pci_root *root)
>  
>  	controller->companion = device;
>  	controller->node = acpi_get_node(device->handle);
> +	controller->msi_chip = &chip;
>  
>  	info = kzalloc(sizeof(*info), GFP_KERNEL);
>  	if (!info) {
> -- 
> 1.7.1
> 
> --
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