linux-kernel - Re: [RFC PATCH 07/20] x86/MSI: Use msi_chip instead of arch func to configure MSI/MSI-X

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Message-ID: <20140812190947.GD13996@laptop.dumpdata.com>
Date:	Tue, 12 Aug 2014 15:09:47 -0400
From:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To:	Yijing Wang <wangyijing@...wei.com>
Cc:	Bjorn Helgaas <bhelgaas@...gle.com>, linux-kernel@...r.kernel.org,
	Xinwei Hu <huxinwei@...wei.com>, Wuyun <wuyun.wu@...wei.com>,
	linux-pci@...r.kernel.org, Marc Zyngier <marc.zyngier@....com>,
	linux-arm-kernel@...ts.infradead.org,
	Russell King <linux@....linux.org.uk>,
	arnab.basu@...escale.com, x86@...nel.org,
	Arnd Bergmann <arnd@...db.de>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.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>
Subject: Re: [RFC PATCH 07/20] x86/MSI: Use msi_chip instead of arch func to
 configure MSI/MSI-X

On Tue, Aug 12, 2014 at 03:26:00PM +0800, Yijing Wang wrote:
> Introduce a new struct msi_chip apic_msi_chip instead of weak arch
> functions to configure MSI/MSI-X in x86.

Why not 'x86_msi_ops' (see  arch/x86/kernel/x86_init.c)
> 
> Signed-off-by: Yijing Wang <wangyijing@...wei.com>
> ---
>  arch/x86/include/asm/pci.h     |    1 +
>  arch/x86/kernel/apic/io_apic.c |   20 ++++++++++++++++----
>  2 files changed, 17 insertions(+), 4 deletions(-)
> 
> diff --git a/arch/x86/include/asm/pci.h b/arch/x86/include/asm/pci.h
> index 0892ea0..878a06d 100644
> --- a/arch/x86/include/asm/pci.h
> +++ b/arch/x86/include/asm/pci.h
> @@ -101,6 +101,7 @@ void native_teardown_msi_irq(unsigned int irq);
>  void native_restore_msi_irqs(struct pci_dev *dev);
>  int setup_msi_irq(struct pci_dev *dev, struct msi_desc *msidesc,
>  		  unsigned int irq_base, unsigned int irq_offset);
> +extern struct msi_chip *x86_msi_chip;
>  #else
>  #define native_setup_msi_irqs		NULL
>  #define native_teardown_msi_irq		NULL
> diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
> index 2609dcd..eb8ab7c 100644
> --- a/arch/x86/kernel/apic/io_apic.c
> +++ b/arch/x86/kernel/apic/io_apic.c
> @@ -3077,24 +3077,25 @@ int setup_msi_irq(struct pci_dev *dev, struct msi_desc *msidesc,
>  	return 0;
>  }
>  
> -int native_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
> +int native_setup_msi_irqs(struct device *dev, int nvec, int type)
>  {
>  	struct msi_desc *msidesc;
>  	unsigned int irq;
>  	int node, ret;
> +	struct pci_dev *pdev = to_pci_dev(dev);
>  
>  	/* Multiple MSI vectors only supported with interrupt remapping */
>  	if (type == PCI_CAP_ID_MSI && nvec > 1)
>  		return 1;
>  
> -	node = dev_to_node(&dev->dev);
> +	node = dev_to_node(dev);
>  
> -	list_for_each_entry(msidesc, &dev->msi_list, list) {
> +	list_for_each_entry(msidesc, &pdev->msi_list, list) {
>  		irq = irq_alloc_hwirq(node);
>  		if (!irq)
>  			return -ENOSPC;
>  
> -		ret = setup_msi_irq(dev, msidesc, irq, 0);
> +		ret = setup_msi_irq(pdev, msidesc, irq, 0);
>  		if (ret < 0) {
>  			irq_free_hwirq(irq);
>  			return ret;
> @@ -3214,6 +3215,17 @@ int default_setup_hpet_msi(unsigned int irq, unsigned int id)
>  }
>  #endif
>  
> +struct msi_chip apic_msi_chip = {
> +	.setup_irqs = native_setup_msi_irqs,
> +	.teardown_irq = native_teardown_msi_irq,
> +};
> +
> +struct msi_chip *arch_get_match_msi_chip(struct device *dev)
> +{
> +	return x86_msi_chip;
> +}
> +
> +struct msi_chip *x86_msi_chip = &apic_msi_chip;
>  #endif /* CONFIG_PCI_MSI */
>  /*
>   * Hypertransport interrupt support
> -- 
> 1.7.1
> 
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