linux-kernel - Re: [PATCH 5/7] disable AMD/ATI legacy boot interrupt generation

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Date:	Tue, 3 Jun 2008 12:54:02 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Olaf Dabrunz <od@...e.de>
cc:	Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>,
	Jon Masters <jonathan@...masters.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Stefan Assmann <sassmann@...e.de>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Jesse Barnes <jbarnes@...tuousgeek.org>
Subject: Re: [PATCH 5/7] disable AMD/ATI legacy boot interrupt generation

On Mon, 2 Jun 2008, Olaf Dabrunz wrote:
>  
>  /*
> + * disable boot interrupts on AMD and ATI chipsets
> + */
> +#define PCI_X_MISC			0x40
> +#define  PCI_X_AMD813X_NIOAMODE		(1<<0)

new line before the function and consistent spacing

> +static void quirk_disable_amd_813x_boot_interrupt(struct pci_dev *dev)
> +{
> +	u32 pci_x_misc;
> +
> +	if (nobootirqquirk)
> +		return;
> +
> +	pci_read_config_dword(dev, PCI_X_MISC, &pci_x_misc);
> +	pci_x_misc &= ~PCI_X_AMD813X_NIOAMODE;
> +	pci_write_config_dword(dev, PCI_X_MISC, pci_x_misc);
> +
> +	printk(KERN_INFO "disabled boot interrupts on PCI device "
> +			"0x%04x:0x%04x\n", dev->vendor, dev->device);
> +}
> +#undef PCI_X_MISC
> +#undef PCI_X_AMD813X_NIOAMODE

why #undef ?

> +
> +#define PCI_AMD8111_PCI_IRQ_ROUTING	0x56
> +static void quirk_disable_amd_8111_boot_interrupt(struct pci_dev *dev)
> +{
> +	u16 pci_irq_routing;
> +
> +	if (nobootirqquirk)
> +		return;
> +
> +	pci_read_config_word(dev, PCI_AMD8111_PCI_IRQ_ROUTING,
> +						&pci_irq_routing);
> +	if (!pci_irq_routing) {
> +		printk(KERN_INFO "boot interrupts on PCI "
> +				"device 0x%04x:0x%04x were "
> +				"already disabled\n",
> +				dev->vendor, dev->device);
> +		return;
> +	}
> +	pci_write_config_word(dev, PCI_AMD8111_PCI_IRQ_ROUTING, 0);
> +	printk(KERN_INFO "disabled boot interrupts on PCI device "
> +			"0x%04x:0x%04x\n", dev->vendor, dev->device);
> +}
> +#undef PCI_AMD8111_PCI_IRQ_ROUTING
> +DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_AMD,   PCI_DEVICE_ID_AMD_8111_SMBUS, 	quirk_disable_amd_8111_boot_interrupt);
> +
> +#define PCI_AMD_SB700S_FEATURES_ENABLE	0x64
> +#define  PCI_AMD_SB700S_PIC_ENABLE	(1<<0)
> +#define PIC_PCI_INTR_INDEX		0xC00
> +#define PIC_PCI_INTR_DATA		0xC01
> +#define CLEAR_PIC_IRQ_ROUTING(irq)					\
> +	outb(irq, PIC_PCI_INTR_INDEX);					\
> +	outb(0x00, PIC_PCI_INTR_DATA);

Please use an inline function

> +static void quirk_disable_amd_sb700s_boot_interrupt(struct pci_dev *dev)
> +{
> +	u32 feature_enable;
> +	u32 saved_feature_enable;
> +
> +	if (nobootirqquirk)
> +		return;
> +
> +	pci_read_config_dword(dev, PCI_AMD_SB700S_FEATURES_ENABLE,
> +						&feature_enable);
> +	saved_feature_enable = feature_enable;
> +	feature_enable |= PCI_AMD_SB700S_PIC_ENABLE;
> +	pci_write_config_dword(dev, PCI_AMD_SB700S_FEATURES_ENABLE,
> +						feature_enable);
> +
> +	CLEAR_PIC_IRQ_ROUTING(0x0);
> +	CLEAR_PIC_IRQ_ROUTING(0x1);
> +	CLEAR_PIC_IRQ_ROUTING(0x2);
> +	CLEAR_PIC_IRQ_ROUTING(0x3);
> +	CLEAR_PIC_IRQ_ROUTING(0x4);
> +	CLEAR_PIC_IRQ_ROUTING(0x9);
> +	CLEAR_PIC_IRQ_ROUTING(0xA);
> +	CLEAR_PIC_IRQ_ROUTING(0xB);
> +	CLEAR_PIC_IRQ_ROUTING(0xC);

  	int i, irqs[] = {0x0,.....0x0c};

	for (i = 0; i < ARRAY_SIZE(irqs); i++) {
	    outb(...);
	    outb(...);
	}
	  
  perhaps ?

> +
> +	pci_write_config_dword(dev, PCI_AMD_SB700S_FEATURES_ENABLE,
> +						saved_feature_enable);
> +
> +	printk(KERN_INFO "disabled boot interrupts on PCI device "
> +			"0x%04x:0x%04x\n", dev->vendor, dev->device);
> +}
> +#undef PCI_AMD_SB700S_FEATURES_ENABLE
> +#undef PCI_AMD_SB700S_PIC_ENABLE
> +#undef PIC_PCI_INTR_INDEX
> +#undef PIC_PCI_INTR_DATA
> +#undef CLEAR_PIC_IRQ_ROUTING

grmbl

> +DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_ATI,   PCI_DEVICE_ID_ATI_IXP600_SMBUS, 	quirk_disable_amd_sb700s_boot_interrupt);
> +
> +/*
>   * disabled boot interrupts on HT-1000
>   */
>  static void quirk_disable_broadcom_boot_interrupt(struct pci_dev *dev)
> -- 
> 1.5.2.4
> 
> -- 
> Olaf Dabrunz (od/odabrunz), SUSE Linux Products GmbH, N??rnberg
> 
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