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

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Date:	Thu, 12 Jun 2008 16:14:25 +0200
From:	Olaf Dabrunz <od@...e.de>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	Olaf Dabrunz <od@...e.de>, 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>,
	Ihno Krumreich <ihno@...e.de>,
	Sven Dietrich <sdietrich@...e.de>,
	Daniel Gollub <dgollub@...e.de>,
	Felix Foerster <ffoerster@...e.de>
Subject: Re: [PATCH 5/7] disable AMD/ATI legacy boot interrupt generation

On 03-Jun-08, Thomas Gleixner wrote:
> 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 ?

To prevent spilling of constants to other code... Probably unneeded...

> > +
> > +#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 ?

Yep :)

> > +
> > +	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

murmur... :)

> > +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
> > 

-- 
Olaf Dabrunz (od/odabrunz), SUSE Linux Products GmbH, Nürnberg

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