linux-kernel - Re: [PATCH 3/7] disable legacy boot interrupt generation

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Date:	Tue, 3 Jun 2008 12:40:04 +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 3/7] disable legacy boot interrupt generation

On Mon, 2 Jun 2008, Olaf Dabrunz wrote:
> diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
> index 6173be5..8f09f8f 100644
> --- a/drivers/pci/quirks.c
> +++ b/drivers/pci/quirks.c
> @@ -1377,6 +1377,34 @@ int nobootirqquirk_setup(char *str)
>  __setup("nobootirqquirk", nobootirqquirk_setup);
>  
>  /*
> + * On some chipsets we can disable the generation of legacy INTx boot
> + * interrupts.
> + */
> +#define PCI_IOAPIC_ALTERNATE_BASE_ADDRESS	0x40
> +#define INTEL_6300_ESB_BOOT_INTERRUPT_ENABLE	(1<<14)

new line

> +static void quirk_disable_intel_boot_interrupt(struct pci_dev *dev)
> +{
> +	u16 cnf;
> +
> +	if (nobootirqquirk)
> +		return;
> +
> +	pci_read_config_word(dev, PCI_IOAPIC_ALTERNATE_BASE_ADDRESS, &cnf);
> +	/* this disables the boot interrupt even though it reads ENABLE */

And why cant we use a name for that constant which makes this obvious
w/o a comment ?

> +	cnf |= INTEL_6300_ESB_BOOT_INTERRUPT_ENABLE;
> +	pci_write_config_word(dev, PCI_IOAPIC_ALTERNATE_BASE_ADDRESS, cnf);
> +
> +	printk(KERN_INFO "disabled boot interrupt on device 0x%04x:0x%04x\n",
> +		dev->vendor, dev->device);
> +}
> +#undef PCI_IOAPIC_ALTERNATE_BASE_ADDRESS

Why #undef ?

> +/*
> + * IO-APIC1 on 6300ESB generates boot interrupts, see intel order no
> + * 300641-004US, section 5.7.3.
> + */
> +DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_INTEL,   PCI_DEVICE_ID_INTEL_ESB_10, 	quirk_disable_intel_boot_interrupt);
> +
> +/*
>   * Boot interrupts on some chipsets cannot be turned off. For these chipsets,
>   * remap the original interrupt in the linux kernel to the boot interrupt, so
>   * that a PCI device's interrupt handler is installed on the boot interrupt
> diff --git a/include/linux/pci_ids.h b/include/linux/pci_ids.h
> index c675399..b89616d 100644
> --- a/include/linux/pci_ids.h
> +++ b/include/linux/pci_ids.h
> @@ -2309,6 +2309,7 @@
>  #define PCI_DEVICE_ID_INTEL_ESB_4	0x25a4
>  #define PCI_DEVICE_ID_INTEL_ESB_5	0x25a6
>  #define PCI_DEVICE_ID_INTEL_ESB_9	0x25ab
> +#define PCI_DEVICE_ID_INTEL_ESB_10	0x25ac
>  #define PCI_DEVICE_ID_INTEL_82820_HB	0x2500
>  #define PCI_DEVICE_ID_INTEL_82820_UP_HB	0x2501
>  #define PCI_DEVICE_ID_INTEL_82850_HB	0x2530
> -- 
> 1.5.2.4
> 
> -- 
> Olaf Dabrunz (od/odabrunz), SUSE Linux Products GmbH, N??rnberg
> 
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