linux-kernel - Re: What was in the x86 merge for .20

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Date:	Sat, 9 Dec 2006 00:41:40 -0800
From:	Andrew Morton <akpm@...l.org>
To:	"Siddha, Suresh B" <suresh.b.siddha@...el.com>
Cc:	Andi Kleen <ak@...e.de>, linux-kernel@...r.kernel.org,
	discuss@...-64.org, "Li, Shaohua" <shaohua.li@...el.com>,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: What was in the x86 merge for .20

On Fri, 8 Dec 2006 10:00:04 -0800
"Siddha, Suresh B" <suresh.b.siddha@...el.com> wrote:

> On Fri, Dec 08, 2006 at 06:10:29PM +0100, Andi Kleen wrote:
> > Yes please check the mainline git tree.
> 
> Ok. I think I am the culprit :(
> 
> Andi, Attached patch should fix the panic issue that Andrew encountered.
> Andrew, please confirm.
> 
> Andi, if you are applying Ingo's genapic changes and reverting this quirk
> changes in git, then there is no need to apply the appended patch.
> 
> Personally, I would like to go with Ingo's changes as it cleans up quite 
> a bit of code.
> 
> thanks,
> suresh
> --
> 
> [patch] i386: Fix the verify_quirk_intel_irqbalance()
> 
> Fix the verify_quirk_intel_irqbalance(). genapic checks should really
> happen only on affected versions of the E7520/E7320/E7525 based platforms.
> 
> Signed-off-by: Suresh Siddha <suresh.b.siddha@...el.com>
> 
> diff --git a/arch/i386/kernel/quirks.c b/arch/i386/kernel/quirks.c
> index a01320a..34874c3 100644
> --- a/arch/i386/kernel/quirks.c
> +++ b/arch/i386/kernel/quirks.c
> @@ -10,13 +10,38 @@ #include <asm/cpu.h>
>  #if defined(CONFIG_X86_IO_APIC) && defined(CONFIG_SMP) && defined(CONFIG_PCI)
>  static void __devinit verify_quirk_intel_irqbalance(struct pci_dev *dev)
>  {
> +	u8 config, rev;
> +	u32 word;
> +
> +	/* BIOS may enable hardware IRQ balancing for
> +	 * E7520/E7320/E7525(revision ID 0x9 and below)
> +	 * based platforms.
> +	 * For those platforms, make sure that the genapic is set to 'flat'
> +	 */
> +	pci_read_config_byte(dev, PCI_CLASS_REVISION, &rev);
> +	if (rev > 0x9)
> +		return;
> +
> +	/* enable access to config space*/
> +	pci_read_config_byte(dev, 0xf4, &config);
> +	pci_write_config_byte(dev, 0xf4, config|0x2);
> +
> +	/* read xTPR register */
> +	raw_pci_ops->read(0, 0, 0x40, 0x4c, 2, &word);
> +
> +	if (!(word & (1 << 13))) {
>  #ifdef CONFIG_X86_64
> -	if (genapic !=  &apic_flat)
> -		panic("APIC mode must be flat on this system\n");
> +		if (genapic !=  &apic_flat)
> +			panic("APIC mode must be flat on this system\n");
>  #elif defined(CONFIG_X86_GENERICARCH)
> -	if (genapic != &apic_default)
> -		panic("APIC mode must be default(flat) on this system. Use apic=default\n");
> +		if (genapic != &apic_default)
> +			panic("APIC mode must be default(flat) on this system. Use apic=default\n");
>  #endif
> +	}
> +
> +	/* put back the original value for config space*/
> +	if (!(config & 0x2))
> +		pci_write_config_byte(dev, 0xf4, config);
>  }
>  
>  void __init quirk_intel_irqbalance(void)

Yes, that boots.  Andi: you want me to send it to Mr T?
-
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