linux-kernel - Re: [PATCH] PCI MSI: Yet another fix for MSI-X with NIU cards, v2

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Date:	Wed, 13 May 2009 12:43:49 -0600
From:	Matthew Wilcox <matthew@....cx>
To:	Hidetoshi Seto <seto.hidetoshi@...fujitsu.com>
Cc:	Jesse Barnes <jbarnes@...tuousgeek.org>,
	"David S. Miller" <davem@...emloft.net>, linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] PCI MSI: Yet another fix for MSI-X with NIU cards, v2

On Wed, May 13, 2009 at 02:06:30PM +0900, Hidetoshi Seto wrote:
>  		entry->mask_base = base;
> -		entry->masked = readl(base + j * PCI_MSIX_ENTRY_SIZE +
> -					PCI_MSIX_ENTRY_VECTOR_CTRL_OFFSET);
> -		msix_mask_irq(entry, 1);
> +		entry->masked = 1;
>  

Why do you add the setting of entry->masked here?

>  
> +	/*
> +	 * The states of Reserved bits[31:01] of Vector Control for MSI-X
> +	 * Table Entries must be 0.  However, for potential future use,
> +	 * software must preserve the value of these reserved bits.
> +	 * Refer PCI spec 3.0, 6.8.2.9.
> +	 *
> +	 * Note that there are some device that refuses access to MSI-X
> +	 * Table Entries before MSI-X is enabled.  Therefore we do it here. 
> +	 */

I think you need to refer to PCIe 2.1 (or an ECN incorporated into it).
Some of these bits are now used.

> +	list_for_each_entry(entry, &dev->msi_list, list) {
> +		int vector = entry->msi_attrib.entry_nr;
> +		entry->masked = readl(base + vector * PCI_MSIX_ENTRY_SIZE +
> +					PCI_MSIX_ENTRY_VECTOR_CTRL_OFFSET);
> +		/* Make sure it is masked */
> +		msix_mask_irq(entry, 1);
> +	}
> +
>  	return 0;

This looks to be the same as the replacement patch I sent earlier.

-- 
Matthew Wilcox				Intel Open Source Technology Centre
"Bill, look, we understand that you're interested in selling us this
operating system, but compare it to ours.  We can't possibly take such
a retrograde step."
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