linux-kernel - Re: [patch] fix 64-vbit prefetchable memory resource BARs

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Date:	Mon, 3 Nov 2008 14:42:10 -0600
From:	Bjorn Helgaas <bjorn.helgaas@...com>
To:	stable@...nel.org
Cc:	Peter Chubb <peterc@...ato.unsw.edu.au>, matthew@....cx,
	jbarnes@...tuousgeek.org, linux-kernel@...r.kernel.org,
	linux-pci@...r.kernel.org
Subject: Re: [patch] fix 64-vbit prefetchable memory resource BARs

On Sunday 12 October 2008 06:49:04 pm Peter Chubb wrote:
> Since patch 6ac665c63dcac8fcec534a1d224ecbb8b867ad59
> my infiniband controller hasn't worked.  This is because it has
> 64-bit prefetchable memory, which was mistakenly being  taken to be
> 32-bit memory.  The resource flags in this case are
> PCI_BASE_ADDRESS_MEM_TYPE_64|PCI_BASE_ADDRESS_MEM_PREFETCH.
> 
> This patch checks only for the PCI_BASE_ADDRESS_MEM_TYPE_64 bit; thus
> whether the region is prefetchable or not is ignored.  This fixes my
> Infiniband.

I think this patch needs to be put in a 2.6.27-stable release.

Without it, we ignore the upper bits of 64-bit prefetchable BARs.

This is commit e354597cce8d219d135d65e585dc4f30323486b9 in Linus's
tree.

http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=e354597cce8d219d135d65e585dc4f30323486b9

> Signed-off-by: Peter Chubb <peterc@...ato.unsw.edu.au>
> 
> Index: linux-2.6-git/drivers/pci/probe.c
> ===================================================================
> --- linux-2.6-git.orig/drivers/pci/probe.c	2008-10-13 10:49:46.012798465 +1100
> +++ linux-2.6-git/drivers/pci/probe.c	2008-10-13 11:35:43.016329442 +1100
> @@ -219,7 +219,7 @@
>  
>  	res->flags = bar & ~PCI_BASE_ADDRESS_MEM_MASK;
>  
> -	if (res->flags == PCI_BASE_ADDRESS_MEM_TYPE_64)
> +	if (res->flags & PCI_BASE_ADDRESS_MEM_TYPE_64)
>  		return pci_bar_mem64;
>  	return pci_bar_mem32;
>  }
> 
> 
> --
> Dr Peter Chubb  http://www.gelato.unsw.edu.au  peterc AT gelato.unsw.edu.au
> http://www.ertos.nicta.com.au           ERTOS within National ICT Australia
> --
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> 


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