linux-kernel - Re: [PATCH 08/18] PCI, powerpc: Register busn

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Date:	Tue, 03 Apr 2012 07:22:47 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Milton Miller <miltonm@....com>
Cc:	Bjorn Helgaas <bhelgaas@...gle.com>,
	Yinghai Lu <yinghai@...nel.org>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Tony Luck <tony.luck@...el.com>,
	Dominik Brodowski <linux@...inikbrodowski.net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Greg Kroah-Hartmann <greg@...ah.com>,
	lkml <linux-kernel@...r.kernel.org>,
	linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH 08/18] PCI, powerpc: Register busn_res for root buses

On Mon, 2012-04-02 at 05:19 -0500, Milton Miller wrote:
> 
> In the POWER3 era we had several boxes that split the pci bus number
> space across domains and RTAS used the bus number to find the correct
> PHB.   This contineed to the first RS64 boxes.  By S80 and RS64-III
> it was obvious that we didn't have enough numbers to continue this
> ilusion and we added the presently used RTAS calls that take the pci
> domain as well as bus, device, and function numbers.
> 
> The bus numbers split across pci domains started with the F50
> F50 chrp 32 bit platforms. 

Ok, so old CHRPs would have a split as well...

I think the best is to honor the bus-range property of the PHB as min &
max values, and if we feel a need to allow the kernel to assign busses
beyond that, we can always quirk the appropriate platform code.

Cheers,
Ben.


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