From: Benjamin Herrenschmidt <benh@kernel•crashing.org>
To: Milton Miller <miltonm@bga•com>
Cc: Tony Luck <tony.luck@intel•com>,
Linus Torvalds <torvalds@linux-foundation•org>,
linuxppc-dev@lists•ozlabs.org,
lkml <linux-kernel@vger•kernel.org>,
Dominik Brodowski <linux@dominikbrodowski•net>,
Jesse Barnes <jbarnes@virtuousgeek•org>,
Greg Kroah-Hartmann <greg@kroah•com>,
Bjorn Helgaas <bhelgaas@google•com>,
Andrew Morton <akpm@linux-foundation•org>,
Yinghai Lu <yinghai@kernel•org>
Subject: Re: [PATCH 08/18] PCI, powerpc: Register busn_res for root buses
Date: Tue, 03 Apr 2012 07:22:47 +1000 [thread overview]
Message-ID: <1333401767.30734.58.camel@pasglop> (raw)
In-Reply-To: <powerpc-pci-domains-by-busnumber-resend@mdm.bga.com>
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.
prev parent reply other threads:[~2012-04-02 21:23 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1330395009-29260-1-git-send-email-yinghai@kernel.org>
2012-02-28 2:09 ` [PATCH 08/18] PCI, powerpc: Register busn_res for root buses Yinghai Lu
2012-02-28 5:36 ` Bjorn Helgaas
2012-02-28 8:54 ` Benjamin Herrenschmidt
2012-02-28 23:31 ` Bjorn Helgaas
2012-02-28 23:41 ` Benjamin Herrenschmidt
2012-04-02 9:58 ` Milton Miller
2012-04-02 10:19 ` Milton Miller
2012-04-02 21:22 ` Benjamin Herrenschmidt [this message]
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