From: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
To: Arnd Bergmann <arnd@arndb.de>
Cc: linux-arm-kernel@lists.infradead.org,
Liviu Dudau <liviu@dudau.co.uk>,
"linux-pci@vger.kernel.org" <linux-pci@vger.kernel.org>,
Will Deacon <will.deacon@arm.com>,
Russell King <rmk@arm.linux.org.uk>,
Kumar Gala <galak@codeaurora.org>,
"bhelgaas@google.com" <bhelgaas@google.com>
Subject: Re: [PATCH v2 3/3] PCI: ARM: add support for generic PCI host controller
Date: Tue, 18 Feb 2014 11:45:42 -0700 [thread overview]
Message-ID: <20140218184542.GA22004@obsidianresearch.com> (raw)
In-Reply-To: <1663692.UxtD9eTEBL@wuerfel>
On Tue, Feb 18, 2014 at 07:25:35PM +0100, Arnd Bergmann wrote:
> Apple have also used the same trick on their G5 Macs, presumably
> to simplify things for OS9 and OS-X, but even at the time making
> it harder for Linux.
I actually think some x86's have done the same thing, however the
firmware hides all that from the OS and the OS just sees a normal PCI
environment. So if we can't hide the mess in firmware, the next best
place is in drivers?
> Do we even need stable domain numbers? If we do, aliases sound fine.
> A more complex method would be to sort them by MMIO window address
> or perhaps by phandle.
PCI ordering has been a bane in the past on x86, so I think stable
domain numbers is certainly desirable. Particularly since the domain
number may be influenced by module load order :( Alises followed by
sorting by phandle sounds great to me.
Jason
WARNING: multiple messages have this Message-ID (diff)
From: jgunthorpe@obsidianresearch.com (Jason Gunthorpe)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH v2 3/3] PCI: ARM: add support for generic PCI host controller
Date: Tue, 18 Feb 2014 11:45:42 -0700 [thread overview]
Message-ID: <20140218184542.GA22004@obsidianresearch.com> (raw)
In-Reply-To: <1663692.UxtD9eTEBL@wuerfel>
On Tue, Feb 18, 2014 at 07:25:35PM +0100, Arnd Bergmann wrote:
> Apple have also used the same trick on their G5 Macs, presumably
> to simplify things for OS9 and OS-X, but even at the time making
> it harder for Linux.
I actually think some x86's have done the same thing, however the
firmware hides all that from the OS and the OS just sees a normal PCI
environment. So if we can't hide the mess in firmware, the next best
place is in drivers?
> Do we even need stable domain numbers? If we do, aliases sound fine.
> A more complex method would be to sort them by MMIO window address
> or perhaps by phandle.
PCI ordering has been a bane in the past on x86, so I think stable
domain numbers is certainly desirable. Particularly since the domain
number may be influenced by module load order :( Alises followed by
sorting by phandle sounds great to me.
Jason
next prev parent reply other threads:[~2014-02-18 18:45 UTC|newest]
Thread overview: 105+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-02-12 20:16 [PATCH v2 0/3] ARM: PCI: implement generic PCI host controller Will Deacon
2014-02-12 20:16 ` Will Deacon
2014-02-12 20:16 ` [PATCH v2 1/3] ARM: mach-virt: allow PCI support to be selected Will Deacon
2014-02-12 20:16 ` Will Deacon
2014-02-12 20:16 ` [PATCH v2 2/3] ARM: bios32: use pci_enable_resource to enable PCI resources Will Deacon
2014-02-12 20:16 ` Will Deacon
2014-02-12 22:28 ` Jason Gunthorpe
2014-02-12 22:28 ` Jason Gunthorpe
2014-02-13 10:06 ` Will Deacon
2014-02-13 10:06 ` Will Deacon
2014-02-13 12:22 ` Jingoo Han
2014-02-13 12:22 ` Jingoo Han
2014-02-12 20:16 ` [PATCH v2 3/3] PCI: ARM: add support for generic PCI host controller Will Deacon
2014-02-12 20:16 ` Will Deacon
2014-02-12 20:59 ` Arnd Bergmann
2014-02-12 20:59 ` Arnd Bergmann
2014-02-13 11:04 ` Will Deacon
2014-02-13 11:04 ` Will Deacon
2014-02-13 11:47 ` Arnd Bergmann
2014-02-13 11:47 ` Arnd Bergmann
2014-02-13 12:00 ` Will Deacon
2014-02-13 12:00 ` Will Deacon
2014-02-13 12:21 ` Arnd Bergmann
2014-02-13 12:21 ` Arnd Bergmann
2014-02-12 21:51 ` Kumar Gala
2014-02-12 21:51 ` Kumar Gala
2014-02-13 11:07 ` Will Deacon
2014-02-13 11:07 ` Will Deacon
2014-02-13 16:22 ` Kumar Gala
2014-02-13 16:22 ` Kumar Gala
2014-02-13 16:25 ` Will Deacon
2014-02-13 16:25 ` Will Deacon
2014-02-13 16:28 ` Arnd Bergmann
2014-02-13 16:28 ` Arnd Bergmann
2014-02-13 18:11 ` Mark Rutland
2014-02-13 18:11 ` Mark Rutland
2014-02-13 18:11 ` Mark Rutland
2014-02-13 18:26 ` Jason Gunthorpe
2014-02-13 18:26 ` Jason Gunthorpe
2014-02-13 19:53 ` Will Deacon
2014-02-13 19:53 ` Will Deacon
2014-02-13 20:20 ` Jason Gunthorpe
2014-02-13 20:20 ` Jason Gunthorpe
2014-02-14 9:59 ` Arnd Bergmann
2014-02-14 9:59 ` Arnd Bergmann
2014-02-14 22:00 ` Liviu Dudau
2014-02-14 22:00 ` Liviu Dudau
2014-02-15 13:03 ` Arnd Bergmann
2014-02-15 13:03 ` Arnd Bergmann
2014-02-18 17:41 ` Jason Gunthorpe
2014-02-18 17:41 ` Jason Gunthorpe
2014-02-18 18:25 ` Arnd Bergmann
2014-02-18 18:25 ` Arnd Bergmann
2014-02-18 18:45 ` Jason Gunthorpe [this message]
2014-02-18 18:45 ` Jason Gunthorpe
2014-02-18 19:13 ` Arnd Bergmann
2014-02-18 19:13 ` Arnd Bergmann
2014-02-19 2:44 ` Liviu Dudau
2014-02-19 2:44 ` Liviu Dudau
2014-02-19 6:48 ` Jason Gunthorpe
2014-02-19 6:48 ` Jason Gunthorpe
2014-02-19 10:24 ` Arnd Bergmann
2014-02-19 10:24 ` Arnd Bergmann
2014-02-19 11:37 ` Liviu Dudau
2014-02-19 11:37 ` Liviu Dudau
2014-02-19 13:26 ` Arnd Bergmann
2014-02-19 13:26 ` Arnd Bergmann
2014-02-19 15:30 ` Liviu Dudau
2014-02-19 15:30 ` Liviu Dudau
2014-02-19 19:47 ` Arnd Bergmann
2014-02-19 19:47 ` Arnd Bergmann
2014-02-19 0:28 ` Bjorn Helgaas
2014-02-19 0:28 ` Bjorn Helgaas
2014-02-19 9:58 ` Arnd Bergmann
2014-02-19 9:58 ` Arnd Bergmann
2014-02-19 18:20 ` Bjorn Helgaas
2014-02-19 18:20 ` Bjorn Helgaas
2014-02-19 19:06 ` Arnd Bergmann
2014-02-19 19:06 ` Arnd Bergmann
2014-02-19 20:18 ` Bjorn Helgaas
2014-02-19 20:18 ` Bjorn Helgaas
2014-02-19 20:48 ` Arnd Bergmann
2014-02-19 20:48 ` Arnd Bergmann
2014-02-19 21:10 ` Jason Gunthorpe
2014-02-19 21:10 ` Jason Gunthorpe
2014-02-19 21:33 ` Bjorn Helgaas
2014-02-19 21:33 ` Bjorn Helgaas
2014-02-19 22:12 ` Arnd Bergmann
2014-02-19 22:12 ` Arnd Bergmann
2014-02-19 22:18 ` Bjorn Helgaas
2014-02-19 22:18 ` Bjorn Helgaas
2014-02-13 19:52 ` Rob Herring
2014-02-13 19:52 ` Rob Herring
2014-02-13 18:06 ` Jason Gunthorpe
2014-02-13 18:06 ` Jason Gunthorpe
2014-02-13 19:51 ` Will Deacon
2014-02-13 19:51 ` Will Deacon
2014-02-13 18:26 ` [PATCH v2 0/3] ARM: PCI: implement " Jason Gunthorpe
2014-02-13 18:26 ` Jason Gunthorpe
2014-02-14 11:05 ` Arnd Bergmann
2014-02-14 11:05 ` Arnd Bergmann
2014-02-18 18:00 ` Jason Gunthorpe
2014-02-18 18:00 ` Jason Gunthorpe
2014-02-18 18:40 ` Arnd Bergmann
2014-02-18 18:40 ` Arnd Bergmann
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