From: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
To: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Cc: Bjorn Helgaas <bhelgaas@google.com>,
Gerlando Falauto <gerlando.falauto@keymile.com>,
"linux-pci@vger.kernel.org" <linux-pci@vger.kernel.org>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>,
Andrew Lunn <andrew@lunn.ch>,
Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>,
Jason Cooper <jason@lakedaemon.net>,
"Longchamp, Valentin" <Valentin.Longchamp@keymile.com>,
Ezequiel Garcia <ezequiel.garcia@free-electrons.com>,
Lior Amsalem <alior@marvell.com>
Subject: Re: pci-mvebu driver on km_kirkwood
Date: Thu, 20 Feb 2014 17:32:27 -0700 [thread overview]
Message-ID: <20140221003227.GF19893@obsidianresearch.com> (raw)
In-Reply-To: <20140220212914.29ddc031@skate>
On Thu, Feb 20, 2014 at 09:29:14PM +0100, Thomas Petazzoni wrote:
> In practice, the story is a little bit more subtle than that: the PCIe
> driver may want to decide to either tell the PCI core to enlarge the
> window BAR up to the next power of two size, or to dedicate two windows
> to it.
That is a smart, easy solution! Maybe that is the least invasive way
to proceed for now?
I have no idea how you decide when to round up and when to allocate
more windows, that feels like a fairly complex optimization problem!
Alternatively, I suspect you can use the PCI quirk mechanism to alter
the resource sizing on a bridge?
> Jason, would you mind maybe replying to Bjorn Helgaas email (Thu, 20
> Feb 2014 12:18:42 -0700) ? I believe that a lot of the misunderstanding
> between Bjorn and me is due to the fact that I don't use the correct
> PCI terminology to describe how the Marvell hardware works, and how the
> Marvell PCIe driver copes with it. I'm sure you would explain it in a
> way that would be more easily understood by someone very familiar with
> the PCI terminology such as Bjorn. Thanks a lot!
Done!
Hope it helps,
Jason
next prev parent reply other threads:[~2014-02-21 0:32 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <51DD88A4.1030506@keymile.com>
[not found] ` <20130710185706.72b124a4@skate>
[not found] ` <51DD9A8C.10608@keymile.com>
[not found] ` <20130711163220.2b3adf38@skate>
[not found] ` <53039894.10905@keymile.com>
[not found] ` <20140218212751.07c2aeb5@skate>
[not found] ` <53046D98.6020801@keymile.com>
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[not found] ` <53047BBB.6040108@keymile.com>
2014-02-19 13:37 ` pci-mvebu driver on km_kirkwood Thomas Petazzoni
2014-02-19 21:45 ` Bjorn Helgaas
2014-02-20 8:55 ` Thomas Petazzoni
2014-02-20 17:35 ` Jason Gunthorpe
2014-02-20 20:29 ` Thomas Petazzoni
2014-02-21 0:32 ` Jason Gunthorpe [this message]
2014-02-21 8:34 ` Thomas Petazzoni
2014-02-21 8:58 ` Gerlando Falauto
2014-02-21 9:12 ` Thomas Petazzoni
2014-02-21 9:16 ` Gerlando Falauto
2014-02-21 9:39 ` Thomas Petazzoni
2014-02-21 12:24 ` Gerlando Falauto
2014-02-21 13:47 ` Thomas Petazzoni
2014-02-21 15:05 ` Arnd Bergmann
2014-02-21 15:11 ` Thomas Petazzoni
2014-02-21 15:20 ` Arnd Bergmann
2014-02-21 15:37 ` Thomas Petazzoni
2014-02-21 16:39 ` Jason Gunthorpe
2014-02-21 17:05 ` Thomas Petazzoni
2014-02-21 17:31 ` Jason Gunthorpe
2014-02-21 18:05 ` Arnd Bergmann
2014-02-21 18:29 ` Gerlando Falauto
2014-02-21 18:18 ` Gerlando Falauto
2014-02-21 18:45 ` Thomas Petazzoni
2014-02-20 19:18 ` Bjorn Helgaas
2014-02-21 0:24 ` Jason Gunthorpe
2014-02-21 19:05 ` Bjorn Helgaas
2014-02-21 19:21 ` Thomas Petazzoni
2014-02-21 19:53 ` Benjamin Herrenschmidt
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