linux-kernel - Re: [PATCH] Revert "ARM: cns3xxx: pci: avoid potential stack overflow"

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Date:	Fri, 10 Jun 2016 12:10:14 +0200
From:	khalasa@...p.pl (Krzysztof Hałasa)
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Bjorn Helgaas <bhelgaas@...gle.com>, linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Revert "ARM: cns3xxx: pci: avoid potential stack overflow"

Arnd Bergmann <arnd@...db.de> writes:

> Before that, we were always setting both mrrs and mps. As we don't know
> who uses PCIE_BUS_PEER2PEER, maybe another option would be to add yet
> another pcie_bus_config value for this particular quirk?

It would be a safe approach.
Or, maybe another non-pcie_bus_config thing, I don't know (so
the pcie_bus_config is left for the user).

> I started the DT conversion a long time ago (see the DT parsing in
> arch/arm/mach-cns3xxx/core.c) but I never had any hardware to test
> on, and it was at a time when we didn't even have DT support in all
> the subsystems.
>
> I'd definitely help you get the rest of the DT support in place if
> you can test it. This is now the only SMP platform and one of
> the last users of GIC and l2x0 that does not use DT, so I'd love
> to see that converted just so we can remove the legacy probing from
> those drivers.

Ok. Is there a DT skeleton file somewhere, so I can try to boot the
board (without Laguna extras) in DT mode?
At first, I only need CPU + RAM + console serial port.

> Converting what we have in mainline should be fairly straightforward,
> but there is more code in 
> target/linux/cns3xxx/files/arch/arm/mach-cns3xxx/laguna.c that requires
> more work, in particular we need to come up with a way to handle
> the laguna_net_data and laguna_info structures, which have some of
> the same data that is normall in DT.

I assume adding this to U-Boot should be acceptable (for Gateworks,
too). They are already doing this to their i.MX6 line Ventana.

> Also, the gpio driver doesn't
> have a trivial conversion to DT and requires some work to define
> a binding and implement that.

GPIO is a bit less important ATM, since the boards can boot without it.
-- 
Krzysztof Halasa

Industrial Research Institute for Automation and Measurements PIAP
Al. Jerozolimskie 202, 02-486 Warsaw, Poland