Date: Thu, 10 Apr 2014 07:59:29 -0400
From: Jason Cooper <jason@lakedaemon.net>
To: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Cc: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>,
        Willy Tarreau <w@1wt.eu>, Neil Greatorex <neil@fatboyfat.co.uk>,
        linux-arm-kernel@lists.infradead.org,
        Matthew Minter <matthew_minter@xyratex.com>,
        linux-kernel@vger.kernel.org
Subject: Re: [PATCH v2] bus: mvebu-mbus: Avoid setting an undefined window
 size
Message-ID: <20140410115929.GB28159@titan.lakedaemon.net>
References: <1397000654-10849-1-git-send-email-jgunthorpe@obsidianresearch.com>
 <20140409061128.GC16465@1wt.eu>
 <20140409162040.GA19743@obsidianresearch.com>
 <20140410085346.784631f9@skate>
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On Thu, Apr 10, 2014 at 08:53:46AM +0200, Thomas Petazzoni wrote:
> Dear Jason Gunthorpe,
> 
> On Wed, 9 Apr 2014 10:20:40 -0600, Jason Gunthorpe wrote:
> 
> > > OK I just got it by adding two printk() in pci-mvebu.c. Both functions
> > > mvebu_pcie_handle_iobase_change() and mvebu_pcie_handle_membase_change()
> > > do pass a size which is in fact a mask (size - 1) and not the real size.
> > > So the mbus is fed with an incorrect size which is off by one :
> > 
> > Yes, that is right. I tested my patch here and didn't see any problem,
> > but I realize now that the mbus code is bailing early due to this:
> > 
> > kernel: mvebu_mbus: cannot add window '4:e8', conflicts with another window
> > 
> > Which I've never got around to fixing.. (whole other story there)
> > 
> > Your patch looks fine, and it obviously needs to be sequenced before
> > mine. (Thomas/Jason C: how do you want to do this?)
> 
> What I can propose is that I accumulate in a branch all the patches
> needed to solve the various PCIe/Mbus problems we've identified:
> 
>  * Your patch adding warnings to the mvebu-mbus driver
>  * Willy's patch fixing the off-by-one on the size
>  * Neil's patch fixing the MSI teardown function
>  * My two patches fixing the rest of the MSI logic
>  * And patches to come for the link problem, and the cutting of
>    non-power-of-two BARs into power-of-two windows
> 
> This way, everybody will be able to test than in his specific
> hardware situations, the patches are solving all the problems. Then I
> can take care of formally submitting those patches to the relevant
> maintainers, of course keeping the authorship as appropriate.
> 
> How does that sound?

Great!  Please do.

thx,

Jason.
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