linux-kernel - Re: [PATCH V5 00/15] MMCONFIG refactoring and support for ARM64 PCI hostbridge init based on ACPI

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Message-ID: <20160304173750.GA15070@red-moon>
Date:	Fri, 4 Mar 2016 17:37:50 +0000
From:	Lorenzo Pieralisi <lorenzo.pieralisi@....com>
To:	Sinan Kaya <okaya@...eaurora.org>
Cc:	Tomasz Nowicki <tn@...ihalf.com>, helgaas@...nel.org,
	arnd@...db.de, will.deacon@....com, catalin.marinas@....com,
	rafael@...nel.org, hanjun.guo@...aro.org,
	jiang.liu@...ux.intel.com, jchandra@...adcom.com,
	Stefano.Stabellini@...citrix.com,
	robert.richter@...iumnetworks.com, mw@...ihalf.com,
	Liviu.Dudau@....com, ddaney@...iumnetworks.com,
	wangyijing@...wei.com, Suravee.Suthikulpanit@....com,
	msalter@...hat.com, linux-pci@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-acpi@...r.kernel.org,
	linux-kernel@...r.kernel.org, linaro-acpi@...ts.linaro.org,
	jcm@...hat.com, yinghai@...nel.org
Subject: Re: [PATCH V5 00/15] MMCONFIG refactoring and support for ARM64 PCI
 hostbridge init based on ACPI

On Fri, Mar 04, 2016 at 09:52:17AM -0500, Sinan Kaya wrote:

[...]

> >> I could integrate the code implementing pci=realloc in patch 11 so
> >> that we realloc by default all resources claimed that failed (which
> >> means that bridges are resized accordingly and you won't be forced
> >> to use pci=realloc on command line).
> >>
> > 
> > I agree with Lorenzo. Just because v3 works it does not mean we want to go this way. Also, I think we should realloc all resources claimed that failed, w/o need to use pci=realloc on command line.
> > 
> 
> Let's give this a try. I have seen the kernel messages with and
> without realloc option too. I don't want to see any kind of error
> messages if it is actually working.

I agree, claiming resources failures are too noisy, it is a pet-peeve
of mine too. The code to realloc resources is in the kernel already,
it is just a matter of defining how to use it (ie trigger it by default
without command line option - actually the kernel can be already
compiled to enable realloc by default, see CONFIG_PCI_REALLOC_ENABLE_AUTO),
that's why I added Yinghai to the thread, Bjorn and him have more
insights on how this has been used on current systems and I am really keen
on getting their opinion, they have more visibility into this than I do,
writing the patch itself should be simple enough.

Thanks !
Lorenzo