linux-kernel - Re: [PATCH v8 2/4] fpga manager: add sysfs interface document

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Message-ID: <0440c296085f48918e07134b07690a08@BY2FFO11FD028.protection.gbl>
Date:	Thu, 19 Feb 2015 13:46:13 +0100
From:	Michal Simek <michal.simek@...inx.com>
To:	Pavel Machek <pavel@...x.de>, Rob Landley <rob@...dley.net>
CC:	Jason Gunthorpe <jgunthorpe@...idianresearch.com>,
	Pantelis Antoniou <pantelis.antoniou@...sulko.com>,
	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>,
	atull <atull@...nsource.altera.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	<hpa@...or.com>, Michal Simek <monstr@...str.eu>,
	Michal Simek <michal.simek@...inx.com>,
	Randy Dunlap <rdunlap@...radead.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	<devicetree@...r.kernel.org>, <robh+dt@...nel.org>,
	Grant Likely <grant.likely@...aro.org>, <iws@...o.caltech.edu>,
	<linux-doc@...r.kernel.org>, Mark Brown <broonie@...nel.org>,
	<philip@...ister.org>, <rubini@...dd.com>,
	Steffen Trumtrar <s.trumtrar@...gutronix.de>,
	<jason@...edaemon.net>, <kyle.teske@...com>, <nico@...aro.org>,
	Felipe Balbi <balbi@...com>, <m.chehab@...sung.com>,
	<davidb@...eaurora.org>, <davem@...emloft.net>,
	<cesarb@...arb.net>, <sameo@...ux.intel.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Walleij <linus.walleij@...aro.org>, <pawel.moll@....com>,
	<mark.rutland@....com>, <ijc+devicetree@...lion.org.uk>,
	<galak@...eaurora.org>, <devel@...verdev.osuosl.org>,
	Alan Tull <delicious.quinoa@...il.com>,
	<dinguyen@...nsource.altera.com>, <yvanderv@...nsource.altera.com>
Subject: Re: [PATCH v8 2/4] fpga manager: add sysfs interface document

On 02/17/2015 08:17 PM, Pavel Machek wrote:
> On Tue 2015-02-17 11:07:53, Rob Landley wrote:
>>
>>
>> On 02/15/2015 04:40 PM, Pavel Machek wrote:
>>> On Wed 2015-01-21 13:27:00, Jason Gunthorpe wrote:
>>>> On Wed, Jan 21, 2015 at 06:33:12PM +0200, Pantelis Antoniou wrote:
>>>> My point is that the current firmware layer is overly cautious and
>>>> FPGAs are very big. My current project on small Xilinx device has a
>>>> 10MB programming file. The biggest Xilinx device today has a max
>>>> bitfile size around 122MB.
>>>>
>>>> So keeping that much memory pinned in the kernel when I can prove it
>>>> is uncessary for my system (either because there is no suspend/resume
>>>> possibility, or because I know the CPU can always access the
>>>> filesytem) is very undesirable.
>>>
>>> Well, your current device aalso has 1GB RAM, no?
>>
>> Unnecessarily pinning 10% of your ram is a good solution?
> 
> Never said that. But I'd rather have _some_ API proposed, then try to
> design in everthing including kitchen sink and do nothing.

+1 on this.

Thanks,
Michal

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