linux-kernel - Re: allocation failed: out of vmalloc space - use vmalloc=<size> to increase size.

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Message-Id: <1181676094.8164.26.camel@microwave.infinitevideocorporation.com>
Date:	Tue, 12 Jun 2007 15:21:29 -0400
From:	Jon Dufresne <jon.dufresne@...initevideocorporation.com>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Daniel J Blueman <daniel.blueman@...il.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: allocation failed: out of vmalloc space - use vmalloc=<size>
	to increase size.

I wasn't completely honest. It is one bar that has 512 MB, however it is
being mapped at 4 128 MB chunks. However, I would like them all mapped
at once through the lifetime of the driver.

Is there still no chance?

Thanks,
Jon

On Tue, 2007-06-12 at 11:08 -0700, H. Peter Anvin wrote:
> Daniel J Blueman wrote:
> > On 12 Jun, 14:30, Jon Dufresne
> > <jon.dufresne@...initevideocorporation.com> wrote:
> >> I am writing a linux kernel driver for a custom pci device. I am
> >> developing against the stock fedora 6 kernel on an x86. This device has
> >> 512 MB of IO memory reserved by BAR 3. Whenever I try to ioremap this
> >> space I get the error:
> 
> You don't have a prayer mapping 512 MB at once on an x86-32 machine.
> The kernel only has 1 GB of address space *total*.  You either need to
> map it in chunks or restrict yourself to 64-bit machines.
> 
> >> allocation failed: out of vmalloc space - use vmalloc=<size> to increase
> >> size.
> >>
> >> I think I understand why this is happening. I obviously don't have
> >> enough vmalloc space to map such a large chunk of memory. I have been
> >> using Corbet's et el's "Linux Device Drivers", Love's "Linux Kernel
> >> Development", and many websites as a guide in this development process
> >> but have yet to come across information that will help me.
> >>
> >> I'm curious if there is a way around this issue. Or a better way of
> >> handling it so that I can properly map the entire io memory space.
> 
> No chance.
> 
> > You can boot with kernel parameter vmalloc=384M or so. I have
> > experienced problems with booting with other values, but YMMV.
> 
> The vmalloc= option conflicts with the booting protocol, so it's
> basically a crapshoot if it's going to work or not, at least if you're
> using an initrd, which pretty much everyone does hese days.
> 
> 	-hpa

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