Re: ioremap()/PCI sickness in 2.4.18-rc2

["Jeff V. Merkey" <jmerkey@vger.timpanogas.org>]

On Fri, Feb 22, 2002 at 12:49:10PM +0100, Steffen Persvold wrote:
> "Jeff V. Merkey" wrote:
> > 
> > On Wed, Feb 20, 2002 at 07:44:58PM +0100, Steffen Persvold wrote:
> > > On Wed, 20 Feb 2002, David S. Miller wrote:
> > >
> > > >    From: Jeff Garzik <jgarzik@mandrakesoft.com>
> > > >    Date: Wed, 20 Feb 2002 12:26:12 -0500
> > > >
> > > >    type abuse aside, and alpha bugs aside, this looks ok... what is the
> > > >    value of as->msize?
> > > >
> > > > Jeff and Jeff, the problem is one of two things:
> > > >
> > > > 1) when you have ~2GB of memory the vmalloc pool is very small
> > > >    and this it the same place ioremap allocations come from
> > > >
> > > > 2) the BIOS or Linus is not assigning resources of the device
> > > >    properly, or it simple can't because the available PCI MEM space
> > > >    with this much memory is too small
> > > >
> > > > I note that one of the resources of the card is 16MB or so.
> > >
> > > Hi guys,
> > >
> > > There is actually no need to have all three regions mapped at all times is
> > > there Jeff ? In the Scali ICM driver we actually doesn't ioremap() the
> > > prefetchable space at all because this is done with the mmap() method to
> > > the userspace clients. If you have a kernel space client though ioremap()
> > > is used, but only the parts of it that is needed (based on the number of
> > > nodes in the cluser and the shared memory size per node).
> > >
> > > Regards,
> > >
> > 
> > I am not using the adapters in user space, I am using them in kernel
> > space with a distributed RAID agent and file system.  This is a general
> > issue with Hugo's SISCI and IRM drivers and Linux.  They all need to work
> > in every configuration.  If it works with less than 1 GB is should work
> > with > 1GB of memory.
> > 
> > I am looking through get_vm_area() since this is where the bug is.  Your
> > Scali drivers are not the Dolphin released IRM/SISCI but custom drivers
> > you guys sell with **YOUR** software versions, and they are far from
> > general purpose.
> > 
> 
> Jeff,
> 
> I really don't think you're in a position to say wether the Scali driver is

Why don't you guys just support SISCI so there's not two driver
trees?  I have never seen your source code made public.  If it's
general then where can I download your code.  I also noticed your
implementation of the D335 drivers have some problems with our
applications.  

> general purpose or not, but in any case this issue is OT. My point is that it
> is not a good idea to keep the prefetchable area mapped at all times. The ICM
> driver also has kernel clients (e.g. a ethernet emulation driver) and they only
> ioremap() the areas which is needed based upon the number of nodes in the
> cluster they communicate with (and only a few Kbytes is mapped from each node). 
> 
> Regards,


Not everyone uses the same model you do for cluster membership. I am 
primarily concerned with keeping the same features/behaviors with 
the SISCI driver base.  It's the one I use.

Jeff

> -- 
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