[openib-general] Re: mmap(/dev/mem) causing sigbus

[David S. Miller]

On Thu, 13 Jan 2005 15:12:14 -0800
Tom Duffy <tomduffy at dslextreme.com> wrote:

> It seems that there is an issue with either mmap or mmap'ing /dev/mem on
> sparc64.  A tool (mstflint) for flashing firmware for Mellanox
> Infiniband HCA's is crashing on sparc64.  It mmap's /dev/mem and when it
> accesses it, a bus error is generated.
> 
> Should this work?

It's not meant to be used at all.  We have abstracted out a way
to portably mmap() pci devices by opening /proc/bus/pci/* nodes,
running the appropriate ioctl() to choose I/O or MEM space,
then mmap()'ing on the fd to mmap the PCI device resources.

At the very least, i386 and ppc support this interface as well.