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

[Michael S. Tsirkin]

Hello!
Quoting r. David S. Miller (davem at davemloft.net) "Re: mmap(/dev/mem) causing sigbus":
> 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.

OK. I added an option for mmapping /proc/bus/pci, although
I dont have the time to test it today, but I checked in
disabled at compile time all the same.
Tom, please clear CONFIG_USE_DEV_MEM at the top of
mtcr.h and test, and let me know, this way I'll be
able to work on it on sunday.


mst