Re: Regarding PCIe peek/poke in NetBSD

["Jonathan A. Kollasch" <jakllsch%kollasch.net@localhost>]

On Tue, Jan 04, 2011 at 01:45:24PM +0100, Manuel Bouyer wrote:
> On Tue, Jan 04, 2011 at 10:47:30AM +0530, Gnanasekar Loganathan wrote:
> > Hi Manuel,
> > 
> > The requirement was, one of my customer want to do read/write on any
> > address/offset from any PCIe devices present in the system. He don't
> > want to use the corresponding device drivers, need separate
> > application that can map the PCIe device region of any devices by bus
> > no, device no and function. The application meant for testing purpose
> > only.
> > 
> > Using the 'pcictl' utility i can able to do read/write operations on
> > PCIe configuration space, but not able to do in io/mem/prefetchable
> > space.  Able to map the region by 'bus_space_map', if the region was
> > not already mapped by the driver. bus_space_map fails if it was
> > already mapped.
> > 
> > Is there any way  to map the region which was already mapped by the driver?
> 
> Well, this is not so easy.
> For I/O space, I guess they can be acceeded using the i386_iopl(2) call
> (assuming you're on x86 hardware). For memory-mapped space, maybe
> they can be acceeded using /dev/mem, but I never tried this.

Also, you can mmap(4) /dev/pci now ...

        Jonathan Kollasch