On Mon, Dec 17, 2007 at 08:57:50AM +1100, Paul Mackerras wrote: > Greg KH writes: > > > Ok, sorry, it wasn't blindingly obvious that this was for pci sysfs > > devices that are mmaped, that makes a bit more sense. > > > > But I'd like to see what ioctl is wanted here first. > > I believe the ioctl would be to set whether the mapping goes to I/O or > memory space,
x86 cannot really access IO space through mmap so no that wasn't planned The main planned use was to get the translated bus address (after IOMMU) for a mapping and to set the caching modes. > So the alternative to the ioctl would be to have multiple files in > sysfs, one per combination of modes -- i.e., 4 files, or 3 if we > exclude the "I/O with write combining" mode, which would be > reasonable. At least for the IOMMU translation case that wouldn't work. -Andi -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/