Description of problem:

I ran into this issue on IA64. When I tried to start X server, ati driver failed
with 
    (EE) MACH64(0): Unable to map mmio aperture. Argument list too long (7) .

By looking into this closer I found that the issue is caused by a call to
pci_device_map_range() when trying to map MMIO aperture.
        int err = pci_device_map_range(pVideo,
                                       MMIOBase,
                                       PageSize,
                                       mode, &pATI->pMMIO);

Here the PageSize, which is 16K on ia64, is passed as the size argument but the
size of the corresponding region in my ati card is only 4K.  
        Region 0: Memory at fa000000 (32-bit, non-prefetchable) [size=16M]
        Region 1: I/O ports at 5800 [size=256]
        Region 2: Memory at fbfd0000 (32-bit, non-prefetchable) [size=4K]
        Expansion ROM at fbfa0000 [disabled] [size=128K]

Then an E2BIG is returned when the pci_device_map_range() checks arguments and
the X server failed to start. I also do some investigation about why I didn't
run into this on F8. It turns out recently X server changed to use libpciaccess
instead of previous xf86* method. Previously xf86MapPciMem() is used to do the
map and somehow allow the map succeed. 

I saw this on IA64, but I image that other platform which has a 4k region2 ati
card and 16K page size would run into the same issue. I think the real region
size instead of PageSize would be passed to the MMIO map and unmap functions in
this case. I will attach a patch to do this. 

Version-Release number of selected component (if applicable):
xorg-x11-drv-ati-6.8.0-4.fc9.ia64.rpm

How reproducible:

Steps to Reproduce:
1.
2.
3.
  
Actual results:


Expected results:


Additional info: