Dear all,
I need to mmap vmallocated memory from a device driver to user
space. I implemented to vm_nopage method as described in the
Rubini book.
But at the address returned by the mmap call I see a different
memory location than in the driver. The memory is the same
as when I mmap /dev/mem for the same offset as the physical
address of my driver allocated buffer.
I also tried to call remap_page_range directly in the mmap
kernel interface (as e.g. /dev/mem does), but I get the same
result.
I'm using 2.2.14 on a DS20 Alpha box.
My address returned by vmalloc is 0xfffffe0000048000,
the physical address feeded to remap_page_range is
0x48000 (virt_to_phys returns that).
Scanning the whole 1st GB of memory mapped over /dev/mem
does not show the data patterns I stored in the
vmallocated area.
Can anybody help?
Thanks and best regards,
Martin Frey
-- Supercomputing Systems AG email: frey@scs.ch Martin Frey www: http://www.scs.ch/~frey Technoparkstrasse 1 phone: +41 (0)1 445 16 00 CH-8005 Zurich fax: +41 (0)1 445 16 10- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.rutgers.edu Please read the FAQ at http://www.tux.org/lkml/
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