Hello,
I am trying to outsmart the proprietary nvidia driver to get my own
driver to access to a memory region set up by the nvidia driver.
Strace tells me that the nividia userspace library is calling
mmap2(NULL, 1048576, PROT_READ|PROT_WRITE, MAP_SHARED, 5, 0x35375)
to get a userspace pointer to the kernel memory that I'm interested in.
Is there a way that my own kernel module can "reverse" this mmap call?
I.e. given the userspace pointer, how do I get access to the physical
location of the memory that has been mapped?
I know that the region is pinned and used as a DMA buffer for
communication with the GPU. I want my own device to do DMA transfers to
and from the same location.
Thanks,
-Nikolaus
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