Medeiros Edward M NPRI wrote:
Hello,
I need to perform a "copy_to_user()" call in my PCI device driver. I
need to do this to make available the data acquired by my PCI device to
a user-space DSP routine. "copy_to_user()" has an input parameter
that is the address of the user-space buffer My question is how can I
pass this user-space buffer address to my PCI device driver?
Alternatively, if I get_user_pages in my device driver and allocate the
user-space buffer in my driver how can I pass this address to my
user-space DSP process?
Thank you!!
your PCI device driver implements the read() and write() function. It's
the way to get and put some data from you driver !
Or if the amount of data is too big, you can use a mmap function. It's
explained in ldd 2nd edition (I guess it's in the 3rd too) at the char
driver chapter I think.
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