mmap() problem in own driver

Hi everyone
there is a problem of my own driver

I want to get data from kernel space to user space indirectly using mmap()
but i dont know how I can do , anyone can give me some advices ?

firstly, fetch data by DMA to a memory allocated by "kmalloc"
then i want to mmap it to user space and save the data as a file 

Cheers everyone~
Martin
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