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ikwzm / udmabuf

User space mappable dma buffer device driver for Linux.

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> I ran into the same issue on an x86_64 and it was fixed by changing the dma_mask_bit module parameter like so: `insmod udmabuf.ko dma_mask_bit=64 udmabuf0=8388608`

bipingamiyv opened this issue · comments

commented 
          > I ran into the same issue on an x86_64 and it was fixed by changing the dma_mask_bit module parameter like so: `insmod udmabuf.ko dma_mask_bit=64 udmabuf0=8388608`

I tried the above command, but it fails to create size more than 4MiB. Can you suggest any other alternative?

Originally posted by @bipingamiyv in #25 (comment)

commented

Thank you for the issue

u-dma-buf uses linux kernel's dma_alloc_coherent() to allocate a buffer.
The buffer capacity that can be secured by dma_alloc_coherent() is determined by the architecture, Linux kernel version, build parameters, and boot parameters.
It's difficult to answer this question because I don't know what your system looks like.
I'm sorry I couldn't help you.