On Fri, Aug 19, 2016 at 1:32 AM, wrote:
>
> Step 1: Figure out whether your driver is returning a physical or logical
> address for the CMA, and which of the two /dev/mem requires.
>
> Step 2: Take a look at the address returned and make sure it at least
> looks valid (is someplace the E820 map s
On Fri, 19 Aug 2016 00:19:47 +0800, Teoh Choon Zone said:
> I have a driver which will dma_alloc a CMA region and return the address to
> my user space program, the program then will mmap /dev/mem according to the
> address offset.
Step 1: Figure out whether your driver is returning a physical or
I have a driver which will dma_alloc a CMA region and return the address to
my user space program, the program then will mmap /dev/mem according to the
address offset. I was trying to vmsplice and splice it into my socket
buffer, but the vmsplice always return "bad address". Anybody knows why? I
at
