On Wed, Mar 9, 2016 at 11:16 AM, Ran Shalit <ranshalit@gmail.com> wrote:

Hello,

I have some sample code which uses 2 test application: 1. test application in kernel , which allocates buffer using kmalloc (GFP_KERNEL) 2. test application in userspace which allocates buffer using malloc just to add that in the case (2) of userspace, the kernel driver use copy_from_user before dma transfer.

In both cases the buffers are DMA through PCI. I don't understand how is it that the buffers are allocated with malloc/kmalloc for DMA. Is there any idea ?

Regards, Ran