centos man page for dma_pool_alloc

DMA_POOL_ALLOC(9)					    Memory Management in Linux						 DMA_POOL_ALLOC(9)

NAME
       dma_pool_alloc - get a block of consistent memory

SYNOPSIS
       void * dma_pool_alloc(struct dma_pool * pool, gfp_t mem_flags, dma_addr_t * handle);

ARGUMENTS
       pool
	   dma pool that will produce the block

       mem_flags
	   GFP_* bitmask

       handle
	   pointer to dma address of block

DESCRIPTION
       This returns the kernel virtual address of a currently unused block, and reports its dma address through the handle. If such a memory block
       can't be allocated, NULL is returned.

COPYRIGHT
Kernel Hackers Manual 3.10					     June 2014							 DMA_POOL_ALLOC(9)