DMA_POOL_CREATE(9) Memory Management in Linux DMA_POOL_CREATE(9)
NAME dma_pool_create - Creates a pool of consistent memory blocks, for dma.
SYNOPSIS struct dma_pool * dma_pool_create(const char * name, struct device * dev, size_t size, size_t align, size_t boundary);
ARGUMENTS name name of pool, for diagnostics
dev device that will be doing the DMA
size size of the blocks in this pool.
align alignment requirement for blocks; must be a power of two
boundary returned blocks won´t cross this power of two boundary
DESCRIPTION Returns a dma allocation pool with the requested characteristics, or null if one can´t be created. Given one of these pools, dma_pool_alloc may be used to allocate memory. Such memory will all have consistent DMA mappings, accessible by the device and its driver without using cache flushing primitives. The actual size of blocks allocated may be larger than requested because of alignment.
If boundary is nonzero, objects returned from dma_pool_alloc won´t cross that size boundary. This is useful for devices which have addressing restrictions on individual DMA transfers, such as not crossing boundaries of 4KBytes.
COPYRIGHT Kernel Hackers Manual 2.6. July 2015 DMA_POOL_CREATE(9)