dma_pool_create (9) - Linux Man Pages

dma_pool_create: Creates a pool of consistent memory blocks, for dma.

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

CONTEXT

!in_interrupt

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.

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