BLK_QUEUE_BOUNCE_LIM(9) Block Devices BLK_QUEUE_BOUNCE_LIM(9)
NAME blk_queue_bounce_limit - set bounce buffer limit for queue
SYNOPSIS void blk_queue_bounce_limit(struct request_queue * q, u64 dma_mask);
ARGUMENTS q the request queue for the device
dma_mask the maximum address the device can handle
DESCRIPTION Different hardware can have different requirements as to what pages it can do I/O directly to. A low level driver can call blk_queue_bounce_limit to have lower memory pages allocated as bounce buffers for doing I/O to pages residing above dma_mask.
COPYRIGHT Kernel Hackers Manual 2.6. September 2014 BLK_QUEUE_BOUNCE_LIM(9)