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.