blk_queue_bounce_limit (9) Linux Manual Page
blk_queue_bounce_limit – set bounce buffer limit for queue
Synopsis
void blk_queue_bounce_limit(struct request_queue *q, u64 max_addr);Arguments
q
-
- the request queue for the device
max_addr
- 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 max_addr.