1BLK_QUEUE_BOUNCE_LIM(9)          Block Devices         BLK_QUEUE_BOUNCE_LIM(9)
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NAME

6       blk_queue_bounce_limit - set bounce buffer limit for queue
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SYNOPSIS

9       void blk_queue_bounce_limit(struct request_queue * q, u64 dma_mask);
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ARGUMENTS

12       q
13           the request queue for the device
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15       dma_mask
16           the maximum address the device can handle
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DESCRIPTION

19       Different hardware can have different requirements as to what pages it
20       can do I/O directly to. A low level driver can call
21       blk_queue_bounce_limit to have lower memory pages allocated as bounce
22       buffers for doing I/O to pages residing above dma_mask.
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25Kernel Hackers Manual 3.10         June 2019           BLK_QUEUE_BOUNCE_LIM(9)
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