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dma_buf_kmap_atomic(9) [centos man page]

DMA_BUF_KMAP_ATOMIC(9)					   Device drivers infrastructure				    DMA_BUF_KMAP_ATOMIC(9)

NAME
dma_buf_kmap_atomic - Map a page of the buffer object into kernel address space. The same restrictions as for kmap_atomic and friends apply. SYNOPSIS
void * dma_buf_kmap_atomic(struct dma_buf * dmabuf, unsigned long page_num); ARGUMENTS
dmabuf [in] buffer to map page from. page_num [in] page in PAGE_SIZE units to map. DESCRIPTION
This call must always succeed, any necessary preparations that might fail need to be done in begin_cpu_access. COPYRIGHT
Kernel Hackers Manual 3.10 June 2014 DMA_BUF_KMAP_ATOMIC(9)

Check Out this Related Man Page

bp_mapin(9F)						   Kernel Functions for Drivers 					      bp_mapin(9F)

NAME
bp_mapin - allocate virtual address space SYNOPSIS
#include <sys/types.h> #include <sys/buf.h> void bp_mapin(struct buf *bp); INTERFACE LEVEL
Architecture independent level 1 (DDI/DKI). PARAMETERS
bp Pointer to the buffer header structure. DESCRIPTION
bp_mapin() is used to map virtual address space to a page list maintained by the buffer header during a paged- I/O request. bp_mapin() allocates system virtual address space, maps that space to the page list, and returns the starting address of the space in the bp->b_un.b_addr field of the buf(9S) structure. Virtual address space is then deallocated using the bp_mapout(9F) function. If a null page list is encountered, bp_mapin() returns without allocating space and no mapping is performed. CONTEXT
bp_mapin() can be called from user and kernel contexts. SEE ALSO
bp_mapout(9F), buf(9S) Writing Device Drivers SunOS 5.11 13 Sep 1992 bp_mapin(9F)
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