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dma-buf: Update [un]map documentation to match the other functions 

Other function have inline documentation, a couple still have
theirs at the top of the structure, update the docs and move
them inline.

Signed-off-by: Andrew F. Davis <afd@ti.com>
Signed-off-by: Sumit Semwal <sumit.semwal@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20190321200957.16938-2-afd@ti.com
alistair/sunxi64-5.4-dsi
Andrew F. Davis 2019-03-21 15:09:57 -05:00 committed by Sumit Semwal
parent 67b886d290
commit d5ae7712b7
1 changed files with 25 additions and 4 deletions
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29
include/linux/dma-buf.h
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@ -39,8 +39,6 @@ struct dma_buf_attachment;
/**
* struct dma_buf_ops - operations possible on struct dma_buf
* @map: [optional] maps a page from the buffer into kernel address space.
* @unmap: [optional] unmaps a page from the buffer.
* @vmap: [optional] creates a virtual mapping for the buffer into kernel
* address space. Same restrictions as for vmap and friends apply.
* @vunmap: [optional] unmaps a vmap from the buffer
@ -200,8 +198,6 @@ struct dma_buf_ops {
* to be restarted.
*/
int (*end_cpu_access)(struct dma_buf *, enum dma_data_direction);
void *(*map)(struct dma_buf *, unsigned long);
void (*unmap)(struct dma_buf *, unsigned long, void *);
/**
* @mmap:
@ -240,6 +236,31 @@ struct dma_buf_ops {
*/
int (*mmap)(struct dma_buf *, struct vm_area_struct *vma);
/**
* @map:
*
* Maps a page from the buffer into kernel address space. The page is
* specified by offset into the buffer in PAGE_SIZE units.
*
* This callback is optional.
*
* Returns:
*
* Virtual address pointer where requested page can be accessed. NULL
* on error or when this function is unimplemented by the exporter.
*/
void *(*map)(struct dma_buf *, unsigned long);
/**
* @unmap:
*
* Unmaps a page from the buffer. Page offset and address pointer should
* be the same as the one passed to and returned by matching call to map.
*
* This callback is optional.
*/
void (*unmap)(struct dma_buf *, unsigned long, void *);
void *(*vmap)(struct dma_buf *);
void (*vunmap)(struct dma_buf *, void *vaddr);
};