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drm: Document drm_cache interface

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Notice that this uncovers an issue with the kernel-doc handling of array
arguments, causing the first parameter of drm_clflush_pages() to not
show up in the rst-generated page.  A proposed fix is under review in
linux-doc: <http://www.spinics.net/lists/linux-doc/msg42544.html>

Changes since v1:
 - Add section to drm-mm.rst.
 - Fix kernel-doc style issues.
 - s/memory/kernel memory/.

Signed-off-by: Gabriel Krisman Bertazi <krisman@collabora.co.uk>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/20170109215649.6860-1-krisman@collabora.co.uk
This commit is contained in:
Gabriel Krisman Bertazi 2017-01-09 19:56:48 -02:00 committed by Daniel Vetter
parent 282d0a35c8
commit f0e36723a6
2 changed files with 29 additions and 0 deletions
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6
Documentation/gpu/drm-mm.rst
View File

@ -470,3 +470,9 @@ DRM MM Range Allocator Function References
.. kernel-doc:: include/drm/drm_mm.h
:internal:
DRM Cache Handling
==================
.. kernel-doc:: drivers/gpu/drm/drm_cache.c
:export:

23
drivers/gpu/drm/drm_cache.c
View File

@ -67,6 +67,14 @@ static void drm_cache_flush_clflush(struct page *pages[],
}
#endif
/**
* drm_clflush_pages - Flush dcache lines of a set of pages.
* @pages: List of pages to be flushed.
* @num_pages: Number of pages in the array.
*
* Flush every data cache line entry that points to an address belonging
* to a page in the array.
*/
void
drm_clflush_pages(struct page *pages[], unsigned long num_pages)
{
@ -101,6 +109,13 @@ drm_clflush_pages(struct page *pages[], unsigned long num_pages)
}
EXPORT_SYMBOL(drm_clflush_pages);
/**
* drm_clflush_sg - Flush dcache lines pointing to a scather-gather.
* @st: struct sg_table.
*
* Flush every data cache line entry that points to an address in the
* sg.
*/
void
drm_clflush_sg(struct sg_table *st)
{
@ -125,6 +140,14 @@ drm_clflush_sg(struct sg_table *st)
}
EXPORT_SYMBOL(drm_clflush_sg);
/**
* drm_clflush_virt_range - Flush dcache lines of a region
* @addr: Initial kernel memory address.
* @length: Region size.
*
* Flush every data cache line entry that points to an address in the
* region requested.
*/
void
drm_clflush_virt_range(void *addr, unsigned long length)
{