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drm/gem: Provide drm_gem_fb_{vmap,vunmap}()

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Move framebuffer vmap code from shadow-buffered plane state into the new
interfaces drm_gem_fb_vmap() and drm_gem_fb_vunmap(). These functions
provide mappings of a framebuffer's BOs into kernel address space. No
functional changes.

v4:
	* remove duplicated blank line
v2:
	* using [static N] for array parameters enables compile-time checks
	* include <drm/drm_fourcc.h> for DRM_FORMAT_MAX_PLANES (kernel
	  test robot)

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Sam Ravnborg <sam@ravnborg.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20210730183511.20080-3-tzimmermann@suse.de
This commit is contained in:
Thomas Zimmermann
2021-07-30 20:35:08 +02:00
parent 279cc2e954
commit f6424ecdb3
3 changed files with 80 additions and 33 deletions
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72
drivers/gpu/drm/drm_gem_framebuffer_helper.c
View File

@ -15,6 +15,8 @@
#include <drm/drm_gem_framebuffer_helper.h>
#include <drm/drm_modeset_helper.h>
#include "drm_internal.h"
#define AFBC_HEADER_SIZE 16
#define AFBC_TH_LAYOUT_ALIGNMENT 8
#define AFBC_HDR_ALIGN 64
@ -309,6 +311,76 @@ drm_gem_fb_create_with_dirty(struct drm_device *dev, struct drm_file *file,
}
EXPORT_SYMBOL_GPL(drm_gem_fb_create_with_dirty);
/**
* drm_gem_fb_vmap - maps all framebuffer BOs into kernel address space
* @fb: the framebuffer
* @map: returns the mapping's address for each BO
*
* This function maps all buffer objects of the given framebuffer into
* kernel address space and stores them in struct dma_buf_map. If the
* mapping operation fails for one of the BOs, the function unmaps the
* already established mappings automatically.
*
* See drm_gem_fb_vunmap() for unmapping.
*
* Returns:
* 0 on success, or a negative errno code otherwise.
*/
int drm_gem_fb_vmap(struct drm_framebuffer *fb,
struct dma_buf_map map[static DRM_FORMAT_MAX_PLANES])
{
struct drm_gem_object *obj;
unsigned int i;
int ret;
for (i = 0; i < DRM_FORMAT_MAX_PLANES; ++i) {
obj = drm_gem_fb_get_obj(fb, i);
if (!obj)
continue;
ret = drm_gem_vmap(obj, &map[i]);
if (ret)
goto err_drm_gem_vunmap;
}
return 0;
err_drm_gem_vunmap:
while (i) {
--i;
obj = drm_gem_fb_get_obj(fb, i);
if (!obj)
continue;
drm_gem_vunmap(obj, &map[i]);
}
return ret;
}
EXPORT_SYMBOL(drm_gem_fb_vmap);
/**
* drm_gem_fb_vunmap - unmaps framebuffer BOs from kernel address space
* @fb: the framebuffer
* @map: mapping addresses as returned by drm_gem_fb_vmap()
*
* This function unmaps all buffer objects of the given framebuffer.
*
* See drm_gem_fb_vmap() for more information.
*/
void drm_gem_fb_vunmap(struct drm_framebuffer *fb,
struct dma_buf_map map[static DRM_FORMAT_MAX_PLANES])
{
unsigned int i = DRM_FORMAT_MAX_PLANES;
struct drm_gem_object *obj;
while (i) {
--i;
obj = drm_gem_fb_get_obj(fb, i);
if (!obj)
continue;
drm_gem_vunmap(obj, &map[i]);
}
}
EXPORT_SYMBOL(drm_gem_fb_vunmap);
/**
* drm_gem_fb_begin_cpu_access - prepares GEM buffer objects for CPU access
* @fb: the framebuffer