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drm/vram-helpers: Add helpers for prepare_fb() and cleanup_fb() 

The new helpers pin and unpin a framebuffer's GEM VRAM objects during
plane updates. This should be sufficient for most drivers' implementation
of prepare_fb() and cleanup_fb().

v2:
	* provide helpers for struct drm_simple_display_pipe_funcs
	* rename plane-helper funcs

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20191024081404.6978-2-tzimmermann@suse.de
This commit is contained in:
Thomas Zimmermann 2019-10-24 10:14:01 +02:00
parent 606be04724
commit 6542ad8918
2 changed files with 151 additions and 0 deletions
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126
drivers/gpu/drm/drm_gem_vram_helper.c
View File

@ -3,10 +3,13 @@
#include <drm/drm_debugfs.h>
#include <drm/drm_device.h>
#include <drm/drm_file.h>
#include <drm/drm_framebuffer.h>
#include <drm/drm_gem_ttm_helper.h>
#include <drm/drm_gem_vram_helper.h>
#include <drm/drm_mode.h>
#include <drm/drm_plane.h>
#include <drm/drm_prime.h>
#include <drm/drm_simple_kms_helper.h>
#include <drm/ttm/ttm_page_alloc.h>
static const struct drm_gem_object_funcs drm_gem_vram_object_funcs;
@ -646,6 +649,129 @@ int drm_gem_vram_driver_dumb_mmap_offset(struct drm_file *file,
}
EXPORT_SYMBOL(drm_gem_vram_driver_dumb_mmap_offset);
/*
* Helpers for struct drm_plane_helper_funcs
*/
/**
* drm_gem_vram_plane_helper_prepare_fb() - \
* Implements &struct drm_plane_helper_funcs.prepare_fb
* @plane: a DRM plane
* @new_state: the plane's new state
*
* During plane updates, this function pins the GEM VRAM
* objects of the plane's new framebuffer to VRAM. Call
* drm_gem_vram_plane_helper_cleanup_fb() to unpin them.
*
* Returns:
* 0 on success, or
* a negative errno code otherwise.
*/
int
drm_gem_vram_plane_helper_prepare_fb(struct drm_plane *plane,
struct drm_plane_state *new_state)
{
size_t i;
struct drm_gem_vram_object *gbo;
int ret;
if (!new_state->fb)
return 0;
for (i = 0; i < ARRAY_SIZE(new_state->fb->obj); ++i) {
if (!new_state->fb->obj[i])
continue;
gbo = drm_gem_vram_of_gem(new_state->fb->obj[i]);
ret = drm_gem_vram_pin(gbo, DRM_GEM_VRAM_PL_FLAG_VRAM);
if (ret)
goto err_drm_gem_vram_unpin;
}
return 0;
err_drm_gem_vram_unpin:
while (i) {
--i;
gbo = drm_gem_vram_of_gem(new_state->fb->obj[i]);
drm_gem_vram_unpin(gbo);
}
return ret;
}
EXPORT_SYMBOL(drm_gem_vram_plane_helper_prepare_fb);
/**
* drm_gem_vram_plane_helper_cleanup_fb() - \
* Implements &struct drm_plane_helper_funcs.cleanup_fb
* @plane: a DRM plane
* @old_state: the plane's old state
*
* During plane updates, this function unpins the GEM VRAM
* objects of the plane's old framebuffer from VRAM. Complements
* drm_gem_vram_plane_helper_prepare_fb().
*/
void
drm_gem_vram_plane_helper_cleanup_fb(struct drm_plane *plane,
struct drm_plane_state *old_state)
{
size_t i;
struct drm_gem_vram_object *gbo;
if (!old_state->fb)
return;
for (i = 0; i < ARRAY_SIZE(old_state->fb->obj); ++i) {
if (!old_state->fb->obj[i])
continue;
gbo = drm_gem_vram_of_gem(old_state->fb->obj[i]);
drm_gem_vram_unpin(gbo);
}
}
EXPORT_SYMBOL(drm_gem_vram_plane_helper_cleanup_fb);
/*
* Helpers for struct drm_simple_display_pipe_funcs
*/
/**
* drm_gem_vram_simple_display_pipe_prepare_fb() - \
* Implements &struct drm_simple_display_pipe_funcs.prepare_fb
* @pipe: a simple display pipe
* @new_state: the plane's new state
*
* During plane updates, this function pins the GEM VRAM
* objects of the plane's new framebuffer to VRAM. Call
* drm_gem_vram_simple_display_pipe_cleanup_fb() to unpin them.
*
* Returns:
* 0 on success, or
* a negative errno code otherwise.
*/
int drm_gem_vram_simple_display_pipe_prepare_fb(
struct drm_simple_display_pipe *pipe,
struct drm_plane_state *new_state)
{
return drm_gem_vram_plane_helper_prepare_fb(&pipe->plane, new_state);
}
EXPORT_SYMBOL(drm_gem_vram_simple_display_pipe_prepare_fb);
/**
* drm_gem_vram_simple_display_pipe_cleanup_fb() - \
* Implements &struct drm_simple_display_pipe_funcs.cleanup_fb
* @pipe: a simple display pipe
* @old_state: the plane's old state
*
* During plane updates, this function unpins the GEM VRAM
* objects of the plane's old framebuffer from VRAM. Complements
* drm_gem_vram_simple_display_pipe_prepare_fb().
*/
void drm_gem_vram_simple_display_pipe_cleanup_fb(
struct drm_simple_display_pipe *pipe,
struct drm_plane_state *old_state)
{
drm_gem_vram_plane_helper_cleanup_fb(&pipe->plane, old_state);
}
EXPORT_SYMBOL(drm_gem_vram_simple_display_pipe_cleanup_fb);
/*
* PRIME helpers
*/

25
include/drm/drm_gem_vram_helper.h
View File

@ -13,6 +13,9 @@
#include <linux/kernel.h> /* for container_of() */
struct drm_mode_create_dumb;
struct drm_plane;
struct drm_plane_state;
struct drm_simple_display_pipe;
struct drm_vram_mm_funcs;
struct filp;
struct vm_area_struct;
@ -124,6 +127,28 @@ int drm_gem_vram_driver_dumb_mmap_offset(struct drm_file *file,
struct drm_device *dev,
uint32_t handle, uint64_t *offset);
/*
* Helpers for struct drm_plane_helper_funcs
*/
int
drm_gem_vram_plane_helper_prepare_fb(struct drm_plane *plane,
struct drm_plane_state *new_state);
void
drm_gem_vram_plane_helper_cleanup_fb(struct drm_plane *plane,
struct drm_plane_state *old_state);
/*
* Helpers for struct drm_simple_display_pipe_funcs
*/
int drm_gem_vram_simple_display_pipe_prepare_fb(
struct drm_simple_display_pipe *pipe,
struct drm_plane_state *new_state);
void drm_gem_vram_simple_display_pipe_cleanup_fb(
struct drm_simple_display_pipe *pipe,
struct drm_plane_state *old_state);
/**
* define DRM_GEM_VRAM_DRIVER - default callback functions for \
&struct drm_driver