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compositor-drm: Refcount drm_fb

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Sometimes we need to duplicate an existing drm_fb, e.g. when
pageflipping to the same buffer to kickstart the repaint loop. To handle
situations like these, and simplify resource management for dumb and
cursor buffers, refcount drm_fb.

drm_fb_get_from_bo has a path where it may reuse a drm_fb, if the BO has
been imported and not released yet. As drm_fb_unref now relies on actual
refcounting (backed up by asserts), we add a balancing drm_fb_ref() to
the path where we return a reused drm_fb.

Signed-off-by: Daniel Stone <daniels@collabora.com>
Reviewed-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
This commit is contained in:
Daniel Stone 2017-04-04 17:54:26 +01:00 • committed by Pekka Paalanen
parent 05a5ac2b8f
commit 6e7a961d43
1 changed files with 27 additions and 5 deletions
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32
libweston/compositor-drm.c
View file

@ -138,6 +138,8 @@ enum drm_fb_type {
struct drm_fb {
enum drm_fb_type type;
int refcnt;
uint32_t fb_id, stride, handle, size;
const struct pixel_format_info *format;
int width, height;
@ -378,6 +380,8 @@ drm_fb_create_dumb(struct drm_backend *b, int width, int height,
if (!fb)
return NULL;
fb->refcnt = 1;
fb->format = pixel_format_get_info(format);
if (!fb->format) {
weston_log("failed to look up format 0x%lx\n",
@ -460,6 +464,13 @@ err_fb:
return NULL;
}
static struct drm_fb *
drm_fb_ref(struct drm_fb *fb)
{
fb->refcnt++;
return fb;
}
static struct drm_fb *
drm_fb_get_from_bo(struct gbm_bo *bo, struct drm_backend *backend,
uint32_t format, enum drm_fb_type type)
@ -470,7 +481,7 @@ drm_fb_get_from_bo(struct gbm_bo *bo, struct drm_backend *backend,
if (fb) {
assert(fb->type == type);
return fb;
return drm_fb_ref(fb);
}
fb = zalloc(sizeof *fb);
@ -478,6 +489,7 @@ drm_fb_get_from_bo(struct gbm_bo *bo, struct drm_backend *backend,
return NULL;
fb->type = type;
fb->refcnt = 1;
fb->bo = bo;
fb->width = gbm_bo_get_width(bo);
@ -552,9 +564,13 @@ drm_fb_unref(struct drm_fb *fb)
if (!fb)
return;
assert(fb->refcnt > 0);
if (--fb->refcnt > 0)
return;
switch (fb->type) {
case BUFFER_PIXMAN_DUMB:
/* nothing: pixman buffers are destroyed manually */
drm_fb_destroy_dumb(fb);
break;
case BUFFER_CLIENT:
gbm_bo_destroy(fb->bo);
@ -715,7 +731,7 @@ drm_output_render_pixman(struct drm_output *output, pixman_region32_t *damage)
output->current_image ^= 1;
output->next = output->dumb[output->current_image];
output->next = drm_fb_ref(output->dumb[output->current_image]);
pixman_renderer_output_set_buffer(&output->base,
output->image[output->current_image]);
@ -2060,7 +2076,7 @@ drm_output_init_pixman(struct drm_output *output, struct drm_backend *b)
err:
for (i = 0; i < ARRAY_LENGTH(output->dumb); i++) {
if (output->dumb[i])
drm_fb_destroy_dumb(output->dumb[i]);
drm_fb_unref(output->dumb[i]);
if (output->image[i])
pixman_image_unref(output->image[i]);
@ -2080,8 +2096,8 @@ drm_output_fini_pixman(struct drm_output *output)
pixman_region32_fini(&output->previous_damage);
for (i = 0; i < ARRAY_LENGTH(output->dumb); i++) {
drm_fb_destroy_dumb(output->dumb[i]);
pixman_image_unref(output->image[i]);
drm_fb_unref(output->dumb[i]);
output->dumb[i] = NULL;
output->image[i] = NULL;
}
@ -2570,6 +2586,12 @@ drm_output_deinit(struct weston_output *base)
struct drm_output *output = to_drm_output(base);
struct drm_backend *b = to_drm_backend(base->compositor);
/* output->next must not be set here;
* destroy_pending/disable_pending exist to guarantee exactly this. */
assert(!output->next);
drm_fb_unref(output->current);
output->current = NULL;
if (b->use_pixman)
drm_output_fini_pixman(output);
else