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backend/drm: poison buffers which cannot be scanned out

Browse source 
Rather than repeatedly trying to import DMA-BUFs which cannot be
scanned out, mark the failed ones with a special "poison" marker.
Inspired from [1].

[1]: https://gitlab.freedesktop.org/wayland/weston/-/merge_requests/731
This commit is contained in:
Simon Ser 2021-11-26 22:46:10 +01:00 committed by Simon Zeni
parent bff5b2c559
commit fbaefd90fc
1 changed files with 45 additions and 8 deletions
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53
backend/drm/renderer.c
View file

@ -275,20 +275,56 @@ static void close_all_bo_handles(struct wlr_drm_backend *drm,
}
}
static void drm_poisoned_fb_handle_destroy(struct wlr_addon *addon) {
wlr_addon_finish(addon);
free(addon);
}
static const struct wlr_addon_interface poisoned_fb_addon_impl = {
.name = "wlr_drm_poisoned_fb",
.destroy = drm_poisoned_fb_handle_destroy,
};
static bool is_buffer_poisoned(struct wlr_drm_backend *drm,
struct wlr_buffer *buf) {
return wlr_addon_find(&buf->addons, drm, &poisoned_fb_addon_impl) != NULL;
}
/**
* Mark the buffer as "poisoned", ie. it cannot be imported into KMS. This
* allows us to avoid repeatedly trying to import it when it's not
* scanout-capable.
*/
static void poison_buffer(struct wlr_drm_backend *drm,
struct wlr_buffer *buf) {
struct wlr_addon *addon = calloc(1, sizeof(*addon));
if (addon == NULL) {
wlr_log_errno(WLR_ERROR, "Allocation failed");
return;
}
wlr_addon_init(addon, &buf->addons, drm, &poisoned_fb_addon_impl);
wlr_log(WLR_DEBUG, "Poisoning buffer");
}
static struct wlr_drm_fb *drm_fb_create(struct wlr_drm_backend *drm,
struct wlr_buffer *buf, const struct wlr_drm_format_set *formats) {
struct wlr_dmabuf_attributes attribs;
if (!wlr_buffer_get_dmabuf(buf, &attribs)) {
wlr_log(WLR_DEBUG, "Failed to get DMA-BUF from buffer");
return NULL;
}
if (is_buffer_poisoned(drm, buf)) {
wlr_log(WLR_DEBUG, "Buffer is poisoned");
return NULL;
}
struct wlr_drm_fb *fb = calloc(1, sizeof(*fb));
if (!fb) {
wlr_log_errno(WLR_ERROR, "Allocation failed");
return NULL;
}
struct wlr_dmabuf_attributes attribs;
if (!wlr_buffer_get_dmabuf(buf, &attribs)) {
wlr_log(WLR_DEBUG, "Failed to get DMA-BUF from buffer");
goto error_get_dmabuf;
}
if (formats && !wlr_drm_format_set_has(formats, attribs.format,
attribs.modifier)) {
// The format isn't supported by the plane. Try stripping the alpha
@ -302,7 +338,7 @@ static struct wlr_drm_fb *drm_fb_create(struct wlr_drm_backend *drm,
wlr_log(WLR_DEBUG, "Buffer format 0x%"PRIX32" with modifier "
"0x%"PRIX64" cannot be scanned out",
attribs.format, attribs.modifier);
goto error_get_dmabuf;
goto error_fb;
}
}
@ -318,6 +354,7 @@ static struct wlr_drm_fb *drm_fb_create(struct wlr_drm_backend *drm,
fb->id = get_fb_for_bo(drm, &attribs, handles);
if (!fb->id) {
wlr_log(WLR_DEBUG, "Failed to import BO in KMS");
poison_buffer(drm, buf);
goto error_bo_handle;
}
@ -333,7 +370,7 @@ static struct wlr_drm_fb *drm_fb_create(struct wlr_drm_backend *drm,
error_bo_handle:
close_all_bo_handles(drm, handles);
error_get_dmabuf:
error_fb:
free(fb);
return NULL;
}