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backend/drm: re-use FBs

Browse source 
Instead of importing buffers to GBM and KMS at each frame, cache them
and re-use them while the wlr_buffer is alive.

This is the same as [1] and [2] but for the DRM backend.

[1]: https://github.com/swaywm/wlroots/pull/2538
[2]: https://github.com/swaywm/wlroots/pull/2539
This commit is contained in:
Simon Ser 2020-12-22 18:42:59 +01:00
parent 91cb0fc443
commit d9bbc416a6
4 changed files with 56 additions and 15 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

6
backend/drm/backend.c
View file

@ -42,6 +42,11 @@ static void backend_destroy(struct wlr_backend *backend) {
wlr_signal_emit_safe(&backend->events.destroy, backend);
struct wlr_drm_fb *fb, *fb_tmp;
wl_list_for_each_safe(fb, fb_tmp, &drm->fbs, link) {
drm_fb_destroy(fb);
}
wl_list_remove(&drm->display_destroy.link);
wl_list_remove(&drm->session_destroy.link);
wl_list_remove(&drm->session_active.link);
@ -147,6 +152,7 @@ struct wlr_backend *wlr_drm_backend_create(struct wl_display *display,
wlr_backend_init(&drm->backend, &backend_impl);
drm->session = session;
wl_list_init(&drm->fbs);
wl_list_init(&drm->outputs);
drm->dev = dev;

59
backend/drm/renderer.c
View file

@ -297,15 +297,7 @@ void drm_fb_clear(struct wlr_drm_fb **fb_ptr) {
}
struct wlr_drm_fb *fb = *fb_ptr;
struct gbm_device *gbm = gbm_bo_get_device(fb->bo);
if (drmModeRmFB(gbm_device_get_fd(gbm), fb->id) != 0) {
wlr_log(WLR_ERROR, "drmModeRmFB failed");
}
gbm_bo_destroy(fb->bo);
wlr_buffer_unlock(fb->wlr_buf);
free(fb);
wlr_buffer_unlock(fb->wlr_buf); // may destroy the buffer
*fb_ptr = NULL;
}
@ -362,6 +354,12 @@ static struct gbm_bo *get_bo_for_dmabuf(struct gbm_device *gbm,
}
}
static void drm_fb_handle_wlr_buf_destroy(struct wl_listener *listener,
void *data) {
struct wlr_drm_fb *fb = wl_container_of(listener, fb, wlr_buf_destroy);
drm_fb_destroy(fb);
}
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_drm_fb *fb = calloc(1, sizeof(*fb));
@ -369,8 +367,6 @@ static struct wlr_drm_fb *drm_fb_create(struct wlr_drm_backend *drm,
return NULL;
}
fb->wlr_buf = wlr_buffer_lock(buf);
struct wlr_dmabuf_attributes attribs;
if (!wlr_buffer_get_dmabuf(buf, &attribs)) {
wlr_log(WLR_ERROR, "Failed to get DMA-BUF from buffer");
@ -403,16 +399,46 @@ static struct wlr_drm_fb *drm_fb_create(struct wlr_drm_backend *drm,
goto error_get_fb_for_bo;
}
fb->wlr_buf = buf;
fb->wlr_buf_destroy.notify = drm_fb_handle_wlr_buf_destroy;
wl_signal_add(&buf->events.destroy, &fb->wlr_buf_destroy);
wl_list_insert(&drm->fbs, &fb->link);
return fb;
error_get_fb_for_bo:
gbm_bo_destroy(fb->bo);
error_get_dmabuf:
wlr_buffer_unlock(fb->wlr_buf);
free(fb);
return NULL;
}
void drm_fb_destroy(struct wlr_drm_fb *fb) {
wl_list_remove(&fb->link);
wl_list_remove(&fb->wlr_buf_destroy.link);
struct gbm_device *gbm = gbm_bo_get_device(fb->bo);
if (drmModeRmFB(gbm_device_get_fd(gbm), fb->id) != 0) {
wlr_log(WLR_ERROR, "drmModeRmFB failed");
}
gbm_bo_destroy(fb->bo);
free(fb);
}
static struct wlr_drm_fb *drm_fb_get(struct wlr_drm_backend *drm,
struct wlr_buffer *local_buf) {
struct wlr_drm_fb *fb;
wl_list_for_each(fb, &drm->fbs, link) {
if (fb->wlr_buf == local_buf) {
return fb;
}
}
return NULL;
}
bool drm_fb_import(struct wlr_drm_fb **fb_ptr, struct wlr_drm_backend *drm,
struct wlr_buffer *buf, struct wlr_drm_surface *mgpu,
const struct wlr_drm_format_set *formats) {
@ -428,10 +454,13 @@ bool drm_fb_import(struct wlr_drm_fb **fb_ptr, struct wlr_drm_backend *drm,
local_buf = wlr_buffer_lock(buf);
}
struct wlr_drm_fb *fb = drm_fb_create(drm, local_buf, formats);
wlr_buffer_unlock(local_buf);
struct wlr_drm_fb *fb = drm_fb_get(drm, local_buf);
if (!fb) {
return false;
fb = drm_fb_create(drm, local_buf, formats);
if (!fb) {
wlr_buffer_unlock(local_buf);
return false;
}
}
drm_fb_move(fb_ptr, &fb);

1
include/backend/drm/drm.h
View file

@ -86,6 +86,7 @@ struct wlr_drm_backend {
struct wl_listener session_active;
struct wl_listener dev_change;
struct wl_list fbs; // wlr_drm_fb.link
struct wl_list outputs;
struct wlr_drm_renderer renderer;

5
include/backend/drm/renderer.h
View file

@ -31,8 +31,12 @@ struct wlr_drm_surface {
struct wlr_drm_fb {
struct wlr_buffer *wlr_buf;
struct wl_list link; // wlr_drm_backend.fbs
struct gbm_bo *bo;
uint32_t id;
struct wl_listener wlr_buf_destroy;
};
bool init_drm_renderer(struct wlr_drm_backend *drm,
@ -47,6 +51,7 @@ bool drm_fb_lock_surface(struct wlr_drm_fb **fb, struct wlr_drm_backend *drm,
bool drm_fb_import(struct wlr_drm_fb **fb, struct wlr_drm_backend *drm,
struct wlr_buffer *buf, struct wlr_drm_surface *mgpu,
const struct wlr_drm_format_set *formats);
void drm_fb_destroy(struct wlr_drm_fb *fb);
void drm_fb_clear(struct wlr_drm_fb **fb);
void drm_fb_move(struct wlr_drm_fb **new, struct wlr_drm_fb **old);