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backend/drm: add explicit sync support to multi-GPU blits

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This commit is contained in:
Simon Ser 2024-08-05 19:12:53 +02:00
parent 3187479c07
commit d7223eae02
5 changed files with 60 additions and 10 deletions
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6
backend/drm/atomic.c
View File

@ -275,9 +275,9 @@ bool drm_atomic_connector_prepare(struct wlr_drm_connector_state *state, bool mo
}
int in_fence_fd = -1;
if (state->base->committed & WLR_OUTPUT_STATE_WAIT_TIMELINE) {
in_fence_fd = wlr_drm_syncobj_timeline_export_sync_file(state->base->wait_timeline,
state->base->wait_point);
if (state->wait_timeline != NULL) {
in_fence_fd = wlr_drm_syncobj_timeline_export_sync_file(state->wait_timeline,
state->wait_point);
if (in_fence_fd < 0) {
return false;
}

31
backend/drm/drm.c
View File

@ -14,6 +14,7 @@
#include <wayland-util.h>
#include <wlr/backend/interface.h>
#include <wlr/interfaces/wlr_output.h>
#include <wlr/render/drm_syncobj.h>
#include <wlr/render/wlr_renderer.h>
#include <wlr/util/box.h>
#include <wlr/util/log.h>
@ -693,6 +694,7 @@ static void drm_connector_state_init(struct wlr_drm_connector_state *state,
static void drm_connector_state_finish(struct wlr_drm_connector_state *state) {
drm_fb_clear(&state->primary_fb);
drm_fb_clear(&state->cursor_fb);
wlr_drm_syncobj_timeline_unref(state->wait_timeline);
}
static bool drm_connector_state_update_primary_fb(struct wlr_drm_connector *conn,
@ -707,6 +709,14 @@ static bool drm_connector_state_update_primary_fb(struct wlr_drm_connector *conn
struct wlr_drm_plane *plane = crtc->primary;
struct wlr_buffer *source_buf = state->base->buffer;
struct wlr_drm_syncobj_timeline *wait_timeline = NULL;
uint64_t wait_point = 0;
if (state->base->committed & WLR_OUTPUT_STATE_WAIT_TIMELINE) {
wait_timeline = state->base->wait_timeline;
wait_point = state->base->wait_point;
}
assert(state->wait_timeline == NULL);
struct wlr_buffer *local_buf;
if (drm->parent) {
struct wlr_drm_format format = {0};
@ -723,12 +733,23 @@ static bool drm_connector_state_update_primary_fb(struct wlr_drm_connector *conn
return false;
}
local_buf = drm_surface_blit(&plane->mgpu_surf, source_buf);
local_buf = drm_surface_blit(&plane->mgpu_surf, source_buf,
wait_timeline, wait_point);
if (local_buf == NULL) {
return false;
}
if (plane->mgpu_surf.timeline != NULL) {
state->wait_timeline = wlr_drm_syncobj_timeline_ref(plane->mgpu_surf.timeline);
state->wait_point = plane->mgpu_surf.point;
}
} else {
local_buf = wlr_buffer_lock(source_buf);
if (wait_timeline != NULL) {
state->wait_timeline = wlr_drm_syncobj_timeline_ref(wait_timeline);
state->wait_point = wait_point;
}
}
bool ok = drm_fb_import(&state->primary_fb, drm, local_buf,
@ -1088,7 +1109,7 @@ static bool drm_connector_set_cursor(struct wlr_output *output,
return false;
}
local_buf = drm_surface_blit(&plane->mgpu_surf, buffer);
local_buf = drm_surface_blit(&plane->mgpu_surf, buffer, NULL, 0);
if (local_buf == NULL) {
return false;
}
@ -1625,9 +1646,11 @@ static bool connect_drm_connector(struct wlr_drm_connector *wlr_conn,
output->non_desktop = non_desktop;
}
// TODO: support sync timelines in multi-GPU mode
// TODO: support sync timelines with libliftoff
output->timeline = drm->parent == NULL && drm->iface == &atomic_iface;
output->timeline = drm->iface == &atomic_iface;
if (drm->parent) {
output->timeline = output->timeline && drm->mgpu_renderer.wlr_rend->features.timeline;
}
memset(wlr_conn->max_bpc_bounds, 0, sizeof(wlr_conn->max_bpc_bounds));
if (wlr_conn->props.max_bpc != 0) {

24
backend/drm/renderer.c
View File

@ -1,5 +1,6 @@
#include <assert.h>
#include <drm_fourcc.h>
#include <wlr/render/drm_syncobj.h>
#include <wlr/render/swapchain.h>
#include <wlr/render/wlr_renderer.h>
#include <wlr/util/log.h>
@ -46,6 +47,7 @@ void finish_drm_surface(struct wlr_drm_surface *surf) {
return;
}
wlr_drm_syncobj_timeline_unref(surf->timeline);
wlr_swapchain_destroy(surf->swapchain);
*surf = (struct wlr_drm_surface){0};
@ -68,13 +70,24 @@ bool init_drm_surface(struct wlr_drm_surface *surf,
return false;
}
int drm_fd = wlr_renderer_get_drm_fd(renderer->wlr_rend);
if (renderer->wlr_rend->features.timeline && drm_fd >= 0) {
surf->timeline = wlr_drm_syncobj_timeline_create(drm_fd);
if (surf->timeline == NULL) {
finish_drm_surface(surf);
wlr_log(WLR_ERROR, "Failed to create DRM syncobj timeline");
return false;
}
}
surf->renderer = renderer;
return true;
}
struct wlr_buffer *drm_surface_blit(struct wlr_drm_surface *surf,
struct wlr_buffer *buffer) {
struct wlr_buffer *buffer,
struct wlr_drm_syncobj_timeline *wait_timeline, uint64_t wait_point) {
struct wlr_renderer *renderer = surf->renderer->wlr_rend;
if (surf->swapchain->width != buffer->width ||
@ -95,7 +108,12 @@ struct wlr_buffer *drm_surface_blit(struct wlr_drm_surface *surf,
goto error_tex;
}
struct wlr_render_pass *pass = wlr_renderer_begin_buffer_pass(renderer, dst, NULL);
surf->point++;
const struct wlr_buffer_pass_options pass_options = {
.signal_timeline = surf->timeline,
.signal_point = surf->point,
};
struct wlr_render_pass *pass = wlr_renderer_begin_buffer_pass(renderer, dst, &pass_options);
if (pass == NULL) {
wlr_log(WLR_ERROR, "Failed to begin render pass with multi-GPU destination buffer");
goto error_dst;
@ -104,6 +122,8 @@ struct wlr_buffer *drm_surface_blit(struct wlr_drm_surface *surf,
wlr_render_pass_add_texture(pass, &(struct wlr_render_texture_options){
.texture = tex,
.blend_mode = WLR_RENDER_BLEND_MODE_NONE,
.wait_timeline = wait_timeline,
.wait_point = wait_point,
});
if (!wlr_render_pass_submit(pass)) {
wlr_log(WLR_ERROR, "Failed to submit multi-GPU render pass");

3
include/backend/drm/drm.h
View File

@ -141,6 +141,9 @@ struct wlr_drm_connector_state {
struct wlr_drm_fb *primary_fb;
struct wlr_drm_fb *cursor_fb;
struct wlr_drm_syncobj_timeline *wait_timeline;
uint64_t wait_point;
// used by atomic
uint32_t mode_id;
uint32_t gamma_lut;

6
include/backend/drm/renderer.h
View File

@ -20,6 +20,9 @@ struct wlr_drm_renderer {
struct wlr_drm_surface {
struct wlr_drm_renderer *renderer;
struct wlr_swapchain *swapchain;
struct wlr_drm_syncobj_timeline *timeline;
uint64_t point;
};
bool init_drm_renderer(struct wlr_drm_backend *drm,
@ -32,7 +35,8 @@ bool init_drm_surface(struct wlr_drm_surface *surf,
void finish_drm_surface(struct wlr_drm_surface *surf);
struct wlr_buffer *drm_surface_blit(struct wlr_drm_surface *surf,
struct wlr_buffer *buffer);
struct wlr_buffer *buffer,
struct wlr_drm_syncobj_timeline *wait_timeline, uint64_t wait_point);
bool drm_plane_pick_render_format(struct wlr_drm_plane *plane,
struct wlr_drm_format *fmt, struct wlr_drm_renderer *renderer);