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render/timeline: introduce wlr_timeline

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wlr_timeline is a synchronization primitive based on drm_syncobj
timelines. They are heavily inspired from Vulkan timeline
semaphores [1].

[1]: https://www.khronos.org/blog/vulkan-timeline-semaphores
This commit is contained in:
Simon Ser 2021-10-20 18:47:46 +02:00
parent 2a1d7d40f4
commit bfc616fc7e
3 changed files with 147 additions and 0 deletions
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86
render/timeline.c Normal file
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#include <xf86drm.h>
#include <stdlib.h>
#include <wlr/render/timeline.h>
#include <wlr/util/log.h>
struct wlr_render_timeline {
int drm_fd;
uint32_t handle;
};
struct wlr_render_timeline *wlr_render_timeline_create(int drm_fd) {
struct wlr_render_timeline *timeline = calloc(1, sizeof(*timeline));
if (timeline == NULL) {
return NULL;
}
timeline->drm_fd = drm_fd;
if (drmSyncobjCreate(drm_fd, 0, &timeline->handle) != 0) {
wlr_log_errno(WLR_ERROR, "drmSyncobjCreate failed");
free(timeline);
return NULL;
}
return timeline;
}
void wlr_render_timeline_destroy(struct wlr_render_timeline *timeline) {
drmSyncobjDestroy(timeline->drm_fd, timeline->handle);
free(timeline);
}
int wlr_render_timeline_export_sync_file(struct wlr_render_timeline *timeline,
uint64_t src_point) {
int sync_file_fd = -1;
uint32_t syncobj_handle;
if (drmSyncobjCreate(timeline->drm_fd, 0, &syncobj_handle) != 0) {
wlr_log_errno(WLR_ERROR, "drmSyncobjCreate failed");
return -1;
}
if (drmSyncobjTransfer(timeline->drm_fd, syncobj_handle, 0,
timeline->handle, src_point, 0) != 0) {
wlr_log_errno(WLR_ERROR, "drmSyncobjTransfer failed");
goto out;
}
if (drmSyncobjExportSyncFile(timeline->drm_fd,
syncobj_handle, &sync_file_fd) != 0) {
wlr_log_errno(WLR_ERROR, "drmSyncobjExportSyncFile failed");
goto out;
}
out:
drmSyncobjDestroy(timeline->drm_fd, syncobj_handle);
return sync_file_fd;
}
bool wlr_render_timeline_import_sync_file(struct wlr_render_timeline *timeline,
uint64_t dst_point, int sync_file_fd) {
bool ok = false;
uint32_t syncobj_handle;
if (drmSyncobjCreate(timeline->drm_fd, 0, &syncobj_handle) != 0) {
wlr_log_errno(WLR_ERROR, "drmSyncobjCreate failed");
return -1;
}
if (drmSyncobjImportSyncFile(timeline->drm_fd, syncobj_handle,
sync_file_fd) != 0) {
wlr_log_errno(WLR_ERROR, "drmSyncobjImportSyncFile failed");
goto out;
}
if (drmSyncobjTransfer(timeline->drm_fd, timeline->handle, dst_point,
syncobj_handle, 0, 0) != 0) {
wlr_log_errno(WLR_ERROR, "drmSyncobjTransfer failed");
goto out;
}
ok = true;
out:
drmSyncobjDestroy(timeline->drm_fd, syncobj_handle);
return ok;
}