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Add timeout to DRM cleanup 

This prevents a potential infinite loop preventing us from closing
properly.
This commit is contained in:
Scott Anderson 2017-09-23 16:32:25 +12:00
parent 8cbade355f
commit 459d138fa2
3 changed files with 46 additions and 27 deletions
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3
backend/drm/backend.c
View File

@ -26,6 +26,9 @@ static void wlr_drm_backend_destroy(struct wlr_backend *_backend) {
return;
}
struct wlr_drm_backend *backend = (struct wlr_drm_backend *)_backend;
wlr_drm_restore_outputs(backend);
for (size_t i = 0; backend->outputs && i < backend->outputs->length; ++i) {
struct wlr_drm_output *output = backend->outputs->items[i];
wlr_output_destroy(&output->output);

65
backend/drm/drm.c
View File

@ -4,6 +4,7 @@
#include <string.h>
#include <inttypes.h>
#include <errno.h>
#include <time.h>
#include <xf86drm.h>
#include <xf86drmMode.h>
#include <drm_mode.h>
@ -556,7 +557,7 @@ error_enc:
error_conn:
drmModeFreeConnector(conn);
error_output:
wlr_drm_output_cleanup(output, false);
wlr_drm_output_cleanup(output);
return false;
}
@ -703,7 +704,7 @@ static bool wlr_drm_output_move_cursor(struct wlr_output *_output,
static void wlr_drm_output_destroy(struct wlr_output *_output) {
struct wlr_drm_output *output = (struct wlr_drm_output *)_output;
wlr_drm_output_cleanup(output, true);
wlr_drm_output_cleanup(output);
free(output);
}
@ -852,7 +853,7 @@ void wlr_drm_scan_connectors(struct wlr_drm_backend *backend) {
conn->connection != DRM_MODE_CONNECTED) {
wlr_log(L_INFO, "'%s' disconnected", output->output.name);
wlr_drm_output_cleanup(output, false);
wlr_drm_output_cleanup(output);
}
drmModeFreeConnector(conn);
@ -868,7 +869,7 @@ void wlr_drm_scan_connectors(struct wlr_drm_backend *backend) {
struct wlr_drm_output *output = backend->outputs->items[i];
wlr_log(L_INFO, "'%s' disappeared", output->output.name);
wlr_drm_output_cleanup(output, false);
wlr_drm_output_cleanup(output);
drmModeFreeCrtc(output->old_crtc);
free(output);
@ -909,23 +910,46 @@ int wlr_drm_event(int fd, uint32_t mask, void *data) {
return 1;
}
static void restore_output(struct wlr_drm_output *output, int fd) {
// Wait for any pending pageflips to finish
while (output->pageflip_pending) {
wlr_drm_event(fd, 0, NULL);
void wlr_drm_restore_outputs(struct wlr_drm_backend *drm) {
uint64_t to_close = (1 << drm->outputs->length) - 1;
for (size_t i = 0; i < drm->outputs->length; ++i) {
struct wlr_drm_output *output = drm->outputs->items[i];
if (output->state == WLR_DRM_OUTPUT_CONNECTED) {
output->state = WLR_DRM_OUTPUT_CLEANUP;
}
}
drmModeCrtc *crtc = output->old_crtc;
if (!crtc) {
return;
time_t timeout = time(NULL) + 5;
while (to_close && time(NULL) < timeout) {
wlr_drm_event(drm->fd, 0, NULL);
for (size_t i = 0; i < drm->outputs->length; ++i) {
struct wlr_drm_output *output = drm->outputs->items[i];
if (!output->pageflip_pending) {
to_close &= ~(1 << i);
}
}
}
drmModeSetCrtc(fd, crtc->crtc_id, crtc->buffer_id, crtc->x, crtc->y,
&output->connector, 1, &crtc->mode);
drmModeFreeCrtc(crtc);
if (to_close) {
wlr_log(L_ERROR, "Timed out stopping output renderers");
}
for (size_t i = 0; i < drm->outputs->length; ++i) {
struct wlr_drm_output *output = drm->outputs->items[i];
drmModeCrtc *crtc = output->old_crtc;
if (!crtc) {
continue;
}
drmModeSetCrtc(drm->fd, crtc->crtc_id, crtc->buffer_id, crtc->x, crtc->y,
&output->connector, 1, &crtc->mode);
drmModeFreeCrtc(crtc);
}
}
void wlr_drm_output_cleanup(struct wlr_drm_output *output, bool restore) {
void wlr_drm_output_cleanup(struct wlr_drm_output *output) {
if (!output) {
return;
}
@ -936,12 +960,7 @@ void wlr_drm_output_cleanup(struct wlr_drm_output *output, bool restore) {
switch (output->state) {
case WLR_DRM_OUTPUT_CONNECTED:
output->state = WLR_DRM_OUTPUT_DISCONNECTED;
if (restore) {
restore_output(output, renderer->fd);
restore = false;
}
case WLR_DRM_OUTPUT_CLEANUP:;
struct wlr_drm_crtc *crtc = output->crtc;
for (int i = 0; i < 3; ++i) {
wlr_drm_plane_renderer_free(renderer, crtc->planes[i]);
@ -955,10 +974,6 @@ void wlr_drm_output_cleanup(struct wlr_drm_output *output, bool restore) {
output->possible_crtc = 0;
/* Fallthrough */
case WLR_DRM_OUTPUT_NEEDS_MODESET:
output->state = WLR_DRM_OUTPUT_DISCONNECTED;
if (restore) {
restore_output(output, renderer->fd);
}
wlr_log(L_INFO, "Emmiting destruction signal for '%s'",
output->output.name);
wl_signal_emit(&backend->backend.events.output_remove, &output->output);

5
include/backend/drm.h
View File

@ -127,6 +127,7 @@ struct wlr_drm_backend {
enum wlr_drm_output_state {
WLR_DRM_OUTPUT_DISCONNECTED,
WLR_DRM_OUTPUT_NEEDS_MODESET,
WLR_DRM_OUTPUT_CLEANUP,
WLR_DRM_OUTPUT_CONNECTED,
};
@ -176,8 +177,8 @@ struct wlr_drm_interface {
bool wlr_drm_check_features(struct wlr_drm_backend *drm);
bool wlr_drm_resources_init(struct wlr_drm_backend *drm);
void wlr_drm_resources_free(struct wlr_drm_backend *drm);
void wlr_drm_output_cleanup(struct wlr_drm_output *output, bool restore);
void wlr_drm_restore_outputs(struct wlr_drm_backend *drm);
void wlr_drm_output_cleanup(struct wlr_drm_output *output);
void wlr_drm_scan_connectors(struct wlr_drm_backend *state);
int wlr_drm_event(int fd, uint32_t mask, void *data);