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backend/session: add a timeout waiting for GPUs

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If a GPU doesn't show up in 10s, bail out and return zero GPUs.
This commit is contained in:
Simon Ser 2020-11-06 13:37:26 +01:00
parent c491a21d25
commit 754179dacd
1 changed files with 18 additions and 1 deletions
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19
backend/session/session.c
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@ -7,6 +7,7 @@
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#include <time.h>
#include <wayland-server-core.h>
#include <wlr/backend/session.h>
#include <wlr/backend/session/interface.h>
@ -17,6 +18,8 @@
#include "backend/session/session.h"
#include "util/signal.h"
#define WAIT_GPU_TIMEOUT 10000 // ms
extern const struct session_impl session_libseat;
extern const struct session_impl session_logind;
extern const struct session_impl session_direct;
@ -322,6 +325,12 @@ static struct udev_enumerate *enumerate_drm_cards(struct udev *udev) {
return en;
}
static uint64_t get_current_time_ms(void) {
struct timespec ts = {0};
clock_gettime(CLOCK_MONOTONIC, &ts);
return (uint64_t)ts.tv_sec * 1000 + (uint64_t)ts.tv_nsec / 1000000;
}
struct find_gpus_add_handler {
bool added;
struct wl_listener listener;
@ -356,16 +365,24 @@ size_t wlr_session_find_gpus(struct wlr_session *session,
handler.listener.notify = find_gpus_handle_add;
wl_signal_add(&session->events.add_drm_card, &handler.listener);
uint64_t started_at = get_current_time_ms();
uint64_t timeout = WAIT_GPU_TIMEOUT;
struct wl_event_loop *event_loop =
wl_display_get_event_loop(session->display);
while (!handler.added) {
int ret = wl_event_loop_dispatch(event_loop, -1);
int ret = wl_event_loop_dispatch(event_loop, (int)timeout);
if (ret < 0) {
wlr_log_errno(WLR_ERROR, "Failed to wait for DRM card device: "
"wl_event_loop_dispatch failed");
udev_enumerate_unref(en);
return -1;
}
uint64_t now = get_current_time_ms();
if (now >= started_at + WAIT_GPU_TIMEOUT) {
break;
}
timeout = started_at + WAIT_GPU_TIMEOUT - now;
}
wl_list_remove(&handler.listener.link);