| 1 | /* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only) |
| 2 | * |
| 3 | * lttng-event-notifier-notification.c |
| 4 | * |
| 5 | * Copyright (C) 2020 Francis Deslauriers <francis.deslauriers@efficios.com> |
| 6 | */ |
| 7 | |
| 8 | #include <lttng/events.h> |
| 9 | #include <lttng/event-notifier-notification.h> |
| 10 | |
| 11 | void lttng_event_notifier_notification_send(struct lttng_event_notifier *event_notifier) |
| 12 | { |
| 13 | struct lttng_event_notifier_group *event_notifier_group = event_notifier->group; |
| 14 | struct lib_ring_buffer_ctx ctx; |
| 15 | int ret; |
| 16 | |
| 17 | if (unlikely(!READ_ONCE(event_notifier->enabled))) |
| 18 | return; |
| 19 | |
| 20 | lib_ring_buffer_ctx_init(&ctx, event_notifier_group->chan, NULL, |
| 21 | sizeof(event_notifier->user_token), |
| 22 | lttng_alignof(event_notifier->user_token), -1); |
| 23 | ret = event_notifier_group->ops->event_reserve(&ctx, 0); |
| 24 | if (ret < 0) { |
| 25 | //TODO: error handling with counter maps |
| 26 | //silently drop for now. |
| 27 | WARN_ON_ONCE(1); |
| 28 | return; |
| 29 | } |
| 30 | lib_ring_buffer_align_ctx(&ctx, lttng_alignof(event_notifier->user_token)); |
| 31 | event_notifier_group->ops->event_write(&ctx, &event_notifier->user_token, |
| 32 | sizeof(event_notifier->user_token)); |
| 33 | event_notifier_group->ops->event_commit(&ctx); |
| 34 | irq_work_queue(&event_notifier_group->wakeup_pending); |
| 35 | } |