+++ /dev/null
-/* SPDX-License-Identifier: BSD-3-Clause
- * Copyright(c) 2010-2014 Intel Corporation
- */
-#include <stdio.h>
-#include <stdint.h>
-#include <signal.h>
-#include <errno.h>
-#include <string.h>
-#include <sys/queue.h>
-#include <sys/time.h>
-#include <sys/timerfd.h>
-
-#include <rte_memory.h>
-#include <rte_interrupts.h>
-#include <rte_alarm.h>
-#include <rte_common.h>
-#include <rte_per_lcore.h>
-#include <rte_eal.h>
-#include <rte_launch.h>
-#include <rte_lcore.h>
-#include <rte_errno.h>
-#include <rte_spinlock.h>
-#include <eal_private.h>
-
-#ifndef TFD_NONBLOCK
-#include <fcntl.h>
-#define TFD_NONBLOCK O_NONBLOCK
-#endif
-
-#define NS_PER_US 1000
-#define US_PER_MS 1000
-#define MS_PER_S 1000
-#ifndef US_PER_S
-#define US_PER_S (US_PER_MS * MS_PER_S)
-#endif
-
-#ifdef CLOCK_MONOTONIC_RAW /* Defined in glibc bits/time.h */
-#define CLOCK_TYPE_ID CLOCK_MONOTONIC_RAW
-#else
-#define CLOCK_TYPE_ID CLOCK_MONOTONIC
-#endif
-
-struct alarm_entry {
- LIST_ENTRY(alarm_entry) next;
- struct timeval time;
- rte_eal_alarm_callback cb_fn;
- void *cb_arg;
- volatile uint8_t executing;
- volatile pthread_t executing_id;
-};
-
-static LIST_HEAD(alarm_list, alarm_entry) alarm_list = LIST_HEAD_INITIALIZER();
-static rte_spinlock_t alarm_list_lk = RTE_SPINLOCK_INITIALIZER;
-
-static struct rte_intr_handle intr_handle = {.fd = -1 };
-static int handler_registered = 0;
-static void eal_alarm_callback(void *arg);
-
-int
-rte_eal_alarm_init(void)
-{
- intr_handle.type = RTE_INTR_HANDLE_ALARM;
- /* create a timerfd file descriptor */
- intr_handle.fd = timerfd_create(CLOCK_MONOTONIC, TFD_NONBLOCK);
- if (intr_handle.fd == -1)
- goto error;
-
- return 0;
-
-error:
- rte_errno = errno;
- return -1;
-}
-
-static void
-eal_alarm_callback(void *arg __rte_unused)
-{
- struct timespec now;
- struct alarm_entry *ap;
-
- rte_spinlock_lock(&alarm_list_lk);
- while ((ap = LIST_FIRST(&alarm_list)) !=NULL &&
- clock_gettime(CLOCK_TYPE_ID, &now) == 0 &&
- (ap->time.tv_sec < now.tv_sec || (ap->time.tv_sec == now.tv_sec &&
- (ap->time.tv_usec * NS_PER_US) <= now.tv_nsec))) {
- ap->executing = 1;
- ap->executing_id = pthread_self();
- rte_spinlock_unlock(&alarm_list_lk);
-
- ap->cb_fn(ap->cb_arg);
-
- rte_spinlock_lock(&alarm_list_lk);
-
- LIST_REMOVE(ap, next);
- free(ap);
- }
-
- if (!LIST_EMPTY(&alarm_list)) {
- struct itimerspec atime = { .it_interval = { 0, 0 } };
-
- ap = LIST_FIRST(&alarm_list);
- atime.it_value.tv_sec = ap->time.tv_sec;
- atime.it_value.tv_nsec = ap->time.tv_usec * NS_PER_US;
- /* perform borrow for subtraction if necessary */
- if (now.tv_nsec > (ap->time.tv_usec * NS_PER_US))
- atime.it_value.tv_sec--, atime.it_value.tv_nsec += US_PER_S * NS_PER_US;
-
- atime.it_value.tv_sec -= now.tv_sec;
- atime.it_value.tv_nsec -= now.tv_nsec;
- timerfd_settime(intr_handle.fd, 0, &atime, NULL);
- }
- rte_spinlock_unlock(&alarm_list_lk);
-}
-
-int
-rte_eal_alarm_set(uint64_t us, rte_eal_alarm_callback cb_fn, void *cb_arg)
-{
- struct timespec now;
- int ret = 0;
- struct alarm_entry *ap, *new_alarm;
-
- /* Check parameters, including that us won't cause a uint64_t overflow */
- if (us < 1 || us > (UINT64_MAX - US_PER_S) || cb_fn == NULL)
- return -EINVAL;
-
- new_alarm = calloc(1, sizeof(*new_alarm));
- if (new_alarm == NULL)
- return -ENOMEM;
-
- /* use current time to calculate absolute time of alarm */
- clock_gettime(CLOCK_TYPE_ID, &now);
-
- new_alarm->cb_fn = cb_fn;
- new_alarm->cb_arg = cb_arg;
- new_alarm->time.tv_usec = ((now.tv_nsec / NS_PER_US) + us) % US_PER_S;
- new_alarm->time.tv_sec = now.tv_sec + (((now.tv_nsec / NS_PER_US) + us) / US_PER_S);
-
- rte_spinlock_lock(&alarm_list_lk);
- if (!handler_registered) {
- ret |= rte_intr_callback_register(&intr_handle,
- eal_alarm_callback, NULL);
- handler_registered = (ret == 0) ? 1 : 0;
- }
-
- if (LIST_EMPTY(&alarm_list))
- LIST_INSERT_HEAD(&alarm_list, new_alarm, next);
- else {
- LIST_FOREACH(ap, &alarm_list, next) {
- if (ap->time.tv_sec > new_alarm->time.tv_sec ||
- (ap->time.tv_sec == new_alarm->time.tv_sec &&
- ap->time.tv_usec > new_alarm->time.tv_usec)){
- LIST_INSERT_BEFORE(ap, new_alarm, next);
- break;
- }
- if (LIST_NEXT(ap, next) == NULL) {
- LIST_INSERT_AFTER(ap, new_alarm, next);
- break;
- }
- }
- }
-
- if (LIST_FIRST(&alarm_list) == new_alarm) {
- struct itimerspec alarm_time = {
- .it_interval = {0, 0},
- .it_value = {
- .tv_sec = us / US_PER_S,
- .tv_nsec = (us % US_PER_S) * NS_PER_US,
- },
- };
- ret |= timerfd_settime(intr_handle.fd, 0, &alarm_time, NULL);
- }
- rte_spinlock_unlock(&alarm_list_lk);
-
- return ret;
-}
-
-int
-rte_eal_alarm_cancel(rte_eal_alarm_callback cb_fn, void *cb_arg)
-{
- struct alarm_entry *ap, *ap_prev;
- int count = 0;
- int err = 0;
- int executing;
-
- if (!cb_fn) {
- rte_errno = EINVAL;
- return -1;
- }
-
- do {
- executing = 0;
- rte_spinlock_lock(&alarm_list_lk);
- /* remove any matches at the start of the list */
- while ((ap = LIST_FIRST(&alarm_list)) != NULL &&
- cb_fn == ap->cb_fn &&
- (cb_arg == (void *)-1 || cb_arg == ap->cb_arg)) {
-
- if (ap->executing == 0) {
- LIST_REMOVE(ap, next);
- free(ap);
- count++;
- } else {
- /* If calling from other context, mark that alarm is executing
- * so loop can spin till it finish. Otherwise we are trying to
- * cancel our self - mark it by EINPROGRESS */
- if (pthread_equal(ap->executing_id, pthread_self()) == 0)
- executing++;
- else
- err = EINPROGRESS;
-
- break;
- }
- }
- ap_prev = ap;
-
- /* now go through list, removing entries not at start */
- LIST_FOREACH(ap, &alarm_list, next) {
- /* this won't be true first time through */
- if (cb_fn == ap->cb_fn &&
- (cb_arg == (void *)-1 || cb_arg == ap->cb_arg)) {
-
- if (ap->executing == 0) {
- LIST_REMOVE(ap, next);
- free(ap);
- count++;
- ap = ap_prev;
- } else if (pthread_equal(ap->executing_id, pthread_self()) == 0)
- executing++;
- else
- err = EINPROGRESS;
- }
- ap_prev = ap;
- }
- rte_spinlock_unlock(&alarm_list_lk);
- } while (executing != 0);
-
- if (count == 0 && err == 0)
- rte_errno = ENOENT;
- else if (err)
- rte_errno = err;
-
- return count;
-}
projects / ceph.git / blobdiff