1 /* SPDX-License-Identifier: BSD-3-Clause
2 * Copyright(c) 2010-2014 Intel Corporation
13 #include <rte_common.h>
14 #include <rte_compat.h>
16 #include <rte_cycles.h>
17 #include <rte_pause.h>
20 #include "eal_private.h"
21 #include "eal_memcfg.h"
23 /* The frequency of the RDTSC timer resolution */
24 static uint64_t eal_tsc_resolution_hz;
26 /* Pointer to user delay function */
27 void (*rte_delay_us)(unsigned int) = NULL;
30 rte_delay_us_block(unsigned int us)
32 const uint64_t start = rte_get_timer_cycles();
33 const uint64_t ticks = (uint64_t)us * rte_get_timer_hz() / 1E6;
34 while ((rte_get_timer_cycles() - start) < ticks)
39 rte_delay_us_sleep(unsigned int us)
41 struct timespec wait[2];
46 wait[0].tv_sec = us / US_PER_S;
47 us -= wait[0].tv_sec * US_PER_S;
49 wait[0].tv_nsec = 1000 * us;
51 while (nanosleep(&wait[ind], &wait[1 - ind]) && errno == EINTR) {
53 * Sleep was interrupted. Flip the index, so the 'remainder'
54 * will become the 'request' for a next call.
63 return eal_tsc_resolution_hz;
67 estimate_tsc_freq(void)
69 #define CYC_PER_10MHZ 1E7
70 RTE_LOG(WARNING, EAL, "WARNING: TSC frequency estimated roughly"
71 " - clock timings may be less accurate.\n");
72 /* assume that the sleep(1) will sleep for 1 second */
73 uint64_t start = rte_rdtsc();
75 /* Round up to 10Mhz. 1E7 ~ 10Mhz */
76 return RTE_ALIGN_MUL_NEAR(rte_rdtsc() - start, CYC_PER_10MHZ);
82 struct rte_mem_config *mcfg = rte_eal_get_configuration()->mem_config;
85 if (rte_eal_process_type() == RTE_PROC_SECONDARY) {
87 * Just use the primary process calculated TSC rate in any
88 * secondary process. It avoids any unnecessary overhead on
89 * systems where arch-specific frequency detection is not
92 eal_tsc_resolution_hz = mcfg->tsc_hz;
96 freq = get_tsc_freq_arch();
98 freq = get_tsc_freq();
100 freq = estimate_tsc_freq();
102 RTE_LOG(DEBUG, EAL, "TSC frequency is ~%" PRIu64 " KHz\n", freq / 1000);
103 eal_tsc_resolution_hz = freq;
107 void rte_delay_us_callback_register(void (*userfunc)(unsigned int))
109 rte_delay_us = userfunc;
112 RTE_INIT(rte_timer_init)
114 /* set rte_delay_us_block as a delay function */
115 rte_delay_us_callback_register(rte_delay_us_block);