From 040cf8a4118787e6cd3963ed5fee1539f837c375 Mon Sep 17 00:00:00 2001 From: Ravi Kerur Date: Sat, 25 Jul 2015 12:36:28 -0700 Subject: [PATCH] eal: deduplicate timer functions Move common functions from BSD/Linux to eal_common_timer.c. BSD uses sysctl and Linux uses CLOCK_MONOTIC_RAW to calibrate TSC. HPET is specific to Linux and not integrated in the common init. Signed-off-by: Ravi Kerur Signed-off-by: Thomas Monjalon --- lib/librte_eal/bsdapp/eal/Makefile | 1 + lib/librte_eal/bsdapp/eal/eal_timer.c | 58 ++--------------- lib/librte_eal/common/eal_common_timer.c | 83 ++++++++++++++++++++++++ lib/librte_eal/common/eal_private.h | 14 ++++ lib/librte_eal/linuxapp/eal/Makefile | 1 + lib/librte_eal/linuxapp/eal/eal_timer.c | 60 ++--------------- 6 files changed, 111 insertions(+), 106 deletions(-) create mode 100644 lib/librte_eal/common/eal_common_timer.c diff --git a/lib/librte_eal/bsdapp/eal/Makefile b/lib/librte_eal/bsdapp/eal/Makefile index 24733aea20..a9694354c7 100644 --- a/lib/librte_eal/bsdapp/eal/Makefile +++ b/lib/librte_eal/bsdapp/eal/Makefile @@ -61,6 +61,7 @@ SRCS-$(CONFIG_RTE_LIBRTE_EAL_BSDAPP) += eal_alarm.c # from common dir SRCS-$(CONFIG_RTE_LIBRTE_EAL_BSDAPP) += eal_common_lcore.c +SRCS-$(CONFIG_RTE_LIBRTE_EAL_BSDAPP) += eal_common_timer.c SRCS-$(CONFIG_RTE_LIBRTE_EAL_BSDAPP) += eal_common_memzone.c SRCS-$(CONFIG_RTE_LIBRTE_EAL_BSDAPP) += eal_common_log.c SRCS-$(CONFIG_RTE_LIBRTE_EAL_BSDAPP) += eal_common_launch.c diff --git a/lib/librte_eal/bsdapp/eal/eal_timer.c b/lib/librte_eal/bsdapp/eal/eal_timer.c index 7147abe3a1..f12d9bd2b5 100644 --- a/lib/librte_eal/bsdapp/eal/eal_timer.c +++ b/lib/librte_eal/bsdapp/eal/eal_timer.c @@ -55,29 +55,12 @@ enum timer_source eal_timer_source = EAL_TIMER_TSC; -/* The frequency of the RDTSC timer resolution */ -static uint64_t eal_tsc_resolution_hz = 0; - -void -rte_delay_us(unsigned us) -{ - const uint64_t start = rte_get_timer_cycles(); - const uint64_t ticks = (uint64_t)us * rte_get_timer_hz() / 1E6; - while ((rte_get_timer_cycles() - start) < ticks) - rte_pause(); -} - uint64_t -rte_get_tsc_hz(void) -{ - return eal_tsc_resolution_hz; -} - -static int -set_tsc_freq_from_sysctl(void) +get_tsc_freq(void) { size_t sz; int tmp; + uint64_t tsc_hz; sz = sizeof(tmp); tmp = 0; @@ -94,42 +77,13 @@ set_tsc_freq_from_sysctl(void) else if (tmp != 1) RTE_LOG(WARNING, EAL, "TSC is not invariant\n"); - sz = sizeof(eal_tsc_resolution_hz); - if (sysctlbyname("machdep.tsc_freq", &eal_tsc_resolution_hz, &sz, NULL, 0)) { + sz = sizeof(tsc_hz); + if (sysctlbyname("machdep.tsc_freq", &tsc_hz, &sz, NULL, 0)) { RTE_LOG(WARNING, EAL, "%s\n", strerror(errno)); - return -1; + return 0; } - return 0; -} - -static void -set_tsc_freq_fallback(void) -{ - RTE_LOG(WARNING, EAL, "WARNING: clock_gettime cannot use " - "CLOCK_MONOTONIC_RAW and HPET is not available" - " - clock timings may be less accurate.\n"); - /* assume that the sleep(1) will sleep for 1 second */ - uint64_t start = rte_rdtsc(); - sleep(1); - eal_tsc_resolution_hz = rte_rdtsc() - start; -} - -/* - * This function measures the TSC frequency. It uses a variety of approaches. - * - * 1. Read the TSC frequency value provided by the kernel - * 2. If above does not work, just sleep for 1 second and tune off that, - * printing a warning about inaccuracy of timing - */ -static void -set_tsc_freq(void) -{ - if (set_tsc_freq_from_sysctl() < 0) - set_tsc_freq_fallback(); - - RTE_LOG(INFO, EAL, "TSC frequency is ~%"PRIu64" KHz\n", - eal_tsc_resolution_hz/1000); + return tsc_hz; } int diff --git a/lib/librte_eal/common/eal_common_timer.c b/lib/librte_eal/common/eal_common_timer.c new file mode 100644 index 0000000000..29567034d7 --- /dev/null +++ b/lib/librte_eal/common/eal_common_timer.c @@ -0,0 +1,83 @@ +/*- + * BSD LICENSE + * + * Copyright(c) 2010-2014 Intel Corporation. All rights reserved. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * * Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * * Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * * Neither the name of Intel Corporation nor the names of its + * contributors may be used to endorse or promote products derived + * from this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include + +#include "eal_private.h" + +/* The frequency of the RDTSC timer resolution */ +static uint64_t eal_tsc_resolution_hz; + +void +rte_delay_us(unsigned us) +{ + const uint64_t start = rte_get_timer_cycles(); + const uint64_t ticks = (uint64_t)us * rte_get_timer_hz() / 1E6; + while ((rte_get_timer_cycles() - start) < ticks) + rte_pause(); +} + +uint64_t +rte_get_tsc_hz(void) +{ + return eal_tsc_resolution_hz; +} + +static uint64_t +estimate_tsc_freq(void) +{ + RTE_LOG(WARNING, EAL, "WARNING: TSC frequency estimated roughly" + " - clock timings may be less accurate.\n"); + /* assume that the sleep(1) will sleep for 1 second */ + uint64_t start = rte_rdtsc(); + sleep(1); + return rte_rdtsc() - start; +} + +void +set_tsc_freq(void) +{ + uint64_t freq = get_tsc_freq() || estimate_tsc_freq(); + RTE_LOG(INFO, EAL, "TSC frequency is ~%" PRIu64 " KHz\n", freq / 1000); + eal_tsc_resolution_hz = freq; +} diff --git a/lib/librte_eal/common/eal_private.h b/lib/librte_eal/common/eal_private.h index 8505b05b68..f8e88692db 100644 --- a/lib/librte_eal/common/eal_private.h +++ b/lib/librte_eal/common/eal_private.h @@ -314,4 +314,18 @@ unsigned eal_cpu_core_id(unsigned lcore_id); */ int eal_cpu_detected(unsigned lcore_id); +/** + * Set TSC frequency from precise value or estimation + * + * This function is private to the EAL. + */ +void set_tsc_freq(void); + +/** + * Get precise TSC frequency from system + * + * This function is private to the EAL. + */ +uint64_t get_tsc_freq(void); + #endif /* _EAL_PRIVATE_H_ */ diff --git a/lib/librte_eal/linuxapp/eal/Makefile b/lib/librte_eal/linuxapp/eal/Makefile index f4f8cdf0c2..376d275547 100644 --- a/lib/librte_eal/linuxapp/eal/Makefile +++ b/lib/librte_eal/linuxapp/eal/Makefile @@ -71,6 +71,7 @@ endif # from common dir SRCS-$(CONFIG_RTE_LIBRTE_EAL_LINUXAPP) += eal_common_lcore.c +SRCS-$(CONFIG_RTE_LIBRTE_EAL_LINUXAPP) += eal_common_timer.c SRCS-$(CONFIG_RTE_LIBRTE_EAL_LINUXAPP) += eal_common_memzone.c SRCS-$(CONFIG_RTE_LIBRTE_EAL_LINUXAPP) += eal_common_log.c SRCS-$(CONFIG_RTE_LIBRTE_EAL_LINUXAPP) += eal_common_launch.c diff --git a/lib/librte_eal/linuxapp/eal/eal_timer.c b/lib/librte_eal/linuxapp/eal/eal_timer.c index 94909edb33..76a8a651d8 100644 --- a/lib/librte_eal/linuxapp/eal/eal_timer.c +++ b/lib/librte_eal/linuxapp/eal/eal_timer.c @@ -57,9 +57,6 @@ enum timer_source eal_timer_source = EAL_TIMER_HPET; -/* The frequency of the RDTSC timer resolution */ -static uint64_t eal_tsc_resolution_hz = 0; - #ifdef RTE_LIBEAL_USE_HPET #define DEV_HPET "/dev/hpet" @@ -160,23 +157,6 @@ rte_get_hpet_cycles(void) #endif - -void -rte_delay_us(unsigned us) -{ - const uint64_t start = rte_get_timer_cycles(); - const uint64_t ticks = (uint64_t)us * rte_get_timer_hz() / 1E6; - while ((rte_get_timer_cycles() - start) < ticks) - rte_pause(); -} - -uint64_t -rte_get_tsc_hz(void) -{ - return eal_tsc_resolution_hz; -} - - #ifdef RTE_LIBEAL_USE_HPET /* * Open and mmap /dev/hpet (high precision event timer) that will @@ -275,8 +255,8 @@ check_tsc_flags(void) fclose(stream); } -static int -set_tsc_freq_from_clock(void) +uint64_t +get_tsc_freq(void) { #ifdef CLOCK_MONOTONIC_RAW #define NS_PER_SEC 1E9 @@ -284,6 +264,7 @@ set_tsc_freq_from_clock(void) struct timespec sleeptime = {.tv_nsec = 5E8 }; /* 1/2 second */ struct timespec t_start, t_end; + uint64_t tsc_hz; if (clock_gettime(CLOCK_MONOTONIC_RAW, &t_start) == 0) { uint64_t ns, end, start = rte_rdtsc(); @@ -294,40 +275,11 @@ set_tsc_freq_from_clock(void) ns += (t_end.tv_nsec - t_start.tv_nsec); double secs = (double)ns/NS_PER_SEC; - eal_tsc_resolution_hz = (uint64_t)((end - start)/secs); - return 0; + tsc_hz = (uint64_t)((end - start)/secs); + return tsc_hz; } #endif - return -1; -} - -static void -set_tsc_freq_fallback(void) -{ - RTE_LOG(WARNING, EAL, "WARNING: clock_gettime cannot use " - "CLOCK_MONOTONIC_RAW and HPET is not available" - " - clock timings may be less accurate.\n"); - /* assume that the sleep(1) will sleep for 1 second */ - uint64_t start = rte_rdtsc(); - sleep(1); - eal_tsc_resolution_hz = rte_rdtsc() - start; -} -/* - * This function measures the TSC frequency. It uses a variety of approaches. - * - * 1. If kernel provides CLOCK_MONOTONIC_RAW we use that to tune the TSC value - * 2. If kernel does not provide that, and we have HPET support, tune using HPET - * 3. Lastly, if neither of the above can be used, just sleep for 1 second and - * tune off that, printing a warning about inaccuracy of timing - */ -static void -set_tsc_freq(void) -{ - if (set_tsc_freq_from_clock() < 0) - set_tsc_freq_fallback(); - - RTE_LOG(INFO, EAL, "TSC frequency is ~%"PRIu64" KHz\n", - eal_tsc_resolution_hz/1000); + return 0; } int -- 2.20.1