c928acc9ff
Adding the CONFIG_ARCH_PERF_EVENTS configuration to enable hardware performance counting，solve the problem that some platform hardware counting support is not perfect, you can choose to use software interface. This is configured using CONFIG_ARCH_PERF_EVENTS, so weak_functions are removed to prevent confusion To use hardware performance counting, must: 1. Configure CONFIG_ARCH_PERF_EVENTS, default selection 2. Call up_perf_init for initialization Signed-off-by: wangming9 <wangming9@xiaomi.com>
91 lines
3.0 KiB
C
91 lines
3.0 KiB
C
/****************************************************************************
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* arch/arm/src/armv7-a/arm_perf.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/arch.h>
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#include <nuttx/clock.h>
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#include "arm_internal.h"
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#include "sctlr.h"
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#ifdef CONFIG_ARCH_PERF_EVENTS
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/****************************************************************************
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* Private Data
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****************************************************************************/
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static unsigned long g_cpu_freq = ULONG_MAX;
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: up_perf_*
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*
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* Description:
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* The first interface simply provides the current time value in unknown
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* units. NOTE: This function may be called early before the timer has
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* been initialized. In that event, the function should just return a
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* start time of zero.
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*
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* Nothing is assumed about the units of this time value. The following
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* are assumed, however: (1) The time is an unsigned integer value, (2)
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* the time is monotonically increasing, and (3) the elapsed time (also
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* in unknown units) can be obtained by subtracting a start time from
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* the current time.
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*
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* The second interface simple converts an elapsed time into well known
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* units.
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*
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****************************************************************************/
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void up_perf_init(void *arg)
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{
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g_cpu_freq = (unsigned long)(uintptr_t)arg;
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cp15_pmu_uer(PMUER_UME);
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cp15_pmu_pmcr(PMCR_E);
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cp15_pmu_cesr(PMCESR_CCES);
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}
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unsigned long up_perf_getfreq(void)
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{
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return g_cpu_freq;
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}
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unsigned long up_perf_gettime(void)
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{
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return cp15_pmu_rdccr();
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}
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void up_perf_convert(unsigned long elapsed, struct timespec *ts)
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{
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unsigned long left;
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ts->tv_sec = elapsed / g_cpu_freq;
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left = elapsed - ts->tv_sec * g_cpu_freq;
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ts->tv_nsec = NSEC_PER_SEC * (uint64_t)left / g_cpu_freq;
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}
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#endif
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