0dcad8331b
The term 'context' is vague and overloaded. Its usage for 'an execution
context' is now referred as such, in both comments and some APIs' names.
When the execution context can only be a fiber or a task (i.e. not an
ISR), it is referred to as a 'thread', again in comments and everywhere
in the code.
APIs that had their names changed:
- nano_context_id_t is now nano_thread_id_t
- context_self_get() is now sys_thread_self_get()
- context_type_get() is now sys_execution_context_type_get()
- context_custom_data_set/get() are now
sys_thread_custom_data_set/get()
The 'context' prefix namespace does not have to be reserved by the
kernel anymore.
The Context Control Structure (CCS) data structure is now the Thread
Control Structure (TCS):
- struct ccs is now struct tcs
- tCCS is now tTCS
Change-Id: I7526a76c5b01e7c86333078e2d2e77c9feef5364
Signed-off-by: Benjamin Walsh <benjamin.walsh@windriver.com>
122 lines
4.2 KiB
C
122 lines
4.2 KiB
C
/*
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* Copyright (c) 2015 Intel Corporation
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1) Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* 2) Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* 3) Neither the name of Intel Corporation nor the names of its contributors
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* may be used to endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* @file
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* @brief Profiler support.
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*/
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#include <misc/profiler.h>
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#include <misc/util.h>
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#include <init.h>
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#include <nano_private.h>
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uint32_t _sys_profiler_buffer[CONFIG_PROFILER_BUFFER_SIZE];
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#ifdef CONFIG_PROFILER_CONTEXT_SWITCH
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void *_collector_fiber=NULL;
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#endif
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/**
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* @brief Initialize the profiler system.
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*
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* @details Initialize the ring buffer and the sync semaphore.
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*
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* @return No return value.
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*/
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static int _sys_profiler_init(struct device *arg)
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{
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ARG_UNUSED(arg);
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sys_event_logger_init(&sys_profiler_logger, _sys_profiler_buffer,
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CONFIG_PROFILER_BUFFER_SIZE);
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return 0;
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}
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DECLARE_DEVICE_INIT_CONFIG(profiler_0, "", _sys_profiler_init, NULL);
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nano_early_init(profiler_0, NULL);
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void sys_profiler_put_timed(uint16_t event_id)
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{
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uint32_t data[1];
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data[0] = nano_tick_get_32();
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sys_event_logger_put(&sys_profiler_logger, event_id, data,
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ARRAY_SIZE(data));
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}
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#ifdef CONFIG_PROFILER_CONTEXT_SWITCH
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void _sys_profiler_context_switch(void)
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{
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extern tNANO _nanokernel;
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uint32_t data[2];
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extern void _sys_event_logger_put_non_preemptible(
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struct event_logger *logger, uint16_t event_id, uint32_t *event_data,
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uint8_t data_size);
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/* if the profiler has not been initialized, we do nothing */
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if (sys_profiler_logger.buffer == NULL) {
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return;
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}
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if (_collector_fiber != _nanokernel.current) {
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data[0] = nano_tick_get_32();
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data[1] = (uint32_t)_nanokernel.current;
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/*
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* The mechanism we use to log the profile events uses a sync semaphore
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* to inform that there are available events to be collected. The
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* context switch event can be triggered from a task. When we
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* signal a semaphore from a task and a fiber is waiting for
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* that semaphore, a context switch is generated immediately. Due to
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* the fact that we register the context switch event while the context
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* switch is being processed, a new context switch can be generated
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* before the kernel finishes processing the current context switch. We
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* need to prevent this because the kernel is not able to handle it.
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* The _sem_give_non_preemptible function does not trigger a context
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* switch when we signal the semaphore from any type of thread. Using
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* _sys_event_logger_put_non_preemptible function, that internally uses
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* _sem_give_non_preemptible function for signaling the sync semaphore,
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* allow us registering the context switch event without triggering any
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* new context switch during the process.
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*/
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_sys_event_logger_put_non_preemptible(&sys_profiler_logger,
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PROFILER_CONTEXT_SWITCH_EVENT_ID, data, ARRAY_SIZE(data));
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}
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}
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void sys_profiler_register_as_collector(void)
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{
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_collector_fiber = _nanokernel.current;
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}
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#endif /* CONFIG_PROFILER_CONTEXT_SWITCH */
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