mirror of
https://github.com/zephyrproject-rtos/zephyr
synced 2025-09-04 22:32:29 +00:00
3f1439bf2d
The open braces of the 'if','for', 'while' and 'do' statements should be at the end on the
same line of the statement to comply with the defined coding style. E.g.:
if (x is true) {
we do y
}
Change accomplished with the following script:
#!/bin/bash
checkpatch_script="$VXMICRO_BASE/scripts/checkpatch.pl --mailback --no-tree -f --emacs --summary-file --show-types --ignore BRACES,PRINTK_WITHOUT_KERN_LEVEL,SPLIT_STRING --max-line-length=100 "
for file in $(find ./ -name "*.[ch]" ! -path "./scripts/*" ! -path "./host/src/wrsconfig/*" ! -path "*/outdir/*");
do
if [ ! -h $file ];
then
# obtaining the line's number where the error is reported in a reversed order
reversed_lines="";
for line in $(eval $checkpatch_script $file | grep "ERROR:OPEN_BRACE" | cut -d":" -f2)
do
reversed_lines="$line $reversed_lines";
done;
# fixing the issues in reverse order due to lines can be deleted affecting futher lines
for line_reported in $(echo $reversed_lines);
do
# search for the line where the open brace is
char_found="";
let line=$line_reported-1;
while [ ${#char_found} -eq 0 ]
do
let line=$line+1;
char_found="$(sed -n ''$line' { /{/ p }' $file)";
done
let statement_line=$line-1;
let brace_line=$line;
# condition to avoid modifying lines that ends with the character "\"
char_found="$(sed -n ''$statement_line' { /\\$/ p }' $file)";
if [ ${#char_found} -eq 0 ];
then
# fix the issue
echo "$file : reported on $line_reported (found on $brace_line -> moved to $statement_line)";
sed -i ''$statement_line' { s/[ \t]*$//; s/\([ \t]*\/\*.*\*\/\)$/ {\1/; /{/ b already_done s/$/ {/; :already_done }; '$brace_line' { s/{[ \t]*//; /^[ \t]*$/ d }; ' $file;
fi
done
fi
done;
Change-Id: I517c40bb33840ef531f2319354350f578b238abb
Signed-off-by: Yonattan Louise <yonattan.a.louise.mendoza@intel.com>
479 lines
12 KiB
C
479 lines
12 KiB
C
/* idle.c - microkernel idle logic */
|
|
|
|
/*
|
|
* Copyright (c) 1997-2010, 2012-2014 Wind River Systems, Inc.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions are met:
|
|
*
|
|
* 1) Redistributions of source code must retain the above copyright notice,
|
|
* this list of conditions and the following disclaimer.
|
|
*
|
|
* 2) 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.
|
|
*
|
|
* 3) Neither the name of Wind River Systems 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 HOLDER 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.
|
|
*/
|
|
|
|
/*
|
|
DESCRIPTION
|
|
Microkernel idle logic. Different forms of idling are performed by the idle
|
|
task, depending on how the kernel is configured.
|
|
*/
|
|
|
|
#include <microkernel/k_struct.h>
|
|
#include <minik.h>
|
|
#include <kticks.h>
|
|
#include <nanok.h>
|
|
#include <nanokernel/cpu.h>
|
|
#include <toolchain.h>
|
|
#include <sections.h>
|
|
#include <microkernel.h>
|
|
|
|
#if defined(CONFIG_WORKLOAD_MONITOR)
|
|
|
|
static unsigned int _k_workload_slice = 0x0;
|
|
static unsigned int _k_workload_ticks = 0x0;
|
|
static unsigned int _k_workload_ref_time = 0x0;
|
|
static unsigned int _k_workload_t0 = 0x0;
|
|
static unsigned int _k_workload_t1 = 0x0;
|
|
static volatile unsigned int _k_workload_n0 = 0x0;
|
|
static volatile unsigned int _k_workload_n1 = 0x0;
|
|
static volatile unsigned int _k_workload_i = 0x0;
|
|
static volatile unsigned int _k_workload_i0 = 0x0;
|
|
static volatile unsigned int _k_workload_delta = 0x0;
|
|
static volatile unsigned int _k_workload_start_time = 0x0;
|
|
static volatile unsigned int _k_workload_end_time = 0x0;
|
|
|
|
#ifdef WL_SCALE
|
|
static extern uint32_t _k_workload_scale;
|
|
#endif
|
|
|
|
#define MSEC_PER_SEC 1000
|
|
|
|
/*******************************************************************************
|
|
*
|
|
* workload_loop - shared code between workload calibration and monitoring
|
|
*
|
|
* Perform idle task "dummy work".
|
|
*
|
|
* This routine increments _k_workload_i and checks it against _k_workload_n1.
|
|
* _k_workload_n1 is updated by the system tick handler, and both are kept
|
|
* in close synchronization.
|
|
*
|
|
* RETURNS: N/A
|
|
*
|
|
*/
|
|
|
|
static void workload_loop(void)
|
|
{
|
|
volatile int x = 87654321;
|
|
volatile int y = 4;
|
|
|
|
/* loop never terminates, except during calibration phase */
|
|
|
|
while (++_k_workload_i != _k_workload_n1) {
|
|
unsigned int s_iCountDummyProc = 0;
|
|
while (64 != s_iCountDummyProc++) { /* 64 == 2^6 */
|
|
x >>= y;
|
|
x <<= y;
|
|
y++;
|
|
x >>= y;
|
|
x <<= y;
|
|
y--;
|
|
}
|
|
}
|
|
}
|
|
|
|
/*******************************************************************************
|
|
*
|
|
* workload_monitor_calibrate - calibrate the workload monitoring subsystem
|
|
*
|
|
* Measures the time required to do a fixed amount of "dummy work", and
|
|
* sets default values for the workload measuring period.
|
|
*
|
|
* RETURNS: N/A
|
|
*
|
|
*/
|
|
|
|
void workload_monitor_calibrate(void)
|
|
{
|
|
_k_workload_n0 = _k_workload_i = 0;
|
|
_k_workload_n1 = 1000;
|
|
|
|
_k_workload_t0 = timer_read();
|
|
workload_loop();
|
|
_k_workload_t1 = timer_read();
|
|
|
|
_k_workload_delta = _k_workload_t1 - _k_workload_t0;
|
|
_k_workload_i0 = _k_workload_i;
|
|
#ifdef WL_SCALE
|
|
_k_workload_ref_time =
|
|
(_k_workload_t1 - _k_workload_t0) >> (_k_workload_scale);
|
|
#else
|
|
_k_workload_ref_time = (_k_workload_t1 - _k_workload_t0) >> (4 + 6);
|
|
#endif
|
|
|
|
_k_workload_slice = 100;
|
|
_k_workload_ticks = 100;
|
|
}
|
|
|
|
/*******************************************************************************
|
|
*
|
|
* _k_workload_monitor_update - workload monitor tick handler
|
|
*
|
|
* If workload monitor is configured this routine updates the global variables
|
|
* it uses to record the passage of time.
|
|
*
|
|
* RETURNS: N/A
|
|
*
|
|
* \NOMANUAL
|
|
*/
|
|
|
|
void _k_workload_monitor_update(void)
|
|
{
|
|
if (--_k_workload_ticks == 0) {
|
|
_k_workload_t0 = _k_workload_t1;
|
|
_k_workload_t1 = timer_read();
|
|
_k_workload_n0 = _k_workload_n1;
|
|
_k_workload_n1 = _k_workload_i - 1;
|
|
_k_workload_ticks = _k_workload_slice;
|
|
}
|
|
}
|
|
|
|
/*******************************************************************************
|
|
*
|
|
* _k_workload_monitor_idle_start - workload monitor "start idling" handler
|
|
*
|
|
* Records time when idle task was selected for execution by the microkernel.
|
|
*
|
|
* RETURNS: N/A
|
|
*/
|
|
|
|
void _k_workload_monitor_idle_start(void)
|
|
{
|
|
_k_workload_start_time = timer_read();
|
|
}
|
|
|
|
/*******************************************************************************
|
|
*
|
|
* _k_workload_monitor_idle_end - workload monitor "end idling" handler
|
|
*
|
|
* Records time when idle task was no longer selected for execution by the
|
|
* microkernel, and updates amount of time spent idling.
|
|
*
|
|
* RETURNS: N/A
|
|
*/
|
|
|
|
void _k_workload_monitor_idle_end(void)
|
|
{
|
|
_k_workload_end_time = timer_read();
|
|
_k_workload_i += (_k_workload_i0 *
|
|
(_k_workload_end_time - _k_workload_start_time)) / _k_workload_delta;
|
|
}
|
|
|
|
/*******************************************************************************
|
|
*
|
|
* _k_workload_get - process request to read the processor workload
|
|
*
|
|
* Computes workload, or uses 0 if workload monitoring is not configured.
|
|
*
|
|
* RETURNS: N/A
|
|
*/
|
|
|
|
void _k_workload_get(struct k_args *P)
|
|
{
|
|
unsigned int k, t;
|
|
signed int iret;
|
|
|
|
k = (_k_workload_i - _k_workload_n0) * _k_workload_ref_time;
|
|
#ifdef WL_SCALE
|
|
t = (timer_read() - _k_workload_t0) >> (_k_workload_scale);
|
|
#else
|
|
t = (timer_read() - _k_workload_t0) >> (4 + 6);
|
|
#endif
|
|
|
|
iret = MSEC_PER_SEC - k / t;
|
|
|
|
/*
|
|
* Due to calibration at startup, <iret> could be slightly negative.
|
|
* Ensure a negative value is never returned.
|
|
*/
|
|
|
|
if (iret < 0) {
|
|
iret = 0;
|
|
}
|
|
|
|
P->Args.u1.rval = iret;
|
|
}
|
|
#else
|
|
void _k_workload_get(struct k_args *P)
|
|
{
|
|
P->Args.u1.rval = 0;
|
|
}
|
|
|
|
#endif /* CONFIG_WORKLOAD_MONITOR */
|
|
|
|
/*******************************************************************************
|
|
*
|
|
* task_workload_get - read the processor workload
|
|
*
|
|
* This routine returns the workload as a number ranging from 0 to 1000.
|
|
*
|
|
* Each unit equals 0.1% of the time the idle task was not scheduled by the
|
|
* microkernel during the period set by workload_time_slice_set().
|
|
*
|
|
* IMPORTANT: This workload monitor ignores any time spent servicing ISRs and
|
|
* fibers! Thus, a system which has no meaningful task work to do may spend
|
|
* up to 100% of its time servicing ISRs and fibers, yet report a workload of 0%
|
|
* because the idle task is always the task selected by the microkernel.
|
|
*
|
|
* RETURNS: workload
|
|
*/
|
|
|
|
int task_workload_get(void)
|
|
{
|
|
struct k_args A;
|
|
|
|
A.Comm = READWL;
|
|
KERNEL_ENTRY(&A);
|
|
return A.Args.u1.rval;
|
|
}
|
|
|
|
/*******************************************************************************
|
|
*
|
|
* workload_time_slice_set - set workload period
|
|
*
|
|
* This routine specifies the workload measuring period for task_workload_get().
|
|
*
|
|
* RETURNS: N/A
|
|
*/
|
|
|
|
void workload_time_slice_set(int32_t t)
|
|
{
|
|
#ifdef CONFIG_WORKLOAD_MONITOR
|
|
if (t < 10)
|
|
t = 10;
|
|
if (t > 1000)
|
|
t = 1000;
|
|
_k_workload_slice = t;
|
|
#else
|
|
ARG_UNUSED(t);
|
|
#endif
|
|
}
|
|
|
|
unsigned char _sys_power_save_flag = 1;
|
|
|
|
#if defined(CONFIG_ADVANCED_POWER_MANAGEMENT)
|
|
|
|
#include <cputype.h>
|
|
#include <nanokernel.h>
|
|
#include <nanokernel/cpu.h>
|
|
#include <microkernel/k_types.h>
|
|
#ifdef CONFIG_ADVANCED_IDLE
|
|
#include <advidle.h>
|
|
#endif
|
|
#if defined(CONFIG_TICKLESS_IDLE)
|
|
#include <drivers/system_timer.h>
|
|
#endif
|
|
|
|
extern void nano_cpu_idle(void);
|
|
extern void nano_cpu_set_idle(int32_t ticks);
|
|
|
|
#if defined(CONFIG_TICKLESS_IDLE)
|
|
/*
|
|
* Idle time must be this value or higher for timer to go into tickless idle
|
|
* state.
|
|
*/
|
|
int32_t _sys_idle_threshold_ticks = CONFIG_TICKLESS_IDLE_THRESH;
|
|
#endif /* CONFIG_TICKLESS_IDLE */
|
|
|
|
/*******************************************************************************
|
|
*
|
|
* _sys_power_save_idle - power management policy when kernel begins idling
|
|
*
|
|
* This routine implements the power management policy based on the time
|
|
* until the timer expires, in system ticks.
|
|
* Routine is invoked from the idle task with interrupts disabled
|
|
*
|
|
* RETURNS: N/A
|
|
*
|
|
* \NOMANUAL
|
|
*/
|
|
|
|
void _sys_power_save_idle(int32_t ticks)
|
|
{
|
|
#if defined(CONFIG_TICKLESS_IDLE)
|
|
if ((ticks == TICKS_UNLIMITED) || ticks >= _sys_idle_threshold_ticks) {
|
|
/*
|
|
* Stop generating system timer interrupts until it's time for
|
|
* the next scheduled microkernel timer to expire.
|
|
*/
|
|
|
|
_timer_idle_enter(ticks);
|
|
}
|
|
#endif /* CONFIG_TICKLESS_IDLE */
|
|
|
|
#ifdef CONFIG_ADVANCED_IDLE
|
|
/*
|
|
* Call the advanced sleep function, which checks if the system should
|
|
* enter a deep sleep state. If so, the function will return a non-zero
|
|
* value when the system resumes here after the deep sleep ends.
|
|
* If the time to sleep is too short to go to advanced sleep mode, the
|
|
* function returns zero immediately and we do normal idle processing.
|
|
*/
|
|
|
|
if (_AdvIdleFunc(ticks) == 0) {
|
|
nano_cpu_set_idle(ticks);
|
|
nano_cpu_idle();
|
|
}
|
|
#else
|
|
nano_cpu_set_idle(ticks);
|
|
nano_cpu_idle();
|
|
#endif /* CONFIG_ADVANCED_IDLE */
|
|
}
|
|
|
|
/*******************************************************************************
|
|
*
|
|
* _sys_power_save_idle_exit - power management policy when kernel stops idling
|
|
*
|
|
* This routine is invoked when the kernel leaves the idle state.
|
|
* Routine can be modified to wake up other devices.
|
|
* The routine is invoked from interrupt context, with interrupts disabled.
|
|
*
|
|
* RETURNS: N/A
|
|
*
|
|
* \NOMANUAL
|
|
*/
|
|
|
|
void _sys_power_save_idle_exit(int32_t ticks)
|
|
{
|
|
#ifdef CONFIG_TICKLESS_IDLE
|
|
if ((ticks == TICKS_UNLIMITED) || ticks >= _sys_idle_threshold_ticks) {
|
|
/* Resume normal periodic system timer interrupts */
|
|
|
|
_timer_idle_exit();
|
|
}
|
|
#else
|
|
ARG_UNUSED(ticks);
|
|
#endif /* CONFIG_TICKLESS_IDLE */
|
|
}
|
|
|
|
/*******************************************************************************
|
|
*
|
|
* _get_next_timer_expiry - obtain number of ticks until next timer expires
|
|
*
|
|
* Must be called with interrupts locked to prevent the timer queues from
|
|
* changing.
|
|
*
|
|
* RETURNS: Number of ticks until next timer expires.
|
|
*
|
|
*/
|
|
|
|
static inline int32_t _get_next_timer_expiry(void)
|
|
{
|
|
if (_k_timer_list_head)
|
|
return _k_timer_list_head->duration;
|
|
|
|
return TICKS_UNLIMITED;
|
|
}
|
|
#endif
|
|
|
|
/*******************************************************************************
|
|
*
|
|
* _power_save - power saving when idle
|
|
*
|
|
* If the BSP sets the _sys_power_save_flag flag, this routine will call the
|
|
* _sys_power_save_idle() routine in an infinite loop. If the flag is not set,
|
|
* this routine will fall through and kernel_idle() will try the next idling
|
|
* mechanism.
|
|
*
|
|
* RETURNS: N/A
|
|
*
|
|
*/
|
|
|
|
static void _power_save(void)
|
|
{
|
|
extern void nano_cpu_idle(void);
|
|
|
|
if (_sys_power_save_flag) {
|
|
for (;;) {
|
|
irq_lock_inline();
|
|
#ifdef CONFIG_ADVANCED_POWER_MANAGEMENT
|
|
_sys_power_save_idle(_get_next_timer_expiry());
|
|
#else
|
|
/*
|
|
* nano_cpu_idle () is invoked here directly only if APM is
|
|
* disabled. Otherwise BSP decides either to invoke it or
|
|
* to implement advanced idle functionality
|
|
*/
|
|
|
|
nano_cpu_idle();
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* Code analyzers may complain that _power_save() uses an
|
|
* infinite loop unless we indicate that this is intentional
|
|
*/
|
|
|
|
CODE_UNREACHABLE;
|
|
}
|
|
}
|
|
|
|
/* Specify what work to do when idle task is "busy waiting" */
|
|
|
|
#ifdef CONFIG_WORKLOAD_MONITOR
|
|
#define DO_IDLE_WORK() workload_loop()
|
|
#else
|
|
#define DO_IDLE_WORK() do { /* do nothing */ } while (0)
|
|
#endif
|
|
|
|
/*******************************************************************************
|
|
*
|
|
* kernel_idle - microkernel idle task
|
|
*
|
|
* If power save is on, we sleep; if power save is off, we "busy wait".
|
|
*
|
|
* RETURNS: N/A
|
|
*
|
|
*/
|
|
|
|
int kernel_idle(void)
|
|
{
|
|
_power_save(); /* never returns if power saving is enabled */
|
|
|
|
#ifdef CONFIG_BOOT_TIME_MEASUREMENT
|
|
/* record timestamp when idling begins */
|
|
|
|
extern uint64_t __idle_tsc;
|
|
__idle_tsc = _NanoTscRead();
|
|
#endif
|
|
|
|
for (;;) {
|
|
DO_IDLE_WORK();
|
|
}
|
|
|
|
/*
|
|
* Code analyzers may complain that kernel_idle() uses an infinite loop
|
|
* unless we indicate that this is intentional
|
|
*/
|
|
|
|
CODE_UNREACHABLE;
|
|
}
|