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/* test_tickless.c - tickless idle tests */
/*
* Copyright (c) 2011, 2013-2014 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
Unit test for tickless idle feature.
*/
#include <vxmicro.h>
#include <misc/printk.h>
#include <nanokernel/cpu.h>
#include <tc_util.h>
#define SLEEP_TICKS 10
#ifdef CONFIG_TICKLESS_IDLE
extern int32_t _sys_idle_threshold_ticks;
#endif
/* Clock speed - will change from BSP to BSP */
#define CAL_REPS 16
/*
* Arch-specific timer resolution/size types, definitions and
* timestamp routines.
*/
#if defined(VXMICRO_ARCH_x86)
typedef uint64_t _timer_res_t;
#define _TIMER_ZERO 0ULL
/* timestamp routines */
#define _TIMESTAMP_OPEN()
#define _TIMESTAMP_READ() (_NanoTscRead())
#define _TIMESTAMP_CLOSE()
#elif defined(CONFIG_ARM)
# if defined(CONFIG_BSP_TI_LM3S6965_QEMU)
/* A bug in the QEMU ARMv7-M sysTick timer prevents tickless idle support */
#error "This QEMU target does not support tickless idle!"
# endif
typedef uint32_t _timer_res_t;
#define _TIMER_ZERO 0
/* timestamp routines, from timestamps.c */
extern void _TimestampOpen(void);
extern uint32_t _TimestampRead(void);
extern void _TimestampClose(void);
#define _TIMESTAMP_OPEN() (_TimestampOpen())
#define _TIMESTAMP_READ() (_TimestampRead())
#define _TIMESTAMP_CLOSE() (_TimestampClose())
#else
#error "Unknown target"
#endif
void ticklessTestTask(void)
{
int32_t start_ticks;
int32_t end_ticks;
int32_t diff_ticks;
_timer_res_t start_tsc;
_timer_res_t end_tsc;
_timer_res_t cal_tsc = _TIMER_ZERO;
_timer_res_t diff_tsc = _TIMER_ZERO;
_timer_res_t diff_per;
#ifdef CONFIG_TICKLESS_IDLE
int32_t oldThreshold;
#endif
int i;
printk("Tickless Idle Test\n");
#ifndef CONFIG_TICKLESS_IDLE
printk("WARNING! Tickless idle support has not been enabled!\n");
#endif
printk("Calibrating TSC...\n");
#ifdef CONFIG_TICKLESS_IDLE
oldThreshold = _sys_idle_threshold_ticks;
/* make sure we do not enter tickless idle mode */
_sys_idle_threshold_ticks = 0x7FFFFFFF;
#endif
/* initialize the timer, if necessary */
_TIMESTAMP_OPEN();
for (i = 0; i < CAL_REPS; i++) {
/*
* Do a single tick sleep to get us as close to a tick boundary
* as we can.
*/
task_sleep(1);
start_ticks = task_tick_get_32();
start_tsc = _TIMESTAMP_READ();
task_sleep(SLEEP_TICKS);
end_tsc = _TIMESTAMP_READ();
end_ticks = task_tick_get_32();
cal_tsc += end_tsc - start_tsc;
}
cal_tsc /= CAL_REPS;
#if defined(VXMICRO_ARCH_x86)
printk("Calibrated time stamp period = 0x%x%x\n",
(uint32_t)(cal_tsc >> 32), (uint32_t)(cal_tsc & 0xFFFFFFFFLL));
#elif defined(CONFIG_ARM)
printk("Calibrated time stamp period = 0x%x\n", cal_tsc);
#endif
printk("Do the real test with tickless enabled\n");
#ifdef CONFIG_TICKLESS_IDLE
_sys_idle_threshold_ticks = oldThreshold;
#endif
printk("Going idle for %d ticks...\n", SLEEP_TICKS);
for (i = 0; i < CAL_REPS; i++) {
/*
* Do a single tick sleep to get us as close to a tick boundary
* as we can.
*/
task_sleep(1);
start_ticks = task_tick_get_32();
start_tsc = _TIMESTAMP_READ();
task_sleep(SLEEP_TICKS);
end_tsc = _TIMESTAMP_READ();
end_ticks = task_tick_get_32();
diff_tsc += end_tsc - start_tsc;
}
diff_tsc /= CAL_REPS;
diff_ticks = end_ticks - start_ticks;
printk("start ticks : %d\n", start_ticks);
printk("end ticks : %d\n", end_ticks);
printk("diff ticks : %d\n", diff_ticks);
#if defined(VXMICRO_ARCH_x86)
printk("diff time stamp: 0x%x%x\n",
(uint32_t)(diff_tsc >> 32), (uint32_t)(diff_tsc & 0xFFFFFFFFULL));
printk("Cal time stamp: 0x%x%x\n",
(uint32_t)(cal_tsc >> 32), (uint32_t)(cal_tsc & 0xFFFFFFFFLL));
#elif defined(CONFIG_ARM)
printk("diff time stamp: 0x%x\n", diff_tsc);
printk("Cal time stamp: 0x%x\n", cal_tsc);
#endif
/* Calculate percentage difference between calibrated TSC diff and measured result */
if (diff_tsc > cal_tsc)
diff_per = (100 * (diff_tsc - cal_tsc)) / cal_tsc;
else
diff_per = (100 * (cal_tsc - diff_tsc)) / cal_tsc;
printk("variance in time stamp diff: %d percent\n", (int32_t)diff_per);
if (diff_ticks != SLEEP_TICKS) {
printk("* TEST FAILED. TICK COUNT INCORRECT *\n");
TC_END_REPORT(TC_FAIL);
}
else {
TC_END_REPORT(TC_PASS);
}
/* release the timer, if necessary */
_TIMESTAMP_CLOSE();
while(1);
}
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