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/*
* RTLinux irq test
*
* measures semaphore wakeup operation performance
*
* (C) FSMLabs 2000. Michael Barabanov <baraban@fsmlabs.com>
* Released under the GNU GENERAL PUBLIC LICENSE Version 2, June 1991
* Any use of this code must include this notice.
*/
#include <rtl.h>
#include <rtl_fifo.h>
#include <time.h>
#include <rtl_sched.h>
#include <rtl_sync.h>
#include <pthread.h>
#include <unistd.h>
#include <rtl_debug.h>
#include <errno.h>
#include <semaphore.h>
#include "common.h"
int irq=14;
int ntests=100;
int setfocus=0; /* 0 or 1 */
MODULE_PARM(irq,"i");
MODULE_PARM(ntests,"i");
MODULE_PARM(setfocus,"i");
pthread_t thread;
int fd_fifo;
hrtime_t irqtime;
sem_t irqsem;
unsigned int intr_handler(unsigned int irq, struct pt_regs *regs)
{
/* rtl_printf("%d", rtl_getcpuid()); */
irqtime = gethrtime();
rtl_global_pend_irq (irq);
sem_post(&irqsem);
return 0;
}
void *thread_code(void *param) {
hrtime_t diff;
hrtime_t now;
hrtime_t min_diff;
hrtime_t max_diff;
struct sample samp;
int i;
int cpu_id = rtl_getcpuid();
rtl_printf ("Measurement task starts on CPU %d\n", cpu_id);
fd_fifo = open("/dev/rtf0", O_NONBLOCK);
if (fd_fifo < 0) {
rtl_printf("/dev/rtf0 open returned %d\n", fd_fifo);
return (void *) -1;
}
do {
min_diff = 2000000000;
max_diff = -2000000000;
for (i = 0; i < ntests; i++) {
sem_wait (&irqsem);
now = gethrtime();
diff = now - irqtime;
if (diff < min_diff) {
min_diff = diff;
}
if (diff > max_diff) {
max_diff = diff;
}
}
samp.min = min_diff;
samp.max = max_diff;
write (fd_fifo, &samp, sizeof(samp));
} while (1);
return 0;
}
unsigned long oldaffinity;
int init_module(void)
{
int ret;
unsigned long affinity = 1 << rtl_getcpuid();
rtf_destroy(0);
rtf_create(0, 4000);
ret = rtl_request_irq (irq, intr_handler);
if (ret) {
rtl_printf("failed to get irq%d: %d\n", irq, ret);
} else {
rtl_printf("got irq%d\n", irq);
}
if (setfocus) {
rtl_printf("setting irq%d distribution mask to %x\n", irq, affinity);
rtl_irq_set_affinity (irq, &affinity, &oldaffinity);
}
sem_init (&irqsem, 1, 0);
rtl_printf("RTLinux measurement module on CPU %d\n",rtl_getcpuid());
pthread_create (&thread, NULL, thread_code, (void *)1);
return 0;
}
void cleanup_module(void)
{
rtl_printf ("Removing module on CPU %d\n", rtl_getcpuid());
rtl_free_irq (irq);
if (setfocus) {
rtl_irq_set_affinity (irq, &oldaffinity, NULL);
}
rtl_printf("freed irq%d\n", irq);
pthread_cancel (thread);
pthread_join (thread, NULL);
sem_destroy (&irqsem);
close(fd_fifo);
rtf_destroy(0);
}
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