125 lines
2.5 KiB
C
125 lines
2.5 KiB
C
|
// SPDX-License-Identifier: GPL-2.0-only
|
||
|
|
/*
|
||
|
|
* POWER Data Stream Control Register (DSCR) default test
|
||
|
|
*
|
||
|
|
* This test modifies the system wide default DSCR through
|
||
|
|
* it's sysfs interface and then verifies that all threads
|
||
|
|
* see the correct changed DSCR value immediately.
|
||
|
|
*
|
||
|
|
* Copyright 2012, Anton Blanchard, IBM Corporation.
|
||
|
|
* Copyright 2015, Anshuman Khandual, IBM Corporation.
|
||
|
|
*/
|
||
|
|
#include "dscr.h"
|
||
|
|
|
||
|
|
static unsigned long dscr; /* System DSCR default */
|
||
|
|
static unsigned long sequence;
|
||
|
|
static unsigned long result[THREADS];
|
||
|
|
|
||
|
|
static void *do_test(void *in)
|
||
|
|
{
|
||
|
|
unsigned long thread = (unsigned long)in;
|
||
|
|
unsigned long i;
|
||
|
|
|
||
|
|
for (i = 0; i < COUNT; i++) {
|
||
|
|
unsigned long d, cur_dscr, cur_dscr_usr;
|
||
|
|
unsigned long s1, s2;
|
||
|
|
|
||
|
|
s1 = READ_ONCE(sequence);
|
||
|
|
if (s1 & 1)
|
||
|
|
continue;
|
||
|
|
rmb();
|
||
|
|
|
||
|
|
d = dscr;
|
||
|
|
cur_dscr = get_dscr();
|
||
|
|
cur_dscr_usr = get_dscr_usr();
|
||
|
|
|
||
|
|
rmb();
|
||
|
|
s2 = sequence;
|
||
|
|
|
||
|
|
if (s1 != s2)
|
||
|
|
continue;
|
||
|
|
|
||
|
|
if (cur_dscr != d) {
|
||
|
|
fprintf(stderr, "thread %ld kernel DSCR should be %ld "
|
||
|
|
"but is %ld\n", thread, d, cur_dscr);
|
||
|
|
result[thread] = 1;
|
||
|
|
pthread_exit(&result[thread]);
|
||
|
|
}
|
||
|
|
|
||
|
|
if (cur_dscr_usr != d) {
|
||
|
|
fprintf(stderr, "thread %ld user DSCR should be %ld "
|
||
|
|
"but is %ld\n", thread, d, cur_dscr_usr);
|
||
|
|
result[thread] = 1;
|
||
|
|
pthread_exit(&result[thread]);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
result[thread] = 0;
|
||
|
|
pthread_exit(&result[thread]);
|
||
|
|
}
|
||
|
|
|
||
|
|
int dscr_default(void)
|
||
|
|
{
|
||
|
|
pthread_t threads[THREADS];
|
||
|
|
unsigned long i, *status[THREADS];
|
||
|
|
unsigned long orig_dscr_default;
|
||
|
|
|
||
|
|
orig_dscr_default = get_default_dscr();
|
||
|
|
|
||
|
|
/* Initial DSCR default */
|
||
|
|
dscr = 1;
|
||
|
|
set_default_dscr(dscr);
|
||
|
|
|
||
|
|
/* Spawn all testing threads */
|
||
|
|
for (i = 0; i < THREADS; i++) {
|
||
|
|
if (pthread_create(&threads[i], NULL, do_test, (void *)i)) {
|
||
|
|
perror("pthread_create() failed");
|
||
|
|
goto fail;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
srand(getpid());
|
||
|
|
|
||
|
|
/* Keep changing the DSCR default */
|
||
|
|
for (i = 0; i < COUNT; i++) {
|
||
|
|
double ret = uniform_deviate(rand());
|
||
|
|
|
||
|
|
if (ret < 0.0001) {
|
||
|
|
sequence++;
|
||
|
|
wmb();
|
||
|
|
|
||
|
|
dscr++;
|
||
|
|
if (dscr > DSCR_MAX)
|
||
|
|
dscr = 0;
|
||
|
|
|
||
|
|
set_default_dscr(dscr);
|
||
|
|
|
||
|
|
wmb();
|
||
|
|
sequence++;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Individual testing thread exit status */
|
||
|
|
for (i = 0; i < THREADS; i++) {
|
||
|
|
if (pthread_join(threads[i], (void **)&(status[i]))) {
|
||
|
|
perror("pthread_join() failed");
|
||
|
|
goto fail;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (*status[i]) {
|
||
|
|
printf("%ldth thread failed to join with %ld status\n",
|
||
|
|
i, *status[i]);
|
||
|
|
goto fail;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
set_default_dscr(orig_dscr_default);
|
||
|
|
return 0;
|
||
|
|
fail:
|
||
|
|
set_default_dscr(orig_dscr_default);
|
||
|
|
return 1;
|
||
|
|
}
|
||
|
|
|
||
|
|
int main(int argc, char *argv[])
|
||
|
|
{
|
||
|
|
return test_harness(dscr_default, "dscr_default_test");
|
||
|
|
}
|