// SPDX-License-Identifier: GPL-2.0-only
|
/*
|
* POWER Data Stream Control Register (DSCR) sysfs thread test
|
*
|
* This test updates the system wide DSCR default value through
|
* sysfs interface which should then update all the CPU specific
|
* DSCR default values which must also be then visible to threads
|
* executing on individual CPUs on the system.
|
*
|
* Copyright 2015, Anshuman Khandual, IBM Corporation.
|
*/
|
#define _GNU_SOURCE
|
#include "dscr.h"
|
|
static int test_thread_dscr(unsigned long val)
|
{
|
unsigned long cur_dscr, cur_dscr_usr;
|
|
cur_dscr = get_dscr();
|
cur_dscr_usr = get_dscr_usr();
|
|
if (val != cur_dscr) {
|
printf("[cpu %d] Kernel DSCR should be %ld but is %ld\n",
|
sched_getcpu(), val, cur_dscr);
|
return 1;
|
}
|
|
if (val != cur_dscr_usr) {
|
printf("[cpu %d] User DSCR should be %ld but is %ld\n",
|
sched_getcpu(), val, cur_dscr_usr);
|
return 1;
|
}
|
return 0;
|
}
|
|
static int check_cpu_dscr_thread(unsigned long val)
|
{
|
cpu_set_t mask;
|
int cpu;
|
|
for (cpu = 0; cpu < CPU_SETSIZE; cpu++) {
|
CPU_ZERO(&mask);
|
CPU_SET(cpu, &mask);
|
if (sched_setaffinity(0, sizeof(mask), &mask))
|
continue;
|
|
if (test_thread_dscr(val))
|
return 1;
|
}
|
return 0;
|
|
}
|
|
int dscr_sysfs_thread(void)
|
{
|
unsigned long orig_dscr_default;
|
int i, j;
|
|
SKIP_IF(!have_hwcap2(PPC_FEATURE2_DSCR));
|
|
orig_dscr_default = get_default_dscr();
|
for (i = 0; i < COUNT; i++) {
|
for (j = 0; j < DSCR_MAX; j++) {
|
set_default_dscr(j);
|
if (check_cpu_dscr_thread(j))
|
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_sysfs_thread, "dscr_sysfs_thread_test");
|
}
|
