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