// SPDX-License-Identifier: GPL-2.0-only
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/*
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* POWER Data Stream Control Register (DSCR) sysfs interface test
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*
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* This test updates to system wide DSCR default through the sysfs interface
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* and then verifies that all the CPU specific DSCR defaults are updated as
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* well verified from their sysfs interfaces.
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*
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* Copyright 2015, Anshuman Khandual, IBM Corporation.
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*/
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#include "dscr.h"
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static int check_cpu_dscr_default(char *file, unsigned long val)
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{
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char buf[10];
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int fd, rc;
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fd = open(file, O_RDWR);
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if (fd == -1) {
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perror("open() failed");
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return 1;
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}
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rc = read(fd, buf, sizeof(buf));
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if (rc == -1) {
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perror("read() failed");
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close(fd);
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return 1;
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}
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close(fd);
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buf[rc] = '\0';
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if (strtol(buf, NULL, 16) != val) {
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printf("DSCR match failed: %ld (system) %ld (cpu)\n",
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val, strtol(buf, NULL, 16));
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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_all_cpu_dscr_defaults(unsigned long val)
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{
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DIR *sysfs;
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struct dirent *dp;
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char file[LEN_MAX];
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sysfs = opendir(CPU_PATH);
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if (!sysfs) {
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perror("opendir() failed");
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return 1;
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}
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while ((dp = readdir(sysfs))) {
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int len;
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if (!(dp->d_type & DT_DIR))
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continue;
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if (!strcmp(dp->d_name, "cpuidle"))
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continue;
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if (!strstr(dp->d_name, "cpu"))
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continue;
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len = snprintf(file, LEN_MAX, "%s%s/dscr", CPU_PATH, dp->d_name);
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if (len >= LEN_MAX)
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continue;
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if (access(file, F_OK))
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continue;
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if (check_cpu_dscr_default(file, val)) {
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closedir(sysfs);
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return 1;
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}
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}
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closedir(sysfs);
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return 0;
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}
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int dscr_sysfs(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_all_cpu_dscr_defaults(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, "dscr_sysfs_test");
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}
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