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ebd5858c90
This test continuously updates the system wide DSCR default value in the sysfs interface and makes sure that the same is reflected across all the sysfs interfaces for each individual CPUs present on the system. Acked-by: Shuah Khan <shuahkh@osg.samsung.com> Signed-off-by: Anshuman Khandual <khandual@linux.vnet.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
98 lines
2.0 KiB
C
98 lines
2.0 KiB
C
/*
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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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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published
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* by the Free Software Foundation.
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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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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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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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sprintf(file, "%s%s/dscr", CPU_PATH, dp->d_name);
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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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return 1;
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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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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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