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// SPDX-License-Identifier: GPL-2.0-only
/*
* POWER Data Stream Control Register (DSCR) sysfs interface test
*
* This test updates to system wide DSCR default through the sysfs interface
* and then verifies that all the CPU specific DSCR defaults are updated as
* well verified from their sysfs interfaces.
*
* Copyright 2015, Anshuman Khandual, IBM Corporation.
*/
#include "dscr.h"
static int check_cpu_dscr_default(char *file, unsigned long val)
{
unsigned long cpu_dscr;
int err;
err = read_ulong(file, &cpu_dscr, 16);
if (err)
return err;
if (cpu_dscr != val) {
printf("DSCR match failed: %ld (system) %ld (cpu)\n",
val, cpu_dscr);
return 1;
}
return 0;
}
static int check_all_cpu_dscr_defaults(unsigned long val)
{
DIR *sysfs;
struct dirent *dp;
char file[LEN_MAX];
sysfs = opendir(CPU_PATH);
if (!sysfs) {
perror("opendir() failed");
return 1;
}
while ((dp = readdir(sysfs))) {
int len;
if (!(dp->d_type & DT_DIR))
continue;
if (!strcmp(dp->d_name, "cpuidle"))
continue;
if (!strstr(dp->d_name, "cpu"))
continue;
len = snprintf(file, LEN_MAX, "%s%s/dscr", CPU_PATH, dp->d_name);
if (len >= LEN_MAX)
continue;
if (access(file, F_OK))
continue;
if (check_cpu_dscr_default(file, val)) {
closedir(sysfs);
return 1;
}
}
closedir(sysfs);
return 0;
}
int dscr_sysfs(void)
{
unsigned long orig_dscr_default;
SKIP_IF(!have_hwcap2(PPC_FEATURE2_DSCR));
orig_dscr_default = get_default_dscr();
for (int i = 0; i < DSCR_MAX; i++) {
set_default_dscr(i);
if (check_all_cpu_dscr_defaults(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_sysfs, "dscr_sysfs_test");
}
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