提交 ebd5858c 编写于 作者: A Anshuman Khandual 提交者: Michael Ellerman

selftests/powerpc: Add test for all DSCR sysfs interfaces

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: NShuah Khan <shuahkh@osg.samsung.com>
Signed-off-by: NAnshuman Khandual <khandual@linux.vnet.ibm.com>
Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>
上级 6f844261
TEST_PROGS := dscr_default_test dscr_explicit_test dscr_user_test \
dscr_inherit_test dscr_inherit_exec_test
dscr_inherit_test dscr_inherit_exec_test dscr_sysfs_test
dscr_default_test: LDLIBS += -lpthread
......
/*
* 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.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published
* by the Free Software Foundation.
*/
#include "dscr.h"
static int check_cpu_dscr_default(char *file, unsigned long val)
{
char buf[10];
int fd, rc;
fd = open(file, O_RDWR);
if (fd == -1) {
perror("open() failed");
return 1;
}
rc = read(fd, buf, sizeof(buf));
if (rc == -1) {
perror("read() failed");
return 1;
}
close(fd);
buf[rc] = '\0';
if (strtol(buf, NULL, 16) != val) {
printf("DSCR match failed: %ld (system) %ld (cpu)\n",
val, strtol(buf, NULL, 16));
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))) {
if (!(dp->d_type & DT_DIR))
continue;
if (!strcmp(dp->d_name, "cpuidle"))
continue;
if (!strstr(dp->d_name, "cpu"))
continue;
sprintf(file, "%s%s/dscr", CPU_PATH, dp->d_name);
if (access(file, F_OK))
continue;
if (check_cpu_dscr_default(file, val))
return 1;
}
closedir(sysfs);
return 0;
}
int dscr_sysfs(void)
{
unsigned long orig_dscr_default;
int i, j;
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_all_cpu_dscr_defaults(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, "dscr_sysfs_test");
}
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