From e09b41010ba33a20a87472ee821fa407a5b8da36 Mon Sep 17 00:00:00 2001 From: José Pekkarinen Date: Mon, 11 Apr 2016 10:41:07 +0300 Subject: These changes are the raw update to linux-4.4.6-rt14. Kernel sources are taken from kernel.org, and rt patch from the rt wiki download page. MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit During the rebasing, the following patch collided: Force tick interrupt and get rid of softirq magic(I70131fb85). Collisions have been removed because its logic was found on the source already. Change-Id: I7f57a4081d9deaa0d9ccfc41a6c8daccdee3b769 Signed-off-by: José Pekkarinen --- .../selftests/powerpc/dscr/dscr_sysfs_test.c | 97 ++++++++++++++++++++++ 1 file changed, 97 insertions(+) create mode 100644 kernel/tools/testing/selftests/powerpc/dscr/dscr_sysfs_test.c (limited to 'kernel/tools/testing/selftests/powerpc/dscr/dscr_sysfs_test.c') diff --git a/kernel/tools/testing/selftests/powerpc/dscr/dscr_sysfs_test.c b/kernel/tools/testing/selftests/powerpc/dscr/dscr_sysfs_test.c new file mode 100644 index 000000000..17fb1b43c --- /dev/null +++ b/kernel/tools/testing/selftests/powerpc/dscr/dscr_sysfs_test.c @@ -0,0 +1,97 @@ +/* + * 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"); +} -- cgit 1.2.3-korg