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-rw-r--r--tools/testing/selftests/intel_pstate/msr.c40
1 files changed, 40 insertions, 0 deletions
diff --git a/tools/testing/selftests/intel_pstate/msr.c b/tools/testing/selftests/intel_pstate/msr.c
new file mode 100644
index 000000000..88fdd2a4b
--- /dev/null
+++ b/tools/testing/selftests/intel_pstate/msr.c
@@ -0,0 +1,40 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <math.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <sys/timeb.h>
+#include <sched.h>
+#include <errno.h>
+
+
+int main(int argc, char **argv) {
+ int cpu, fd;
+ long long msr;
+ char msr_file_name[64];
+
+ if (argc != 2)
+ return 1;
+
+ errno = 0;
+ cpu = strtol(argv[1], (char **) NULL, 10);
+
+ if (errno)
+ return 1;
+
+ sprintf(msr_file_name, "/dev/cpu/%d/msr", cpu);
+ fd = open(msr_file_name, O_RDONLY);
+
+ if (fd == -1) {
+ perror("Failed to open");
+ return 1;
+ }
+
+ pread(fd, &msr, sizeof(msr), 0x199);
+
+ printf("msr 0x199: 0x%llx\n", msr);
+ return 0;
+}