tools/power turbostat: Provide better debug messages for failed capabilities accesses

turbostat reports some capabilities access errors and not others.  Provide
the same debug message for all errors.

[lenb: remove extra quotes]

Cc: David Arcari <darcari@redhat.com>
Signed-off-by: Prarit Bhargava <prarit@redhat.com>
Signed-off-by: Len Brown <len.brown@intel.com>

diff --git a/tools/power/x86/turbostat/turbostat.8 b/tools/power/x86/turbostat/turbostat.8
index c7b26a3..7dcb4f4 100644 (file)
--- a/tools/power/x86/turbostat/turbostat.8
+++ b/tools/power/x86/turbostat/turbostat.8
@@ -340,7 +340,7 @@ starts a new interval.
 must be run as root.
 Alternatively, non-root users can be enabled to run turbostat this way:
 
-# setcap cap_sys_admin,cap_sys_rawio,cap_sys_nice=+ep ./turbostat
+# setcap cap_sys_admin,cap_sys_rawio,cap_sys_nice=+ep path/to/turbostat
 
 # chmod +r /dev/cpu/*/msr
 

diff --git a/tools/power/x86/turbostat/turbostat.c b/tools/power/x86/turbostat/turbostat.c
index 7ae3086..d246ef6 100644 (file)
--- a/tools/power/x86/turbostat/turbostat.c
+++ b/tools/power/x86/turbostat/turbostat.c
@@ -670,7 +670,8 @@ static int perf_instr_count_open(int cpu_num)
        /* counter for cpu_num, including user + kernel and all processes */
        fd = perf_event_open(&pea, -1, cpu_num, -1, 0);
        if (fd == -1) {
-               warn("cpu%d: perf instruction counter", cpu_num);
+               warnx("capget(CAP_PERFMON) failed, try \"# setcap cap_sys_admin=ep %s\"",
+                     progname);
                BIC_NOT_PRESENT(BIC_IPC);
        }
 
@@ -3502,9 +3503,6 @@ release_msr:
 /*
  * set_my_sched_priority(pri)
  * return previous
- *
- * if non-root, do this:
- * # /sbin/setcap cap_sys_rawio,cap_sys_nice=+ep /usr/bin/turbostat
  */
 int set_my_sched_priority(int priority)
 {
@@ -3518,7 +3516,8 @@ int set_my_sched_priority(int priority)
 
        retval = setpriority(PRIO_PROCESS, 0, priority);
        if (retval)
-               err(retval, "setpriority(%d)", priority);
+               errx(retval, "capget(CAP_SYS_NICE) failed,try \"# setcap cap_sys_nice=ep %s\"",
+                    progname);
 
        errno = 0;
        retval = getpriority(PRIO_PROCESS, 0);
@@ -5476,7 +5475,8 @@ void print_dev_latency(void)
 
        fd = open(path, O_RDONLY);
        if (fd < 0) {
-               warn("fopen %s\n", path);
+               warnx("capget(CAP_SYS_ADMIN) failed, try \"# setcap cap_sys_admin=ep %s\"",
+                     progname);
                return;
        }