s390/perf: Improve PMU selection for PERF_COUNT_HW_CPU_CYCLES events

The cpum_cf (counter facility) PMU does not support sampling events.
With cpum_sf (sampling facility), a PMU for sampling CPU cycles is
available.

Make cpum_sf the "default" PMU for PERF_COUNT_HW_CPU_CYCLES sampling
events but use the more precise cpum_cf PMU for non-sampling events.

Signed-off-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

1 files changed, 22 insertions, 4 deletions

diff --git a/arch/s390/kernel/perf_cpum_sf.c b/arch/s390/kernel/perf_cpum_sf.c
index 141eca0917f4..52bf36ee91aa 100644
--- a/arch/s390/kernel/perf_cpum_sf.c
+++ b/arch/s390/kernel/perf_cpum_sf.c
@@ -468,11 +468,29 @@ static int cpumsf_pmu_event_init(struct perf_event *event)
 {
         int err;
 
-        if (event->attr.type != PERF_TYPE_RAW)
-                return -ENOENT;
-
-        if (event->attr.config != PERF_EVENT_CPUM_SF)
+        /* No support for taken branch sampling */
+        if (has_branch_stack(event))
+                return -EOPNOTSUPP;
+
+        switch (event->attr.type) {
+        case PERF_TYPE_RAW:
+                if (event->attr.config != PERF_EVENT_CPUM_SF)
+                        return -ENOENT;
+                break;
+        case PERF_TYPE_HARDWARE:
+                /* Support sampling of CPU cycles in addition to the
+                 * counter facility.  However, the counter facility
+                 * is more precise and, hence, restrict this PMU to
+                 * sampling events only.
+                 */
+                if (event->attr.config != PERF_COUNT_HW_CPU_CYCLES)
+                        return -ENOENT;
+                if (!is_sampling_event(event))
+                        return -ENOENT;
+                break;
+        default:
                 return -ENOENT;
+        }
 
         if (event->cpu >= nr_cpumask_bits ||
             (event->cpu >= 0 && !cpu_online(event->cpu)))