s390/pai_crypto: Add common pai_stop() function

To support one common PAI PMU device driver which handles
both PMUs pai_crypto and pai_ext, use a common naming scheme
for structures and variables suitable for both device drivers.

Add a common usable function pai_stop() for the event on a CPU.
Call this common pai_stop() from paicrypt_del().

Signed-off-by: Thomas Richter <tmricht@linux.ibm.com>
Reviewed-by: Jan Polensky <japo@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>

Author: Thomas Richter

arch/s390/kernel/perf_pai_crypto.c

@@ -435,13 +435,14 @@ static int paicrypt_add(struct perf_event *event, int flags)
 }
 
 static void pai_have_sample(struct perf_event *, struct pai_map *);
-static void paicrypt_stop(struct perf_event *event, int flags)
+static void pai_stop(struct perf_event *event, int flags)
 {
 	struct pai_mapptr *mp = this_cpu_ptr(pai_root.mapptr);
 	struct pai_map *cpump = mp->mapptr;
+	int idx = PAI_PMU_IDX(event);
 
 	if (!event->attr.sample_period) {	/* Counting */
-		paicrypt_read(event);
+		pai_pmu[idx].pmu->read(event);
 	} else {				/* Sampling */
 		if (!(event->attach_state & PERF_ATTACH_TASK)) {
 			perf_sched_cb_dec(event->pmu);
@@ -454,6 +455,11 @@ static void paicrypt_stop(struct perf_event *event, int flags)
 	event->hw.state = PERF_HES_STOPPED;
 }
 
+static void paicrypt_stop(struct perf_event *event, int flags)
+{
+	pai_stop(event, flags);
+}
+
 static void paicrypt_del(struct perf_event *event, int flags)
 {
 	struct pai_mapptr *mp = this_cpu_ptr(pai_root.mapptr);