s390/pai_crypto: split function paicrypt_push_sample

Split function paicrypt_push_sample() into two parts. The first part
determines the number of bytes to store as raw data in the perf sample
record. The second part stores the raw data in the perf event's
ring buffer.
No functional change.
Signed-off-by: Thomas Richter <tmricht@linux.ibm.com>
Acked-by: Mete Durlu <meted@linux.ibm.com>
Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>

arch/s390/kernel/perf_pai_crypto.c

@@ -373,8 +373,7 @@ static void paicrypt_del(struct perf_event *event, int flags)
  * 2 bytes: Number of counter
  * 8 bytes: Value of counter
  */
-static size_t paicrypt_copy(struct pai_userdata *userdata,
-			    struct paicrypt_map *cpump,
+static size_t paicrypt_copy(struct pai_userdata *userdata, unsigned long *page,
 			    bool exclude_user, bool exclude_kernel)
 {
 	int i, outidx = 0;
@@ -383,9 +382,9 @@ static size_t paicrypt_copy(struct pai_userdata *userdata,
 		u64 val = 0;
 
 		if (!exclude_kernel)
-			val += paicrypt_getctr(cpump->page, i, true);
+			val += paicrypt_getctr(page, i, true);
 		if (!exclude_user)
-			val += paicrypt_getctr(cpump->page, i, false);
+			val += paicrypt_getctr(page, i, false);
 		if (val) {
 			userdata[outidx].num = i;
 			userdata[outidx].value = val;
@@ -395,25 +394,14 @@ static size_t paicrypt_copy(struct pai_userdata *userdata,
 	return outidx * sizeof(struct pai_userdata);
 }
 
-static int paicrypt_push_sample(void)
+static int paicrypt_push_sample(size_t rawsize, struct paicrypt_map *cpump,
+				struct perf_event *event)
 {
-	struct paicrypt_mapptr *mp = this_cpu_ptr(paicrypt_root.mapptr);
-	struct paicrypt_map *cpump = mp->mapptr;
-	struct perf_event *event = cpump->event;
 	struct perf_sample_data data;
 	struct perf_raw_record raw;
 	struct pt_regs regs;
-	size_t rawsize;
 	int overflow;
 
-	if (!cpump->event)		/* No event active */
-		return 0;
-	rawsize = paicrypt_copy(cpump->save, cpump,
-				cpump->event->attr.exclude_user,
-				cpump->event->attr.exclude_kernel);
-	if (!rawsize)			/* No incremented counters */
-		return 0;
-
 	/* Setup perf sample */
 	memset(&regs, 0, sizeof(regs));
 	memset(&raw, 0, sizeof(raw));
@@ -444,6 +432,25 @@ static int paicrypt_push_sample(void)
 	return overflow;
 }
 
+/* Check if there is data to be saved on schedule out of a task. */
+static int paicrypt_have_sample(void)
+{
+	struct paicrypt_mapptr *mp = this_cpu_ptr(paicrypt_root.mapptr);
+	struct paicrypt_map *cpump = mp->mapptr;
+	struct perf_event *event = cpump->event;
+	size_t rawsize;
+	int rc = 0;
+
+	if (!event)		/* No event active */
+		return 0;
+	rawsize = paicrypt_copy(cpump->save, cpump->page,
+				cpump->event->attr.exclude_user,
+				cpump->event->attr.exclude_kernel);
+	if (rawsize)			/* No incremented counters */
+		rc = paicrypt_push_sample(rawsize, cpump, event);
+	return rc;
+}
+
 /* Called on schedule-in and schedule-out. No access to event structure,
  * but for sampling only event CRYPTO_ALL is allowed.
  */
@@ -453,7 +460,7 @@ static void paicrypt_sched_task(struct perf_event_pmu_context *pmu_ctx, bool sch
 	 * results on schedule_out and if page was dirty, clear values.
 	 */
 	if (!sched_in)
-		paicrypt_push_sample();
+		paicrypt_have_sample();
 }
 
 /* Attribute definitions for paicrypt interface. As with other CPU