selftests/powerpc/pmu: Add event_init_sampling function

Extended event_init_opts() to include initialization of sampling
testcases. Patch adds an event_init_sampling() wrapper to initialize
event attribute fields for sampling events. This includes initializing
sample period, sample type and event type.

Signed-off-by: Madhavan Srinivasan <[e-mail]>
Signed-off-by: Michael Ellerman <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]

tools/testing/selftests/powerpc/pmu/event.c

···
 #include <sys/syscall.h>
 #include <string.h>
 #include <stdio.h>
+#include <stdbool.h>
 #include <sys/ioctl.h>
 
 #include "event.h"
···
 			   group_fd, flags);
 }
 
-void event_init_opts(struct event *e, u64 config, int type, char *name)
+static void  __event_init_opts(struct event *e, u64 config,
+			       int type, char *name, bool sampling)
 {
 	memset(e, 0, sizeof(*e));
 
···
 	/* This has to match the structure layout in the header */
 	e->attr.read_format = PERF_FORMAT_TOTAL_TIME_ENABLED | \
 				  PERF_FORMAT_TOTAL_TIME_RUNNING;
+	if (sampling) {
+		e->attr.sample_period = 1000;
+		e->attr.sample_type = PERF_SAMPLE_REGS_INTR;
+		e->attr.disabled = 1;
+	}
+}
+
+void event_init_opts(struct event *e, u64 config, int type, char *name)
+{
+	__event_init_opts(e, config, type, name, false);
 }
 
 void event_init_named(struct event *e, u64 config, char *name)
···
 void event_init(struct event *e, u64 config)
 {
 	event_init_opts(e, config, PERF_TYPE_RAW, "event");
+}
+
+void event_init_sampling(struct event *e, u64 config)
+{
+	__event_init_opts(e, config, PERF_TYPE_RAW, "event", true);
 }
 
 #define PERF_CURRENT_PID	0

tools/testing/selftests/powerpc/pmu/event.h

···
 void event_init(struct event *e, u64 config);
 void event_init_named(struct event *e, u64 config, char *name);
 void event_init_opts(struct event *e, u64 config, int type, char *name);
+void event_init_sampling(struct event *e, u64 config);
 int event_open_with_options(struct event *e, pid_t pid, int cpu, int group_fd);
 int event_open_with_group(struct event *e, int group_fd);
 int event_open_with_pid(struct event *e, pid_t pid);