perf dlfilter: Add machine_pid and vcpu

Add machine_pid and vcpu to struct perf_dlfilter_sample. The 'size' can be
used to determine if the values are present, however machine_pid is zero if
unused in any case. vcpu should be ignored if machine_pid is zero.
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Acked-by: Ian Rogers <irogers@google.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: kvm@vger.kernel.org
Link: https://lore.kernel.org/r/20220711093218.10967-17-adrian.hunter@intel.comSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/Documentation/perf-dlfilter.txt

@@ -107,9 +107,31 @@ struct perf_dlfilter_sample {
 	__u64 raw_callchain_nr;	/* Number of raw_callchain entries */
 	const __u64 *raw_callchain; /* Refer <linux/perf_event.h> */
 	const char *event;
+	__s32 machine_pid;
+	__s32 vcpu;
 };
 ----
 
+Note: 'machine_pid' and 'vcpu' are not original members, but were added together later.
+'size' can be used to determine their presence at run time.
+PERF_DLFILTER_HAS_MACHINE_PID will be defined if they are present at compile time.
+For example:
+[source,c]
+----
+#include <perf/perf_dlfilter.h>
+#include <stddef.h>
+#include <stdbool.h>
+
+static inline bool have_machine_pid(const struct perf_dlfilter_sample *sample)
+{
+#ifdef PERF_DLFILTER_HAS_MACHINE_PID
+	return sample->size >= offsetof(struct perf_dlfilter_sample, vcpu) + sizeof(sample->vcpu);
+#else
+	return false;
+#endif
+}
+----
+
 The perf_dlfilter_fns structure
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 

tools/perf/include/perf/perf_dlfilter.h

@@ -9,6 +9,12 @@
 #include <linux/perf_event.h>
 #include <linux/types.h>
 
+/*
+ * The following macro can be used to determine if this header defines
+ * perf_dlfilter_sample machine_pid and vcpu.
+ */
+#define PERF_DLFILTER_HAS_MACHINE_PID
+
 /* Definitions for perf_dlfilter_sample flags */
 enum {
 	PERF_DLFILTER_FLAG_BRANCH	= 1ULL << 0,
@@ -62,6 +68,8 @@ struct perf_dlfilter_sample {
 	__u64 raw_callchain_nr;	/* Number of raw_callchain entries */
 	const __u64 *raw_callchain; /* Refer <linux/perf_event.h> */
 	const char *event;
+	__s32 machine_pid;
+	__s32 vcpu;
 };
 
 /*

tools/perf/util/dlfilter.c

@@ -495,6 +495,8 @@ int dlfilter__do_filter_event(struct dlfilter *d,
 	ASSIGN(misc);
 	ASSIGN(raw_size);
 	ASSIGN(raw_data);
+	ASSIGN(machine_pid);
+	ASSIGN(vcpu);
 
 	if (sample->branch_stack) {
 		d_sample.brstack_nr = sample->branch_stack->nr;