1 files changed, 330 insertions, 0 deletions
diff --git a/tools/perf/util/dlfilter.c b/tools/perf/util/dlfilter.c
new file mode 100644
index 000000000000..03c4bf150656
--- /dev/null
+++ b/tools/perf/util/dlfilter.c
@@ -0,0 +1,330 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * dlfilter.c: Interface to perf script --dlfilter shared object
+ * Copyright (c) 2021, Intel Corporation.
+ */
+#include <dlfcn.h>
+#include <stdlib.h>
+#include <string.h>
+#include <linux/zalloc.h>
+#include <linux/build_bug.h>
+
+#include "debug.h"
+#include "event.h"
+#include "evsel.h"
+#include "dso.h"
+#include "map.h"
+#include "thread.h"
+#include "symbol.h"
+#include "dlfilter.h"
+#include "perf_dlfilter.h"
+
+static void al_to_d_al(struct addr_location *al, struct perf_dlfilter_al *d_al)
+{
+	struct symbol *sym = al->sym;
+
+	d_al->size = sizeof(*d_al);
+	if (al->map) {
+		struct dso *dso = al->map->dso;
+
+		if (symbol_conf.show_kernel_path && dso->long_name)
+			d_al->dso = dso->long_name;
+		else
+			d_al->dso = dso->name;
+		d_al->is_64_bit = dso->is_64_bit;
+		d_al->buildid_size = dso->bid.size;
+		d_al->buildid = dso->bid.data;
+	} else {
+		d_al->dso = NULL;
+		d_al->is_64_bit = 0;
+		d_al->buildid_size = 0;
+		d_al->buildid = NULL;
+	}
+	if (sym) {
+		d_al->sym = sym->name;
+		d_al->sym_start = sym->start;
+		d_al->sym_end = sym->end;
+		if (al->addr < sym->end)
+			d_al->symoff = al->addr - sym->start;
+		else
+			d_al->symoff = al->addr - al->map->start - sym->start;
+		d_al->sym_binding = sym->binding;
+	} else {
+		d_al->sym = NULL;
+		d_al->sym_start = 0;
+		d_al->sym_end = 0;
+		d_al->symoff = 0;
+		d_al->sym_binding = 0;
+	}
+	d_al->addr = al->addr;
+	d_al->comm = NULL;
+	d_al->filtered = 0;
+}
+
+static struct addr_location *get_al(struct dlfilter *d)
+{
+	struct addr_location *al = d->al;
+
+	if (!al->thread && machine__resolve(d->machine, al, d->sample) < 0)
+		return NULL;
+	return al;
+}
+
+static struct thread *get_thread(struct dlfilter *d)
+{
+	struct addr_location *al = get_al(d);
+
+	return al ? al->thread : NULL;
+}
+
+static const struct perf_dlfilter_al *dlfilter__resolve_ip(void *ctx)
+{
+	struct dlfilter *d = (struct dlfilter *)ctx;
+	struct perf_dlfilter_al *d_al = d->d_ip_al;
+	struct addr_location *al;
+
+	if (!d->ctx_valid)
+		return NULL;
+
+	/* 'size' is also used to indicate already initialized */
+	if (d_al->size)
+		return d_al;
+
+	al = get_al(d);
+	if (!al)
+		return NULL;
+
+	al_to_d_al(al, d_al);
+
+	d_al->is_kernel_ip = machine__kernel_ip(d->machine, d->sample->ip);
+	d_al->comm = al->thread ? thread__comm_str(al->thread) : ":-1";
+	d_al->filtered = al->filtered;
+
+	return d_al;
+}
+
+static const struct perf_dlfilter_al *dlfilter__resolve_addr(void *ctx)
+{
+	struct dlfilter *d = (struct dlfilter *)ctx;
+	struct perf_dlfilter_al *d_addr_al = d->d_addr_al;
+	struct addr_location *addr_al = d->addr_al;
+
+	if (!d->ctx_valid || !d->d_sample->addr_correlates_sym)
+		return NULL;
+
+	/* 'size' is also used to indicate already initialized */
+	if (d_addr_al->size)
+		return d_addr_al;
+
+	if (!addr_al->thread) {
+		struct thread *thread = get_thread(d);
+
+		if (!thread)
+			return NULL;
+		thread__resolve(thread, addr_al, d->sample);
+	}
+
+	al_to_d_al(addr_al, d_addr_al);
+
+	d_addr_al->is_kernel_ip = machine__kernel_ip(d->machine, d->sample->addr);
+
+	return d_addr_al;
+}
+
+static const struct perf_dlfilter_fns perf_dlfilter_fns = {
+	.resolve_ip      = dlfilter__resolve_ip,
+	.resolve_addr    = dlfilter__resolve_addr,
+};
+
+#define CHECK_FLAG(x) BUILD_BUG_ON((u64)PERF_DLFILTER_FLAG_ ## x != (u64)PERF_IP_FLAG_ ## x)
+
+static int dlfilter__init(struct dlfilter *d, const char *file)
+{
+	CHECK_FLAG(BRANCH);
+	CHECK_FLAG(CALL);
+	CHECK_FLAG(RETURN);
+	CHECK_FLAG(CONDITIONAL);
+	CHECK_FLAG(SYSCALLRET);
+	CHECK_FLAG(ASYNC);
+	CHECK_FLAG(INTERRUPT);
+	CHECK_FLAG(TX_ABORT);
+	CHECK_FLAG(TRACE_BEGIN);
+	CHECK_FLAG(TRACE_END);
+	CHECK_FLAG(IN_TX);
+	CHECK_FLAG(VMENTRY);
+	CHECK_FLAG(VMEXIT);
+
+	memset(d, 0, sizeof(*d));
+	d->file = strdup(file);
+	if (!d->file)
+		return -1;
+	return 0;
+}
+
+static void dlfilter__exit(struct dlfilter *d)
+{
+	zfree(&d->file);
+}
+
+static int dlfilter__open(struct dlfilter *d)
+{
+	d->handle = dlopen(d->file, RTLD_NOW);
+	if (!d->handle) {
+		pr_err("dlopen failed for: '%s'\n", d->file);
+		return -1;
+	}
+	d->start = dlsym(d->handle, "start");
+	d->filter_event = dlsym(d->handle, "filter_event");
+	d->stop = dlsym(d->handle, "stop");
+	d->fns = dlsym(d->handle, "perf_dlfilter_fns");
+	if (d->fns)
+		memcpy(d->fns, &perf_dlfilter_fns, sizeof(struct perf_dlfilter_fns));
+	return 0;
+}
+
+static int dlfilter__close(struct dlfilter *d)
+{
+	return dlclose(d->handle);
+}
+
+struct dlfilter *dlfilter__new(const char *file)
+{
+	struct dlfilter *d = malloc(sizeof(*d));
+
+	if (!d)
+		return NULL;
+
+	if (dlfilter__init(d, file))
+		goto err_free;
+
+	if (dlfilter__open(d))
+		goto err_exit;
+
+	return d;
+
+err_exit:
+	dlfilter__exit(d);
+err_free:
+	free(d);
+	return NULL;
+}
+
+static void dlfilter__free(struct dlfilter *d)
+{
+	if (d) {
+		dlfilter__exit(d);
+		free(d);
+	}
+}
+
+int dlfilter__start(struct dlfilter *d, struct perf_session *session)
+{
+	if (d) {
+		d->session = session;
+		if (d->start)
+			return d->start(&d->data, d);
+	}
+	return 0;
+}
+
+static int dlfilter__stop(struct dlfilter *d)
+{
+	if (d && d->stop)
+		return d->stop(d->data, d);
+	return 0;
+}
+
+void dlfilter__cleanup(struct dlfilter *d)
+{
+	if (d) {
+		dlfilter__stop(d);
+		dlfilter__close(d);
+		dlfilter__free(d);
+	}
+}
+
+#define ASSIGN(x) d_sample.x = sample->x
+
+int dlfilter__do_filter_event(struct dlfilter *d,
+			      union perf_event *event,
+			      struct perf_sample *sample,
+			      struct evsel *evsel,
+			      struct machine *machine,
+			      struct addr_location *al,
+			      struct addr_location *addr_al)
+{
+	struct perf_dlfilter_sample d_sample;
+	struct perf_dlfilter_al d_ip_al;
+	struct perf_dlfilter_al d_addr_al;
+	int ret;
+
+	d->event       = event;
+	d->sample      = sample;
+	d->evsel       = evsel;
+	d->machine     = machine;
+	d->al          = al;
+	d->addr_al     = addr_al;
+	d->d_sample    = &d_sample;
+	d->d_ip_al     = &d_ip_al;
+	d->d_addr_al   = &d_addr_al;
+
+	d_sample.size  = sizeof(d_sample);
+	d_ip_al.size   = 0; /* To indicate d_ip_al is not initialized */
+	d_addr_al.size = 0; /* To indicate d_addr_al is not initialized */
+
+	ASSIGN(ip);
+	ASSIGN(pid);
+	ASSIGN(tid);
+	ASSIGN(time);
+	ASSIGN(addr);
+	ASSIGN(id);
+	ASSIGN(stream_id);
+	ASSIGN(period);
+	ASSIGN(weight);
+	ASSIGN(ins_lat);
+	ASSIGN(p_stage_cyc);
+	ASSIGN(transaction);
+	ASSIGN(insn_cnt);
+	ASSIGN(cyc_cnt);
+	ASSIGN(cpu);
+	ASSIGN(flags);
+	ASSIGN(data_src);
+	ASSIGN(phys_addr);
+	ASSIGN(data_page_size);
+	ASSIGN(code_page_size);
+	ASSIGN(cgroup);
+	ASSIGN(cpumode);
+	ASSIGN(misc);
+	ASSIGN(raw_size);
+	ASSIGN(raw_data);
+
+	if (sample->branch_stack) {
+		d_sample.brstack_nr = sample->branch_stack->nr;
+		d_sample.brstack = (struct perf_branch_entry *)perf_sample__branch_entries(sample);
+	} else {
+		d_sample.brstack_nr = 0;
+		d_sample.brstack = NULL;
+	}
+
+	if (sample->callchain) {
+		d_sample.raw_callchain_nr = sample->callchain->nr;
+		d_sample.raw_callchain = (__u64 *)sample->callchain->ips;
+	} else {
+		d_sample.raw_callchain_nr = 0;
+		d_sample.raw_callchain = NULL;
+	}
+
+	d_sample.addr_correlates_sym =
+		(evsel->core.attr.sample_type & PERF_SAMPLE_ADDR) &&
+		sample_addr_correlates_sym(&evsel->core.attr);
+
+	d_sample.event = evsel__name(evsel);
+
+	d->ctx_valid = true;
+
+	ret = d->filter_event(d->data, &d_sample, d);
+
+	d->ctx_valid = false;
+
+	return ret;
+}