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/* SPDX-License-Identifier: GPL-2.0 */
#include <stdlib.h>
#include <bpf/bpf.h>
#include <linux/err.h>
#include <internal/xyarray.h>
#include "util/debug.h"
#include "util/evsel.h"
#include "util/bpf-filter.h"
#include "util/bpf-filter-flex.h"
#include "util/bpf-filter-bison.h"
#include "bpf_skel/sample-filter.h"
#include "bpf_skel/sample_filter.skel.h"
#define FD(e, x, y) (*(int *)xyarray__entry(e->core.fd, x, y))
int perf_bpf_filter__prepare(struct evsel *evsel)
{
int i, x, y, fd;
struct sample_filter_bpf *skel;
struct bpf_program *prog;
struct bpf_link *link;
struct perf_bpf_filter_expr *expr;
skel = sample_filter_bpf__open_and_load();
if (!skel) {
pr_err("Failed to load perf sample-filter BPF skeleton\n");
return -1;
}
i = 0;
fd = bpf_map__fd(skel->maps.filters);
list_for_each_entry(expr, &evsel->bpf_filters, list) {
struct perf_bpf_filter_entry entry = {
.op = expr->op,
.part = expr->part,
.flags = expr->sample_flags,
.value = expr->val,
};
bpf_map_update_elem(fd, &i, &entry, BPF_ANY);
i++;
if (expr->op == PBF_OP_GROUP_BEGIN) {
struct perf_bpf_filter_expr *group;
list_for_each_entry(group, &expr->groups, list) {
struct perf_bpf_filter_entry group_entry = {
.op = group->op,
.part = group->part,
.flags = group->sample_flags,
.value = group->val,
};
bpf_map_update_elem(fd, &i, &group_entry, BPF_ANY);
i++;
}
memset(&entry, 0, sizeof(entry));
entry.op = PBF_OP_GROUP_END;
bpf_map_update_elem(fd, &i, &entry, BPF_ANY);
i++;
}
}
if (i > MAX_FILTERS) {
pr_err("Too many filters: %d (max = %d)\n", i, MAX_FILTERS);
return -1;
}
prog = skel->progs.perf_sample_filter;
for (x = 0; x < xyarray__max_x(evsel->core.fd); x++) {
for (y = 0; y < xyarray__max_y(evsel->core.fd); y++) {
link = bpf_program__attach_perf_event(prog, FD(evsel, x, y));
if (IS_ERR(link)) {
pr_err("Failed to attach perf sample-filter program\n");
return PTR_ERR(link);
}
}
}
evsel->bpf_skel = skel;
return 0;
}
int perf_bpf_filter__destroy(struct evsel *evsel)
{
struct perf_bpf_filter_expr *expr, *tmp;
list_for_each_entry_safe(expr, tmp, &evsel->bpf_filters, list) {
list_del(&expr->list);
free(expr);
}
sample_filter_bpf__destroy(evsel->bpf_skel);
return 0;
}
u64 perf_bpf_filter__lost_count(struct evsel *evsel)
{
struct sample_filter_bpf *skel = evsel->bpf_skel;
return skel ? skel->bss->dropped : 0;
}
struct perf_bpf_filter_expr *perf_bpf_filter_expr__new(unsigned long sample_flags, int part,
enum perf_bpf_filter_op op,
unsigned long val)
{
struct perf_bpf_filter_expr *expr;
expr = malloc(sizeof(*expr));
if (expr != NULL) {
expr->sample_flags = sample_flags;
expr->part = part;
expr->op = op;
expr->val = val;
INIT_LIST_HEAD(&expr->groups);
}
return expr;
}
int perf_bpf_filter__parse(struct list_head *expr_head, const char *str)
{
YY_BUFFER_STATE buffer;
int ret;
buffer = perf_bpf_filter__scan_string(str);
ret = perf_bpf_filter_parse(expr_head);
perf_bpf_filter__flush_buffer(buffer);
perf_bpf_filter__delete_buffer(buffer);
perf_bpf_filter_lex_destroy();
return ret;
}
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