Messages in this thread Patch in this message | | | From | Jiri Olsa <> | Subject | [PATCH 12/13] perf bpf: Run begin/end programs | Date | Mon, 12 Mar 2018 10:43:12 +0100 |
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Running begin and end programs for ebpf object.
Link: http://lkml.kernel.org/n/tip-ego7m00cr7sru8l5bjpjwwcm@git.kernel.org Signed-off-by: Jiri Olsa <jolsa@kernel.org> --- tools/perf/builtin-bpf.c | 6 ++++ tools/perf/util/bpf-loader.c | 78 ++++++++++++++++++++++++++++++++++++++++++++ tools/perf/util/bpf-loader.h | 2 ++ 3 files changed, 86 insertions(+)
diff --git a/tools/perf/builtin-bpf.c b/tools/perf/builtin-bpf.c index 7065153a9577..1111e240e259 100644 --- a/tools/perf/builtin-bpf.c +++ b/tools/perf/builtin-bpf.c @@ -94,6 +94,10 @@ static int __cmd_bpf(int argc , const char **argv) goto out_child; } + err = bpf__run_begin(stdout); + if (err) + goto out_child; + if (forks) { perf_evlist__start_workload(bpf.evlist); @@ -115,6 +119,8 @@ static int __cmd_bpf(int argc , const char **argv) child_pid = -1; + bpf__run_end(stdout); + out_child: if (forks) { if (workload_exec_errno) { diff --git a/tools/perf/util/bpf-loader.c b/tools/perf/util/bpf-loader.c index e59168153375..d5f9c3cd5280 100644 --- a/tools/perf/util/bpf-loader.c +++ b/tools/perf/util/bpf-loader.c @@ -9,6 +9,7 @@ #include <linux/bpf.h> #include <bpf/libbpf.h> #include <bpf/bpf.h> +#include <bpf/interp.h> #include <linux/err.h> #include <linux/kernel.h> #include <linux/string.h> @@ -23,6 +24,7 @@ #include "strfilter.h" #include "llvm-utils.h" #include "c++/clang-c.h" +#include "bpf-userapi.h" #define DEFINE_PRINT_FN(name, level) \ static int libbpf_##name(const char *fmt, ...) \ @@ -1547,6 +1549,82 @@ int bpf__apply_obj_config(void) return 0; } +struct interp { + struct bpf_interp in; + FILE *out; +}; + +static int bpf_interp_call_cb(struct bpf_interp *in, + u64 imm, u64 *regs) +{ + struct interp *interp = container_of(in, struct interp, in); + u64 dr; + + switch (imm) { + case BPF_FUNC_USER_bpf_map_lookup_elem: + dr = bpf_map_lookup_elem((int) regs[1], + (void *) regs[2], + (void *) regs[3]); + break; + case BPF_FUNC_USER_bpf_map_get_next_key: + dr = bpf_map_get_next_key((int) regs[1], + (void *) regs[2], + (void *) regs[3]); + break; + case BPF_FUNC_USER_print: + dr = fprintf(interp->out, (const char *) regs[1], + regs[2], regs[3], regs[4], regs[5]); + fflush(interp->out); + break; + default: + return -1; + break; + }; + + regs[0] = dr; + regs[1] = 0xdeadbeef; + regs[2] = 0xdeadbeef; + regs[3] = 0xdeadbeef; + regs[4] = 0xdeadbeef; + return 0; +} + +int bpf__run_begin(FILE *out) +{ + struct interp interp = { + .in.call_cb = bpf_interp_call_cb, + .out = out, + }; + struct bpf_object *obj, *tmp; + int err; + + bpf_object__for_each_safe(obj, tmp) { + err = bpf_object__run_begin(obj, &interp.in); + if (err) + return err; + } + + return 0; +} + +int bpf__run_end(FILE *out) +{ + struct interp interp = { + .in.call_cb = bpf_interp_call_cb, + .out = out, + }; + struct bpf_object *obj, *tmp; + int err; + + bpf_object__for_each_safe(obj, tmp) { + err = bpf_object__run_end(obj, &interp.in); + if (err) + return err; + } + + return 0; +} + #define bpf__for_each_map(pos, obj, objtmp) \ bpf_object__for_each_safe(obj, objtmp) \ bpf_map__for_each(pos, obj) diff --git a/tools/perf/util/bpf-loader.h b/tools/perf/util/bpf-loader.h index 8c2a494cab53..1ee4c3ca4927 100644 --- a/tools/perf/util/bpf-loader.h +++ b/tools/perf/util/bpf-loader.h @@ -87,6 +87,8 @@ int bpf__setup_stdout(struct perf_evlist *evlist); int bpf__strerror_setup_stdout(struct perf_evlist *evlist, int err, char *buf, size_t size); +int bpf__run_begin(FILE *out); +int bpf__run_end(FILE *out); #else #include <errno.h> -- 2.13.6
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