[18/18] perf annotate: Add base support for bpf_image
diff mbox series

Message ID 20200226130345.209469-19-jolsa@kernel.org
State Changes Requested
Delegated to: BPF Maintainers
Headers show
Series
  • bpf: Add trampoline and dispatcher to /proc/kallsyms
Related show

Commit Message

Jiri Olsa Feb. 26, 2020, 1:03 p.m. UTC
Adding the DSO_BINARY_TYPE__BPF_IMAGE dso binary type
to recognize bpf images that carry trampoline or dispatcher.

Upcoming patches will add support to read the image data,
store it within the BPF feature in perf.data and display
it for annotation purposes.

Currently we only display following message:

  # ./perf annotate bpf_trampoline_24456 --stdio
   Percent |      Source code & Disassembly of . for cycles (504  ...
  --------------------------------------------------------------- ...
           :       to be implemented

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
---
 tools/perf/util/annotate.c | 20 ++++++++++++++++++++
 tools/perf/util/dso.c      |  1 +
 tools/perf/util/dso.h      |  1 +
 tools/perf/util/machine.c  | 11 +++++++++++
 tools/perf/util/symbol.c   |  1 +
 5 files changed, 34 insertions(+)

Comments

Song Liu Feb. 27, 2020, 5:54 a.m. UTC | #1
On Wed, Feb 26, 2020 at 5:06 AM Jiri Olsa <jolsa@kernel.org> wrote:
>
> Adding the DSO_BINARY_TYPE__BPF_IMAGE dso binary type
> to recognize bpf images that carry trampoline or dispatcher.
>
> Upcoming patches will add support to read the image data,
> store it within the BPF feature in perf.data and display
> it for annotation purposes.
>
> Currently we only display following message:
>
>   # ./perf annotate bpf_trampoline_24456 --stdio
>    Percent |      Source code & Disassembly of . for cycles (504  ...
>   --------------------------------------------------------------- ...
>            :       to be implemented
>
> Signed-off-by: Jiri Olsa <jolsa@kernel.org>

Acked-by: Song Liu <songliubraving@fb.com>
Arnaldo Carvalho de Melo Feb. 28, 2020, 1:16 p.m. UTC | #2
Em Wed, Feb 26, 2020 at 02:03:45PM +0100, Jiri Olsa escreveu:
> Adding the DSO_BINARY_TYPE__BPF_IMAGE dso binary type
> to recognize bpf images that carry trampoline or dispatcher.
> 
> Upcoming patches will add support to read the image data,
> store it within the BPF feature in perf.data and display
> it for annotation purposes.
> 
> Currently we only display following message:

Acked-by: Arnaldo Carvalho de Melo <acme@redhat.com>
 
>   # ./perf annotate bpf_trampoline_24456 --stdio
>    Percent |      Source code & Disassembly of . for cycles (504  ...
>   --------------------------------------------------------------- ...
>            :       to be implemented
> 
> Signed-off-by: Jiri Olsa <jolsa@kernel.org>
> ---
>  tools/perf/util/annotate.c | 20 ++++++++++++++++++++
>  tools/perf/util/dso.c      |  1 +
>  tools/perf/util/dso.h      |  1 +
>  tools/perf/util/machine.c  | 11 +++++++++++
>  tools/perf/util/symbol.c   |  1 +
>  5 files changed, 34 insertions(+)
> 
> diff --git a/tools/perf/util/annotate.c b/tools/perf/util/annotate.c
> index ca73fb74ad03..d9e606e11936 100644
> --- a/tools/perf/util/annotate.c
> +++ b/tools/perf/util/annotate.c
> @@ -1843,6 +1843,24 @@ static int symbol__disassemble_bpf(struct symbol *sym __maybe_unused,
>  }
>  #endif // defined(HAVE_LIBBFD_SUPPORT) && defined(HAVE_LIBBPF_SUPPORT)
>  
> +static int
> +symbol__disassemble_bpf_image(struct symbol *sym,
> +			      struct annotate_args *args)
> +{
> +	struct annotation *notes = symbol__annotation(sym);
> +	struct disasm_line *dl;
> +
> +	args->offset = -1;
> +	args->line = strdup("to be implemented");
> +	args->line_nr = 0;
> +	dl = disasm_line__new(args);
> +	if (dl)
> +		annotation_line__add(&dl->al, &notes->src->source);
> +
> +	free(args->line);
> +	return 0;
> +}
> +
>  /*
>   * Possibly create a new version of line with tabs expanded. Returns the
>   * existing or new line, storage is updated if a new line is allocated. If
> @@ -1942,6 +1960,8 @@ static int symbol__disassemble(struct symbol *sym, struct annotate_args *args)
>  
>  	if (dso->binary_type == DSO_BINARY_TYPE__BPF_PROG_INFO) {
>  		return symbol__disassemble_bpf(sym, args);
> +	} else if (dso->binary_type == DSO_BINARY_TYPE__BPF_IMAGE) {
> +		return symbol__disassemble_bpf_image(sym, args);
>  	} else if (dso__is_kcore(dso)) {
>  		kce.kcore_filename = symfs_filename;
>  		kce.addr = map__rip_2objdump(map, sym->start);
> diff --git a/tools/perf/util/dso.c b/tools/perf/util/dso.c
> index 91f21239608b..f338990e0fe6 100644
> --- a/tools/perf/util/dso.c
> +++ b/tools/perf/util/dso.c
> @@ -191,6 +191,7 @@ int dso__read_binary_type_filename(const struct dso *dso,
>  	case DSO_BINARY_TYPE__GUEST_KALLSYMS:
>  	case DSO_BINARY_TYPE__JAVA_JIT:
>  	case DSO_BINARY_TYPE__BPF_PROG_INFO:
> +	case DSO_BINARY_TYPE__BPF_IMAGE:
>  	case DSO_BINARY_TYPE__NOT_FOUND:
>  		ret = -1;
>  		break;
> diff --git a/tools/perf/util/dso.h b/tools/perf/util/dso.h
> index 2db64b79617a..9553a1fd9e8a 100644
> --- a/tools/perf/util/dso.h
> +++ b/tools/perf/util/dso.h
> @@ -40,6 +40,7 @@ enum dso_binary_type {
>  	DSO_BINARY_TYPE__GUEST_KCORE,
>  	DSO_BINARY_TYPE__OPENEMBEDDED_DEBUGINFO,
>  	DSO_BINARY_TYPE__BPF_PROG_INFO,
> +	DSO_BINARY_TYPE__BPF_IMAGE,
>  	DSO_BINARY_TYPE__NOT_FOUND,
>  };
>  
> diff --git a/tools/perf/util/machine.c b/tools/perf/util/machine.c
> index 463ada5117f8..372ed147bed5 100644
> --- a/tools/perf/util/machine.c
> +++ b/tools/perf/util/machine.c
> @@ -719,6 +719,12 @@ int machine__process_switch_event(struct machine *machine __maybe_unused,
>  	return 0;
>  }
>  
> +static int is_bpf_image(const char *name)
> +{
> +	return strncmp(name, "bpf_trampoline_", sizeof("bpf_trampoline_") - 1) ||
> +	       strncmp(name, "bpf_dispatcher_", sizeof("bpf_dispatcher_") - 1);
> +}
> +
>  static int machine__process_ksymbol_register(struct machine *machine,
>  					     union perf_event *event,
>  					     struct perf_sample *sample __maybe_unused)
> @@ -743,6 +749,11 @@ static int machine__process_ksymbol_register(struct machine *machine,
>  		map->end = map->start + event->ksymbol.len;
>  		maps__insert(&machine->kmaps, map);
>  		dso__set_loaded(dso);
> +
> +		if (is_bpf_image(event->ksymbol.name)) {
> +			dso->binary_type = DSO_BINARY_TYPE__BPF_IMAGE;
> +			dso__set_long_name(dso, "", false);
> +		}
>  	}
>  
>  	sym = symbol__new(map->map_ip(map, map->start),
> diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c
> index 3b379b1296f1..e6caec4b6054 100644
> --- a/tools/perf/util/symbol.c
> +++ b/tools/perf/util/symbol.c
> @@ -1537,6 +1537,7 @@ static bool dso__is_compatible_symtab_type(struct dso *dso, bool kmod,
>  		return true;
>  
>  	case DSO_BINARY_TYPE__BPF_PROG_INFO:
> +	case DSO_BINARY_TYPE__BPF_IMAGE:
>  	case DSO_BINARY_TYPE__NOT_FOUND:
>  	default:
>  		return false;
> -- 
> 2.24.1

Patch
diff mbox series

diff --git a/tools/perf/util/annotate.c b/tools/perf/util/annotate.c
index ca73fb74ad03..d9e606e11936 100644
--- a/tools/perf/util/annotate.c
+++ b/tools/perf/util/annotate.c
@@ -1843,6 +1843,24 @@  static int symbol__disassemble_bpf(struct symbol *sym __maybe_unused,
 }
 #endif // defined(HAVE_LIBBFD_SUPPORT) && defined(HAVE_LIBBPF_SUPPORT)
 
+static int
+symbol__disassemble_bpf_image(struct symbol *sym,
+			      struct annotate_args *args)
+{
+	struct annotation *notes = symbol__annotation(sym);
+	struct disasm_line *dl;
+
+	args->offset = -1;
+	args->line = strdup("to be implemented");
+	args->line_nr = 0;
+	dl = disasm_line__new(args);
+	if (dl)
+		annotation_line__add(&dl->al, &notes->src->source);
+
+	free(args->line);
+	return 0;
+}
+
 /*
  * Possibly create a new version of line with tabs expanded. Returns the
  * existing or new line, storage is updated if a new line is allocated. If
@@ -1942,6 +1960,8 @@  static int symbol__disassemble(struct symbol *sym, struct annotate_args *args)
 
 	if (dso->binary_type == DSO_BINARY_TYPE__BPF_PROG_INFO) {
 		return symbol__disassemble_bpf(sym, args);
+	} else if (dso->binary_type == DSO_BINARY_TYPE__BPF_IMAGE) {
+		return symbol__disassemble_bpf_image(sym, args);
 	} else if (dso__is_kcore(dso)) {
 		kce.kcore_filename = symfs_filename;
 		kce.addr = map__rip_2objdump(map, sym->start);
diff --git a/tools/perf/util/dso.c b/tools/perf/util/dso.c
index 91f21239608b..f338990e0fe6 100644
--- a/tools/perf/util/dso.c
+++ b/tools/perf/util/dso.c
@@ -191,6 +191,7 @@  int dso__read_binary_type_filename(const struct dso *dso,
 	case DSO_BINARY_TYPE__GUEST_KALLSYMS:
 	case DSO_BINARY_TYPE__JAVA_JIT:
 	case DSO_BINARY_TYPE__BPF_PROG_INFO:
+	case DSO_BINARY_TYPE__BPF_IMAGE:
 	case DSO_BINARY_TYPE__NOT_FOUND:
 		ret = -1;
 		break;
diff --git a/tools/perf/util/dso.h b/tools/perf/util/dso.h
index 2db64b79617a..9553a1fd9e8a 100644
--- a/tools/perf/util/dso.h
+++ b/tools/perf/util/dso.h
@@ -40,6 +40,7 @@  enum dso_binary_type {
 	DSO_BINARY_TYPE__GUEST_KCORE,
 	DSO_BINARY_TYPE__OPENEMBEDDED_DEBUGINFO,
 	DSO_BINARY_TYPE__BPF_PROG_INFO,
+	DSO_BINARY_TYPE__BPF_IMAGE,
 	DSO_BINARY_TYPE__NOT_FOUND,
 };
 
diff --git a/tools/perf/util/machine.c b/tools/perf/util/machine.c
index 463ada5117f8..372ed147bed5 100644
--- a/tools/perf/util/machine.c
+++ b/tools/perf/util/machine.c
@@ -719,6 +719,12 @@  int machine__process_switch_event(struct machine *machine __maybe_unused,
 	return 0;
 }
 
+static int is_bpf_image(const char *name)
+{
+	return strncmp(name, "bpf_trampoline_", sizeof("bpf_trampoline_") - 1) ||
+	       strncmp(name, "bpf_dispatcher_", sizeof("bpf_dispatcher_") - 1);
+}
+
 static int machine__process_ksymbol_register(struct machine *machine,
 					     union perf_event *event,
 					     struct perf_sample *sample __maybe_unused)
@@ -743,6 +749,11 @@  static int machine__process_ksymbol_register(struct machine *machine,
 		map->end = map->start + event->ksymbol.len;
 		maps__insert(&machine->kmaps, map);
 		dso__set_loaded(dso);
+
+		if (is_bpf_image(event->ksymbol.name)) {
+			dso->binary_type = DSO_BINARY_TYPE__BPF_IMAGE;
+			dso__set_long_name(dso, "", false);
+		}
 	}
 
 	sym = symbol__new(map->map_ip(map, map->start),
diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c
index 3b379b1296f1..e6caec4b6054 100644
--- a/tools/perf/util/symbol.c
+++ b/tools/perf/util/symbol.c
@@ -1537,6 +1537,7 @@  static bool dso__is_compatible_symtab_type(struct dso *dso, bool kmod,
 		return true;
 
 	case DSO_BINARY_TYPE__BPF_PROG_INFO:
+	case DSO_BINARY_TYPE__BPF_IMAGE:
 	case DSO_BINARY_TYPE__NOT_FOUND:
 	default:
 		return false;