perf tools: Handle PERF_RECORD_KSYMBOL

This patch handles PERF_RECORD_KSYMBOL in perf record/report.
Specifically, map and symbol are created for ksymbol register, and
removed for ksymbol unregister.

This patch also sets perf_event_attr.ksymbol properly. The flag is ON by
default.

Committer notes:

Use proper inttypes.h for u64, fixing the build in some environments
like in the android NDK r15c targetting ARM 32-bit.

I.e. fixing this build error:

  util/event.c: In function 'perf_event__fprintf_ksymbol':
  util/event.c:1489:10: error: format '%lx' expects argument of type 'long unsigned int', but argument 3 has type 'u64' [-Werror=format=]
            event->ksymbol_event.flags, event->ksymbol_event.name);
            ^
  cc1: all warnings being treated as errors

Signed-off-by: Song Liu <songliubraving@fb.com>
Reviewed-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: kernel-team@fb.com
Cc: netdev@vger.kernel.org
Link: http://lkml.kernel.org/r/20190117161521.1341602-6-songliubraving@fb.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/util/event.c b/tools/perf/util/event.c
index 937a5a4..f06f381 100644 (file)
--- a/tools/perf/util/event.c
+++ b/tools/perf/util/event.c
@@ -24,6 +24,7 @@
 #include "symbol/kallsyms.h"
 #include "asm/bug.h"
 #include "stat.h"
+#include "session.h"
 
 #define DEFAULT_PROC_MAP_PARSE_TIMEOUT 500
 
@@ -45,6 +46,7 @@ static const char *perf_event__names[] = {
        [PERF_RECORD_SWITCH]                    = "SWITCH",
        [PERF_RECORD_SWITCH_CPU_WIDE]           = "SWITCH_CPU_WIDE",
        [PERF_RECORD_NAMESPACES]                = "NAMESPACES",
+       [PERF_RECORD_KSYMBOL]                   = "KSYMBOL",
        [PERF_RECORD_HEADER_ATTR]               = "ATTR",
        [PERF_RECORD_HEADER_EVENT_TYPE]         = "EVENT_TYPE",
        [PERF_RECORD_HEADER_TRACING_DATA]       = "TRACING_DATA",
@@ -1329,6 +1331,14 @@ int perf_event__process_switch(struct perf_tool *tool __maybe_unused,
        return machine__process_switch_event(machine, event);
 }
 
+int perf_event__process_ksymbol(struct perf_tool *tool __maybe_unused,
+                               union perf_event *event,
+                               struct perf_sample *sample __maybe_unused,
+                               struct machine *machine)
+{
+       return machine__process_ksymbol(machine, event, sample);
+}
+
 size_t perf_event__fprintf_mmap(union perf_event *event, FILE *fp)
 {
        return fprintf(fp, " %d/%d: [%#" PRIx64 "(%#" PRIx64 ") @ %#" PRIx64 "]: %c %s\n",
@@ -1461,6 +1471,14 @@ static size_t perf_event__fprintf_lost(union perf_event *event, FILE *fp)
        return fprintf(fp, " lost %" PRIu64 "\n", event->lost.lost);
 }
 
+size_t perf_event__fprintf_ksymbol(union perf_event *event, FILE *fp)
+{
+       return fprintf(fp, " ksymbol event with addr %" PRIx64 " len %u type %u flags 0x%x name %s\n",
+                      event->ksymbol_event.addr, event->ksymbol_event.len,
+                      event->ksymbol_event.ksym_type,
+                      event->ksymbol_event.flags, event->ksymbol_event.name);
+}
+
 size_t perf_event__fprintf(union perf_event *event, FILE *fp)
 {
        size_t ret = fprintf(fp, "PERF_RECORD_%s",
@@ -1496,6 +1514,9 @@ size_t perf_event__fprintf(union perf_event *event, FILE *fp)
        case PERF_RECORD_LOST:
                ret += perf_event__fprintf_lost(event, fp);
                break;
+       case PERF_RECORD_KSYMBOL:
+               ret += perf_event__fprintf_ksymbol(event, fp);
+               break;
        default:
                ret += fprintf(fp, "\n");
        }

diff --git a/tools/perf/util/event.h b/tools/perf/util/event.h
index eb95f33..018322f 100644 (file)
--- a/tools/perf/util/event.h
+++ b/tools/perf/util/event.h
@@ -5,6 +5,7 @@
 #include <limits.h>
 #include <stdio.h>
 #include <linux/kernel.h>
+#include <linux/bpf.h>
 
 #include "../perf.h"
 #include "build-id.h"
@@ -84,6 +85,19 @@ struct throttle_event {
        u64 stream_id;
 };
 
+#ifndef KSYM_NAME_LEN
+#define KSYM_NAME_LEN 256
+#endif
+
+struct ksymbol_event {
+       struct perf_event_header header;
+       u64 addr;
+       u32 len;
+       u16 ksym_type;
+       u16 flags;
+       char name[KSYM_NAME_LEN];
+};
+
 #define PERF_SAMPLE_MASK                               \
        (PERF_SAMPLE_IP | PERF_SAMPLE_TID |             \
         PERF_SAMPLE_TIME | PERF_SAMPLE_ADDR |          \
@@ -651,6 +665,7 @@ union perf_event {
        struct stat_round_event         stat_round;
        struct time_conv_event          time_conv;
        struct feature_event            feat;
+       struct ksymbol_event            ksymbol_event;
 };
 
 void perf_event__print_totals(void);
@@ -748,6 +763,10 @@ int perf_event__process_exit(struct perf_tool *tool,
                             union perf_event *event,
                             struct perf_sample *sample,
                             struct machine *machine);
+int perf_event__process_ksymbol(struct perf_tool *tool,
+                               union perf_event *event,
+                               struct perf_sample *sample,
+                               struct machine *machine);
 int perf_tool__process_synth_event(struct perf_tool *tool,
                                   union perf_event *event,
                                   struct machine *machine,
@@ -811,6 +830,7 @@ size_t perf_event__fprintf_switch(union perf_event *event, FILE *fp);
 size_t perf_event__fprintf_thread_map(union perf_event *event, FILE *fp);
 size_t perf_event__fprintf_cpu_map(union perf_event *event, FILE *fp);
 size_t perf_event__fprintf_namespaces(union perf_event *event, FILE *fp);
+size_t perf_event__fprintf_ksymbol(union perf_event *event, FILE *fp);
 size_t perf_event__fprintf(union perf_event *event, FILE *fp);
 
 int kallsyms__get_function_start(const char *kallsyms_filename,

diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index dbc0466..9c8dc6d 100644 (file)
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -1035,6 +1035,7 @@ void perf_evsel__config(struct perf_evsel *evsel, struct record_opts *opts,
        attr->mmap  = track;
        attr->mmap2 = track && !perf_missing_features.mmap2;
        attr->comm  = track;
+       attr->ksymbol = track && !perf_missing_features.ksymbol;
 
        if (opts->record_namespaces)
                attr->namespaces  = track;
@@ -1652,6 +1653,7 @@ int perf_event_attr__fprintf(FILE *fp, struct perf_event_attr *attr,
        PRINT_ATTRf(context_switch, p_unsigned);
        PRINT_ATTRf(write_backward, p_unsigned);
        PRINT_ATTRf(namespaces, p_unsigned);
+       PRINT_ATTRf(ksymbol, p_unsigned);
 
        PRINT_ATTRn("{ wakeup_events, wakeup_watermark }", wakeup_events, p_unsigned);
        PRINT_ATTRf(bp_type, p_unsigned);
@@ -1811,6 +1813,8 @@ fallback_missing_features:
                                     PERF_SAMPLE_BRANCH_NO_CYCLES);
        if (perf_missing_features.group_read && evsel->attr.inherit)
                evsel->attr.read_format &= ~(PERF_FORMAT_GROUP|PERF_FORMAT_ID);
+       if (perf_missing_features.ksymbol)
+               evsel->attr.ksymbol = 0;
 retry_sample_id:
        if (perf_missing_features.sample_id_all)
                evsel->attr.sample_id_all = 0;
@@ -1930,7 +1934,11 @@ try_fallback:
         * Must probe features in the order they were added to the
         * perf_event_attr interface.
         */
-       if (!perf_missing_features.write_backward && evsel->attr.write_backward) {
+       if (!perf_missing_features.ksymbol && evsel->attr.ksymbol) {
+               perf_missing_features.ksymbol = true;
+               pr_debug2("switching off ksymbol\n");
+               goto fallback_missing_features;
+       } else if (!perf_missing_features.write_backward && evsel->attr.write_backward) {
                perf_missing_features.write_backward = true;
                pr_debug2("switching off write_backward\n");
                goto out_close;

diff --git a/tools/perf/util/evsel.h b/tools/perf/util/evsel.h
index 82a289c..4a8c3e7 100644 (file)
--- a/tools/perf/util/evsel.h
+++ b/tools/perf/util/evsel.h
@@ -168,6 +168,7 @@ struct perf_missing_features {
        bool lbr_flags;
        bool write_backward;
        bool group_read;
+       bool ksymbol;
 };
 
 extern struct perf_missing_features perf_missing_features;

diff --git a/tools/perf/util/machine.c b/tools/perf/util/machine.c
index 143f705..9bca61c 100644 (file)
--- a/tools/perf/util/machine.c
+++ b/tools/perf/util/machine.c
@@ -681,6 +681,59 @@ int machine__process_switch_event(struct machine *machine __maybe_unused,
        return 0;
 }
 
+static int machine__process_ksymbol_register(struct machine *machine,
+                                            union perf_event *event,
+                                            struct perf_sample *sample __maybe_unused)
+{
+       struct symbol *sym;
+       struct map *map;
+
+       map = map_groups__find(&machine->kmaps, event->ksymbol_event.addr);
+       if (!map) {
+               map = dso__new_map(event->ksymbol_event.name);
+               if (!map)
+                       return -ENOMEM;
+
+               map->start = event->ksymbol_event.addr;
+               map->pgoff = map->start;
+               map->end = map->start + event->ksymbol_event.len;
+               map_groups__insert(&machine->kmaps, map);
+       }
+
+       sym = symbol__new(event->ksymbol_event.addr, event->ksymbol_event.len,
+                         0, 0, event->ksymbol_event.name);
+       if (!sym)
+               return -ENOMEM;
+       dso__insert_symbol(map->dso, sym);
+       return 0;
+}
+
+static int machine__process_ksymbol_unregister(struct machine *machine,
+                                              union perf_event *event,
+                                              struct perf_sample *sample __maybe_unused)
+{
+       struct map *map;
+
+       map = map_groups__find(&machine->kmaps, event->ksymbol_event.addr);
+       if (map)
+               map_groups__remove(&machine->kmaps, map);
+
+       return 0;
+}
+
+int machine__process_ksymbol(struct machine *machine __maybe_unused,
+                            union perf_event *event,
+                            struct perf_sample *sample)
+{
+       if (dump_trace)
+               perf_event__fprintf_ksymbol(event, stdout);
+
+       if (event->ksymbol_event.flags & PERF_RECORD_KSYMBOL_FLAGS_UNREGISTER)
+               return machine__process_ksymbol_unregister(machine, event,
+                                                          sample);
+       return machine__process_ksymbol_register(machine, event, sample);
+}
+
 static void dso__adjust_kmod_long_name(struct dso *dso, const char *filename)
 {
        const char *dup_filename;
@@ -1812,6 +1865,8 @@ int machine__process_event(struct machine *machine, union perf_event *event,
        case PERF_RECORD_SWITCH:
        case PERF_RECORD_SWITCH_CPU_WIDE:
                ret = machine__process_switch_event(machine, event); break;
+       case PERF_RECORD_KSYMBOL:
+               ret = machine__process_ksymbol(machine, event, sample); break;
        default:
                ret = -1;
                break;

diff --git a/tools/perf/util/machine.h b/tools/perf/util/machine.h
index a5d1da6..4ecd380 100644 (file)
--- a/tools/perf/util/machine.h
+++ b/tools/perf/util/machine.h
@@ -130,6 +130,9 @@ int machine__process_mmap_event(struct machine *machine, union perf_event *event
                                struct perf_sample *sample);
 int machine__process_mmap2_event(struct machine *machine, union perf_event *event,
                                 struct perf_sample *sample);
+int machine__process_ksymbol(struct machine *machine,
+                            union perf_event *event,
+                            struct perf_sample *sample);
 int machine__process_event(struct machine *machine, union perf_event *event,
                                struct perf_sample *sample);
 

diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
index b26bc9c..dcfacfb 100644 (file)
--- a/tools/perf/util/session.c
+++ b/tools/perf/util/session.c
@@ -379,6 +379,8 @@ void perf_tool__fill_defaults(struct perf_tool *tool)
                tool->itrace_start = perf_event__process_itrace_start;
        if (tool->context_switch == NULL)
                tool->context_switch = perf_event__process_switch;
+       if (tool->ksymbol == NULL)
+               tool->ksymbol = perf_event__process_ksymbol;
        if (tool->read == NULL)
                tool->read = process_event_sample_stub;
        if (tool->throttle == NULL)
@@ -1310,6 +1312,8 @@ static int machines__deliver_event(struct machines *machines,
        case PERF_RECORD_SWITCH:
        case PERF_RECORD_SWITCH_CPU_WIDE:
                return tool->context_switch(tool, event, sample, machine);
+       case PERF_RECORD_KSYMBOL:
+               return tool->ksymbol(tool, event, sample, machine);
        default:
                ++evlist->stats.nr_unknown_events;
                return -1;

diff --git a/tools/perf/util/tool.h b/tools/perf/util/tool.h
index 56e4ca5..9c81ca2 100644 (file)
--- a/tools/perf/util/tool.h
+++ b/tools/perf/util/tool.h
@@ -53,7 +53,9 @@ struct perf_tool {
                        itrace_start,
                        context_switch,
                        throttle,
-                       unthrottle;
+                       unthrottle,
+                       ksymbol;
+
        event_attr_op   attr;
        event_attr_op   event_update;
        event_op2       tracing_data;