perf script: Enable printing of interrupted machine state

This patch adds the output of the interrupted machine state (iregs) to
perf script. It presents them  as NAME:VALUE so this is easy to parse
during post processing.

To capture the interrupted machine state:
   $ perf record -I ....

to display iregs, use the -F option:

   $ perf script -F ip,iregs
   40afc2   AX:0x6c5770    BX:0x1e    CX:0x5f4d80a    DX:0x101010101010101    SI:0x1

Signed-off-by: Stephane Eranian <eranian@google.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Kan Liang <kan.liang@intel.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/1441039273-16260-2-git-send-email-eranian@google.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

2 files changed, 31 insertions, 2 deletions

diff --git a/tools/perf/Documentation/perf-script.txt b/tools/perf/Documentation/perf-script.txt
index 614b2c7b0293..dc3ec783b7bd 100644
--- a/tools/perf/Documentation/perf-script.txt
+++ b/tools/perf/Documentation/perf-script.txt
@@ -116,7 +116,7 @@ OPTIONS
 --fields::
         Comma separated list of fields to print. Options are:
         comm, tid, pid, time, cpu, event, trace, ip, sym, dso, addr, symoff,
-        srcline, period, flags.
+        srcline, period, iregs, flags.
         Field list can be prepended with the type, trace, sw or hw,
         to indicate to which event type the field list applies.
         e.g., -f sw:comm,tid,time,ip,sym  and -f trace:time,cpu,trace
diff --git a/tools/perf/builtin-script.c b/tools/perf/builtin-script.c
index 4430340292c0..eb51325e8ad9 100644
--- a/tools/perf/builtin-script.c
+++ b/tools/perf/builtin-script.c
@@ -6,6 +6,7 @@
 #include "util/exec_cmd.h"
 #include "util/header.h"
 #include "util/parse-options.h"
+#include "util/perf_regs.h"
 #include "util/session.h"
 #include "util/tool.h"
 #include "util/symbol.h"
@@ -46,6 +47,7 @@ enum perf_output_field {
         PERF_OUTPUT_SYMOFFSET       = 1U << 11,
         PERF_OUTPUT_SRCLINE         = 1U << 12,
         PERF_OUTPUT_PERIOD          = 1U << 13,
+        PERF_OUTPUT_IREGS           = 1U << 14,
 };
 
 struct output_option {
@@ -66,6 +68,7 @@ struct output_option {
         {.str = "symoff", .field = PERF_OUTPUT_SYMOFFSET},
         {.str = "srcline", .field = PERF_OUTPUT_SRCLINE},
         {.str = "period", .field = PERF_OUTPUT_PERIOD},
+        {.str = "iregs", .field = PERF_OUTPUT_IREGS},
 };
 
 /* default set to maintain compatibility with current format */
@@ -255,6 +258,11 @@ static int perf_evsel__check_attr(struct perf_evsel *evsel,
                                         PERF_OUTPUT_PERIOD))
                 return -EINVAL;
 
+        if (PRINT_FIELD(IREGS) &&
+                perf_evsel__check_stype(evsel, PERF_SAMPLE_REGS_INTR, "IREGS",
+                                        PERF_OUTPUT_IREGS))
+                return -EINVAL;
+
         return 0;
 }
 
@@ -352,6 +360,24 @@ out:
         return 0;
 }
 
+static void print_sample_iregs(union perf_event *event __maybe_unused,
+                          struct perf_sample *sample,
+                          struct thread *thread __maybe_unused,
+                          struct perf_event_attr *attr)
+{
+        struct regs_dump *regs = &sample->intr_regs;
+        uint64_t mask = attr->sample_regs_intr;
+        unsigned i = 0, r;
+
+        if (!regs)
+                return;
+
+        for_each_set_bit(r, (unsigned long *) &mask, sizeof(mask) * 8) {
+                u64 val = regs->regs[i++];
+                printf("%5s:0x%"PRIx64" ", perf_reg_name(r), val);
+        }
+}
+
 static void print_sample_start(struct perf_sample *sample,
                                struct thread *thread,
                                struct perf_evsel *evsel)
@@ -525,6 +551,9 @@ static void process_event(union perf_event *event, struct perf_sample *sample,
                                      PERF_MAX_STACK_DEPTH);
         }
 
+        if (PRINT_FIELD(IREGS))
+                print_sample_iregs(event, sample, thread, attr);
+
         printf("\n");
 }
 
@@ -1643,7 +1672,7 @@ int cmd_script(int argc, const char **argv, const char *prefix __maybe_unused)
                      "comma separated output fields prepend with 'type:'. "
                      "Valid types: hw,sw,trace,raw. "
                      "Fields: comm,tid,pid,time,cpu,event,trace,ip,sym,dso,"
-                     "addr,symoff,period,flags", parse_output_fields),
+                     "addr,symoff,period,iregs,flags", parse_output_fields),
         OPT_BOOLEAN('a', "all-cpus", &system_wide,
                     "system-wide collection from all CPUs"),
         OPT_STRING('S', "symbols", &symbol_conf.sym_list_str, "symbol[,symbol...]",