perf tools: Reconstruct hw cache event with modifiers from perf_event_attr

  [root@sandy ~]# perf record -a -e dTLB-load-misses:u usleep 1
  [ perf record: Woken up 1 times to write data ]
  [ perf record: Captured and wrote 0.486 MB perf.data (~21216 samples) ]

Before:

  [root@sandy ~]# perf evlist
  dTLB-load-misses
  [root@sandy ~]#

After:

  [root@sandy ~]# perf evlist
  dTLB-load-misses:u
  [root@sandy ~]#

Ditto for other tools.

Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Namhyung Kim <namhyung@gmail.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/n/tip-7x1b0e6jthkr93lfjzsuakk5@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 104 insertions, 0 deletions

diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index dab893804a1..47f1fe2feab 100644
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -128,6 +128,105 @@ static int perf_evsel__hw_name(struct perf_evsel *evsel, char *bf, size_t size)
         return r + perf_evsel__add_modifiers(evsel, bf + r, size - r);
 }
 
+const char *perf_evsel__hw_cache[PERF_COUNT_HW_CACHE_MAX]
+                                [PERF_EVSEL__MAX_ALIASES] = {
+ { "L1-dcache", "l1-d",         "l1d",          "L1-data",              },
+ { "L1-icache", "l1-i",         "l1i",          "L1-instruction",       },
+ { "LLC",       "L2",                                                   },
+ { "dTLB",      "d-tlb",        "Data-TLB",                             },
+ { "iTLB",      "i-tlb",        "Instruction-TLB",                      },
+ { "branch",    "branches",     "bpu",          "btb",          "bpc",  },
+ { "node",                                                              },
+};
+
+const char *perf_evsel__hw_cache_op[PERF_COUNT_HW_CACHE_OP_MAX]
+                                   [PERF_EVSEL__MAX_ALIASES] = {
+ { "load",      "loads",        "read",                                 },
+ { "store",     "stores",       "write",                                },
+ { "prefetch",  "prefetches",   "speculative-read", "speculative-load", },
+};
+
+const char *perf_evsel__hw_cache_result[PERF_COUNT_HW_CACHE_RESULT_MAX]
+                                       [PERF_EVSEL__MAX_ALIASES] = {
+ { "refs",      "Reference",    "ops",          "access",               },
+ { "misses",    "miss",                                                 },
+};
+
+#define C(x)            PERF_COUNT_HW_CACHE_##x
+#define CACHE_READ      (1 << C(OP_READ))
+#define CACHE_WRITE     (1 << C(OP_WRITE))
+#define CACHE_PREFETCH  (1 << C(OP_PREFETCH))
+#define COP(x)          (1 << x)
+
+/*
+ * cache operartion stat
+ * L1I : Read and prefetch only
+ * ITLB and BPU : Read-only
+ */
+static unsigned long perf_evsel__hw_cache_stat[C(MAX)] = {
+ [C(L1D)]       = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
+ [C(L1I)]       = (CACHE_READ | CACHE_PREFETCH),
+ [C(LL)]        = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
+ [C(DTLB)]      = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
+ [C(ITLB)]      = (CACHE_READ),
+ [C(BPU)]       = (CACHE_READ),
+ [C(NODE)]      = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
+};
+
+bool perf_evsel__is_cache_op_valid(u8 type, u8 op)
+{
+        if (perf_evsel__hw_cache_stat[type] & COP(op))
+                return true;    /* valid */
+        else
+                return false;   /* invalid */
+}
+
+int __perf_evsel__hw_cache_type_op_res_name(u8 type, u8 op, u8 result,
+                                            char *bf, size_t size)
+{
+        if (result) {
+                return scnprintf(bf, size, "%s-%s-%s", perf_evsel__hw_cache[type][0],
+                                 perf_evsel__hw_cache_op[op][0],
+                                 perf_evsel__hw_cache_result[result][0]);
+        }
+
+        return scnprintf(bf, size, "%s-%s", perf_evsel__hw_cache[type][0],
+                         perf_evsel__hw_cache_op[op][1]);
+}
+
+int __perf_evsel__hw_cache_name(u64 config, char *bf, size_t size)
+{
+        u8 op, result, type = (config >>  0) & 0xff;
+        const char *err = "unknown-ext-hardware-cache-type";
+
+        if (type > PERF_COUNT_HW_CACHE_MAX)
+                goto out_err;
+
+        op = (config >>  8) & 0xff;
+        err = "unknown-ext-hardware-cache-op";
+        if (op > PERF_COUNT_HW_CACHE_OP_MAX)
+                goto out_err;
+
+        result = (config >> 16) & 0xff;
+        err = "unknown-ext-hardware-cache-result";
+        if (result > PERF_COUNT_HW_CACHE_RESULT_MAX)
+                goto out_err;
+
+        err = "invalid-cache";
+        if (!perf_evsel__is_cache_op_valid(type, op))
+                goto out_err;
+
+        return __perf_evsel__hw_cache_type_op_res_name(type, op, result, bf, size);
+out_err:
+        return scnprintf(bf, size, "%s", err);
+}
+
+static int perf_evsel__hw_cache_name(struct perf_evsel *evsel, char *bf, size_t size)
+{
+        int ret = __perf_evsel__hw_cache_name(evsel->attr.config, bf, size);
+        return ret + perf_evsel__add_modifiers(evsel, bf + ret, size - ret);
+}
+
 int perf_evsel__name(struct perf_evsel *evsel, char *bf, size_t size)
 {
         int ret;
@@ -140,6 +239,11 @@ int perf_evsel__name(struct perf_evsel *evsel, char *bf, size_t size)
         case PERF_TYPE_HARDWARE:
                 ret = perf_evsel__hw_name(evsel, bf, size);
                 break;
+
+        case PERF_TYPE_HW_CACHE:
+                ret = perf_evsel__hw_cache_name(evsel, bf, size);
+                break;
+
         default:
                 /*
                  * FIXME