[PATCH v2 3/4] perf, tools: Add support for printing new mem_info encodings

[Andi Kleen]

From: Andi Kleen <ak@xxxxxxxxxxxxxxx>

Add decoding for the new lvlx and snoopx field meminfo field
added earlier to the kernel so that "perf mem report" and
other tools can print it properly.

v2: Merge with persistent memory patch.
Switch to new bit encoding for each combination.
Signed-off-by: Andi Kleen <ak@xxxxxxxxxxxxxxx>
---
 tools/include/uapi/linux/perf_event.h | 22 +++++++++++++++++--
 tools/perf/util/mem-events.c          | 40 ++++++++++++++++++++++++++++++++---
 2 files changed, 57 insertions(+), 5 deletions(-)

diff --git a/tools/include/uapi/linux/perf_event.h b/tools/include/uapi/linux/perf_event.h
index b1c0b187acfe..95daade294d7 100644
--- a/tools/include/uapi/linux/perf_event.h
+++ b/tools/include/uapi/linux/perf_event.h
@@ -931,14 +931,18 @@ union perf_mem_data_src {
 			mem_snoop:5,	/* snoop mode */
 			mem_lock:2,	/* lock instr */
 			mem_dtlb:7,	/* tlb access */
-			mem_rsvd:31;
+			mem_lvlx:8,	/* memory hierarchy level, ext */
+			mem_snoopx:2,	/* snoop mode, ext */
+			mem_rsvd:21;
 	};
 };
 #elif defined(__BIG_ENDIAN_BITFIELD)
 union perf_mem_data_src {
 	__u64 val;
 	struct {
-		__u64	mem_rsvd:31,
+		__u64	mem_rsvd:21,
+			mem_snoopx:2,	/* snoop mode, ext */
+			mem_lvlx:8,	/* memory hierarchy level, ext */
 			mem_dtlb:7,	/* tlb access */
 			mem_lock:2,	/* lock instr */
 			mem_snoop:5,	/* snoop mode */
@@ -975,6 +979,16 @@ union perf_mem_data_src {
 #define PERF_MEM_LVL_UNC	0x2000 /* Uncached memory */
 #define PERF_MEM_LVL_SHIFT	5
 
+#define PERF_MEM_LVLX_L4	0x01 /* L4 */
+#define PERF_MEM_LVLX_REM_L4    0x02 /* Remote L4 */
+#define PERF_MEM_LVLX_REM_RAM	0x04 /* Remote Ram, unknown hops */
+#define PERF_MEM_LVLX_PMEM	0x08 /* Persistent Memory */
+#define PERF_MEM_LVLX_REM_PMEM	0x10 /* Remote Persistent Memory */
+#define PERF_MEM_LVLX_REM_NA	0x20 /* Remote N/A level */
+/* 2 free */
+
+#define PERF_MEM_LVLX_SHIFT	33
+
 /* snoop mode */
 #define PERF_MEM_SNOOP_NA	0x01 /* not available */
 #define PERF_MEM_SNOOP_NONE	0x02 /* no snoop */
@@ -983,6 +997,10 @@ union perf_mem_data_src {
 #define PERF_MEM_SNOOP_HITM	0x10 /* snoop hit modified */
 #define PERF_MEM_SNOOP_SHIFT	19
 
+#define PERF_MEM_SNOOPX_FWD	0x01 /* forward */
+/* 1 free */
+#define PERF_MEM_SNOOPX_SHIFT	41
+
 /* locked instruction */
 #define PERF_MEM_LOCK_NA	0x01 /* not available */
 #define PERF_MEM_LOCK_LOCKED	0x02 /* locked transaction */
diff --git a/tools/perf/util/mem-events.c b/tools/perf/util/mem-events.c
index 06f5a3a4295c..28968e54cab4 100644
--- a/tools/perf/util/mem-events.c
+++ b/tools/perf/util/mem-events.c
@@ -166,11 +166,21 @@ static const char * const mem_lvl[] = {
 	"Uncached",
 };
 
+static const char * const mem_lvlx[] = {
+	"L4",
+	"Remote L4",
+	"Remote RAM",
+	"PMEM",
+	"Remote PMEM",
+	"Remote N/A",
+};
+
 int perf_mem__lvl_scnprintf(char *out, size_t sz, struct mem_info *mem_info)
 {
 	size_t i, l = 0;
 	u64 m =  PERF_MEM_LVL_NA;
 	u64 hit, miss;
+	int printed;
 
 	if (mem_info)
 		m  = mem_info->data_src.mem_lvl;
@@ -184,17 +194,33 @@ int perf_mem__lvl_scnprintf(char *out, size_t sz, struct mem_info *mem_info)
 	/* already taken care of */
 	m &= ~(PERF_MEM_LVL_HIT|PERF_MEM_LVL_MISS);
 
+	printed = 0;
 	for (i = 0; m && i < ARRAY_SIZE(mem_lvl); i++, m >>= 1) {
 		if (!(m & 0x1))
 			continue;
-		if (l) {
+		if (printed++) {
 			strcat(out, " or ");
 			l += 4;
 		}
 		l += scnprintf(out + l, sz - l, mem_lvl[i]);
 	}
-	if (*out == '\0')
-		l += scnprintf(out, sz - l, "N/A");
+
+	m = 0;
+	if (mem_info)
+		m = mem_info->data_src.mem_lvlx;
+
+	for (i = 0; m && i < ARRAY_SIZE(mem_lvlx); i++, m >>= 1) {
+		if (!(m & 0x1))
+			continue;
+		if (printed++) {
+			strcat(out, " or ");
+			l += 4;
+		}
+		l += scnprintf(out + l, sz - l, mem_lvlx[i]);
+	}
+
+	if (l == 0)
+		l += scnprintf(out + l, sz - l, "N/A");
 	if (hit)
 		l += scnprintf(out + l, sz - l, " hit");
 	if (miss)
@@ -231,6 +257,14 @@ int perf_mem__snp_scnprintf(char *out, size_t sz, struct mem_info *mem_info)
 		}
 		l += scnprintf(out + l, sz - l, snoop_access[i]);
 	}
+	if (mem_info &&
+	     (mem_info->data_src.mem_snoopx & PERF_MEM_SNOOPX_FWD)) {
+		if (l) {
+			strcat(out, " or ");
+			l += 4;
+		}
+		l += scnprintf(out + l, sz - l, "Fwd");
+	}
 
 	if (*out == '\0')
 		l += scnprintf(out, sz - l, "N/A");
-- 
2.9.4