perf mem: Print snoop peer flag

Since PERF_MEM_SNOOPX_PEER flag is a new snoop type, print this flag if
it is set.

Before:
       memstress  3603 [020]   122.463754:          1            l1d-miss:       8688000842 |OP LOAD|LVL L3 or L3 hit|SNP N/A|TLB Walker hit|LCK No|BLK  N/A               aaaac17c3e88 [unknown] (/home/ubuntu/memstress)
       memstress  3603 [020]   122.463754:          1          l1d-access:       8688000842 |OP LOAD|LVL L3 or L3 hit|SNP N/A|TLB Walker hit|LCK No|BLK  N/A               aaaac17c3e88 [unknown] (/home/ubuntu/memstress)
       memstress  3603 [020]   122.463754:          1            llc-miss:       8688000842 |OP LOAD|LVL L3 or L3 hit|SNP N/A|TLB Walker hit|LCK No|BLK  N/A               aaaac17c3e88 [unknown] (/home/ubuntu/memstress)
       memstress  3603 [020]   122.463754:          1          llc-access:       8688000842 |OP LOAD|LVL L3 or L3 hit|SNP N/A|TLB Walker hit|LCK No|BLK  N/A               aaaac17c3e88 [unknown] (/home/ubuntu/memstress)
       memstress  3603 [020]   122.463754:          1          tlb-access:       8688000842 |OP LOAD|LVL L3 or L3 hit|SNP N/A|TLB Walker hit|LCK No|BLK  N/A               aaaac17c3e88 [unknown] (/home/ubuntu/memstress)
       memstress  3603 [020]   122.463754:          1              memory:       8688000842 |OP LOAD|LVL L3 or L3 hit|SNP N/A|TLB Walker hit|LCK No|BLK  N/A               aaaac17c3e88 [unknown] (/home/ubuntu/memstress)

After:

       memstress  3603 [020]   122.463754:          1            l1d-miss:       8688000842 |OP LOAD|LVL L3 or L3 hit|SNP Peer|TLB Walker hit|LCK No|BLK  N/A              aaaac17c3e88 [unknown] (/home/ubuntu/memstress)
       memstress  3603 [020]   122.463754:          1          l1d-access:       8688000842 |OP LOAD|LVL L3 or L3 hit|SNP Peer|TLB Walker hit|LCK No|BLK  N/A              aaaac17c3e88 [unknown] (/home/ubuntu/memstress)
       memstress  3603 [020]   122.463754:          1            llc-miss:       8688000842 |OP LOAD|LVL L3 or L3 hit|SNP Peer|TLB Walker hit|LCK No|BLK  N/A              aaaac17c3e88 [unknown] (/home/ubuntu/memstress)
       memstress  3603 [020]   122.463754:          1          llc-access:       8688000842 |OP LOAD|LVL L3 or L3 hit|SNP Peer|TLB Walker hit|LCK No|BLK  N/A              aaaac17c3e88 [unknown] (/home/ubuntu/memstress)
       memstress  3603 [020]   122.463754:          1          tlb-access:       8688000842 |OP LOAD|LVL L3 or L3 hit|SNP Peer|TLB Walker hit|LCK No|BLK  N/A              aaaac17c3e88 [unknown] (/home/ubuntu/memstress)
       memstress  3603 [020]   122.463754:          1              memory:       8688000842 |OP LOAD|LVL L3 or L3 hit|SNP Peer|TLB Walker hit|LCK No|BLK  N/A              aaaac17c3e88 [unknown] (/home/ubuntu/memstress)

Reviewed-by: Ali Saidi <[email protected]>
Reviewed-by: Kajol Jain <[email protected]>
Signed-off-by: Leo Yan <[email protected]>
Tested-by: Ali Saidi <[email protected]>
Cc: Adrian Hunter <[email protected]>
Cc: Alexander Shishkin <[email protected]>
Cc: Anshuman Khandual <[email protected]>
Cc: German Gomez <[email protected]>
Cc: Gustavo A. R. Silva <[email protected]>
Cc: Ian Rogers <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: James Clark <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: John Garry <[email protected]>
Cc: Like Xu <[email protected]>
Cc: Mark Rutland <[email protected]>
Cc: Mike Leach <[email protected]>
Cc: Namhyung Kim <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Timothy Hayes <[email protected]>
Cc: Will Deacon <[email protected]>
Cc: [email protected]
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

Author: Leo Yan

tools/perf/util/mem-events.c

@@ -410,6 +410,11 @@ static const char * const snoop_access[] = {
 	"HitM",
 };
 
+static const char * const snoopx_access[] = {
+	"Fwd",
+	"Peer",
+};
+
 int perf_mem__snp_scnprintf(char *out, size_t sz, struct mem_info *mem_info)
 {
 	size_t i, l = 0;
@@ -430,13 +435,20 @@ 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)) {
+
+	m = 0;
+	if (mem_info)
+		m = mem_info->data_src.mem_snoopx;
+
+	for (i = 0; m && i < ARRAY_SIZE(snoopx_access); i++, m >>= 1) {
+		if (!(m & 0x1))
+			continue;
+
 		if (l) {
 			strcat(out, " or ");
 			l += 4;
 		}
-		l += scnprintf(out + l, sz - l, "Fwd");
+		l += scnprintf(out + l, sz - l, snoopx_access[i]);
 	}
 
 	if (*out == '\0')