MIPS: perf: Fix I6400 event numbers

BugLink: https://bugs.launchpad.net/bugs/1878232

commit fd716fca upstream.

Fix perf hardware performance counter event numbers for I6400. This core
does not follow the performance event numbering scheme of previous MIPS
cores. All performance counters (both odd and even) are capable of
counting any of the available events.

Fixes: 4e88a862 ("MIPS: Add cases for CPU_I6400")
Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/13259/Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Ian May <ian.may@canonical.com>
Signed-off-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>

arch/mips/kernel/perf_event_mipsxx.c

@@ -825,6 +825,16 @@ static const struct mips_perf_event mipsxxcore_event_map2
 	[PERF_COUNT_HW_BRANCH_MISSES] = { 0x27, CNTR_ODD, T },
 };
 
+static const struct mips_perf_event i6400_event_map[PERF_COUNT_HW_MAX] = {
+	[PERF_COUNT_HW_CPU_CYCLES]          = { 0x00, CNTR_EVEN | CNTR_ODD },
+	[PERF_COUNT_HW_INSTRUCTIONS]        = { 0x01, CNTR_EVEN | CNTR_ODD },
+	/* These only count dcache, not icache */
+	[PERF_COUNT_HW_CACHE_REFERENCES]    = { 0x45, CNTR_EVEN | CNTR_ODD },
+	[PERF_COUNT_HW_CACHE_MISSES]        = { 0x48, CNTR_EVEN | CNTR_ODD },
+	[PERF_COUNT_HW_BRANCH_INSTRUCTIONS] = { 0x15, CNTR_EVEN | CNTR_ODD },
+	[PERF_COUNT_HW_BRANCH_MISSES]       = { 0x16, CNTR_EVEN | CNTR_ODD },
+};
+
 static const struct mips_perf_event loongson3_event_map[PERF_COUNT_HW_MAX] = {
 	[PERF_COUNT_HW_CPU_CYCLES] = { 0x00, CNTR_EVEN },
 	[PERF_COUNT_HW_INSTRUCTIONS] = { 0x00, CNTR_ODD },
@@ -1015,6 +1025,46 @@ static const struct mips_perf_event mipsxxcore_cache_map2
 },
 };
 
+static const struct mips_perf_event i6400_cache_map
+				[PERF_COUNT_HW_CACHE_MAX]
+				[PERF_COUNT_HW_CACHE_OP_MAX]
+				[PERF_COUNT_HW_CACHE_RESULT_MAX] = {
+[C(L1D)] = {
+	[C(OP_READ)] = {
+		[C(RESULT_ACCESS)]	= { 0x46, CNTR_EVEN | CNTR_ODD },
+		[C(RESULT_MISS)]	= { 0x49, CNTR_EVEN | CNTR_ODD },
+	},
+	[C(OP_WRITE)] = {
+		[C(RESULT_ACCESS)]	= { 0x47, CNTR_EVEN | CNTR_ODD },
+		[C(RESULT_MISS)]	= { 0x4a, CNTR_EVEN | CNTR_ODD },
+	},
+},
+[C(L1I)] = {
+	[C(OP_READ)] = {
+		[C(RESULT_ACCESS)]	= { 0x84, CNTR_EVEN | CNTR_ODD },
+		[C(RESULT_MISS)]	= { 0x85, CNTR_EVEN | CNTR_ODD },
+	},
+},
+[C(DTLB)] = {
+	/* Can't distinguish read & write */
+	[C(OP_READ)] = {
+		[C(RESULT_ACCESS)]	= { 0x40, CNTR_EVEN | CNTR_ODD },
+		[C(RESULT_MISS)]	= { 0x41, CNTR_EVEN | CNTR_ODD },
+	},
+	[C(OP_WRITE)] = {
+		[C(RESULT_ACCESS)]	= { 0x40, CNTR_EVEN | CNTR_ODD },
+		[C(RESULT_MISS)]	= { 0x41, CNTR_EVEN | CNTR_ODD },
+	},
+},
+[C(BPU)] = {
+	/* Conditional branches / mispredicted */
+	[C(OP_READ)] = {
+		[C(RESULT_ACCESS)]	= { 0x15, CNTR_EVEN | CNTR_ODD },
+		[C(RESULT_MISS)]	= { 0x16, CNTR_EVEN | CNTR_ODD },
+	},
+},
+};
+
 static const struct mips_perf_event loongson3_cache_map
 				[PERF_COUNT_HW_CACHE_MAX]
 				[PERF_COUNT_HW_CACHE_OP_MAX]
@@ -1720,8 +1770,8 @@ init_hw_perf_events(void)
 		break;
 	case CPU_I6400:
 		mipspmu.name = "mips/I6400";
-		mipspmu.general_event_map = &mipsxxcore_event_map2;
-		mipspmu.cache_event_map = &mipsxxcore_cache_map2;
+		mipspmu.general_event_map = &i6400_event_map;
+		mipspmu.cache_event_map = &i6400_cache_map;
 		break;
 	case CPU_1004K:
 		mipspmu.name = "mips/1004K";