MIPS: perf: Change the "mips_perf_event" table unsupported indicator.

Change the indicator from 0xffffffff in the "event_id" member to
zero in the "cntr_mask" member. This removes the need to initialize
entries that are unsupported. This also solves a problem where the
number of entries in the table was increased based on a globel enum
used for all platforms, but the new unsupported entries were not added
for mips. This was leaving new table entries of all zeros that we not
marked UNSUPPORTED.

Signed-off-by: Al Cooper <alcooperx@gmail.com>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/4110/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/kernel/perf_event_mipsxx.c

@@ -78,7 +78,6 @@ struct mips_perf_event {
 static struct mips_perf_event raw_event;
 static DEFINE_MUTEX(raw_event_mutex);
 
-#define UNSUPPORTED_PERF_EVENT_ID 0xffffffff
 #define C(x) PERF_COUNT_HW_CACHE_##x
 
 struct mips_pmu {
@@ -664,13 +663,10 @@ static unsigned int mipspmu_perf_event_encode(const struct mips_perf_event *pev)
 
 static const struct mips_perf_event *mipspmu_map_general_event(int idx)
 {
-	const struct mips_perf_event *pev;
-
-	pev = ((*mipspmu.general_event_map)[idx].event_id ==
-		UNSUPPORTED_PERF_EVENT_ID ? ERR_PTR(-EOPNOTSUPP) :
-		&(*mipspmu.general_event_map)[idx]);
 
-	return pev;
+	if ((*mipspmu.general_event_map)[idx].cntr_mask == 0)
+		return ERR_PTR(-EOPNOTSUPP);
+	return &(*mipspmu.general_event_map)[idx];
 }
 
 static const struct mips_perf_event *mipspmu_map_cache_event(u64 config)
@@ -695,7 +691,7 @@ static const struct mips_perf_event *mipspmu_map_cache_event(u64 config)
 					[cache_op]
 					[cache_result]);
 
-	if (pev->event_id == UNSUPPORTED_PERF_EVENT_ID)
+	if (pev->cntr_mask == 0)
 		return ERR_PTR(-EOPNOTSUPP);
 
 	return pev;
@@ -800,11 +796,8 @@ static const struct mips_perf_event mipsxxcore_event_map
 				[PERF_COUNT_HW_MAX] = {
 	[PERF_COUNT_HW_CPU_CYCLES] = { 0x00, CNTR_EVEN | CNTR_ODD, P },
 	[PERF_COUNT_HW_INSTRUCTIONS] = { 0x01, CNTR_EVEN | CNTR_ODD, T },
-	[PERF_COUNT_HW_CACHE_REFERENCES] = { UNSUPPORTED_PERF_EVENT_ID },
-	[PERF_COUNT_HW_CACHE_MISSES] = { UNSUPPORTED_PERF_EVENT_ID },
 	[PERF_COUNT_HW_BRANCH_INSTRUCTIONS] = { 0x02, CNTR_EVEN, T },
 	[PERF_COUNT_HW_BRANCH_MISSES] = { 0x02, CNTR_ODD, T },
-	[PERF_COUNT_HW_BUS_CYCLES] = { UNSUPPORTED_PERF_EVENT_ID },
 };
 
 /* 74K core has different branch event code. */
@@ -812,11 +805,8 @@ static const struct mips_perf_event mipsxx74Kcore_event_map
 				[PERF_COUNT_HW_MAX] = {
 	[PERF_COUNT_HW_CPU_CYCLES] = { 0x00, CNTR_EVEN | CNTR_ODD, P },
 	[PERF_COUNT_HW_INSTRUCTIONS] = { 0x01, CNTR_EVEN | CNTR_ODD, T },
-	[PERF_COUNT_HW_CACHE_REFERENCES] = { UNSUPPORTED_PERF_EVENT_ID },
-	[PERF_COUNT_HW_CACHE_MISSES] = { UNSUPPORTED_PERF_EVENT_ID },
 	[PERF_COUNT_HW_BRANCH_INSTRUCTIONS] = { 0x27, CNTR_EVEN, T },
 	[PERF_COUNT_HW_BRANCH_MISSES] = { 0x27, CNTR_ODD, T },
-	[PERF_COUNT_HW_BUS_CYCLES] = { UNSUPPORTED_PERF_EVENT_ID },
 };
 
 static const struct mips_perf_event octeon_event_map[PERF_COUNT_HW_MAX] = {
@@ -849,10 +839,6 @@ static const struct mips_perf_event mipsxxcore_cache_map
 		[C(RESULT_ACCESS)]	= { 0x0a, CNTR_EVEN, T },
 		[C(RESULT_MISS)]	= { 0x0b, CNTR_EVEN | CNTR_ODD, T },
 	},
-	[C(OP_PREFETCH)] = {
-		[C(RESULT_ACCESS)]	= { UNSUPPORTED_PERF_EVENT_ID },
-		[C(RESULT_MISS)]	= { UNSUPPORTED_PERF_EVENT_ID },
-	},
 },
 [C(L1I)] = {
 	[C(OP_READ)] = {
@@ -869,7 +855,6 @@ static const struct mips_perf_event mipsxxcore_cache_map
 		 * Note that MIPS has only "hit" events countable for
 		 * the prefetch operation.
 		 */
-		[C(RESULT_MISS)]	= { UNSUPPORTED_PERF_EVENT_ID },
 	},
 },
 [C(LL)] = {
@@ -881,10 +866,6 @@ static const struct mips_perf_event mipsxxcore_cache_map
 		[C(RESULT_ACCESS)]	= { 0x15, CNTR_ODD, P },
 		[C(RESULT_MISS)]	= { 0x16, CNTR_EVEN, P },
 	},
-	[C(OP_PREFETCH)] = {
-		[C(RESULT_ACCESS)]	= { UNSUPPORTED_PERF_EVENT_ID },
-		[C(RESULT_MISS)]	= { UNSUPPORTED_PERF_EVENT_ID },
-	},
 },
 [C(DTLB)] = {
 	[C(OP_READ)] = {
@@ -895,10 +876,6 @@ static const struct mips_perf_event mipsxxcore_cache_map
 		[C(RESULT_ACCESS)]	= { 0x06, CNTR_EVEN, T },
 		[C(RESULT_MISS)]	= { 0x06, CNTR_ODD, T },
 	},
-	[C(OP_PREFETCH)] = {
-		[C(RESULT_ACCESS)]	= { UNSUPPORTED_PERF_EVENT_ID },
-		[C(RESULT_MISS)]	= { UNSUPPORTED_PERF_EVENT_ID },
-	},
 },
 [C(ITLB)] = {
 	[C(OP_READ)] = {
@@ -909,10 +886,6 @@ static const struct mips_perf_event mipsxxcore_cache_map
 		[C(RESULT_ACCESS)]	= { 0x05, CNTR_EVEN, T },
 		[C(RESULT_MISS)]	= { 0x05, CNTR_ODD, T },
 	},
-	[C(OP_PREFETCH)] = {
-		[C(RESULT_ACCESS)]	= { UNSUPPORTED_PERF_EVENT_ID },
-		[C(RESULT_MISS)]	= { UNSUPPORTED_PERF_EVENT_ID },
-	},
 },
 [C(BPU)] = {
 	/* Using the same code for *HW_BRANCH* */
@@ -924,24 +897,6 @@ static const struct mips_perf_event mipsxxcore_cache_map
 		[C(RESULT_ACCESS)]	= { 0x02, CNTR_EVEN, T },
 		[C(RESULT_MISS)]	= { 0x02, CNTR_ODD, T },
 	},
-	[C(OP_PREFETCH)] = {
-		[C(RESULT_ACCESS)]	= { UNSUPPORTED_PERF_EVENT_ID },
-		[C(RESULT_MISS)]	= { UNSUPPORTED_PERF_EVENT_ID },
-	},
-},
-[C(NODE)] = {
-	[C(OP_READ)] = {
-		[C(RESULT_ACCESS)]	= { UNSUPPORTED_PERF_EVENT_ID },
-		[C(RESULT_MISS)]	= { UNSUPPORTED_PERF_EVENT_ID },
-	},
-	[C(OP_WRITE)] = {
-		[C(RESULT_ACCESS)]	= { UNSUPPORTED_PERF_EVENT_ID },
-		[C(RESULT_MISS)]	= { UNSUPPORTED_PERF_EVENT_ID },
-	},
-	[C(OP_PREFETCH)] = {
-		[C(RESULT_ACCESS)]	= { UNSUPPORTED_PERF_EVENT_ID },
-		[C(RESULT_MISS)]	= { UNSUPPORTED_PERF_EVENT_ID },
-	},
 },
 };
 
@@ -965,10 +920,6 @@ static const struct mips_perf_event mipsxx74Kcore_cache_map
 		[C(RESULT_ACCESS)]	= { 0x17, CNTR_ODD, T },
 		[C(RESULT_MISS)]	= { 0x18, CNTR_ODD, T },
 	},
-	[C(OP_PREFETCH)] = {
-		[C(RESULT_ACCESS)]	= { UNSUPPORTED_PERF_EVENT_ID },
-		[C(RESULT_MISS)]	= { UNSUPPORTED_PERF_EVENT_ID },
-	},
 },
 [C(L1I)] = {
 	[C(OP_READ)] = {
@@ -985,7 +936,6 @@ static const struct mips_perf_event mipsxx74Kcore_cache_map
 		 * Note that MIPS has only "hit" events countable for
 		 * the prefetch operation.
 		 */
-		[C(RESULT_MISS)]	= { UNSUPPORTED_PERF_EVENT_ID },
 	},
 },
 [C(LL)] = {
@@ -997,25 +947,6 @@ static const struct mips_perf_event mipsxx74Kcore_cache_map
 		[C(RESULT_ACCESS)]	= { 0x1c, CNTR_ODD, P },
 		[C(RESULT_MISS)]	= { 0x1d, CNTR_EVEN | CNTR_ODD, P },
 	},
-	[C(OP_PREFETCH)] = {
-		[C(RESULT_ACCESS)]	= { UNSUPPORTED_PERF_EVENT_ID },
-		[C(RESULT_MISS)]	= { UNSUPPORTED_PERF_EVENT_ID },
-	},
-},
-[C(DTLB)] = {
-	/* 74K core does not have specific DTLB events. */
-	[C(OP_READ)] = {
-		[C(RESULT_ACCESS)]	= { UNSUPPORTED_PERF_EVENT_ID },
-		[C(RESULT_MISS)]	= { UNSUPPORTED_PERF_EVENT_ID },
-	},
-	[C(OP_WRITE)] = {
-		[C(RESULT_ACCESS)]	= { UNSUPPORTED_PERF_EVENT_ID },
-		[C(RESULT_MISS)]	= { UNSUPPORTED_PERF_EVENT_ID },
-	},
-	[C(OP_PREFETCH)] = {
-		[C(RESULT_ACCESS)]	= { UNSUPPORTED_PERF_EVENT_ID },
-		[C(RESULT_MISS)]	= { UNSUPPORTED_PERF_EVENT_ID },
-	},
 },
 [C(ITLB)] = {
 	[C(OP_READ)] = {
@@ -1026,10 +957,6 @@ static const struct mips_perf_event mipsxx74Kcore_cache_map
 		[C(RESULT_ACCESS)]	= { 0x04, CNTR_EVEN, T },
 		[C(RESULT_MISS)]	= { 0x04, CNTR_ODD, T },
 	},
-	[C(OP_PREFETCH)] = {
-		[C(RESULT_ACCESS)]	= { UNSUPPORTED_PERF_EVENT_ID },
-		[C(RESULT_MISS)]	= { UNSUPPORTED_PERF_EVENT_ID },
-	},
 },
 [C(BPU)] = {
 	/* Using the same code for *HW_BRANCH* */
@@ -1041,24 +968,6 @@ static const struct mips_perf_event mipsxx74Kcore_cache_map
 		[C(RESULT_ACCESS)]	= { 0x27, CNTR_EVEN, T },
 		[C(RESULT_MISS)]	= { 0x27, CNTR_ODD, T },
 	},
-	[C(OP_PREFETCH)] = {
-		[C(RESULT_ACCESS)]	= { UNSUPPORTED_PERF_EVENT_ID },
-		[C(RESULT_MISS)]	= { UNSUPPORTED_PERF_EVENT_ID },
-	},
-},
-[C(NODE)] = {
-	[C(OP_READ)] = {
-		[C(RESULT_ACCESS)]	= { UNSUPPORTED_PERF_EVENT_ID },
-		[C(RESULT_MISS)]	= { UNSUPPORTED_PERF_EVENT_ID },
-	},
-	[C(OP_WRITE)] = {
-		[C(RESULT_ACCESS)]	= { UNSUPPORTED_PERF_EVENT_ID },
-		[C(RESULT_MISS)]	= { UNSUPPORTED_PERF_EVENT_ID },
-	},
-	[C(OP_PREFETCH)] = {
-		[C(RESULT_ACCESS)]	= { UNSUPPORTED_PERF_EVENT_ID },
-		[C(RESULT_MISS)]	= { UNSUPPORTED_PERF_EVENT_ID },
-	},
 },
 };
 
@@ -1074,39 +983,14 @@ static const struct mips_perf_event octeon_cache_map
 	},
 	[C(OP_WRITE)] = {
 		[C(RESULT_ACCESS)]	= { 0x30, CNTR_ALL },
-		[C(RESULT_MISS)]	= { UNSUPPORTED_PERF_EVENT_ID },
-	},
-	[C(OP_PREFETCH)] = {
-		[C(RESULT_ACCESS)]	= { UNSUPPORTED_PERF_EVENT_ID },
-		[C(RESULT_MISS)]	= { UNSUPPORTED_PERF_EVENT_ID },
 	},
 },
 [C(L1I)] = {
 	[C(OP_READ)] = {
 		[C(RESULT_ACCESS)]	= { 0x18, CNTR_ALL },
-		[C(RESULT_MISS)]	= { UNSUPPORTED_PERF_EVENT_ID },
-	},
-	[C(OP_WRITE)] = {
-		[C(RESULT_ACCESS)]	= { UNSUPPORTED_PERF_EVENT_ID },
-		[C(RESULT_MISS)]	= { UNSUPPORTED_PERF_EVENT_ID },
 	},
 	[C(OP_PREFETCH)] = {
 		[C(RESULT_ACCESS)]	= { 0x19, CNTR_ALL },
-		[C(RESULT_MISS)]	= { UNSUPPORTED_PERF_EVENT_ID },
-	},
-},
-[C(LL)] = {
-	[C(OP_READ)] = {
-		[C(RESULT_ACCESS)]	= { UNSUPPORTED_PERF_EVENT_ID },
-		[C(RESULT_MISS)]	= { UNSUPPORTED_PERF_EVENT_ID },
-	},
-	[C(OP_WRITE)] = {
-		[C(RESULT_ACCESS)]	= { UNSUPPORTED_PERF_EVENT_ID },
-		[C(RESULT_MISS)]	= { UNSUPPORTED_PERF_EVENT_ID },
-	},
-	[C(OP_PREFETCH)] = {
-		[C(RESULT_ACCESS)]	= { UNSUPPORTED_PERF_EVENT_ID },
-		[C(RESULT_MISS)]	= { UNSUPPORTED_PERF_EVENT_ID },
 	},
 },
 [C(DTLB)] = {
@@ -1115,46 +999,16 @@ static const struct mips_perf_event octeon_cache_map
 	 * read and write.
 	 */
 	[C(OP_READ)] = {
-		[C(RESULT_ACCESS)]	= { UNSUPPORTED_PERF_EVENT_ID },
 		[C(RESULT_MISS)]	= { 0x35, CNTR_ALL },
 	},
 	[C(OP_WRITE)] = {
-		[C(RESULT_ACCESS)]	= { UNSUPPORTED_PERF_EVENT_ID },
 		[C(RESULT_MISS)]	= { 0x35, CNTR_ALL },
 	},
-	[C(OP_PREFETCH)] = {
-		[C(RESULT_ACCESS)]	= { UNSUPPORTED_PERF_EVENT_ID },
-		[C(RESULT_MISS)]	= { UNSUPPORTED_PERF_EVENT_ID },
-	},
 },
 [C(ITLB)] = {
 	[C(OP_READ)] = {
-		[C(RESULT_ACCESS)]	= { UNSUPPORTED_PERF_EVENT_ID },
 		[C(RESULT_MISS)]	= { 0x37, CNTR_ALL },
 	},
-	[C(OP_WRITE)] = {
-		[C(RESULT_ACCESS)]	= { UNSUPPORTED_PERF_EVENT_ID },
-		[C(RESULT_MISS)]	= { UNSUPPORTED_PERF_EVENT_ID },
-	},
-	[C(OP_PREFETCH)] = {
-		[C(RESULT_ACCESS)]	= { UNSUPPORTED_PERF_EVENT_ID },
-		[C(RESULT_MISS)]	= { UNSUPPORTED_PERF_EVENT_ID },
-	},
-},
-[C(BPU)] = {
-	/* Using the same code for *HW_BRANCH* */
-	[C(OP_READ)] = {
-		[C(RESULT_ACCESS)]	= { UNSUPPORTED_PERF_EVENT_ID },
-		[C(RESULT_MISS)]	= { UNSUPPORTED_PERF_EVENT_ID },
-	},
-	[C(OP_WRITE)] = {
-		[C(RESULT_ACCESS)]	= { UNSUPPORTED_PERF_EVENT_ID },
-		[C(RESULT_MISS)]	= { UNSUPPORTED_PERF_EVENT_ID },
-	},
-	[C(OP_PREFETCH)] = {
-		[C(RESULT_ACCESS)]	= { UNSUPPORTED_PERF_EVENT_ID },
-		[C(RESULT_MISS)]	= { UNSUPPORTED_PERF_EVENT_ID },
-	},
 },
 };