ARM: perf: add _init() functions to PMUs

In preparation for separating the PMU-specific code, this patch adds
self-contained init functions to each PMU, therefore removing any
PMU-specific knowledge from the PMU-agnostic init_hw_perf_events
function.
Acked-by: NJamie Iles <jamie@jamieiles.com>
Acked-by: NJean Pihet <j-pihet@ti.com>
Signed-off-by: NWill Deacon <will.deacon@arm.com>

arch/arm/kernel/perf_event.c

@@ -1240,6 +1240,11 @@ static const struct arm_pmu armv6pmu = {
 	.max_period		= (1LLU << 32) - 1,
 };
 
+const struct arm_pmu *__init armv6pmu_init(void)
+{
+	return &armv6pmu;
+}
+
 /*
  * ARMv6mpcore is almost identical to single core ARMv6 with the exception
  * that some of the events have different enumerations and that there is no
@@ -1264,6 +1269,11 @@ static const struct arm_pmu armv6mpcore_pmu = {
 	.max_period		= (1LLU << 32) - 1,
 };
 
+const struct arm_pmu *__init armv6mpcore_pmu_init(void)
+{
+	return &armv6mpcore_pmu;
+}
+
 /*
  * ARMv7 Cortex-A8 and Cortex-A9 Performance Events handling code.
  *
@@ -2136,6 +2146,25 @@ static u32 __init armv7_reset_read_pmnc(void)
 	return nb_cnt + 1;
 }
 
+const struct arm_pmu *__init armv7_a8_pmu_init(void)
+{
+	armv7pmu.id		= ARM_PERF_PMU_ID_CA8;
+	armv7pmu.cache_map	= &armv7_a8_perf_cache_map;
+	armv7pmu.event_map	= &armv7_a8_perf_map;
+	armv7pmu.num_events	= armv7_reset_read_pmnc();
+	return &armv7pmu;
+}
+
+const struct arm_pmu *__init armv7_a9_pmu_init(void)
+{
+	armv7pmu.id		= ARM_PERF_PMU_ID_CA9;
+	armv7pmu.cache_map	= &armv7_a9_perf_cache_map;
+	armv7pmu.event_map	= &armv7_a9_perf_map;
+	armv7pmu.num_events	= armv7_reset_read_pmnc();
+	return &armv7pmu;
+}
+
+
 /*
  * ARMv5 [xscale] Performance counter handling code.
  *
@@ -2564,6 +2593,11 @@ static const struct arm_pmu xscale1pmu = {
 	.max_period	= (1LLU << 32) - 1,
 };
 
+const struct arm_pmu *__init xscale1pmu_init(void)
+{
+	return &xscale1pmu;
+}
+
 #define XSCALE2_OVERFLOWED_MASK	0x01f
 #define XSCALE2_CCOUNT_OVERFLOW	0x001
 #define XSCALE2_COUNT0_OVERFLOW	0x002
@@ -2920,6 +2954,11 @@ static const struct arm_pmu xscale2pmu = {
 	.max_period	= (1LLU << 32) - 1,
 };
 
+const struct arm_pmu *__init xscale2pmu_init(void)
+{
+	return &xscale2pmu;
+}
+
 static int __init
 init_hw_perf_events(void)
 {
@@ -2933,30 +2972,16 @@ init_hw_perf_events(void)
 		case 0xB360:	/* ARM1136 */
 		case 0xB560:	/* ARM1156 */
 		case 0xB760:	/* ARM1176 */
-			armpmu = &armv6pmu;
+			armpmu = armv6pmu_init();
 			break;
 		case 0xB020:	/* ARM11mpcore */
-			armpmu = &armv6mpcore_pmu;
+			armpmu = armv6mpcore_pmu_init();
 			break;
 		case 0xC080:	/* Cortex-A8 */
-			armv7pmu.id = ARM_PERF_PMU_ID_CA8;
-			armv7pmu.cache_map = &armv7_a8_perf_cache_map;
-			armv7pmu.event_map = &armv7_a8_perf_map;
-			armpmu = &armv7pmu;
-
-			/* Reset PMNC and read the nb of CNTx counters
-			    supported */
-			armv7pmu.num_events = armv7_reset_read_pmnc();
+			armpmu = armv7_a8_pmu_init();
 			break;
 		case 0xC090:	/* Cortex-A9 */
-			armv7pmu.id = ARM_PERF_PMU_ID_CA9;
-			armv7pmu.cache_map = &armv7_a9_perf_cache_map;
-			armv7pmu.event_map = &armv7_a9_perf_map;
-			armpmu = &armv7pmu;
-
-			/* Reset PMNC and read the nb of CNTx counters
-			    supported */
-			armv7pmu.num_events = armv7_reset_read_pmnc();
+			armpmu = armv7_a9_pmu_init();
 			break;
 		}
 	/* Intel CPUs [xscale]. */
@@ -2964,10 +2989,10 @@ init_hw_perf_events(void)
 		part_number = (cpuid >> 13) & 0x7;
 		switch (part_number) {
 		case 1:
-			armpmu = &xscale1pmu;
+			armpmu = xscale1pmu_init();
 			break;
 		case 2:
-			armpmu = &xscale2pmu;
+			armpmu = xscale2pmu_init();
 			break;
 		}
 	}