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: Jamie Iles <jamie@jamieiles.com>
Acked-by: Jean Pihet <j-pihet@ti.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>

1 files changed, 45 insertions, 20 deletions

diff --git a/arch/arm/kernel/perf_event.c b/arch/arm/kernel/perf_event.c
index 35319b8e4d4b..acc4e91dd300 100644
--- a/arch/arm/kernel/perf_event.c
+++ b/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;
                 }
         }