[PATCH v2 3/8] perf: pmuv3: Abstract PMU version checks

[Zaid Al-Bassam]

The current PMU version definitions are available for arm64 only,
As we want to add PMUv3 support to arm (32-bit), abstracts
these definitions by using arch-specific helpers.

Signed-off-by: Zaid Al-Bassam <zalbassam at google.com>
Signed-off-by: Marc Zyngier <maz at kernel.org>
Link: https://lore.kernel.org/r/20230126204444.2204061-4-zalbassam@google.com
---
 arch/arm64/include/asm/arm_pmuv3.h | 16 ++++++++++++++++
 drivers/perf/arm_pmuv3.c           |  7 +++----
 2 files changed, 19 insertions(+), 4 deletions(-)

diff --git a/arch/arm64/include/asm/arm_pmuv3.h b/arch/arm64/include/asm/arm_pmuv3.h
index eb204adb8dee2..b13651a06adf9 100644
--- a/arch/arm64/include/asm/arm_pmuv3.h
+++ b/arch/arm64/include/asm/arm_pmuv3.h
@@ -146,4 +146,20 @@ static inline u32 read_pmceid1(void)
 	return read_sysreg(pmceid1_el0);
 }
 
+static inline bool pmuv3_implemented(int pmuver)
+{
+	return !(pmuver == ID_AA64DFR0_EL1_PMUVer_IMP_DEF ||
+		 pmuver == ID_AA64DFR0_EL1_PMUVer_NI);
+}
+
+static inline bool is_pmuv3p4(int pmuver)
+{
+	return pmuver >= ID_AA64DFR0_EL1_PMUVer_V3P4;
+}
+
+static inline bool is_pmuv3p5(int pmuver)
+{
+	return pmuver >= ID_AA64DFR0_EL1_PMUVer_V3P5;
+}
+
 #endif
diff --git a/drivers/perf/arm_pmuv3.c b/drivers/perf/arm_pmuv3.c
index 94e4098b662d3..46e89e92f8236 100644
--- a/drivers/perf/arm_pmuv3.c
+++ b/drivers/perf/arm_pmuv3.c
@@ -392,7 +392,7 @@ static const struct attribute_group armv8_pmuv3_caps_attr_group = {
  */
 static bool armv8pmu_has_long_event(struct arm_pmu *cpu_pmu)
 {
-	return (cpu_pmu->pmuver >= ID_AA64DFR0_EL1_PMUVer_V3P5);
+	return (is_pmuv3p5(cpu_pmu->pmuver));
 }
 
 static inline bool armv8pmu_event_has_user_read(struct perf_event *event)
@@ -1082,8 +1082,7 @@ static void __armv8pmu_probe_pmu(void *info)
 	int pmuver;
 
 	pmuver = read_pmuver();
-	if (pmuver == ID_AA64DFR0_EL1_PMUVer_IMP_DEF ||
-	    pmuver == ID_AA64DFR0_EL1_PMUVer_NI)
+	if (!pmuv3_implemented(pmuver))
 		return;
 
 	cpu_pmu->pmuver = pmuver;
@@ -1109,7 +1108,7 @@ static void __armv8pmu_probe_pmu(void *info)
 			     pmceid, ARMV8_PMUV3_MAX_COMMON_EVENTS);
 
 	/* store PMMIR register for sysfs */
-	if (pmuver >= ID_AA64DFR0_EL1_PMUVer_V3P4 && (pmceid_raw[1] & BIT(31)))
+	if (is_pmuv3p4(pmuver) && (pmceid_raw[1] & BIT(31)))
 		cpu_pmu->reg_pmmir = read_pmmir();
 	else
 		cpu_pmu->reg_pmmir = 0;
-- 
2.39.1.581.gbfd45094c4-goog