linux-kernel - [PATCH v7 03/11] arm: perf: Use GENMASK for PMMIR fields

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Date:   Mon, 11 Dec 2023 16:13:15 +0000
From:   James Clark <james.clark@....com>
To:     linux-arm-kernel@...ts.infradead.org,
        linux-perf-users@...r.kernel.org, suzuki.poulose@....com,
        will@...nel.org, mark.rutland@....com, anshuman.khandual@....com
Cc:     namhyung@...il.com, James Clark <james.clark@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Jonathan Corbet <corbet@....net>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Ian Rogers <irogers@...gle.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Russell King <linux@...linux.org.uk>,
        Marc Zyngier <maz@...nel.org>,
        Oliver Upton <oliver.upton@...ux.dev>,
        James Morse <james.morse@....com>,
        Zenghui Yu <yuzenghui@...wei.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Shuah Khan <shuah@...nel.org>,
        Zaid Al-Bassam <zalbassam@...gle.com>,
        Raghavendra Rao Ananta <rananta@...gle.com>,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        kvmarm@...ts.linux.dev, kvm@...r.kernel.org,
        linux-kselftest@...r.kernel.org
Subject: [PATCH v7 03/11] arm: perf: Use GENMASK for PMMIR fields

This is so that FIELD_GET and FIELD_PREP can be used and that the fields
are in a consistent format to arm64/tools/sysreg

Signed-off-by: James Clark <james.clark@....com>
---
 drivers/perf/arm_pmuv3.c       | 8 +++-----
 include/linux/perf/arm_pmuv3.h | 9 +++------
 2 files changed, 6 insertions(+), 11 deletions(-)

diff --git a/drivers/perf/arm_pmuv3.c b/drivers/perf/arm_pmuv3.c
index e424de5dd44f..7b2c1d03464a 100644
--- a/drivers/perf/arm_pmuv3.c
+++ b/drivers/perf/arm_pmuv3.c
@@ -328,7 +328,7 @@ static ssize_t slots_show(struct device *dev, struct device_attribute *attr,
 {
 	struct pmu *pmu = dev_get_drvdata(dev);
 	struct arm_pmu *cpu_pmu = container_of(pmu, struct arm_pmu, pmu);
-	u32 slots = cpu_pmu->reg_pmmir & ARMV8_PMU_SLOTS_MASK;
+	u32 slots = FIELD_GET(ARMV8_PMU_SLOTS, cpu_pmu->reg_pmmir);
 
 	return sysfs_emit(page, "0x%08x\n", slots);
 }
@@ -340,8 +340,7 @@ static ssize_t bus_slots_show(struct device *dev, struct device_attribute *attr,
 {
 	struct pmu *pmu = dev_get_drvdata(dev);
 	struct arm_pmu *cpu_pmu = container_of(pmu, struct arm_pmu, pmu);
-	u32 bus_slots = (cpu_pmu->reg_pmmir >> ARMV8_PMU_BUS_SLOTS_SHIFT)
-			& ARMV8_PMU_BUS_SLOTS_MASK;
+	u32 bus_slots = FIELD_GET(ARMV8_PMU_BUS_SLOTS, cpu_pmu->reg_pmmir);
 
 	return sysfs_emit(page, "0x%08x\n", bus_slots);
 }
@@ -353,8 +352,7 @@ static ssize_t bus_width_show(struct device *dev, struct device_attribute *attr,
 {
 	struct pmu *pmu = dev_get_drvdata(dev);
 	struct arm_pmu *cpu_pmu = container_of(pmu, struct arm_pmu, pmu);
-	u32 bus_width = (cpu_pmu->reg_pmmir >> ARMV8_PMU_BUS_WIDTH_SHIFT)
-			& ARMV8_PMU_BUS_WIDTH_MASK;
+	u32 bus_width = FIELD_GET(ARMV8_PMU_BUS_WIDTH, cpu_pmu->reg_pmmir);
 	u32 val = 0;
 
 	/* Encoded as Log2(number of bytes), plus one */
diff --git a/include/linux/perf/arm_pmuv3.h b/include/linux/perf/arm_pmuv3.h
index ed62bd75cec7..1bc7678c10d4 100644
--- a/include/linux/perf/arm_pmuv3.h
+++ b/include/linux/perf/arm_pmuv3.h
@@ -250,12 +250,9 @@
 #define ARMV8_PMU_USERENR_ER	(1 << 3) /* Event counter can be read at EL0 */
 
 /* PMMIR_EL1.SLOTS mask */
-#define ARMV8_PMU_SLOTS_MASK	0xff
-
-#define ARMV8_PMU_BUS_SLOTS_SHIFT 8
-#define ARMV8_PMU_BUS_SLOTS_MASK 0xff
-#define ARMV8_PMU_BUS_WIDTH_SHIFT 16
-#define ARMV8_PMU_BUS_WIDTH_MASK 0xf
+#define ARMV8_PMU_SLOTS		GENMASK(7, 0)
+#define ARMV8_PMU_BUS_SLOTS	GENMASK(15, 8)
+#define ARMV8_PMU_BUS_WIDTH	GENMASK(19, 16)
 
 /*
  * This code is really good
-- 
2.34.1