perf/marvell: Refactor to extract PMU operations

Introduce a refactor to the Marvell DDR PMU driver to extract
PMU operations ("pmu ops") from the existing driver.

Reviewed-by: Jonathan Cameron <[email protected]>
Signed-off-by: Gowthami Thiagarajan <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Will Deacon <[email protected]>

Author: Gowthami Thiagarajan

drivers/perf/marvell_cn10k_ddr_pmu.c

@@ -127,6 +127,7 @@ struct cn10k_ddr_pmu {
 	struct pmu pmu;
 	void __iomem *base;
 	const struct ddr_pmu_platform_data *p_data;
+	const struct ddr_pmu_ops *ops;
 	unsigned int cpu;
 	struct	device *dev;
 	int active_events;
@@ -135,6 +136,16 @@ struct cn10k_ddr_pmu {
 	struct hlist_node node;
 };
 
+struct ddr_pmu_ops {
+	void (*enable_read_freerun_counter)(struct cn10k_ddr_pmu *pmu,
+					    bool enable);
+	void (*enable_write_freerun_counter)(struct cn10k_ddr_pmu *pmu,
+					     bool enable);
+	void (*clear_read_freerun_counter)(struct cn10k_ddr_pmu *pmu);
+	void (*clear_write_freerun_counter)(struct cn10k_ddr_pmu *pmu);
+	void (*pmu_overflow_handler)(struct cn10k_ddr_pmu *pmu, int evt_idx);
+};
+
 #define to_cn10k_ddr_pmu(p)	container_of(p, struct cn10k_ddr_pmu, pmu)
 
 struct ddr_pmu_platform_data {
@@ -375,6 +386,7 @@ static void cn10k_ddr_perf_counter_enable(struct cn10k_ddr_pmu *pmu,
 					  int counter, bool enable)
 {
 	const struct ddr_pmu_platform_data *p_data = pmu->p_data;
+	const struct ddr_pmu_ops *ops = pmu->ops;
 	u32 reg;
 	u64 val;
 
@@ -394,21 +406,10 @@ static void cn10k_ddr_perf_counter_enable(struct cn10k_ddr_pmu *pmu,
 
 		writeq_relaxed(val, pmu->base + reg);
 	} else {
-		val = readq_relaxed(pmu->base +
-				    p_data->cnt_freerun_en);
-		if (enable) {
-			if (counter == DDRC_PERF_READ_COUNTER_IDX)
-				val |= DDRC_PERF_FREERUN_READ_EN;
-			else
-				val |= DDRC_PERF_FREERUN_WRITE_EN;
-		} else {
-			if (counter == DDRC_PERF_READ_COUNTER_IDX)
-				val &= ~DDRC_PERF_FREERUN_READ_EN;
-			else
-				val &= ~DDRC_PERF_FREERUN_WRITE_EN;
-		}
-		writeq_relaxed(val, pmu->base +
-			       p_data->cnt_freerun_en);
+		if (counter == DDRC_PERF_READ_COUNTER_IDX)
+			ops->enable_read_freerun_counter(pmu, enable);
+		else
+			ops->enable_write_freerun_counter(pmu, enable);
 	}
 }
 
@@ -464,6 +465,7 @@ static int cn10k_ddr_perf_event_add(struct perf_event *event, int flags)
 {
 	struct cn10k_ddr_pmu *pmu = to_cn10k_ddr_pmu(event->pmu);
 	const struct ddr_pmu_platform_data *p_data = pmu->p_data;
+	const struct ddr_pmu_ops *ops = pmu->ops;
 	struct hw_perf_event *hwc = &event->hw;
 	u8 config = event->attr.config;
 	int counter, ret;
@@ -492,11 +494,9 @@ static int cn10k_ddr_perf_event_add(struct perf_event *event, int flags)
 	} else {
 		/* fixed event counter, clear counter value */
 		if (counter == DDRC_PERF_READ_COUNTER_IDX)
-			val = DDRC_FREERUN_READ_CNT_CLR;
+			ops->clear_read_freerun_counter(pmu);
 		else
-			val = DDRC_FREERUN_WRITE_CNT_CLR;
-
-		writeq_relaxed(val, pmu->base + p_data->cnt_freerun_ctrl);
+			ops->clear_write_freerun_counter(pmu);
 	}
 
 	hwc->state |= PERF_HES_STOPPED;
@@ -578,9 +578,63 @@ static void cn10k_ddr_perf_event_update_all(struct cn10k_ddr_pmu *pmu)
 	}
 }
 
+static void ddr_pmu_enable_read_freerun(struct cn10k_ddr_pmu *pmu, bool enable)
+{
+	const struct ddr_pmu_platform_data *p_data = pmu->p_data;
+	u64 val;
+
+	val = readq_relaxed(pmu->base + p_data->cnt_freerun_en);
+	if (enable)
+		val |= DDRC_PERF_FREERUN_READ_EN;
+	else
+		val &= ~DDRC_PERF_FREERUN_READ_EN;
+
+	writeq_relaxed(val, pmu->base + p_data->cnt_freerun_en);
+}
+
+static void ddr_pmu_enable_write_freerun(struct cn10k_ddr_pmu *pmu, bool enable)
+{
+	const struct ddr_pmu_platform_data *p_data = pmu->p_data;
+	u64 val;
+
+	val = readq_relaxed(pmu->base + p_data->cnt_freerun_en);
+	if (enable)
+		val |= DDRC_PERF_FREERUN_WRITE_EN;
+	else
+		val &= ~DDRC_PERF_FREERUN_WRITE_EN;
+
+	writeq_relaxed(val, pmu->base + p_data->cnt_freerun_en);
+}
+
+static void ddr_pmu_read_clear_freerun(struct cn10k_ddr_pmu *pmu)
+{
+	const struct ddr_pmu_platform_data *p_data = pmu->p_data;
+	u64 val;
+
+	val = DDRC_FREERUN_READ_CNT_CLR;
+	writeq_relaxed(val, pmu->base + p_data->cnt_freerun_ctrl);
+}
+
+static void ddr_pmu_write_clear_freerun(struct cn10k_ddr_pmu *pmu)
+{
+	const struct ddr_pmu_platform_data *p_data = pmu->p_data;
+	u64 val;
+
+	val = DDRC_FREERUN_WRITE_CNT_CLR;
+	writeq_relaxed(val, pmu->base + p_data->cnt_freerun_ctrl);
+}
+
+static void ddr_pmu_overflow_hander(struct cn10k_ddr_pmu *pmu, int evt_idx)
+{
+	cn10k_ddr_perf_event_update_all(pmu);
+	cn10k_ddr_perf_pmu_disable(&pmu->pmu);
+	cn10k_ddr_perf_pmu_enable(&pmu->pmu);
+}
+
 static irqreturn_t cn10k_ddr_pmu_overflow_handler(struct cn10k_ddr_pmu *pmu)
 {
 	const struct ddr_pmu_platform_data *p_data = pmu->p_data;
+	const struct ddr_pmu_ops *ops = pmu->ops;
 	struct perf_event *event;
 	struct hw_perf_event *hwc;
 	u64 prev_count, new_count;
@@ -620,9 +674,7 @@ static irqreturn_t cn10k_ddr_pmu_overflow_handler(struct cn10k_ddr_pmu *pmu)
 		value = cn10k_ddr_perf_read_counter(pmu, i);
 		if (value == p_data->counter_max_val) {
 			pr_info("Counter-(%d) reached max value\n", i);
-			cn10k_ddr_perf_event_update_all(pmu);
-			cn10k_ddr_perf_pmu_disable(&pmu->pmu);
-			cn10k_ddr_perf_pmu_enable(&pmu->pmu);
+			ops->pmu_overflow_handler(pmu, i);
 		}
 	}
 
@@ -661,6 +713,14 @@ static int cn10k_ddr_pmu_offline_cpu(unsigned int cpu, struct hlist_node *node)
 	return 0;
 }
 
+static const struct ddr_pmu_ops ddr_pmu_ops = {
+	.enable_read_freerun_counter = ddr_pmu_enable_read_freerun,
+	.enable_write_freerun_counter = ddr_pmu_enable_write_freerun,
+	.clear_read_freerun_counter = ddr_pmu_read_clear_freerun,
+	.clear_write_freerun_counter = ddr_pmu_write_clear_freerun,
+	.pmu_overflow_handler = ddr_pmu_overflow_hander,
+};
+
 #if defined(CONFIG_ACPI) || defined(CONFIG_OF)
 static const struct ddr_pmu_platform_data cn10k_ddr_pmu_pdata = {
 	.counter_overflow_val =  BIT_ULL(48),
@@ -713,6 +773,7 @@ static int cn10k_ddr_perf_probe(struct platform_device *pdev)
 	is_cn10k = ddr_pmu->p_data->is_cn10k;
 
 	if (is_cn10k) {
+		ddr_pmu->ops = &ddr_pmu_ops;
 		/* Setup the PMU counter to work in manual mode */
 		writeq_relaxed(OP_MODE_CTRL_VAL_MANUAL, ddr_pmu->base +
 			       ddr_pmu->p_data->cnt_op_mode_ctrl);