perf: imx_perf: add macro definitions for parsing config attr

The user can set event and counter in cmdline and the driver need to parse
it using 'config' attr value. This will add macro definitions to avoid
hard-code in driver.
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Signed-off-by: Xu Yang <xu.yang_2@nxp.com>
Link: https://lore.kernel.org/r/20240529080358.703784-2-xu.yang_2@nxp.comSigned-off-by: Will Deacon <will@kernel.org>

drivers/perf/fsl_imx9_ddr_perf.c

@@ -42,6 +42,9 @@
 #define NUM_COUNTERS		11
 #define CYCLES_COUNTER		0
 
+#define CONFIG_EVENT_MASK	GENMASK(7, 0)
+#define CONFIG_COUNTER_MASK	GENMASK(15, 8)
+
 #define to_ddr_pmu(p)		container_of(p, struct ddr_pmu, pmu)
 
 #define DDR_PERF_DEV_NAME	"imx9_ddr"
@@ -339,8 +342,10 @@ static void ddr_perf_counter_local_config(struct ddr_pmu *pmu, int config,
 				    int counter, bool enable)
 {
 	u32 ctrl_a;
+	int event;
 
 	ctrl_a = readl_relaxed(pmu->base + PMLCA(counter));
+	event = FIELD_GET(CONFIG_EVENT_MASK, config);
 
 	if (enable) {
 		ctrl_a |= PMLCA_FC;
@@ -352,7 +357,7 @@ static void ddr_perf_counter_local_config(struct ddr_pmu *pmu, int config,
 		ctrl_a &= ~PMLCA_FC;
 		ctrl_a |= PMLCA_CE;
 		ctrl_a &= ~FIELD_PREP(PMLCA_EVENT, 0x7F);
-		ctrl_a |= FIELD_PREP(PMLCA_EVENT, (config & 0x000000FF));
+		ctrl_a |= FIELD_PREP(PMLCA_EVENT, event);
 		writel(ctrl_a, pmu->base + PMLCA(counter));
 	} else {
 		/* Freeze counter. */
@@ -366,8 +371,8 @@ static void ddr_perf_monitor_config(struct ddr_pmu *pmu, int cfg, int cfg1, int
 	u32 pmcfg1, pmcfg2;
 	int event, counter;
 
-	event = cfg & 0x000000FF;
-	counter = (cfg & 0x0000FF00) >> 8;
+	event = FIELD_GET(CONFIG_EVENT_MASK, cfg);
+	counter = FIELD_GET(CONFIG_COUNTER_MASK, cfg);
 
 	pmcfg1 = readl_relaxed(pmu->base + PMCFG1);
 
@@ -469,7 +474,7 @@ static int ddr_perf_event_add(struct perf_event *event, int flags)
 	int cfg2 = event->attr.config2;
 	int counter;
 
-	counter = (cfg & 0x0000FF00) >> 8;
+	counter = FIELD_GET(CONFIG_COUNTER_MASK, cfg);
 
 	pmu->events[counter] = event;
 	pmu->active_events++;