coresight: Use enum type for cs_mode wherever possible

mode is stored as a local_t, but it is also passed around a lot as a
plain u32, so use the correct type wherever local_t isn't currently
used. This helps a little bit with readability.

Reviewed-by: Mike Leach <mike.leach@linaro.org>
Signed-off-by: James Clark <james.clark@arm.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Link: https://lore.kernel.org/r/20230425143542.2305069-3-james.clark@arm.com

drivers/hwtracing/coresight/coresight-core.c

@@ -308,7 +308,7 @@ void coresight_set_assoc_ectdev_mutex(struct coresight_device *csdev,
 EXPORT_SYMBOL_GPL(coresight_set_assoc_ectdev_mutex);
 
 static int coresight_enable_sink(struct coresight_device *csdev,
-				 u32 mode, void *data)
+				 enum cs_mode mode, void *data)
 {
 	int ret;
 
@@ -416,7 +416,8 @@ static void coresight_disable_link(struct coresight_device *csdev,
 	csdev->enable = false;
 }
 
-static int coresight_enable_source(struct coresight_device *csdev, u32 mode)
+static int coresight_enable_source(struct coresight_device *csdev,
+				   enum cs_mode mode)
 {
 	int ret;
 
@@ -516,7 +517,7 @@ void coresight_disable_path(struct list_head *path)
 }
 EXPORT_SYMBOL_GPL(coresight_disable_path);
 
-int coresight_enable_path(struct list_head *path, u32 mode, void *sink_data)
+int coresight_enable_path(struct list_head *path, enum cs_mode mode, void *sink_data)
 {
 
 	int ret = 0;

drivers/hwtracing/coresight/coresight-etb10.c

@@ -225,7 +225,8 @@ out:
 	return ret;
 }
 
-static int etb_enable(struct coresight_device *csdev, u32 mode, void *data)
+static int etb_enable(struct coresight_device *csdev, enum cs_mode mode,
+		      void *data)
 {
 	int ret;
 

drivers/hwtracing/coresight/coresight-etm3x-core.c

@@ -552,8 +552,8 @@ unlock_enable_sysfs:
 	return ret;
 }
 
-static int etm_enable(struct coresight_device *csdev,
-		      struct perf_event *event, u32 mode)
+static int etm_enable(struct coresight_device *csdev, struct perf_event *event,
+		      enum cs_mode mode)
 {
 	int ret;
 	u32 val;
@@ -671,7 +671,7 @@ static void etm_disable_sysfs(struct coresight_device *csdev)
 static void etm_disable(struct coresight_device *csdev,
 			struct perf_event *event)
 {
-	u32 mode;
+	enum cs_mode mode;
 	struct etm_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
 
 	/*

drivers/hwtracing/coresight/coresight-etm4x-core.c

@@ -822,8 +822,8 @@ unlock_sysfs_enable:
 	return ret;
 }
 
-static int etm4_enable(struct coresight_device *csdev,
-		       struct perf_event *event, u32 mode)
+static int etm4_enable(struct coresight_device *csdev, struct perf_event *event,
+		       enum cs_mode mode)
 {
 	int ret;
 	u32 val;
@@ -989,7 +989,7 @@ static void etm4_disable_sysfs(struct coresight_device *csdev)
 static void etm4_disable(struct coresight_device *csdev,
 			 struct perf_event *event)
 {
-	u32 mode;
+	enum cs_mode mode;
 	struct etmv4_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
 
 	/*

drivers/hwtracing/coresight/coresight-priv.h

@@ -82,12 +82,6 @@ enum etm_addr_type {
 	ETM_ADDR_TYPE_STOP,
 };
 
-enum cs_mode {
-	CS_MODE_DISABLED,
-	CS_MODE_SYSFS,
-	CS_MODE_PERF,
-};
-
 /**
  * struct cs_buffer - keep track of a recording session' specifics
  * @cur:	index of the current buffer
@@ -133,7 +127,8 @@ static inline void CS_UNLOCK(void __iomem *addr)
 }
 
 void coresight_disable_path(struct list_head *path);
-int coresight_enable_path(struct list_head *path, u32 mode, void *sink_data);
+int coresight_enable_path(struct list_head *path, enum cs_mode mode,
+			  void *sink_data);
 struct coresight_device *coresight_get_sink(struct list_head *path);
 struct coresight_device *
 coresight_get_enabled_sink(struct coresight_device *source);

drivers/hwtracing/coresight/coresight-stm.c

@@ -119,7 +119,7 @@ DEFINE_CORESIGHT_DEVLIST(stm_devs, "stm");
  * @spinlock:		only one at a time pls.
  * @chs:		the channels accociated to this STM.
  * @stm:		structure associated to the generic STM interface.
- * @mode:		this tracer's mode, i.e sysFS, or disabled.
+ * @mode:		this tracer's mode (enum cs_mode), i.e sysFS, or disabled.
  * @traceid:		value of the current ID for this component.
  * @write_bytes:	Maximus bytes this STM can write at a time.
  * @stmsper:		settings for register STMSPER.
@@ -192,8 +192,8 @@ static void stm_enable_hw(struct stm_drvdata *drvdata)
 	CS_LOCK(drvdata->base);
 }
 
-static int stm_enable(struct coresight_device *csdev,
-		      struct perf_event *event, u32 mode)
+static int stm_enable(struct coresight_device *csdev, struct perf_event *event,
+		      enum cs_mode mode)
 {
 	u32 val;
 	struct stm_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);

drivers/hwtracing/coresight/coresight-tmc-etf.c

@@ -302,7 +302,7 @@ static int tmc_enable_etf_sink_perf(struct coresight_device *csdev, void *data)
 }
 
 static int tmc_enable_etf_sink(struct coresight_device *csdev,
-			       u32 mode, void *data)
+			       enum cs_mode mode, void *data)
 {
 	int ret;
 

drivers/hwtracing/coresight/coresight-tmc-etr.c

@@ -1666,17 +1666,16 @@ unlock_out:
 }
 
 static int tmc_enable_etr_sink(struct coresight_device *csdev,
-			       u32 mode, void *data)
+			       enum cs_mode mode, void *data)
 {
 	switch (mode) {
 	case CS_MODE_SYSFS:
 		return tmc_enable_etr_sink_sysfs(csdev);
 	case CS_MODE_PERF:
 		return tmc_enable_etr_sink_perf(csdev, data);
+	default:
+		return -EINVAL;
 	}
-
-	/* We shouldn't be here */
-	return -EINVAL;
 }
 
 static int tmc_disable_etr_sink(struct coresight_device *csdev)

drivers/hwtracing/coresight/coresight-tpdm.c

@@ -42,8 +42,8 @@ static void __tpdm_enable(struct tpdm_drvdata *drvdata)
 	CS_LOCK(drvdata->base);
 }
 
-static int tpdm_enable(struct coresight_device *csdev,
-		       struct perf_event *event, u32 mode)
+static int tpdm_enable(struct coresight_device *csdev, struct perf_event *event,
+		       enum cs_mode mode)
 {
 	struct tpdm_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
 

drivers/hwtracing/coresight/coresight-tpiu.c

@@ -69,7 +69,8 @@ static void tpiu_enable_hw(struct csdev_access *csa)
 	CS_LOCK(csa->base);
 }
 
-static int tpiu_enable(struct coresight_device *csdev, u32 mode, void *__unused)
+static int tpiu_enable(struct coresight_device *csdev, enum cs_mode mode,
+		       void *__unused)
 {
 	tpiu_enable_hw(&csdev->access);
 	atomic_inc(csdev->refcnt);

drivers/hwtracing/coresight/coresight-trbe.c

@@ -1005,7 +1005,8 @@ err:
 	return ret;
 }
 
-static int arm_trbe_enable(struct coresight_device *csdev, u32 mode, void *data)
+static int arm_trbe_enable(struct coresight_device *csdev, enum cs_mode mode,
+			   void *data)
 {
 	struct trbe_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
 	struct trbe_cpudata *cpudata = dev_get_drvdata(&csdev->dev);

drivers/hwtracing/coresight/ultrasoc-smb.c

@@ -256,7 +256,8 @@ static int smb_enable_perf(struct coresight_device *csdev, void *data)
 	return 0;
 }
 
-static int smb_enable(struct coresight_device *csdev, u32 mode, void *data)
+static int smb_enable(struct coresight_device *csdev, enum cs_mode mode,
+		      void *data)
 {
 	struct smb_drv_data *drvdata = dev_get_drvdata(csdev->dev.parent);
 	int ret = 0;

drivers/hwtracing/coresight/ultrasoc-smb.h

@@ -119,7 +119,7 @@ struct smb_drv_data {
 	struct mutex mutex;
 	bool reading;
 	pid_t pid;
-	u32 mode;
+	enum cs_mode mode;
 };
 
 #endif

include/linux/coresight.h

@@ -272,6 +272,12 @@ static struct coresight_dev_list (var) = {				\
 
 #define to_coresight_device(d) container_of(d, struct coresight_device, dev)
 
+enum cs_mode {
+	CS_MODE_DISABLED,
+	CS_MODE_SYSFS,
+	CS_MODE_PERF,
+};
+
 #define source_ops(csdev)	csdev->ops->source_ops
 #define sink_ops(csdev)		csdev->ops->sink_ops
 #define link_ops(csdev)		csdev->ops->link_ops
@@ -288,7 +294,8 @@ static struct coresight_dev_list (var) = {				\
  * @update_buffer:	update buffer pointers after a trace session.
  */
 struct coresight_ops_sink {
-	int (*enable)(struct coresight_device *csdev, u32 mode, void *data);
+	int (*enable)(struct coresight_device *csdev, enum cs_mode mode,
+		      void *data);
 	int (*disable)(struct coresight_device *csdev);
 	void *(*alloc_buffer)(struct coresight_device *csdev,
 			      struct perf_event *event, void **pages,
@@ -320,8 +327,8 @@ struct coresight_ops_link {
  */
 struct coresight_ops_source {
 	int (*cpu_id)(struct coresight_device *csdev);
-	int (*enable)(struct coresight_device *csdev,
-		      struct perf_event *event,  u32 mode);
+	int (*enable)(struct coresight_device *csdev, struct perf_event *event,
+		      enum cs_mode mode);
 	void (*disable)(struct coresight_device *csdev,
 			struct perf_event *event);
 };