[RFC 18/29] dma-buf/fence: create default .fence_value_str() and .timeline_value_str()

[Gustavo Padovan]

From: Gustavo Padovan <gustavo.padovan@xxxxxxxxxxxxxxx>

Provide simple default functions to help users retrieve the values of the
fence and the timeline.

Signed-off-by: Gustavo Padovan <gustavo.padovan@xxxxxxxxxxxxxxx>
---
 drivers/dma-buf/fence.c              | 31 +++++++++++++++++++++++++++++++
 drivers/staging/android/sw_sync.c    | 18 ------------------
 drivers/staging/android/sync.c       | 30 ++----------------------------
 drivers/staging/android/sync_debug.c | 11 +----------
 include/linux/fence.h                | 10 ++--------
 include/trace/events/fence.h         | 12 +++---------
 6 files changed, 39 insertions(+), 73 deletions(-)

diff --git a/drivers/dma-buf/fence.c b/drivers/dma-buf/fence.c
index 786c987..9fdeae8 100644
--- a/drivers/dma-buf/fence.c
+++ b/drivers/dma-buf/fence.c
@@ -620,6 +620,37 @@ void fence_default_release(struct fence *fence)
 }
 EXPORT_SYMBOL(fence_default_release);
 
+/**
+ * fence_default_value_str - default .fence_value_str fence ops
+ * @fence:	[in]	the fence to get the value from
+ * @str:	[out]	the string pointer to write the value
+ * @size:	[in]	the size of the allocated string
+ *
+ * This functions returns a string containing the value of the fence.
+ */
+void fence_default_value_str(struct fence *fence, char *str, int size)
+{
+	snprintf(str, size, "%d", fence->seqno);
+}
+EXPORT_SYMBOL(fence_default_value_str);
+
+/**
+ * fence_default_timeline_value_str - default .timeline_value_str fence ops
+ * @fence:	[in]	the timeline child fence
+ * @str:	[out]	the string pointer to write the value
+ * @size:	[in]	the size of the allocated string
+ *
+ * This functions returns a string containing the value of the last signaled
+ * fence in this timeline.
+ */
+void fence_default_timeline_value_str(struct fence *fence, char *str, int size)
+{
+	struct fence_timeline *timeline = fence_parent(fence);
+
+	snprintf(str, size, "%d", timeline->value);
+}
+EXPORT_SYMBOL(fence_default_timeline_value_str);
+
 static bool
 fence_test_signaled_any(struct fence **fences, uint32_t count)
 {
diff --git a/drivers/staging/android/sw_sync.c b/drivers/staging/android/sw_sync.c
index bed6801..cfd7a18 100644
--- a/drivers/staging/android/sw_sync.c
+++ b/drivers/staging/android/sw_sync.c
@@ -51,26 +51,8 @@ static int sw_sync_fill_driver_data(struct fence *fence,
 	return sizeof(pt->value);
 }
 
-static void sw_sync_timeline_value_str(struct fence_timeline *fence_timeline,
-				       char *str, int size)
-{
-	struct sw_sync_timeline *timeline =
-		(struct sw_sync_timeline *)fence_timeline;
-	snprintf(str, size, "%d", timeline->value);
-}
-
-static void sw_sync_fence_value_str(struct fence *fence,
-				 char *str, int size)
-{
-	struct sw_sync_pt *pt = (struct sw_sync_pt *)fence;
-
-	snprintf(str, size, "%d", pt->value);
-}
-
 static struct fence_timeline_ops sw_sync_timeline_ops = {
 	.fill_driver_data = sw_sync_fill_driver_data,
-	.timeline_value_str = sw_sync_timeline_value_str,
-	.fence_value_str = sw_sync_fence_value_str,
 };
 
 struct sw_sync_timeline *sw_sync_timeline_create(const char *name)
diff --git a/drivers/staging/android/sync.c b/drivers/staging/android/sync.c
index 8216635..147a494 100644
--- a/drivers/staging/android/sync.c
+++ b/drivers/staging/android/sync.c
@@ -331,32 +331,6 @@ static int sync_fence_fill_driver_data(struct fence *fence,
 	return parent->ops->fill_driver_data(fence, data, size);
 }
 
-static void sync_fence_value_str(struct fence *fence,
-				    char *str, int size)
-{
-	struct fence_timeline *parent = fence_parent(fence);
-
-	if (!parent->ops->fence_value_str) {
-		if (size)
-			*str = 0;
-		return;
-	}
-	parent->ops->fence_value_str(fence, str, size);
-}
-
-static void sync_fence_timeline_value_str(struct fence *fence,
-					     char *str, int size)
-{
-	struct fence_timeline *parent = fence_parent(fence);
-
-	if (!parent->ops->timeline_value_str) {
-		if (size)
-			*str = 0;
-		return;
-	}
-	parent->ops->timeline_value_str(parent, str, size);
-}
-
 static const struct fence_ops sync_fence_ops = {
 	.get_driver_name = fence_default_get_driver_name,
 	.get_timeline_name = fence_default_get_timeline_name,
@@ -365,8 +339,8 @@ static const struct fence_ops sync_fence_ops = {
 	.wait = fence_default_wait,
 	.release = fence_default_release,
 	.fill_driver_data = sync_fence_fill_driver_data,
-	.fence_value_str = sync_fence_value_str,
-	.timeline_value_str = sync_fence_timeline_value_str,
+	.fence_value_str = fence_default_value_str,
+	.timeline_value_str = fence_default_timeline_value_str,
 };
 
 static void sync_fence_free(struct kref *kref)
diff --git a/drivers/staging/android/sync_debug.c b/drivers/staging/android/sync_debug.c
index db618ca..89b334c 100644
--- a/drivers/staging/android/sync_debug.c
+++ b/drivers/staging/android/sync_debug.c
@@ -133,16 +133,7 @@ static void sync_print_obj(struct seq_file *s, struct fence_timeline *obj)
 	struct list_head *pos;
 	unsigned long flags;
 
-	seq_printf(s, "%s %s", obj->name, obj->drv_name);
-
-	if (obj->ops->timeline_value_str) {
-		char value[64];
-
-		obj->ops->timeline_value_str(obj, value, sizeof(value));
-		seq_printf(s, ": %s", value);
-	}
-
-	seq_puts(s, "\n");
+	seq_printf(s, "%s %s: %d\n", obj->name, obj->drv_name, obj->value);
 
 	spin_lock_irqsave(&obj->lock, flags);
 	list_for_each(pos, &obj->child_list_head) {
diff --git a/include/linux/fence.h b/include/linux/fence.h
index e71545e..5371beb 100644
--- a/include/linux/fence.h
+++ b/include/linux/fence.h
@@ -40,19 +40,11 @@ struct fence_cb;
  *			  should return an error if there is not enough room
  *			  as specified by size.  This information is returned
  *			  to userspace by SYNC_IOC_FENCE_INFO.
- * @timeline_value_str: fill str with the value of the sync_timeline's counter
  * @pt_value_str:	fill str with the value of the sync_pt
  */
 struct fence_timeline_ops {
 	/* optional */
 	int (*fill_driver_data)(struct fence *fence, void *data, int size);
-
-	/* optional */
-	void (*timeline_value_str)(struct fence_timeline *timeline, char *str,
-				   int size);
-
-	/* optional */
-	void (*fence_value_str)(struct fence *fence, char *str, int size);
 };
 
 /**
@@ -293,6 +285,8 @@ bool fence_default_signaled(struct fence *fence);
 bool fence_default_enable_signaling(struct fence *fence);
 signed long fence_default_wait(struct fence *fence, bool intr, signed long timeout);
 void fence_default_release(struct fence *fence);
+void fence_default_value_str(struct fence *fence, char *str, int size);
+void fence_default_timeline_value_str(struct fence *fence, char *str, int size);
 int fence_add_callback(struct fence *fence, struct fence_cb *cb,
 		       fence_func_t func);
 bool fence_remove_callback(struct fence *fence, struct fence_cb *cb);
diff --git a/include/trace/events/fence.h b/include/trace/events/fence.h
index c4d01de..e1ca808 100644
--- a/include/trace/events/fence.h
+++ b/include/trace/events/fence.h
@@ -55,21 +55,15 @@ TRACE_EVENT(fence_timeline,
 
 	TP_STRUCT__entry(
 			__string(name, timeline->name)
-			__array(char, value, 32)
+			__field(unsigned int, value)
 	),
 
 	TP_fast_assign(
 			__assign_str(name, timeline->name);
-			if (timeline->ops->timeline_value_str) {
-				timeline->ops->timeline_value_str(timeline,
-							__entry->value,
-							sizeof(__entry->value));
-			} else {
-				__entry->value[0] = '\0';
-			}
+			__entry->value = timeline->value;
 	),
 
-	TP_printk("name=%s value=%s", __get_str(name), __entry->value)
+	TP_printk("name=%s value=%u", __get_str(name), __entry->value)
 );
 
 DECLARE_EVENT_CLASS(fence,
-- 
2.5.0