ar71xx: add detailed interrupt statistics for the ag71xx driver

SVN-Revision: 19054

target/linux/ar71xx/files/drivers/net/ag71xx/ag71xx.h

@@ -109,8 +109,20 @@ struct ag71xx_mdio {
 	struct ag71xx_mdio_platform_data *pdata;
 };
 
+struct ag71xx_int_stats {
+	unsigned long		rx_pr;
+	unsigned long		rx_be;
+	unsigned long		rx_of;
+	unsigned long		tx_ps;
+	unsigned long		tx_be;
+	unsigned long		tx_ur;
+	unsigned long		total;
+};
+
 struct ag71xx_debug {
 	struct dentry		*debugfs_dir;
+	struct dentry		*debugfs_int_stats;
+	struct ag71xx_int_stats int_stats;
 };
 
 struct ag71xx {
@@ -463,11 +475,14 @@ int ag71xx_debugfs_root_init(void);
 void ag71xx_debugfs_root_exit(void);
 int ag71xx_debugfs_init(struct ag71xx *ag);
 void ag71xx_debugfs_exit(struct ag71xx *ag);
+void ag71xx_debugfs_update_int_stats(struct ag71xx *ag, u32 status);
 #else
 static inline int ag71xx_debugfs_root_init(void) { return 0; }
 static inline void ag71xx_debugfs_root_exit(void) {}
 static inline int ag71xx_debugfs_init(struct ag71xx *ag) { return 0; }
 static inline void ag71xx_debugfs_exit(struct ag71xx *ag) {}
+static inline void ag71xx_debug_update_int_stats(struct ag71xx *ag,
+						 u32 status) {}
 #endif /* CONFIG_AG71XX_DEBUG_FS */
 
 #endif /* _AG71XX_H */

target/linux/ar71xx/files/drivers/net/ag71xx/ag71xx_debugfs.c

@@ -17,26 +17,63 @@
 
 static struct dentry *ag71xx_debugfs_root;
 
-int ag71xx_debugfs_root_init(void)
+static int ag71xx_debugfs_generic_open(struct inode *inode, struct file *file)
 {
-	if (ag71xx_debugfs_root)
-		return -EBUSY;
-
-	ag71xx_debugfs_root = debugfs_create_dir(KBUILD_MODNAME, NULL);
-	if (!ag71xx_debugfs_root)
-		return -ENOENT;
-
+	file->private_data = inode->i_private;
 	return 0;
 }
 
-void ag71xx_debugfs_root_exit(void)
+void ag71xx_debugfs_update_int_stats(struct ag71xx *ag, u32 status)
 {
-	debugfs_remove(ag71xx_debugfs_root);
-	ag71xx_debugfs_root = NULL;
+	if (status)
+		ag->debug.int_stats.total++;
+	if (status & AG71XX_INT_TX_PS)
+		ag->debug.int_stats.tx_ps++;
+	if (status & AG71XX_INT_TX_UR)
+		ag->debug.int_stats.tx_ur++;
+	if (status & AG71XX_INT_TX_BE)
+		ag->debug.int_stats.tx_be++;
+	if (status & AG71XX_INT_RX_PR)
+		ag->debug.int_stats.rx_pr++;
+	if (status & AG71XX_INT_RX_OF)
+		ag->debug.int_stats.rx_of++;
+	if (status & AG71XX_INT_RX_BE)
+		ag->debug.int_stats.rx_be++;
 }
 
+static ssize_t read_file_int_stats(struct file *file, char __user *user_buf,
+				   size_t count, loff_t *ppos)
+{
+#define PR_INT_STAT(_label, _field) 					\
+	len += snprintf(buf + len, sizeof(buf) - len, 			\
+		"%20s: %10lu\n", _label, ag->debug.int_stats._field);
+
+	struct ag71xx *ag = file->private_data;
+	char buf[256];
+	unsigned int len = 0;
+
+	PR_INT_STAT("TX Packet Sent", tx_ps);
+	PR_INT_STAT("TX Underrun", tx_ur);
+	PR_INT_STAT("TX Bus Error", tx_be);
+	PR_INT_STAT("RX Packet Received", rx_pr);
+	PR_INT_STAT("RX Overflow", rx_of);
+	PR_INT_STAT("RX Bus Error", rx_be);
+	len += snprintf(buf + len, sizeof(buf) - len, "\n");
+	PR_INT_STAT("Total", total);
+
+	return simple_read_from_buffer(user_buf, count, ppos, buf, len);
+#undef PR_INT_STAT
+}
+
+static const struct file_operations ag71xx_fops_int_stats = {
+	.open	= ag71xx_debugfs_generic_open,
+	.read	= read_file_int_stats,
+	.owner	= THIS_MODULE
+};
+
 void ag71xx_debugfs_exit(struct ag71xx *ag)
 {
+	debugfs_remove(ag->debug.debugfs_int_stats);
 	debugfs_remove(ag->debug.debugfs_dir);
 }
 
@@ -47,9 +84,36 @@ int ag71xx_debugfs_init(struct ag71xx *ag)
 	if (!ag->debug.debugfs_dir)
 		goto err;
 
+	ag->debug.debugfs_int_stats =
+			debugfs_create_file("int_stats",
+					    S_IRUGO,
+					    ag->debug.debugfs_dir,
+					    ag,
+					    &ag71xx_fops_int_stats);
+	if (!ag->debug.debugfs_int_stats)
+		goto err;
+
 	return 0;
 
  err:
 	ag71xx_debugfs_exit(ag);
 	return -ENOMEM;
 }
+
+int ag71xx_debugfs_root_init(void)
+{
+	if (ag71xx_debugfs_root)
+		return -EBUSY;
+
+	ag71xx_debugfs_root = debugfs_create_dir(KBUILD_MODNAME, NULL);
+	if (!ag71xx_debugfs_root)
+		return -ENOENT;
+
+	return 0;
+}
+
+void ag71xx_debugfs_root_exit(void)
+{
+	debugfs_remove(ag71xx_debugfs_root);
+	ag71xx_debugfs_root = NULL;
+}

target/linux/ar71xx/files/drivers/net/ag71xx/ag71xx_main.c

@@ -795,6 +795,8 @@ static irqreturn_t ag71xx_interrupt(int irq, void *dev_id)
 		napi_schedule(&ag->napi);
 	}
 
+	ag71xx_debugfs_update_int_stats(ag, status);
+
 	return IRQ_HANDLED;
 }