ramips: raeth: show interrupt statistics in debugfs

SVN-Revision: 30681

target/linux/ramips/files/drivers/net/ethernet/ramips/ramips_debugfs.c

@@ -9,12 +9,87 @@
  */
 
 #include <linux/debugfs.h>
+#include <linux/module.h>
 #include <linux/phy.h>
 
 #include "ramips_eth.h"
 
 static struct dentry *raeth_debugfs_root;
 
+static int raeth_debugfs_generic_open(struct inode *inode, struct file *file)
+{
+	file->private_data = inode->i_private;
+	return 0;
+}
+
+void raeth_debugfs_update_int_stats(struct raeth_priv *re, u32 status)
+{
+	re->debug.int_stats.total += !!status;
+
+	re->debug.int_stats.rx_delayed += !!(status & RAMIPS_RX_DLY_INT);
+	re->debug.int_stats.rx_done0 += !!(status & RAMIPS_RX_DONE_INT0);
+	re->debug.int_stats.rx_coherent += !!(status & RAMIPS_RX_COHERENT);
+
+	re->debug.int_stats.tx_delayed += !!(status & RAMIPS_TX_DLY_INT);
+	re->debug.int_stats.tx_done0 += !!(status & RAMIPS_TX_DONE_INT0);
+	re->debug.int_stats.tx_done1 += !!(status & RAMIPS_TX_DONE_INT1);
+	re->debug.int_stats.tx_done2 += !!(status & RAMIPS_TX_DONE_INT2);
+	re->debug.int_stats.tx_done3 += !!(status & RAMIPS_TX_DONE_INT3);
+	re->debug.int_stats.tx_coherent += !!(status & RAMIPS_TX_COHERENT);
+
+	re->debug.int_stats.pse_fq_empty += !!(status & RAMIPS_PSE_FQ_EMPTY);
+	re->debug.int_stats.pse_p0_fc += !!(status & RAMIPS_PSE_P0_FC);
+	re->debug.int_stats.pse_p1_fc += !!(status & RAMIPS_PSE_P1_FC);
+	re->debug.int_stats.pse_p2_fc += !!(status & RAMIPS_PSE_P2_FC);
+	re->debug.int_stats.pse_buf_drop += !!(status & RAMIPS_PSE_BUF_DROP);
+}
+
+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,			\
+		"%-18s: %10lu\n", _label, re->debug.int_stats._field);
+
+	struct raeth_priv *re = file->private_data;
+	char buf[512];
+	unsigned int len = 0;
+	unsigned long flags;
+
+	spin_lock_irqsave(&re->page_lock, flags);
+
+	PR_INT_STAT("RX Delayed", rx_delayed);
+	PR_INT_STAT("RX Done 0", rx_done0);
+	PR_INT_STAT("RX Coherent", rx_coherent);
+
+	PR_INT_STAT("TX Delayed", tx_delayed);
+	PR_INT_STAT("TX Done 0", tx_done0);
+	PR_INT_STAT("TX Done 1", tx_done1);
+	PR_INT_STAT("TX Done 2", tx_done2);
+	PR_INT_STAT("TX Done 3", tx_done3);
+	PR_INT_STAT("TX Coherent", tx_coherent);
+
+	PR_INT_STAT("PSE FQ empty", pse_fq_empty);
+	PR_INT_STAT("CDMA Flow control", pse_p0_fc);
+	PR_INT_STAT("GDMA1 Flow control", pse_p1_fc);
+	PR_INT_STAT("GDMA2 Flow control", pse_p2_fc);
+	PR_INT_STAT("PSE discard", pse_buf_drop);
+
+	len += snprintf(buf + len, sizeof(buf) - len, "\n");
+	PR_INT_STAT("Total", total);
+
+	spin_unlock_irqrestore(&re->page_lock, flags);
+
+	return simple_read_from_buffer(user_buf, count, ppos, buf, len);
+#undef PR_INT_STAT
+}
+
+static const struct file_operations raeth_fops_int_stats = {
+	.open	= raeth_debugfs_generic_open,
+	.read	= read_file_int_stats,
+	.owner	= THIS_MODULE
+};
+
 void raeth_debugfs_exit(struct raeth_priv *re)
 {
 	debugfs_remove_recursive(re->debug.debugfs_dir);
@@ -27,6 +102,9 @@ int raeth_debugfs_init(struct raeth_priv *re)
 	if (!re->debug.debugfs_dir)
 		return -ENOMEM;
 
+	debugfs_create_file("int_stats", S_IRUGO, re->debug.debugfs_dir,
+			    re, &raeth_fops_int_stats);
+
 	return 0;
 }
 

target/linux/ramips/files/drivers/net/ethernet/ramips/ramips_eth.h

@@ -213,8 +213,30 @@ struct ramips_tx_dma {
 	unsigned int txd4;
 } __packed __aligned(4);
 
+struct raeth_int_stats {
+	unsigned long		rx_delayed;
+	unsigned long		tx_delayed;
+	unsigned long		rx_done0;
+	unsigned long		tx_done0;
+	unsigned long		tx_done1;
+	unsigned long		tx_done2;
+	unsigned long		tx_done3;
+	unsigned long		rx_coherent;
+	unsigned long		tx_coherent;
+
+	unsigned long		pse_fq_empty;
+	unsigned long		pse_p0_fc;
+	unsigned long		pse_p1_fc;
+	unsigned long		pse_p2_fc;
+	unsigned long		pse_buf_drop;
+
+	unsigned long		total;
+};
+
 struct raeth_debug {
 	struct dentry		*debugfs_dir;
+
+	struct raeth_int_stats	int_stats;
 };
 
 struct raeth_priv
@@ -258,11 +280,14 @@ int raeth_debugfs_root_init(void);
 void raeth_debugfs_root_exit(void);
 int raeth_debugfs_init(struct raeth_priv *re);
 void raeth_debugfs_exit(struct raeth_priv *re);
+void raeth_debugfs_update_int_stats(struct raeth_priv *re, u32 status);
 #else
 static inline int raeth_debugfs_root_init(void) { return 0; }
 static inline void raeth_debugfs_root_exit(void) {}
 static inline int raeth_debugfs_init(struct raeth_priv *re) { return 0; }
 static inline void raeth_debugfs_exit(struct raeth_priv *re) {}
+static inline void raeth_debugfs_update_int_stats(struct raeth_priv *re,
+						  u32 status) {}
 #endif /* CONFIG_NET_RAMIPS_DEBUG_FS */
 
 #endif /* RAMIPS_ETH_H */

target/linux/ramips/files/drivers/net/ethernet/ramips/ramips_main.c

@@ -769,6 +769,8 @@ ramips_eth_irq(int irq, void *dev)
 		tasklet_schedule(&re->tx_housekeeping_tasklet);
 	}
 
+	raeth_debugfs_update_int_stats(re, fe_int);
+
 	return IRQ_HANDLED;
 }