b43: Add optional verbose runtime statistics

This adds support for verbose runtime statistics.
It defaults to off and must be enabled in debugfs, if desired.
The first measurement may be incorrect, because statistics are not cleared
after they got enabled through debugfs.

Signed-off-by: Michael Buesch <mb@bu3sch.de>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 34 insertions, 0 deletions

diff --git a/drivers/net/wireless/b43/main.c b/drivers/net/wireless/b43/main.c
index 7d22dadfd890..6468bbeba687 100644
--- a/drivers/net/wireless/b43/main.c
+++ b/drivers/net/wireless/b43/main.c
@@ -1830,6 +1830,16 @@ static void b43_do_interrupt_thread(struct b43_wldev *dev)
 
 	/* Re-enable interrupts on the device by restoring the current interrupt mask. */
 	b43_write32(dev, B43_MMIO_GEN_IRQ_MASK, dev->irq_mask);
+
+#if B43_DEBUG
+	if (b43_debug(dev, B43_DBG_VERBOSESTATS)) {
+		dev->irq_count++;
+		for (i = 0; i < ARRAY_SIZE(dev->irq_bit_count); i++) {
+			if (reason & (1 << i))
+				dev->irq_bit_count[i]++;
+		}
+	}
+#endif
 }
 
 /* Interrupt thread handler. Handles device interrupts in thread context. */
@@ -2893,6 +2903,27 @@ static void b43_periodic_every15sec(struct b43_wldev *dev)
 
 	atomic_set(&phy->txerr_cnt, B43_PHY_TX_BADNESS_LIMIT);
 	wmb();
+
+#if B43_DEBUG
+	if (b43_debug(dev, B43_DBG_VERBOSESTATS)) {
+		unsigned int i;
+
+		b43dbg(dev->wl, "Stats: %7u IRQs/sec, %7u TX/sec, %7u RX/sec\n",
+		       dev->irq_count / 15,
+		       dev->tx_count / 15,
+		       dev->rx_count / 15);
+		dev->irq_count = 0;
+		dev->tx_count = 0;
+		dev->rx_count = 0;
+		for (i = 0; i < ARRAY_SIZE(dev->irq_bit_count); i++) {
+			if (dev->irq_bit_count[i]) {
+				b43dbg(dev->wl, "Stats: %7u IRQ-%02u/sec (0x%08X)\n",
+				       dev->irq_bit_count[i] / 15, i, (1 << i));
+				dev->irq_bit_count[i] = 0;
+			}
+		}
+	}
+#endif
 }
 
 static void do_periodic_work(struct b43_wldev *dev)
@@ -3092,6 +3123,9 @@ static void b43_tx_work(struct work_struct *work)
 			dev_kfree_skb(skb); /* Drop it */
 	}
 
+#if B43_DEBUG
+	dev->tx_count++;
+#endif
 	mutex_unlock(&wl->mutex);
 }