Add some debugging code (under ARGE_DEBUG) that counts each interrupt source.

This should make it easier to track down interrupt storms from arge.

Tested:

* AP135 (QCA955x) SoC - defaults to ARGE_DEBUG enabled
* Carambola2 (AR9331 SoC) - defaults to ARGE_DEBUG disabled

2 files changed, 37 insertions, 0 deletions

diff --git a/sys/mips/atheros/if_arge.c b/sys/mips/atheros/if_arge.c
index 06a5be3..f93b7bd 100644
--- a/sys/mips/atheros/if_arge.c
+++ b/sys/mips/atheros/if_arge.c
@@ -277,6 +277,28 @@ arge_probe(device_t dev)
 	return (BUS_PROBE_NOWILDCARD);
 }
 
+#ifdef	ARGE_DEBUG
+static void
+arge_attach_intr_sysctl(device_t dev, struct sysctl_oid_list *parent)
+{
+	struct arge_softc *sc = device_get_softc(dev);
+	struct sysctl_ctx_list *ctx = device_get_sysctl_ctx(dev);
+	struct sysctl_oid *tree = device_get_sysctl_tree(dev);
+	struct sysctl_oid_list *child = SYSCTL_CHILDREN(tree);
+	char sn[8];
+	int i;
+
+	tree = SYSCTL_ADD_NODE(ctx, parent, OID_AUTO, "intr",
+	    CTLFLAG_RD, NULL, "Interrupt statistics");
+	child = SYSCTL_CHILDREN(tree);
+	for (i = 0; i < 32; i++) {
+		snprintf(sn, sizeof(sn), "%d", i);
+		SYSCTL_ADD_UINT(ctx, child, OID_AUTO, sn, CTLFLAG_RD,
+		    &sc->intr_stats.count[i], 0, "");
+	}
+}
+#endif
+
 static void
 arge_attach_sysctl(device_t dev)
 {
@@ -288,6 +310,7 @@ arge_attach_sysctl(device_t dev)
 	SYSCTL_ADD_INT(ctx, SYSCTL_CHILDREN(tree), OID_AUTO,
 		"debug", CTLFLAG_RW, &sc->arge_debug, 0,
 		"arge interface debugging flags");
+	arge_attach_intr_sysctl(dev, SYSCTL_CHILDREN(tree));
 #endif
 
 	SYSCTL_ADD_UINT(ctx, SYSCTL_CHILDREN(tree), OID_AUTO,
@@ -2440,6 +2463,9 @@ arge_intr(void *arg)
 	struct arge_softc	*sc = arg;
 	uint32_t		status;
 	struct ifnet		*ifp = sc->arge_ifp;
+#ifdef	ARGE_DEBUG
+	int i;
+#endif
 
 	status = ARGE_READ(sc, AR71XX_DMA_INTR_STATUS);
 	status |= sc->arge_intr_status;
@@ -2456,6 +2482,14 @@ arge_intr(void *arg)
 		return;
 	}
 
+#ifdef	ARGE_DEBUG
+	for (i = 0; i < 32; i++) {
+		if (status & (1 << i)) {
+			sc->intr_stats.count[1 << i]++;
+		}
+	}
+#endif
+
 	if (status & DMA_INTR_RX_BUS_ERROR) {
 		ARGE_WRITE(sc, AR71XX_DMA_RX_STATUS, DMA_RX_STATUS_BUS_ERROR);
 		device_printf(sc->arge_dev, "RX bus error");
diff --git a/sys/mips/atheros/if_argevar.h b/sys/mips/atheros/if_argevar.h
index ae94588..cb533ac 100644
--- a/sys/mips/atheros/if_argevar.h
+++ b/sys/mips/atheros/if_argevar.h
@@ -214,6 +214,9 @@ struct arge_softc {
 		uint32_t	intr_stray2;
 		uint32_t	intr_ok;
 	} stats;
+	struct {
+		uint32_t	count[32];
+	} intr_stats;
 };
 
 #endif /* __IF_ARGEVAR_H__ */