vdpa/octeon_ep: handle device config change events

The first interrupt of the device is used to notify the host about
device configuration changes, such as link status updates. The ISR
configuration area is updated to indicate a config change event when
triggered.

Signed-off-by: Satha Rao <[email protected]>
Reviewed-by: Dan Carpenter <[email protected]>
Acked-by: Jason Wang <[email protected]>
Signed-off-by: Shijith Thotton <[email protected]>
Message-Id: <[email protected]>
Signed-off-by: Michael S. Tsirkin <[email protected]>

Author: ksatha

drivers/vdpa/octeon_ep/octep_vdpa_main.c

@@ -71,6 +71,14 @@ static irqreturn_t octep_vdpa_intr_handler(int irq, void *data)
 		}
 	}
 
+	/* Check for config interrupt. Config uses the first interrupt */
+	if (unlikely(irq == oct_hw->irqs[0] && ioread8(oct_hw->isr))) {
+		iowrite8(0, oct_hw->isr);
+
+		if (oct_hw->config_cb.callback)
+			oct_hw->config_cb.callback(oct_hw->config_cb.private);
+	}
+
 	return IRQ_HANDLED;
 }