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 <skoteshwar@marvell.com>
Reviewed-by: Dan Carpenter <dan.carpenter@linaro.org>
Acked-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: Shijith Thotton <sthotton@marvell.com>
Message-Id: <20250103153226.1933479-2-sthotton@marvell.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

diff --git a/drivers/vdpa/octeon_ep/octep_vdpa_main.c b/drivers/vdpa/octeon_ep/octep_vdpa_main.c
index e9c3e57b321f85583523c261a8406873f0cd8555..4d56be64ae56205d104831a86c716febed84faab 100644 (file)
--- a/drivers/vdpa/octeon_ep/octep_vdpa_main.c
+++ b/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;
 }