linux-kernel - [PATCH 2/4] vdpa/octeon_ep: handle device config change events

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Message-ID: <20241120070508.789508-2-sthotton@marvell.com>
Date: Wed, 20 Nov 2024 12:34:51 +0530
From: Shijith Thotton <sthotton@...vell.com>
To: <virtualization@...ts.linux.dev>, <mst@...hat.com>, <jasowang@...hat.com>
CC: Satha Rao <skoteshwar@...vell.com>, <schalla@...vell.com>,
        <vattunuru@...vell.com>, <ndabilpuram@...vell.com>,
        <jerinj@...vell.com>, Shijith Thotton <sthotton@...vell.com>,
        Xuan Zhuo
	<xuanzhuo@...ux.alibaba.com>,
        Eugenio Pérez
	<eperezma@...hat.com>,
        open list <linux-kernel@...r.kernel.org>
Subject: [PATCH 2/4] vdpa/octeon_ep: handle device config change events

From: Satha Rao <skoteshwar@...vell.com>

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@...vell.com>
Signed-off-by: Shijith Thotton <sthotton@...vell.com>
---
 drivers/vdpa/octeon_ep/octep_vdpa_main.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/vdpa/octeon_ep/octep_vdpa_main.c b/drivers/vdpa/octeon_ep/octep_vdpa_main.c
index 482c178a5221..6db951c6cb92 100644
--- a/drivers/vdpa/octeon_ep/octep_vdpa_main.c
+++ b/drivers/vdpa/octeon_ep/octep_vdpa_main.c
@@ -74,6 +74,14 @@ static irqreturn_t octep_vdpa_intr_handler(int irq, void *data)
 		}
 	}
 
+	/* Check for config interrupt. Config uses the first interrupt */
+	if (unlikely(ring_start == 0 && ioread8(oct_hw->isr))) {
+		iowrite8(0, oct_hw->isr);
+
+		if (likely(oct_hw->config_cb.callback))
+			oct_hw->config_cb.callback(oct_hw->config_cb.private);
+	}
+
 	return IRQ_HANDLED;
 }
 
-- 
2.25.1