linux-kernel - [PATCH 4/4] vdpa/octeon_ep: add interrupt handler for virtio crypto device

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Message-ID: <20241120070508.789508-4-sthotton@marvell.com>
Date: Wed, 20 Nov 2024 12:34:53 +0530
From: Shijith Thotton <sthotton@...vell.com>
To: <virtualization@...ts.linux.dev>, <mst@...hat.com>, <jasowang@...hat.com>
CC: Shijith Thotton <sthotton@...vell.com>, <schalla@...vell.com>,
        <vattunuru@...vell.com>, <ndabilpuram@...vell.com>,
        <jerinj@...vell.com>, Xuan Zhuo <xuanzhuo@...ux.alibaba.com>,
        Eugenio Pérez
	<eperezma@...hat.com>,
        Satha Rao <skoteshwar@...vell.com>,
        open list
	<linux-kernel@...r.kernel.org>
Subject: [PATCH 4/4] vdpa/octeon_ep: add interrupt handler for virtio crypto device

Introduced an interrupt handler for the virtio crypto device, as its
queue usage differs from that of network devices. While virtio network
device receives packets only on even-indexed queues, virtio crypto
device utilize all available queues for processing data.

Signed-off-by: Shijith Thotton <sthotton@...vell.com>
---
 drivers/vdpa/octeon_ep/octep_vdpa_main.c | 51 +++++++++++++++++++++++-
 1 file changed, 49 insertions(+), 2 deletions(-)

diff --git a/drivers/vdpa/octeon_ep/octep_vdpa_main.c b/drivers/vdpa/octeon_ep/octep_vdpa_main.c
index 6ead42d76415..1b65cb697fa5 100644
--- a/drivers/vdpa/octeon_ep/octep_vdpa_main.c
+++ b/drivers/vdpa/octeon_ep/octep_vdpa_main.c
@@ -44,7 +44,35 @@ static struct octep_hw *vdpa_to_octep_hw(struct vdpa_device *vdpa_dev)
 	return oct_vdpa->oct_hw;
 }
 
-static irqreturn_t octep_vdpa_intr_handler(int irq, void *data)
+static irqreturn_t octep_vdpa_crypto_irq_handler(int irq, void *data)
+{
+	struct octep_hw *oct_hw = data;
+	int i;
+
+	/* Each device interrupt (nb_irqs) maps to specific receive rings
+	 * (nr_vring) in a round-robin fashion.
+	 *
+	 * For example, if nb_irqs = 8 and nr_vring = 64:
+	 * 0 -> 0, 8, 16, 24, 32, 40, 48, 56;
+	 * 1 -> 1, 9, 17, 25, 33, 41, 49, 57;
+	 * ...
+	 * 7 -> 7, 15, 23, 31, 39, 47, 55, 63;
+	 */
+	for (i = irq - oct_hw->irqs[0]; i < oct_hw->nr_vring; i += oct_hw->nb_irqs) {
+		if (ioread32(oct_hw->vqs[i].cb_notify_addr)) {
+			/* Acknowledge the per ring notification to the device */
+			iowrite32(0, oct_hw->vqs[i].cb_notify_addr);
+
+			if (likely(oct_hw->vqs[i].cb.callback))
+				oct_hw->vqs[i].cb.callback(oct_hw->vqs[i].cb.private);
+			break;
+		}
+	}
+
+	return IRQ_HANDLED;
+}
+
+static irqreturn_t octep_vdpa_net_irq_handler(int irq, void *data)
 {
 	struct octep_hw *oct_hw = data;
 	int i, ring_start, ring_stride;
@@ -85,6 +113,18 @@ static irqreturn_t octep_vdpa_intr_handler(int irq, void *data)
 	return IRQ_HANDLED;
 }
 
+static irqreturn_t (*octep_vdpa_get_irq_handler(u32 dev_id))(int, void *)
+{
+	switch (dev_id) {
+	case VIRTIO_ID_NET:
+		return octep_vdpa_net_irq_handler;
+	case VIRTIO_ID_CRYPTO:
+		return octep_vdpa_crypto_irq_handler;
+	default:
+		return NULL;
+	}
+}
+
 static void octep_free_irqs(struct octep_hw *oct_hw)
 {
 	struct pci_dev *pdev = oct_hw->pdev;
@@ -103,6 +143,7 @@ static void octep_free_irqs(struct octep_hw *oct_hw)
 
 static int octep_request_irqs(struct octep_hw *oct_hw)
 {
+	irqreturn_t (*irq_handler)(int irq, void *data);
 	struct pci_dev *pdev = oct_hw->pdev;
 	int ret, irq, idx;
 
@@ -119,10 +160,16 @@ static int octep_request_irqs(struct octep_hw *oct_hw)
 	}
 
 	memset(oct_hw->irqs, -1, sizeof(oct_hw->irqs));
+	irq_handler = octep_vdpa_get_irq_handler(oct_hw->dev_id);
+	if (!irq_handler) {
+		dev_err(&pdev->dev, "Invalid device id %d\n", oct_hw->dev_id);
+		ret = -EINVAL;
+		goto free_irqs;
+	}
 
 	for (idx = 0; idx < oct_hw->nb_irqs; idx++) {
 		irq = pci_irq_vector(pdev, idx);
-		ret = devm_request_irq(&pdev->dev, irq, octep_vdpa_intr_handler, 0,
+		ret = devm_request_irq(&pdev->dev, irq, irq_handler, 0,
 				       dev_name(&pdev->dev), oct_hw);
 		if (ret) {
 			dev_err(&pdev->dev, "Failed to register interrupt handler\n");
-- 
2.25.1