linux-kernel - [PATCH v2 03/11] vdpa: Add set_irq_affinity callback in vdpa_config

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Date:   Mon,  5 Dec 2022 16:41:19 +0800
From:   Xie Yongji <xieyongji@...edance.com>
To:     mst@...hat.com, jasowang@...hat.com, tglx@...utronix.de, hch@....de
Cc:     virtualization@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v2 03/11] vdpa: Add set_irq_affinity callback in vdpa_config_ops

This introduces set_irq_affinity callback in
vdpa_config_ops so that vdpa device driver can
get the interrupt affinity hint from the virtio
device driver. The interrupt affinity hint would
be needed by the interrupt affinity spreading
mechanism.

Signed-off-by: Xie Yongji <xieyongji@...edance.com>
---
 drivers/virtio/virtio_vdpa.c | 4 ++++
 include/linux/vdpa.h         | 8 ++++++++
 2 files changed, 12 insertions(+)

diff --git a/drivers/virtio/virtio_vdpa.c b/drivers/virtio/virtio_vdpa.c
index 08084b49e5a1..4731e4616ee0 100644
--- a/drivers/virtio/virtio_vdpa.c
+++ b/drivers/virtio/virtio_vdpa.c
@@ -275,9 +275,13 @@ static int virtio_vdpa_find_vqs(struct virtio_device *vdev, unsigned int nvqs,
 	struct virtio_vdpa_device *vd_dev = to_virtio_vdpa_device(vdev);
 	struct vdpa_device *vdpa = vd_get_vdpa(vdev);
 	const struct vdpa_config_ops *ops = vdpa->config;
+	struct irq_affinity default_affd = { 0 };
 	struct vdpa_callback cb;
 	int i, err, queue_idx = 0;
 
+	if (ops->set_irq_affinity)
+		ops->set_irq_affinity(vdpa, desc ? desc : &default_affd);
+
 	for (i = 0; i < nvqs; ++i) {
 		if (!names[i]) {
 			vqs[i] = NULL;
diff --git a/include/linux/vdpa.h b/include/linux/vdpa.h
index 0ff6c9363356..482ff7d0206f 100644
--- a/include/linux/vdpa.h
+++ b/include/linux/vdpa.h
@@ -256,6 +256,12 @@ struct vdpa_map_file {
  *				@vdev: vdpa device
  *				@idx: virtqueue index
  *				Returns the irq affinity mask
+ * @set_irq_affinity:		Pass the irq affinity hint from the virtio
+ *				device driver to vdpa driver (optional).
+ *				Needed by the interrupt affinity spreading
+ *				mechanism.
+ *				@vdev: vdpa device
+ *				@desc: irq affinity hint
  * @set_group_asid:		Set address space identifier for a
  *				virtqueue group (optional)
  *				@vdev: vdpa device
@@ -344,6 +350,8 @@ struct vdpa_config_ops {
 			       const struct cpumask *cpu_mask);
 	const struct cpumask *(*get_vq_affinity)(struct vdpa_device *vdev,
 						 u16 idx);
+	void (*set_irq_affinity)(struct vdpa_device *vdev,
+				 struct irq_affinity *desc);
 
 	/* DMA ops */
 	int (*set_map)(struct vdpa_device *vdev, unsigned int asid,
-- 
2.20.1