linux-kernel - [PATCH v2 07/11] vduse: Support set/get_vq

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Date:   Mon,  5 Dec 2022 17:02:39 +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 07/11] vduse: Support set/get_vq_affinity callbacks

Since we already support irq callback affinity management,
let's implement the set/get_vq_affinity callbacks to make
it possible for the virtio device driver to change or be
aware of the affinity. This would make it possible for the
virtio-blk driver to build the blk-mq queues based on the
irq callback affinity.

Signed-off-by: Xie Yongji <xieyongji@...edance.com>
---
 drivers/vdpa/vdpa_user/vduse_dev.c | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/drivers/vdpa/vdpa_user/vduse_dev.c b/drivers/vdpa/vdpa_user/vduse_dev.c
index 90c2896039d9..6507a78abc9d 100644
--- a/drivers/vdpa/vdpa_user/vduse_dev.c
+++ b/drivers/vdpa/vdpa_user/vduse_dev.c
@@ -739,6 +739,28 @@ static void vduse_vq_update_effective_cpu(struct vduse_virtqueue *vq)
 	spin_unlock(&vq->irq_affinity_lock);
 }
 
+static int vduse_vdpa_set_vq_affinity(struct vdpa_device *vdpa, u16 idx,
+				      const struct cpumask *cpu_mask)
+{
+	struct vduse_dev *dev = vdpa_to_vduse(vdpa);
+
+	cpumask_copy(&dev->vqs[idx]->irq_affinity, cpu_mask);
+	vduse_vq_update_effective_cpu(dev->vqs[idx]);
+
+	return 0;
+}
+
+static const struct cpumask *
+vduse_vdpa_get_vq_affinity(struct vdpa_device *vdpa, u16 idx)
+{
+	struct vduse_dev *dev = vdpa_to_vduse(vdpa);
+
+	if (dev->vqs[idx]->irq_effective_cpu == -1)
+		return NULL;
+
+	return &dev->vqs[idx]->irq_affinity;
+}
+
 static void vduse_vdpa_set_irq_affinity(struct vdpa_device *vdpa,
 					struct irq_affinity *desc)
 {
@@ -807,6 +829,8 @@ static const struct vdpa_config_ops vduse_vdpa_config_ops = {
 	.get_config		= vduse_vdpa_get_config,
 	.set_config		= vduse_vdpa_set_config,
 	.get_generation		= vduse_vdpa_get_generation,
+	.set_vq_affinity	= vduse_vdpa_set_vq_affinity,
+	.get_vq_affinity	= vduse_vdpa_get_vq_affinity,
 	.set_irq_affinity	= vduse_vdpa_set_irq_affinity,
 	.reset			= vduse_vdpa_reset,
 	.set_map		= vduse_vdpa_set_map,
-- 
2.20.1