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Subject[PATCH v2 02/11] vdpa: Add set/get_vq_affinity callbacks in vdpa_config_ops
Date
This introduces set/get_vq_affinity callbacks in
vdpa_config_ops to support interrupt affinity
management for vdpa device drivers.

Signed-off-by: Xie Yongji <xieyongji@bytedance.com>
---
drivers/virtio/virtio_vdpa.c | 28 ++++++++++++++++++++++++++++
include/linux/vdpa.h | 13 +++++++++++++
2 files changed, 41 insertions(+)

diff --git a/drivers/virtio/virtio_vdpa.c b/drivers/virtio/virtio_vdpa.c
index 9670cc79371d..08084b49e5a1 100644
--- a/drivers/virtio/virtio_vdpa.c
+++ b/drivers/virtio/virtio_vdpa.c
@@ -330,6 +330,32 @@ static const char *virtio_vdpa_bus_name(struct virtio_device *vdev)
return dev_name(&vdpa->dev);
}

+static int virtio_vdpa_set_vq_affinity(struct virtqueue *vq,
+ const struct cpumask *cpu_mask)
+{
+ struct virtio_vdpa_device *vd_dev = to_virtio_vdpa_device(vq->vdev);
+ struct vdpa_device *vdpa = vd_dev->vdpa;
+ const struct vdpa_config_ops *ops = vdpa->config;
+ unsigned int index = vq->index;
+
+ if (ops->set_vq_affinity)
+ return ops->set_vq_affinity(vdpa, index, cpu_mask);
+
+ return 0;
+}
+
+static const struct cpumask *
+virtio_vdpa_get_vq_affinity(struct virtio_device *vdev, int index)
+{
+ struct vdpa_device *vdpa = vd_get_vdpa(vdev);
+ const struct vdpa_config_ops *ops = vdpa->config;
+
+ if (ops->get_vq_affinity)
+ return ops->get_vq_affinity(vdpa, index);
+
+ return NULL;
+}
+
static const struct virtio_config_ops virtio_vdpa_config_ops = {
.get = virtio_vdpa_get,
.set = virtio_vdpa_set,
@@ -342,6 +368,8 @@ static const struct virtio_config_ops virtio_vdpa_config_ops = {
.get_features = virtio_vdpa_get_features,
.finalize_features = virtio_vdpa_finalize_features,
.bus_name = virtio_vdpa_bus_name,
+ .set_vq_affinity = virtio_vdpa_set_vq_affinity,
+ .get_vq_affinity = virtio_vdpa_get_vq_affinity,
};

static void virtio_vdpa_release_dev(struct device *_d)
diff --git a/include/linux/vdpa.h b/include/linux/vdpa.h
index 6d0f5e4e82c2..0ff6c9363356 100644
--- a/include/linux/vdpa.h
+++ b/include/linux/vdpa.h
@@ -247,6 +247,15 @@ struct vdpa_map_file {
* @vdev: vdpa device
* Returns the iova range supported by
* the device.
+ * @set_vq_affinity: Set the irq affinity of virtqueue (optional)
+ * @vdev: vdpa device
+ * @idx: virtqueue index
+ * @cpu_mask: irq affinity mask
+ * Returns integer: success (0) or error (< 0)
+ * @get_vq_affinity: Get the irq affinity of virtqueue (optional)
+ * @vdev: vdpa device
+ * @idx: virtqueue index
+ * Returns the irq affinity mask
* @set_group_asid: Set address space identifier for a
* virtqueue group (optional)
* @vdev: vdpa device
@@ -331,6 +340,10 @@ struct vdpa_config_ops {
const void *buf, unsigned int len);
u32 (*get_generation)(struct vdpa_device *vdev);
struct vdpa_iova_range (*get_iova_range)(struct vdpa_device *vdev);
+ int (*set_vq_affinity)(struct vdpa_device *vdev, u16 idx,
+ const struct cpumask *cpu_mask);
+ const struct cpumask *(*get_vq_affinity)(struct vdpa_device *vdev,
+ u16 idx);

/* DMA ops */
int (*set_map)(struct vdpa_device *vdev, unsigned int asid,
--
2.20.1
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