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Subject[PATCH 09/11] virtio: provide a method to get the IRQ affinity mask for a virtqueue
Date
This basically passed up the pci_irq_get_affinity information through
virtio through an optional get_vq_affinity method. It is only implemented
by the PCI backend for now, and only when we use per-virtqueue IRQs.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
drivers/virtio/virtio_pci_common.c | 10 ++++++++++
drivers/virtio/virtio_pci_common.h | 2 ++
drivers/virtio/virtio_pci_legacy.c | 1 +
drivers/virtio/virtio_pci_modern.c | 2 ++
include/linux/virtio_config.h | 3 +++
5 files changed, 18 insertions(+)

diff --git a/drivers/virtio/virtio_pci_common.c b/drivers/virtio/virtio_pci_common.c
index df7164e..25622da 100644
--- a/drivers/virtio/virtio_pci_common.c
+++ b/drivers/virtio/virtio_pci_common.c
@@ -405,6 +405,16 @@ int vp_set_vq_affinity(struct virtqueue *vq, int cpu)
return 0;
}

+const struct cpumask *vp_get_vq_affinity(struct virtio_device *vdev, int index)
+{
+ struct virtio_pci_device *vp_dev = to_vp_device(vdev);
+ int vec = vp_dev->vqs[index]->msix_vector;
+
+ if (vec == VIRTIO_MSI_NO_VECTOR)
+ return NULL;
+ return pci_irq_get_affinity(vp_dev->pci_dev, vec);
+}
+
#ifdef CONFIG_PM_SLEEP
static int virtio_pci_freeze(struct device *dev)
{
diff --git a/drivers/virtio/virtio_pci_common.h b/drivers/virtio/virtio_pci_common.h
index 85010f0..d6c29c5 100644
--- a/drivers/virtio/virtio_pci_common.h
+++ b/drivers/virtio/virtio_pci_common.h
@@ -125,6 +125,8 @@ const char *vp_bus_name(struct virtio_device *vdev);
*/
int vp_set_vq_affinity(struct virtqueue *vq, int cpu);

+const struct cpumask *vp_get_vq_affinity(struct virtio_device *vdev, int index);
+
#if IS_ENABLED(CONFIG_VIRTIO_PCI_LEGACY)
int virtio_pci_legacy_probe(struct virtio_pci_device *);
void virtio_pci_legacy_remove(struct virtio_pci_device *);
diff --git a/drivers/virtio/virtio_pci_legacy.c b/drivers/virtio/virtio_pci_legacy.c
index f83829f..4930b23 100644
--- a/drivers/virtio/virtio_pci_legacy.c
+++ b/drivers/virtio/virtio_pci_legacy.c
@@ -194,6 +194,7 @@ static const struct virtio_config_ops virtio_pci_config_ops = {
.finalize_features = vp_finalize_features,
.bus_name = vp_bus_name,
.set_vq_affinity = vp_set_vq_affinity,
+ .get_vq_affinity = vp_get_vq_affinity,
};

/* the PCI probing function */
diff --git a/drivers/virtio/virtio_pci_modern.c b/drivers/virtio/virtio_pci_modern.c
index 975197b..cd09d78 100644
--- a/drivers/virtio/virtio_pci_modern.c
+++ b/drivers/virtio/virtio_pci_modern.c
@@ -441,6 +441,7 @@ static const struct virtio_config_ops virtio_pci_config_nodev_ops = {
.finalize_features = vp_finalize_features,
.bus_name = vp_bus_name,
.set_vq_affinity = vp_set_vq_affinity,
+ .get_vq_affinity = vp_get_vq_affinity,
};

static const struct virtio_config_ops virtio_pci_config_ops = {
@@ -456,6 +457,7 @@ static const struct virtio_config_ops virtio_pci_config_ops = {
.finalize_features = vp_finalize_features,
.bus_name = vp_bus_name,
.set_vq_affinity = vp_set_vq_affinity,
+ .get_vq_affinity = vp_get_vq_affinity,
};

/**
diff --git a/include/linux/virtio_config.h b/include/linux/virtio_config.h
index 2ebe506..8355bab 100644
--- a/include/linux/virtio_config.h
+++ b/include/linux/virtio_config.h
@@ -58,6 +58,7 @@ struct irq_affinity;
* This returns a pointer to the bus name a la pci_name from which
* the caller can then copy.
* @set_vq_affinity: set the affinity for a virtqueue.
+ * @get_vq_affinity: get the affinity for a virtqueue (optional).
*/
typedef void vq_callback_t(struct virtqueue *);
struct virtio_config_ops {
@@ -77,6 +78,8 @@ struct virtio_config_ops {
int (*finalize_features)(struct virtio_device *vdev);
const char *(*bus_name)(struct virtio_device *vdev);
int (*set_vq_affinity)(struct virtqueue *vq, int cpu);
+ const struct cpumask *(*get_vq_affinity)(struct virtio_device *vdev,
+ int index);
};

/* If driver didn't advertise the feature, it will never appear. */
--
2.1.4
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