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Subject[net-next RFC V4 PATCH 3/4] virtio: introduce a method to get the irq of a specific virtqueue
Date
Device specific irq optimizations such as irq affinity may be used by virtio
drivers. So this patch introduce a new method to get the irq of a specific
virtqueue.

After this patch, virtio device drivers could query the irq and do device
specific optimizations. First user would be virtio-net.

Signed-off-by: Jason Wang <jasowang@redhat.com>
---
drivers/lguest/lguest_device.c | 8 ++++++++
drivers/s390/kvm/kvm_virtio.c | 6 ++++++
drivers/virtio/virtio_mmio.c | 8 ++++++++
drivers/virtio/virtio_pci.c | 12 ++++++++++++
include/linux/virtio_config.h | 4 ++++
5 files changed, 38 insertions(+), 0 deletions(-)
diff --git a/drivers/lguest/lguest_device.c b/drivers/lguest/lguest_device.c
index 9e8388e..bcd080f 100644
--- a/drivers/lguest/lguest_device.c
+++ b/drivers/lguest/lguest_device.c
@@ -392,6 +392,13 @@ static const char *lg_bus_name(struct virtio_device *vdev)
return "";
}

+static int lg_get_vq_irq(struct virtio_device *vdev, struct virtqueue *vq)
+{
+ struct lguest_vq_info *lvq = vq->priv;
+
+ return lvq->config.irq;
+}
+
/* The ops structure which hooks everything together. */
static struct virtio_config_ops lguest_config_ops = {
.get_features = lg_get_features,
@@ -404,6 +411,7 @@ static struct virtio_config_ops lguest_config_ops = {
.find_vqs = lg_find_vqs,
.del_vqs = lg_del_vqs,
.bus_name = lg_bus_name,
+ .get_vq_irq = lg_get_vq_irq,
};

/*
diff --git a/drivers/s390/kvm/kvm_virtio.c b/drivers/s390/kvm/kvm_virtio.c
index d74e9ae..a897de2 100644
--- a/drivers/s390/kvm/kvm_virtio.c
+++ b/drivers/s390/kvm/kvm_virtio.c
@@ -268,6 +268,11 @@ static const char *kvm_bus_name(struct virtio_device *vdev)
return "";
}

+static int kvm_get_vq_irq(struct virtio_device *vdev, struct virtqueue *vq)
+{
+ return 0x2603;
+}
+
/*
* The config ops structure as defined by virtio config
*/
@@ -282,6 +287,7 @@ static struct virtio_config_ops kvm_vq_configspace_ops = {
.find_vqs = kvm_find_vqs,
.del_vqs = kvm_del_vqs,
.bus_name = kvm_bus_name,
+ .get_vq_irq = kvm_get_vq_irq,
};

/*
diff --git a/drivers/virtio/virtio_mmio.c b/drivers/virtio/virtio_mmio.c
index f5432b6..2ba37ed 100644
--- a/drivers/virtio/virtio_mmio.c
+++ b/drivers/virtio/virtio_mmio.c
@@ -411,6 +411,13 @@ static const char *vm_bus_name(struct virtio_device *vdev)
return vm_dev->pdev->name;
}

+static int vm_get_vq_irq(struct virtio_device *vdev, struct virtqueue *vq)
+{
+ struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev);
+
+ return platform_get_irq(vm_dev->pdev, 0);
+}
+
static struct virtio_config_ops virtio_mmio_config_ops = {
.get = vm_get,
.set = vm_set,
@@ -422,6 +429,7 @@ static struct virtio_config_ops virtio_mmio_config_ops = {
.get_features = vm_get_features,
.finalize_features = vm_finalize_features,
.bus_name = vm_bus_name,
+ .get_vq_irq = vm_get_vq_irq,
};


diff --git a/drivers/virtio/virtio_pci.c b/drivers/virtio/virtio_pci.c
index adb24f2..c062227 100644
--- a/drivers/virtio/virtio_pci.c
+++ b/drivers/virtio/virtio_pci.c
@@ -607,6 +607,17 @@ static const char *vp_bus_name(struct virtio_device *vdev)
return pci_name(vp_dev->pci_dev);
}

+static int vp_get_vq_irq(struct virtio_device *vdev, struct virtqueue *vq)
+{
+ struct virtio_pci_device *vp_dev = to_vp_device(vdev);
+ struct virtio_pci_vq_info *info = vq->priv;
+
+ if (vp_dev->intx_enabled)
+ return vp_dev->pci_dev->irq;
+ else
+ return vp_dev->msix_entries[info->msix_vector].vector;
+}
+
static struct virtio_config_ops virtio_pci_config_ops = {
.get = vp_get,
.set = vp_set,
@@ -618,6 +629,7 @@ static struct virtio_config_ops virtio_pci_config_ops = {
.get_features = vp_get_features,
.finalize_features = vp_finalize_features,
.bus_name = vp_bus_name,
+ .get_vq_irq = vp_get_vq_irq,
};

static void virtio_pci_release_dev(struct device *_d)
diff --git a/include/linux/virtio_config.h b/include/linux/virtio_config.h
index fc457f4..acd6930 100644
--- a/include/linux/virtio_config.h
+++ b/include/linux/virtio_config.h
@@ -98,6 +98,9 @@
* vdev: the virtio_device
* This returns a pointer to the bus name a la pci_name from which
* the caller can then copy.
+ * @get_vq_irq: get the irq numer of the specific virt queue.
+ * vdev: the virtio_device
+ * vq: the virtqueue
*/
typedef void vq_callback_t(struct virtqueue *);
struct virtio_config_ops {
@@ -116,6 +119,7 @@ struct virtio_config_ops {
u32 (*get_features)(struct virtio_device *vdev);
void (*finalize_features)(struct virtio_device *vdev);
const char *(*bus_name)(struct virtio_device *vdev);
+ int (*get_vq_irq)(struct virtio_device *vdev, struct virtqueue *vq);
};

/* If driver didn't advertise the feature, it will never appear. */
--
1.7.1


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