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Date: Wed, 29 Aug 2012 15:54:36 +0800
From: Jason Wang <jasowang@...hat.com>
To: Paolo Bonzini <pbonzini@...hat.com>
CC: linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org,
kvm@...r.kernel.org, rusty@...tcorp.com.au, mst@...hat.com,
virtualization@...ts.linux-foundation.org
Subject: Re: [PATCH 1/5] virtio-ring: move queue_index to vring_virtqueue
On 08/28/2012 07:54 PM, Paolo Bonzini wrote:
> From: Jason Wang<jasowang@...hat.com>
>
> Instead of storing the queue index in transport-specific virtio structs,
> this patch moves them to vring_virtqueue and introduces an helper to get
> the value. This lets drivers simplify their management and tracing of
> virtqueues.
>
> Signed-off-by: Jason Wang<jasowang@...hat.com>
> Signed-off-by: Paolo Bonzini<pbonzini@...hat.com>
> ---
> I fixed the problems in Jason's v5 (posted at
> http://permalink.gmane.org/gmane.linux.kernel.virtualization/15910)
> and switched from virtio_set_queue_index to a new argument of
> vring_new_virtqueue. This breaks at compile-time any virtio
> transport that is not updated.
Thanks Paolo. I'm fine with this patch.
>
> drivers/lguest/lguest_device.c | 2 +-
> drivers/remoteproc/remoteproc_virtio.c | 2 +-
> drivers/s390/kvm/kvm_virtio.c | 2 +-
> drivers/virtio/virtio_mmio.c | 12 ++++--------
> drivers/virtio/virtio_pci.c | 13 +++++--------
> drivers/virtio/virtio_ring.c | 14 +++++++++++++-
> include/linux/virtio.h | 2 ++
> include/linux/virtio_ring.h | 3 ++-
> 8 files changed, 29 insertions(+), 21 deletions(-)
>
> diff --git a/drivers/lguest/lguest_device.c b/drivers/lguest/lguest_device.c
> index 9e8388e..ccb7dfb 100644
> --- a/drivers/lguest/lguest_device.c
> +++ b/drivers/lguest/lguest_device.c
> @@ -296,7 +296,7 @@ static struct virtqueue *lg_find_vq(struct virtio_device *vdev,
> * to 'true': the host just a(nother) SMP CPU, so we only need inter-cpu
> * barriers.
> */
> - vq = vring_new_virtqueue(lvq->config.num, LGUEST_VRING_ALIGN, vdev,
> + vq = vring_new_virtqueue(index, lvq->config.num, LGUEST_VRING_ALIGN, vdev,
> true, lvq->pages, lg_notify, callback, name);
> if (!vq) {
> err = -ENOMEM;
> diff --git a/drivers/remoteproc/remoteproc_virtio.c b/drivers/remoteproc/remoteproc_virtio.c
> index 3541b44..343c194 100644
> --- a/drivers/remoteproc/remoteproc_virtio.c
> +++ b/drivers/remoteproc/remoteproc_virtio.c
> @@ -103,7 +103,7 @@ static struct virtqueue *rp_find_vq(struct virtio_device *vdev,
> * Create the new vq, and tell virtio we're not interested in
> * the 'weak' smp barriers, since we're talking with a real device.
> */
> - vq = vring_new_virtqueue(len, rvring->align, vdev, false, addr,
> + vq = vring_new_virtqueue(id, len, rvring->align, vdev, false, addr,
> rproc_virtio_notify, callback, name);
> if (!vq) {
> dev_err(dev, "vring_new_virtqueue %s failed\n", name);
> diff --git a/drivers/s390/kvm/kvm_virtio.c b/drivers/s390/kvm/kvm_virtio.c
> index 47cccd5..5565af2 100644
> --- a/drivers/s390/kvm/kvm_virtio.c
> +++ b/drivers/s390/kvm/kvm_virtio.c
> @@ -198,7 +198,7 @@ static struct virtqueue *kvm_find_vq(struct virtio_device *vdev,
> if (err)
> goto out;
>
> - vq = vring_new_virtqueue(config->num, KVM_S390_VIRTIO_RING_ALIGN,
> + vq = vring_new_virtqueue(index, config->num, KVM_S390_VIRTIO_RING_ALIGN,
> vdev, true, (void *) config->address,
> kvm_notify, callback, name);
> if (!vq) {
> diff --git a/drivers/virtio/virtio_mmio.c b/drivers/virtio/virtio_mmio.c
> index 453db0c..008bf58 100644
> --- a/drivers/virtio/virtio_mmio.c
> +++ b/drivers/virtio/virtio_mmio.c
> @@ -131,9 +131,6 @@ struct virtio_mmio_vq_info {
> /* the number of entries in the queue */
> unsigned int num;
>
> - /* the index of the queue */
> - int queue_index;
> -
> /* the virtual address of the ring queue */
> void *queue;
>
> @@ -225,11 +222,10 @@ static void vm_reset(struct virtio_device *vdev)
> static void vm_notify(struct virtqueue *vq)
> {
> struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vq->vdev);
> - struct virtio_mmio_vq_info *info = vq->priv;
>
> /* We write the queue's selector into the notification register to
> * signal the other end */
> - writel(info->queue_index, vm_dev->base + VIRTIO_MMIO_QUEUE_NOTIFY);
> + writel(virtqueue_get_queue_index(vq), vm_dev->base + VIRTIO_MMIO_QUEUE_NOTIFY);
> }
>
> /* Notify all virtqueues on an interrupt. */
> @@ -270,6 +266,7 @@ static void vm_del_vq(struct virtqueue *vq)
> struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vq->vdev);
> struct virtio_mmio_vq_info *info = vq->priv;
> unsigned long flags, size;
> + unsigned int index = virtqueue_get_queue_index(vq);
>
> spin_lock_irqsave(&vm_dev->lock, flags);
> list_del(&info->node);
> @@ -278,7 +275,7 @@ static void vm_del_vq(struct virtqueue *vq)
> vring_del_virtqueue(vq);
>
> /* Select and deactivate the queue */
> - writel(info->queue_index, vm_dev->base + VIRTIO_MMIO_QUEUE_SEL);
> + writel(index, vm_dev->base + VIRTIO_MMIO_QUEUE_SEL);
> writel(0, vm_dev->base + VIRTIO_MMIO_QUEUE_PFN);
>
> size = PAGE_ALIGN(vring_size(info->num, VIRTIO_MMIO_VRING_ALIGN));
> @@ -324,7 +321,6 @@ static struct virtqueue *vm_setup_vq(struct virtio_device *vdev, unsigned index,
> err = -ENOMEM;
> goto error_kmalloc;
> }
> - info->queue_index = index;
>
> /* Allocate pages for the queue - start with a queue as big as
> * possible (limited by maximum size allowed by device), drop down
> @@ -356,7 +352,7 @@ static struct virtqueue *vm_setup_vq(struct virtio_device *vdev, unsigned index,
> vm_dev->base + VIRTIO_MMIO_QUEUE_PFN);
>
> /* Create the vring */
> - vq = vring_new_virtqueue(info->num, VIRTIO_MMIO_VRING_ALIGN, vdev,
> + vq = vring_new_virtqueue(index, info->num, VIRTIO_MMIO_VRING_ALIGN, vdev,
> true, info->queue, vm_notify, callback, name);
> if (!vq) {
> err = -ENOMEM;
> diff --git a/drivers/virtio/virtio_pci.c b/drivers/virtio/virtio_pci.c
> index 2e03d41..d902464 100644
> --- a/drivers/virtio/virtio_pci.c
> +++ b/drivers/virtio/virtio_pci.c
> @@ -79,9 +79,6 @@ struct virtio_pci_vq_info
> /* the number of entries in the queue */
> int num;
>
> - /* the index of the queue */
> - int queue_index;
> -
> /* the virtual address of the ring queue */
> void *queue;
>
> @@ -202,11 +199,11 @@ static void vp_reset(struct virtio_device *vdev)
> static void vp_notify(struct virtqueue *vq)
> {
> struct virtio_pci_device *vp_dev = to_vp_device(vq->vdev);
> - struct virtio_pci_vq_info *info = vq->priv;
>
> /* we write the queue's selector into the notification register to
> * signal the other end */
> - iowrite16(info->queue_index, vp_dev->ioaddr + VIRTIO_PCI_QUEUE_NOTIFY);
> + iowrite16(virtqueue_get_queue_index(vq),
> + vp_dev->ioaddr + VIRTIO_PCI_QUEUE_NOTIFY);
> }
>
> /* Handle a configuration change: Tell driver if it wants to know. */
> @@ -402,7 +399,6 @@ static struct virtqueue *setup_vq(struct virtio_device *vdev, unsigned index,
> if (!info)
> return ERR_PTR(-ENOMEM);
>
> - info->queue_index = index;
> info->num = num;
> info->msix_vector = msix_vec;
>
> @@ -418,7 +414,7 @@ static struct virtqueue *setup_vq(struct virtio_device *vdev, unsigned index,
> vp_dev->ioaddr + VIRTIO_PCI_QUEUE_PFN);
>
> /* create the vring */
> - vq = vring_new_virtqueue(info->num, VIRTIO_PCI_VRING_ALIGN, vdev,
> + vq = vring_new_virtqueue(index, info->num, VIRTIO_PCI_VRING_ALIGN, vdev,
> true, info->queue, vp_notify, callback, name);
> if (!vq) {
> err = -ENOMEM;
> @@ -467,7 +463,8 @@ static void vp_del_vq(struct virtqueue *vq)
> list_del(&info->node);
> spin_unlock_irqrestore(&vp_dev->lock, flags);
>
> - iowrite16(info->queue_index, vp_dev->ioaddr + VIRTIO_PCI_QUEUE_SEL);
> + iowrite16(virtqueue_get_queue_index(vq),
> + vp_dev->ioaddr + VIRTIO_PCI_QUEUE_SEL);
>
> if (vp_dev->msix_enabled) {
> iowrite16(VIRTIO_MSI_NO_VECTOR,
> diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
> index 5aa43c3..e639584 100644
> --- a/drivers/virtio/virtio_ring.c
> +++ b/drivers/virtio/virtio_ring.c
> @@ -106,6 +106,9 @@ struct vring_virtqueue
> /* How to notify other side. FIXME: commonalize hcalls! */
> void (*notify)(struct virtqueue *vq);
>
> + /* Index of the queue */
> + int queue_index;
> +
> #ifdef DEBUG
> /* They're supposed to lock for us. */
> unsigned int in_use;
> @@ -171,6 +174,13 @@ static int vring_add_indirect(struct vring_virtqueue *vq,
> return head;
> }
>
> +int virtqueue_get_queue_index(struct virtqueue *_vq)
> +{
> + struct vring_virtqueue *vq = to_vvq(_vq);
> + return vq->queue_index;
> +}
> +EXPORT_SYMBOL_GPL(virtqueue_get_queue_index);
> +
> /**
> * virtqueue_add_buf - expose buffer to other end
> * @vq: the struct virtqueue we're talking about.
> @@ -616,7 +626,8 @@ irqreturn_t vring_interrupt(int irq, void *_vq)
> }
> EXPORT_SYMBOL_GPL(vring_interrupt);
>
> -struct virtqueue *vring_new_virtqueue(unsigned int num,
> +struct virtqueue *vring_new_virtqueue(unsigned int index,
> + unsigned int num,
> unsigned int vring_align,
> struct virtio_device *vdev,
> bool weak_barriers,
> @@ -647,6 +658,7 @@ struct virtqueue *vring_new_virtqueue(unsigned int num,
> vq->broken = false;
> vq->last_used_idx = 0;
> vq->num_added = 0;
> + vq->queue_index = index;
> list_add_tail(&vq->vq.list,&vdev->vqs);
> #ifdef DEBUG
> vq->in_use = false;
> diff --git a/include/linux/virtio.h b/include/linux/virtio.h
> index a1ba8bb..533b115 100644
> --- a/include/linux/virtio.h
> +++ b/include/linux/virtio.h
> @@ -50,6 +50,8 @@ void *virtqueue_detach_unused_buf(struct virtqueue *vq);
>
> unsigned int virtqueue_get_vring_size(struct virtqueue *vq);
>
> +int virtqueue_get_queue_index(struct virtqueue *vq);
> +
> /**
> * virtio_device - representation of a device using virtio
> * @index: unique position on the virtio bus
> diff --git a/include/linux/virtio_ring.h b/include/linux/virtio_ring.h
> index e338730..c2d793a 100644
> --- a/include/linux/virtio_ring.h
> +++ b/include/linux/virtio_ring.h
> @@ -165,7 +165,8 @@ static inline int vring_need_event(__u16 event_idx, __u16 new_idx, __u16 old)
> struct virtio_device;
> struct virtqueue;
>
> -struct virtqueue *vring_new_virtqueue(unsigned int num,
> +struct virtqueue *vring_new_virtqueue(unsigned int index,
> + unsigned int num,
> unsigned int vring_align,
> struct virtio_device *vdev,
> bool weak_barriers,
--
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