Re: [PATCH v9 25/32] virtio_pci: support the arg sizes of find_vqs()

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在 2022/4/6 上午11:43, Xuan Zhuo 写道:
Virtio PCI supports new parameter sizes of find_vqs().

Signed-off-by: Xuan Zhuo <xuanzhuo@xxxxxxxxxxxxxxxxx>


Acked-by: Jason Wang <jasowang@xxxxxxxxxx>


---
  drivers/virtio/virtio_pci_common.c | 18 ++++++++++--------
  drivers/virtio/virtio_pci_common.h |  1 +
  drivers/virtio/virtio_pci_legacy.c |  6 +++++-
  drivers/virtio/virtio_pci_modern.c | 10 +++++++---
  4 files changed, 23 insertions(+), 12 deletions(-)

diff --git a/drivers/virtio/virtio_pci_common.c b/drivers/virtio/virtio_pci_common.c
index 826ea2e35d54..23976c61583f 100644
--- a/drivers/virtio/virtio_pci_common.c
+++ b/drivers/virtio/virtio_pci_common.c
@@ -208,6 +208,7 @@ static int vp_request_msix_vectors(struct virtio_device *vdev, int nvectors,
  static struct virtqueue *vp_setup_vq(struct virtio_device *vdev, unsigned index,
  				     void (*callback)(struct virtqueue *vq),
  				     const char *name,
+				     u32 size,
  				     bool ctx,
  				     u16 msix_vec)
  {
@@ -220,7 +221,7 @@ static struct virtqueue *vp_setup_vq(struct virtio_device *vdev, unsigned index,
  	if (!info)
  		return ERR_PTR(-ENOMEM);
- vq = vp_dev->setup_vq(vp_dev, info, index, callback, name, ctx,
+	vq = vp_dev->setup_vq(vp_dev, info, index, callback, name, size, ctx,
  			      msix_vec);
  	if (IS_ERR(vq))
  		goto out_info;
@@ -314,7 +315,7 @@ void vp_del_vqs(struct virtio_device *vdev)
static int vp_find_vqs_msix(struct virtio_device *vdev, unsigned nvqs,
  		struct virtqueue *vqs[], vq_callback_t *callbacks[],
-		const char * const names[], bool per_vq_vectors,
+		const char * const names[], u32 sizes[], bool per_vq_vectors,
  		const bool *ctx,
  		struct irq_affinity *desc)
  {
@@ -357,8 +358,8 @@ static int vp_find_vqs_msix(struct virtio_device *vdev, unsigned nvqs,
  		else
  			msix_vec = VP_MSIX_VQ_VECTOR;
  		vqs[i] = vp_setup_vq(vdev, queue_idx++, callbacks[i], names[i],
-				     ctx ? ctx[i] : false,
-				     msix_vec);
+				     sizes ? sizes[i] : 0,
+				     ctx ? ctx[i] : false, msix_vec);
  		if (IS_ERR(vqs[i])) {
  			err = PTR_ERR(vqs[i]);
  			goto error_find;
@@ -388,7 +389,7 @@ static int vp_find_vqs_msix(struct virtio_device *vdev, unsigned nvqs,
static int vp_find_vqs_intx(struct virtio_device *vdev, unsigned nvqs,
  		struct virtqueue *vqs[], vq_callback_t *callbacks[],
-		const char * const names[], const bool *ctx)
+		const char * const names[], u32 sizes[], const bool *ctx)
  {
  	struct virtio_pci_device *vp_dev = to_vp_device(vdev);
  	int i, err, queue_idx = 0;
@@ -410,6 +411,7 @@ static int vp_find_vqs_intx(struct virtio_device *vdev, unsigned nvqs,
  			continue;
  		}
  		vqs[i] = vp_setup_vq(vdev, queue_idx++, callbacks[i], names[i],
+				     sizes ? sizes[i] : 0,
  				     ctx ? ctx[i] : false,
  				     VIRTIO_MSI_NO_VECTOR);
  		if (IS_ERR(vqs[i])) {
@@ -433,15 +435,15 @@ int vp_find_vqs(struct virtio_device *vdev, unsigned nvqs,
  	int err;
/* Try MSI-X with one vector per queue. */
-	err = vp_find_vqs_msix(vdev, nvqs, vqs, callbacks, names, true, ctx, desc);
+	err = vp_find_vqs_msix(vdev, nvqs, vqs, callbacks, names, sizes, true, ctx, desc);
  	if (!err)
  		return 0;
  	/* Fallback: MSI-X with one vector for config, one shared for queues. */
-	err = vp_find_vqs_msix(vdev, nvqs, vqs, callbacks, names, false, ctx, desc);
+	err = vp_find_vqs_msix(vdev, nvqs, vqs, callbacks, names, sizes, false, ctx, desc);
  	if (!err)
  		return 0;
  	/* Finally fall back to regular interrupts. */
-	return vp_find_vqs_intx(vdev, nvqs, vqs, callbacks, names, ctx);
+	return vp_find_vqs_intx(vdev, nvqs, vqs, callbacks, names, sizes, ctx);
  }
const char *vp_bus_name(struct virtio_device *vdev)
diff --git a/drivers/virtio/virtio_pci_common.h b/drivers/virtio/virtio_pci_common.h
index 859eed559e10..fbf5a6d4b164 100644
--- a/drivers/virtio/virtio_pci_common.h
+++ b/drivers/virtio/virtio_pci_common.h
@@ -81,6 +81,7 @@ struct virtio_pci_device {
  				      unsigned idx,
  				      void (*callback)(struct virtqueue *vq),
  				      const char *name,
+				      u32 size,
  				      bool ctx,
  				      u16 msix_vec);
  	void (*del_vq)(struct virtio_pci_vq_info *info);
diff --git a/drivers/virtio/virtio_pci_legacy.c b/drivers/virtio/virtio_pci_legacy.c
index b68934fe6b5d..2c4ade5fb420 100644
--- a/drivers/virtio/virtio_pci_legacy.c
+++ b/drivers/virtio/virtio_pci_legacy.c
@@ -112,6 +112,7 @@ static struct virtqueue *setup_vq(struct virtio_pci_device *vp_dev,
  				  unsigned index,
  				  void (*callback)(struct virtqueue *vq),
  				  const char *name,
+				  u32 size,
  				  bool ctx,
  				  u16 msix_vec)
  {
@@ -125,10 +126,13 @@ static struct virtqueue *setup_vq(struct virtio_pci_device *vp_dev,
  	if (!num || vp_legacy_get_queue_enable(&vp_dev->ldev, index))
  		return ERR_PTR(-ENOENT);
+ if (!size || size > num)
+		size = num;
+
  	info->msix_vector = msix_vec;
/* create the vring */
-	vq = vring_create_virtqueue(index, num,
+	vq = vring_create_virtqueue(index, size,
  				    VIRTIO_PCI_VRING_ALIGN, &vp_dev->vdev,
  				    true, false, ctx,
  				    vp_notify, callback, name);
diff --git a/drivers/virtio/virtio_pci_modern.c b/drivers/virtio/virtio_pci_modern.c
index 3b35e5056165..a17c47d4435a 100644
--- a/drivers/virtio/virtio_pci_modern.c
+++ b/drivers/virtio/virtio_pci_modern.c
@@ -289,6 +289,7 @@ static struct virtqueue *setup_vq(struct virtio_pci_device *vp_dev,
  				  unsigned index,
  				  void (*callback)(struct virtqueue *vq),
  				  const char *name,
+				  u32 size,
  				  bool ctx,
  				  u16 msix_vec)
  {
@@ -306,15 +307,18 @@ static struct virtqueue *setup_vq(struct virtio_pci_device *vp_dev,
  	if (!num || vp_modern_get_queue_enable(mdev, index))
  		return ERR_PTR(-ENOENT);
- if (num & (num - 1)) {
-		dev_warn(&vp_dev->pci_dev->dev, "bad queue size %u", num);
+	if (!size || size > num)
+		size = num;
+
+	if (size & (size - 1)) {
+		dev_warn(&vp_dev->pci_dev->dev, "bad queue size %u", size);
  		return ERR_PTR(-EINVAL);
  	}
info->msix_vector = msix_vec; /* create the vring */
-	vq = vring_create_virtqueue(index, num,
+	vq = vring_create_virtqueue(index, size,
  				    SMP_CACHE_BYTES, &vp_dev->vdev,
  				    true, true, ctx,
  				    vp_notify, callback, name);




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