diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/virtio/virtio_pci_common.h | 3 | ||||
| -rw-r--r-- | drivers/virtio/virtio_pci_modern.c | 57 |
2 files changed, 52 insertions, 8 deletions
diff --git a/drivers/virtio/virtio_pci_common.h b/drivers/virtio/virtio_pci_common.h index 610c43f..d391805 100644 --- a/drivers/virtio/virtio_pci_common.h +++ b/drivers/virtio/virtio_pci_common.h @@ -62,8 +62,11 @@ struct virtio_pci_device { struct virtio_pci_common_cfg __iomem *common; /* Device-specific data (non-legacy mode) */ void __iomem *device; + /* Base of vq notifications (non-legacy mode). */ + void __iomem *notify_base; /* So we can sanity-check accesses. */ + size_t notify_len; size_t device_len; /* Capability for when we need to map notifications per-vq. */ diff --git a/drivers/virtio/virtio_pci_modern.c b/drivers/virtio/virtio_pci_modern.c index b2e707ad..0e54cc8 100644 --- a/drivers/virtio/virtio_pci_modern.c +++ b/drivers/virtio/virtio_pci_modern.c @@ -330,10 +330,26 @@ static struct virtqueue *setup_vq(struct virtio_pci_device *vp_dev, iowrite64_twopart(virt_to_phys(virtqueue_get_used(vq)), &cfg->queue_used_lo, &cfg->queue_used_hi); - vq->priv = (void __force *)map_capability(vp_dev->pci_dev, - vp_dev->notify_map_cap, 2, 2, - off * vp_dev->notify_offset_multiplier, 2, - NULL); + if (vp_dev->notify_base) { + /* offset should not wrap */ + if ((u64)off * vp_dev->notify_offset_multiplier + 2 + > vp_dev->notify_len) { + dev_warn(&vp_dev->pci_dev->dev, + "bad notification offset %u (x %u) " + "for queue %u > %zd", + off, vp_dev->notify_offset_multiplier, + index, vp_dev->notify_len); + err = -EINVAL; + goto err_map_notify; + } + vq->priv = (void __force *)vp_dev->notify_base + + off * vp_dev->notify_offset_multiplier; + } else { + vq->priv = (void __force *)map_capability(vp_dev->pci_dev, + vp_dev->notify_map_cap, 2, 2, + off * vp_dev->notify_offset_multiplier, 2, + NULL); + } if (!vq->priv) { err = -ENOMEM; @@ -352,7 +368,8 @@ static struct virtqueue *setup_vq(struct virtio_pci_device *vp_dev, return vq; err_assign_vector: - pci_iounmap(vp_dev->pci_dev, (void __iomem __force *)vq->priv); + if (!vp_dev->notify_base) + pci_iounmap(vp_dev->pci_dev, (void __iomem __force *)vq->priv); err_map_notify: vring_del_virtqueue(vq); err_new_queue: @@ -397,7 +414,8 @@ static void del_vq(struct virtio_pci_vq_info *info) ioread16(&vp_dev->common->queue_msix_vector); } - pci_iounmap(vp_dev->pci_dev, (void __force __iomem *)vq->priv); + if (!vp_dev->notify_base) + pci_iounmap(vp_dev->pci_dev, (void __force __iomem *)vq->priv); vring_del_virtqueue(vq); @@ -533,6 +551,7 @@ int virtio_pci_modern_probe(struct virtio_pci_device *vp_dev) struct pci_dev *pci_dev = vp_dev->pci_dev; int err, common, isr, notify, device; u32 notify_length; + u32 notify_offset; check_offsets(); @@ -599,13 +618,30 @@ int virtio_pci_modern_probe(struct virtio_pci_device *vp_dev) notify + offsetof(struct virtio_pci_notify_cap, notify_off_multiplier), &vp_dev->notify_offset_multiplier); - /* Read notify length from config space. */ + /* Read notify length and offset from config space. */ pci_read_config_dword(pci_dev, notify + offsetof(struct virtio_pci_notify_cap, cap.length), ¬ify_length); - vp_dev->notify_map_cap = notify; + pci_read_config_dword(pci_dev, + notify + offsetof(struct virtio_pci_notify_cap, + cap.length), + ¬ify_offset); + + /* We don't know how many VQs we'll map, ahead of the time. + * If notify length is small, map it all now. + * Otherwise, map each VQ individually later. + */ + if ((u64)notify_length + (notify_offset % PAGE_SIZE) <= PAGE_SIZE) { + vp_dev->notify_base = map_capability(pci_dev, notify, 2, 2, + 0, notify_length, + &vp_dev->notify_len); + if (!vp_dev->notify_base) + goto err_map_notify; + } else { + vp_dev->notify_map_cap = notify; + } /* Again, we don't know how much we should map, but PAGE_SIZE * is more than enough for all existing devices. @@ -627,6 +663,9 @@ int virtio_pci_modern_probe(struct virtio_pci_device *vp_dev) return 0; err_map_device: + if (vp_dev->notify_base) + pci_iounmap(pci_dev, vp_dev->notify_base); +err_map_notify: pci_iounmap(pci_dev, vp_dev->isr); err_map_isr: pci_iounmap(pci_dev, vp_dev->common); @@ -640,6 +679,8 @@ void virtio_pci_modern_remove(struct virtio_pci_device *vp_dev) if (vp_dev->device) pci_iounmap(pci_dev, vp_dev->device); + if (vp_dev->notify_base) + pci_iounmap(pci_dev, vp_dev->notify_base); pci_iounmap(pci_dev, vp_dev->isr); pci_iounmap(pci_dev, vp_dev->common); } |
