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virtio_pci_modern: switch to type-safe io accessors 

As Rusty noted, we were accessing queue_enable with an incorrect width.
Switch to type-safe accessors so we don't make this mistake again in the
future.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Michael S. Tsirkin 2015-04-01 14:43:15 +10:30 committed by Rusty Russell
parent c5d4c2c9ce
commit a8557d32fe
1 changed files with 42 additions and 41 deletions
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83
drivers/virtio/virtio_pci_modern.c
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@ -57,6 +57,13 @@ static inline void vp_iowrite32(u32 value, u32 __iomem *addr)
iowrite32(value, addr);
}
static void vp_iowrite64_twopart(u64 val,
__le32 __iomem *lo, __le32 __iomem *hi)
{
vp_iowrite32((u32)val, lo);
vp_iowrite32(val >> 32, hi);
}
static void __iomem *map_capability(struct pci_dev *dev, int off,
size_t minlen,
u32 align,
@ -131,22 +138,16 @@ static void __iomem *map_capability(struct pci_dev *dev, int off,
return p;
}
static void iowrite64_twopart(u64 val, __le32 __iomem *lo, __le32 __iomem *hi)
{
iowrite32((u32)val, lo);
iowrite32(val >> 32, hi);
}
/* virtio config->get_features() implementation */
static u64 vp_get_features(struct virtio_device *vdev)
{
struct virtio_pci_device *vp_dev = to_vp_device(vdev);
u64 features;
iowrite32(0, &vp_dev->common->device_feature_select);
features = ioread32(&vp_dev->common->device_feature);
iowrite32(1, &vp_dev->common->device_feature_select);
features |= ((u64)ioread32(&vp_dev->common->device_feature) << 32);
vp_iowrite32(0, &vp_dev->common->device_feature_select);
features = vp_ioread32(&vp_dev->common->device_feature);
vp_iowrite32(1, &vp_dev->common->device_feature_select);
features |= ((u64)vp_ioread32(&vp_dev->common->device_feature) << 32);
return features;
}
@ -165,10 +166,10 @@ static int vp_finalize_features(struct virtio_device *vdev)
return -EINVAL;
}
iowrite32(0, &vp_dev->common->guest_feature_select);
iowrite32((u32)vdev->features, &vp_dev->common->guest_feature);
iowrite32(1, &vp_dev->common->guest_feature_select);
iowrite32(vdev->features >> 32, &vp_dev->common->guest_feature);
vp_iowrite32(0, &vp_dev->common->guest_feature_select);
vp_iowrite32((u32)vdev->features, &vp_dev->common->guest_feature);
vp_iowrite32(1, &vp_dev->common->guest_feature_select);
vp_iowrite32(vdev->features >> 32, &vp_dev->common->guest_feature);
return 0;
}
@ -247,14 +248,14 @@ static void vp_set(struct virtio_device *vdev, unsigned offset,
static u32 vp_generation(struct virtio_device *vdev)
{
struct virtio_pci_device *vp_dev = to_vp_device(vdev);
return ioread8(&vp_dev->common->config_generation);
return vp_ioread8(&vp_dev->common->config_generation);
}
/* config->{get,set}_status() implementations */
static u8 vp_get_status(struct virtio_device *vdev)
{
struct virtio_pci_device *vp_dev = to_vp_device(vdev);
return ioread8(&vp_dev->common->device_status);
return vp_ioread8(&vp_dev->common->device_status);
}
static void vp_set_status(struct virtio_device *vdev, u8 status)
@ -262,17 +263,17 @@ static void vp_set_status(struct virtio_device *vdev, u8 status)
struct virtio_pci_device *vp_dev = to_vp_device(vdev);
/* We should never be setting status to 0. */
BUG_ON(status == 0);
iowrite8(status, &vp_dev->common->device_status);
vp_iowrite8(status, &vp_dev->common->device_status);
}
static void vp_reset(struct virtio_device *vdev)
{
struct virtio_pci_device *vp_dev = to_vp_device(vdev);
/* 0 status means a reset. */
iowrite8(0, &vp_dev->common->device_status);
vp_iowrite8(0, &vp_dev->common->device_status);
/* Flush out the status write, and flush in device writes,
* including MSI-X interrupts, if any. */
ioread8(&vp_dev->common->device_status);
vp_ioread8(&vp_dev->common->device_status);
/* Flush pending VQ/configuration callbacks. */
vp_synchronize_vectors(vdev);
}
@ -280,10 +281,10 @@ static void vp_reset(struct virtio_device *vdev)
static u16 vp_config_vector(struct virtio_pci_device *vp_dev, u16 vector)
{
/* Setup the vector used for configuration events */
iowrite16(vector, &vp_dev->common->msix_config);
vp_iowrite16(vector, &vp_dev->common->msix_config);
/* Verify we had enough resources to assign the vector */
/* Will also flush the write out to device */
return ioread16(&vp_dev->common->msix_config);
return vp_ioread16(&vp_dev->common->msix_config);
}
static size_t vring_pci_size(u16 num)
@ -323,15 +324,15 @@ static struct virtqueue *setup_vq(struct virtio_pci_device *vp_dev,
u16 num, off;
int err;
if (index >= ioread16(&cfg->num_queues))
if (index >= vp_ioread16(&cfg->num_queues))
return ERR_PTR(-ENOENT);
/* Select the queue we're interested in */
iowrite16(index, &cfg->queue_select);
vp_iowrite16(index, &cfg->queue_select);
/* Check if queue is either not available or already active. */
num = ioread16(&cfg->queue_size);
if (!num || ioread16(&cfg->queue_enable))
num = vp_ioread16(&cfg->queue_size);
if (!num || vp_ioread16(&cfg->queue_enable))
return ERR_PTR(-ENOENT);
if (num & (num - 1)) {
@ -340,7 +341,7 @@ static struct virtqueue *setup_vq(struct virtio_pci_device *vp_dev,
}
/* get offset of notification word for this vq */
off = ioread16(&cfg->queue_notify_off);
off = vp_ioread16(&cfg->queue_notify_off);
info->num = num;
info->msix_vector = msix_vec;
@ -359,13 +360,13 @@ static struct virtqueue *setup_vq(struct virtio_pci_device *vp_dev,
}
/* activate the queue */
iowrite16(num, &cfg->queue_size);
iowrite64_twopart(virt_to_phys(info->queue),
&cfg->queue_desc_lo, &cfg->queue_desc_hi);
iowrite64_twopart(virt_to_phys(virtqueue_get_avail(vq)),
&cfg->queue_avail_lo, &cfg->queue_avail_hi);
iowrite64_twopart(virt_to_phys(virtqueue_get_used(vq)),
&cfg->queue_used_lo, &cfg->queue_used_hi);
vp_iowrite16(num, &cfg->queue_size);
vp_iowrite64_twopart(virt_to_phys(info->queue),
&cfg->queue_desc_lo, &cfg->queue_desc_hi);
vp_iowrite64_twopart(virt_to_phys(virtqueue_get_avail(vq)),
&cfg->queue_avail_lo, &cfg->queue_avail_hi);
vp_iowrite64_twopart(virt_to_phys(virtqueue_get_used(vq)),
&cfg->queue_used_lo, &cfg->queue_used_hi);
if (vp_dev->notify_base) {
/* offset should not wrap */
@ -394,8 +395,8 @@ static struct virtqueue *setup_vq(struct virtio_pci_device *vp_dev,
}
if (msix_vec != VIRTIO_MSI_NO_VECTOR) {
iowrite16(msix_vec, &cfg->queue_msix_vector);
msix_vec = ioread16(&cfg->queue_msix_vector);
vp_iowrite16(msix_vec, &cfg->queue_msix_vector);
msix_vec = vp_ioread16(&cfg->queue_msix_vector);
if (msix_vec == VIRTIO_MSI_NO_VECTOR) {
err = -EBUSY;
goto err_assign_vector;
@ -430,8 +431,8 @@ static int vp_modern_find_vqs(struct virtio_device *vdev, unsigned nvqs,
* this, there's no way to go back except reset.
*/
list_for_each_entry(vq, &vdev->vqs, list) {
iowrite16(vq->index, &vp_dev->common->queue_select);
iowrite16(1, &vp_dev->common->queue_enable);
vp_iowrite16(vq->index, &vp_dev->common->queue_select);
vp_iowrite16(1, &vp_dev->common->queue_enable);
}
return 0;
@ -442,13 +443,13 @@ static void del_vq(struct virtio_pci_vq_info *info)
struct virtqueue *vq = info->vq;
struct virtio_pci_device *vp_dev = to_vp_device(vq->vdev);
iowrite16(vq->index, &vp_dev->common->queue_select);
vp_iowrite16(vq->index, &vp_dev->common->queue_select);
if (vp_dev->msix_enabled) {
iowrite16(VIRTIO_MSI_NO_VECTOR,
&vp_dev->common->queue_msix_vector);
vp_iowrite16(VIRTIO_MSI_NO_VECTOR,
&vp_dev->common->queue_msix_vector);
/* Flush the write out to device */
ioread16(&vp_dev->common->queue_msix_vector);
vp_ioread16(&vp_dev->common->queue_msix_vector);
}
if (!vp_dev->notify_base)