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virtio-pci: do not access iomem via struct virtio_pci_device directly 

Instead of accessing iomem via struct virito_pci_device directly,
tweak to call the io accessors through the iomem structure. This will
ease the splitting of modern virtio device logic.

Signed-off-by: Jason Wang <jasowang@redhat.com>
Link: https://lore.kernel.org/r/20210104065503.199631-2-jasowang@redhat.com
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Jason Wang 2021-01-04 14:54:45 +08:00 committed by Michael S. Tsirkin
parent 489084dd3f
commit 64f2087aaa
1 changed files with 46 additions and 30 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

76
drivers/virtio/virtio_pci_modern.c
View File

@ -141,12 +141,13 @@ static void __iomem *map_capability(struct pci_dev *dev, int off,
static u64 vp_get_features(struct virtio_device *vdev)
{
struct virtio_pci_device *vp_dev = to_vp_device(vdev);
struct virtio_pci_common_cfg __iomem *cfg = vp_dev->common;
u64 features;
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);
vp_iowrite32(0, &cfg->device_feature_select);
features = vp_ioread32(&cfg->device_feature);
vp_iowrite32(1, &cfg->device_feature_select);
features |= ((u64)vp_ioread32(&cfg->device_feature) << 32);
return features;
}
@ -165,6 +166,7 @@ static void vp_transport_features(struct virtio_device *vdev, u64 features)
static int vp_finalize_features(struct virtio_device *vdev)
{
struct virtio_pci_device *vp_dev = to_vp_device(vdev);
struct virtio_pci_common_cfg __iomem *cfg = vp_dev->common;
u64 features = vdev->features;
/* Give virtio_ring a chance to accept features. */
@ -179,10 +181,10 @@ static int vp_finalize_features(struct virtio_device *vdev)
return -EINVAL;
}
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);
vp_iowrite32(0, &cfg->guest_feature_select);
vp_iowrite32((u32)vdev->features, &cfg->guest_feature);
vp_iowrite32(1, &cfg->guest_feature_select);
vp_iowrite32(vdev->features >> 32, &cfg->guest_feature);
return 0;
}
@ -192,6 +194,7 @@ static void vp_get(struct virtio_device *vdev, unsigned offset,
void *buf, unsigned len)
{
struct virtio_pci_device *vp_dev = to_vp_device(vdev);
void __iomem *device = vp_dev->device;
u8 b;
__le16 w;
__le32 l;
@ -200,21 +203,21 @@ static void vp_get(struct virtio_device *vdev, unsigned offset,
switch (len) {
case 1:
b = ioread8(vp_dev->device + offset);
b = ioread8(device + offset);
memcpy(buf, &b, sizeof b);
break;
case 2:
w = cpu_to_le16(ioread16(vp_dev->device + offset));
w = cpu_to_le16(ioread16(device + offset));
memcpy(buf, &w, sizeof w);
break;
case 4:
l = cpu_to_le32(ioread32(vp_dev->device + offset));
l = cpu_to_le32(ioread32(device + offset));
memcpy(buf, &l, sizeof l);
break;
case 8:
l = cpu_to_le32(ioread32(vp_dev->device + offset));
l = cpu_to_le32(ioread32(device + offset));
memcpy(buf, &l, sizeof l);
l = cpu_to_le32(ioread32(vp_dev->device + offset + sizeof l));
l = cpu_to_le32(ioread32(device + offset + sizeof l));
memcpy(buf + sizeof l, &l, sizeof l);
break;
default:
@ -228,6 +231,7 @@ static void vp_set(struct virtio_device *vdev, unsigned offset,
const void *buf, unsigned len)
{
struct virtio_pci_device *vp_dev = to_vp_device(vdev);
void __iomem *device = vp_dev->device;
u8 b;
__le16 w;
__le32 l;
@ -237,21 +241,21 @@ static void vp_set(struct virtio_device *vdev, unsigned offset,
switch (len) {
case 1:
memcpy(&b, buf, sizeof b);
iowrite8(b, vp_dev->device + offset);
iowrite8(b, device + offset);
break;
case 2:
memcpy(&w, buf, sizeof w);
iowrite16(le16_to_cpu(w), vp_dev->device + offset);
iowrite16(le16_to_cpu(w), device + offset);
break;
case 4:
memcpy(&l, buf, sizeof l);
iowrite32(le32_to_cpu(l), vp_dev->device + offset);
iowrite32(le32_to_cpu(l), device + offset);
break;
case 8:
memcpy(&l, buf, sizeof l);
iowrite32(le32_to_cpu(l), vp_dev->device + offset);
iowrite32(le32_to_cpu(l), device + offset);
memcpy(&l, buf + sizeof l, sizeof l);
iowrite32(le32_to_cpu(l), vp_dev->device + offset + sizeof l);
iowrite32(le32_to_cpu(l), device + offset + sizeof l);
break;
default:
BUG();
@ -261,35 +265,43 @@ 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 vp_ioread8(&vp_dev->common->config_generation);
struct virtio_pci_common_cfg __iomem *cfg = vp_dev->common;
return vp_ioread8(&cfg->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 vp_ioread8(&vp_dev->common->device_status);
struct virtio_pci_common_cfg __iomem *cfg = vp_dev->common;
return vp_ioread8(&cfg->device_status);
}
static void vp_set_status(struct virtio_device *vdev, u8 status)
{
struct virtio_pci_device *vp_dev = to_vp_device(vdev);
struct virtio_pci_common_cfg __iomem *cfg = vp_dev->common;
/* We should never be setting status to 0. */
BUG_ON(status == 0);
vp_iowrite8(status, &vp_dev->common->device_status);
vp_iowrite8(status, &cfg->device_status);
}
static void vp_reset(struct virtio_device *vdev)
{
struct virtio_pci_device *vp_dev = to_vp_device(vdev);
struct virtio_pci_common_cfg __iomem *cfg = vp_dev->common;
/* 0 status means a reset. */
vp_iowrite8(0, &vp_dev->common->device_status);
vp_iowrite8(0, &cfg->device_status);
/* After writing 0 to device_status, the driver MUST wait for a read of
* device_status to return 0 before reinitializing the device.
* This will flush out the status write, and flush in device writes,
* including MSI-X interrupts, if any.
*/
while (vp_ioread8(&vp_dev->common->device_status))
while (vp_ioread8(&cfg->device_status))
msleep(1);
/* Flush pending VQ/configuration callbacks. */
vp_synchronize_vectors(vdev);
@ -297,11 +309,13 @@ static void vp_reset(struct virtio_device *vdev)
static u16 vp_config_vector(struct virtio_pci_device *vp_dev, u16 vector)
{
struct virtio_pci_common_cfg __iomem *cfg = vp_dev->common;
/* Setup the vector used for configuration events */
vp_iowrite16(vector, &vp_dev->common->msix_config);
vp_iowrite16(vector, &cfg->msix_config);
/* Verify we had enough resources to assign the vector */
/* Will also flush the write out to device */
return vp_ioread16(&vp_dev->common->msix_config);
return vp_ioread16(&cfg->msix_config);
}
static struct virtqueue *setup_vq(struct virtio_pci_device *vp_dev,
@ -407,6 +421,7 @@ static int vp_modern_find_vqs(struct virtio_device *vdev, unsigned nvqs,
struct irq_affinity *desc)
{
struct virtio_pci_device *vp_dev = to_vp_device(vdev);
struct virtio_pci_common_cfg __iomem *cfg = vp_dev->common;
struct virtqueue *vq;
int rc = vp_find_vqs(vdev, nvqs, vqs, callbacks, names, ctx, desc);
@ -417,8 +432,8 @@ 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) {
vp_iowrite16(vq->index, &vp_dev->common->queue_select);
vp_iowrite16(1, &vp_dev->common->queue_enable);
vp_iowrite16(vq->index, &cfg->queue_select);
vp_iowrite16(1, &cfg->queue_enable);
}
return 0;
@ -428,14 +443,15 @@ 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);
struct virtio_pci_common_cfg __iomem *cfg = vp_dev->common;
vp_iowrite16(vq->index, &vp_dev->common->queue_select);
vp_iowrite16(vq->index, &cfg->queue_select);
if (vp_dev->msix_enabled) {
vp_iowrite16(VIRTIO_MSI_NO_VECTOR,
&vp_dev->common->queue_msix_vector);
&cfg->queue_msix_vector);
/* Flush the write out to device */
vp_ioread16(&vp_dev->common->queue_msix_vector);
vp_ioread16(&cfg->queue_msix_vector);
}
if (!vp_dev->notify_base)