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virtio: use u32, not bitmap for features

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It seemed like a good idea to use bitmap for features
in struct virtio_device, but it's actually a pain,
and seems to become even more painful when we get more
than 32 feature bits.  Just change it to a u32 for now.

Based on patch by Rusty.

Suggested-by: David Hildenbrand <[email protected]>
Signed-off-by: Rusty Russell <[email protected]>
Signed-off-by: Cornelia Huck <[email protected]>
Signed-off-by: Michael S. Tsirkin <[email protected]>
Reviewed-by: Cornelia Huck <[email protected]>
This commit is contained in:
Michael S. Tsirkin 2014-10-07 16:39:42 +02:00
commit e16e12be34
16 changed files with 42 additions and 74 deletions
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10
drivers/virtio/virtio.c
View file

@ -49,9 +49,9 @@ static ssize_t features_show(struct device *_d,
/* We actually represent this as a bitstring, as it could be
* arbitrary length in future. */
for (i = 0; i < ARRAY_SIZE(dev->features)*BITS_PER_LONG; i++)
for (i = 0; i < sizeof(dev->features)*8; i++)
len += sprintf(buf+len, "%c",
test_bit(i, dev->features) ? '1' : '0');
__virtio_test_bit(dev, i) ? '1' : '0');
len += sprintf(buf+len, "\n");
return len;
}
@ -168,18 +168,18 @@ static int virtio_dev_probe(struct device *_d)
device_features = dev->config->get_features(dev);
/* Features supported by both device and driver into dev->features. */
memset(dev->features, 0, sizeof(dev->features));
dev->features = 0;
for (i = 0; i < drv->feature_table_size; i++) {
unsigned int f = drv->feature_table[i];
BUG_ON(f >= 32);
if (device_features & (1 << f))
set_bit(f, dev->features);
__virtio_set_bit(dev, f);
}
/* Transport features always preserved to pass to finalize_features. */
for (i = VIRTIO_TRANSPORT_F_START; i < VIRTIO_TRANSPORT_F_END; i++)
if (device_features & (1 << i))
set_bit(i, dev->features);
__virtio_set_bit(dev, i);
dev->config->finalize_features(dev);

8
drivers/virtio/virtio_mmio.c
View file

@ -155,16 +155,12 @@ static u32 vm_get_features(struct virtio_device *vdev)
static void vm_finalize_features(struct virtio_device *vdev)
{
struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev);
int i;
/* Give virtio_ring a chance to accept features. */
vring_transport_features(vdev);
for (i = 0; i < ARRAY_SIZE(vdev->features); i++) {
writel(i, vm_dev->base + VIRTIO_MMIO_GUEST_FEATURES_SEL);
writel(vdev->features[i],
vm_dev->base + VIRTIO_MMIO_GUEST_FEATURES);
}
writel(0, vm_dev->base + VIRTIO_MMIO_GUEST_FEATURES_SEL);
writel(vdev->features, vm_dev->base + VIRTIO_MMIO_GUEST_FEATURES);
}
static void vm_get(struct virtio_device *vdev, unsigned offset,

3
drivers/virtio/virtio_pci.c
View file

@ -120,8 +120,7 @@ static void vp_finalize_features(struct virtio_device *vdev)
vring_transport_features(vdev);
/* We only support 32 feature bits. */
BUILD_BUG_ON(ARRAY_SIZE(vdev->features) != 1);
iowrite32(vdev->features[0], vp_dev->ioaddr+VIRTIO_PCI_GUEST_FEATURES);
iowrite32(vdev->features, vp_dev->ioaddr + VIRTIO_PCI_GUEST_FEATURES);
}
/* virtio config->get() implementation */

2
drivers/virtio/virtio_ring.c
View file

@ -781,7 +781,7 @@ void vring_transport_features(struct virtio_device *vdev)
break;
default:
/* We don't understand this bit. */
clear_bit(i, vdev->features);
__virtio_clear_bit(vdev, i);
}
}
}