It seemed like a good idea, but it's actually a pain when we get more
than 32 feature bits. Just change it to a u32 for now.
Cc: Ohad Ben-Cohen <ohad@xxxxxxxxxx>
Cc: Brian Swetland <swetland@xxxxxxxxxx>
Cc: Cornelia Huck <cornelia.huck@xxxxxxxxxx>
Cc: Pawel Moll <pawel.moll@xxxxxxx>
Cc: Christian Borntraeger <borntraeger@xxxxxxxxxx>
Signed-off-by: Rusty Russell <rusty@xxxxxxxxxxxxxxx>
---
drivers/char/virtio_console.c | 2 +-
drivers/lguest/lguest_device.c | 2 +-
drivers/remoteproc/remoteproc_virtio.c | 2 +-
drivers/s390/kvm/kvm_virtio.c | 2 +-
drivers/virtio/virtio.c | 10 +++++-----
drivers/virtio/virtio_mmio.c | 8 ++------
drivers/virtio/virtio_pci.c | 3 +--
drivers/virtio/virtio_ring.c | 2 +-
include/linux/virtio.h | 3 +--
include/linux/virtio_config.h | 2 +-
tools/virtio/linux/virtio.h | 22 +---------------------
tools/virtio/linux/virtio_config.h | 2 +-
tools/virtio/virtio_test.c | 5 ++---
tools/virtio/vringh_test.c | 16 ++++++++--------
14 files changed, 27 insertions(+), 54 deletions(-)
diff --git a/drivers/char/virtio_console.c b/drivers/char/virtio_console.c
index 1735c38..9d9f717 100644
--- a/drivers/char/virtio_console.c
+++ b/drivers/char/virtio_console.c
@@ -351,7 +351,7 @@ static inline bool use_multiport(struct ports_device *portdev)
*/
if (!portdev->vdev)
return 0;
- return portdev->vdev->features[0] & (1 << VIRTIO_CONSOLE_F_MULTIPORT);
+ return portdev->vdev->features & (1 << VIRTIO_CONSOLE_F_MULTIPORT);
}
static DEFINE_SPINLOCK(dma_bufs_lock);
diff --git a/drivers/lguest/lguest_device.c b/drivers/lguest/lguest_device.c
index 8554d41..48bd2ad 100644
--- a/drivers/lguest/lguest_device.c
+++ b/drivers/lguest/lguest_device.c
@@ -144,7 +144,7 @@ static void lg_finalize_features(struct virtio_device *vdev)
memset(out_features, 0, desc->feature_len);
bits = min_t(unsigned, desc->feature_len, sizeof(vdev->features)) * 8;
for (i = 0; i < bits; i++) {
- if (test_bit(i, vdev->features))
+ if (vdev->features & (1 << i))
out_features[i / 8] |= (1 << (i % 8));
}
diff --git a/drivers/remoteproc/remoteproc_virtio.c b/drivers/remoteproc/remoteproc_virtio.c
index afed9b7..fb8faee 100644
--- a/drivers/remoteproc/remoteproc_virtio.c
+++ b/drivers/remoteproc/remoteproc_virtio.c
@@ -219,7 +219,7 @@ static void rproc_virtio_finalize_features(struct virtio_device *vdev)
* fixed as part of a small resource table overhaul and then an
* extension of the virtio resource entries.
*/
- rvdev->gfeatures = vdev->features[0];
+ rvdev->gfeatures = vdev->features;
}
static const struct virtio_config_ops rproc_virtio_config_ops = {
diff --git a/drivers/s390/kvm/kvm_virtio.c b/drivers/s390/kvm/kvm_virtio.c
index dcf35b1..2553319 100644
--- a/drivers/s390/kvm/kvm_virtio.c
+++ b/drivers/s390/kvm/kvm_virtio.c
@@ -106,7 +106,7 @@ static void kvm_finalize_features(struct virtio_device *vdev)
memset(out_features, 0, desc->feature_len);
bits = min_t(unsigned, desc->feature_len, sizeof(vdev->features)) * 8;
for (i = 0; i < bits; i++) {
- if (test_bit(i, vdev->features))
+ if (vdev->features & (1 << i))
out_features[i / 8] |= (1 << (i % 8));
}
}
diff --git a/drivers/virtio/virtio.c b/drivers/virtio/virtio.c
index ee59b74..dd33d84 100644
--- a/drivers/virtio/virtio.c
+++ b/drivers/virtio/virtio.c
@@ -41,9 +41,9 @@ 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');
+ dev->features & (1ULL << i) ? '1' : '0');
len += sprintf(buf+len, "\n");
return len;
}
@@ -120,18 +120,18 @@ 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);
+ dev->features |= (1 << 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);
+ dev->features |= (1 << i);
dev->config->finalize_features(dev);
diff --git a/drivers/virtio/virtio_mmio.c b/drivers/virtio/virtio_mmio.c
index ad7f38f..d933150 100644
--- a/drivers/virtio/virtio_mmio.c
+++ b/drivers/virtio/virtio_mmio.c
@@ -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,
diff --git a/drivers/virtio/virtio_pci.c b/drivers/virtio/virtio_pci.c
index 96a988b..55bd65f 100644
--- a/drivers/virtio/virtio_pci.c
+++ b/drivers/virtio/virtio_pci.c
@@ -123,8 +123,7 @@ 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);
}
/* Device config access: we use guest endian, as per spec. */
diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
index 5217baf..82afdd8 100644
--- a/drivers/virtio/virtio_ring.c
+++ b/drivers/virtio/virtio_ring.c
@@ -814,7 +814,7 @@ void vring_transport_features(struct virtio_device *vdev)
break;
default:
/* We don't understand this bit. */
- clear_bit(i, vdev->features);
+ vdev->features &= ~(1 << i);
}
}
}
diff --git a/include/linux/virtio.h b/include/linux/virtio.h
index 833f17b..80f55a0 100644
--- a/include/linux/virtio.h
+++ b/include/linux/virtio.h
@@ -100,8 +100,7 @@ struct virtio_device {
const struct virtio_config_ops *config;
const struct vringh_config_ops *vringh_config;
struct list_head vqs;
- /* Note that this is a Linux set_bit-style bitmap. */
- unsigned long features[1];
+ u32 features;
void *priv;
};
diff --git a/include/linux/virtio_config.h b/include/linux/virtio_config.h
index 73841ee..c250625 100644
--- a/include/linux/virtio_config.h
+++ b/include/linux/virtio_config.h
@@ -111,7 +111,7 @@ static inline bool virtio_has_feature(const struct virtio_device *vdev,
if (fbit < VIRTIO_TRANSPORT_F_START)
virtio_check_driver_offered_feature(vdev, fbit);
- return test_bit(fbit, vdev->features);
+ return vdev->features & (1 << fbit);
}
static inline
diff --git a/tools/virtio/linux/virtio.h b/tools/virtio/linux/virtio.h
index 6df181a..02a38e8 100644
--- a/tools/virtio/linux/virtio.h
+++ b/tools/virtio/linux/virtio.h
@@ -6,31 +6,11 @@
/* TODO: empty stubs for now. Broken but enough for virtio_ring.c */
#define list_add_tail(a, b) do {} while (0)
#define list_del(a) do {} while (0)
-
-#define BIT_WORD(nr) ((nr) / BITS_PER_LONG)
-#define BITS_PER_BYTE 8
-#define BITS_PER_LONG (sizeof(long) * BITS_PER_BYTE)
-#define BIT_MASK(nr) (1UL << ((nr) % BITS_PER_LONG))
-
-/* TODO: Not atomic as it should be:
- * we don't use this for anything important. */
-static inline void clear_bit(int nr, volatile unsigned long *addr)
-{
- unsigned long mask = BIT_MASK(nr);
- unsigned long *p = ((unsigned long *)addr) + BIT_WORD(nr);
-
- *p &= ~mask;
-}
-
-static inline int test_bit(int nr, const volatile unsigned long *addr)
-{
- return 1UL & (addr[BIT_WORD(nr)] >> (nr & (BITS_PER_LONG-1)));
-}
/* end of stubs */
struct virtio_device {
void *dev;
- unsigned long features[1];
+ u32 features;
};
struct virtqueue {
diff --git a/tools/virtio/linux/virtio_config.h b/tools/virtio/linux/virtio_config.h
index 5049967..1f1636b 100644
--- a/tools/virtio/linux/virtio_config.h
+++ b/tools/virtio/linux/virtio_config.h
@@ -2,5 +2,5 @@
#define VIRTIO_TRANSPORT_F_END 32
#define virtio_has_feature(dev, feature) \
- test_bit((feature), (dev)->features)
+ ((dev)->features & (1 << feature))
diff --git a/tools/virtio/virtio_test.c b/tools/virtio/virtio_test.c
index 814ae80..59f0706 100644
--- a/tools/virtio/virtio_test.c
+++ b/tools/virtio/virtio_test.c
@@ -59,7 +59,7 @@ void vhost_vq_setup(struct vdev_info *dev, struct vq_info *info)
{
struct vhost_vring_state state = { .index = info->idx };
struct vhost_vring_file file = { .index = info->idx };
- unsigned long long features = dev->vdev.features[0];
+ unsigned long long features = dev->vdev.features;
struct vhost_vring_addr addr = {
.index = info->idx,
.desc_user_addr = (uint64_t)(unsigned long)info->vring.desc,
@@ -112,8 +112,7 @@ static void vdev_info_init(struct vdev_info* dev, unsigned long long features)
{
int r;
memset(dev, 0, sizeof *dev);
- dev->vdev.features[0] = features;
- dev->vdev.features[1] = features >> 32;
+ dev->vdev.features = features;
dev->buf_size = 1024;
dev->buf = malloc(dev->buf_size);
assert(dev->buf);
diff --git a/tools/virtio/vringh_test.c b/tools/virtio/vringh_test.c
index 88fe02a..d71fc05 100644
--- a/tools/virtio/vringh_test.c
+++ b/tools/virtio/vringh_test.c
@@ -299,7 +299,7 @@ static int parallel_test(unsigned long features,
close(to_guest[1]);
close(to_host[0]);
- gvdev.vdev.features[0] = features;
+ gvdev.vdev.features = features;
gvdev.to_host_fd = to_host[1];
gvdev.notifies = 0;
@@ -444,13 +444,13 @@ int main(int argc, char *argv[])
bool fast_vringh = false, parallel = false;
getrange = getrange_iov;
- vdev.features[0] = 0;
+ vdev.features = 0;
while (argv[1]) {
if (strcmp(argv[1], "--indirect") == 0)
- vdev.features[0] |= (1 << VIRTIO_RING_F_INDIRECT_DESC);
+ vdev.features |= (1 << VIRTIO_RING_F_INDIRECT_DESC);
else if (strcmp(argv[1], "--eventidx") == 0)
- vdev.features[0] |= (1 << VIRTIO_RING_F_EVENT_IDX);
+ vdev.features |= (1 << VIRTIO_RING_F_EVENT_IDX);
else if (strcmp(argv[1], "--slow-range") == 0)
getrange = getrange_slow;
else if (strcmp(argv[1], "--fast-vringh") == 0)
@@ -463,7 +463,7 @@ int main(int argc, char *argv[])
}
if (parallel)
- return parallel_test(vdev.features[0], getrange, fast_vringh);
+ return parallel_test(vdev.features, getrange, fast_vringh);
if (posix_memalign(&__user_addr_min, PAGE_SIZE, USER_MEM) != 0)
abort();
@@ -478,7 +478,7 @@ int main(int argc, char *argv[])
/* Set up host side. */
vring_init(&vrh.vring, RINGSIZE, __user_addr_min, ALIGN);
- vringh_init_user(&vrh, vdev.features[0], RINGSIZE, true,
+ vringh_init_user(&vrh, vdev.features, RINGSIZE, true,
vrh.vring.desc, vrh.vring.avail, vrh.vring.used);
/* No descriptor to get yet... */
@@ -646,13 +646,13 @@ int main(int argc, char *argv[])
}
/* Test weird (but legal!) indirect. */
- if (vdev.features[0] & (1 << VIRTIO_RING_F_INDIRECT_DESC)) {
+ if (vdev.features & (1 << VIRTIO_RING_F_INDIRECT_DESC)) {
char *data = __user_addr_max - USER_MEM/4;
struct vring_desc *d = __user_addr_max - USER_MEM/2;
struct vring vring;
/* Force creation of direct, which we modify. */
- vdev.features[0] &= ~(1 << VIRTIO_RING_F_INDIRECT_DESC);
+ vdev.features &= ~(1 << VIRTIO_RING_F_INDIRECT_DESC);
vq = vring_new_virtqueue(0, RINGSIZE, ALIGN, &vdev, true,
__user_addr_min,
never_notify_host,
--
1.7.10.4
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