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authorMichael S. Tsirkin <mst@redhat.com>2014-10-07 16:39:42 +0200
committerMichael S. Tsirkin <mst@redhat.com>2014-12-09 12:05:23 +0200
commite16e12be34648777606a2c03a3526409b38f0e63 (patch)
tree36298911ba8eed0a4805c2c30a56d92520d23432 /tools/virtio
parentvirtio: add low-level APIs for feature bits (diff)
downloadlinux-dev-e16e12be34648777606a2c03a3526409b38f0e63.tar.xz
linux-dev-e16e12be34648777606a2c03a3526409b38f0e63.zip
virtio: use u32, not bitmap for features
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 <dahi@linux.vnet.ibm.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Diffstat (limited to 'tools/virtio')
-rw-r--r--tools/virtio/linux/virtio.h22
-rw-r--r--tools/virtio/linux/virtio_config.h2
-rw-r--r--tools/virtio/virtio_test.c5
-rw-r--r--tools/virtio/vringh_test.c16
4 files changed, 12 insertions, 33 deletions
diff --git a/tools/virtio/linux/virtio.h b/tools/virtio/linux/virtio.h
index 5a2d1f0f6bc7..72bff70bfeeb 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 5049967f99f7..83b27e8e9d72 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)
+ (__virtio_test_bit((dev), feature))
diff --git a/tools/virtio/virtio_test.c b/tools/virtio/virtio_test.c
index 00ea679b3826..db3437c641a6 100644
--- a/tools/virtio/virtio_test.c
+++ b/tools/virtio/virtio_test.c
@@ -60,7 +60,7 @@ 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,
@@ -113,8 +113,7 @@ 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 14a4f4cab5b9..9d4b1bca54be 100644
--- a/tools/virtio/vringh_test.c
+++ b/tools/virtio/vringh_test.c
@@ -304,7 +304,7 @@ 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;
@@ -449,13 +449,13 @@ 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);
+ __virtio_set_bit(&vdev, VIRTIO_RING_F_INDIRECT_DESC);
else if (strcmp(argv[1], "--eventidx") == 0)
- vdev.features[0] |= (1 << VIRTIO_RING_F_EVENT_IDX);
+ __virtio_set_bit(&vdev, VIRTIO_RING_F_EVENT_IDX);
else if (strcmp(argv[1], "--slow-range") == 0)
getrange = getrange_slow;
else if (strcmp(argv[1], "--fast-vringh") == 0)
@@ -468,7 +468,7 @@ 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();
@@ -483,7 +483,7 @@ 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... */
@@ -652,13 +652,13 @@ int main(int argc, char *argv[])
}
/* Test weird (but legal!) indirect. */
- if (vdev.features[0] & (1 << VIRTIO_RING_F_INDIRECT_DESC)) {
+ if (__virtio_test_bit(&vdev, 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);
+ __virtio_clear_bit(&vdev, VIRTIO_RING_F_INDIRECT_DESC);
vq = vring_new_virtqueue(0, RINGSIZE, ALIGN, &vdev, true,
__user_addr_min,
never_notify_host,