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| author | Rusty Russell <rusty@rustcorp.com.au> | 2009-06-12 22:16:37 -0600 |
|---|---|---|
| committer | Rusty Russell <rusty@rustcorp.com.au> | 2009-06-12 22:16:38 +0930 |
| commit | a92892825a122a74ddad1d408fa27132e28b05ae (patch) | |
| tree | c8dad18eb7842a10a33cdf632b5e0a0aa8fdf778 /drivers/virtio | |
| parent | 82af8ce84ed65d2fb6d8c017d3f2bbbf161061fb (diff) | |
| download | linux-3.10-a92892825a122a74ddad1d408fa27132e28b05ae.tar.gz linux-3.10-a92892825a122a74ddad1d408fa27132e28b05ae.tar.bz2 linux-3.10-a92892825a122a74ddad1d408fa27132e28b05ae.zip | |
virtio: expose features in sysfs
Each device negotiates feature bits; expose these in sysfs to help
diagnostics and debugging.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Diffstat (limited to 'drivers/virtio')
| -rw-r--r-- | drivers/virtio/virtio.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/drivers/virtio/virtio.c b/drivers/virtio/virtio.c index 3f52c767dfe..bd0745250fd 100644 --- a/drivers/virtio/virtio.c +++ b/drivers/virtio/virtio.c @@ -31,11 +31,27 @@ static ssize_t modalias_show(struct device *_d, return sprintf(buf, "virtio:d%08Xv%08X\n", dev->id.device, dev->id.vendor); } +static ssize_t features_show(struct device *_d, + struct device_attribute *attr, char *buf) +{ + struct virtio_device *dev = container_of(_d, struct virtio_device, dev); + unsigned int i; + ssize_t len = 0; + + /* 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++) + len += sprintf(buf+len, "%c", + test_bit(i, dev->features) ? '1' : '0'); + len += sprintf(buf+len, "\n"); + return len; +} static struct device_attribute virtio_dev_attrs[] = { __ATTR_RO(device), __ATTR_RO(vendor), __ATTR_RO(status), __ATTR_RO(modalias), + __ATTR_RO(features), __ATTR_NULL }; |