diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/hv/vmbus_drv.c | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c index 8c3eaee8c54c..45d6d7a0ed89 100644 --- a/drivers/hv/vmbus_drv.c +++ b/drivers/hv/vmbus_drv.c @@ -441,6 +441,43 @@ static ssize_t in_write_bytes_avail_show(struct device *dev, } static DEVICE_ATTR_RO(in_write_bytes_avail); +static ssize_t channel_vp_mapping_show(struct device *dev, + struct device_attribute *dev_attr, + char *buf) +{ + struct hv_device *hv_dev = device_to_hv_device(dev); + struct vmbus_channel *channel = hv_dev->channel, *cur_sc; + unsigned long flags; + int buf_size = PAGE_SIZE, n_written, tot_written; + struct list_head *cur; + + if (!channel) + return -ENODEV; + + tot_written = snprintf(buf, buf_size, "%u:%u\n", + channel->offermsg.child_relid, channel->target_cpu); + + spin_lock_irqsave(&channel->lock, flags); + + list_for_each(cur, &channel->sc_list) { + if (tot_written >= buf_size - 1) + break; + + cur_sc = list_entry(cur, struct vmbus_channel, sc_list); + n_written = scnprintf(buf + tot_written, + buf_size - tot_written, + "%u:%u\n", + cur_sc->offermsg.child_relid, + cur_sc->target_cpu); + tot_written += n_written; + } + + spin_unlock_irqrestore(&channel->lock, flags); + + return tot_written; +} +static DEVICE_ATTR_RO(channel_vp_mapping); + /* Set up per device attributes in /sys/bus/vmbus/devices/<bus device> */ static struct attribute *vmbus_attrs[] = { &dev_attr_id.attr, @@ -465,6 +502,7 @@ static struct attribute *vmbus_attrs[] = { &dev_attr_in_write_index.attr, &dev_attr_in_read_bytes_avail.attr, &dev_attr_in_write_bytes_avail.attr, + &dev_attr_channel_vp_mapping.attr, NULL, }; ATTRIBUTE_GROUPS(vmbus); |