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- diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c
- index 64713ff..e51b080 100644
- --- a/drivers/hv/vmbus_drv.c
- +++ b/drivers/hv/vmbus_drv.c
- @@ -476,6 +476,68 @@ static ssize_t channel_vp_mapping_show(struct device *dev,
- }
- static DEVICE_ATTR_RO(channel_vp_mapping);
- +static ssize_t channel_rb_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;
- +
- + struct hv_ring_buffer_debug_info inbound;
- + struct hv_ring_buffer_debug_info outbound;
- + int nr = 0;
- +
- + if (!channel)
- + return -ENODEV;
- +
- + hv_ringbuffer_get_debuginfo(&channel->inbound, &inbound);
- + hv_ringbuffer_get_debuginfo(&channel->outbound, &outbound);
- +
- + tot_written = snprintf(buf, buf_size,
- +"channel #[%d:%d]: in_intr_mask=%u, in_pending_send_sz=%u, in_read_bytes_avail=%u, in_write_bytes_avail=%u, in_read_index=%u, in_write_index=%u;out_intr_mask=%u, out_pending_send_sz=%u, out_read_bytes_avail=%u, out_write_bytes_avail=%u, out_read_index=%u, out_write_index=%u\n",
- + nr, channel->offermsg.child_relid, inbound.current_interrupt_mask,
- + channel->inbound.ring_buffer->pending_send_sz,
- + inbound.bytes_avail_toread, inbound.bytes_avail_towrite,
- + inbound.current_read_index, inbound.current_write_index,
- + outbound.current_interrupt_mask,
- + channel->outbound.ring_buffer->pending_send_sz,
- + outbound.bytes_avail_toread, outbound.bytes_avail_towrite,
- + outbound.current_read_index, outbound.current_write_index);
- +
- + 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);
- + hv_ringbuffer_get_debuginfo(&cur_sc->inbound, &inbound);
- + hv_ringbuffer_get_debuginfo(&cur_sc->outbound, &outbound);
- +
- + ++nr;
- + n_written = scnprintf(buf + tot_written,
- + buf_size - tot_written,
- +"channel #[%d:%d]: in_intr_mask=%u, in_pending_send_sz=%u, in_read_bytes_avail=%u, in_write_bytes_avail=%u, in_read_index=%u, in_write_index=%u;out_intr_mask=%u, out_pending_send_sz=%u, out_read_bytes_avail=%u, out_write_bytes_avail=%u, out_read_index=%u, out_write_index=%u\n",
- + nr, cur_sc->offermsg.child_relid, inbound.current_interrupt_mask,
- + cur_sc->inbound.ring_buffer->pending_send_sz,
- + inbound.bytes_avail_toread, inbound.bytes_avail_towrite,
- + inbound.current_read_index, inbound.current_write_index,
- + outbound.current_interrupt_mask,
- + cur_sc->outbound.ring_buffer->pending_send_sz,
- + outbound.bytes_avail_toread, outbound.bytes_avail_towrite,
- + outbound.current_read_index, outbound.current_write_index);
- + tot_written += n_written;
- + }
- +
- + spin_unlock_irqrestore(&channel->lock, flags);
- +
- + return tot_written;
- +}
- +static DEVICE_ATTR_RO(channel_rb);
- +
- static ssize_t vendor_show(struct device *dev,
- struct device_attribute *dev_attr,
- char *buf)
- @@ -519,6 +581,7 @@ static struct attribute *vmbus_attrs[] = {
- &dev_attr_in_read_bytes_avail.attr,
- &dev_attr_in_write_bytes_avail.attr,
- &dev_attr_channel_vp_mapping.attr,
- + &dev_attr_channel_rb.attr,
- &dev_attr_vendor.attr,
- &dev_attr_device.attr,
- NULL,
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