diff --git a/Documentation/ABI/stable/sysfs-bus-vmbus b/Documentation/ABI/stable/sysfs-bus-vmbus
index 5d0125f7bcaf145088359bed69a2ba2cce07fa97..0ebd8a1537a045b5b7362aced567f372570d18b9 100644
--- a/Documentation/ABI/stable/sysfs-bus-vmbus
+++ b/Documentation/ABI/stable/sysfs-bus-vmbus
@@ -41,3 +41,59 @@ KernelVersion: 4.5
Contact: K. Y. Srinivasan <kys@microsoft.com>
Description: The 16 bit vendor ID of the device
Users: tools/hv/lsvmbus and user level RDMA libraries
+
+What: /sys/bus/vmbus/devices/vmbus_*/channels/relid/cpu
+Date: September. 2017
+KernelVersion: 4.14
+Contact: Stephen Hemminger <sthemmin@microsoft.com>
+Description: VCPU (sub)channel is affinitized to
+Users: tools/hv/lsvmbus and other debuggig tools
+
+What: /sys/bus/vmbus/devices/vmbus_*/channels/relid/cpu
+Date: September. 2017
+KernelVersion: 4.14
+Contact: Stephen Hemminger <sthemmin@microsoft.com>
+Description: VCPU (sub)channel is affinitized to
+Users: tools/hv/lsvmbus and other debuggig tools
+
+What: /sys/bus/vmbus/devices/vmbus_*/channels/relid/in_mask
+Date: September. 2017
+KernelVersion: 4.14
+Contact: Stephen Hemminger <sthemmin@microsoft.com>
+Description: Inbound channel signaling state
+Users: Debuggig tools
+
+What: /sys/bus/vmbus/devices/vmbus_*/channels/relid/latency
+Date: September. 2017
+KernelVersion: 4.14
+Contact: Stephen Hemminger <sthemmin@microsoft.com>
+Description: Channel signaling latency
+Users: Debuggig tools
+
+What: /sys/bus/vmbus/devices/vmbus_*/channels/relid/out_mask
+Date: September. 2017
+KernelVersion: 4.14
+Contact: Stephen Hemminger <sthemmin@microsoft.com>
+Description: Outbound channel signaling state
+Users: Debuggig tools
+
+What: /sys/bus/vmbus/devices/vmbus_*/channels/relid/pending
+Date: September. 2017
+KernelVersion: 4.14
+Contact: Stephen Hemminger <sthemmin@microsoft.com>
+Description: Channel interrupt pending state
+Users: Debuggig tools
+
+What: /sys/bus/vmbus/devices/vmbus_*/channels/relid/read_avail
+Date: September. 2017
+KernelVersion: 4.14
+Contact: Stephen Hemminger <sthemmin@microsoft.com>
+Description: Bytes availabble to read
+Users: Debuggig tools
+
+What: /sys/bus/vmbus/devices/vmbus_*/channels/relid/write_avail
+Date: September. 2017
+KernelVersion: 4.14
+Contact: Stephen Hemminger <sthemmin@microsoft.com>
+Description: Bytes availabble to write
+Users: Debuggig tools
diff --git a/drivers/hv/channel_mgmt.c b/drivers/hv/channel_mgmt.c
index 060df71c2e8b72f42020168fb574ff42f6827729..dd2dffe816be1acb01cb425d0b47d1325fe37c4b 100644
--- a/drivers/hv/channel_mgmt.c
+++ b/drivers/hv/channel_mgmt.c
@@ -350,7 +350,7 @@ static void free_channel(struct vmbus_channel *channel)
{
tasklet_kill(&channel->callback_event);
- kfree_rcu(channel, rcu);
+ kobject_put(&channel->kobj);
}
static void percpu_channel_enq(void *arg)
@@ -513,6 +513,14 @@ static void vmbus_process_offer(struct vmbus_channel *newchannel)
newchannel->state = CHANNEL_OPEN_STATE;
if (!fnew) {
+ struct hv_device *dev
+ = newchannel->primary_channel->device_obj;
+
+ if (vmbus_add_channel_kobj(dev, newchannel)) {
+ atomic_dec(&vmbus_connection.offer_in_progress);
+ goto err_free_chan;
+ }
+
if (channel->sc_creation_callback != NULL)
channel->sc_creation_callback(newchannel);
return;
diff --git a/drivers/hv/hyperv_vmbus.h b/drivers/hv/hyperv_vmbus.h
index 49569f8fe038ad4cac53bce3e9c596e91feaf1c1..de6f01df9592cf377f6a0fb971c6fab58a04d8b1 100644
--- a/drivers/hv/hyperv_vmbus.h
+++ b/drivers/hv/hyperv_vmbus.h
@@ -373,6 +373,8 @@ struct hv_device *vmbus_device_create(const uuid_le *type,
int vmbus_device_register(struct hv_device *child_device_obj);
void vmbus_device_unregister(struct hv_device *device_obj);
+int vmbus_add_channel_kobj(struct hv_device *device_obj,
+ struct vmbus_channel *channel);
struct vmbus_channel *relid2channel(u32 relid);
diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c
index a9d49f6f6501ccb1965217abb429d13571f26f12..a209527b09f565deedfc4544833259fcefca27f8 100644
--- a/drivers/hv/vmbus_drv.c
+++ b/drivers/hv/vmbus_drv.c
@@ -107,28 +107,30 @@ static void print_alias_name(struct hv_device *hv_dev, char *alias_name)
sprintf(&alias_name[i], "%02x", hv_dev->dev_type.b[i/2]);
}
-static u8 channel_monitor_group(struct vmbus_channel *channel)
+static u8 channel_monitor_group(const struct vmbus_channel *channel)
{
return (u8)channel->offermsg.monitorid / 32;
}
-static u8 channel_monitor_offset(struct vmbus_channel *channel)
+static u8 channel_monitor_offset(const struct vmbus_channel *channel)
{
return (u8)channel->offermsg.monitorid % 32;
}
-static u32 channel_pending(struct vmbus_channel *channel,
- struct hv_monitor_page *monitor_page)
+static u32 channel_pending(const struct vmbus_channel *channel,
+ const struct hv_monitor_page *monitor_page)
{
u8 monitor_group = channel_monitor_group(channel);
+
return monitor_page->trigger_group[monitor_group].pending;
}
-static u32 channel_latency(struct vmbus_channel *channel,
- struct hv_monitor_page *monitor_page)
+static u32 channel_latency(const struct vmbus_channel *channel,
+ const struct hv_monitor_page *monitor_page)
{
u8 monitor_group = channel_monitor_group(channel);
u8 monitor_offset = channel_monitor_offset(channel);
+
return monitor_page->latency[monitor_group][monitor_offset];
}
@@ -1134,6 +1136,145 @@ void vmbus_driver_unregister(struct hv_driver *hv_driver)
}
EXPORT_SYMBOL_GPL(vmbus_driver_unregister);
+
+/*
+ * Called when last reference to channel is gone.
+ */
+static void vmbus_chan_release(struct kobject *kobj)
+{
+ struct vmbus_channel *channel
+ = container_of(kobj, struct vmbus_channel, kobj);
+
+ kfree_rcu(channel, rcu);
+}
+
+struct vmbus_chan_attribute {
+ struct attribute attr;
+ ssize_t (*show)(const struct vmbus_channel *chan, char *buf);
+ ssize_t (*store)(struct vmbus_channel *chan,
+ const char *buf, size_t count);
+};
+#define VMBUS_CHAN_ATTR(_name, _mode, _show, _store) \
+ struct vmbus_chan_attribute chan_attr_##_name \
+ = __ATTR(_name, _mode, _show, _store)
+#define VMBUS_CHAN_ATTR_RW(_name) \
+ struct vmbus_chan_attribute chan_attr_##_name = __ATTR_RW(_name)
+#define VMBUS_CHAN_ATTR_RO(_name) \
+ struct vmbus_chan_attribute chan_attr_##_name = __ATTR_RO(_name)
+#define VMBUS_CHAN_ATTR_WO(_name) \
+ struct vmbus_chan_attribute chan_attr_##_name = __ATTR_WO(_name)
+
+static ssize_t vmbus_chan_attr_show(struct kobject *kobj,
+ struct attribute *attr, char *buf)
+{
+ const struct vmbus_chan_attribute *attribute
+ = container_of(attr, struct vmbus_chan_attribute, attr);
+ const struct vmbus_channel *chan
+ = container_of(kobj, struct vmbus_channel, kobj);
+
+ if (!attribute->show)
+ return -EIO;
+
+ return attribute->show(chan, buf);
+}
+
+static const struct sysfs_ops vmbus_chan_sysfs_ops = {
+ .show = vmbus_chan_attr_show,
+};
+
+static ssize_t out_mask_show(const struct vmbus_channel *channel, char *buf)
+{
+ const struct hv_ring_buffer_info *rbi = &channel->outbound;
+
+ return sprintf(buf, "%u\n", rbi->ring_buffer->interrupt_mask);
+}
+VMBUS_CHAN_ATTR_RO(out_mask);
+
+static ssize_t in_mask_show(const struct vmbus_channel *channel, char *buf)
+{
+ const struct hv_ring_buffer_info *rbi = &channel->inbound;
+
+ return sprintf(buf, "%u\n", rbi->ring_buffer->interrupt_mask);
+}
+VMBUS_CHAN_ATTR_RO(in_mask);
+
+static ssize_t read_avail_show(const struct vmbus_channel *channel, char *buf)
+{
+ const struct hv_ring_buffer_info *rbi = &channel->inbound;
+
+ return sprintf(buf, "%u\n", hv_get_bytes_to_read(rbi));
+}
+VMBUS_CHAN_ATTR_RO(read_avail);
+
+static ssize_t write_avail_show(const struct vmbus_channel *channel, char *buf)
+{
+ const struct hv_ring_buffer_info *rbi = &channel->outbound;
+
+ return sprintf(buf, "%u\n", hv_get_bytes_to_write(rbi));
+}
+VMBUS_CHAN_ATTR_RO(write_avail);
+
+static ssize_t show_target_cpu(const struct vmbus_channel *channel, char *buf)
+{
+ return sprintf(buf, "%u\n", channel->target_cpu);
+}
+VMBUS_CHAN_ATTR(cpu, S_IRUGO, show_target_cpu, NULL);
+
+static ssize_t channel_pending_show(const struct vmbus_channel *channel,
+ char *buf)
+{
+ return sprintf(buf, "%d\n",
+ channel_pending(channel,
+ vmbus_connection.monitor_pages[1]));
+}
+VMBUS_CHAN_ATTR(pending, S_IRUGO, channel_pending_show, NULL);
+
+static ssize_t channel_latency_show(const struct vmbus_channel *channel,
+ char *buf)
+{
+ return sprintf(buf, "%d\n",
+ channel_latency(channel,
+ vmbus_connection.monitor_pages[1]));
+}
+VMBUS_CHAN_ATTR(latency, S_IRUGO, channel_latency_show, NULL);
+
+static struct attribute *vmbus_chan_attrs[] = {
+ &chan_attr_out_mask.attr,
+ &chan_attr_in_mask.attr,
+ &chan_attr_read_avail.attr,
+ &chan_attr_write_avail.attr,
+ &chan_attr_cpu.attr,
+ &chan_attr_pending.attr,
+ &chan_attr_latency.attr,
+ NULL
+};
+
+static struct kobj_type vmbus_chan_ktype = {
+ .sysfs_ops = &vmbus_chan_sysfs_ops,
+ .release = vmbus_chan_release,
+ .default_attrs = vmbus_chan_attrs,
+};
+
+/*
+ * vmbus_add_channel_kobj - setup a sub-directory under device/channels
+ */
+int vmbus_add_channel_kobj(struct hv_device *dev, struct vmbus_channel *channel)
+{
+ struct kobject *kobj = &channel->kobj;
+ u32 relid = channel->offermsg.child_relid;
+ int ret;
+
+ kobj->kset = dev->channels_kset;
+ ret = kobject_init_and_add(kobj, &vmbus_chan_ktype, NULL,
+ "%u", relid);
+ if (ret)
+ return ret;
+
+ kobject_uevent(kobj, KOBJ_ADD);
+
+ return 0;
+}
+
/*
* vmbus_device_create - Creates and registers a new child device
* on the vmbus.
@@ -1165,7 +1306,8 @@ struct hv_device *vmbus_device_create(const uuid_le *type,
*/
int vmbus_device_register(struct hv_device *child_device_obj)
{
- int ret = 0;
+ struct kobject *kobj = &child_device_obj->device.kobj;
+ int ret;
dev_set_name(&child_device_obj->device, "%pUl",
child_device_obj->channel->offermsg.offer.if_instance.b);
@@ -1179,13 +1321,32 @@ int vmbus_device_register(struct hv_device *child_device_obj)
* binding...which will eventually call vmbus_match() and vmbus_probe()
*/
ret = device_register(&child_device_obj->device);
-
- if (ret)
+ if (ret) {
pr_err("Unable to register child device\n");
- else
- pr_debug("child device %s registered\n",
- dev_name(&child_device_obj->device));
+ return ret;
+ }
+
+ child_device_obj->channels_kset = kset_create_and_add("channels",
+ NULL, kobj);
+ if (!child_device_obj->channels_kset) {
+ ret = -ENOMEM;
+ goto err_dev_unregister;
+ }
+
+ ret = vmbus_add_channel_kobj(child_device_obj,
+ child_device_obj->channel);
+ if (ret) {
+ pr_err("Unable to register primary channeln");
+ goto err_kset_unregister;
+ }
+
+ return 0;
+
+err_kset_unregister:
+ kset_unregister(child_device_obj->channels_kset);
+err_dev_unregister:
+ device_unregister(&child_device_obj->device);
return ret;
}
diff --git a/include/linux/hyperv.h b/include/linux/hyperv.h
index c458d7b7ad197688469772fb0c842180c668864c..ef16ee0398501376530ab1ed35345f09ab1ff2ca 100644
--- a/include/linux/hyperv.h
+++ b/include/linux/hyperv.h
@@ -828,6 +828,11 @@ struct vmbus_channel {
*/
struct rcu_head rcu;
+ /*
+ * For sysfs per-channel properties.
+ */
+ struct kobject kobj;
+
/*
* For performance critical channels (storage, networking
* etc,), Hyper-V has a mechanism to enhance the throughput
@@ -1089,6 +1094,7 @@ struct hv_device {
struct device device;
struct vmbus_channel *channel;
+ struct kset *channels_kset;
};