Commit d5d91586 authored by Corey Minyard's avatar Corey Minyard
Browse files

ipmi: Add a sysfs count of total outstanding messages for an interface 



Go through each user and add its message count to a total and print the
total.

It would be nice to have a per-user file, but there's no user sysfs
entity at this point to hang it off of.  Probably not worth the effort.

Based on work by Chen Guanqiao <chen.chenchacha@foxmail.com>

Cc: Chen Guanqiao <chen.chenchacha@foxmail.com>
Signed-off-by: default avatarCorey Minyard <cminyard@mvista.com>
parent f6023188

drivers/char/ipmi/ipmi_msghandler.c

+29 −0
Original line number Diff line number Diff line
@@ -458,6 +458,7 @@ struct ipmi_smi { 
	struct srcu_struct users_srcu;

	atomic_t nr_users;

	struct device_attribute nr_users_devattr;

	struct device_attribute nr_msgs_devattr;





	/* Used for wake ups at startup. */
@@ -3519,6 +3520,25 @@ static ssize_t nr_users_show(struct device *dev, 
}

static DEVICE_ATTR_RO(nr_users);



static ssize_t nr_msgs_show(struct device *dev,

			    struct device_attribute *attr,

			    char *buf)

{

	struct ipmi_smi *intf = container_of(attr,

			 struct ipmi_smi, nr_msgs_devattr);

	struct ipmi_user *user;

	int index;

	unsigned int count = 0;



	index = srcu_read_lock(&intf->users_srcu);

	list_for_each_entry_rcu(user, &intf->users, link)

		count += atomic_read(&user->nr_msgs);

	srcu_read_unlock(&intf->users_srcu, index);



	return sysfs_emit(buf, "%u\n", count);

}

static DEVICE_ATTR_RO(nr_msgs);



static void redo_bmc_reg(struct work_struct *work)

{

	struct ipmi_smi *intf = container_of(work, struct ipmi_smi,
@@ -3647,6 +3667,14 @@ int ipmi_add_smi(struct module *owner, 
	if (rv)

		goto out_err_bmc_reg;



	intf->nr_msgs_devattr = dev_attr_nr_msgs;

	sysfs_attr_init(&intf->nr_msgs_devattr.attr);

	rv = device_create_file(intf->si_dev, &intf->nr_msgs_devattr);

	if (rv) {

		device_remove_file(intf->si_dev, &intf->nr_users_devattr);

		goto out_err_bmc_reg;

	}



	/*

	 * Keep memory order straight for RCU readers.  Make

	 * sure everything else is committed to memory before
@@ -3746,6 +3774,7 @@ void ipmi_unregister_smi(struct ipmi_smi *intf) 


	/* At this point no users can be added to the interface. */



	device_remove_file(intf->si_dev, &intf->nr_msgs_devattr);

	device_remove_file(intf->si_dev, &intf->nr_users_devattr);



	/*