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ipmi: Add a sysfs interface to view the number of users

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A count of users is kept for each interface, allow it to be viewed.

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

Cc: Chen Guanqiao <chen.chenchacha@foxmail.com>
Signed-off-by: Corey Minyard <cminyard@mvista.com>
This commit is contained in:
Corey Minyard 2022-03-29 08:31:36 -05:00
parent 333730e456
commit f60231885f
1 changed files with 21 additions and 0 deletions
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21
drivers/char/ipmi/ipmi_msghandler.c
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@ -457,6 +457,8 @@ struct ipmi_smi {
struct list_head users;
struct srcu_struct users_srcu;
atomic_t nr_users;
struct device_attribute nr_users_devattr;
/* Used for wake ups at startup. */
wait_queue_head_t waitq;
@ -3506,6 +3508,17 @@ void ipmi_poll_interface(struct ipmi_user *user)
}
EXPORT_SYMBOL(ipmi_poll_interface);
static ssize_t nr_users_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct ipmi_smi *intf = container_of(attr,
struct ipmi_smi, nr_users_devattr);
return sysfs_emit(buf, "%d\n", atomic_read(&intf->nr_users));
}
static DEVICE_ATTR_RO(nr_users);
static void redo_bmc_reg(struct work_struct *work)
{
struct ipmi_smi *intf = container_of(work, struct ipmi_smi,
@ -3628,6 +3641,12 @@ int ipmi_add_smi(struct module *owner,
if (rv)
goto out_err_bmc_reg;
intf->nr_users_devattr = dev_attr_nr_users;
sysfs_attr_init(&intf->nr_users_devattr.attr);
rv = device_create_file(intf->si_dev, &intf->nr_users_devattr);
if (rv)
goto out_err_bmc_reg;
/*
* Keep memory order straight for RCU readers. Make
* sure everything else is committed to memory before
@ -3727,6 +3746,8 @@ 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_users_devattr);
/*
* Call all the watcher interfaces to tell them that
* an interface is going away.