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

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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: Corey Minyard <cminyard@mvista.com>
This commit is contained in:
Corey Minyard 2022-03-29 13:13:34 -05:00
parent f60231885f
commit d5d91586be
1 changed files with 29 additions and 0 deletions
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29
drivers/char/ipmi/ipmi_msghandler.c
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@ -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);
/*