[Openipmi-developer] [PATCH v2 3/4] ipmi: msghandler: Get the number of users and messages through sysfs

[Chen Guanqiao]

The administrator reads the user_count and msg_count file
corresponding the ipmi device, ipmi traverse all intf, and count
the number of users and messages.

Signed-off-by: Chen Guanqiao <chen.chencha...@foxmail.com>
---
 drivers/char/ipmi/ipmi_msghandler.c | 71 +++++++++++++++++++++++++++++
 1 file changed, 71 insertions(+)

diff --git a/drivers/char/ipmi/ipmi_msghandler.c 
b/drivers/char/ipmi/ipmi_msghandler.c
index 80ab88702c5f..a188dc7e7135 100644
--- a/drivers/char/ipmi/ipmi_msghandler.c
+++ b/drivers/char/ipmi/ipmi_msghandler.c
@@ -922,6 +922,19 @@ unsigned int ipmi_addr_length(int addr_type)
 }
 EXPORT_SYMBOL(ipmi_addr_length);

+static unsigned int intf_user_count(struct ipmi_smi *intf)
+{
+       struct ipmi_user *user;
+       int index, count = 0;
+
+       index = srcu_read_lock(&intf->users_srcu);
+       list_for_each_entry_rcu(user, &intf->users, link)
+               count++;
+       srcu_read_unlock(&intf->users_srcu, index);
+
+       return count;
+}
+
 static void intf_msg_count(struct ipmi_smi *intf,
                           unsigned int *hp_count, unsigned int *count)
 {
@@ -2760,6 +2773,42 @@ static int bmc_get_device_id(struct ipmi_smi *intf, 
struct bmc_device *bmc,
        return __bmc_get_device_id(intf, bmc, id, guid_set, guid, -1);
 }

+static unsigned int get_user_count(void)
+{
+       struct ipmi_smi *intf;
+       int index;
+       unsigned int count = 0;
+
+       index = srcu_read_lock(&ipmi_interfaces_srcu);
+       list_for_each_entry_rcu(intf, &ipmi_interfaces, link)
+               count += intf_user_count(intf);
+       srcu_read_unlock(&ipmi_interfaces_srcu, index);
+
+       return count;
+}
+
+static void get_msg_count(unsigned int *hp_count, unsigned int *count)
+{
+       struct ipmi_smi *intf;
+       int index;
+
+       *hp_count = 0;
+       *count = 0;
+
+       index = srcu_read_lock(&ipmi_interfaces_srcu);
+       list_for_each_entry_rcu(intf, &ipmi_interfaces, link) {
+               int hp_msg_count = 0, msg_count = 0;
+
+               rcu_read_lock();
+               intf_msg_count(intf, &hp_msg_count, &msg_count);
+               rcu_read_unlock();
+
+               *hp_count += hp_msg_count;
+               *count += msg_count;
+       }
+       srcu_read_unlock(&ipmi_interfaces_srcu, index);
+}
+
 static ssize_t device_id_show(struct device *dev,
                              struct device_attribute *attr,
                              char *buf)
@@ -2929,6 +2978,26 @@ static ssize_t guid_show(struct device *dev, struct 
device_attribute *attr,
 }
 static DEVICE_ATTR_RO(guid);

+static ssize_t user_count_show(struct device *dev, struct device_attribute 
*attr,
+                              char *buf)
+{
+       unsigned int user_count = get_user_count();
+
+       return snprintf(buf, 20, "%u\n", user_count);
+}
+static DEVICE_ATTR_ADMIN_RO(user_count);
+
+static ssize_t msg_count_show(struct device *dev, struct device_attribute 
*attr,
+                             char *buf)
+{
+       unsigned int hp_count, count;
+
+       get_msg_count(&hp_count, &count);
+
+       return snprintf(buf, 40, "hp msg:%u, msg:%u\n", hp_count, count);
+}
+static DEVICE_ATTR_ADMIN_RO(msg_count);
+
 static struct attribute *bmc_dev_attrs[] = {
        &dev_attr_device_id.attr,
        &dev_attr_provides_device_sdrs.attr,
@@ -2940,6 +3009,8 @@ static struct attribute *bmc_dev_attrs[] = {
        &dev_attr_product_id.attr,
        &dev_attr_aux_firmware_revision.attr,
        &dev_attr_guid.attr,
+       &dev_attr_user_count.attr,
+       &dev_attr_msg_count.attr,
        NULL
 };

--
2.25.1



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