linux-kernel - [PATCH 2/3] ipmi: msghandler: Get the number of message through sysfs

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Date:   Mon, 28 Mar 2022 00:47:43 +0800
From:   Chen Guanqiao <chen.chenchacha@...mail.com>
To:     minyard@....org, openipmi-developer@...ts.sourceforge.net,
        linux-kernel@...r.kernel.org
Cc:     Chen Guanqiao <chen.chenchacha@...mail.com>
Subject: [PATCH 2/3] ipmi: msghandler: Get the number of message through sysfs

Reads the message_count file corresponding the ipmi device, ipmi traverse all
intf, and count the number of message and high priority message.

Signed-off-by: Chen Guanqiao <chen.chenchacha@...mail.com>
---
 drivers/char/ipmi/ipmi_msghandler.c | 44 +++++++++++++++++++++++++++++
 1 file changed, 44 insertions(+)

diff --git a/drivers/char/ipmi/ipmi_msghandler.c b/drivers/char/ipmi/ipmi_msghandler.c
index e14beb51cae4..0238be81c435 100644
--- a/drivers/char/ipmi/ipmi_msghandler.c
+++ b/drivers/char/ipmi/ipmi_msghandler.c
@@ -2729,6 +2729,38 @@ static unsigned int get_user_count(void)
 	return total_count;
 }
 
+static void get_msg_count(unsigned int *hp_count, unsigned int *count)
+{
+	struct ipmi_smi *intf;
+	int index;
+	int hp_msg_count = 0, msg_count = 0;
+
+	index = srcu_read_lock(&ipmi_interfaces_srcu);
+	list_for_each_entry_rcu(intf, &ipmi_interfaces, link) {
+		struct ipmi_smi_msg *msg;
+		unsigned long flags;
+		int run_to_completion = intf->run_to_completion;
+
+		rcu_read_lock();
+		if (!run_to_completion)
+			spin_lock_irqsave(&intf->xmit_msgs_lock, flags);
+		if (!intf->in_shutdown) {
+			list_for_each_entry(msg, &intf->hp_xmit_msgs, link)
+				hp_msg_count++;
+
+			list_for_each_entry(msg, &intf->xmit_msgs, link)
+				msg_count++;
+		}
+		if (!run_to_completion)
+			spin_unlock_irqrestore(&intf->xmit_msgs_lock, flags);
+		rcu_read_unlock();
+	}
+	srcu_read_unlock(&ipmi_interfaces_srcu, index);
+
+	*hp_count = msg_count;
+	*count = hp_msg_count;
+}
+
 static ssize_t device_id_show(struct device *dev,
 			      struct device_attribute *attr,
 			      char *buf)
@@ -2907,6 +2939,17 @@ static ssize_t user_count_show(struct device *dev,
 }
 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,
@@ -2919,6 +2962,7 @@ static struct attribute *bmc_dev_attrs[] = {
 	&dev_attr_aux_firmware_revision.attr,
 	&dev_attr_guid.attr,
 	&dev_attr_user_count.attr,
+	&dev_attr_msg_count.attr,
 	NULL
 };
 
-- 
2.25.1