linux-kernel - [PATCH 3/3] ipmi: msghandler: add a interface to clean message queue in sysfs

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Message-ID: <tencent_4BC3A56F75CA5B8CE8D32E90FC61A78FFF05@qq.com>
Date:   Mon, 28 Mar 2022 00:47:44 +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 3/3] ipmi: msghandler: add a interface to clean message queue in sysfs

The further approach, add a cleanup interface in sysfs. The administrator write
'1' to clean_msg, and ipmi clear the entire message queue.

Signed-off-by: Chen Guanqiao <chen.chenchacha@...mail.com>
---
 drivers/char/ipmi/ipmi_msghandler.c | 82 +++++++++++++++++++++++++++++
 1 file changed, 82 insertions(+)

diff --git a/drivers/char/ipmi/ipmi_msghandler.c b/drivers/char/ipmi/ipmi_msghandler.c
index 0238be81c435..29d6779a569f 100644
--- a/drivers/char/ipmi/ipmi_msghandler.c
+++ b/drivers/char/ipmi/ipmi_msghandler.c
@@ -46,6 +46,9 @@ static void handle_new_recv_msgs(struct ipmi_smi *intf);
 static void need_waiter(struct ipmi_smi *intf);
 static int handle_one_recv_msg(struct ipmi_smi *intf,
 			       struct ipmi_smi_msg *msg);
+static void deliver_smi_err_response(struct ipmi_smi *intf,
+				     struct ipmi_smi_msg *msg,
+				     unsigned char err);
 
 static bool initialized;
 static bool drvregistered;
@@ -2761,6 +2764,71 @@ static void get_msg_count(unsigned int *hp_count, unsigned int *count)
 	*count = hp_msg_count;
 }
 
+static void __cleanup_msgs_queue(struct ipmi_smi *intf)
+{
+	int i;
+	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) {
+		struct ipmi_smi_msg *msg;
+		struct list_head *entry = NULL;
+
+		while (!list_empty(&intf->xmit_msgs)) {
+			if (!list_empty(&intf->hp_xmit_msgs))
+				entry = intf->hp_xmit_msgs.next;
+			else if (!list_empty(&intf->xmit_msgs))
+				entry = intf->xmit_msgs.next;
+
+			if (!entry)
+				continue;
+
+			list_del(entry);
+			msg = list_entry(entry, struct ipmi_smi_msg, link);
+			deliver_smi_err_response(intf, msg,
+						 IPMI_ERR_UNSPECIFIED);
+		}
+	}
+	if (!run_to_completion)
+		spin_unlock_irqrestore(&intf->xmit_msgs_lock, flags);
+	rcu_read_unlock();
+
+	spin_lock_irqsave(&intf->seq_lock, flags);
+	for (i = 0; i < IPMI_IPMB_NUM_SEQ; i++) {
+		struct seq_table *ent = &intf->seq_table[i];
+
+		if (!ent->inuse)
+			continue;
+		deliver_err_response(intf, ent->recv_msg, IPMI_ERR_UNSPECIFIED);
+	}
+	spin_unlock_irqrestore(&intf->seq_lock, flags);
+}
+
+static void cleanup_msgs_queue(void)
+{
+	struct ipmi_smi *intf;
+	int index;
+
+	index = srcu_read_lock(&ipmi_interfaces_srcu);
+	list_for_each_entry_rcu(intf, &ipmi_interfaces, link) {
+		struct bmc_device *bmc = intf->bmc;
+
+		kref_get(&intf->refcount);
+		mutex_lock(&intf->bmc_reg_mutex);
+		mutex_lock(&bmc->dyn_mutex);
+
+		__cleanup_msgs_queue(intf);
+
+		mutex_unlock(&bmc->dyn_mutex);
+		mutex_unlock(&intf->bmc_reg_mutex);
+		kref_put(&intf->refcount, intf_free);
+	}
+	srcu_read_unlock(&ipmi_interfaces_srcu, index);
+}
+
 static ssize_t device_id_show(struct device *dev,
 			      struct device_attribute *attr,
 			      char *buf)
@@ -2950,6 +3018,19 @@ static ssize_t msg_count_show(struct device *dev, struct device_attribute *attr,
 }
 static DEVICE_ATTR_ADMIN_RO(msg_count);
 
+static ssize_t clean_msgs_store(struct device *dev,
+				struct device_attribute *attr, const char *buf,
+				size_t count)
+{
+	if (!sysfs_streq(buf, "1"))
+		return -EINVAL;
+
+	cleanup_msgs_queue();
+
+	return count;
+}
+static DEVICE_ATTR_WO(clean_msgs);
+
 static struct attribute *bmc_dev_attrs[] = {
 	&dev_attr_device_id.attr,
 	&dev_attr_provides_device_sdrs.attr,
@@ -2963,6 +3044,7 @@ static struct attribute *bmc_dev_attrs[] = {
 	&dev_attr_guid.attr,
 	&dev_attr_user_count.attr,
 	&dev_attr_msg_count.attr,
+	&dev_attr_clean_msgs.attr,
 	NULL
 };
 
-- 
2.25.1