Adding upstream version 5.10.209.upstream/5.10.209

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 180 insertions, 0 deletions

diff --git a/drivers/s390/net/smsgiucv.c b/drivers/s390/net/smsgiucv.c
new file mode 100644
index 000000000..c84ec2fbf
--- /dev/null
+++ b/drivers/s390/net/smsgiucv.c
@@ -0,0 +1,180 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * IUCV special message driver
+ *
+ * Copyright IBM Corp. 2003, 2009
+ *
+ * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com)
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/errno.h>
+#include <linux/device.h>
+#include <linux/slab.h>
+#include <net/iucv/iucv.h>
+#include <asm/cpcmd.h>
+#include <asm/ebcdic.h>
+#include "smsgiucv.h"
+
+struct smsg_callback {
+	struct list_head list;
+	const char *prefix;
+	int len;
+	void (*callback)(const char *from, char *str);
+};
+
+MODULE_AUTHOR
+   ("(C) 2003 IBM Corporation by Martin Schwidefsky (schwidefsky@de.ibm.com)");
+MODULE_DESCRIPTION ("Linux for S/390 IUCV special message driver");
+
+static struct iucv_path *smsg_path;
+
+static DEFINE_SPINLOCK(smsg_list_lock);
+static LIST_HEAD(smsg_list);
+
+static int smsg_path_pending(struct iucv_path *, u8 *, u8 *);
+static void smsg_message_pending(struct iucv_path *, struct iucv_message *);
+
+static struct iucv_handler smsg_handler = {
+	.path_pending	 = smsg_path_pending,
+	.message_pending = smsg_message_pending,
+};
+
+static int smsg_path_pending(struct iucv_path *path, u8 *ipvmid, u8 *ipuser)
+{
+	if (strncmp(ipvmid, "*MSG    ", 8) != 0)
+		return -EINVAL;
+	/* Path pending from *MSG. */
+	return iucv_path_accept(path, &smsg_handler, "SMSGIUCV        ", NULL);
+}
+
+static void smsg_message_pending(struct iucv_path *path,
+				 struct iucv_message *msg)
+{
+	struct smsg_callback *cb;
+	unsigned char *buffer;
+	unsigned char sender[9];
+	int rc, i;
+
+	buffer = kmalloc(msg->length + 1, GFP_ATOMIC | GFP_DMA);
+	if (!buffer) {
+		iucv_message_reject(path, msg);
+		return;
+	}
+	rc = iucv_message_receive(path, msg, 0, buffer, msg->length, NULL);
+	if (rc == 0) {
+		buffer[msg->length] = 0;
+		EBCASC(buffer, msg->length);
+		memcpy(sender, buffer, 8);
+		sender[8] = 0;
+		/* Remove trailing whitespace from the sender name. */
+		for (i = 7; i >= 0; i--) {
+			if (sender[i] != ' ' && sender[i] != '\t')
+				break;
+			sender[i] = 0;
+		}
+		spin_lock(&smsg_list_lock);
+		list_for_each_entry(cb, &smsg_list, list)
+			if (strncmp(buffer + 8, cb->prefix, cb->len) == 0) {
+				cb->callback(sender, buffer + 8);
+				break;
+			}
+		spin_unlock(&smsg_list_lock);
+	}
+	kfree(buffer);
+}
+
+int smsg_register_callback(const char *prefix,
+			   void (*callback)(const char *from, char *str))
+{
+	struct smsg_callback *cb;
+
+	cb = kmalloc(sizeof(struct smsg_callback), GFP_KERNEL);
+	if (!cb)
+		return -ENOMEM;
+	cb->prefix = prefix;
+	cb->len = strlen(prefix);
+	cb->callback = callback;
+	spin_lock_bh(&smsg_list_lock);
+	list_add_tail(&cb->list, &smsg_list);
+	spin_unlock_bh(&smsg_list_lock);
+	return 0;
+}
+
+void smsg_unregister_callback(const char *prefix,
+			      void (*callback)(const char *from,
+					       char *str))
+{
+	struct smsg_callback *cb, *tmp;
+
+	spin_lock_bh(&smsg_list_lock);
+	cb = NULL;
+	list_for_each_entry(tmp, &smsg_list, list)
+		if (tmp->callback == callback &&
+		    strcmp(tmp->prefix, prefix) == 0) {
+			cb = tmp;
+			list_del(&cb->list);
+			break;
+		}
+	spin_unlock_bh(&smsg_list_lock);
+	kfree(cb);
+}
+
+static struct device_driver smsg_driver = {
+	.owner = THIS_MODULE,
+	.name = SMSGIUCV_DRV_NAME,
+	.bus  = &iucv_bus,
+};
+
+static void __exit smsg_exit(void)
+{
+	cpcmd("SET SMSG OFF", NULL, 0, NULL);
+	iucv_unregister(&smsg_handler, 1);
+	driver_unregister(&smsg_driver);
+}
+
+static int __init smsg_init(void)
+{
+	int rc;
+
+	if (!MACHINE_IS_VM) {
+		rc = -EPROTONOSUPPORT;
+		goto out;
+	}
+	rc = driver_register(&smsg_driver);
+	if (rc != 0)
+		goto out;
+	rc = iucv_register(&smsg_handler, 1);
+	if (rc)
+		goto out_driver;
+	smsg_path = iucv_path_alloc(255, 0, GFP_KERNEL);
+	if (!smsg_path) {
+		rc = -ENOMEM;
+		goto out_register;
+	}
+	rc = iucv_path_connect(smsg_path, &smsg_handler, "*MSG    ",
+			       NULL, NULL, NULL);
+	if (rc)
+		goto out_free_path;
+
+	cpcmd("SET SMSG IUCV", NULL, 0, NULL);
+	return 0;
+
+out_free_path:
+	iucv_path_free(smsg_path);
+	smsg_path = NULL;
+out_register:
+	iucv_unregister(&smsg_handler, 1);
+out_driver:
+	driver_unregister(&smsg_driver);
+out:
+	return rc;
+}
+
+module_init(smsg_init);
+module_exit(smsg_exit);
+MODULE_LICENSE("GPL");
+
+EXPORT_SYMBOL(smsg_register_callback);
+EXPORT_SYMBOL(smsg_unregister_callback);