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authorYunhong Jiang <yunhong.jiang@intel.com>2015-08-04 12:17:53 -0700
committerYunhong Jiang <yunhong.jiang@intel.com>2015-08-04 15:44:42 -0700
commit9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 (patch)
tree1c9cafbcd35f783a87880a10f85d1a060db1a563 /kernel/drivers/scsi/arm/msgqueue.c
parent98260f3884f4a202f9ca5eabed40b1354c489b29 (diff)
Add the rt linux 4.1.3-rt3 as base
Import the rt linux 4.1.3-rt3 as OPNFV kvm base. It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and the base is: commit 0917f823c59692d751951bf5ea699a2d1e2f26a2 Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Date: Sat Jul 25 12:13:34 2015 +0200 Prepare v4.1.3-rt3 Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> We lose all the git history this way and it's not good. We should apply another opnfv project repo in future. Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423 Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>
Diffstat (limited to 'kernel/drivers/scsi/arm/msgqueue.c')
-rw-r--r--kernel/drivers/scsi/arm/msgqueue.c171
1 files changed, 171 insertions, 0 deletions
diff --git a/kernel/drivers/scsi/arm/msgqueue.c b/kernel/drivers/scsi/arm/msgqueue.c
new file mode 100644
index 000000000..7c95c7582
--- /dev/null
+++ b/kernel/drivers/scsi/arm/msgqueue.c
@@ -0,0 +1,171 @@
+/*
+ * linux/drivers/acorn/scsi/msgqueue.c
+ *
+ * Copyright (C) 1997-1998 Russell King
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * message queue handling
+ */
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/stddef.h>
+#include <linux/init.h>
+
+#include "msgqueue.h"
+
+/*
+ * Function: struct msgqueue_entry *mqe_alloc(MsgQueue_t *msgq)
+ * Purpose : Allocate a message queue entry
+ * Params : msgq - message queue to claim entry for
+ * Returns : message queue entry or NULL.
+ */
+static struct msgqueue_entry *mqe_alloc(MsgQueue_t *msgq)
+{
+ struct msgqueue_entry *mq;
+
+ if ((mq = msgq->free) != NULL)
+ msgq->free = mq->next;
+
+ return mq;
+}
+
+/*
+ * Function: void mqe_free(MsgQueue_t *msgq, struct msgqueue_entry *mq)
+ * Purpose : free a message queue entry
+ * Params : msgq - message queue to free entry from
+ * mq - message queue entry to free
+ */
+static void mqe_free(MsgQueue_t *msgq, struct msgqueue_entry *mq)
+{
+ if (mq) {
+ mq->next = msgq->free;
+ msgq->free = mq;
+ }
+}
+
+/*
+ * Function: void msgqueue_initialise(MsgQueue_t *msgq)
+ * Purpose : initialise a message queue
+ * Params : msgq - queue to initialise
+ */
+void msgqueue_initialise(MsgQueue_t *msgq)
+{
+ int i;
+
+ msgq->qe = NULL;
+ msgq->free = &msgq->entries[0];
+
+ for (i = 0; i < NR_MESSAGES; i++)
+ msgq->entries[i].next = &msgq->entries[i + 1];
+
+ msgq->entries[NR_MESSAGES - 1].next = NULL;
+}
+
+
+/*
+ * Function: void msgqueue_free(MsgQueue_t *msgq)
+ * Purpose : free a queue
+ * Params : msgq - queue to free
+ */
+void msgqueue_free(MsgQueue_t *msgq)
+{
+}
+
+/*
+ * Function: int msgqueue_msglength(MsgQueue_t *msgq)
+ * Purpose : calculate the total length of all messages on the message queue
+ * Params : msgq - queue to examine
+ * Returns : number of bytes of messages in queue
+ */
+int msgqueue_msglength(MsgQueue_t *msgq)
+{
+ struct msgqueue_entry *mq = msgq->qe;
+ int length = 0;
+
+ for (mq = msgq->qe; mq; mq = mq->next)
+ length += mq->msg.length;
+
+ return length;
+}
+
+/*
+ * Function: struct message *msgqueue_getmsg(MsgQueue_t *msgq, int msgno)
+ * Purpose : return a message
+ * Params : msgq - queue to obtain message from
+ * : msgno - message number
+ * Returns : pointer to message string, or NULL
+ */
+struct message *msgqueue_getmsg(MsgQueue_t *msgq, int msgno)
+{
+ struct msgqueue_entry *mq;
+
+ for (mq = msgq->qe; mq && msgno; mq = mq->next, msgno--);
+
+ return mq ? &mq->msg : NULL;
+}
+
+/*
+ * Function: int msgqueue_addmsg(MsgQueue_t *msgq, int length, ...)
+ * Purpose : add a message onto a message queue
+ * Params : msgq - queue to add message on
+ * length - length of message
+ * ... - message bytes
+ * Returns : != 0 if successful
+ */
+int msgqueue_addmsg(MsgQueue_t *msgq, int length, ...)
+{
+ struct msgqueue_entry *mq = mqe_alloc(msgq);
+ va_list ap;
+
+ if (mq) {
+ struct msgqueue_entry **mqp;
+ int i;
+
+ va_start(ap, length);
+ for (i = 0; i < length; i++)
+ mq->msg.msg[i] = va_arg(ap, unsigned int);
+ va_end(ap);
+
+ mq->msg.length = length;
+ mq->msg.fifo = 0;
+ mq->next = NULL;
+
+ mqp = &msgq->qe;
+ while (*mqp)
+ mqp = &(*mqp)->next;
+
+ *mqp = mq;
+ }
+
+ return mq != NULL;
+}
+
+/*
+ * Function: void msgqueue_flush(MsgQueue_t *msgq)
+ * Purpose : flush all messages from message queue
+ * Params : msgq - queue to flush
+ */
+void msgqueue_flush(MsgQueue_t *msgq)
+{
+ struct msgqueue_entry *mq, *mqnext;
+
+ for (mq = msgq->qe; mq; mq = mqnext) {
+ mqnext = mq->next;
+ mqe_free(msgq, mq);
+ }
+ msgq->qe = NULL;
+}
+
+EXPORT_SYMBOL(msgqueue_initialise);
+EXPORT_SYMBOL(msgqueue_free);
+EXPORT_SYMBOL(msgqueue_msglength);
+EXPORT_SYMBOL(msgqueue_getmsg);
+EXPORT_SYMBOL(msgqueue_addmsg);
+EXPORT_SYMBOL(msgqueue_flush);
+
+MODULE_AUTHOR("Russell King");
+MODULE_DESCRIPTION("SCSI message queue handling");
+MODULE_LICENSE("GPL");