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path: root/drivers/char/ipmi/ipmi_devintf.c
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Diffstat (limited to 'drivers/char/ipmi/ipmi_devintf.c')
-rw-r--r--drivers/char/ipmi/ipmi_devintf.c582
1 files changed, 582 insertions, 0 deletions
diff --git a/drivers/char/ipmi/ipmi_devintf.c b/drivers/char/ipmi/ipmi_devintf.c
new file mode 100644
index 000000000000..49d67f5384a2
--- /dev/null
+++ b/drivers/char/ipmi/ipmi_devintf.c
@@ -0,0 +1,582 @@
+/*
+ * ipmi_devintf.c
+ *
+ * Linux device interface for the IPMI message handler.
+ *
+ * Author: MontaVista Software, Inc.
+ * Corey Minyard <minyard@mvista.com>
+ * source@mvista.com
+ *
+ * Copyright 2002 MontaVista Software Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ *
+ *
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
+ * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
+ * USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/errno.h>
+#include <asm/system.h>
+#include <linux/sched.h>
+#include <linux/poll.h>
+#include <linux/spinlock.h>
+#include <linux/slab.h>
+#include <linux/devfs_fs_kernel.h>
+#include <linux/ipmi.h>
+#include <asm/semaphore.h>
+#include <linux/init.h>
+
+#define IPMI_DEVINTF_VERSION "v33"
+
+struct ipmi_file_private
+{
+ ipmi_user_t user;
+ spinlock_t recv_msg_lock;
+ struct list_head recv_msgs;
+ struct file *file;
+ struct fasync_struct *fasync_queue;
+ wait_queue_head_t wait;
+ struct semaphore recv_sem;
+ int default_retries;
+ unsigned int default_retry_time_ms;
+};
+
+static void file_receive_handler(struct ipmi_recv_msg *msg,
+ void *handler_data)
+{
+ struct ipmi_file_private *priv = handler_data;
+ int was_empty;
+ unsigned long flags;
+
+ spin_lock_irqsave(&(priv->recv_msg_lock), flags);
+
+ was_empty = list_empty(&(priv->recv_msgs));
+ list_add_tail(&(msg->link), &(priv->recv_msgs));
+
+ if (was_empty) {
+ wake_up_interruptible(&priv->wait);
+ kill_fasync(&priv->fasync_queue, SIGIO, POLL_IN);
+ }
+
+ spin_unlock_irqrestore(&(priv->recv_msg_lock), flags);
+}
+
+static unsigned int ipmi_poll(struct file *file, poll_table *wait)
+{
+ struct ipmi_file_private *priv = file->private_data;
+ unsigned int mask = 0;
+ unsigned long flags;
+
+ poll_wait(file, &priv->wait, wait);
+
+ spin_lock_irqsave(&priv->recv_msg_lock, flags);
+
+ if (! list_empty(&(priv->recv_msgs)))
+ mask |= (POLLIN | POLLRDNORM);
+
+ spin_unlock_irqrestore(&priv->recv_msg_lock, flags);
+
+ return mask;
+}
+
+static int ipmi_fasync(int fd, struct file *file, int on)
+{
+ struct ipmi_file_private *priv = file->private_data;
+ int result;
+
+ result = fasync_helper(fd, file, on, &priv->fasync_queue);
+
+ return (result);
+}
+
+static struct ipmi_user_hndl ipmi_hndlrs =
+{
+ .ipmi_recv_hndl = file_receive_handler,
+};
+
+static int ipmi_open(struct inode *inode, struct file *file)
+{
+ int if_num = iminor(inode);
+ int rv;
+ struct ipmi_file_private *priv;
+
+
+ priv = kmalloc(sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ priv->file = file;
+
+ rv = ipmi_create_user(if_num,
+ &ipmi_hndlrs,
+ priv,
+ &(priv->user));
+ if (rv) {
+ kfree(priv);
+ return rv;
+ }
+
+ file->private_data = priv;
+
+ spin_lock_init(&(priv->recv_msg_lock));
+ INIT_LIST_HEAD(&(priv->recv_msgs));
+ init_waitqueue_head(&priv->wait);
+ priv->fasync_queue = NULL;
+ sema_init(&(priv->recv_sem), 1);
+
+ /* Use the low-level defaults. */
+ priv->default_retries = -1;
+ priv->default_retry_time_ms = 0;
+
+ return 0;
+}
+
+static int ipmi_release(struct inode *inode, struct file *file)
+{
+ struct ipmi_file_private *priv = file->private_data;
+ int rv;
+
+ rv = ipmi_destroy_user(priv->user);
+ if (rv)
+ return rv;
+
+ ipmi_fasync (-1, file, 0);
+
+ /* FIXME - free the messages in the list. */
+ kfree(priv);
+
+ return 0;
+}
+
+static int handle_send_req(ipmi_user_t user,
+ struct ipmi_req *req,
+ int retries,
+ unsigned int retry_time_ms)
+{
+ int rv;
+ struct ipmi_addr addr;
+ struct kernel_ipmi_msg msg;
+
+ if (req->addr_len > sizeof(struct ipmi_addr))
+ return -EINVAL;
+
+ if (copy_from_user(&addr, req->addr, req->addr_len))
+ return -EFAULT;
+
+ msg.netfn = req->msg.netfn;
+ msg.cmd = req->msg.cmd;
+ msg.data_len = req->msg.data_len;
+ msg.data = kmalloc(IPMI_MAX_MSG_LENGTH, GFP_KERNEL);
+ if (!msg.data)
+ return -ENOMEM;
+
+ /* From here out we cannot return, we must jump to "out" for
+ error exits to free msgdata. */
+
+ rv = ipmi_validate_addr(&addr, req->addr_len);
+ if (rv)
+ goto out;
+
+ if (req->msg.data != NULL) {
+ if (req->msg.data_len > IPMI_MAX_MSG_LENGTH) {
+ rv = -EMSGSIZE;
+ goto out;
+ }
+
+ if (copy_from_user(msg.data,
+ req->msg.data,
+ req->msg.data_len))
+ {
+ rv = -EFAULT;
+ goto out;
+ }
+ } else {
+ msg.data_len = 0;
+ }
+
+ rv = ipmi_request_settime(user,
+ &addr,
+ req->msgid,
+ &msg,
+ NULL,
+ 0,
+ retries,
+ retry_time_ms);
+ out:
+ kfree(msg.data);
+ return rv;
+}
+
+static int ipmi_ioctl(struct inode *inode,
+ struct file *file,
+ unsigned int cmd,
+ unsigned long data)
+{
+ int rv = -EINVAL;
+ struct ipmi_file_private *priv = file->private_data;
+ void __user *arg = (void __user *)data;
+
+ switch (cmd)
+ {
+ case IPMICTL_SEND_COMMAND:
+ {
+ struct ipmi_req req;
+
+ if (copy_from_user(&req, arg, sizeof(req))) {
+ rv = -EFAULT;
+ break;
+ }
+
+ rv = handle_send_req(priv->user,
+ &req,
+ priv->default_retries,
+ priv->default_retry_time_ms);
+ break;
+ }
+
+ case IPMICTL_SEND_COMMAND_SETTIME:
+ {
+ struct ipmi_req_settime req;
+
+ if (copy_from_user(&req, arg, sizeof(req))) {
+ rv = -EFAULT;
+ break;
+ }
+
+ rv = handle_send_req(priv->user,
+ &req.req,
+ req.retries,
+ req.retry_time_ms);
+ break;
+ }
+
+ case IPMICTL_RECEIVE_MSG:
+ case IPMICTL_RECEIVE_MSG_TRUNC:
+ {
+ struct ipmi_recv rsp;
+ int addr_len;
+ struct list_head *entry;
+ struct ipmi_recv_msg *msg;
+ unsigned long flags;
+
+
+ rv = 0;
+ if (copy_from_user(&rsp, arg, sizeof(rsp))) {
+ rv = -EFAULT;
+ break;
+ }
+
+ /* We claim a semaphore because we don't want two
+ users getting something from the queue at a time.
+ Since we have to release the spinlock before we can
+ copy the data to the user, it's possible another
+ user will grab something from the queue, too. Then
+ the messages might get out of order if something
+ fails and the message gets put back onto the
+ queue. This semaphore prevents that problem. */
+ down(&(priv->recv_sem));
+
+ /* Grab the message off the list. */
+ spin_lock_irqsave(&(priv->recv_msg_lock), flags);
+ if (list_empty(&(priv->recv_msgs))) {
+ spin_unlock_irqrestore(&(priv->recv_msg_lock), flags);
+ rv = -EAGAIN;
+ goto recv_err;
+ }
+ entry = priv->recv_msgs.next;
+ msg = list_entry(entry, struct ipmi_recv_msg, link);
+ list_del(entry);
+ spin_unlock_irqrestore(&(priv->recv_msg_lock), flags);
+
+ addr_len = ipmi_addr_length(msg->addr.addr_type);
+ if (rsp.addr_len < addr_len)
+ {
+ rv = -EINVAL;
+ goto recv_putback_on_err;
+ }
+
+ if (copy_to_user(rsp.addr, &(msg->addr), addr_len)) {
+ rv = -EFAULT;
+ goto recv_putback_on_err;
+ }
+ rsp.addr_len = addr_len;
+
+ rsp.recv_type = msg->recv_type;
+ rsp.msgid = msg->msgid;
+ rsp.msg.netfn = msg->msg.netfn;
+ rsp.msg.cmd = msg->msg.cmd;
+
+ if (msg->msg.data_len > 0) {
+ if (rsp.msg.data_len < msg->msg.data_len) {
+ rv = -EMSGSIZE;
+ if (cmd == IPMICTL_RECEIVE_MSG_TRUNC) {
+ msg->msg.data_len = rsp.msg.data_len;
+ } else {
+ goto recv_putback_on_err;
+ }
+ }
+
+ if (copy_to_user(rsp.msg.data,
+ msg->msg.data,
+ msg->msg.data_len))
+ {
+ rv = -EFAULT;
+ goto recv_putback_on_err;
+ }
+ rsp.msg.data_len = msg->msg.data_len;
+ } else {
+ rsp.msg.data_len = 0;
+ }
+
+ if (copy_to_user(arg, &rsp, sizeof(rsp))) {
+ rv = -EFAULT;
+ goto recv_putback_on_err;
+ }
+
+ up(&(priv->recv_sem));
+ ipmi_free_recv_msg(msg);
+ break;
+
+ recv_putback_on_err:
+ /* If we got an error, put the message back onto
+ the head of the queue. */
+ spin_lock_irqsave(&(priv->recv_msg_lock), flags);
+ list_add(entry, &(priv->recv_msgs));
+ spin_unlock_irqrestore(&(priv->recv_msg_lock), flags);
+ up(&(priv->recv_sem));
+ break;
+
+ recv_err:
+ up(&(priv->recv_sem));
+ break;
+ }
+
+ case IPMICTL_REGISTER_FOR_CMD:
+ {
+ struct ipmi_cmdspec val;
+
+ if (copy_from_user(&val, arg, sizeof(val))) {
+ rv = -EFAULT;
+ break;
+ }
+
+ rv = ipmi_register_for_cmd(priv->user, val.netfn, val.cmd);
+ break;
+ }
+
+ case IPMICTL_UNREGISTER_FOR_CMD:
+ {
+ struct ipmi_cmdspec val;
+
+ if (copy_from_user(&val, arg, sizeof(val))) {
+ rv = -EFAULT;
+ break;
+ }
+
+ rv = ipmi_unregister_for_cmd(priv->user, val.netfn, val.cmd);
+ break;
+ }
+
+ case IPMICTL_SET_GETS_EVENTS_CMD:
+ {
+ int val;
+
+ if (copy_from_user(&val, arg, sizeof(val))) {
+ rv = -EFAULT;
+ break;
+ }
+
+ rv = ipmi_set_gets_events(priv->user, val);
+ break;
+ }
+
+ case IPMICTL_SET_MY_ADDRESS_CMD:
+ {
+ unsigned int val;
+
+ if (copy_from_user(&val, arg, sizeof(val))) {
+ rv = -EFAULT;
+ break;
+ }
+
+ ipmi_set_my_address(priv->user, val);
+ rv = 0;
+ break;
+ }
+
+ case IPMICTL_GET_MY_ADDRESS_CMD:
+ {
+ unsigned int val;
+
+ val = ipmi_get_my_address(priv->user);
+
+ if (copy_to_user(arg, &val, sizeof(val))) {
+ rv = -EFAULT;
+ break;
+ }
+ rv = 0;
+ break;
+ }
+
+ case IPMICTL_SET_MY_LUN_CMD:
+ {
+ unsigned int val;
+
+ if (copy_from_user(&val, arg, sizeof(val))) {
+ rv = -EFAULT;
+ break;
+ }
+
+ ipmi_set_my_LUN(priv->user, val);
+ rv = 0;
+ break;
+ }
+
+ case IPMICTL_GET_MY_LUN_CMD:
+ {
+ unsigned int val;
+
+ val = ipmi_get_my_LUN(priv->user);
+
+ if (copy_to_user(arg, &val, sizeof(val))) {
+ rv = -EFAULT;
+ break;
+ }
+ rv = 0;
+ break;
+ }
+ case IPMICTL_SET_TIMING_PARMS_CMD:
+ {
+ struct ipmi_timing_parms parms;
+
+ if (copy_from_user(&parms, arg, sizeof(parms))) {
+ rv = -EFAULT;
+ break;
+ }
+
+ priv->default_retries = parms.retries;
+ priv->default_retry_time_ms = parms.retry_time_ms;
+ rv = 0;
+ break;
+ }
+
+ case IPMICTL_GET_TIMING_PARMS_CMD:
+ {
+ struct ipmi_timing_parms parms;
+
+ parms.retries = priv->default_retries;
+ parms.retry_time_ms = priv->default_retry_time_ms;
+
+ if (copy_to_user(arg, &parms, sizeof(parms))) {
+ rv = -EFAULT;
+ break;
+ }
+
+ rv = 0;
+ break;
+ }
+ }
+
+ return rv;
+}
+
+
+static struct file_operations ipmi_fops = {
+ .owner = THIS_MODULE,
+ .ioctl = ipmi_ioctl,
+ .open = ipmi_open,
+ .release = ipmi_release,
+ .fasync = ipmi_fasync,
+ .poll = ipmi_poll,
+};
+
+#define DEVICE_NAME "ipmidev"
+
+static int ipmi_major = 0;
+module_param(ipmi_major, int, 0);
+MODULE_PARM_DESC(ipmi_major, "Sets the major number of the IPMI device. By"
+ " default, or if you set it to zero, it will choose the next"
+ " available device. Setting it to -1 will disable the"
+ " interface. Other values will set the major device number"
+ " to that value.");
+
+static void ipmi_new_smi(int if_num)
+{
+ devfs_mk_cdev(MKDEV(ipmi_major, if_num),
+ S_IFCHR | S_IRUSR | S_IWUSR,
+ "ipmidev/%d", if_num);
+}
+
+static void ipmi_smi_gone(int if_num)
+{
+ devfs_remove("ipmidev/%d", if_num);
+}
+
+static struct ipmi_smi_watcher smi_watcher =
+{
+ .owner = THIS_MODULE,
+ .new_smi = ipmi_new_smi,
+ .smi_gone = ipmi_smi_gone,
+};
+
+static __init int init_ipmi_devintf(void)
+{
+ int rv;
+
+ if (ipmi_major < 0)
+ return -EINVAL;
+
+ printk(KERN_INFO "ipmi device interface version "
+ IPMI_DEVINTF_VERSION "\n");
+
+ rv = register_chrdev(ipmi_major, DEVICE_NAME, &ipmi_fops);
+ if (rv < 0) {
+ printk(KERN_ERR "ipmi: can't get major %d\n", ipmi_major);
+ return rv;
+ }
+
+ if (ipmi_major == 0) {
+ ipmi_major = rv;
+ }
+
+ devfs_mk_dir(DEVICE_NAME);
+
+ rv = ipmi_smi_watcher_register(&smi_watcher);
+ if (rv) {
+ unregister_chrdev(ipmi_major, DEVICE_NAME);
+ printk(KERN_WARNING "ipmi: can't register smi watcher\n");
+ return rv;
+ }
+
+ return 0;
+}
+module_init(init_ipmi_devintf);
+
+static __exit void cleanup_ipmi(void)
+{
+ ipmi_smi_watcher_unregister(&smi_watcher);
+ devfs_remove(DEVICE_NAME);
+ unregister_chrdev(ipmi_major, DEVICE_NAME);
+}
+module_exit(cleanup_ipmi);
+
+MODULE_LICENSE("GPL");
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