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908 lines
19 KiB
908 lines
19 KiB
// SPDX-License-Identifier: GPL-2.0+ |
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/* |
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* ipmi_devintf.c |
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* |
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* Linux device interface for the IPMI message handler. |
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* |
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* Author: MontaVista Software, Inc. |
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* Corey Minyard <[email protected]> |
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* [email protected] |
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* |
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* Copyright 2002 MontaVista Software Inc. |
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*/ |
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|
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#include <linux/module.h> |
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#include <linux/moduleparam.h> |
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#include <linux/errno.h> |
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#include <linux/poll.h> |
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#include <linux/sched.h> |
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#include <linux/spinlock.h> |
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#include <linux/slab.h> |
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#include <linux/ipmi.h> |
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#include <linux/mutex.h> |
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#include <linux/init.h> |
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#include <linux/device.h> |
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#include <linux/compat.h> |
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struct ipmi_file_private |
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{ |
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struct ipmi_user *user; |
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spinlock_t recv_msg_lock; |
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struct list_head recv_msgs; |
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struct fasync_struct *fasync_queue; |
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wait_queue_head_t wait; |
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struct mutex recv_mutex; |
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int default_retries; |
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unsigned int default_retry_time_ms; |
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}; |
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|
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static void file_receive_handler(struct ipmi_recv_msg *msg, |
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void *handler_data) |
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{ |
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struct ipmi_file_private *priv = handler_data; |
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int was_empty; |
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unsigned long flags; |
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spin_lock_irqsave(&priv->recv_msg_lock, flags); |
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was_empty = list_empty(&priv->recv_msgs); |
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list_add_tail(&msg->link, &priv->recv_msgs); |
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spin_unlock_irqrestore(&priv->recv_msg_lock, flags); |
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|
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if (was_empty) { |
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wake_up_interruptible(&priv->wait); |
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kill_fasync(&priv->fasync_queue, SIGIO, POLL_IN); |
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} |
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} |
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static __poll_t ipmi_poll(struct file *file, poll_table *wait) |
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{ |
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struct ipmi_file_private *priv = file->private_data; |
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__poll_t mask = 0; |
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unsigned long flags; |
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poll_wait(file, &priv->wait, wait); |
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|
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spin_lock_irqsave(&priv->recv_msg_lock, flags); |
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if (!list_empty(&priv->recv_msgs)) |
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mask |= (EPOLLIN | EPOLLRDNORM); |
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spin_unlock_irqrestore(&priv->recv_msg_lock, flags); |
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return mask; |
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} |
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static int ipmi_fasync(int fd, struct file *file, int on) |
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{ |
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struct ipmi_file_private *priv = file->private_data; |
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return fasync_helper(fd, file, on, &priv->fasync_queue); |
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} |
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static const struct ipmi_user_hndl ipmi_hndlrs = |
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{ |
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.ipmi_recv_hndl = file_receive_handler, |
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}; |
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static int ipmi_open(struct inode *inode, struct file *file) |
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{ |
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int if_num = iminor(inode); |
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int rv; |
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struct ipmi_file_private *priv; |
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priv = kmalloc(sizeof(*priv), GFP_KERNEL); |
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if (!priv) |
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return -ENOMEM; |
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rv = ipmi_create_user(if_num, |
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&ipmi_hndlrs, |
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priv, |
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&priv->user); |
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if (rv) { |
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kfree(priv); |
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goto out; |
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} |
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file->private_data = priv; |
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spin_lock_init(&priv->recv_msg_lock); |
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INIT_LIST_HEAD(&priv->recv_msgs); |
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init_waitqueue_head(&priv->wait); |
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priv->fasync_queue = NULL; |
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mutex_init(&priv->recv_mutex); |
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|
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/* Use the low-level defaults. */ |
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priv->default_retries = -1; |
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priv->default_retry_time_ms = 0; |
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out: |
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return rv; |
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} |
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static int ipmi_release(struct inode *inode, struct file *file) |
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{ |
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struct ipmi_file_private *priv = file->private_data; |
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int rv; |
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struct ipmi_recv_msg *msg, *next; |
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rv = ipmi_destroy_user(priv->user); |
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if (rv) |
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return rv; |
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list_for_each_entry_safe(msg, next, &priv->recv_msgs, link) |
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ipmi_free_recv_msg(msg); |
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kfree(priv); |
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return 0; |
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} |
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static int handle_send_req(struct ipmi_user *user, |
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struct ipmi_req *req, |
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int retries, |
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unsigned int retry_time_ms) |
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{ |
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int rv; |
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struct ipmi_addr addr; |
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struct kernel_ipmi_msg msg; |
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if (req->addr_len > sizeof(struct ipmi_addr)) |
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return -EINVAL; |
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if (copy_from_user(&addr, req->addr, req->addr_len)) |
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return -EFAULT; |
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msg.netfn = req->msg.netfn; |
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msg.cmd = req->msg.cmd; |
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msg.data_len = req->msg.data_len; |
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msg.data = kmalloc(IPMI_MAX_MSG_LENGTH, GFP_KERNEL); |
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if (!msg.data) |
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return -ENOMEM; |
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/* From here out we cannot return, we must jump to "out" for |
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error exits to free msgdata. */ |
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rv = ipmi_validate_addr(&addr, req->addr_len); |
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if (rv) |
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goto out; |
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if (req->msg.data != NULL) { |
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if (req->msg.data_len > IPMI_MAX_MSG_LENGTH) { |
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rv = -EMSGSIZE; |
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goto out; |
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} |
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if (copy_from_user(msg.data, |
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req->msg.data, |
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req->msg.data_len)) { |
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rv = -EFAULT; |
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goto out; |
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} |
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} else { |
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msg.data_len = 0; |
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} |
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rv = ipmi_request_settime(user, |
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&addr, |
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req->msgid, |
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&msg, |
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NULL, |
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0, |
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retries, |
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retry_time_ms); |
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out: |
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kfree(msg.data); |
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return rv; |
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} |
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static int handle_recv(struct ipmi_file_private *priv, |
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bool trunc, struct ipmi_recv *rsp, |
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int (*copyout)(struct ipmi_recv *, void __user *), |
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void __user *to) |
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{ |
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int addr_len; |
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struct list_head *entry; |
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struct ipmi_recv_msg *msg; |
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unsigned long flags; |
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int rv = 0, rv2 = 0; |
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/* We claim a mutex because we don't want two |
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users getting something from the queue at a time. |
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Since we have to release the spinlock before we can |
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copy the data to the user, it's possible another |
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user will grab something from the queue, too. Then |
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the messages might get out of order if something |
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fails and the message gets put back onto the |
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queue. This mutex prevents that problem. */ |
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mutex_lock(&priv->recv_mutex); |
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/* Grab the message off the list. */ |
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spin_lock_irqsave(&priv->recv_msg_lock, flags); |
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if (list_empty(&(priv->recv_msgs))) { |
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spin_unlock_irqrestore(&priv->recv_msg_lock, flags); |
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rv = -EAGAIN; |
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goto recv_err; |
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} |
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entry = priv->recv_msgs.next; |
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msg = list_entry(entry, struct ipmi_recv_msg, link); |
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list_del(entry); |
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spin_unlock_irqrestore(&priv->recv_msg_lock, flags); |
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addr_len = ipmi_addr_length(msg->addr.addr_type); |
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if (rsp->addr_len < addr_len) { |
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rv = -EINVAL; |
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goto recv_putback_on_err; |
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} |
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if (copy_to_user(rsp->addr, &msg->addr, addr_len)) { |
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rv = -EFAULT; |
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goto recv_putback_on_err; |
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} |
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rsp->addr_len = addr_len; |
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rsp->recv_type = msg->recv_type; |
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rsp->msgid = msg->msgid; |
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rsp->msg.netfn = msg->msg.netfn; |
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rsp->msg.cmd = msg->msg.cmd; |
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if (msg->msg.data_len > 0) { |
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if (rsp->msg.data_len < msg->msg.data_len) { |
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rv2 = -EMSGSIZE; |
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if (trunc) |
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msg->msg.data_len = rsp->msg.data_len; |
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else |
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goto recv_putback_on_err; |
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} |
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if (copy_to_user(rsp->msg.data, |
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msg->msg.data, |
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msg->msg.data_len)) { |
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rv = -EFAULT; |
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goto recv_putback_on_err; |
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} |
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rsp->msg.data_len = msg->msg.data_len; |
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} else { |
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rsp->msg.data_len = 0; |
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} |
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rv = copyout(rsp, to); |
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if (rv) |
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goto recv_putback_on_err; |
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mutex_unlock(&priv->recv_mutex); |
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ipmi_free_recv_msg(msg); |
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return rv2; |
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recv_putback_on_err: |
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/* If we got an error, put the message back onto |
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the head of the queue. */ |
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spin_lock_irqsave(&priv->recv_msg_lock, flags); |
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list_add(entry, &priv->recv_msgs); |
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spin_unlock_irqrestore(&priv->recv_msg_lock, flags); |
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recv_err: |
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mutex_unlock(&priv->recv_mutex); |
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return rv; |
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} |
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static int copyout_recv(struct ipmi_recv *rsp, void __user *to) |
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{ |
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return copy_to_user(to, rsp, sizeof(struct ipmi_recv)) ? -EFAULT : 0; |
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} |
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static long ipmi_ioctl(struct file *file, |
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unsigned int cmd, |
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unsigned long data) |
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{ |
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int rv = -EINVAL; |
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struct ipmi_file_private *priv = file->private_data; |
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void __user *arg = (void __user *)data; |
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switch (cmd) |
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{ |
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case IPMICTL_SEND_COMMAND: |
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{ |
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struct ipmi_req req; |
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int retries; |
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unsigned int retry_time_ms; |
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if (copy_from_user(&req, arg, sizeof(req))) { |
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rv = -EFAULT; |
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break; |
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} |
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mutex_lock(&priv->recv_mutex); |
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retries = priv->default_retries; |
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retry_time_ms = priv->default_retry_time_ms; |
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mutex_unlock(&priv->recv_mutex); |
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rv = handle_send_req(priv->user, &req, retries, retry_time_ms); |
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break; |
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} |
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case IPMICTL_SEND_COMMAND_SETTIME: |
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{ |
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struct ipmi_req_settime req; |
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if (copy_from_user(&req, arg, sizeof(req))) { |
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rv = -EFAULT; |
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break; |
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} |
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rv = handle_send_req(priv->user, |
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&req.req, |
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req.retries, |
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req.retry_time_ms); |
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break; |
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} |
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case IPMICTL_RECEIVE_MSG: |
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case IPMICTL_RECEIVE_MSG_TRUNC: |
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{ |
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struct ipmi_recv rsp; |
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if (copy_from_user(&rsp, arg, sizeof(rsp))) |
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rv = -EFAULT; |
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else |
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rv = handle_recv(priv, cmd == IPMICTL_RECEIVE_MSG_TRUNC, |
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&rsp, copyout_recv, arg); |
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break; |
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} |
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case IPMICTL_REGISTER_FOR_CMD: |
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{ |
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struct ipmi_cmdspec val; |
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if (copy_from_user(&val, arg, sizeof(val))) { |
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rv = -EFAULT; |
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break; |
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} |
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rv = ipmi_register_for_cmd(priv->user, val.netfn, val.cmd, |
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IPMI_CHAN_ALL); |
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break; |
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} |
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case IPMICTL_UNREGISTER_FOR_CMD: |
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{ |
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struct ipmi_cmdspec val; |
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if (copy_from_user(&val, arg, sizeof(val))) { |
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rv = -EFAULT; |
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break; |
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} |
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rv = ipmi_unregister_for_cmd(priv->user, val.netfn, val.cmd, |
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IPMI_CHAN_ALL); |
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break; |
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} |
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case IPMICTL_REGISTER_FOR_CMD_CHANS: |
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{ |
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struct ipmi_cmdspec_chans val; |
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if (copy_from_user(&val, arg, sizeof(val))) { |
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rv = -EFAULT; |
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break; |
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} |
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rv = ipmi_register_for_cmd(priv->user, val.netfn, val.cmd, |
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val.chans); |
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break; |
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} |
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case IPMICTL_UNREGISTER_FOR_CMD_CHANS: |
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{ |
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struct ipmi_cmdspec_chans val; |
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if (copy_from_user(&val, arg, sizeof(val))) { |
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rv = -EFAULT; |
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break; |
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} |
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rv = ipmi_unregister_for_cmd(priv->user, val.netfn, val.cmd, |
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val.chans); |
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break; |
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} |
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case IPMICTL_SET_GETS_EVENTS_CMD: |
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{ |
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int val; |
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if (copy_from_user(&val, arg, sizeof(val))) { |
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rv = -EFAULT; |
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break; |
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} |
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rv = ipmi_set_gets_events(priv->user, val); |
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break; |
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} |
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/* The next four are legacy, not per-channel. */ |
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case IPMICTL_SET_MY_ADDRESS_CMD: |
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{ |
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unsigned int val; |
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if (copy_from_user(&val, arg, sizeof(val))) { |
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rv = -EFAULT; |
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break; |
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} |
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rv = ipmi_set_my_address(priv->user, 0, val); |
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break; |
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} |
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case IPMICTL_GET_MY_ADDRESS_CMD: |
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{ |
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unsigned int val; |
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unsigned char rval; |
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rv = ipmi_get_my_address(priv->user, 0, &rval); |
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if (rv) |
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break; |
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val = rval; |
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if (copy_to_user(arg, &val, sizeof(val))) { |
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rv = -EFAULT; |
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break; |
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} |
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break; |
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} |
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case IPMICTL_SET_MY_LUN_CMD: |
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{ |
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unsigned int val; |
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if (copy_from_user(&val, arg, sizeof(val))) { |
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rv = -EFAULT; |
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break; |
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} |
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rv = ipmi_set_my_LUN(priv->user, 0, val); |
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break; |
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} |
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case IPMICTL_GET_MY_LUN_CMD: |
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{ |
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unsigned int val; |
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unsigned char rval; |
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rv = ipmi_get_my_LUN(priv->user, 0, &rval); |
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if (rv) |
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break; |
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val = rval; |
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if (copy_to_user(arg, &val, sizeof(val))) { |
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rv = -EFAULT; |
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break; |
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} |
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break; |
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} |
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case IPMICTL_SET_MY_CHANNEL_ADDRESS_CMD: |
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{ |
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struct ipmi_channel_lun_address_set val; |
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if (copy_from_user(&val, arg, sizeof(val))) { |
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rv = -EFAULT; |
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break; |
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} |
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return ipmi_set_my_address(priv->user, val.channel, val.value); |
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} |
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case IPMICTL_GET_MY_CHANNEL_ADDRESS_CMD: |
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{ |
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struct ipmi_channel_lun_address_set val; |
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if (copy_from_user(&val, arg, sizeof(val))) { |
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rv = -EFAULT; |
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break; |
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} |
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rv = ipmi_get_my_address(priv->user, val.channel, &val.value); |
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if (rv) |
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break; |
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if (copy_to_user(arg, &val, sizeof(val))) { |
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rv = -EFAULT; |
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break; |
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} |
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break; |
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} |
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case IPMICTL_SET_MY_CHANNEL_LUN_CMD: |
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{ |
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struct ipmi_channel_lun_address_set val; |
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if (copy_from_user(&val, arg, sizeof(val))) { |
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rv = -EFAULT; |
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break; |
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} |
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rv = ipmi_set_my_LUN(priv->user, val.channel, val.value); |
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break; |
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} |
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case IPMICTL_GET_MY_CHANNEL_LUN_CMD: |
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{ |
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struct ipmi_channel_lun_address_set val; |
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if (copy_from_user(&val, arg, sizeof(val))) { |
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rv = -EFAULT; |
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break; |
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} |
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rv = ipmi_get_my_LUN(priv->user, val.channel, &val.value); |
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if (rv) |
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break; |
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if (copy_to_user(arg, &val, sizeof(val))) { |
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rv = -EFAULT; |
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break; |
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} |
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break; |
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} |
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|
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case IPMICTL_SET_TIMING_PARMS_CMD: |
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{ |
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struct ipmi_timing_parms parms; |
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if (copy_from_user(&parms, arg, sizeof(parms))) { |
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rv = -EFAULT; |
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break; |
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} |
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|
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mutex_lock(&priv->recv_mutex); |
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priv->default_retries = parms.retries; |
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priv->default_retry_time_ms = parms.retry_time_ms; |
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mutex_unlock(&priv->recv_mutex); |
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rv = 0; |
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break; |
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} |
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|
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case IPMICTL_GET_TIMING_PARMS_CMD: |
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{ |
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struct ipmi_timing_parms parms; |
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|
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mutex_lock(&priv->recv_mutex); |
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parms.retries = priv->default_retries; |
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parms.retry_time_ms = priv->default_retry_time_ms; |
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mutex_unlock(&priv->recv_mutex); |
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|
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if (copy_to_user(arg, &parms, sizeof(parms))) { |
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rv = -EFAULT; |
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break; |
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} |
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|
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rv = 0; |
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break; |
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} |
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|
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case IPMICTL_GET_MAINTENANCE_MODE_CMD: |
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{ |
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int mode; |
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|
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mode = ipmi_get_maintenance_mode(priv->user); |
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if (copy_to_user(arg, &mode, sizeof(mode))) { |
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rv = -EFAULT; |
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break; |
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} |
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rv = 0; |
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break; |
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} |
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|
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case IPMICTL_SET_MAINTENANCE_MODE_CMD: |
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{ |
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int mode; |
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|
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if (copy_from_user(&mode, arg, sizeof(mode))) { |
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rv = -EFAULT; |
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break; |
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} |
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rv = ipmi_set_maintenance_mode(priv->user, mode); |
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break; |
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} |
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|
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default: |
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rv = -ENOTTY; |
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break; |
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} |
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|
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return rv; |
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} |
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|
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#ifdef CONFIG_COMPAT |
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/* |
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* The following code contains code for supporting 32-bit compatible |
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* ioctls on 64-bit kernels. This allows running 32-bit apps on the |
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* 64-bit kernel |
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*/ |
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#define COMPAT_IPMICTL_SEND_COMMAND \ |
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_IOR(IPMI_IOC_MAGIC, 13, struct compat_ipmi_req) |
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#define COMPAT_IPMICTL_SEND_COMMAND_SETTIME \ |
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_IOR(IPMI_IOC_MAGIC, 21, struct compat_ipmi_req_settime) |
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#define COMPAT_IPMICTL_RECEIVE_MSG \ |
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_IOWR(IPMI_IOC_MAGIC, 12, struct compat_ipmi_recv) |
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#define COMPAT_IPMICTL_RECEIVE_MSG_TRUNC \ |
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_IOWR(IPMI_IOC_MAGIC, 11, struct compat_ipmi_recv) |
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|
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struct compat_ipmi_msg { |
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u8 netfn; |
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u8 cmd; |
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u16 data_len; |
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compat_uptr_t data; |
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}; |
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|
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struct compat_ipmi_req { |
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compat_uptr_t addr; |
|
compat_uint_t addr_len; |
|
compat_long_t msgid; |
|
struct compat_ipmi_msg msg; |
|
}; |
|
|
|
struct compat_ipmi_recv { |
|
compat_int_t recv_type; |
|
compat_uptr_t addr; |
|
compat_uint_t addr_len; |
|
compat_long_t msgid; |
|
struct compat_ipmi_msg msg; |
|
}; |
|
|
|
struct compat_ipmi_req_settime { |
|
struct compat_ipmi_req req; |
|
compat_int_t retries; |
|
compat_uint_t retry_time_ms; |
|
}; |
|
|
|
/* |
|
* Define some helper functions for copying IPMI data |
|
*/ |
|
static void get_compat_ipmi_msg(struct ipmi_msg *p64, |
|
struct compat_ipmi_msg *p32) |
|
{ |
|
p64->netfn = p32->netfn; |
|
p64->cmd = p32->cmd; |
|
p64->data_len = p32->data_len; |
|
p64->data = compat_ptr(p32->data); |
|
} |
|
|
|
static void get_compat_ipmi_req(struct ipmi_req *p64, |
|
struct compat_ipmi_req *p32) |
|
{ |
|
p64->addr = compat_ptr(p32->addr); |
|
p64->addr_len = p32->addr_len; |
|
p64->msgid = p32->msgid; |
|
get_compat_ipmi_msg(&p64->msg, &p32->msg); |
|
} |
|
|
|
static void get_compat_ipmi_req_settime(struct ipmi_req_settime *p64, |
|
struct compat_ipmi_req_settime *p32) |
|
{ |
|
get_compat_ipmi_req(&p64->req, &p32->req); |
|
p64->retries = p32->retries; |
|
p64->retry_time_ms = p32->retry_time_ms; |
|
} |
|
|
|
static void get_compat_ipmi_recv(struct ipmi_recv *p64, |
|
struct compat_ipmi_recv *p32) |
|
{ |
|
memset(p64, 0, sizeof(struct ipmi_recv)); |
|
p64->recv_type = p32->recv_type; |
|
p64->addr = compat_ptr(p32->addr); |
|
p64->addr_len = p32->addr_len; |
|
p64->msgid = p32->msgid; |
|
get_compat_ipmi_msg(&p64->msg, &p32->msg); |
|
} |
|
|
|
static int copyout_recv32(struct ipmi_recv *p64, void __user *to) |
|
{ |
|
struct compat_ipmi_recv v32; |
|
memset(&v32, 0, sizeof(struct compat_ipmi_recv)); |
|
v32.recv_type = p64->recv_type; |
|
v32.addr = ptr_to_compat(p64->addr); |
|
v32.addr_len = p64->addr_len; |
|
v32.msgid = p64->msgid; |
|
v32.msg.netfn = p64->msg.netfn; |
|
v32.msg.cmd = p64->msg.cmd; |
|
v32.msg.data_len = p64->msg.data_len; |
|
v32.msg.data = ptr_to_compat(p64->msg.data); |
|
return copy_to_user(to, &v32, sizeof(v32)) ? -EFAULT : 0; |
|
} |
|
|
|
/* |
|
* Handle compatibility ioctls |
|
*/ |
|
static long compat_ipmi_ioctl(struct file *filep, unsigned int cmd, |
|
unsigned long arg) |
|
{ |
|
struct ipmi_file_private *priv = filep->private_data; |
|
|
|
switch(cmd) { |
|
case COMPAT_IPMICTL_SEND_COMMAND: |
|
{ |
|
struct ipmi_req rp; |
|
struct compat_ipmi_req r32; |
|
int retries; |
|
unsigned int retry_time_ms; |
|
|
|
if (copy_from_user(&r32, compat_ptr(arg), sizeof(r32))) |
|
return -EFAULT; |
|
|
|
get_compat_ipmi_req(&rp, &r32); |
|
|
|
mutex_lock(&priv->recv_mutex); |
|
retries = priv->default_retries; |
|
retry_time_ms = priv->default_retry_time_ms; |
|
mutex_unlock(&priv->recv_mutex); |
|
|
|
return handle_send_req(priv->user, &rp, |
|
retries, retry_time_ms); |
|
} |
|
case COMPAT_IPMICTL_SEND_COMMAND_SETTIME: |
|
{ |
|
struct ipmi_req_settime sp; |
|
struct compat_ipmi_req_settime sp32; |
|
|
|
if (copy_from_user(&sp32, compat_ptr(arg), sizeof(sp32))) |
|
return -EFAULT; |
|
|
|
get_compat_ipmi_req_settime(&sp, &sp32); |
|
|
|
return handle_send_req(priv->user, &sp.req, |
|
sp.retries, sp.retry_time_ms); |
|
} |
|
case COMPAT_IPMICTL_RECEIVE_MSG: |
|
case COMPAT_IPMICTL_RECEIVE_MSG_TRUNC: |
|
{ |
|
struct ipmi_recv recv64; |
|
struct compat_ipmi_recv recv32; |
|
|
|
if (copy_from_user(&recv32, compat_ptr(arg), sizeof(recv32))) |
|
return -EFAULT; |
|
|
|
get_compat_ipmi_recv(&recv64, &recv32); |
|
|
|
return handle_recv(priv, |
|
cmd == COMPAT_IPMICTL_RECEIVE_MSG_TRUNC, |
|
&recv64, copyout_recv32, compat_ptr(arg)); |
|
} |
|
default: |
|
return ipmi_ioctl(filep, cmd, arg); |
|
} |
|
} |
|
#endif |
|
|
|
static const struct file_operations ipmi_fops = { |
|
.owner = THIS_MODULE, |
|
.unlocked_ioctl = ipmi_ioctl, |
|
#ifdef CONFIG_COMPAT |
|
.compat_ioctl = compat_ipmi_ioctl, |
|
#endif |
|
.open = ipmi_open, |
|
.release = ipmi_release, |
|
.fasync = ipmi_fasync, |
|
.poll = ipmi_poll, |
|
.llseek = noop_llseek, |
|
}; |
|
|
|
#define DEVICE_NAME "ipmidev" |
|
|
|
static int ipmi_major; |
|
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."); |
|
|
|
/* Keep track of the devices that are registered. */ |
|
struct ipmi_reg_list { |
|
dev_t dev; |
|
struct list_head link; |
|
}; |
|
static LIST_HEAD(reg_list); |
|
static DEFINE_MUTEX(reg_list_mutex); |
|
|
|
static struct class *ipmi_class; |
|
|
|
static void ipmi_new_smi(int if_num, struct device *device) |
|
{ |
|
dev_t dev = MKDEV(ipmi_major, if_num); |
|
struct ipmi_reg_list *entry; |
|
|
|
entry = kmalloc(sizeof(*entry), GFP_KERNEL); |
|
if (!entry) { |
|
pr_err("ipmi_devintf: Unable to create the ipmi class device link\n"); |
|
return; |
|
} |
|
entry->dev = dev; |
|
|
|
mutex_lock(®_list_mutex); |
|
device_create(ipmi_class, device, dev, NULL, "ipmi%d", if_num); |
|
list_add(&entry->link, ®_list); |
|
mutex_unlock(®_list_mutex); |
|
} |
|
|
|
static void ipmi_smi_gone(int if_num) |
|
{ |
|
dev_t dev = MKDEV(ipmi_major, if_num); |
|
struct ipmi_reg_list *entry; |
|
|
|
mutex_lock(®_list_mutex); |
|
list_for_each_entry(entry, ®_list, link) { |
|
if (entry->dev == dev) { |
|
list_del(&entry->link); |
|
kfree(entry); |
|
break; |
|
} |
|
} |
|
device_destroy(ipmi_class, dev); |
|
mutex_unlock(®_list_mutex); |
|
} |
|
|
|
static struct ipmi_smi_watcher smi_watcher = |
|
{ |
|
.owner = THIS_MODULE, |
|
.new_smi = ipmi_new_smi, |
|
.smi_gone = ipmi_smi_gone, |
|
}; |
|
|
|
static int __init init_ipmi_devintf(void) |
|
{ |
|
int rv; |
|
|
|
if (ipmi_major < 0) |
|
return -EINVAL; |
|
|
|
pr_info("ipmi device interface\n"); |
|
|
|
ipmi_class = class_create(THIS_MODULE, "ipmi"); |
|
if (IS_ERR(ipmi_class)) { |
|
pr_err("ipmi: can't register device class\n"); |
|
return PTR_ERR(ipmi_class); |
|
} |
|
|
|
rv = register_chrdev(ipmi_major, DEVICE_NAME, &ipmi_fops); |
|
if (rv < 0) { |
|
class_destroy(ipmi_class); |
|
pr_err("ipmi: can't get major %d\n", ipmi_major); |
|
return rv; |
|
} |
|
|
|
if (ipmi_major == 0) { |
|
ipmi_major = rv; |
|
} |
|
|
|
rv = ipmi_smi_watcher_register(&smi_watcher); |
|
if (rv) { |
|
unregister_chrdev(ipmi_major, DEVICE_NAME); |
|
class_destroy(ipmi_class); |
|
pr_warn("ipmi: can't register smi watcher\n"); |
|
return rv; |
|
} |
|
|
|
return 0; |
|
} |
|
module_init(init_ipmi_devintf); |
|
|
|
static void __exit cleanup_ipmi(void) |
|
{ |
|
struct ipmi_reg_list *entry, *entry2; |
|
mutex_lock(®_list_mutex); |
|
list_for_each_entry_safe(entry, entry2, ®_list, link) { |
|
list_del(&entry->link); |
|
device_destroy(ipmi_class, entry->dev); |
|
kfree(entry); |
|
} |
|
mutex_unlock(®_list_mutex); |
|
class_destroy(ipmi_class); |
|
ipmi_smi_watcher_unregister(&smi_watcher); |
|
unregister_chrdev(ipmi_major, DEVICE_NAME); |
|
} |
|
module_exit(cleanup_ipmi); |
|
|
|
MODULE_LICENSE("GPL"); |
|
MODULE_AUTHOR("Corey Minyard <[email protected]>"); |
|
MODULE_DESCRIPTION("Linux device interface for the IPMI message handler.");
|
|
|