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author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 22:20:36 (GMT) |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 22:20:36 (GMT) |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /drivers/char/ipmi/ipmi_devintf.c | |
download | linux-fsl-qoriq-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.xz |
Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
Diffstat (limited to 'drivers/char/ipmi/ipmi_devintf.c')
-rw-r--r-- | drivers/char/ipmi/ipmi_devintf.c | 582 |
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 0000000..49d67f5 --- /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"); |