/*
- * Copyright (C) 2004,2005 IBM Corporation
- * Interface implementation for communication with the v/VM control program
- * Author(s): Christian Borntraeger <cborntra@de.ibm.com>
+ * Copyright IBM Corp. 2004,2007
+ * Interface implementation for communication with the z/VM control program
+ * Author(s): Christian Borntraeger <borntraeger@de.ibm.com>
*
*
* z/VMs CP offers the possibility to issue commands via the diagnose code 8
* The idea of this driver is based on cpint from Neale Ferguson and #CP in CMS
*/
+#define KMSG_COMPONENT "vmcp"
+#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
+
#include <linux/fs.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/miscdevice.h>
#include <linux/module.h>
+#include <asm/compat.h>
#include <asm/cpcmd.h>
#include <asm/debug.h>
#include <asm/uaccess.h>
#include "vmcp.h"
MODULE_LICENSE("GPL");
-MODULE_AUTHOR("Christian Borntraeger <cborntra@de.ibm.com>");
+MODULE_AUTHOR("Christian Borntraeger <borntraeger@de.ibm.com>");
MODULE_DESCRIPTION("z/VM CP interface");
static debug_info_t *vmcp_debug;
session = kmalloc(sizeof(*session), GFP_KERNEL);
if (!session)
return -ENOMEM;
+
session->bufsize = PAGE_SIZE;
session->response = NULL;
session->resp_size = 0;
- init_MUTEX(&session->mutex);
+ mutex_init(&session->mutex);
file->private_data = session;
return nonseekable_open(inode, file);
}
}
static ssize_t
-vmcp_read(struct file *file, char __user * buff, size_t count, loff_t * ppos)
+vmcp_read(struct file *file, char __user *buff, size_t count, loff_t *ppos)
{
- size_t tocopy;
+ ssize_t ret;
+ size_t size;
struct vmcp_session *session;
- session = (struct vmcp_session *)file->private_data;
- if (down_interruptible(&session->mutex))
+ session = file->private_data;
+ if (mutex_lock_interruptible(&session->mutex))
return -ERESTARTSYS;
if (!session->response) {
- up(&session->mutex);
+ mutex_unlock(&session->mutex);
return 0;
}
- if (*ppos > session->resp_size) {
- up(&session->mutex);
- return 0;
- }
- tocopy = min(session->resp_size - (size_t) (*ppos), count);
- tocopy = min(tocopy,session->bufsize - (size_t) (*ppos));
+ size = min_t(size_t, session->resp_size, session->bufsize);
+ ret = simple_read_from_buffer(buff, count, ppos,
+ session->response, size);
- if (copy_to_user(buff, session->response + (*ppos), tocopy)) {
- up(&session->mutex);
- return -EFAULT;
- }
- up(&session->mutex);
- *ppos += tocopy;
- return tocopy;
+ mutex_unlock(&session->mutex);
+
+ return ret;
}
static ssize_t
-vmcp_write(struct file *file, const char __user * buff, size_t count,
- loff_t * ppos)
+vmcp_write(struct file *file, const char __user *buff, size_t count,
+ loff_t *ppos)
{
char *cmd;
struct vmcp_session *session;
}
cmd[count] = '\0';
session = (struct vmcp_session *)file->private_data;
- if (down_interruptible(&session->mutex)) {
+ if (mutex_lock_interruptible(&session->mutex)) {
kfree(cmd);
return -ERESTARTSYS;
}
if (!session->response)
session->response = (char *)__get_free_pages(GFP_KERNEL
- | __GFP_REPEAT | GFP_DMA,
+ | __GFP_REPEAT | GFP_DMA,
get_order(session->bufsize));
if (!session->response) {
- up(&session->mutex);
+ mutex_unlock(&session->mutex);
kfree(cmd);
return -ENOMEM;
}
debug_text_event(vmcp_debug, 1, cmd);
- session->resp_size = __cpcmd(cmd, session->response,
- session->bufsize,
- &session->resp_code);
- up(&session->mutex);
+ session->resp_size = cpcmd(cmd, session->response, session->bufsize,
+ &session->resp_code);
+ mutex_unlock(&session->mutex);
kfree(cmd);
*ppos = 0; /* reset the file pointer after a command */
return count;
static long vmcp_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
struct vmcp_session *session;
+ int __user *argp;
int temp;
session = (struct vmcp_session *)file->private_data;
- if (down_interruptible(&session->mutex))
+ if (is_compat_task())
+ argp = compat_ptr(arg);
+ else
+ argp = (int __user *)arg;
+ if (mutex_lock_interruptible(&session->mutex))
return -ERESTARTSYS;
switch (cmd) {
case VMCP_GETCODE:
temp = session->resp_code;
- up(&session->mutex);
- return put_user(temp, (int __user *)arg);
+ mutex_unlock(&session->mutex);
+ return put_user(temp, argp);
case VMCP_SETBUF:
free_pages((unsigned long)session->response,
get_order(session->bufsize));
session->response=NULL;
- temp = get_user(session->bufsize, (int __user *)arg);
+ temp = get_user(session->bufsize, argp);
if (get_order(session->bufsize) > 8) {
session->bufsize = PAGE_SIZE;
temp = -EINVAL;
}
- up(&session->mutex);
+ mutex_unlock(&session->mutex);
return temp;
case VMCP_GETSIZE:
temp = session->resp_size;
- up(&session->mutex);
- return put_user(temp, (int __user *)arg);
+ mutex_unlock(&session->mutex);
+ return put_user(temp, argp);
default:
- up(&session->mutex);
+ mutex_unlock(&session->mutex);
return -ENOIOCTLCMD;
}
}
-static struct file_operations vmcp_fops = {
+static const struct file_operations vmcp_fops = {
.owner = THIS_MODULE,
- .open = &vmcp_open,
- .release = &vmcp_release,
- .read = &vmcp_read,
- .llseek = &no_llseek,
- .write = &vmcp_write,
- .unlocked_ioctl = &vmcp_ioctl,
- .compat_ioctl = &vmcp_ioctl
+ .open = vmcp_open,
+ .release = vmcp_release,
+ .read = vmcp_read,
+ .write = vmcp_write,
+ .unlocked_ioctl = vmcp_ioctl,
+ .compat_ioctl = vmcp_ioctl,
};
static struct miscdevice vmcp_dev = {
int ret;
if (!MACHINE_IS_VM) {
- printk(KERN_WARNING
- "z/VM CP interface is only available under z/VM\n");
+ pr_warning("The z/VM CP interface device driver cannot be "
+ "loaded without z/VM\n");
return -ENODEV;
}
- ret = misc_register(&vmcp_dev);
- if (!ret)
- printk(KERN_INFO "z/VM CP interface loaded\n");
- else
- printk(KERN_WARNING
- "z/VM CP interface not loaded. Could not register misc device.\n");
+
vmcp_debug = debug_register("vmcp", 1, 1, 240);
- debug_register_view(vmcp_debug, &debug_hex_ascii_view);
- return ret;
+ if (!vmcp_debug)
+ return -ENOMEM;
+
+ ret = debug_register_view(vmcp_debug, &debug_hex_ascii_view);
+ if (ret) {
+ debug_unregister(vmcp_debug);
+ return ret;
+ }
+
+ ret = misc_register(&vmcp_dev);
+ if (ret) {
+ debug_unregister(vmcp_debug);
+ return ret;
+ }
+
+ return 0;
}
static void __exit vmcp_exit(void)
{
- WARN_ON(misc_deregister(&vmcp_dev) != 0);
+ misc_deregister(&vmcp_dev);
debug_unregister(vmcp_debug);
- printk(KERN_INFO "z/VM CP interface unloaded.\n");
}
module_init(vmcp_init);
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff