mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-10-30 08:02:30 +00:00
7c0f6ba682
This was entirely automated, using the script by Al: PATT='^[[:blank:]]*#[[:blank:]]*include[[:blank:]]*<asm/uaccess.h>' sed -i -e "s!$PATT!#include <linux/uaccess.h>!" \ $(git grep -l "$PATT"|grep -v ^include/linux/uaccess.h) to do the replacement at the end of the merge window. Requested-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
629 lines
15 KiB
C
629 lines
15 KiB
C
/*
|
|
* IBM ASM Service Processor Device Driver
|
|
*
|
|
* 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 program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
|
|
*
|
|
* Copyright (C) IBM Corporation, 2004
|
|
*
|
|
* Author: Max Asböck <amax@us.ibm.com>
|
|
*
|
|
*/
|
|
|
|
/*
|
|
* Parts of this code are based on an article by Jonathan Corbet
|
|
* that appeared in Linux Weekly News.
|
|
*/
|
|
|
|
|
|
/*
|
|
* The IBMASM file virtual filesystem. It creates the following hierarchy
|
|
* dynamically when mounted from user space:
|
|
*
|
|
* /ibmasm
|
|
* |-- 0
|
|
* | |-- command
|
|
* | |-- event
|
|
* | |-- reverse_heartbeat
|
|
* | `-- remote_video
|
|
* | |-- depth
|
|
* | |-- height
|
|
* | `-- width
|
|
* .
|
|
* .
|
|
* .
|
|
* `-- n
|
|
* |-- command
|
|
* |-- event
|
|
* |-- reverse_heartbeat
|
|
* `-- remote_video
|
|
* |-- depth
|
|
* |-- height
|
|
* `-- width
|
|
*
|
|
* For each service processor the following files are created:
|
|
*
|
|
* command: execute dot commands
|
|
* write: execute a dot command on the service processor
|
|
* read: return the result of a previously executed dot command
|
|
*
|
|
* events: listen for service processor events
|
|
* read: sleep (interruptible) until an event occurs
|
|
* write: wakeup sleeping event listener
|
|
*
|
|
* reverse_heartbeat: send a heartbeat to the service processor
|
|
* read: sleep (interruptible) until the reverse heartbeat fails
|
|
* write: wakeup sleeping heartbeat listener
|
|
*
|
|
* remote_video/width
|
|
* remote_video/height
|
|
* remote_video/width: control remote display settings
|
|
* write: set value
|
|
* read: read value
|
|
*/
|
|
|
|
#include <linux/fs.h>
|
|
#include <linux/pagemap.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/uaccess.h>
|
|
#include <asm/io.h>
|
|
#include "ibmasm.h"
|
|
#include "remote.h"
|
|
#include "dot_command.h"
|
|
|
|
#define IBMASMFS_MAGIC 0x66726f67
|
|
|
|
static LIST_HEAD(service_processors);
|
|
|
|
static struct inode *ibmasmfs_make_inode(struct super_block *sb, int mode);
|
|
static void ibmasmfs_create_files (struct super_block *sb);
|
|
static int ibmasmfs_fill_super (struct super_block *sb, void *data, int silent);
|
|
|
|
|
|
static struct dentry *ibmasmfs_mount(struct file_system_type *fst,
|
|
int flags, const char *name, void *data)
|
|
{
|
|
return mount_single(fst, flags, data, ibmasmfs_fill_super);
|
|
}
|
|
|
|
static const struct super_operations ibmasmfs_s_ops = {
|
|
.statfs = simple_statfs,
|
|
.drop_inode = generic_delete_inode,
|
|
};
|
|
|
|
static const struct file_operations *ibmasmfs_dir_ops = &simple_dir_operations;
|
|
|
|
static struct file_system_type ibmasmfs_type = {
|
|
.owner = THIS_MODULE,
|
|
.name = "ibmasmfs",
|
|
.mount = ibmasmfs_mount,
|
|
.kill_sb = kill_litter_super,
|
|
};
|
|
MODULE_ALIAS_FS("ibmasmfs");
|
|
|
|
static int ibmasmfs_fill_super (struct super_block *sb, void *data, int silent)
|
|
{
|
|
struct inode *root;
|
|
|
|
sb->s_blocksize = PAGE_SIZE;
|
|
sb->s_blocksize_bits = PAGE_SHIFT;
|
|
sb->s_magic = IBMASMFS_MAGIC;
|
|
sb->s_op = &ibmasmfs_s_ops;
|
|
sb->s_time_gran = 1;
|
|
|
|
root = ibmasmfs_make_inode (sb, S_IFDIR | 0500);
|
|
if (!root)
|
|
return -ENOMEM;
|
|
|
|
root->i_op = &simple_dir_inode_operations;
|
|
root->i_fop = ibmasmfs_dir_ops;
|
|
|
|
sb->s_root = d_make_root(root);
|
|
if (!sb->s_root)
|
|
return -ENOMEM;
|
|
|
|
ibmasmfs_create_files(sb);
|
|
return 0;
|
|
}
|
|
|
|
static struct inode *ibmasmfs_make_inode(struct super_block *sb, int mode)
|
|
{
|
|
struct inode *ret = new_inode(sb);
|
|
|
|
if (ret) {
|
|
ret->i_ino = get_next_ino();
|
|
ret->i_mode = mode;
|
|
ret->i_atime = ret->i_mtime = ret->i_ctime = current_time(ret);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static struct dentry *ibmasmfs_create_file(struct dentry *parent,
|
|
const char *name,
|
|
const struct file_operations *fops,
|
|
void *data,
|
|
int mode)
|
|
{
|
|
struct dentry *dentry;
|
|
struct inode *inode;
|
|
|
|
dentry = d_alloc_name(parent, name);
|
|
if (!dentry)
|
|
return NULL;
|
|
|
|
inode = ibmasmfs_make_inode(parent->d_sb, S_IFREG | mode);
|
|
if (!inode) {
|
|
dput(dentry);
|
|
return NULL;
|
|
}
|
|
|
|
inode->i_fop = fops;
|
|
inode->i_private = data;
|
|
|
|
d_add(dentry, inode);
|
|
return dentry;
|
|
}
|
|
|
|
static struct dentry *ibmasmfs_create_dir(struct dentry *parent,
|
|
const char *name)
|
|
{
|
|
struct dentry *dentry;
|
|
struct inode *inode;
|
|
|
|
dentry = d_alloc_name(parent, name);
|
|
if (!dentry)
|
|
return NULL;
|
|
|
|
inode = ibmasmfs_make_inode(parent->d_sb, S_IFDIR | 0500);
|
|
if (!inode) {
|
|
dput(dentry);
|
|
return NULL;
|
|
}
|
|
|
|
inode->i_op = &simple_dir_inode_operations;
|
|
inode->i_fop = ibmasmfs_dir_ops;
|
|
|
|
d_add(dentry, inode);
|
|
return dentry;
|
|
}
|
|
|
|
int ibmasmfs_register(void)
|
|
{
|
|
return register_filesystem(&ibmasmfs_type);
|
|
}
|
|
|
|
void ibmasmfs_unregister(void)
|
|
{
|
|
unregister_filesystem(&ibmasmfs_type);
|
|
}
|
|
|
|
void ibmasmfs_add_sp(struct service_processor *sp)
|
|
{
|
|
list_add(&sp->node, &service_processors);
|
|
}
|
|
|
|
/* struct to save state between command file operations */
|
|
struct ibmasmfs_command_data {
|
|
struct service_processor *sp;
|
|
struct command *command;
|
|
};
|
|
|
|
/* struct to save state between event file operations */
|
|
struct ibmasmfs_event_data {
|
|
struct service_processor *sp;
|
|
struct event_reader reader;
|
|
int active;
|
|
};
|
|
|
|
/* struct to save state between reverse heartbeat file operations */
|
|
struct ibmasmfs_heartbeat_data {
|
|
struct service_processor *sp;
|
|
struct reverse_heartbeat heartbeat;
|
|
int active;
|
|
};
|
|
|
|
static int command_file_open(struct inode *inode, struct file *file)
|
|
{
|
|
struct ibmasmfs_command_data *command_data;
|
|
|
|
if (!inode->i_private)
|
|
return -ENODEV;
|
|
|
|
command_data = kmalloc(sizeof(struct ibmasmfs_command_data), GFP_KERNEL);
|
|
if (!command_data)
|
|
return -ENOMEM;
|
|
|
|
command_data->command = NULL;
|
|
command_data->sp = inode->i_private;
|
|
file->private_data = command_data;
|
|
return 0;
|
|
}
|
|
|
|
static int command_file_close(struct inode *inode, struct file *file)
|
|
{
|
|
struct ibmasmfs_command_data *command_data = file->private_data;
|
|
|
|
if (command_data->command)
|
|
command_put(command_data->command);
|
|
|
|
kfree(command_data);
|
|
return 0;
|
|
}
|
|
|
|
static ssize_t command_file_read(struct file *file, char __user *buf, size_t count, loff_t *offset)
|
|
{
|
|
struct ibmasmfs_command_data *command_data = file->private_data;
|
|
struct command *cmd;
|
|
int len;
|
|
unsigned long flags;
|
|
|
|
if (*offset < 0)
|
|
return -EINVAL;
|
|
if (count == 0 || count > IBMASM_CMD_MAX_BUFFER_SIZE)
|
|
return 0;
|
|
if (*offset != 0)
|
|
return 0;
|
|
|
|
spin_lock_irqsave(&command_data->sp->lock, flags);
|
|
cmd = command_data->command;
|
|
if (cmd == NULL) {
|
|
spin_unlock_irqrestore(&command_data->sp->lock, flags);
|
|
return 0;
|
|
}
|
|
command_data->command = NULL;
|
|
spin_unlock_irqrestore(&command_data->sp->lock, flags);
|
|
|
|
if (cmd->status != IBMASM_CMD_COMPLETE) {
|
|
command_put(cmd);
|
|
return -EIO;
|
|
}
|
|
len = min(count, cmd->buffer_size);
|
|
if (copy_to_user(buf, cmd->buffer, len)) {
|
|
command_put(cmd);
|
|
return -EFAULT;
|
|
}
|
|
command_put(cmd);
|
|
|
|
return len;
|
|
}
|
|
|
|
static ssize_t command_file_write(struct file *file, const char __user *ubuff, size_t count, loff_t *offset)
|
|
{
|
|
struct ibmasmfs_command_data *command_data = file->private_data;
|
|
struct command *cmd;
|
|
unsigned long flags;
|
|
|
|
if (*offset < 0)
|
|
return -EINVAL;
|
|
if (count == 0 || count > IBMASM_CMD_MAX_BUFFER_SIZE)
|
|
return 0;
|
|
if (*offset != 0)
|
|
return 0;
|
|
|
|
/* commands are executed sequentially, only one command at a time */
|
|
if (command_data->command)
|
|
return -EAGAIN;
|
|
|
|
cmd = ibmasm_new_command(command_data->sp, count);
|
|
if (!cmd)
|
|
return -ENOMEM;
|
|
|
|
if (copy_from_user(cmd->buffer, ubuff, count)) {
|
|
command_put(cmd);
|
|
return -EFAULT;
|
|
}
|
|
|
|
spin_lock_irqsave(&command_data->sp->lock, flags);
|
|
if (command_data->command) {
|
|
spin_unlock_irqrestore(&command_data->sp->lock, flags);
|
|
command_put(cmd);
|
|
return -EAGAIN;
|
|
}
|
|
command_data->command = cmd;
|
|
spin_unlock_irqrestore(&command_data->sp->lock, flags);
|
|
|
|
ibmasm_exec_command(command_data->sp, cmd);
|
|
ibmasm_wait_for_response(cmd, get_dot_command_timeout(cmd->buffer));
|
|
|
|
return count;
|
|
}
|
|
|
|
static int event_file_open(struct inode *inode, struct file *file)
|
|
{
|
|
struct ibmasmfs_event_data *event_data;
|
|
struct service_processor *sp;
|
|
|
|
if (!inode->i_private)
|
|
return -ENODEV;
|
|
|
|
sp = inode->i_private;
|
|
|
|
event_data = kmalloc(sizeof(struct ibmasmfs_event_data), GFP_KERNEL);
|
|
if (!event_data)
|
|
return -ENOMEM;
|
|
|
|
ibmasm_event_reader_register(sp, &event_data->reader);
|
|
|
|
event_data->sp = sp;
|
|
event_data->active = 0;
|
|
file->private_data = event_data;
|
|
return 0;
|
|
}
|
|
|
|
static int event_file_close(struct inode *inode, struct file *file)
|
|
{
|
|
struct ibmasmfs_event_data *event_data = file->private_data;
|
|
|
|
ibmasm_event_reader_unregister(event_data->sp, &event_data->reader);
|
|
kfree(event_data);
|
|
return 0;
|
|
}
|
|
|
|
static ssize_t event_file_read(struct file *file, char __user *buf, size_t count, loff_t *offset)
|
|
{
|
|
struct ibmasmfs_event_data *event_data = file->private_data;
|
|
struct event_reader *reader = &event_data->reader;
|
|
struct service_processor *sp = event_data->sp;
|
|
int ret;
|
|
unsigned long flags;
|
|
|
|
if (*offset < 0)
|
|
return -EINVAL;
|
|
if (count == 0 || count > IBMASM_EVENT_MAX_SIZE)
|
|
return 0;
|
|
if (*offset != 0)
|
|
return 0;
|
|
|
|
spin_lock_irqsave(&sp->lock, flags);
|
|
if (event_data->active) {
|
|
spin_unlock_irqrestore(&sp->lock, flags);
|
|
return -EBUSY;
|
|
}
|
|
event_data->active = 1;
|
|
spin_unlock_irqrestore(&sp->lock, flags);
|
|
|
|
ret = ibmasm_get_next_event(sp, reader);
|
|
if (ret <= 0)
|
|
goto out;
|
|
|
|
if (count < reader->data_size) {
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
if (copy_to_user(buf, reader->data, reader->data_size)) {
|
|
ret = -EFAULT;
|
|
goto out;
|
|
}
|
|
ret = reader->data_size;
|
|
|
|
out:
|
|
event_data->active = 0;
|
|
return ret;
|
|
}
|
|
|
|
static ssize_t event_file_write(struct file *file, const char __user *buf, size_t count, loff_t *offset)
|
|
{
|
|
struct ibmasmfs_event_data *event_data = file->private_data;
|
|
|
|
if (*offset < 0)
|
|
return -EINVAL;
|
|
if (count != 1)
|
|
return 0;
|
|
if (*offset != 0)
|
|
return 0;
|
|
|
|
ibmasm_cancel_next_event(&event_data->reader);
|
|
return 0;
|
|
}
|
|
|
|
static int r_heartbeat_file_open(struct inode *inode, struct file *file)
|
|
{
|
|
struct ibmasmfs_heartbeat_data *rhbeat;
|
|
|
|
if (!inode->i_private)
|
|
return -ENODEV;
|
|
|
|
rhbeat = kmalloc(sizeof(struct ibmasmfs_heartbeat_data), GFP_KERNEL);
|
|
if (!rhbeat)
|
|
return -ENOMEM;
|
|
|
|
rhbeat->sp = inode->i_private;
|
|
rhbeat->active = 0;
|
|
ibmasm_init_reverse_heartbeat(rhbeat->sp, &rhbeat->heartbeat);
|
|
file->private_data = rhbeat;
|
|
return 0;
|
|
}
|
|
|
|
static int r_heartbeat_file_close(struct inode *inode, struct file *file)
|
|
{
|
|
struct ibmasmfs_heartbeat_data *rhbeat = file->private_data;
|
|
|
|
kfree(rhbeat);
|
|
return 0;
|
|
}
|
|
|
|
static ssize_t r_heartbeat_file_read(struct file *file, char __user *buf, size_t count, loff_t *offset)
|
|
{
|
|
struct ibmasmfs_heartbeat_data *rhbeat = file->private_data;
|
|
unsigned long flags;
|
|
int result;
|
|
|
|
if (*offset < 0)
|
|
return -EINVAL;
|
|
if (count == 0 || count > 1024)
|
|
return 0;
|
|
if (*offset != 0)
|
|
return 0;
|
|
|
|
/* allow only one reverse heartbeat per process */
|
|
spin_lock_irqsave(&rhbeat->sp->lock, flags);
|
|
if (rhbeat->active) {
|
|
spin_unlock_irqrestore(&rhbeat->sp->lock, flags);
|
|
return -EBUSY;
|
|
}
|
|
rhbeat->active = 1;
|
|
spin_unlock_irqrestore(&rhbeat->sp->lock, flags);
|
|
|
|
result = ibmasm_start_reverse_heartbeat(rhbeat->sp, &rhbeat->heartbeat);
|
|
rhbeat->active = 0;
|
|
|
|
return result;
|
|
}
|
|
|
|
static ssize_t r_heartbeat_file_write(struct file *file, const char __user *buf, size_t count, loff_t *offset)
|
|
{
|
|
struct ibmasmfs_heartbeat_data *rhbeat = file->private_data;
|
|
|
|
if (*offset < 0)
|
|
return -EINVAL;
|
|
if (count != 1)
|
|
return 0;
|
|
if (*offset != 0)
|
|
return 0;
|
|
|
|
if (rhbeat->active)
|
|
ibmasm_stop_reverse_heartbeat(&rhbeat->heartbeat);
|
|
|
|
return 1;
|
|
}
|
|
|
|
static int remote_settings_file_close(struct inode *inode, struct file *file)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static ssize_t remote_settings_file_read(struct file *file, char __user *buf, size_t count, loff_t *offset)
|
|
{
|
|
void __iomem *address = (void __iomem *)file->private_data;
|
|
unsigned char *page;
|
|
int retval;
|
|
int len = 0;
|
|
unsigned int value;
|
|
|
|
if (*offset < 0)
|
|
return -EINVAL;
|
|
if (count == 0 || count > 1024)
|
|
return 0;
|
|
if (*offset != 0)
|
|
return 0;
|
|
|
|
page = (unsigned char *)__get_free_page(GFP_KERNEL);
|
|
if (!page)
|
|
return -ENOMEM;
|
|
|
|
value = readl(address);
|
|
len = sprintf(page, "%d\n", value);
|
|
|
|
if (copy_to_user(buf, page, len)) {
|
|
retval = -EFAULT;
|
|
goto exit;
|
|
}
|
|
*offset += len;
|
|
retval = len;
|
|
|
|
exit:
|
|
free_page((unsigned long)page);
|
|
return retval;
|
|
}
|
|
|
|
static ssize_t remote_settings_file_write(struct file *file, const char __user *ubuff, size_t count, loff_t *offset)
|
|
{
|
|
void __iomem *address = (void __iomem *)file->private_data;
|
|
char *buff;
|
|
unsigned int value;
|
|
|
|
if (*offset < 0)
|
|
return -EINVAL;
|
|
if (count == 0 || count > 1024)
|
|
return 0;
|
|
if (*offset != 0)
|
|
return 0;
|
|
|
|
buff = kzalloc (count + 1, GFP_KERNEL);
|
|
if (!buff)
|
|
return -ENOMEM;
|
|
|
|
|
|
if (copy_from_user(buff, ubuff, count)) {
|
|
kfree(buff);
|
|
return -EFAULT;
|
|
}
|
|
|
|
value = simple_strtoul(buff, NULL, 10);
|
|
writel(value, address);
|
|
kfree(buff);
|
|
|
|
return count;
|
|
}
|
|
|
|
static const struct file_operations command_fops = {
|
|
.open = command_file_open,
|
|
.release = command_file_close,
|
|
.read = command_file_read,
|
|
.write = command_file_write,
|
|
.llseek = generic_file_llseek,
|
|
};
|
|
|
|
static const struct file_operations event_fops = {
|
|
.open = event_file_open,
|
|
.release = event_file_close,
|
|
.read = event_file_read,
|
|
.write = event_file_write,
|
|
.llseek = generic_file_llseek,
|
|
};
|
|
|
|
static const struct file_operations r_heartbeat_fops = {
|
|
.open = r_heartbeat_file_open,
|
|
.release = r_heartbeat_file_close,
|
|
.read = r_heartbeat_file_read,
|
|
.write = r_heartbeat_file_write,
|
|
.llseek = generic_file_llseek,
|
|
};
|
|
|
|
static const struct file_operations remote_settings_fops = {
|
|
.open = simple_open,
|
|
.release = remote_settings_file_close,
|
|
.read = remote_settings_file_read,
|
|
.write = remote_settings_file_write,
|
|
.llseek = generic_file_llseek,
|
|
};
|
|
|
|
|
|
static void ibmasmfs_create_files (struct super_block *sb)
|
|
{
|
|
struct list_head *entry;
|
|
struct service_processor *sp;
|
|
|
|
list_for_each(entry, &service_processors) {
|
|
struct dentry *dir;
|
|
struct dentry *remote_dir;
|
|
sp = list_entry(entry, struct service_processor, node);
|
|
dir = ibmasmfs_create_dir(sb->s_root, sp->dirname);
|
|
if (!dir)
|
|
continue;
|
|
|
|
ibmasmfs_create_file(dir, "command", &command_fops, sp, S_IRUSR|S_IWUSR);
|
|
ibmasmfs_create_file(dir, "event", &event_fops, sp, S_IRUSR|S_IWUSR);
|
|
ibmasmfs_create_file(dir, "reverse_heartbeat", &r_heartbeat_fops, sp, S_IRUSR|S_IWUSR);
|
|
|
|
remote_dir = ibmasmfs_create_dir(dir, "remote_video");
|
|
if (!remote_dir)
|
|
continue;
|
|
|
|
ibmasmfs_create_file(remote_dir, "width", &remote_settings_fops, (void *)display_width(sp), S_IRUSR|S_IWUSR);
|
|
ibmasmfs_create_file(remote_dir, "height", &remote_settings_fops, (void *)display_height(sp), S_IRUSR|S_IWUSR);
|
|
ibmasmfs_create_file(remote_dir, "depth", &remote_settings_fops, (void *)display_depth(sp), S_IRUSR|S_IWUSR);
|
|
}
|
|
}
|