mirror of https://gitee.com/openkylin/linux.git
609 lines
14 KiB
C
609 lines
14 KiB
C
/*
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* IBM ASM Service Processor Device Driver
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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* Copyright (C) IBM Corporation, 2004
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*
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* Author: Max Asböck <amax@us.ibm.com>
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*
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*/
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/*
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* Parts of this code are based on an article by Jonathan Corbet
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* that appeared in Linux Weekly News.
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*/
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/*
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* The IBMASM file virtual filesystem. It creates the following hierarchy
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* dynamically when mounted from user space:
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*
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* /ibmasm
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* |-- 0
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* | |-- command
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* | |-- event
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* | |-- reverse_heartbeat
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* | `-- remote_video
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* | |-- depth
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* | |-- height
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* | `-- width
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* .
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* .
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* .
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* `-- n
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* |-- command
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* |-- event
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* |-- reverse_heartbeat
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* `-- remote_video
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* |-- depth
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* |-- height
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* `-- width
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*
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* For each service processor the following files are created:
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*
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* command: execute dot commands
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* write: execute a dot command on the service processor
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* read: return the result of a previously executed dot command
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*
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* events: listen for service processor events
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* read: sleep (interruptible) until an event occurs
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* write: wakeup sleeping event listener
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*
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* reverse_heartbeat: send a heartbeat to the service processor
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* read: sleep (interruptible) until the reverse heartbeat fails
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* write: wakeup sleeping heartbeat listener
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*
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* remote_video/width
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* remote_video/height
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* remote_video/width: control remote display settings
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* write: set value
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* read: read value
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*/
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#include <linux/fs.h>
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#include <linux/pagemap.h>
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#include <linux/slab.h>
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#include <linux/uaccess.h>
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#include <asm/io.h>
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#include "ibmasm.h"
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#include "remote.h"
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#include "dot_command.h"
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#define IBMASMFS_MAGIC 0x66726f67
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static LIST_HEAD(service_processors);
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static struct inode *ibmasmfs_make_inode(struct super_block *sb, int mode);
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static void ibmasmfs_create_files (struct super_block *sb);
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static int ibmasmfs_fill_super (struct super_block *sb, void *data, int silent);
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static struct dentry *ibmasmfs_mount(struct file_system_type *fst,
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int flags, const char *name, void *data)
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{
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return mount_single(fst, flags, data, ibmasmfs_fill_super);
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}
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static const struct super_operations ibmasmfs_s_ops = {
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.statfs = simple_statfs,
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.drop_inode = generic_delete_inode,
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};
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static const struct file_operations *ibmasmfs_dir_ops = &simple_dir_operations;
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static struct file_system_type ibmasmfs_type = {
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.owner = THIS_MODULE,
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.name = "ibmasmfs",
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.mount = ibmasmfs_mount,
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.kill_sb = kill_litter_super,
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};
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MODULE_ALIAS_FS("ibmasmfs");
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static int ibmasmfs_fill_super (struct super_block *sb, void *data, int silent)
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{
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struct inode *root;
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sb->s_blocksize = PAGE_SIZE;
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sb->s_blocksize_bits = PAGE_SHIFT;
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sb->s_magic = IBMASMFS_MAGIC;
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sb->s_op = &ibmasmfs_s_ops;
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sb->s_time_gran = 1;
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root = ibmasmfs_make_inode (sb, S_IFDIR | 0500);
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if (!root)
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return -ENOMEM;
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root->i_op = &simple_dir_inode_operations;
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root->i_fop = ibmasmfs_dir_ops;
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sb->s_root = d_make_root(root);
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if (!sb->s_root)
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return -ENOMEM;
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ibmasmfs_create_files(sb);
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return 0;
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}
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static struct inode *ibmasmfs_make_inode(struct super_block *sb, int mode)
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{
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struct inode *ret = new_inode(sb);
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if (ret) {
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ret->i_ino = get_next_ino();
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ret->i_mode = mode;
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ret->i_atime = ret->i_mtime = ret->i_ctime = current_time(ret);
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}
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return ret;
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}
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static struct dentry *ibmasmfs_create_file(struct dentry *parent,
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const char *name,
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const struct file_operations *fops,
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void *data,
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int mode)
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{
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struct dentry *dentry;
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struct inode *inode;
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dentry = d_alloc_name(parent, name);
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if (!dentry)
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return NULL;
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inode = ibmasmfs_make_inode(parent->d_sb, S_IFREG | mode);
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if (!inode) {
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dput(dentry);
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return NULL;
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}
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inode->i_fop = fops;
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inode->i_private = data;
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d_add(dentry, inode);
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return dentry;
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}
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static struct dentry *ibmasmfs_create_dir(struct dentry *parent,
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const char *name)
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{
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struct dentry *dentry;
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struct inode *inode;
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dentry = d_alloc_name(parent, name);
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if (!dentry)
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return NULL;
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inode = ibmasmfs_make_inode(parent->d_sb, S_IFDIR | 0500);
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if (!inode) {
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dput(dentry);
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return NULL;
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}
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inode->i_op = &simple_dir_inode_operations;
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inode->i_fop = ibmasmfs_dir_ops;
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d_add(dentry, inode);
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return dentry;
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}
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int ibmasmfs_register(void)
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{
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return register_filesystem(&ibmasmfs_type);
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}
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void ibmasmfs_unregister(void)
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{
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unregister_filesystem(&ibmasmfs_type);
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}
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void ibmasmfs_add_sp(struct service_processor *sp)
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{
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list_add(&sp->node, &service_processors);
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}
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/* struct to save state between command file operations */
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struct ibmasmfs_command_data {
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struct service_processor *sp;
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struct command *command;
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};
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/* struct to save state between event file operations */
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struct ibmasmfs_event_data {
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struct service_processor *sp;
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struct event_reader reader;
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int active;
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};
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/* struct to save state between reverse heartbeat file operations */
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struct ibmasmfs_heartbeat_data {
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struct service_processor *sp;
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struct reverse_heartbeat heartbeat;
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int active;
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};
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static int command_file_open(struct inode *inode, struct file *file)
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{
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struct ibmasmfs_command_data *command_data;
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if (!inode->i_private)
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return -ENODEV;
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command_data = kmalloc(sizeof(struct ibmasmfs_command_data), GFP_KERNEL);
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if (!command_data)
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return -ENOMEM;
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command_data->command = NULL;
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command_data->sp = inode->i_private;
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file->private_data = command_data;
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return 0;
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}
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static int command_file_close(struct inode *inode, struct file *file)
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{
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struct ibmasmfs_command_data *command_data = file->private_data;
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if (command_data->command)
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command_put(command_data->command);
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kfree(command_data);
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return 0;
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}
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static ssize_t command_file_read(struct file *file, char __user *buf, size_t count, loff_t *offset)
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{
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struct ibmasmfs_command_data *command_data = file->private_data;
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struct command *cmd;
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int len;
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unsigned long flags;
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if (*offset < 0)
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return -EINVAL;
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if (count == 0 || count > IBMASM_CMD_MAX_BUFFER_SIZE)
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return 0;
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if (*offset != 0)
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return 0;
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spin_lock_irqsave(&command_data->sp->lock, flags);
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cmd = command_data->command;
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if (cmd == NULL) {
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spin_unlock_irqrestore(&command_data->sp->lock, flags);
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return 0;
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}
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command_data->command = NULL;
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spin_unlock_irqrestore(&command_data->sp->lock, flags);
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if (cmd->status != IBMASM_CMD_COMPLETE) {
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command_put(cmd);
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return -EIO;
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}
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len = min(count, cmd->buffer_size);
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if (copy_to_user(buf, cmd->buffer, len)) {
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command_put(cmd);
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return -EFAULT;
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}
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command_put(cmd);
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return len;
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}
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static ssize_t command_file_write(struct file *file, const char __user *ubuff, size_t count, loff_t *offset)
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{
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struct ibmasmfs_command_data *command_data = file->private_data;
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struct command *cmd;
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unsigned long flags;
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if (*offset < 0)
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return -EINVAL;
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if (count == 0 || count > IBMASM_CMD_MAX_BUFFER_SIZE)
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return 0;
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if (*offset != 0)
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return 0;
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/* commands are executed sequentially, only one command at a time */
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if (command_data->command)
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return -EAGAIN;
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cmd = ibmasm_new_command(command_data->sp, count);
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if (!cmd)
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return -ENOMEM;
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if (copy_from_user(cmd->buffer, ubuff, count)) {
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command_put(cmd);
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return -EFAULT;
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}
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spin_lock_irqsave(&command_data->sp->lock, flags);
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if (command_data->command) {
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spin_unlock_irqrestore(&command_data->sp->lock, flags);
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command_put(cmd);
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return -EAGAIN;
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}
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command_data->command = cmd;
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spin_unlock_irqrestore(&command_data->sp->lock, flags);
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ibmasm_exec_command(command_data->sp, cmd);
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ibmasm_wait_for_response(cmd, get_dot_command_timeout(cmd->buffer));
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return count;
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}
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static int event_file_open(struct inode *inode, struct file *file)
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{
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struct ibmasmfs_event_data *event_data;
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struct service_processor *sp;
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if (!inode->i_private)
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return -ENODEV;
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sp = inode->i_private;
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event_data = kmalloc(sizeof(struct ibmasmfs_event_data), GFP_KERNEL);
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if (!event_data)
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return -ENOMEM;
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ibmasm_event_reader_register(sp, &event_data->reader);
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event_data->sp = sp;
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event_data->active = 0;
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file->private_data = event_data;
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return 0;
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}
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static int event_file_close(struct inode *inode, struct file *file)
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{
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struct ibmasmfs_event_data *event_data = file->private_data;
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ibmasm_event_reader_unregister(event_data->sp, &event_data->reader);
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kfree(event_data);
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return 0;
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}
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static ssize_t event_file_read(struct file *file, char __user *buf, size_t count, loff_t *offset)
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{
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struct ibmasmfs_event_data *event_data = file->private_data;
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struct event_reader *reader = &event_data->reader;
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struct service_processor *sp = event_data->sp;
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int ret;
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unsigned long flags;
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if (*offset < 0)
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return -EINVAL;
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if (count == 0 || count > IBMASM_EVENT_MAX_SIZE)
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return 0;
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if (*offset != 0)
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return 0;
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spin_lock_irqsave(&sp->lock, flags);
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if (event_data->active) {
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spin_unlock_irqrestore(&sp->lock, flags);
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return -EBUSY;
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}
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event_data->active = 1;
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spin_unlock_irqrestore(&sp->lock, flags);
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ret = ibmasm_get_next_event(sp, reader);
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if (ret <= 0)
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goto out;
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if (count < reader->data_size) {
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ret = -EINVAL;
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goto out;
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}
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if (copy_to_user(buf, reader->data, reader->data_size)) {
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ret = -EFAULT;
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goto out;
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}
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ret = reader->data_size;
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out:
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event_data->active = 0;
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return ret;
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}
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static ssize_t event_file_write(struct file *file, const char __user *buf, size_t count, loff_t *offset)
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{
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struct ibmasmfs_event_data *event_data = file->private_data;
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if (*offset < 0)
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return -EINVAL;
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if (count != 1)
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return 0;
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if (*offset != 0)
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return 0;
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ibmasm_cancel_next_event(&event_data->reader);
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return 0;
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}
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static int r_heartbeat_file_open(struct inode *inode, struct file *file)
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{
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struct ibmasmfs_heartbeat_data *rhbeat;
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if (!inode->i_private)
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return -ENODEV;
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rhbeat = kmalloc(sizeof(struct ibmasmfs_heartbeat_data), GFP_KERNEL);
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if (!rhbeat)
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return -ENOMEM;
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rhbeat->sp = inode->i_private;
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rhbeat->active = 0;
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ibmasm_init_reverse_heartbeat(rhbeat->sp, &rhbeat->heartbeat);
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file->private_data = rhbeat;
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return 0;
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}
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static int r_heartbeat_file_close(struct inode *inode, struct file *file)
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{
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struct ibmasmfs_heartbeat_data *rhbeat = file->private_data;
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kfree(rhbeat);
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return 0;
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}
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static ssize_t r_heartbeat_file_read(struct file *file, char __user *buf, size_t count, loff_t *offset)
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{
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struct ibmasmfs_heartbeat_data *rhbeat = file->private_data;
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unsigned long flags;
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int result;
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if (*offset < 0)
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return -EINVAL;
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if (count == 0 || count > 1024)
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return 0;
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if (*offset != 0)
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return 0;
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/* allow only one reverse heartbeat per process */
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spin_lock_irqsave(&rhbeat->sp->lock, flags);
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if (rhbeat->active) {
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spin_unlock_irqrestore(&rhbeat->sp->lock, flags);
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return -EBUSY;
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}
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rhbeat->active = 1;
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spin_unlock_irqrestore(&rhbeat->sp->lock, flags);
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result = ibmasm_start_reverse_heartbeat(rhbeat->sp, &rhbeat->heartbeat);
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rhbeat->active = 0;
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return result;
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}
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static ssize_t r_heartbeat_file_write(struct file *file, const char __user *buf, size_t count, loff_t *offset)
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{
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struct ibmasmfs_heartbeat_data *rhbeat = file->private_data;
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if (*offset < 0)
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return -EINVAL;
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if (count != 1)
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return 0;
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if (*offset != 0)
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return 0;
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if (rhbeat->active)
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ibmasm_stop_reverse_heartbeat(&rhbeat->heartbeat);
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return 1;
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}
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static int remote_settings_file_close(struct inode *inode, struct file *file)
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{
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return 0;
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}
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static ssize_t remote_settings_file_read(struct file *file, char __user *buf, size_t count, loff_t *offset)
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{
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void __iomem *address = (void __iomem *)file->private_data;
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int len = 0;
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unsigned int value;
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char lbuf[20];
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value = readl(address);
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len = snprintf(lbuf, sizeof(lbuf), "%d\n", value);
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return simple_read_from_buffer(buf, count, offset, lbuf, len);
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}
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static ssize_t remote_settings_file_write(struct file *file, const char __user *ubuff, size_t count, loff_t *offset)
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{
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void __iomem *address = (void __iomem *)file->private_data;
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char *buff;
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unsigned int value;
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if (*offset < 0)
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return -EINVAL;
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if (count == 0 || count > 1024)
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return 0;
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if (*offset != 0)
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return 0;
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buff = kzalloc (count + 1, GFP_KERNEL);
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if (!buff)
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return -ENOMEM;
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if (copy_from_user(buff, ubuff, count)) {
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kfree(buff);
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return -EFAULT;
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}
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value = simple_strtoul(buff, NULL, 10);
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writel(value, address);
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kfree(buff);
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return count;
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}
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static const struct file_operations command_fops = {
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.open = command_file_open,
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.release = command_file_close,
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.read = command_file_read,
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.write = command_file_write,
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.llseek = generic_file_llseek,
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};
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static const struct file_operations event_fops = {
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.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);
|
|
}
|
|
}
|