diff options
Diffstat (limited to 'drivers/infiniband/hw/ipath/ipath_fs.c')
| -rw-r--r-- | drivers/infiniband/hw/ipath/ipath_fs.c | 426 |
1 files changed, 426 insertions, 0 deletions
diff --git a/drivers/infiniband/hw/ipath/ipath_fs.c b/drivers/infiniband/hw/ipath/ipath_fs.c new file mode 100644 index 0000000..8bb5170 --- /dev/null +++ b/drivers/infiniband/hw/ipath/ipath_fs.c @@ -0,0 +1,426 @@ +/* + * Copyright (c) 2006, 2007 QLogic Corporation. All rights reserved. + * Copyright (c) 2006 PathScale, Inc. All rights reserved. + * + * This software is available to you under a choice of one of two + * licenses. You may choose to be licensed under the terms of the GNU + * General Public License (GPL) Version 2, available from the file + * COPYING in the main directory of this source tree, or the + * OpenIB.org BSD license below: + * + * Redistribution and use in source and binary forms, with or + * without modification, are permitted provided that the following + * conditions are met: + * + * - Redistributions of source code must retain the above + * copyright notice, this list of conditions and the following + * disclaimer. + * + * - Redistributions in binary form must reproduce the above + * copyright notice, this list of conditions and the following + * disclaimer in the documentation and/or other materials + * provided with the distribution. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, + * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND + * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS + * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN + * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN + * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE + * SOFTWARE. + */ + +#include <linux/module.h> +#include <linux/fs.h> +#include <linux/mount.h> +#include <linux/pagemap.h> +#include <linux/init.h> +#include <linux/namei.h> + +#include "ipath_kernel.h" + +#define IPATHFS_MAGIC 0x726a77 + +static struct super_block *ipath_super; + +static int ipathfs_mknod(struct inode *dir, struct dentry *dentry, + int mode, const struct file_operations *fops, + void *data) +{ + int error; + struct inode *inode = new_inode(dir->i_sb); + + if (!inode) { + error = -EPERM; + goto bail; + } + + inode->i_mode = mode; + inode->i_uid = 0; + inode->i_gid = 0; + inode->i_blocks = 0; + inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; + inode->i_private = data; + if ((mode & S_IFMT) == S_IFDIR) { + inode->i_op = &simple_dir_inode_operations; + inc_nlink(inode); + inc_nlink(dir); + } + + inode->i_fop = fops; + + d_instantiate(dentry, inode); + error = 0; + +bail: + return error; +} + +static int create_file(const char *name, mode_t mode, + struct dentry *parent, struct dentry **dentry, + const struct file_operations *fops, void *data) +{ + int error; + + *dentry = NULL; + mutex_lock(&parent->d_inode->i_mutex); + *dentry = lookup_one_len(name, parent, strlen(name)); + if (!IS_ERR(dentry)) + error = ipathfs_mknod(parent->d_inode, *dentry, + mode, fops, data); + else + error = PTR_ERR(dentry); + mutex_unlock(&parent->d_inode->i_mutex); + + return error; +} + +static ssize_t atomic_stats_read(struct file *file, char __user *buf, + size_t count, loff_t *ppos) +{ + return simple_read_from_buffer(buf, count, ppos, &ipath_stats, + sizeof ipath_stats); +} + +static const struct file_operations atomic_stats_ops = { + .read = atomic_stats_read, +}; + +static ssize_t atomic_counters_read(struct file *file, char __user *buf, + size_t count, loff_t *ppos) +{ + struct infinipath_counters counters; + struct ipath_devdata *dd; + + dd = file->f_path.dentry->d_inode->i_private; + dd->ipath_f_read_counters(dd, &counters); + + return simple_read_from_buffer(buf, count, ppos, &counters, + sizeof counters); +} + +static const struct file_operations atomic_counters_ops = { + .read = atomic_counters_read, +}; + +static ssize_t flash_read(struct file *file, char __user *buf, + size_t count, loff_t *ppos) +{ + struct ipath_devdata *dd; + ssize_t ret; + loff_t pos; + char *tmp; + + pos = *ppos; + + if ( pos < 0) { + ret = -EINVAL; + goto bail; + } + + if (pos >= sizeof(struct ipath_flash)) { + ret = 0; + goto bail; + } + + if (count > sizeof(struct ipath_flash) - pos) + count = sizeof(struct ipath_flash) - pos; + + tmp = kmalloc(count, GFP_KERNEL); + if (!tmp) { + ret = -ENOMEM; + goto bail; + } + + dd = file->f_path.dentry->d_inode->i_private; + if (ipath_eeprom_read(dd, pos, tmp, count)) { + ipath_dev_err(dd, "failed to read from flash\n"); + ret = -ENXIO; + goto bail_tmp; + } + + if (copy_to_user(buf, tmp, count)) { + ret = -EFAULT; + goto bail_tmp; + } + + *ppos = pos + count; + ret = count; + +bail_tmp: + kfree(tmp); + +bail: + return ret; +} + +static ssize_t flash_write(struct file *file, const char __user *buf, + size_t count, loff_t *ppos) +{ + struct ipath_devdata *dd; + ssize_t ret; + loff_t pos; + char *tmp; + + pos = *ppos; + + if (pos != 0) { + ret = -EINVAL; + goto bail; + } + + if (count != sizeof(struct ipath_flash)) { + ret = -EINVAL; + goto bail; + } + + tmp = kmalloc(count, GFP_KERNEL); + if (!tmp) { + ret = -ENOMEM; + goto bail; + } + + if (copy_from_user(tmp, buf, count)) { + ret = -EFAULT; + goto bail_tmp; + } + + dd = file->f_path.dentry->d_inode->i_private; + if (ipath_eeprom_write(dd, pos, tmp, count)) { + ret = -ENXIO; + ipath_dev_err(dd, "failed to write to flash\n"); + goto bail_tmp; + } + + *ppos = pos + count; + ret = count; + +bail_tmp: + kfree(tmp); + +bail: + return ret; +} + +static const struct file_operations flash_ops = { + .read = flash_read, + .write = flash_write, +}; + +static int create_device_files(struct super_block *sb, + struct ipath_devdata *dd) +{ + struct dentry *dir, *tmp; + char unit[10]; + int ret; + + snprintf(unit, sizeof unit, "%02d", dd->ipath_unit); + ret = create_file(unit, S_IFDIR|S_IRUGO|S_IXUGO, sb->s_root, &dir, + &simple_dir_operations, dd); + if (ret) { + printk(KERN_ERR "create_file(%s) failed: %d\n", unit, ret); + goto bail; + } + + ret = create_file("atomic_counters", S_IFREG|S_IRUGO, dir, &tmp, + &atomic_counters_ops, dd); + if (ret) { + printk(KERN_ERR "create_file(%s/atomic_counters) " + "failed: %d\n", unit, ret); + goto bail; + } + + ret = create_file("flash", S_IFREG|S_IWUSR|S_IRUGO, dir, &tmp, + &flash_ops, dd); + if (ret) { + printk(KERN_ERR "create_file(%s/flash) " + "failed: %d\n", unit, ret); + goto bail; + } + +bail: + return ret; +} + +static int remove_file(struct dentry *parent, char *name) +{ + struct dentry *tmp; + int ret; + + tmp = lookup_one_len(name, parent, strlen(name)); + + if (IS_ERR(tmp)) { + ret = PTR_ERR(tmp); + goto bail; + } + + spin_lock(&dcache_lock); + spin_lock(&tmp->d_lock); + if (!(d_unhashed(tmp) && tmp->d_inode)) { + dget_locked(tmp); + __d_drop(tmp); + spin_unlock(&tmp->d_lock); + spin_unlock(&dcache_lock); + simple_unlink(parent->d_inode, tmp); + } else { + spin_unlock(&tmp->d_lock); + spin_unlock(&dcache_lock); + } + + ret = 0; +bail: + /* + * We don't expect clients to care about the return value, but + * it's there if they need it. + */ + return ret; +} + +static int remove_device_files(struct super_block *sb, + struct ipath_devdata *dd) +{ + struct dentry *dir, *root; + char unit[10]; + int ret; + + root = dget(sb->s_root); + mutex_lock(&root->d_inode->i_mutex); + snprintf(unit, sizeof unit, "%02d", dd->ipath_unit); + dir = lookup_one_len(unit, root, strlen(unit)); + + if (IS_ERR(dir)) { + ret = PTR_ERR(dir); + printk(KERN_ERR "Lookup of %s failed\n", unit); + goto bail; + } + + remove_file(dir, "flash"); + remove_file(dir, "atomic_counters"); + d_delete(dir); + ret = simple_rmdir(root->d_inode, dir); + +bail: + mutex_unlock(&root->d_inode->i_mutex); + dput(root); + return ret; +} + +static int ipathfs_fill_super(struct super_block *sb, void *data, + int silent) +{ + struct ipath_devdata *dd, *tmp; + unsigned long flags; + int ret; + + static struct tree_descr files[] = { + [2] = {"atomic_stats", &atomic_stats_ops, S_IRUGO}, + {""}, + }; + + ret = simple_fill_super(sb, IPATHFS_MAGIC, files); + if (ret) { + printk(KERN_ERR "simple_fill_super failed: %d\n", ret); + goto bail; + } + + spin_lock_irqsave(&ipath_devs_lock, flags); + + list_for_each_entry_safe(dd, tmp, &ipath_dev_list, ipath_list) { + spin_unlock_irqrestore(&ipath_devs_lock, flags); + ret = create_device_files(sb, dd); + if (ret) { + deactivate_super(sb); + goto bail; + } + spin_lock_irqsave(&ipath_devs_lock, flags); + } + + spin_unlock_irqrestore(&ipath_devs_lock, flags); + +bail: + return ret; +} + +static int ipathfs_get_sb(struct file_system_type *fs_type, int flags, + const char *dev_name, void *data, struct vfsmount *mnt) +{ + int ret = get_sb_single(fs_type, flags, data, + ipathfs_fill_super, mnt); + if (ret >= 0) + ipath_super = mnt->mnt_sb; + return ret; +} + +static void ipathfs_kill_super(struct super_block *s) +{ + kill_litter_super(s); + ipath_super = NULL; +} + +int ipathfs_add_device(struct ipath_devdata *dd) +{ + int ret; + + if (ipath_super == NULL) { + ret = 0; + goto bail; + } + + ret = create_device_files(ipath_super, dd); + +bail: + return ret; +} + +int ipathfs_remove_device(struct ipath_devdata *dd) +{ + int ret; + + if (ipath_super == NULL) { + ret = 0; + goto bail; + } + + ret = remove_device_files(ipath_super, dd); + +bail: + return ret; +} + +static struct file_system_type ipathfs_fs_type = { + .owner = THIS_MODULE, + .name = "ipathfs", + .get_sb = ipathfs_get_sb, + .kill_sb = ipathfs_kill_super, +}; + +int __init ipath_init_ipathfs(void) +{ + return register_filesystem(&ipathfs_fs_type); +} + +void __exit ipath_exit_ipathfs(void) +{ + unregister_filesystem(&ipathfs_fs_type); +} |
