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607 lines
14 KiB
607 lines
14 KiB
/* |
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* Copyright (c) 2012 Intel Corporation. All rights reserved. |
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* Copyright (c) 2006 - 2012 QLogic Corporation. All rights reserved. |
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* Copyright (c) 2006 PathScale, Inc. All rights reserved. |
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* |
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* This software is available to you under a choice of one of two |
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* licenses. You may choose to be licensed under the terms of the GNU |
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* General Public License (GPL) Version 2, available from the file |
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* COPYING in the main directory of this source tree, or the |
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* OpenIB.org BSD license below: |
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* |
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* Redistribution and use in source and binary forms, with or |
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* without modification, are permitted provided that the following |
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* conditions are met: |
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* |
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* - Redistributions of source code must retain the above |
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* copyright notice, this list of conditions and the following |
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* disclaimer. |
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* |
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* - Redistributions in binary form must reproduce the above |
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* copyright notice, this list of conditions and the following |
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* disclaimer in the documentation and/or other materials |
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* provided with the distribution. |
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* |
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, |
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND |
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS |
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN |
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN |
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
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* SOFTWARE. |
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*/ |
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|
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#include <linux/module.h> |
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#include <linux/fs.h> |
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#include <linux/fs_context.h> |
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#include <linux/mount.h> |
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#include <linux/pagemap.h> |
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#include <linux/init.h> |
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#include <linux/namei.h> |
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|
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#include "qib.h" |
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|
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#define QIBFS_MAGIC 0x726a77 |
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|
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static struct super_block *qib_super; |
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|
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#define private2dd(file) (file_inode(file)->i_private) |
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|
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static int qibfs_mknod(struct inode *dir, struct dentry *dentry, |
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umode_t mode, const struct file_operations *fops, |
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void *data) |
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{ |
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int error; |
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struct inode *inode = new_inode(dir->i_sb); |
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|
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if (!inode) { |
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error = -EPERM; |
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goto bail; |
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} |
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|
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inode->i_ino = get_next_ino(); |
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inode->i_mode = mode; |
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inode->i_uid = GLOBAL_ROOT_UID; |
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inode->i_gid = GLOBAL_ROOT_GID; |
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inode->i_blocks = 0; |
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inode->i_atime = current_time(inode); |
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inode->i_mtime = inode->i_atime; |
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inode->i_ctime = inode->i_atime; |
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inode->i_private = data; |
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if (S_ISDIR(mode)) { |
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inode->i_op = &simple_dir_inode_operations; |
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inc_nlink(inode); |
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inc_nlink(dir); |
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} |
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|
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inode->i_fop = fops; |
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|
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d_instantiate(dentry, inode); |
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error = 0; |
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|
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bail: |
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return error; |
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} |
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|
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static int create_file(const char *name, umode_t mode, |
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struct dentry *parent, struct dentry **dentry, |
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const struct file_operations *fops, void *data) |
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{ |
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int error; |
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|
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inode_lock(d_inode(parent)); |
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*dentry = lookup_one_len(name, parent, strlen(name)); |
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if (!IS_ERR(*dentry)) |
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error = qibfs_mknod(d_inode(parent), *dentry, |
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mode, fops, data); |
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else |
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error = PTR_ERR(*dentry); |
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inode_unlock(d_inode(parent)); |
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|
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return error; |
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} |
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static ssize_t driver_stats_read(struct file *file, char __user *buf, |
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size_t count, loff_t *ppos) |
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{ |
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qib_stats.sps_ints = qib_sps_ints(); |
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return simple_read_from_buffer(buf, count, ppos, &qib_stats, |
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sizeof(qib_stats)); |
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} |
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|
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/* |
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* driver stats field names, one line per stat, single string. Used by |
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* programs like ipathstats to print the stats in a way which works for |
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* different versions of drivers, without changing program source. |
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* if qlogic_ib_stats changes, this needs to change. Names need to be |
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* 12 chars or less (w/o newline), for proper display by ipathstats utility. |
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*/ |
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static const char qib_statnames[] = |
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"KernIntr\n" |
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"ErrorIntr\n" |
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"Tx_Errs\n" |
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"Rcv_Errs\n" |
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"H/W_Errs\n" |
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"NoPIOBufs\n" |
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"CtxtsOpen\n" |
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"RcvLen_Errs\n" |
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"EgrBufFull\n" |
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"EgrHdrFull\n" |
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; |
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|
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static ssize_t driver_names_read(struct file *file, char __user *buf, |
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size_t count, loff_t *ppos) |
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{ |
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return simple_read_from_buffer(buf, count, ppos, qib_statnames, |
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sizeof(qib_statnames) - 1); /* no null */ |
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} |
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|
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static const struct file_operations driver_ops[] = { |
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{ .read = driver_stats_read, .llseek = generic_file_llseek, }, |
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{ .read = driver_names_read, .llseek = generic_file_llseek, }, |
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}; |
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|
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/* read the per-device counters */ |
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static ssize_t dev_counters_read(struct file *file, char __user *buf, |
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size_t count, loff_t *ppos) |
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{ |
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u64 *counters; |
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size_t avail; |
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struct qib_devdata *dd = private2dd(file); |
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|
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avail = dd->f_read_cntrs(dd, *ppos, NULL, &counters); |
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return simple_read_from_buffer(buf, count, ppos, counters, avail); |
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} |
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|
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/* read the per-device counters */ |
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static ssize_t dev_names_read(struct file *file, char __user *buf, |
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size_t count, loff_t *ppos) |
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{ |
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char *names; |
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size_t avail; |
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struct qib_devdata *dd = private2dd(file); |
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|
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avail = dd->f_read_cntrs(dd, *ppos, &names, NULL); |
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return simple_read_from_buffer(buf, count, ppos, names, avail); |
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} |
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|
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static const struct file_operations cntr_ops[] = { |
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{ .read = dev_counters_read, .llseek = generic_file_llseek, }, |
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{ .read = dev_names_read, .llseek = generic_file_llseek, }, |
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}; |
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|
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/* |
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* Could use file_inode(file)->i_ino to figure out which file, |
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* instead of separate routine for each, but for now, this works... |
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*/ |
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|
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/* read the per-port names (same for each port) */ |
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static ssize_t portnames_read(struct file *file, char __user *buf, |
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size_t count, loff_t *ppos) |
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{ |
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char *names; |
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size_t avail; |
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struct qib_devdata *dd = private2dd(file); |
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|
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avail = dd->f_read_portcntrs(dd, *ppos, 0, &names, NULL); |
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return simple_read_from_buffer(buf, count, ppos, names, avail); |
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} |
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|
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/* read the per-port counters for port 1 (pidx 0) */ |
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static ssize_t portcntrs_1_read(struct file *file, char __user *buf, |
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size_t count, loff_t *ppos) |
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{ |
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u64 *counters; |
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size_t avail; |
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struct qib_devdata *dd = private2dd(file); |
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|
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avail = dd->f_read_portcntrs(dd, *ppos, 0, NULL, &counters); |
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return simple_read_from_buffer(buf, count, ppos, counters, avail); |
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} |
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|
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/* read the per-port counters for port 2 (pidx 1) */ |
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static ssize_t portcntrs_2_read(struct file *file, char __user *buf, |
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size_t count, loff_t *ppos) |
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{ |
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u64 *counters; |
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size_t avail; |
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struct qib_devdata *dd = private2dd(file); |
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|
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avail = dd->f_read_portcntrs(dd, *ppos, 1, NULL, &counters); |
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return simple_read_from_buffer(buf, count, ppos, counters, avail); |
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} |
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static const struct file_operations portcntr_ops[] = { |
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{ .read = portnames_read, .llseek = generic_file_llseek, }, |
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{ .read = portcntrs_1_read, .llseek = generic_file_llseek, }, |
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{ .read = portcntrs_2_read, .llseek = generic_file_llseek, }, |
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}; |
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/* |
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* read the per-port QSFP data for port 1 (pidx 0) |
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*/ |
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static ssize_t qsfp_1_read(struct file *file, char __user *buf, |
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size_t count, loff_t *ppos) |
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{ |
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struct qib_devdata *dd = private2dd(file); |
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char *tmp; |
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int ret; |
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tmp = kmalloc(PAGE_SIZE, GFP_KERNEL); |
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if (!tmp) |
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return -ENOMEM; |
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ret = qib_qsfp_dump(dd->pport, tmp, PAGE_SIZE); |
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if (ret > 0) |
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ret = simple_read_from_buffer(buf, count, ppos, tmp, ret); |
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kfree(tmp); |
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return ret; |
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} |
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/* |
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* read the per-port QSFP data for port 2 (pidx 1) |
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*/ |
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static ssize_t qsfp_2_read(struct file *file, char __user *buf, |
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size_t count, loff_t *ppos) |
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{ |
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struct qib_devdata *dd = private2dd(file); |
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char *tmp; |
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int ret; |
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|
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if (dd->num_pports < 2) |
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return -ENODEV; |
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tmp = kmalloc(PAGE_SIZE, GFP_KERNEL); |
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if (!tmp) |
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return -ENOMEM; |
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ret = qib_qsfp_dump(dd->pport + 1, tmp, PAGE_SIZE); |
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if (ret > 0) |
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ret = simple_read_from_buffer(buf, count, ppos, tmp, ret); |
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kfree(tmp); |
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return ret; |
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} |
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static const struct file_operations qsfp_ops[] = { |
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{ .read = qsfp_1_read, .llseek = generic_file_llseek, }, |
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{ .read = qsfp_2_read, .llseek = generic_file_llseek, }, |
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}; |
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static ssize_t flash_read(struct file *file, char __user *buf, |
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size_t count, loff_t *ppos) |
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{ |
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struct qib_devdata *dd; |
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ssize_t ret; |
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loff_t pos; |
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char *tmp; |
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pos = *ppos; |
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if (pos < 0) { |
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ret = -EINVAL; |
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goto bail; |
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} |
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if (pos >= sizeof(struct qib_flash)) { |
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ret = 0; |
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goto bail; |
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} |
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if (count > sizeof(struct qib_flash) - pos) |
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count = sizeof(struct qib_flash) - pos; |
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|
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tmp = kmalloc(count, GFP_KERNEL); |
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if (!tmp) { |
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ret = -ENOMEM; |
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goto bail; |
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} |
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dd = private2dd(file); |
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if (qib_eeprom_read(dd, pos, tmp, count)) { |
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qib_dev_err(dd, "failed to read from flash\n"); |
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ret = -ENXIO; |
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goto bail_tmp; |
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} |
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|
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if (copy_to_user(buf, tmp, count)) { |
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ret = -EFAULT; |
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goto bail_tmp; |
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} |
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*ppos = pos + count; |
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ret = count; |
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bail_tmp: |
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kfree(tmp); |
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|
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bail: |
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return ret; |
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} |
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static ssize_t flash_write(struct file *file, const char __user *buf, |
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size_t count, loff_t *ppos) |
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{ |
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struct qib_devdata *dd; |
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ssize_t ret; |
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loff_t pos; |
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char *tmp; |
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pos = *ppos; |
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if (pos != 0 || count != sizeof(struct qib_flash)) |
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return -EINVAL; |
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tmp = memdup_user(buf, count); |
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if (IS_ERR(tmp)) |
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return PTR_ERR(tmp); |
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dd = private2dd(file); |
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if (qib_eeprom_write(dd, pos, tmp, count)) { |
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ret = -ENXIO; |
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qib_dev_err(dd, "failed to write to flash\n"); |
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goto bail_tmp; |
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} |
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*ppos = pos + count; |
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ret = count; |
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bail_tmp: |
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kfree(tmp); |
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return ret; |
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} |
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|
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static const struct file_operations flash_ops = { |
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.read = flash_read, |
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.write = flash_write, |
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.llseek = default_llseek, |
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}; |
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|
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static int add_cntr_files(struct super_block *sb, struct qib_devdata *dd) |
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{ |
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struct dentry *dir, *tmp; |
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char unit[10]; |
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int ret, i; |
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|
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/* create the per-unit directory */ |
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snprintf(unit, sizeof(unit), "%u", dd->unit); |
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ret = create_file(unit, S_IFDIR|S_IRUGO|S_IXUGO, sb->s_root, &dir, |
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&simple_dir_operations, dd); |
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if (ret) { |
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pr_err("create_file(%s) failed: %d\n", unit, ret); |
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goto bail; |
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} |
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|
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/* create the files in the new directory */ |
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ret = create_file("counters", S_IFREG|S_IRUGO, dir, &tmp, |
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&cntr_ops[0], dd); |
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if (ret) { |
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pr_err("create_file(%s/counters) failed: %d\n", |
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unit, ret); |
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goto bail; |
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} |
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ret = create_file("counter_names", S_IFREG|S_IRUGO, dir, &tmp, |
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&cntr_ops[1], dd); |
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if (ret) { |
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pr_err("create_file(%s/counter_names) failed: %d\n", |
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unit, ret); |
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goto bail; |
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} |
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ret = create_file("portcounter_names", S_IFREG|S_IRUGO, dir, &tmp, |
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&portcntr_ops[0], dd); |
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if (ret) { |
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pr_err("create_file(%s/%s) failed: %d\n", |
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unit, "portcounter_names", ret); |
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goto bail; |
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} |
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for (i = 1; i <= dd->num_pports; i++) { |
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char fname[24]; |
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|
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sprintf(fname, "port%dcounters", i); |
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/* create the files in the new directory */ |
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ret = create_file(fname, S_IFREG|S_IRUGO, dir, &tmp, |
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&portcntr_ops[i], dd); |
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if (ret) { |
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pr_err("create_file(%s/%s) failed: %d\n", |
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unit, fname, ret); |
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goto bail; |
|
} |
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if (!(dd->flags & QIB_HAS_QSFP)) |
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continue; |
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sprintf(fname, "qsfp%d", i); |
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ret = create_file(fname, S_IFREG|S_IRUGO, dir, &tmp, |
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&qsfp_ops[i - 1], dd); |
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if (ret) { |
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pr_err("create_file(%s/%s) failed: %d\n", |
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unit, fname, ret); |
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goto bail; |
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} |
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} |
|
|
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ret = create_file("flash", S_IFREG|S_IWUSR|S_IRUGO, dir, &tmp, |
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&flash_ops, dd); |
|
if (ret) |
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pr_err("create_file(%s/flash) failed: %d\n", |
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unit, ret); |
|
bail: |
|
return ret; |
|
} |
|
|
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static int remove_file(struct dentry *parent, char *name) |
|
{ |
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struct dentry *tmp; |
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int ret; |
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|
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tmp = lookup_one_len(name, parent, strlen(name)); |
|
|
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if (IS_ERR(tmp)) { |
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ret = PTR_ERR(tmp); |
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goto bail; |
|
} |
|
|
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spin_lock(&tmp->d_lock); |
|
if (simple_positive(tmp)) { |
|
__d_drop(tmp); |
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spin_unlock(&tmp->d_lock); |
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simple_unlink(d_inode(parent), tmp); |
|
} else { |
|
spin_unlock(&tmp->d_lock); |
|
} |
|
dput(tmp); |
|
|
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ret = 0; |
|
bail: |
|
/* |
|
* We don't expect clients to care about the return value, but |
|
* it's there if they need it. |
|
*/ |
|
return ret; |
|
} |
|
|
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static int remove_device_files(struct super_block *sb, |
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struct qib_devdata *dd) |
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{ |
|
struct dentry *dir, *root; |
|
char unit[10]; |
|
int ret, i; |
|
|
|
root = dget(sb->s_root); |
|
inode_lock(d_inode(root)); |
|
snprintf(unit, sizeof(unit), "%u", dd->unit); |
|
dir = lookup_one_len(unit, root, strlen(unit)); |
|
|
|
if (IS_ERR(dir)) { |
|
ret = PTR_ERR(dir); |
|
pr_err("Lookup of %s failed\n", unit); |
|
goto bail; |
|
} |
|
|
|
inode_lock(d_inode(dir)); |
|
remove_file(dir, "counters"); |
|
remove_file(dir, "counter_names"); |
|
remove_file(dir, "portcounter_names"); |
|
for (i = 0; i < dd->num_pports; i++) { |
|
char fname[24]; |
|
|
|
sprintf(fname, "port%dcounters", i + 1); |
|
remove_file(dir, fname); |
|
if (dd->flags & QIB_HAS_QSFP) { |
|
sprintf(fname, "qsfp%d", i + 1); |
|
remove_file(dir, fname); |
|
} |
|
} |
|
remove_file(dir, "flash"); |
|
inode_unlock(d_inode(dir)); |
|
ret = simple_rmdir(d_inode(root), dir); |
|
d_drop(dir); |
|
dput(dir); |
|
|
|
bail: |
|
inode_unlock(d_inode(root)); |
|
dput(root); |
|
return ret; |
|
} |
|
|
|
/* |
|
* This fills everything in when the fs is mounted, to handle umount/mount |
|
* after device init. The direct add_cntr_files() call handles adding |
|
* them from the init code, when the fs is already mounted. |
|
*/ |
|
static int qibfs_fill_super(struct super_block *sb, struct fs_context *fc) |
|
{ |
|
struct qib_devdata *dd; |
|
unsigned long index; |
|
int ret; |
|
|
|
static const struct tree_descr files[] = { |
|
[2] = {"driver_stats", &driver_ops[0], S_IRUGO}, |
|
[3] = {"driver_stats_names", &driver_ops[1], S_IRUGO}, |
|
{""}, |
|
}; |
|
|
|
ret = simple_fill_super(sb, QIBFS_MAGIC, files); |
|
if (ret) { |
|
pr_err("simple_fill_super failed: %d\n", ret); |
|
goto bail; |
|
} |
|
|
|
xa_for_each(&qib_dev_table, index, dd) { |
|
ret = add_cntr_files(sb, dd); |
|
if (ret) |
|
goto bail; |
|
} |
|
|
|
bail: |
|
return ret; |
|
} |
|
|
|
static int qibfs_get_tree(struct fs_context *fc) |
|
{ |
|
int ret = get_tree_single(fc, qibfs_fill_super); |
|
if (ret == 0) |
|
qib_super = fc->root->d_sb; |
|
return ret; |
|
} |
|
|
|
static const struct fs_context_operations qibfs_context_ops = { |
|
.get_tree = qibfs_get_tree, |
|
}; |
|
|
|
static int qibfs_init_fs_context(struct fs_context *fc) |
|
{ |
|
fc->ops = &qibfs_context_ops; |
|
return 0; |
|
} |
|
|
|
static void qibfs_kill_super(struct super_block *s) |
|
{ |
|
kill_litter_super(s); |
|
qib_super = NULL; |
|
} |
|
|
|
int qibfs_add(struct qib_devdata *dd) |
|
{ |
|
int ret; |
|
|
|
/* |
|
* On first unit initialized, qib_super will not yet exist |
|
* because nobody has yet tried to mount the filesystem, so |
|
* we can't consider that to be an error; if an error occurs |
|
* during the mount, that will get a complaint, so this is OK. |
|
* add_cntr_files() for all units is done at mount from |
|
* qibfs_fill_super(), so one way or another, everything works. |
|
*/ |
|
if (qib_super == NULL) |
|
ret = 0; |
|
else |
|
ret = add_cntr_files(qib_super, dd); |
|
return ret; |
|
} |
|
|
|
int qibfs_remove(struct qib_devdata *dd) |
|
{ |
|
int ret = 0; |
|
|
|
if (qib_super) |
|
ret = remove_device_files(qib_super, dd); |
|
|
|
return ret; |
|
} |
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|
|
static struct file_system_type qibfs_fs_type = { |
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.owner = THIS_MODULE, |
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.name = "ipathfs", |
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.init_fs_context = qibfs_init_fs_context, |
|
.kill_sb = qibfs_kill_super, |
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}; |
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MODULE_ALIAS_FS("ipathfs"); |
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|
|
int __init qib_init_qibfs(void) |
|
{ |
|
return register_filesystem(&qibfs_fs_type); |
|
} |
|
|
|
int __exit qib_exit_qibfs(void) |
|
{ |
|
return unregister_filesystem(&qibfs_fs_type); |
|
}
|
|
|