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![Leon Romanovsky](/assets/img/avatar_default.png)
There is no need in include of module.h in the following file. Link: https://lore.kernel.org/r/72ab68466d1d22846f47ac058e332bbe27ce188b.1642960861.git.leonro@nvidia.com Signed-off-by: Leon Romanovsky <leonro@nvidia.com> Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
548 lines
13 KiB
C
548 lines
13 KiB
C
/*
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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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#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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#include "qib.h"
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#define QIBFS_MAGIC 0x726a77
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static struct super_block *qib_super;
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#define private2dd(file) (file_inode(file)->i_private)
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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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if (!inode) {
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error = -EPERM;
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goto bail;
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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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inode->i_fop = fops;
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d_instantiate(dentry, inode);
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error = 0;
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bail:
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return error;
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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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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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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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* 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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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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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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/* 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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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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/* 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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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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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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* 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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/* 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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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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/* 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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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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/* 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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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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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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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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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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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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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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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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/* 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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/* 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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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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}
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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);
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if (ret)
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pr_err("create_file(%s/flash) failed: %d\n",
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unit, ret);
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bail:
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return ret;
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}
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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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{
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struct dentry *dir;
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char unit[10];
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snprintf(unit, sizeof(unit), "%u", dd->unit);
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dir = lookup_one_len_unlocked(unit, sb->s_root, strlen(unit));
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if (IS_ERR(dir)) {
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pr_err("Lookup of %s failed\n", unit);
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return PTR_ERR(dir);
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}
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simple_recursive_removal(dir, NULL);
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return 0;
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}
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/*
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* This fills everything in when the fs is mounted, to handle umount/mount
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* after device init. The direct add_cntr_files() call handles adding
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* them from the init code, when the fs is already mounted.
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*/
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static int qibfs_fill_super(struct super_block *sb, struct fs_context *fc)
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{
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struct qib_devdata *dd;
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unsigned long index;
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int ret;
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static const struct tree_descr files[] = {
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[2] = {"driver_stats", &driver_ops[0], S_IRUGO},
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[3] = {"driver_stats_names", &driver_ops[1], S_IRUGO},
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{""},
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};
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ret = simple_fill_super(sb, QIBFS_MAGIC, files);
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if (ret) {
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pr_err("simple_fill_super failed: %d\n", ret);
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goto bail;
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}
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xa_for_each(&qib_dev_table, index, dd) {
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ret = add_cntr_files(sb, dd);
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if (ret)
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goto bail;
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}
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bail:
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return ret;
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}
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static int qibfs_get_tree(struct fs_context *fc)
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{
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int ret = get_tree_single(fc, qibfs_fill_super);
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if (ret == 0)
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qib_super = fc->root->d_sb;
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return ret;
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}
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static const struct fs_context_operations qibfs_context_ops = {
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.get_tree = qibfs_get_tree,
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};
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static int qibfs_init_fs_context(struct fs_context *fc)
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{
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fc->ops = &qibfs_context_ops;
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return 0;
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}
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static void qibfs_kill_super(struct super_block *s)
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{
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kill_litter_super(s);
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qib_super = NULL;
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}
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int qibfs_add(struct qib_devdata *dd)
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{
|
|
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;
|
|
}
|
|
|
|
static struct file_system_type qibfs_fs_type = {
|
|
.owner = THIS_MODULE,
|
|
.name = "ipathfs",
|
|
.init_fs_context = qibfs_init_fs_context,
|
|
.kill_sb = qibfs_kill_super,
|
|
};
|
|
MODULE_ALIAS_FS("ipathfs");
|
|
|
|
int __init qib_init_qibfs(void)
|
|
{
|
|
return register_filesystem(&qibfs_fs_type);
|
|
}
|
|
|
|
int __exit qib_exit_qibfs(void)
|
|
{
|
|
return unregister_filesystem(&qibfs_fs_type);
|
|
}
|