2 * Copyright (c) 2006, 2007, 2008, 2009 QLogic Corporation. All rights reserved.
3 * Copyright (c) 2006 PathScale, Inc. All rights reserved.
5 * This software is available to you under a choice of one of two
6 * licenses. You may choose to be licensed under the terms of the GNU
7 * General Public License (GPL) Version 2, available from the file
8 * COPYING in the main directory of this source tree, or the
9 * OpenIB.org BSD license below:
11 * Redistribution and use in source and binary forms, with or
12 * without modification, are permitted provided that the following
15 * - Redistributions of source code must retain the above
16 * copyright notice, this list of conditions and the following
19 * - Redistributions in binary form must reproduce the above
20 * copyright notice, this list of conditions and the following
21 * disclaimer in the documentation and/or other materials
22 * provided with the distribution.
24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
25 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
26 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
27 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
28 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
29 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
30 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
34 #include <linux/module.h>
36 #include <linux/mount.h>
37 #include <linux/pagemap.h>
38 #include <linux/init.h>
39 #include <linux/namei.h>
43 #define QIBFS_MAGIC 0x726a77
45 static struct super_block *qib_super;
47 #define private2dd(file) ((file)->f_dentry->d_inode->i_private)
49 static int qibfs_mknod(struct inode *dir, struct dentry *dentry,
50 int mode, const struct file_operations *fops,
54 struct inode *inode = new_inode(dir->i_sb);
65 inode->i_atime = CURRENT_TIME;
66 inode->i_mtime = inode->i_atime;
67 inode->i_ctime = inode->i_atime;
68 inode->i_private = data;
69 if ((mode & S_IFMT) == S_IFDIR) {
70 inode->i_op = &simple_dir_inode_operations;
77 d_instantiate(dentry, inode);
84 static int create_file(const char *name, mode_t mode,
85 struct dentry *parent, struct dentry **dentry,
86 const struct file_operations *fops, void *data)
91 mutex_lock(&parent->d_inode->i_mutex);
92 *dentry = lookup_one_len(name, parent, strlen(name));
94 error = qibfs_mknod(parent->d_inode, *dentry,
97 error = PTR_ERR(*dentry);
98 mutex_unlock(&parent->d_inode->i_mutex);
103 static ssize_t driver_stats_read(struct file *file, char __user *buf,
104 size_t count, loff_t *ppos)
106 return simple_read_from_buffer(buf, count, ppos, &qib_stats,
111 * driver stats field names, one line per stat, single string. Used by
112 * programs like ipathstats to print the stats in a way which works for
113 * different versions of drivers, without changing program source.
114 * if qlogic_ib_stats changes, this needs to change. Names need to be
115 * 12 chars or less (w/o newline), for proper display by ipathstats utility.
117 static const char qib_statnames[] =
130 static ssize_t driver_names_read(struct file *file, char __user *buf,
131 size_t count, loff_t *ppos)
133 return simple_read_from_buffer(buf, count, ppos, qib_statnames,
134 sizeof qib_statnames - 1); /* no null */
137 static const struct file_operations driver_ops[] = {
138 { .read = driver_stats_read, .llseek = generic_file_llseek, },
139 { .read = driver_names_read, .llseek = generic_file_llseek, },
142 /* read the per-device counters */
143 static ssize_t dev_counters_read(struct file *file, char __user *buf,
144 size_t count, loff_t *ppos)
148 struct qib_devdata *dd = private2dd(file);
150 avail = dd->f_read_cntrs(dd, *ppos, NULL, &counters);
151 return simple_read_from_buffer(buf, count, ppos, counters, avail);
154 /* read the per-device counters */
155 static ssize_t dev_names_read(struct file *file, char __user *buf,
156 size_t count, loff_t *ppos)
160 struct qib_devdata *dd = private2dd(file);
162 avail = dd->f_read_cntrs(dd, *ppos, &names, NULL);
163 return simple_read_from_buffer(buf, count, ppos, names, avail);
166 static const struct file_operations cntr_ops[] = {
167 { .read = dev_counters_read, .llseek = generic_file_llseek, },
168 { .read = dev_names_read, .llseek = generic_file_llseek, },
172 * Could use file->f_dentry->d_inode->i_ino to figure out which file,
173 * instead of separate routine for each, but for now, this works...
176 /* read the per-port names (same for each port) */
177 static ssize_t portnames_read(struct file *file, char __user *buf,
178 size_t count, loff_t *ppos)
182 struct qib_devdata *dd = private2dd(file);
184 avail = dd->f_read_portcntrs(dd, *ppos, 0, &names, NULL);
185 return simple_read_from_buffer(buf, count, ppos, names, avail);
188 /* read the per-port counters for port 1 (pidx 0) */
189 static ssize_t portcntrs_1_read(struct file *file, char __user *buf,
190 size_t count, loff_t *ppos)
194 struct qib_devdata *dd = private2dd(file);
196 avail = dd->f_read_portcntrs(dd, *ppos, 0, NULL, &counters);
197 return simple_read_from_buffer(buf, count, ppos, counters, avail);
200 /* read the per-port counters for port 2 (pidx 1) */
201 static ssize_t portcntrs_2_read(struct file *file, char __user *buf,
202 size_t count, loff_t *ppos)
206 struct qib_devdata *dd = private2dd(file);
208 avail = dd->f_read_portcntrs(dd, *ppos, 1, NULL, &counters);
209 return simple_read_from_buffer(buf, count, ppos, counters, avail);
212 static const struct file_operations portcntr_ops[] = {
213 { .read = portnames_read, .llseek = generic_file_llseek, },
214 { .read = portcntrs_1_read, .llseek = generic_file_llseek, },
215 { .read = portcntrs_2_read, .llseek = generic_file_llseek, },
219 * read the per-port QSFP data for port 1 (pidx 0)
221 static ssize_t qsfp_1_read(struct file *file, char __user *buf,
222 size_t count, loff_t *ppos)
224 struct qib_devdata *dd = private2dd(file);
228 tmp = kmalloc(PAGE_SIZE, GFP_KERNEL);
232 ret = qib_qsfp_dump(dd->pport, tmp, PAGE_SIZE);
234 ret = simple_read_from_buffer(buf, count, ppos, tmp, ret);
240 * read the per-port QSFP data for port 2 (pidx 1)
242 static ssize_t qsfp_2_read(struct file *file, char __user *buf,
243 size_t count, loff_t *ppos)
245 struct qib_devdata *dd = private2dd(file);
249 if (dd->num_pports < 2)
252 tmp = kmalloc(PAGE_SIZE, GFP_KERNEL);
256 ret = qib_qsfp_dump(dd->pport + 1, tmp, PAGE_SIZE);
258 ret = simple_read_from_buffer(buf, count, ppos, tmp, ret);
263 static const struct file_operations qsfp_ops[] = {
264 { .read = qsfp_1_read, .llseek = generic_file_llseek, },
265 { .read = qsfp_2_read, .llseek = generic_file_llseek, },
268 static ssize_t flash_read(struct file *file, char __user *buf,
269 size_t count, loff_t *ppos)
271 struct qib_devdata *dd;
283 if (pos >= sizeof(struct qib_flash)) {
288 if (count > sizeof(struct qib_flash) - pos)
289 count = sizeof(struct qib_flash) - pos;
291 tmp = kmalloc(count, GFP_KERNEL);
297 dd = private2dd(file);
298 if (qib_eeprom_read(dd, pos, tmp, count)) {
299 qib_dev_err(dd, "failed to read from flash\n");
304 if (copy_to_user(buf, tmp, count)) {
319 static ssize_t flash_write(struct file *file, const char __user *buf,
320 size_t count, loff_t *ppos)
322 struct qib_devdata *dd;
334 if (count != sizeof(struct qib_flash)) {
339 tmp = kmalloc(count, GFP_KERNEL);
345 if (copy_from_user(tmp, buf, count)) {
350 dd = private2dd(file);
351 if (qib_eeprom_write(dd, pos, tmp, count)) {
353 qib_dev_err(dd, "failed to write to flash\n");
367 static const struct file_operations flash_ops = {
369 .write = flash_write,
372 static int add_cntr_files(struct super_block *sb, struct qib_devdata *dd)
374 struct dentry *dir, *tmp;
378 /* create the per-unit directory */
379 snprintf(unit, sizeof unit, "%u", dd->unit);
380 ret = create_file(unit, S_IFDIR|S_IRUGO|S_IXUGO, sb->s_root, &dir,
381 &simple_dir_operations, dd);
383 printk(KERN_ERR "create_file(%s) failed: %d\n", unit, ret);
387 /* create the files in the new directory */
388 ret = create_file("counters", S_IFREG|S_IRUGO, dir, &tmp,
391 printk(KERN_ERR "create_file(%s/counters) failed: %d\n",
395 ret = create_file("counter_names", S_IFREG|S_IRUGO, dir, &tmp,
398 printk(KERN_ERR "create_file(%s/counter_names) failed: %d\n",
402 ret = create_file("portcounter_names", S_IFREG|S_IRUGO, dir, &tmp,
403 &portcntr_ops[0], dd);
405 printk(KERN_ERR "create_file(%s/%s) failed: %d\n",
406 unit, "portcounter_names", ret);
409 for (i = 1; i <= dd->num_pports; i++) {
412 sprintf(fname, "port%dcounters", i);
413 /* create the files in the new directory */
414 ret = create_file(fname, S_IFREG|S_IRUGO, dir, &tmp,
415 &portcntr_ops[i], dd);
417 printk(KERN_ERR "create_file(%s/%s) failed: %d\n",
421 if (!(dd->flags & QIB_HAS_QSFP))
423 sprintf(fname, "qsfp%d", i);
424 ret = create_file(fname, S_IFREG|S_IRUGO, dir, &tmp,
425 &qsfp_ops[i - 1], dd);
427 printk(KERN_ERR "create_file(%s/%s) failed: %d\n",
433 ret = create_file("flash", S_IFREG|S_IWUSR|S_IRUGO, dir, &tmp,
436 printk(KERN_ERR "create_file(%s/flash) failed: %d\n",
442 static int remove_file(struct dentry *parent, char *name)
447 tmp = lookup_one_len(name, parent, strlen(name));
454 spin_lock(&dcache_lock);
455 spin_lock(&tmp->d_lock);
456 if (!(d_unhashed(tmp) && tmp->d_inode)) {
459 spin_unlock(&tmp->d_lock);
460 spin_unlock(&dcache_lock);
461 simple_unlink(parent->d_inode, tmp);
463 spin_unlock(&tmp->d_lock);
464 spin_unlock(&dcache_lock);
470 * We don't expect clients to care about the return value, but
471 * it's there if they need it.
476 static int remove_device_files(struct super_block *sb,
477 struct qib_devdata *dd)
479 struct dentry *dir, *root;
483 root = dget(sb->s_root);
484 mutex_lock(&root->d_inode->i_mutex);
485 snprintf(unit, sizeof unit, "%u", dd->unit);
486 dir = lookup_one_len(unit, root, strlen(unit));
490 printk(KERN_ERR "Lookup of %s failed\n", unit);
494 remove_file(dir, "counters");
495 remove_file(dir, "counter_names");
496 remove_file(dir, "portcounter_names");
497 for (i = 0; i < dd->num_pports; i++) {
500 sprintf(fname, "port%dcounters", i + 1);
501 remove_file(dir, fname);
502 if (dd->flags & QIB_HAS_QSFP) {
503 sprintf(fname, "qsfp%d", i + 1);
504 remove_file(dir, fname);
507 remove_file(dir, "flash");
509 ret = simple_rmdir(root->d_inode, dir);
512 mutex_unlock(&root->d_inode->i_mutex);
518 * This fills everything in when the fs is mounted, to handle umount/mount
519 * after device init. The direct add_cntr_files() call handles adding
520 * them from the init code, when the fs is already mounted.
522 static int qibfs_fill_super(struct super_block *sb, void *data, int silent)
524 struct qib_devdata *dd, *tmp;
528 static struct tree_descr files[] = {
529 [2] = {"driver_stats", &driver_ops[0], S_IRUGO},
530 [3] = {"driver_stats_names", &driver_ops[1], S_IRUGO},
534 ret = simple_fill_super(sb, QIBFS_MAGIC, files);
536 printk(KERN_ERR "simple_fill_super failed: %d\n", ret);
540 spin_lock_irqsave(&qib_devs_lock, flags);
542 list_for_each_entry_safe(dd, tmp, &qib_dev_list, list) {
543 spin_unlock_irqrestore(&qib_devs_lock, flags);
544 ret = add_cntr_files(sb, dd);
547 spin_lock_irqsave(&qib_devs_lock, flags);
550 spin_unlock_irqrestore(&qib_devs_lock, flags);
556 static int qibfs_get_sb(struct file_system_type *fs_type, int flags,
557 const char *dev_name, void *data, struct vfsmount *mnt)
559 int ret = get_sb_single(fs_type, flags, data,
560 qibfs_fill_super, mnt);
562 qib_super = mnt->mnt_sb;
566 static void qibfs_kill_super(struct super_block *s)
568 kill_litter_super(s);
572 int qibfs_add(struct qib_devdata *dd)
577 * On first unit initialized, qib_super will not yet exist
578 * because nobody has yet tried to mount the filesystem, so
579 * we can't consider that to be an error; if an error occurs
580 * during the mount, that will get a complaint, so this is OK.
581 * add_cntr_files() for all units is done at mount from
582 * qibfs_fill_super(), so one way or another, everything works.
584 if (qib_super == NULL)
587 ret = add_cntr_files(qib_super, dd);
591 int qibfs_remove(struct qib_devdata *dd)
596 ret = remove_device_files(qib_super, dd);
601 static struct file_system_type qibfs_fs_type = {
602 .owner = THIS_MODULE,
604 .get_sb = qibfs_get_sb,
605 .kill_sb = qibfs_kill_super,
608 int __init qib_init_qibfs(void)
610 return register_filesystem(&qibfs_fs_type);
613 int __exit qib_exit_qibfs(void)
615 return unregister_filesystem(&qibfs_fs_type);