2 * Copyright (c) 2012 Intel Corporation. All rights reserved.
3 * Copyright (c) 2006 - 2012 QLogic Corporation. All rights reserved.
4 * Copyright (c) 2006 PathScale, Inc. All rights reserved.
6 * This software is available to you under a choice of one of two
7 * licenses. You may choose to be licensed under the terms of the GNU
8 * General Public License (GPL) Version 2, available from the file
9 * COPYING in the main directory of this source tree, or the
10 * OpenIB.org BSD license below:
12 * Redistribution and use in source and binary forms, with or
13 * without modification, are permitted provided that the following
16 * - Redistributions of source code must retain the above
17 * copyright notice, this list of conditions and the following
20 * - Redistributions in binary form must reproduce the above
21 * copyright notice, this list of conditions and the following
22 * disclaimer in the documentation and/or other materials
23 * provided with the distribution.
25 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
26 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
27 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
28 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
29 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
30 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
31 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
35 #include <linux/module.h>
37 #include <linux/mount.h>
38 #include <linux/pagemap.h>
39 #include <linux/init.h>
40 #include <linux/namei.h>
44 #define QIBFS_MAGIC 0x726a77
46 static struct super_block *qib_super;
48 #define private2dd(file) (file_inode(file)->i_private)
50 static int qibfs_mknod(struct inode *dir, struct dentry *dentry,
51 umode_t mode, const struct file_operations *fops,
55 struct inode *inode = new_inode(dir->i_sb);
62 inode->i_ino = get_next_ino();
64 inode->i_uid = GLOBAL_ROOT_UID;
65 inode->i_gid = GLOBAL_ROOT_GID;
67 inode->i_atime = CURRENT_TIME;
68 inode->i_mtime = inode->i_atime;
69 inode->i_ctime = inode->i_atime;
70 inode->i_private = data;
72 inode->i_op = &simple_dir_inode_operations;
79 d_instantiate(dentry, inode);
86 static int create_file(const char *name, umode_t mode,
87 struct dentry *parent, struct dentry **dentry,
88 const struct file_operations *fops, void *data)
92 inode_lock(d_inode(parent));
93 *dentry = lookup_one_len(name, parent, strlen(name));
95 error = qibfs_mknod(d_inode(parent), *dentry,
98 error = PTR_ERR(*dentry);
99 inode_unlock(d_inode(parent));
104 static ssize_t driver_stats_read(struct file *file, char __user *buf,
105 size_t count, loff_t *ppos)
107 qib_stats.sps_ints = qib_sps_ints();
108 return simple_read_from_buffer(buf, count, ppos, &qib_stats,
113 * driver stats field names, one line per stat, single string. Used by
114 * programs like ipathstats to print the stats in a way which works for
115 * different versions of drivers, without changing program source.
116 * if qlogic_ib_stats changes, this needs to change. Names need to be
117 * 12 chars or less (w/o newline), for proper display by ipathstats utility.
119 static const char qib_statnames[] =
132 static ssize_t driver_names_read(struct file *file, char __user *buf,
133 size_t count, loff_t *ppos)
135 return simple_read_from_buffer(buf, count, ppos, qib_statnames,
136 sizeof(qib_statnames) - 1); /* no null */
139 static const struct file_operations driver_ops[] = {
140 { .read = driver_stats_read, .llseek = generic_file_llseek, },
141 { .read = driver_names_read, .llseek = generic_file_llseek, },
144 /* read the per-device counters */
145 static ssize_t dev_counters_read(struct file *file, char __user *buf,
146 size_t count, loff_t *ppos)
150 struct qib_devdata *dd = private2dd(file);
152 avail = dd->f_read_cntrs(dd, *ppos, NULL, &counters);
153 return simple_read_from_buffer(buf, count, ppos, counters, avail);
156 /* read the per-device counters */
157 static ssize_t dev_names_read(struct file *file, char __user *buf,
158 size_t count, loff_t *ppos)
162 struct qib_devdata *dd = private2dd(file);
164 avail = dd->f_read_cntrs(dd, *ppos, &names, NULL);
165 return simple_read_from_buffer(buf, count, ppos, names, avail);
168 static const struct file_operations cntr_ops[] = {
169 { .read = dev_counters_read, .llseek = generic_file_llseek, },
170 { .read = dev_names_read, .llseek = generic_file_llseek, },
174 * Could use file_inode(file)->i_ino to figure out which file,
175 * instead of separate routine for each, but for now, this works...
178 /* read the per-port names (same for each port) */
179 static ssize_t portnames_read(struct file *file, char __user *buf,
180 size_t count, loff_t *ppos)
184 struct qib_devdata *dd = private2dd(file);
186 avail = dd->f_read_portcntrs(dd, *ppos, 0, &names, NULL);
187 return simple_read_from_buffer(buf, count, ppos, names, avail);
190 /* read the per-port counters for port 1 (pidx 0) */
191 static ssize_t portcntrs_1_read(struct file *file, char __user *buf,
192 size_t count, loff_t *ppos)
196 struct qib_devdata *dd = private2dd(file);
198 avail = dd->f_read_portcntrs(dd, *ppos, 0, NULL, &counters);
199 return simple_read_from_buffer(buf, count, ppos, counters, avail);
202 /* read the per-port counters for port 2 (pidx 1) */
203 static ssize_t portcntrs_2_read(struct file *file, char __user *buf,
204 size_t count, loff_t *ppos)
208 struct qib_devdata *dd = private2dd(file);
210 avail = dd->f_read_portcntrs(dd, *ppos, 1, NULL, &counters);
211 return simple_read_from_buffer(buf, count, ppos, counters, avail);
214 static const struct file_operations portcntr_ops[] = {
215 { .read = portnames_read, .llseek = generic_file_llseek, },
216 { .read = portcntrs_1_read, .llseek = generic_file_llseek, },
217 { .read = portcntrs_2_read, .llseek = generic_file_llseek, },
221 * read the per-port QSFP data for port 1 (pidx 0)
223 static ssize_t qsfp_1_read(struct file *file, char __user *buf,
224 size_t count, loff_t *ppos)
226 struct qib_devdata *dd = private2dd(file);
230 tmp = kmalloc(PAGE_SIZE, GFP_KERNEL);
234 ret = qib_qsfp_dump(dd->pport, tmp, PAGE_SIZE);
236 ret = simple_read_from_buffer(buf, count, ppos, tmp, ret);
242 * read the per-port QSFP data for port 2 (pidx 1)
244 static ssize_t qsfp_2_read(struct file *file, char __user *buf,
245 size_t count, loff_t *ppos)
247 struct qib_devdata *dd = private2dd(file);
251 if (dd->num_pports < 2)
254 tmp = kmalloc(PAGE_SIZE, GFP_KERNEL);
258 ret = qib_qsfp_dump(dd->pport + 1, tmp, PAGE_SIZE);
260 ret = simple_read_from_buffer(buf, count, ppos, tmp, ret);
265 static const struct file_operations qsfp_ops[] = {
266 { .read = qsfp_1_read, .llseek = generic_file_llseek, },
267 { .read = qsfp_2_read, .llseek = generic_file_llseek, },
270 static ssize_t flash_read(struct file *file, char __user *buf,
271 size_t count, loff_t *ppos)
273 struct qib_devdata *dd;
285 if (pos >= sizeof(struct qib_flash)) {
290 if (count > sizeof(struct qib_flash) - pos)
291 count = sizeof(struct qib_flash) - pos;
293 tmp = kmalloc(count, GFP_KERNEL);
299 dd = private2dd(file);
300 if (qib_eeprom_read(dd, pos, tmp, count)) {
301 qib_dev_err(dd, "failed to read from flash\n");
306 if (copy_to_user(buf, tmp, count)) {
321 static ssize_t flash_write(struct file *file, const char __user *buf,
322 size_t count, loff_t *ppos)
324 struct qib_devdata *dd;
336 if (count != sizeof(struct qib_flash)) {
341 tmp = kmalloc(count, GFP_KERNEL);
347 if (copy_from_user(tmp, buf, count)) {
352 dd = private2dd(file);
353 if (qib_eeprom_write(dd, pos, tmp, count)) {
355 qib_dev_err(dd, "failed to write to flash\n");
369 static const struct file_operations flash_ops = {
371 .write = flash_write,
372 .llseek = default_llseek,
375 static int add_cntr_files(struct super_block *sb, struct qib_devdata *dd)
377 struct dentry *dir, *tmp;
381 /* create the per-unit directory */
382 snprintf(unit, sizeof(unit), "%u", dd->unit);
383 ret = create_file(unit, S_IFDIR|S_IRUGO|S_IXUGO, sb->s_root, &dir,
384 &simple_dir_operations, dd);
386 pr_err("create_file(%s) failed: %d\n", unit, ret);
390 /* create the files in the new directory */
391 ret = create_file("counters", S_IFREG|S_IRUGO, dir, &tmp,
394 pr_err("create_file(%s/counters) failed: %d\n",
398 ret = create_file("counter_names", S_IFREG|S_IRUGO, dir, &tmp,
401 pr_err("create_file(%s/counter_names) failed: %d\n",
405 ret = create_file("portcounter_names", S_IFREG|S_IRUGO, dir, &tmp,
406 &portcntr_ops[0], dd);
408 pr_err("create_file(%s/%s) failed: %d\n",
409 unit, "portcounter_names", ret);
412 for (i = 1; i <= dd->num_pports; i++) {
415 sprintf(fname, "port%dcounters", i);
416 /* create the files in the new directory */
417 ret = create_file(fname, S_IFREG|S_IRUGO, dir, &tmp,
418 &portcntr_ops[i], dd);
420 pr_err("create_file(%s/%s) failed: %d\n",
424 if (!(dd->flags & QIB_HAS_QSFP))
426 sprintf(fname, "qsfp%d", i);
427 ret = create_file(fname, S_IFREG|S_IRUGO, dir, &tmp,
428 &qsfp_ops[i - 1], dd);
430 pr_err("create_file(%s/%s) failed: %d\n",
436 ret = create_file("flash", S_IFREG|S_IWUSR|S_IRUGO, dir, &tmp,
439 pr_err("create_file(%s/flash) failed: %d\n",
445 static int remove_file(struct dentry *parent, char *name)
450 tmp = lookup_one_len(name, parent, strlen(name));
457 spin_lock(&tmp->d_lock);
458 if (simple_positive(tmp)) {
460 spin_unlock(&tmp->d_lock);
461 simple_unlink(d_inode(parent), tmp);
463 spin_unlock(&tmp->d_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 inode_lock(d_inode(root));
485 snprintf(unit, sizeof(unit), "%u", dd->unit);
486 dir = lookup_one_len(unit, root, strlen(unit));
490 pr_err("Lookup of %s failed\n", unit);
494 inode_lock(d_inode(dir));
495 remove_file(dir, "counters");
496 remove_file(dir, "counter_names");
497 remove_file(dir, "portcounter_names");
498 for (i = 0; i < dd->num_pports; i++) {
501 sprintf(fname, "port%dcounters", i + 1);
502 remove_file(dir, fname);
503 if (dd->flags & QIB_HAS_QSFP) {
504 sprintf(fname, "qsfp%d", i + 1);
505 remove_file(dir, fname);
508 remove_file(dir, "flash");
509 inode_unlock(d_inode(dir));
510 ret = simple_rmdir(d_inode(root), dir);
515 inode_unlock(d_inode(root));
521 * This fills everything in when the fs is mounted, to handle umount/mount
522 * after device init. The direct add_cntr_files() call handles adding
523 * them from the init code, when the fs is already mounted.
525 static int qibfs_fill_super(struct super_block *sb, void *data, int silent)
527 struct qib_devdata *dd, *tmp;
531 static struct tree_descr files[] = {
532 [2] = {"driver_stats", &driver_ops[0], S_IRUGO},
533 [3] = {"driver_stats_names", &driver_ops[1], S_IRUGO},
537 ret = simple_fill_super(sb, QIBFS_MAGIC, files);
539 pr_err("simple_fill_super failed: %d\n", ret);
543 spin_lock_irqsave(&qib_devs_lock, flags);
545 list_for_each_entry_safe(dd, tmp, &qib_dev_list, list) {
546 spin_unlock_irqrestore(&qib_devs_lock, flags);
547 ret = add_cntr_files(sb, dd);
550 spin_lock_irqsave(&qib_devs_lock, flags);
553 spin_unlock_irqrestore(&qib_devs_lock, flags);
559 static struct dentry *qibfs_mount(struct file_system_type *fs_type, int flags,
560 const char *dev_name, void *data)
564 ret = mount_single(fs_type, flags, data, qibfs_fill_super);
566 qib_super = ret->d_sb;
570 static void qibfs_kill_super(struct super_block *s)
572 kill_litter_super(s);
576 int qibfs_add(struct qib_devdata *dd)
581 * On first unit initialized, qib_super will not yet exist
582 * because nobody has yet tried to mount the filesystem, so
583 * we can't consider that to be an error; if an error occurs
584 * during the mount, that will get a complaint, so this is OK.
585 * add_cntr_files() for all units is done at mount from
586 * qibfs_fill_super(), so one way or another, everything works.
588 if (qib_super == NULL)
591 ret = add_cntr_files(qib_super, dd);
595 int qibfs_remove(struct qib_devdata *dd)
600 ret = remove_device_files(qib_super, dd);
605 static struct file_system_type qibfs_fs_type = {
606 .owner = THIS_MODULE,
608 .mount = qibfs_mount,
609 .kill_sb = qibfs_kill_super,
611 MODULE_ALIAS_FS("ipathfs");
613 int __init qib_init_qibfs(void)
615 return register_filesystem(&qibfs_fs_type);
618 int __exit qib_exit_qibfs(void)
620 return unregister_filesystem(&qibfs_fs_type);