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);
61 inode->i_ino = get_next_ino();
66 inode->i_atime = CURRENT_TIME;
67 inode->i_mtime = inode->i_atime;
68 inode->i_ctime = inode->i_atime;
69 inode->i_private = data;
70 if ((mode & S_IFMT) == S_IFDIR) {
71 inode->i_op = &simple_dir_inode_operations;
78 d_instantiate(dentry, inode);
85 static int create_file(const char *name, mode_t mode,
86 struct dentry *parent, struct dentry **dentry,
87 const struct file_operations *fops, void *data)
92 mutex_lock(&parent->d_inode->i_mutex);
93 *dentry = lookup_one_len(name, parent, strlen(name));
95 error = qibfs_mknod(parent->d_inode, *dentry,
98 error = PTR_ERR(*dentry);
99 mutex_unlock(&parent->d_inode->i_mutex);
104 static ssize_t driver_stats_read(struct file *file, char __user *buf,
105 size_t count, loff_t *ppos)
107 return simple_read_from_buffer(buf, count, ppos, &qib_stats,
112 * driver stats field names, one line per stat, single string. Used by
113 * programs like ipathstats to print the stats in a way which works for
114 * different versions of drivers, without changing program source.
115 * if qlogic_ib_stats changes, this needs to change. Names need to be
116 * 12 chars or less (w/o newline), for proper display by ipathstats utility.
118 static const char qib_statnames[] =
131 static ssize_t driver_names_read(struct file *file, char __user *buf,
132 size_t count, loff_t *ppos)
134 return simple_read_from_buffer(buf, count, ppos, qib_statnames,
135 sizeof qib_statnames - 1); /* no null */
138 static const struct file_operations driver_ops[] = {
139 { .read = driver_stats_read, .llseek = generic_file_llseek, },
140 { .read = driver_names_read, .llseek = generic_file_llseek, },
143 /* read the per-device counters */
144 static ssize_t dev_counters_read(struct file *file, char __user *buf,
145 size_t count, loff_t *ppos)
149 struct qib_devdata *dd = private2dd(file);
151 avail = dd->f_read_cntrs(dd, *ppos, NULL, &counters);
152 return simple_read_from_buffer(buf, count, ppos, counters, avail);
155 /* read the per-device counters */
156 static ssize_t dev_names_read(struct file *file, char __user *buf,
157 size_t count, loff_t *ppos)
161 struct qib_devdata *dd = private2dd(file);
163 avail = dd->f_read_cntrs(dd, *ppos, &names, NULL);
164 return simple_read_from_buffer(buf, count, ppos, names, avail);
167 static const struct file_operations cntr_ops[] = {
168 { .read = dev_counters_read, .llseek = generic_file_llseek, },
169 { .read = dev_names_read, .llseek = generic_file_llseek, },
173 * Could use file->f_dentry->d_inode->i_ino to figure out which file,
174 * instead of separate routine for each, but for now, this works...
177 /* read the per-port names (same for each port) */
178 static ssize_t portnames_read(struct file *file, char __user *buf,
179 size_t count, loff_t *ppos)
183 struct qib_devdata *dd = private2dd(file);
185 avail = dd->f_read_portcntrs(dd, *ppos, 0, &names, NULL);
186 return simple_read_from_buffer(buf, count, ppos, names, avail);
189 /* read the per-port counters for port 1 (pidx 0) */
190 static ssize_t portcntrs_1_read(struct file *file, char __user *buf,
191 size_t count, loff_t *ppos)
195 struct qib_devdata *dd = private2dd(file);
197 avail = dd->f_read_portcntrs(dd, *ppos, 0, NULL, &counters);
198 return simple_read_from_buffer(buf, count, ppos, counters, avail);
201 /* read the per-port counters for port 2 (pidx 1) */
202 static ssize_t portcntrs_2_read(struct file *file, char __user *buf,
203 size_t count, loff_t *ppos)
207 struct qib_devdata *dd = private2dd(file);
209 avail = dd->f_read_portcntrs(dd, *ppos, 1, NULL, &counters);
210 return simple_read_from_buffer(buf, count, ppos, counters, avail);
213 static const struct file_operations portcntr_ops[] = {
214 { .read = portnames_read, .llseek = generic_file_llseek, },
215 { .read = portcntrs_1_read, .llseek = generic_file_llseek, },
216 { .read = portcntrs_2_read, .llseek = generic_file_llseek, },
220 * read the per-port QSFP data for port 1 (pidx 0)
222 static ssize_t qsfp_1_read(struct file *file, char __user *buf,
223 size_t count, loff_t *ppos)
225 struct qib_devdata *dd = private2dd(file);
229 tmp = kmalloc(PAGE_SIZE, GFP_KERNEL);
233 ret = qib_qsfp_dump(dd->pport, tmp, PAGE_SIZE);
235 ret = simple_read_from_buffer(buf, count, ppos, tmp, ret);
241 * read the per-port QSFP data for port 2 (pidx 1)
243 static ssize_t qsfp_2_read(struct file *file, char __user *buf,
244 size_t count, loff_t *ppos)
246 struct qib_devdata *dd = private2dd(file);
250 if (dd->num_pports < 2)
253 tmp = kmalloc(PAGE_SIZE, GFP_KERNEL);
257 ret = qib_qsfp_dump(dd->pport + 1, tmp, PAGE_SIZE);
259 ret = simple_read_from_buffer(buf, count, ppos, tmp, ret);
264 static const struct file_operations qsfp_ops[] = {
265 { .read = qsfp_1_read, .llseek = generic_file_llseek, },
266 { .read = qsfp_2_read, .llseek = generic_file_llseek, },
269 static ssize_t flash_read(struct file *file, char __user *buf,
270 size_t count, loff_t *ppos)
272 struct qib_devdata *dd;
284 if (pos >= sizeof(struct qib_flash)) {
289 if (count > sizeof(struct qib_flash) - pos)
290 count = sizeof(struct qib_flash) - pos;
292 tmp = kmalloc(count, GFP_KERNEL);
298 dd = private2dd(file);
299 if (qib_eeprom_read(dd, pos, tmp, count)) {
300 qib_dev_err(dd, "failed to read from flash\n");
305 if (copy_to_user(buf, tmp, count)) {
320 static ssize_t flash_write(struct file *file, const char __user *buf,
321 size_t count, loff_t *ppos)
323 struct qib_devdata *dd;
335 if (count != sizeof(struct qib_flash)) {
340 tmp = kmalloc(count, GFP_KERNEL);
346 if (copy_from_user(tmp, buf, count)) {
351 dd = private2dd(file);
352 if (qib_eeprom_write(dd, pos, tmp, count)) {
354 qib_dev_err(dd, "failed to write to flash\n");
368 static const struct file_operations flash_ops = {
370 .write = flash_write,
371 .llseek = default_llseek,
374 static int add_cntr_files(struct super_block *sb, struct qib_devdata *dd)
376 struct dentry *dir, *tmp;
380 /* create the per-unit directory */
381 snprintf(unit, sizeof unit, "%u", dd->unit);
382 ret = create_file(unit, S_IFDIR|S_IRUGO|S_IXUGO, sb->s_root, &dir,
383 &simple_dir_operations, dd);
385 printk(KERN_ERR "create_file(%s) failed: %d\n", unit, ret);
389 /* create the files in the new directory */
390 ret = create_file("counters", S_IFREG|S_IRUGO, dir, &tmp,
393 printk(KERN_ERR "create_file(%s/counters) failed: %d\n",
397 ret = create_file("counter_names", S_IFREG|S_IRUGO, dir, &tmp,
400 printk(KERN_ERR "create_file(%s/counter_names) failed: %d\n",
404 ret = create_file("portcounter_names", S_IFREG|S_IRUGO, dir, &tmp,
405 &portcntr_ops[0], dd);
407 printk(KERN_ERR "create_file(%s/%s) failed: %d\n",
408 unit, "portcounter_names", ret);
411 for (i = 1; i <= dd->num_pports; i++) {
414 sprintf(fname, "port%dcounters", i);
415 /* create the files in the new directory */
416 ret = create_file(fname, S_IFREG|S_IRUGO, dir, &tmp,
417 &portcntr_ops[i], dd);
419 printk(KERN_ERR "create_file(%s/%s) failed: %d\n",
423 if (!(dd->flags & QIB_HAS_QSFP))
425 sprintf(fname, "qsfp%d", i);
426 ret = create_file(fname, S_IFREG|S_IRUGO, dir, &tmp,
427 &qsfp_ops[i - 1], dd);
429 printk(KERN_ERR "create_file(%s/%s) failed: %d\n",
435 ret = create_file("flash", S_IFREG|S_IWUSR|S_IRUGO, dir, &tmp,
438 printk(KERN_ERR "create_file(%s/flash) failed: %d\n",
444 static int remove_file(struct dentry *parent, char *name)
449 tmp = lookup_one_len(name, parent, strlen(name));
456 spin_lock(&tmp->d_lock);
457 if (!(d_unhashed(tmp) && tmp->d_inode)) {
460 spin_unlock(&tmp->d_lock);
461 simple_unlink(parent->d_inode, tmp);
463 spin_unlock(&tmp->d_lock);
469 * We don't expect clients to care about the return value, but
470 * it's there if they need it.
475 static int remove_device_files(struct super_block *sb,
476 struct qib_devdata *dd)
478 struct dentry *dir, *root;
482 root = dget(sb->s_root);
483 mutex_lock(&root->d_inode->i_mutex);
484 snprintf(unit, sizeof unit, "%u", dd->unit);
485 dir = lookup_one_len(unit, root, strlen(unit));
489 printk(KERN_ERR "Lookup of %s failed\n", unit);
493 remove_file(dir, "counters");
494 remove_file(dir, "counter_names");
495 remove_file(dir, "portcounter_names");
496 for (i = 0; i < dd->num_pports; i++) {
499 sprintf(fname, "port%dcounters", i + 1);
500 remove_file(dir, fname);
501 if (dd->flags & QIB_HAS_QSFP) {
502 sprintf(fname, "qsfp%d", i + 1);
503 remove_file(dir, fname);
506 remove_file(dir, "flash");
508 ret = simple_rmdir(root->d_inode, dir);
511 mutex_unlock(&root->d_inode->i_mutex);
517 * This fills everything in when the fs is mounted, to handle umount/mount
518 * after device init. The direct add_cntr_files() call handles adding
519 * them from the init code, when the fs is already mounted.
521 static int qibfs_fill_super(struct super_block *sb, void *data, int silent)
523 struct qib_devdata *dd, *tmp;
527 static struct tree_descr files[] = {
528 [2] = {"driver_stats", &driver_ops[0], S_IRUGO},
529 [3] = {"driver_stats_names", &driver_ops[1], S_IRUGO},
533 ret = simple_fill_super(sb, QIBFS_MAGIC, files);
535 printk(KERN_ERR "simple_fill_super failed: %d\n", ret);
539 spin_lock_irqsave(&qib_devs_lock, flags);
541 list_for_each_entry_safe(dd, tmp, &qib_dev_list, list) {
542 spin_unlock_irqrestore(&qib_devs_lock, flags);
543 ret = add_cntr_files(sb, dd);
546 spin_lock_irqsave(&qib_devs_lock, flags);
549 spin_unlock_irqrestore(&qib_devs_lock, flags);
555 static struct dentry *qibfs_mount(struct file_system_type *fs_type, int flags,
556 const char *dev_name, void *data)
559 ret = mount_single(fs_type, flags, data, qibfs_fill_super);
561 qib_super = ret->d_sb;
565 static void qibfs_kill_super(struct super_block *s)
567 kill_litter_super(s);
571 int qibfs_add(struct qib_devdata *dd)
576 * On first unit initialized, qib_super will not yet exist
577 * because nobody has yet tried to mount the filesystem, so
578 * we can't consider that to be an error; if an error occurs
579 * during the mount, that will get a complaint, so this is OK.
580 * add_cntr_files() for all units is done at mount from
581 * qibfs_fill_super(), so one way or another, everything works.
583 if (qib_super == NULL)
586 ret = add_cntr_files(qib_super, dd);
590 int qibfs_remove(struct qib_devdata *dd)
595 ret = remove_device_files(qib_super, dd);
600 static struct file_system_type qibfs_fs_type = {
601 .owner = THIS_MODULE,
603 .mount = qibfs_mount,
604 .kill_sb = qibfs_kill_super,
607 int __init qib_init_qibfs(void)
609 return register_filesystem(&qibfs_fs_type);
612 int __exit qib_exit_qibfs(void)
614 return unregister_filesystem(&qibfs_fs_type);