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