diff options
Diffstat (limited to 'drivers/mtd/ubi/debug.c')
| -rw-r--r-- | drivers/mtd/ubi/debug.c | 269 |
1 files changed, 259 insertions, 10 deletions
diff --git a/drivers/mtd/ubi/debug.c b/drivers/mtd/ubi/debug.c index 2224cbe41dd..ab80c0debac 100644 --- a/drivers/mtd/ubi/debug.c +++ b/drivers/mtd/ubi/debug.c @@ -27,17 +27,9 @@ #ifdef CONFIG_MTD_UBI_DEBUG #include "ubi.h" +#include <linux/debugfs.h> +#include <linux/uaccess.h> #include <linux/module.h> -#include <linux/moduleparam.h> - -unsigned int ubi_chk_flags; -unsigned int ubi_tst_flags; - -module_param_named(debug_chks, ubi_chk_flags, uint, S_IRUGO | S_IWUSR); -module_param_named(debug_tsts, ubi_chk_flags, uint, S_IRUGO | S_IWUSR); - -MODULE_PARM_DESC(debug_chks, "Debug check flags"); -MODULE_PARM_DESC(debug_tsts, "Debug special test flags"); /** * ubi_dbg_dump_ec_hdr - dump an erase counter header. @@ -239,4 +231,261 @@ out: return; } +/** + * ubi_debugging_init_dev - initialize debugging for an UBI device. + * @ubi: UBI device description object + * + * This function initializes debugging-related data for UBI device @ubi. + * Returns zero in case of success and a negative error code in case of + * failure. + */ +int ubi_debugging_init_dev(struct ubi_device *ubi) +{ + ubi->dbg = kzalloc(sizeof(struct ubi_debug_info), GFP_KERNEL); + if (!ubi->dbg) + return -ENOMEM; + + return 0; +} + +/** + * ubi_debugging_exit_dev - free debugging data for an UBI device. + * @ubi: UBI device description object + */ +void ubi_debugging_exit_dev(struct ubi_device *ubi) +{ + kfree(ubi->dbg); +} + +/* + * Root directory for UBI stuff in debugfs. Contains sub-directories which + * contain the stuff specific to particular UBI devices. + */ +static struct dentry *dfs_rootdir; + +/** + * ubi_debugfs_init - create UBI debugfs directory. + * + * Create UBI debugfs directory. Returns zero in case of success and a negative + * error code in case of failure. + */ +int ubi_debugfs_init(void) +{ + dfs_rootdir = debugfs_create_dir("ubi", NULL); + if (IS_ERR_OR_NULL(dfs_rootdir)) { + int err = dfs_rootdir ? -ENODEV : PTR_ERR(dfs_rootdir); + + ubi_err("cannot create \"ubi\" debugfs directory, error %d\n", + err); + return err; + } + + return 0; +} + +/** + * ubi_debugfs_exit - remove UBI debugfs directory. + */ +void ubi_debugfs_exit(void) +{ + debugfs_remove(dfs_rootdir); +} + +/* Read an UBI debugfs file */ +static ssize_t dfs_file_read(struct file *file, char __user *user_buf, + size_t count, loff_t *ppos) +{ + unsigned long ubi_num = (unsigned long)file->private_data; + struct dentry *dent = file->f_path.dentry; + struct ubi_device *ubi; + struct ubi_debug_info *d; + char buf[3]; + int val; + + ubi = ubi_get_device(ubi_num); + if (!ubi) + return -ENODEV; + d = ubi->dbg; + + if (dent == d->dfs_chk_gen) + val = d->chk_gen; + else if (dent == d->dfs_chk_io) + val = d->chk_io; + else if (dent == d->dfs_disable_bgt) + val = d->disable_bgt; + else if (dent == d->dfs_emulate_bitflips) + val = d->emulate_bitflips; + else if (dent == d->dfs_emulate_io_failures) + val = d->emulate_io_failures; + else { + count = -EINVAL; + goto out; + } + + if (val) + buf[0] = '1'; + else + buf[0] = '0'; + buf[1] = '\n'; + buf[2] = 0x00; + + count = simple_read_from_buffer(user_buf, count, ppos, buf, 2); + +out: + ubi_put_device(ubi); + return count; +} + +/* Write an UBI debugfs file */ +static ssize_t dfs_file_write(struct file *file, const char __user *user_buf, + size_t count, loff_t *ppos) +{ + unsigned long ubi_num = (unsigned long)file->private_data; + struct dentry *dent = file->f_path.dentry; + struct ubi_device *ubi; + struct ubi_debug_info *d; + size_t buf_size; + char buf[8]; + int val; + + ubi = ubi_get_device(ubi_num); + if (!ubi) + return -ENODEV; + d = ubi->dbg; + + buf_size = min_t(size_t, count, (sizeof(buf) - 1)); + if (copy_from_user(buf, user_buf, buf_size)) { + count = -EFAULT; + goto out; + } + + if (buf[0] == '1') + val = 1; + else if (buf[0] == '0') + val = 0; + else { + count = -EINVAL; + goto out; + } + + if (dent == d->dfs_chk_gen) + d->chk_gen = val; + else if (dent == d->dfs_chk_io) + d->chk_io = val; + else if (dent == d->dfs_disable_bgt) + d->disable_bgt = val; + else if (dent == d->dfs_emulate_bitflips) + d->emulate_bitflips = val; + else if (dent == d->dfs_emulate_io_failures) + d->emulate_io_failures = val; + else + count = -EINVAL; + +out: + ubi_put_device(ubi); + return count; +} + +static int default_open(struct inode *inode, struct file *file) +{ + if (inode->i_private) + file->private_data = inode->i_private; + + return 0; +} + +/* File operations for all UBI debugfs files */ +static const struct file_operations dfs_fops = { + .read = dfs_file_read, + .write = dfs_file_write, + .open = default_open, + .llseek = no_llseek, + .owner = THIS_MODULE, +}; + +/** + * ubi_debugfs_init_dev - initialize debugfs for an UBI device. + * @ubi: UBI device description object + * + * This function creates all debugfs files for UBI device @ubi. Returns zero in + * case of success and a negative error code in case of failure. + */ +int ubi_debugfs_init_dev(struct ubi_device *ubi) +{ + int err, n; + unsigned long ubi_num = ubi->ubi_num; + const char *fname; + struct dentry *dent; + struct ubi_debug_info *d = ubi->dbg; + + n = snprintf(d->dfs_dir_name, UBI_DFS_DIR_LEN + 1, UBI_DFS_DIR_NAME, + ubi->ubi_num); + if (n == UBI_DFS_DIR_LEN) { + /* The array size is too small */ + fname = UBI_DFS_DIR_NAME; + dent = ERR_PTR(-EINVAL); + goto out; + } + + fname = d->dfs_dir_name; + dent = debugfs_create_dir(fname, dfs_rootdir); + if (IS_ERR_OR_NULL(dent)) + goto out; + d->dfs_dir = dent; + + fname = "chk_gen"; + dent = debugfs_create_file(fname, S_IWUSR, d->dfs_dir, (void *)ubi_num, + &dfs_fops); + if (IS_ERR_OR_NULL(dent)) + goto out_remove; + d->dfs_chk_gen = dent; + + fname = "chk_io"; + dent = debugfs_create_file(fname, S_IWUSR, d->dfs_dir, (void *)ubi_num, + &dfs_fops); + if (IS_ERR_OR_NULL(dent)) + goto out_remove; + d->dfs_chk_io = dent; + + fname = "tst_disable_bgt"; + dent = debugfs_create_file(fname, S_IWUSR, d->dfs_dir, (void *)ubi_num, + &dfs_fops); + if (IS_ERR_OR_NULL(dent)) + goto out_remove; + d->dfs_disable_bgt = dent; + + fname = "tst_emulate_bitflips"; + dent = debugfs_create_file(fname, S_IWUSR, d->dfs_dir, (void *)ubi_num, + &dfs_fops); + if (IS_ERR_OR_NULL(dent)) + goto out_remove; + d->dfs_emulate_bitflips = dent; + + fname = "tst_emulate_io_failures"; + dent = debugfs_create_file(fname, S_IWUSR, d->dfs_dir, (void *)ubi_num, + &dfs_fops); + if (IS_ERR_OR_NULL(dent)) + goto out_remove; + d->dfs_emulate_io_failures = dent; + + return 0; + +out_remove: + debugfs_remove_recursive(d->dfs_dir); +out: + err = dent ? PTR_ERR(dent) : -ENODEV; + ubi_err("cannot create \"%s\" debugfs file or directory, error %d\n", + fname, err); + return err; +} + +/** + * dbg_debug_exit_dev - free all debugfs files corresponding to device @ubi + * @ubi: UBI device description object + */ +void ubi_debugfs_exit_dev(struct ubi_device *ubi) +{ + debugfs_remove_recursive(ubi->dbg->dfs_dir); +} + #endif /* CONFIG_MTD_UBI_DEBUG */ |