diff options
Diffstat (limited to 'drivers/scsi/qla2xxx/qla_dfs.c')
| -rw-r--r-- | drivers/scsi/qla2xxx/qla_dfs.c | 93 |
1 files changed, 93 insertions, 0 deletions
diff --git a/drivers/scsi/qla2xxx/qla_dfs.c b/drivers/scsi/qla2xxx/qla_dfs.c index 85bd0e468d43..777808af5634 100644 --- a/drivers/scsi/qla2xxx/qla_dfs.c +++ b/drivers/scsi/qla2xxx/qla_dfs.c @@ -489,6 +489,99 @@ qla_dfs_naqp_show(struct seq_file *s, void *unused) return 0; } +/* + * Helper macros for setting up debugfs entries. + * _name: The name of the debugfs entry + * _ctx_struct: The context that was passed when creating the debugfs file + * + * QLA_DFS_SETUP_RD could be used when there is only a show function. + * - show function take the name qla_dfs_<sysfs-name>_show + * + * QLA_DFS_SETUP_RW could be used when there are both show and write functions. + * - show function take the name qla_dfs_<sysfs-name>_show + * - write function take the name qla_dfs_<sysfs-name>_write + * + * To have a new debugfs entry, do: + * 1. Create a "struct dentry *" in the appropriate structure in the format + * dfs_<sysfs-name> + * 2. Setup debugfs entries using QLA_DFS_SETUP_RD / QLA_DFS_SETUP_RW + * 3. Create debugfs file in qla2x00_dfs_setup() using QLA_DFS_CREATE_FILE + * or QLA_DFS_ROOT_CREATE_FILE + * 4. Remove debugfs file in qla2x00_dfs_remove() using QLA_DFS_REMOVE_FILE + * or QLA_DFS_ROOT_REMOVE_FILE + * + * Example for creating "TEST" sysfs file: + * 1. struct qla_hw_data { ... struct dentry *dfs_TEST; } + * 2. QLA_DFS_SETUP_RD(TEST, scsi_qla_host_t); + * 3. In qla2x00_dfs_setup(): + * QLA_DFS_CREATE_FILE(ha, TEST, 0600, ha->dfs_dir, vha); + * 4. In qla2x00_dfs_remove(): + * QLA_DFS_REMOVE_FILE(ha, TEST); + */ +#define QLA_DFS_SETUP_RD(_name, _ctx_struct) \ +static int \ +qla_dfs_##_name##_open(struct inode *inode, struct file *file) \ +{ \ + _ctx_struct *__ctx = inode->i_private; \ + \ + return single_open(file, qla_dfs_##_name##_show, __ctx); \ +} \ + \ +static const struct file_operations qla_dfs_##_name##_ops = { \ + .open = qla_dfs_##_name##_open, \ + .read = seq_read, \ + .llseek = seq_lseek, \ + .release = single_release, \ +}; + +#define QLA_DFS_SETUP_RW(_name, _ctx_struct) \ +static int \ +qla_dfs_##_name##_open(struct inode *inode, struct file *file) \ +{ \ + _ctx_struct *__ctx = inode->i_private; \ + \ + return single_open(file, qla_dfs_##_name##_show, __ctx); \ +} \ + \ +static const struct file_operations qla_dfs_##_name##_ops = { \ + .open = qla_dfs_##_name##_open, \ + .read = seq_read, \ + .llseek = seq_lseek, \ + .release = single_release, \ + .write = qla_dfs_##_name##_write, \ +}; + +#define QLA_DFS_ROOT_CREATE_FILE(_name, _perm, _ctx) \ + do { \ + if (!qla_dfs_##_name) \ + qla_dfs_##_name = debugfs_create_file(#_name, \ + _perm, qla2x00_dfs_root, _ctx, \ + &qla_dfs_##_name##_ops); \ + } while (0) + +#define QLA_DFS_ROOT_REMOVE_FILE(_name) \ + do { \ + if (qla_dfs_##_name) { \ + debugfs_remove(qla_dfs_##_name); \ + qla_dfs_##_name = NULL; \ + } \ + } while (0) + +#define QLA_DFS_CREATE_FILE(_struct, _name, _perm, _parent, _ctx) \ + do { \ + (_struct)->dfs_##_name = debugfs_create_file(#_name, \ + _perm, _parent, _ctx, \ + &qla_dfs_##_name##_ops) \ + } while (0) + +#define QLA_DFS_REMOVE_FILE(_struct, _name) \ + do { \ + if ((_struct)->dfs_##_name) { \ + debugfs_remove((_struct)->dfs_##_name); \ + (_struct)->dfs_##_name = NULL; \ + } \ + } while (0) + static int qla_dfs_naqp_open(struct inode *inode, struct file *file) { |